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, 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_inet.h" 56 #include "opt_inet6.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/proc.h> 66 #include <sys/random.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_var.h> 74 #include <net/if_types.h> 75 #include <net/bpf.h> 76 #include <net/netisr.h> 77 #include <net/route.h> 78 #include <net/vnet.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 static 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_ATM, NG_IFACE_HOOK_ATM }, 106 { AF_NATM, NG_IFACE_HOOK_NATM }, 107 }; 108 #define NUM_FAMILIES (sizeof(gFamilies) / sizeof(*gFamilies)) 109 110 /* Node private data */ 111 struct ng_iface_private { 112 struct ifnet *ifp; /* Our interface */ 113 int unit; /* Interface unit number */ 114 node_p node; /* Our netgraph node */ 115 hook_p hooks[NUM_FAMILIES]; /* Hook for each address family */ 116 }; 117 typedef struct ng_iface_private *priv_p; 118 119 /* Interface methods */ 120 static void ng_iface_start(struct ifnet *ifp); 121 static int ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data); 122 static int ng_iface_output(struct ifnet *ifp, struct mbuf *m0, 123 const struct sockaddr *dst, struct route *ro); 124 static void ng_iface_bpftap(struct ifnet *ifp, 125 struct mbuf *m, sa_family_t family); 126 static int ng_iface_send(struct ifnet *ifp, struct mbuf *m, 127 sa_family_t sa); 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 static VNET_DEFINE(struct unrhdr *, ng_iface_unit); 211 #define V_ng_iface_unit VNET(ng_iface_unit) 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 INTERFACE STUFF 277 ************************************************************************/ 278 279 /* 280 * Process an ioctl for the virtual interface 281 */ 282 static int 283 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data) 284 { 285 struct ifreq *const ifr = (struct ifreq *) data; 286 int error = 0; 287 288 #ifdef DEBUG 289 ng_iface_print_ioctl(ifp, command, data); 290 #endif 291 switch (command) { 292 293 /* These two are mostly handled at a higher layer */ 294 case SIOCSIFADDR: 295 ifp->if_flags |= IFF_UP; 296 ifp->if_drv_flags |= IFF_DRV_RUNNING; 297 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE); 298 break; 299 case SIOCGIFADDR: 300 break; 301 302 /* Set flags */ 303 case SIOCSIFFLAGS: 304 /* 305 * If the interface is marked up and stopped, then start it. 306 * If it is marked down and running, then stop it. 307 */ 308 if (ifr->ifr_flags & IFF_UP) { 309 if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 310 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE); 311 ifp->if_drv_flags |= IFF_DRV_RUNNING; 312 } 313 } else { 314 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 315 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | 316 IFF_DRV_OACTIVE); 317 } 318 break; 319 320 /* Set the interface MTU */ 321 case SIOCSIFMTU: 322 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX 323 || ifr->ifr_mtu < NG_IFACE_MTU_MIN) 324 error = EINVAL; 325 else 326 ifp->if_mtu = ifr->ifr_mtu; 327 break; 328 329 /* Stuff that's not supported */ 330 case SIOCADDMULTI: 331 case SIOCDELMULTI: 332 error = 0; 333 break; 334 case SIOCSIFPHYS: 335 error = EOPNOTSUPP; 336 break; 337 338 default: 339 error = EINVAL; 340 break; 341 } 342 return (error); 343 } 344 345 /* 346 * This routine is called to deliver a packet out the interface. 347 * We simply look at the address family and relay the packet to 348 * the corresponding hook, if it exists and is connected. 349 */ 350 351 static int 352 ng_iface_output(struct ifnet *ifp, struct mbuf *m, 353 const struct sockaddr *dst, struct route *ro) 354 { 355 struct m_tag *mtag; 356 uint32_t af; 357 int error; 358 359 /* Check interface flags */ 360 if (!((ifp->if_flags & IFF_UP) && 361 (ifp->if_drv_flags & IFF_DRV_RUNNING))) { 362 m_freem(m); 363 return (ENETDOWN); 364 } 365 366 /* Protect from deadly infinite recursion. */ 367 mtag = NULL; 368 while ((mtag = m_tag_locate(m, MTAG_NGIF, MTAG_NGIF_CALLED, mtag))) { 369 if (*(struct ifnet **)(mtag + 1) == ifp) { 370 log(LOG_NOTICE, "Loop detected on %s\n", ifp->if_xname); 371 m_freem(m); 372 return (EDEADLK); 373 } 374 } 375 mtag = m_tag_alloc(MTAG_NGIF, MTAG_NGIF_CALLED, sizeof(struct ifnet *), 376 M_NOWAIT); 377 if (mtag == NULL) { 378 m_freem(m); 379 return (ENOMEM); 380 } 381 *(struct ifnet **)(mtag + 1) = ifp; 382 m_tag_prepend(m, mtag); 383 384 /* BPF writes need to be handled specially. */ 385 if (dst->sa_family == AF_UNSPEC) 386 bcopy(dst->sa_data, &af, sizeof(af)); 387 else 388 af = dst->sa_family; 389 390 /* Berkeley packet filter */ 391 ng_iface_bpftap(ifp, m, af); 392 393 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 394 M_PREPEND(m, sizeof(sa_family_t), M_NOWAIT); 395 if (m == NULL) { 396 if_inc_counter(ifp, IFCOUNTER_OQDROPS, 1); 397 return (ENOBUFS); 398 } 399 *(sa_family_t *)m->m_data = af; 400 error = (ifp->if_transmit)(ifp, m); 401 } else 402 error = ng_iface_send(ifp, m, af); 403 404 return (error); 405 } 406 407 /* 408 * Start method is used only when ALTQ is enabled. 409 */ 410 static void 411 ng_iface_start(struct ifnet *ifp) 412 { 413 struct mbuf *m; 414 sa_family_t sa; 415 416 KASSERT(ALTQ_IS_ENABLED(&ifp->if_snd), ("%s without ALTQ", __func__)); 417 418 for(;;) { 419 IFQ_DRV_DEQUEUE(&ifp->if_snd, m); 420 if (m == NULL) 421 break; 422 sa = *mtod(m, sa_family_t *); 423 m_adj(m, sizeof(sa_family_t)); 424 ng_iface_send(ifp, m, sa); 425 } 426 } 427 428 /* 429 * Flash a packet by the BPF (requires prepending 4 byte AF header) 430 * Note the phoney mbuf; this is OK because BPF treats it read-only. 431 */ 432 static void 433 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family) 434 { 435 KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__)); 436 if (bpf_peers_present(ifp->if_bpf)) { 437 int32_t family4 = (int32_t)family; 438 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m); 439 } 440 } 441 442 /* 443 * This routine does actual delivery of the packet into the 444 * netgraph(4). It is called from ng_iface_start() and 445 * ng_iface_output(). 446 */ 447 static int 448 ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa) 449 { 450 const priv_p priv = (priv_p) ifp->if_softc; 451 const iffam_p iffam = get_iffam_from_af(sa); 452 int error; 453 int len; 454 455 /* Check address family to determine hook (if known) */ 456 if (iffam == NULL) { 457 m_freem(m); 458 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa); 459 return (EAFNOSUPPORT); 460 } 461 462 /* Copy length before the mbuf gets invalidated. */ 463 len = m->m_pkthdr.len; 464 465 /* Send packet. If hook is not connected, mbuf will get freed. */ 466 NG_OUTBOUND_THREAD_REF(); 467 NG_SEND_DATA_ONLY(error, *get_hook_from_iffam(priv, iffam), m); 468 NG_OUTBOUND_THREAD_UNREF(); 469 470 /* Update stats. */ 471 if (error == 0) { 472 if_inc_counter(ifp, IFCOUNTER_OBYTES, len); 473 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 474 } 475 476 return (error); 477 } 478 479 #ifdef DEBUG 480 /* 481 * Display an ioctl to the virtual interface 482 */ 483 484 static void 485 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data) 486 { 487 char *str; 488 489 switch (command & IOC_DIRMASK) { 490 case IOC_VOID: 491 str = "IO"; 492 break; 493 case IOC_OUT: 494 str = "IOR"; 495 break; 496 case IOC_IN: 497 str = "IOW"; 498 break; 499 case IOC_INOUT: 500 str = "IORW"; 501 break; 502 default: 503 str = "IO??"; 504 } 505 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n", 506 ifp->if_xname, 507 str, 508 IOCGROUP(command), 509 command & 0xff, 510 IOCPARM_LEN(command)); 511 } 512 #endif /* DEBUG */ 513 514 /************************************************************************ 515 NETGRAPH NODE STUFF 516 ************************************************************************/ 517 518 /* 519 * Constructor for a node 520 */ 521 static int 522 ng_iface_constructor(node_p node) 523 { 524 struct ifnet *ifp; 525 priv_p priv; 526 527 /* Allocate node and interface private structures */ 528 priv = malloc(sizeof(*priv), M_NETGRAPH_IFACE, M_WAITOK | M_ZERO); 529 ifp = if_alloc(IFT_PROPVIRTUAL); 530 if (ifp == NULL) { 531 free(priv, M_NETGRAPH_IFACE); 532 return (ENOMEM); 533 } 534 535 /* Link them together */ 536 ifp->if_softc = priv; 537 priv->ifp = ifp; 538 539 /* Get an interface unit number */ 540 priv->unit = alloc_unr(V_ng_iface_unit); 541 542 /* Link together node and private info */ 543 NG_NODE_SET_PRIVATE(node, priv); 544 priv->node = node; 545 546 /* Initialize interface structure */ 547 if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit); 548 ifp->if_output = ng_iface_output; 549 ifp->if_start = ng_iface_start; 550 ifp->if_ioctl = ng_iface_ioctl; 551 ifp->if_mtu = NG_IFACE_MTU_DEFAULT; 552 ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST); 553 ifp->if_type = IFT_PROPVIRTUAL; /* XXX */ 554 ifp->if_addrlen = 0; /* XXX */ 555 ifp->if_hdrlen = 0; /* XXX */ 556 ifp->if_baudrate = 64000; /* XXX */ 557 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 558 ifp->if_snd.ifq_drv_maxlen = ifqmaxlen; 559 IFQ_SET_READY(&ifp->if_snd); 560 561 /* Give this node the same name as the interface (if possible) */ 562 if (ng_name_node(node, ifp->if_xname) != 0) 563 log(LOG_WARNING, "%s: can't acquire netgraph name\n", 564 ifp->if_xname); 565 566 /* Attach the interface */ 567 if_attach(ifp); 568 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t)); 569 570 /* Done */ 571 return (0); 572 } 573 574 /* 575 * Give our ok for a hook to be added 576 */ 577 static int 578 ng_iface_newhook(node_p node, hook_p hook, const char *name) 579 { 580 const iffam_p iffam = get_iffam_from_name(name); 581 hook_p *hookptr; 582 583 if (iffam == NULL) 584 return (EPFNOSUPPORT); 585 hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam); 586 if (*hookptr != NULL) 587 return (EISCONN); 588 *hookptr = hook; 589 NG_HOOK_HI_STACK(hook); 590 NG_HOOK_SET_TO_INBOUND(hook); 591 return (0); 592 } 593 594 /* 595 * Receive a control message 596 */ 597 static int 598 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook) 599 { 600 const priv_p priv = NG_NODE_PRIVATE(node); 601 struct ifnet *const ifp = priv->ifp; 602 struct ng_mesg *resp = NULL; 603 int error = 0; 604 struct ng_mesg *msg; 605 606 NGI_GET_MSG(item, msg); 607 switch (msg->header.typecookie) { 608 case NGM_IFACE_COOKIE: 609 switch (msg->header.cmd) { 610 case NGM_IFACE_GET_IFNAME: 611 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT); 612 if (resp == NULL) { 613 error = ENOMEM; 614 break; 615 } 616 strlcpy(resp->data, ifp->if_xname, IFNAMSIZ); 617 break; 618 619 case NGM_IFACE_POINT2POINT: 620 case NGM_IFACE_BROADCAST: 621 { 622 623 /* Deny request if interface is UP */ 624 if ((ifp->if_flags & IFF_UP) != 0) 625 return (EBUSY); 626 627 /* Change flags */ 628 switch (msg->header.cmd) { 629 case NGM_IFACE_POINT2POINT: 630 ifp->if_flags |= IFF_POINTOPOINT; 631 ifp->if_flags &= ~IFF_BROADCAST; 632 break; 633 case NGM_IFACE_BROADCAST: 634 ifp->if_flags &= ~IFF_POINTOPOINT; 635 ifp->if_flags |= IFF_BROADCAST; 636 break; 637 } 638 break; 639 } 640 641 case NGM_IFACE_GET_IFINDEX: 642 NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT); 643 if (resp == NULL) { 644 error = ENOMEM; 645 break; 646 } 647 *((uint32_t *)resp->data) = priv->ifp->if_index; 648 break; 649 650 default: 651 error = EINVAL; 652 break; 653 } 654 break; 655 case NGM_CISCO_COOKIE: 656 switch (msg->header.cmd) { 657 case NGM_CISCO_GET_IPADDR: /* we understand this too */ 658 { 659 struct ifaddr *ifa; 660 661 /* Return the first configured IP address */ 662 if_addr_rlock(ifp); 663 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 664 struct ng_cisco_ipaddr *ips; 665 666 if (ifa->ifa_addr->sa_family != AF_INET) 667 continue; 668 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT); 669 if (resp == NULL) { 670 error = ENOMEM; 671 break; 672 } 673 ips = (struct ng_cisco_ipaddr *)resp->data; 674 ips->ipaddr = ((struct sockaddr_in *) 675 ifa->ifa_addr)->sin_addr; 676 ips->netmask = ((struct sockaddr_in *) 677 ifa->ifa_netmask)->sin_addr; 678 break; 679 } 680 if_addr_runlock(ifp); 681 682 /* No IP addresses on this interface? */ 683 if (ifa == NULL) 684 error = EADDRNOTAVAIL; 685 break; 686 } 687 default: 688 error = EINVAL; 689 break; 690 } 691 break; 692 case NGM_FLOW_COOKIE: 693 switch (msg->header.cmd) { 694 case NGM_LINK_IS_UP: 695 ifp->if_drv_flags |= IFF_DRV_RUNNING; 696 break; 697 case NGM_LINK_IS_DOWN: 698 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 699 break; 700 default: 701 break; 702 } 703 break; 704 default: 705 error = EINVAL; 706 break; 707 } 708 NG_RESPOND_MSG(error, node, item, resp); 709 NG_FREE_MSG(msg); 710 return (error); 711 } 712 713 /* 714 * Recive data from a hook. Pass the packet to the correct input routine. 715 */ 716 static int 717 ng_iface_rcvdata(hook_p hook, item_p item) 718 { 719 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 720 const iffam_p iffam = get_iffam_from_hook(priv, hook); 721 struct ifnet *const ifp = priv->ifp; 722 struct mbuf *m; 723 int isr; 724 725 NGI_GET_M(item, m); 726 NG_FREE_ITEM(item); 727 /* Sanity checks */ 728 KASSERT(iffam != NULL, ("%s: iffam", __func__)); 729 M_ASSERTPKTHDR(m); 730 if ((ifp->if_flags & IFF_UP) == 0) { 731 NG_FREE_M(m); 732 return (ENETDOWN); 733 } 734 735 /* Update interface stats */ 736 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 737 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 738 739 /* Note receiving interface */ 740 m->m_pkthdr.rcvif = ifp; 741 742 /* Berkeley packet filter */ 743 ng_iface_bpftap(ifp, m, iffam->family); 744 745 /* Send packet */ 746 switch (iffam->family) { 747 #ifdef INET 748 case AF_INET: 749 isr = NETISR_IP; 750 break; 751 #endif 752 #ifdef INET6 753 case AF_INET6: 754 isr = NETISR_IPV6; 755 break; 756 #endif 757 default: 758 m_freem(m); 759 return (EAFNOSUPPORT); 760 } 761 random_harvest(&(m->m_data), 12, 2, RANDOM_NET_NG); 762 M_SETFIB(m, ifp->if_fib); 763 netisr_dispatch(isr, m); 764 return (0); 765 } 766 767 /* 768 * Shutdown and remove the node and its associated interface. 769 */ 770 static int 771 ng_iface_shutdown(node_p node) 772 { 773 const priv_p priv = NG_NODE_PRIVATE(node); 774 775 /* 776 * The ifnet may be in a different vnet than the netgraph node, 777 * hence we have to change the current vnet context here. 778 */ 779 CURVNET_SET_QUIET(priv->ifp->if_vnet); 780 bpfdetach(priv->ifp); 781 if_detach(priv->ifp); 782 if_free(priv->ifp); 783 CURVNET_RESTORE(); 784 priv->ifp = NULL; 785 free_unr(V_ng_iface_unit, priv->unit); 786 free(priv, M_NETGRAPH_IFACE); 787 NG_NODE_SET_PRIVATE(node, NULL); 788 NG_NODE_UNREF(node); 789 return (0); 790 } 791 792 /* 793 * Hook disconnection. Note that we do *not* shutdown when all 794 * hooks have been disconnected. 795 */ 796 static int 797 ng_iface_disconnect(hook_p hook) 798 { 799 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 800 const iffam_p iffam = get_iffam_from_hook(priv, hook); 801 802 if (iffam == NULL) 803 panic("%s", __func__); 804 *get_hook_from_iffam(priv, iffam) = NULL; 805 return (0); 806 } 807 808 /* 809 * Handle loading and unloading for this node type. 810 */ 811 static int 812 ng_iface_mod_event(module_t mod, int event, void *data) 813 { 814 int error = 0; 815 816 switch (event) { 817 case MOD_LOAD: 818 case MOD_UNLOAD: 819 break; 820 default: 821 error = EOPNOTSUPP; 822 break; 823 } 824 return (error); 825 } 826 827 static void 828 vnet_ng_iface_init(const void *unused) 829 { 830 831 V_ng_iface_unit = new_unrhdr(0, 0xffff, NULL); 832 } 833 VNET_SYSINIT(vnet_ng_iface_init, SI_SUB_PSEUDO, SI_ORDER_ANY, 834 vnet_ng_iface_init, NULL); 835 836 static void 837 vnet_ng_iface_uninit(const void *unused) 838 { 839 840 delete_unrhdr(V_ng_iface_unit); 841 } 842 VNET_SYSUNINIT(vnet_ng_iface_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY, 843 vnet_ng_iface_uninit, NULL); 844