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sys/netgraph/ng_iface.c
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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/random.h> 68 #include <sys/sockio.h> 69 #include <sys/socket.h> 70 #include <sys/syslog.h> 71 #include <sys/libkern.h> 72 73 #include <net/if.h> 74 #include <net/if_types.h> 75 #include <net/bpf.h> 76 #include <net/netisr.h> 77 78 #include <netinet/in.h> 79 80 #include <netgraph/ng_message.h> 81 #include <netgraph/netgraph.h> 82 #include <netgraph/ng_parse.h> 83 #include <netgraph/ng_iface.h> 84 #include <netgraph/ng_cisco.h> 85 86 #ifdef NG_SEPARATE_MALLOC 87 MALLOC_DEFINE(M_NETGRAPH_IFACE, "netgraph_iface", "netgraph iface node "); 88 #else 89 #define M_NETGRAPH_IFACE M_NETGRAPH 90 #endif 91 92 /* This struct describes one address family */ 93 struct iffam { 94 sa_family_t family; /* Address family */ 95 const char *hookname; /* Name for hook */ 96 }; 97 typedef const struct iffam *iffam_p; 98 99 /* List of address families supported by our interface */ 100 const static struct iffam gFamilies[] = { 101 { AF_INET, NG_IFACE_HOOK_INET }, 102 { AF_INET6, NG_IFACE_HOOK_INET6 }, 103 { AF_APPLETALK, NG_IFACE_HOOK_ATALK }, 104 { AF_IPX, NG_IFACE_HOOK_IPX }, 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 struct sockaddr *dst, struct rtentry *rt0); 124 static void ng_iface_bpftap(struct ifnet *ifp, 125 struct mbuf *m, sa_family_t family); 126 #ifdef DEBUG 127 static void ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data); 128 #endif 129 130 /* Netgraph methods */ 131 static int ng_iface_mod_event(module_t, int, void *); 132 static ng_constructor_t ng_iface_constructor; 133 static ng_rcvmsg_t ng_iface_rcvmsg; 134 static ng_shutdown_t ng_iface_shutdown; 135 static ng_newhook_t ng_iface_newhook; 136 static ng_rcvdata_t ng_iface_rcvdata; 137 static ng_disconnect_t ng_iface_disconnect; 138 139 /* Helper stuff */ 140 static iffam_p get_iffam_from_af(sa_family_t family); 141 static iffam_p get_iffam_from_hook(priv_p priv, hook_p hook); 142 static iffam_p get_iffam_from_name(const char *name); 143 static hook_p *get_hook_from_iffam(priv_p priv, iffam_p iffam); 144 145 /* Parse type for struct ng_iface_ifname */ 146 static const struct ng_parse_fixedstring_info ng_iface_ifname_info = { 147 NG_IFACE_IFACE_NAME_MAX + 1 148 }; 149 static const struct ng_parse_type ng_iface_ifname_type = { 150 &ng_parse_fixedstring_type, 151 &ng_iface_ifname_info 152 }; 153 154 /* Parse type for struct ng_cisco_ipaddr */ 155 static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[] 156 = NG_CISCO_IPADDR_TYPE_INFO; 157 static const struct ng_parse_type ng_cisco_ipaddr_type = { 158 &ng_parse_struct_type, 159 &ng_cisco_ipaddr_type_fields 160 }; 161 162 /* List of commands and how to convert arguments to/from ASCII */ 163 static const struct ng_cmdlist ng_iface_cmds[] = { 164 { 165 NGM_IFACE_COOKIE, 166 NGM_IFACE_GET_IFNAME, 167 "getifname", 168 NULL, 169 &ng_iface_ifname_type 170 }, 171 { 172 NGM_IFACE_COOKIE, 173 NGM_IFACE_POINT2POINT, 174 "point2point", 175 NULL, 176 NULL 177 }, 178 { 179 NGM_IFACE_COOKIE, 180 NGM_IFACE_BROADCAST, 181 "broadcast", 182 NULL, 183 NULL 184 }, 185 { 186 NGM_CISCO_COOKIE, 187 NGM_CISCO_GET_IPADDR, 188 "getipaddr", 189 NULL, 190 &ng_cisco_ipaddr_type 191 }, 192 { 193 NGM_IFACE_COOKIE, 194 NGM_IFACE_GET_IFINDEX, 195 "getifindex", 196 NULL, 197 &ng_parse_uint32_type 198 }, 199 { 0 } 200 }; 201 202 /* Node type descriptor */ 203 static struct ng_type typestruct = { 204 .version = NG_ABI_VERSION, 205 .name = NG_IFACE_NODE_TYPE, 206 .mod_event = ng_iface_mod_event, 207 .constructor = ng_iface_constructor, 208 .rcvmsg = ng_iface_rcvmsg, 209 .shutdown = ng_iface_shutdown, 210 .newhook = ng_iface_newhook, 211 .rcvdata = ng_iface_rcvdata, 212 .disconnect = ng_iface_disconnect, 213 .cmdlist = ng_iface_cmds, 214 }; 215 NETGRAPH_INIT(iface, &typestruct); 216 217 static struct unrhdr *ng_iface_unit; 218 219 /************************************************************************ 220 HELPER STUFF 221 ************************************************************************/ 222 223 /* 224 * Get the family descriptor from the family ID 225 */ 226 static __inline iffam_p 227 get_iffam_from_af(sa_family_t family) 228 { 229 iffam_p iffam; 230 int k; 231 232 for (k = 0; k < NUM_FAMILIES; k++) { 233 iffam = &gFamilies[k]; 234 if (iffam->family == family) 235 return (iffam); 236 } 237 return (NULL); 238 } 239 240 /* 241 * Get the family descriptor from the hook 242 */ 243 static __inline iffam_p 244 get_iffam_from_hook(priv_p priv, hook_p hook) 245 { 246 int k; 247 248 for (k = 0; k < NUM_FAMILIES; k++) 249 if (priv->hooks[k] == hook) 250 return (&gFamilies[k]); 251 return (NULL); 252 } 253 254 /* 255 * Get the hook from the iffam descriptor 256 */ 257 258 static __inline hook_p * 259 get_hook_from_iffam(priv_p priv, iffam_p iffam) 260 { 261 return (&priv->hooks[iffam - gFamilies]); 262 } 263 264 /* 265 * Get the iffam descriptor from the name 266 */ 267 static __inline iffam_p 268 get_iffam_from_name(const char *name) 269 { 270 iffam_p iffam; 271 int k; 272 273 for (k = 0; k < NUM_FAMILIES; k++) { 274 iffam = &gFamilies[k]; 275 if (!strcmp(iffam->hookname, name)) 276 return (iffam); 277 } 278 return (NULL); 279 } 280 281 /************************************************************************ 282 INTERFACE STUFF 283 ************************************************************************/ 284 285 /* 286 * Process an ioctl for the virtual interface 287 */ 288 static int 289 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data) 290 { 291 struct ifreq *const ifr = (struct ifreq *) data; 292 int s, error = 0; 293 294 #ifdef DEBUG 295 ng_iface_print_ioctl(ifp, command, data); 296 #endif 297 s = splimp(); 298 switch (command) { 299 300 /* These two are mostly handled at a higher layer */ 301 case SIOCSIFADDR: 302 ifp->if_flags |= (IFF_UP | IFF_RUNNING); 303 ifp->if_flags &= ~(IFF_OACTIVE); 304 break; 305 case SIOCGIFADDR: 306 break; 307 308 /* Set flags */ 309 case SIOCSIFFLAGS: 310 /* 311 * If the interface is marked up and stopped, then start it. 312 * If it is marked down and running, then stop it. 313 */ 314 if (ifr->ifr_flags & IFF_UP) { 315 if (!(ifp->if_flags & IFF_RUNNING)) { 316 ifp->if_flags &= ~(IFF_OACTIVE); 317 ifp->if_flags |= IFF_RUNNING; 318 } 319 } else { 320 if (ifp->if_flags & IFF_RUNNING) 321 ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE); 322 } 323 break; 324 325 /* Set the interface MTU */ 326 case SIOCSIFMTU: 327 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX 328 || ifr->ifr_mtu < NG_IFACE_MTU_MIN) 329 error = EINVAL; 330 else 331 ifp->if_mtu = ifr->ifr_mtu; 332 break; 333 334 /* Stuff that's not supported */ 335 case SIOCADDMULTI: 336 case SIOCDELMULTI: 337 error = 0; 338 break; 339 case SIOCSIFPHYS: 340 error = EOPNOTSUPP; 341 break; 342 343 default: 344 error = EINVAL; 345 break; 346 } 347 (void) splx(s); 348 return (error); 349 } 350 351 /* 352 * This routine is called to deliver a packet out the interface. 353 * We simply look at the address family and relay the packet to 354 * the corresponding hook, if it exists and is connected. 355 */ 356 357 static int 358 ng_iface_output(struct ifnet *ifp, struct mbuf *m, 359 struct sockaddr *dst, struct rtentry *rt0) 360 { 361 const priv_p priv = (priv_p) ifp->if_softc; 362 const iffam_p iffam = get_iffam_from_af(dst->sa_family); 363 int len, error = 0; 364 365 /* Check interface flags */ 366 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { 367 m_freem(m); 368 return (ENETDOWN); 369 } 370 371 /* BPF writes need to be handled specially */ 372 if (dst->sa_family == AF_UNSPEC) { 373 if (m->m_len < 4 && (m = m_pullup(m, 4)) == NULL) 374 return (ENOBUFS); 375 dst->sa_family = (sa_family_t)*mtod(m, int32_t *); 376 m->m_data += 4; 377 m->m_len -= 4; 378 m->m_pkthdr.len -= 4; 379 } 380 381 /* Berkeley packet filter */ 382 ng_iface_bpftap(ifp, m, dst->sa_family); 383 384 /* Check address family to determine hook (if known) */ 385 if (iffam == NULL) { 386 m_freem(m); 387 log(LOG_WARNING, "%s: can't handle af%d\n", 388 ifp->if_xname, (int)dst->sa_family); 389 return (EAFNOSUPPORT); 390 } 391 392 /* Copy length before the mbuf gets invalidated */ 393 len = m->m_pkthdr.len; 394 395 /* Send packet; if hook is not connected, mbuf will get freed. */ 396 NG_SEND_DATA_ONLY(error, *get_hook_from_iffam(priv, iffam), m); 397 398 /* Update stats */ 399 if (error == 0) { 400 ifp->if_obytes += len; 401 ifp->if_opackets++; 402 } 403 return (error); 404 } 405 406 /* 407 * This routine should never be called 408 */ 409 410 static void 411 ng_iface_start(struct ifnet *ifp) 412 { 413 if_printf(ifp, "%s called?", __func__); 414 } 415 416 /* 417 * Flash a packet by the BPF (requires prepending 4 byte AF header) 418 * Note the phoney mbuf; this is OK because BPF treats it read-only. 419 */ 420 static void 421 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family) 422 { 423 KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__)); 424 if (ifp->if_bpf != NULL) { 425 int32_t family4 = (int32_t)family; 426 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m); 427 } 428 } 429 430 #ifdef DEBUG 431 /* 432 * Display an ioctl to the virtual interface 433 */ 434 435 static void 436 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data) 437 { 438 char *str; 439 440 switch (command & IOC_DIRMASK) { 441 case IOC_VOID: 442 str = "IO"; 443 break; 444 case IOC_OUT: 445 str = "IOR"; 446 break; 447 case IOC_IN: 448 str = "IOW"; 449 break; 450 case IOC_INOUT: 451 str = "IORW"; 452 break; 453 default: 454 str = "IO??"; 455 } 456 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n", 457 ifp->if_xname, 458 str, 459 IOCGROUP(command), 460 command & 0xff, 461 IOCPARM_LEN(command)); 462 } 463 #endif /* DEBUG */ 464 465 /************************************************************************ 466 NETGRAPH NODE STUFF 467 ************************************************************************/ 468 469 /* 470 * Constructor for a node 471 */ 472 static int 473 ng_iface_constructor(node_p node) 474 { 475 char ifname[NG_IFACE_IFACE_NAME_MAX + 1]; 476 struct ifnet *ifp; 477 priv_p priv; 478 479 /* Allocate node and interface private structures */ 480 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH_IFACE, M_NOWAIT|M_ZERO); 481 if (priv == NULL) 482 return (ENOMEM); 483 MALLOC(ifp, struct ifnet *, sizeof(*ifp), M_NETGRAPH_IFACE, M_NOWAIT|M_ZERO); 484 if (ifp == NULL) { 485 FREE(priv, M_NETGRAPH_IFACE); 486 return (ENOMEM); 487 } 488 489 /* Link them together */ 490 ifp->if_softc = priv; 491 priv->ifp = ifp; 492 493 /* Get an interface unit number */ 494 priv->unit = alloc_unr(ng_iface_unit); 495 496 /* Link together node and private info */ 497 NG_NODE_SET_PRIVATE(node, priv); 498 priv->node = node; 499 500 /* Initialize interface structure */ 501 if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit); 502 ifp->if_output = ng_iface_output; 503 ifp->if_start = ng_iface_start; 504 ifp->if_ioctl = ng_iface_ioctl; 505 ifp->if_watchdog = NULL; 506 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN; 507 ifp->if_mtu = NG_IFACE_MTU_DEFAULT; 508 ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST); 509 ifp->if_type = IFT_PROPVIRTUAL; /* XXX */ 510 ifp->if_addrlen = 0; /* XXX */ 511 ifp->if_hdrlen = 0; /* XXX */ 512 ifp->if_baudrate = 64000; /* XXX */ 513 TAILQ_INIT(&ifp->if_addrhead); 514 515 /* Give this node the same name as the interface (if possible) */ 516 bzero(ifname, sizeof(ifname)); 517 strlcpy(ifname, ifp->if_xname, sizeof(ifname)); 518 if (ng_name_node(node, ifname) != 0) 519 log(LOG_WARNING, "%s: can't acquire netgraph name\n", ifname); 520 521 /* Attach the interface */ 522 if_attach(ifp); 523 bpfattach(ifp, DLT_NULL, sizeof(u_int)); 524 525 /* Done */ 526 return (0); 527 } 528 529 /* 530 * Give our ok for a hook to be added 531 */ 532 static int 533 ng_iface_newhook(node_p node, hook_p hook, const char *name) 534 { 535 const iffam_p iffam = get_iffam_from_name(name); 536 hook_p *hookptr; 537 538 if (iffam == NULL) 539 return (EPFNOSUPPORT); 540 hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam); 541 if (*hookptr != NULL) 542 return (EISCONN); 543 *hookptr = hook; 544 return (0); 545 } 546 547 /* 548 * Receive a control message 549 */ 550 static int 551 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook) 552 { 553 const priv_p priv = NG_NODE_PRIVATE(node); 554 struct ifnet *const ifp = priv->ifp; 555 struct ng_mesg *resp = NULL; 556 int error = 0; 557 struct ng_mesg *msg; 558 559 NGI_GET_MSG(item, msg); 560 switch (msg->header.typecookie) { 561 case NGM_IFACE_COOKIE: 562 switch (msg->header.cmd) { 563 case NGM_IFACE_GET_IFNAME: 564 { 565 struct ng_iface_ifname *arg; 566 567 NG_MKRESPONSE(resp, msg, sizeof(*arg), M_NOWAIT); 568 if (resp == NULL) { 569 error = ENOMEM; 570 break; 571 } 572 arg = (struct ng_iface_ifname *)resp->data; 573 strlcpy(arg->ngif_name, ifp->if_xname, 574 sizeof(arg->ngif_name)); 575 break; 576 } 577 578 case NGM_IFACE_POINT2POINT: 579 case NGM_IFACE_BROADCAST: 580 { 581 582 /* Deny request if interface is UP */ 583 if ((ifp->if_flags & IFF_UP) != 0) 584 return (EBUSY); 585 586 /* Change flags */ 587 switch (msg->header.cmd) { 588 case NGM_IFACE_POINT2POINT: 589 ifp->if_flags |= IFF_POINTOPOINT; 590 ifp->if_flags &= ~IFF_BROADCAST; 591 break; 592 case NGM_IFACE_BROADCAST: 593 ifp->if_flags &= ~IFF_POINTOPOINT; 594 ifp->if_flags |= IFF_BROADCAST; 595 break; 596 } 597 break; 598 } 599 600 case NGM_IFACE_GET_IFINDEX: 601 NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT); 602 if (resp == NULL) { 603 error = ENOMEM; 604 break; 605 } 606 *((uint32_t *)resp->data) = priv->ifp->if_index; 607 break; 608 609 default: 610 error = EINVAL; 611 break; 612 } 613 break; 614 case NGM_CISCO_COOKIE: 615 switch (msg->header.cmd) { 616 case NGM_CISCO_GET_IPADDR: /* we understand this too */ 617 { 618 struct ifaddr *ifa; 619 620 /* Return the first configured IP address */ 621 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 622 struct ng_cisco_ipaddr *ips; 623 624 if (ifa->ifa_addr->sa_family != AF_INET) 625 continue; 626 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT); 627 if (resp == NULL) { 628 error = ENOMEM; 629 break; 630 } 631 ips = (struct ng_cisco_ipaddr *)resp->data; 632 ips->ipaddr = ((struct sockaddr_in *) 633 ifa->ifa_addr)->sin_addr; 634 ips->netmask = ((struct sockaddr_in *) 635 ifa->ifa_netmask)->sin_addr; 636 break; 637 } 638 639 /* No IP addresses on this interface? */ 640 if (ifa == NULL) 641 error = EADDRNOTAVAIL; 642 break; 643 } 644 default: 645 error = EINVAL; 646 break; 647 } 648 break; 649 case NGM_FLOW_COOKIE: 650 switch (msg->header.cmd) { 651 case NGM_LINK_IS_UP: 652 ifp->if_flags |= IFF_UP; 653 break; 654 case NGM_LINK_IS_DOWN: 655 ifp->if_flags &= ~IFF_UP; 656 break; 657 default: 658 break; 659 } 660 break; 661 default: 662 error = EINVAL; 663 break; 664 } 665 NG_RESPOND_MSG(error, node, item, resp); 666 NG_FREE_MSG(msg); 667 return (error); 668 } 669 670 /* 671 * Recive data from a hook. Pass the packet to the correct input routine. 672 */ 673 static int 674 ng_iface_rcvdata(hook_p hook, item_p item) 675 { 676 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 677 const iffam_p iffam = get_iffam_from_hook(priv, hook); 678 struct ifnet *const ifp = priv->ifp; 679 struct mbuf *m; 680 int isr; 681 682 NGI_GET_M(item, m); 683 NG_FREE_ITEM(item); 684 /* Sanity checks */ 685 KASSERT(iffam != NULL, ("%s: iffam", __func__)); 686 M_ASSERTPKTHDR(m); 687 if ((ifp->if_flags & IFF_UP) == 0) { 688 NG_FREE_M(m); 689 return (ENETDOWN); 690 } 691 692 /* Update interface stats */ 693 ifp->if_ipackets++; 694 ifp->if_ibytes += m->m_pkthdr.len; 695 696 /* Note receiving interface */ 697 m->m_pkthdr.rcvif = ifp; 698 699 /* Berkeley packet filter */ 700 ng_iface_bpftap(ifp, m, iffam->family); 701 702 /* Send packet */ 703 switch (iffam->family) { 704 #ifdef INET 705 case AF_INET: 706 isr = NETISR_IP; 707 break; 708 #endif 709 #ifdef INET6 710 case AF_INET6: 711 isr = NETISR_IPV6; 712 break; 713 #endif 714 #ifdef IPX 715 case AF_IPX: 716 isr = NETISR_IPX; 717 break; 718 #endif 719 #ifdef NETATALK 720 case AF_APPLETALK: 721 isr = NETISR_ATALK2; 722 break; 723 #endif 724 default: 725 m_freem(m); 726 return (EAFNOSUPPORT); 727 } 728 /* First chunk of an mbuf contains good junk */ 729 if (harvest.point_to_point) 730 random_harvest(m, 16, 3, 0, RANDOM_NET); 731 netisr_dispatch(isr, m); 732 return (0); 733 } 734 735 /* 736 * Shutdown and remove the node and its associated interface. 737 */ 738 static int 739 ng_iface_shutdown(node_p node) 740 { 741 const priv_p priv = NG_NODE_PRIVATE(node); 742 743 bpfdetach(priv->ifp); 744 if_detach(priv->ifp); 745 FREE(priv->ifp, M_NETGRAPH_IFACE); 746 priv->ifp = NULL; 747 free_unr(ng_iface_unit, priv->unit); 748 FREE(priv, M_NETGRAPH_IFACE); 749 NG_NODE_SET_PRIVATE(node, NULL); 750 NG_NODE_UNREF(node); 751 return (0); 752 } 753 754 /* 755 * Hook disconnection. Note that we do *not* shutdown when all 756 * hooks have been disconnected. 757 */ 758 static int 759 ng_iface_disconnect(hook_p hook) 760 { 761 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 762 const iffam_p iffam = get_iffam_from_hook(priv, hook); 763 764 if (iffam == NULL) 765 panic(__func__); 766 *get_hook_from_iffam(priv, iffam) = NULL; 767 return (0); 768 } 769 770 /* 771 * Handle loading and unloading for this node type. 772 */ 773 static int 774 ng_iface_mod_event(module_t mod, int event, void *data) 775 { 776 int error = 0; 777 778 switch (event) { 779 case MOD_LOAD: 780 ng_iface_unit = new_unrhdr(0, 0xffff, NULL); 781 break; 782 case MOD_UNLOAD: 783 delete_unrhdr(ng_iface_unit); 784 break; 785 default: 786 error = EOPNOTSUPP; 787 break; 788 } 789 return (error); 790 }
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