Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/netgraph/ng_iface.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
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 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 struct unrhdr *ng_iface_unit; 211 212 /************************************************************************ 213 HELPER STUFF 214 ************************************************************************/ 215 216 /* 217 * Get the family descriptor from the family ID 218 */ 219 static __inline iffam_p 220 get_iffam_from_af(sa_family_t family) 221 { 222 iffam_p iffam; 223 int k; 224 225 for (k = 0; k < NUM_FAMILIES; k++) { 226 iffam = &gFamilies[k]; 227 if (iffam->family == family) 228 return (iffam); 229 } 230 return (NULL); 231 } 232 233 /* 234 * Get the family descriptor from the hook 235 */ 236 static __inline iffam_p 237 get_iffam_from_hook(priv_p priv, hook_p hook) 238 { 239 int k; 240 241 for (k = 0; k < NUM_FAMILIES; k++) 242 if (priv->hooks[k] == hook) 243 return (&gFamilies[k]); 244 return (NULL); 245 } 246 247 /* 248 * Get the hook from the iffam descriptor 249 */ 250 251 static __inline hook_p * 252 get_hook_from_iffam(priv_p priv, iffam_p iffam) 253 { 254 return (&priv->hooks[iffam - gFamilies]); 255 } 256 257 /* 258 * Get the iffam descriptor from the name 259 */ 260 static __inline iffam_p 261 get_iffam_from_name(const char *name) 262 { 263 iffam_p iffam; 264 int k; 265 266 for (k = 0; k < NUM_FAMILIES; k++) { 267 iffam = &gFamilies[k]; 268 if (!strcmp(iffam->hookname, name)) 269 return (iffam); 270 } 271 return (NULL); 272 } 273 274 /************************************************************************ 275 INTERFACE STUFF 276 ************************************************************************/ 277 278 /* 279 * Process an ioctl for the virtual interface 280 */ 281 static int 282 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data) 283 { 284 struct ifreq *const ifr = (struct ifreq *) data; 285 int s, error = 0; 286 287 #ifdef DEBUG 288 ng_iface_print_ioctl(ifp, command, data); 289 #endif 290 s = splimp(); 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 (void) splx(s); 343 return (error); 344 } 345 346 /* 347 * This routine is called to deliver a packet out the interface. 348 * We simply look at the address family and relay the packet to 349 * the corresponding hook, if it exists and is connected. 350 */ 351 352 static int 353 ng_iface_output(struct ifnet *ifp, struct mbuf *m, 354 struct sockaddr *dst, struct rtentry *rt0) 355 { 356 struct m_tag *mtag; 357 uint32_t af; 358 int error; 359 360 /* Check interface flags */ 361 if (!((ifp->if_flags & IFF_UP) && 362 (ifp->if_drv_flags & IFF_DRV_RUNNING))) { 363 m_freem(m); 364 return (ENETDOWN); 365 } 366 367 /* Protect from deadly infinite recursion. */ 368 while ((mtag = m_tag_locate(m, MTAG_NGIF, MTAG_NGIF_CALLED, NULL))) { 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 dst->sa_family = af; 388 } 389 390 /* Berkeley packet filter */ 391 ng_iface_bpftap(ifp, m, dst->sa_family); 392 393 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 394 M_PREPEND(m, sizeof(sa_family_t), M_DONTWAIT); 395 if (m == NULL) { 396 IFQ_LOCK(&ifp->if_snd); 397 IFQ_INC_DROPS(&ifp->if_snd); 398 IFQ_UNLOCK(&ifp->if_snd); 399 ifp->if_oerrors++; 400 return (ENOBUFS); 401 } 402 *(sa_family_t *)m->m_data = dst->sa_family; 403 IFQ_HANDOFF(ifp, m, error); 404 } else 405 error = ng_iface_send(ifp, m, dst->sa_family); 406 407 return (error); 408 } 409 410 /* 411 * Start method is used only when ALTQ is enabled. 412 */ 413 static void 414 ng_iface_start(struct ifnet *ifp) 415 { 416 struct mbuf *m; 417 sa_family_t sa; 418 419 KASSERT(ALTQ_IS_ENABLED(&ifp->if_snd), ("%s without ALTQ", __func__)); 420 421 for(;;) { 422 IFQ_DRV_DEQUEUE(&ifp->if_snd, m); 423 if (m == NULL) 424 break; 425 sa = *mtod(m, sa_family_t *); 426 m_adj(m, sizeof(sa_family_t)); 427 ng_iface_send(ifp, m, sa); 428 } 429 } 430 431 /* 432 * Flash a packet by the BPF (requires prepending 4 byte AF header) 433 * Note the phoney mbuf; this is OK because BPF treats it read-only. 434 */ 435 static void 436 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family) 437 { 438 KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__)); 439 if (bpf_peers_present(ifp->if_bpf)) { 440 int32_t family4 = (int32_t)family; 441 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m); 442 } 443 } 444 445 /* 446 * This routine does actual delivery of the packet into the 447 * netgraph(4). It is called from ng_iface_start() and 448 * ng_iface_output(). 449 */ 450 static int 451 ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa) 452 { 453 const priv_p priv = (priv_p) ifp->if_softc; 454 const iffam_p iffam = get_iffam_from_af(sa); 455 int error; 456 int len; 457 458 /* Check address family to determine hook (if known) */ 459 if (iffam == NULL) { 460 m_freem(m); 461 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa); 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, 469 mbuf will get freed. */ 470 NG_SEND_DATA_ONLY(error, *get_hook_from_iffam(priv, iffam), m); 471 472 /* Update stats. */ 473 if (error == 0) { 474 ifp->if_obytes += len; 475 ifp->if_opackets++; 476 } 477 478 return (error); 479 } 480 481 #ifdef DEBUG 482 /* 483 * Display an ioctl to the virtual interface 484 */ 485 486 static void 487 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data) 488 { 489 char *str; 490 491 switch (command & IOC_DIRMASK) { 492 case IOC_VOID: 493 str = "IO"; 494 break; 495 case IOC_OUT: 496 str = "IOR"; 497 break; 498 case IOC_IN: 499 str = "IOW"; 500 break; 501 case IOC_INOUT: 502 str = "IORW"; 503 break; 504 default: 505 str = "IO??"; 506 } 507 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n", 508 ifp->if_xname, 509 str, 510 IOCGROUP(command), 511 command & 0xff, 512 IOCPARM_LEN(command)); 513 } 514 #endif /* DEBUG */ 515 516 /************************************************************************ 517 NETGRAPH NODE STUFF 518 ************************************************************************/ 519 520 /* 521 * Constructor for a node 522 */ 523 static int 524 ng_iface_constructor(node_p node) 525 { 526 struct ifnet *ifp; 527 priv_p priv; 528 529 /* Allocate node and interface private structures */ 530 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH_IFACE, M_NOWAIT|M_ZERO); 531 if (priv == NULL) 532 return (ENOMEM); 533 ifp = if_alloc(IFT_PROPVIRTUAL); 534 if (ifp == NULL) { 535 FREE(priv, M_NETGRAPH_IFACE); 536 return (ENOMEM); 537 } 538 539 /* Link them together */ 540 ifp->if_softc = priv; 541 priv->ifp = ifp; 542 543 /* Get an interface unit number */ 544 priv->unit = alloc_unr(ng_iface_unit); 545 546 /* Link together node and private info */ 547 NG_NODE_SET_PRIVATE(node, priv); 548 priv->node = node; 549 550 /* Initialize interface structure */ 551 if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit); 552 ifp->if_output = ng_iface_output; 553 ifp->if_start = ng_iface_start; 554 ifp->if_ioctl = ng_iface_ioctl; 555 ifp->if_watchdog = NULL; 556 ifp->if_mtu = NG_IFACE_MTU_DEFAULT; 557 ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST); 558 ifp->if_type = IFT_PROPVIRTUAL; /* XXX */ 559 ifp->if_addrlen = 0; /* XXX */ 560 ifp->if_hdrlen = 0; /* XXX */ 561 ifp->if_baudrate = 64000; /* XXX */ 562 IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN); 563 ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN; 564 IFQ_SET_READY(&ifp->if_snd); 565 566 /* Give this node the same name as the interface (if possible) */ 567 if (ng_name_node(node, ifp->if_xname) != 0) 568 log(LOG_WARNING, "%s: can't acquire netgraph name\n", 569 ifp->if_xname); 570 571 /* Attach the interface */ 572 if_attach(ifp); 573 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t)); 574 575 /* Done */ 576 return (0); 577 } 578 579 /* 580 * Give our ok for a hook to be added 581 */ 582 static int 583 ng_iface_newhook(node_p node, hook_p hook, const char *name) 584 { 585 const iffam_p iffam = get_iffam_from_name(name); 586 hook_p *hookptr; 587 588 if (iffam == NULL) 589 return (EPFNOSUPPORT); 590 hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam); 591 if (*hookptr != NULL) 592 return (EISCONN); 593 *hookptr = hook; 594 NG_HOOK_HI_STACK(hook); 595 return (0); 596 } 597 598 /* 599 * Receive a control message 600 */ 601 static int 602 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook) 603 { 604 const priv_p priv = NG_NODE_PRIVATE(node); 605 struct ifnet *const ifp = priv->ifp; 606 struct ng_mesg *resp = NULL; 607 int error = 0; 608 struct ng_mesg *msg; 609 610 NGI_GET_MSG(item, msg); 611 switch (msg->header.typecookie) { 612 case NGM_IFACE_COOKIE: 613 switch (msg->header.cmd) { 614 case NGM_IFACE_GET_IFNAME: 615 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT); 616 if (resp == NULL) { 617 error = ENOMEM; 618 break; 619 } 620 strlcpy(resp->data, ifp->if_xname, IFNAMSIZ); 621 break; 622 623 case NGM_IFACE_POINT2POINT: 624 case NGM_IFACE_BROADCAST: 625 { 626 627 /* Deny request if interface is UP */ 628 if ((ifp->if_flags & IFF_UP) != 0) 629 return (EBUSY); 630 631 /* Change flags */ 632 switch (msg->header.cmd) { 633 case NGM_IFACE_POINT2POINT: 634 ifp->if_flags |= IFF_POINTOPOINT; 635 ifp->if_flags &= ~IFF_BROADCAST; 636 break; 637 case NGM_IFACE_BROADCAST: 638 ifp->if_flags &= ~IFF_POINTOPOINT; 639 ifp->if_flags |= IFF_BROADCAST; 640 break; 641 } 642 break; 643 } 644 645 case NGM_IFACE_GET_IFINDEX: 646 NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT); 647 if (resp == NULL) { 648 error = ENOMEM; 649 break; 650 } 651 *((uint32_t *)resp->data) = priv->ifp->if_index; 652 break; 653 654 default: 655 error = EINVAL; 656 break; 657 } 658 break; 659 case NGM_CISCO_COOKIE: 660 switch (msg->header.cmd) { 661 case NGM_CISCO_GET_IPADDR: /* we understand this too */ 662 { 663 struct ifaddr *ifa; 664 665 /* Return the first configured IP address */ 666 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 667 struct ng_cisco_ipaddr *ips; 668 669 if (ifa->ifa_addr->sa_family != AF_INET) 670 continue; 671 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT); 672 if (resp == NULL) { 673 error = ENOMEM; 674 break; 675 } 676 ips = (struct ng_cisco_ipaddr *)resp->data; 677 ips->ipaddr = ((struct sockaddr_in *) 678 ifa->ifa_addr)->sin_addr; 679 ips->netmask = ((struct sockaddr_in *) 680 ifa->ifa_netmask)->sin_addr; 681 break; 682 } 683 684 /* No IP addresses on this interface? */ 685 if (ifa == NULL) 686 error = EADDRNOTAVAIL; 687 break; 688 } 689 default: 690 error = EINVAL; 691 break; 692 } 693 break; 694 case NGM_FLOW_COOKIE: 695 switch (msg->header.cmd) { 696 case NGM_LINK_IS_UP: 697 ifp->if_drv_flags |= IFF_DRV_RUNNING; 698 break; 699 case NGM_LINK_IS_DOWN: 700 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 701 break; 702 default: 703 break; 704 } 705 break; 706 default: 707 error = EINVAL; 708 break; 709 } 710 NG_RESPOND_MSG(error, node, item, resp); 711 NG_FREE_MSG(msg); 712 return (error); 713 } 714 715 /* 716 * Recive data from a hook. Pass the packet to the correct input routine. 717 */ 718 static int 719 ng_iface_rcvdata(hook_p hook, item_p item) 720 { 721 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 722 const iffam_p iffam = get_iffam_from_hook(priv, hook); 723 struct ifnet *const ifp = priv->ifp; 724 struct mbuf *m; 725 int isr; 726 727 NGI_GET_M(item, m); 728 NG_FREE_ITEM(item); 729 /* Sanity checks */ 730 KASSERT(iffam != NULL, ("%s: iffam", __func__)); 731 M_ASSERTPKTHDR(m); 732 if ((ifp->if_flags & IFF_UP) == 0) { 733 NG_FREE_M(m); 734 return (ENETDOWN); 735 } 736 737 /* Update interface stats */ 738 ifp->if_ipackets++; 739 ifp->if_ibytes += m->m_pkthdr.len; 740 741 /* Note receiving interface */ 742 m->m_pkthdr.rcvif = ifp; 743 744 /* Berkeley packet filter */ 745 ng_iface_bpftap(ifp, m, iffam->family); 746 747 /* Send packet */ 748 switch (iffam->family) { 749 #ifdef INET 750 case AF_INET: 751 isr = NETISR_IP; 752 break; 753 #endif 754 #ifdef INET6 755 case AF_INET6: 756 isr = NETISR_IPV6; 757 break; 758 #endif 759 #ifdef IPX 760 case AF_IPX: 761 isr = NETISR_IPX; 762 break; 763 #endif 764 #ifdef NETATALK 765 case AF_APPLETALK: 766 isr = NETISR_ATALK2; 767 break; 768 #endif 769 default: 770 m_freem(m); 771 return (EAFNOSUPPORT); 772 } 773 /* First chunk of an mbuf contains good junk */ 774 if (harvest.point_to_point) 775 random_harvest(m, 16, 3, 0, RANDOM_NET); 776 netisr_dispatch(isr, m); 777 return (0); 778 } 779 780 /* 781 * Shutdown and remove the node and its associated interface. 782 */ 783 static int 784 ng_iface_shutdown(node_p node) 785 { 786 const priv_p priv = NG_NODE_PRIVATE(node); 787 788 bpfdetach(priv->ifp); 789 if_detach(priv->ifp); 790 if_free(priv->ifp); 791 priv->ifp = NULL; 792 free_unr(ng_iface_unit, priv->unit); 793 FREE(priv, M_NETGRAPH_IFACE); 794 NG_NODE_SET_PRIVATE(node, NULL); 795 NG_NODE_UNREF(node); 796 return (0); 797 } 798 799 /* 800 * Hook disconnection. Note that we do *not* shutdown when all 801 * hooks have been disconnected. 802 */ 803 static int 804 ng_iface_disconnect(hook_p hook) 805 { 806 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 807 const iffam_p iffam = get_iffam_from_hook(priv, hook); 808 809 if (iffam == NULL) 810 panic(__func__); 811 *get_hook_from_iffam(priv, iffam) = NULL; 812 return (0); 813 } 814 815 /* 816 * Handle loading and unloading for this node type. 817 */ 818 static int 819 ng_iface_mod_event(module_t mod, int event, void *data) 820 { 821 int error = 0; 822 823 switch (event) { 824 case MOD_LOAD: 825 ng_iface_unit = new_unrhdr(0, 0xffff, NULL); 826 break; 827 case MOD_UNLOAD: 828 delete_unrhdr(ng_iface_unit); 829 break; 830 default: 831 error = EOPNOTSUPP; 832 break; 833 } 834 return (error); 835 }
Cache object: 811c58c6901ec2cc5f2f1abf7fafa4e4
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]