1 2 /* 3 * ng_iface.c 4 * 5 * Copyright (c) 1996-1999 Whistle Communications, Inc. 6 * All rights reserved. 7 * 8 * Subject to the following obligations and disclaimer of warranty, use and 9 * redistribution of this software, in source or object code forms, with or 10 * without modifications are expressly permitted by Whistle Communications; 11 * provided, however, that: 12 * 1. Any and all reproductions of the source or object code must include the 13 * copyright notice above and the following disclaimer of warranties; and 14 * 2. No rights are granted, in any manner or form, to use Whistle 15 * Communications, Inc. trademarks, including the mark "WHISTLE 16 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 17 * such appears in the above copyright notice or in the software. 18 * 19 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 20 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 21 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 22 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 23 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 24 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 25 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 26 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 27 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 28 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 29 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 30 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 31 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 34 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 35 * OF SUCH DAMAGE. 36 * 37 * Author: Archie Cobbs <archie@freebsd.org> 38 * 39 * $FreeBSD: src/sys/netgraph/ng_iface.c,v 1.7.2.5 2002/07/02 23:44:02 archie Exp $ 40 * $DragonFly: src/sys/netgraph/iface/ng_iface.c,v 1.14 2008/01/05 14:02:39 swildner Exp $ 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/sockio.h> 68 #include <sys/socket.h> 69 #include <sys/syslog.h> 70 #include <sys/libkern.h> 71 #include <sys/thread2.h> 72 73 #include <net/if.h> 74 #include <net/if_types.h> 75 #include <net/netisr.h> 76 #include <net/bpf.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 "ng_iface.h" 84 #include <netgraph/cisco/ng_cisco.h> 85 86 /* This struct describes one address family */ 87 struct iffam { 88 sa_family_t family; /* Address family */ 89 const char *hookname; /* Name for hook */ 90 }; 91 typedef const struct iffam *iffam_p; 92 93 /* List of address families supported by our interface */ 94 const static struct iffam gFamilies[] = { 95 { AF_INET, NG_IFACE_HOOK_INET }, 96 { AF_INET6, NG_IFACE_HOOK_INET6 }, 97 { AF_APPLETALK, NG_IFACE_HOOK_ATALK }, 98 { AF_IPX, NG_IFACE_HOOK_IPX }, 99 { AF_ATM, NG_IFACE_HOOK_ATM }, 100 { AF_NATM, NG_IFACE_HOOK_NATM }, 101 { AF_NS, NG_IFACE_HOOK_NS }, 102 }; 103 #define NUM_FAMILIES (sizeof(gFamilies) / sizeof(*gFamilies)) 104 105 /* Node private data */ 106 struct ng_iface_private { 107 struct ifnet *ifp; /* Our interface */ 108 int unit; /* Interface unit number */ 109 node_p node; /* Our netgraph node */ 110 hook_p hooks[NUM_FAMILIES]; /* Hook for each address family */ 111 }; 112 typedef struct ng_iface_private *priv_p; 113 114 /* Interface methods */ 115 static void ng_iface_start(struct ifnet *ifp); 116 static int ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data, 117 struct ucred *cr); 118 static int ng_iface_output(struct ifnet *ifp, struct mbuf *m0, 119 struct sockaddr *dst, struct rtentry *rt0); 120 static void ng_iface_bpftap(struct ifnet *ifp, 121 struct mbuf *m, sa_family_t family); 122 #ifdef DEBUG 123 static void ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data); 124 #endif 125 126 /* Netgraph methods */ 127 static ng_constructor_t ng_iface_constructor; 128 static ng_rcvmsg_t ng_iface_rcvmsg; 129 static ng_shutdown_t ng_iface_rmnode; 130 static ng_newhook_t ng_iface_newhook; 131 static ng_rcvdata_t ng_iface_rcvdata; 132 static ng_disconnect_t ng_iface_disconnect; 133 134 /* Helper stuff */ 135 static iffam_p get_iffam_from_af(sa_family_t family); 136 static iffam_p get_iffam_from_hook(priv_p priv, hook_p hook); 137 static iffam_p get_iffam_from_name(const char *name); 138 static hook_p *get_hook_from_iffam(priv_p priv, iffam_p iffam); 139 140 /* Parse type for struct ng_iface_ifname */ 141 static const struct ng_parse_fixedstring_info ng_iface_ifname_info = { 142 NG_IFACE_IFACE_NAME_MAX + 1 143 }; 144 static const struct ng_parse_type ng_iface_ifname_type = { 145 &ng_parse_fixedstring_type, 146 &ng_iface_ifname_info 147 }; 148 149 /* Parse type for struct ng_cisco_ipaddr */ 150 static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[] 151 = NG_CISCO_IPADDR_TYPE_INFO; 152 static const struct ng_parse_type ng_cisco_ipaddr_type = { 153 &ng_parse_struct_type, 154 &ng_cisco_ipaddr_type_fields 155 }; 156 157 /* List of commands and how to convert arguments to/from ASCII */ 158 static const struct ng_cmdlist ng_iface_cmds[] = { 159 { 160 NGM_IFACE_COOKIE, 161 NGM_IFACE_GET_IFNAME, 162 "getifname", 163 NULL, 164 &ng_iface_ifname_type 165 }, 166 { 167 NGM_IFACE_COOKIE, 168 NGM_IFACE_POINT2POINT, 169 "point2point", 170 NULL, 171 NULL 172 }, 173 { 174 NGM_IFACE_COOKIE, 175 NGM_IFACE_BROADCAST, 176 "broadcast", 177 NULL, 178 NULL 179 }, 180 { 181 NGM_CISCO_COOKIE, 182 NGM_CISCO_GET_IPADDR, 183 "getipaddr", 184 NULL, 185 &ng_cisco_ipaddr_type 186 }, 187 { 0 } 188 }; 189 190 /* Node type descriptor */ 191 static struct ng_type typestruct = { 192 NG_VERSION, 193 NG_IFACE_NODE_TYPE, 194 NULL, 195 ng_iface_constructor, 196 ng_iface_rcvmsg, 197 ng_iface_rmnode, 198 ng_iface_newhook, 199 NULL, 200 NULL, 201 ng_iface_rcvdata, 202 ng_iface_rcvdata, 203 ng_iface_disconnect, 204 ng_iface_cmds 205 }; 206 NETGRAPH_INIT(iface, &typestruct); 207 208 /* We keep a bitmap indicating which unit numbers are free. 209 One means the unit number is free, zero means it's taken. */ 210 static int *ng_iface_units = NULL; 211 static int ng_iface_units_len = 0; 212 213 #define UNITS_BITSPERWORD (sizeof(*ng_iface_units) * NBBY) 214 215 /************************************************************************ 216 HELPER STUFF 217 ************************************************************************/ 218 219 /* 220 * Get the family descriptor from the family ID 221 */ 222 static __inline__ iffam_p 223 get_iffam_from_af(sa_family_t family) 224 { 225 iffam_p iffam; 226 int k; 227 228 for (k = 0; k < NUM_FAMILIES; k++) { 229 iffam = &gFamilies[k]; 230 if (iffam->family == family) 231 return (iffam); 232 } 233 return (NULL); 234 } 235 236 /* 237 * Get the family descriptor from the hook 238 */ 239 static __inline__ iffam_p 240 get_iffam_from_hook(priv_p priv, hook_p hook) 241 { 242 int k; 243 244 for (k = 0; k < NUM_FAMILIES; k++) 245 if (priv->hooks[k] == hook) 246 return (&gFamilies[k]); 247 return (NULL); 248 } 249 250 /* 251 * Get the hook from the iffam descriptor 252 */ 253 254 static __inline__ hook_p * 255 get_hook_from_iffam(priv_p priv, iffam_p iffam) 256 { 257 return (&priv->hooks[iffam - gFamilies]); 258 } 259 260 /* 261 * Get the iffam descriptor from the name 262 */ 263 static __inline__ iffam_p 264 get_iffam_from_name(const char *name) 265 { 266 iffam_p iffam; 267 int k; 268 269 for (k = 0; k < NUM_FAMILIES; k++) { 270 iffam = &gFamilies[k]; 271 if (!strcmp(iffam->hookname, name)) 272 return (iffam); 273 } 274 return (NULL); 275 } 276 277 /* 278 * Find the first free unit number for a new interface. 279 * Increase the size of the unit bitmap as necessary. 280 */ 281 static __inline__ int 282 ng_iface_get_unit(int *unit) 283 { 284 int index, bit; 285 286 for (index = 0; index < ng_iface_units_len 287 && ng_iface_units[index] == 0; index++); 288 if (index == ng_iface_units_len) { /* extend array */ 289 int i, *newarray, newlen; 290 291 newlen = (2 * ng_iface_units_len) + 4; 292 MALLOC(newarray, int *, newlen * sizeof(*ng_iface_units), 293 M_NETGRAPH, M_NOWAIT); 294 if (newarray == NULL) 295 return (ENOMEM); 296 bcopy(ng_iface_units, newarray, 297 ng_iface_units_len * sizeof(*ng_iface_units)); 298 for (i = ng_iface_units_len; i < newlen; i++) 299 newarray[i] = ~0; 300 if (ng_iface_units != NULL) 301 FREE(ng_iface_units, M_NETGRAPH); 302 ng_iface_units = newarray; 303 ng_iface_units_len = newlen; 304 } 305 bit = ffs(ng_iface_units[index]) - 1; 306 KASSERT(bit >= 0 && bit <= UNITS_BITSPERWORD - 1, 307 ("%s: word=%d bit=%d", __func__, ng_iface_units[index], bit)); 308 ng_iface_units[index] &= ~(1 << bit); 309 *unit = (index * UNITS_BITSPERWORD) + bit; 310 return (0); 311 } 312 313 /* 314 * Free a no longer needed unit number. 315 */ 316 static __inline__ void 317 ng_iface_free_unit(int unit) 318 { 319 int index, bit; 320 321 index = unit / UNITS_BITSPERWORD; 322 bit = unit % UNITS_BITSPERWORD; 323 KASSERT(index < ng_iface_units_len, 324 ("%s: unit=%d len=%d", __func__, unit, ng_iface_units_len)); 325 KASSERT((ng_iface_units[index] & (1 << bit)) == 0, 326 ("%s: unit=%d is free", __func__, unit)); 327 ng_iface_units[index] |= (1 << bit); 328 /* 329 * XXX We could think about reducing the size of ng_iface_units[] 330 * XXX here if the last portion is all ones 331 */ 332 } 333 334 /************************************************************************ 335 INTERFACE STUFF 336 ************************************************************************/ 337 338 /* 339 * Process an ioctl for the virtual interface 340 */ 341 static int 342 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data, 343 struct ucred *cr) 344 { 345 struct ifreq *const ifr = (struct ifreq *) data; 346 int error = 0; 347 348 #ifdef DEBUG 349 ng_iface_print_ioctl(ifp, command, data); 350 #endif 351 crit_enter(); 352 switch (command) { 353 354 /* These two are mostly handled at a higher layer */ 355 case SIOCSIFADDR: 356 ifp->if_flags |= (IFF_UP | IFF_RUNNING); 357 ifp->if_flags &= ~(IFF_OACTIVE); 358 break; 359 case SIOCGIFADDR: 360 break; 361 362 /* Set flags */ 363 case SIOCSIFFLAGS: 364 /* 365 * If the interface is marked up and stopped, then start it. 366 * If it is marked down and running, then stop it. 367 */ 368 if (ifr->ifr_flags & IFF_UP) { 369 if (!(ifp->if_flags & IFF_RUNNING)) { 370 ifp->if_flags &= ~(IFF_OACTIVE); 371 ifp->if_flags |= IFF_RUNNING; 372 } 373 } else { 374 if (ifp->if_flags & IFF_RUNNING) 375 ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE); 376 } 377 break; 378 379 /* Set the interface MTU */ 380 case SIOCSIFMTU: 381 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX 382 || ifr->ifr_mtu < NG_IFACE_MTU_MIN) 383 error = EINVAL; 384 else 385 ifp->if_mtu = ifr->ifr_mtu; 386 break; 387 388 /* Stuff that's not supported */ 389 case SIOCADDMULTI: 390 case SIOCDELMULTI: 391 error = 0; 392 break; 393 case SIOCSIFPHYS: 394 error = EOPNOTSUPP; 395 break; 396 397 default: 398 error = EINVAL; 399 break; 400 } 401 crit_exit(); 402 return (error); 403 } 404 405 /* 406 * This routine is called to deliver a packet out the interface. 407 * We simply look at the address family and relay the packet to 408 * the corresponding hook, if it exists and is connected. 409 */ 410 411 static int 412 ng_iface_output(struct ifnet *ifp, struct mbuf *m, 413 struct sockaddr *dst, struct rtentry *rt0) 414 { 415 const priv_p priv = (priv_p) ifp->if_softc; 416 const iffam_p iffam = get_iffam_from_af(dst->sa_family); 417 meta_p meta = NULL; 418 int len, error = 0; 419 420 /* Check interface flags */ 421 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { 422 m_freem(m); 423 return (ENETDOWN); 424 } 425 426 /* BPF writes need to be handled specially */ 427 if (dst->sa_family == AF_UNSPEC) { 428 if (m->m_len < 4 && (m = m_pullup(m, 4)) == NULL) 429 return (ENOBUFS); 430 dst->sa_family = (sa_family_t)*mtod(m, int32_t *); 431 m->m_data += 4; 432 m->m_len -= 4; 433 m->m_pkthdr.len -= 4; 434 } 435 436 /* Berkeley packet filter */ 437 ng_iface_bpftap(ifp, m, dst->sa_family); 438 439 /* Check address family to determine hook (if known) */ 440 if (iffam == NULL) { 441 m_freem(m); 442 log(LOG_WARNING, "%s: can't handle af%d\n", 443 ifp->if_xname, (int)dst->sa_family); 444 return (EAFNOSUPPORT); 445 } 446 447 /* Copy length before the mbuf gets invalidated */ 448 len = m->m_pkthdr.len; 449 450 /* Send packet; if hook is not connected, mbuf will get freed. */ 451 NG_SEND_DATA(error, *get_hook_from_iffam(priv, iffam), m, meta); 452 453 /* Update stats */ 454 if (error == 0) { 455 ifp->if_obytes += len; 456 ifp->if_opackets++; 457 } 458 return (error); 459 } 460 461 /* 462 * This routine should never be called 463 */ 464 465 static void 466 ng_iface_start(struct ifnet *ifp) 467 { 468 kprintf("%s: %s called?", ifp->if_xname, __func__); 469 } 470 471 /* 472 * Flash a packet by the BPF (requires prepending 4 byte AF header) 473 */ 474 static void 475 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family) 476 { 477 int32_t family4 = (int32_t)family; 478 479 KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__)); 480 481 if (ifp->if_bpf) 482 bpf_ptap(ifp->if_bpf, m, &family, sizeof(family4)); 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 *nodep) 529 { 530 char ifname[NG_IFACE_IFACE_NAME_MAX + 1]; 531 struct ifnet *ifp; 532 node_p node; 533 priv_p priv; 534 int error = 0; 535 536 /* Allocate node and interface private structures */ 537 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO); 538 if (priv == NULL) 539 return (ENOMEM); 540 MALLOC(ifp, struct ifnet *, sizeof(*ifp), M_NETGRAPH, M_NOWAIT | M_ZERO); 541 if (ifp == NULL) { 542 FREE(priv, M_NETGRAPH); 543 return (ENOMEM); 544 } 545 546 /* Link them together */ 547 ifp->if_softc = priv; 548 priv->ifp = ifp; 549 550 /* Get an interface unit number */ 551 if ((error = ng_iface_get_unit(&priv->unit)) != 0) { 552 FREE(ifp, M_NETGRAPH); 553 FREE(priv, M_NETGRAPH); 554 return (error); 555 } 556 557 /* Call generic node constructor */ 558 if ((error = ng_make_node_common(&typestruct, nodep)) != 0) { 559 ng_iface_free_unit(priv->unit); 560 FREE(ifp, M_NETGRAPH); 561 FREE(priv, M_NETGRAPH); 562 return (error); 563 } 564 node = *nodep; 565 566 /* Link together node and private info */ 567 node->private = priv; 568 priv->node = node; 569 570 /* Initialize interface structure */ 571 if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit); 572 ifp->if_output = ng_iface_output; 573 ifp->if_start = ng_iface_start; 574 ifp->if_ioctl = ng_iface_ioctl; 575 ifp->if_watchdog = NULL; 576 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN; 577 ifp->if_mtu = NG_IFACE_MTU_DEFAULT; 578 ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST); 579 ifp->if_type = IFT_PROPVIRTUAL; /* XXX */ 580 ifp->if_addrlen = 0; /* XXX */ 581 ifp->if_hdrlen = 0; /* XXX */ 582 ifp->if_baudrate = 64000; /* XXX */ 583 TAILQ_INIT(&ifp->if_addrhead); 584 585 /* Give this node the same name as the interface (if possible) */ 586 bzero(ifname, sizeof(ifname)); 587 strlcpy(ifname, ifp->if_xname, sizeof(ifname)); 588 if (ng_name_node(node, ifname) != 0) 589 log(LOG_WARNING, "%s: can't acquire netgraph name\n", ifname); 590 591 /* Attach the interface */ 592 if_attach(ifp, NULL); 593 bpfattach(ifp, DLT_NULL, sizeof(u_int)); 594 595 /* Done */ 596 return (0); 597 } 598 599 /* 600 * Give our ok for a hook to be added 601 */ 602 static int 603 ng_iface_newhook(node_p node, hook_p hook, const char *name) 604 { 605 const iffam_p iffam = get_iffam_from_name(name); 606 hook_p *hookptr; 607 608 if (iffam == NULL) 609 return (EPFNOSUPPORT); 610 hookptr = get_hook_from_iffam((priv_p) node->private, iffam); 611 if (*hookptr != NULL) 612 return (EISCONN); 613 *hookptr = hook; 614 return (0); 615 } 616 617 /* 618 * Receive a control message 619 */ 620 static int 621 ng_iface_rcvmsg(node_p node, struct ng_mesg *msg, 622 const char *retaddr, struct ng_mesg **rptr) 623 { 624 const priv_p priv = node->private; 625 struct ifnet *const ifp = priv->ifp; 626 struct ng_mesg *resp = NULL; 627 int error = 0; 628 629 switch (msg->header.typecookie) { 630 case NGM_IFACE_COOKIE: 631 switch (msg->header.cmd) { 632 case NGM_IFACE_GET_IFNAME: 633 { 634 struct ng_iface_ifname *arg; 635 636 NG_MKRESPONSE(resp, msg, sizeof(*arg), M_NOWAIT); 637 if (resp == NULL) { 638 error = ENOMEM; 639 break; 640 } 641 arg = (struct ng_iface_ifname *)resp->data; 642 strlcpy(arg->ngif_name, ifp->if_xname, 643 sizeof(arg->ngif_name)); 644 break; 645 } 646 647 case NGM_IFACE_POINT2POINT: 648 case NGM_IFACE_BROADCAST: 649 { 650 651 /* Deny request if interface is UP */ 652 if ((ifp->if_flags & IFF_UP) != 0) 653 return (EBUSY); 654 655 /* Change flags */ 656 switch (msg->header.cmd) { 657 case NGM_IFACE_POINT2POINT: 658 ifp->if_flags |= IFF_POINTOPOINT; 659 ifp->if_flags &= ~IFF_BROADCAST; 660 break; 661 case NGM_IFACE_BROADCAST: 662 ifp->if_flags &= ~IFF_POINTOPOINT; 663 ifp->if_flags |= IFF_BROADCAST; 664 break; 665 } 666 break; 667 } 668 669 default: 670 error = EINVAL; 671 break; 672 } 673 break; 674 case NGM_CISCO_COOKIE: 675 switch (msg->header.cmd) { 676 case NGM_CISCO_GET_IPADDR: /* we understand this too */ 677 { 678 struct ifaddr *ifa; 679 680 /* Return the first configured IP address */ 681 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 682 struct ng_cisco_ipaddr *ips; 683 684 if (ifa->ifa_addr->sa_family != AF_INET) 685 continue; 686 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT); 687 if (resp == NULL) { 688 error = ENOMEM; 689 break; 690 } 691 ips = (struct ng_cisco_ipaddr *)resp->data; 692 ips->ipaddr = ((struct sockaddr_in *) 693 ifa->ifa_addr)->sin_addr; 694 ips->netmask = ((struct sockaddr_in *) 695 ifa->ifa_netmask)->sin_addr; 696 break; 697 } 698 699 /* No IP addresses on this interface? */ 700 if (ifa == NULL) 701 error = EADDRNOTAVAIL; 702 break; 703 } 704 default: 705 error = EINVAL; 706 break; 707 } 708 break; 709 default: 710 error = EINVAL; 711 break; 712 } 713 if (rptr) 714 *rptr = resp; 715 else if (resp) 716 FREE(resp, M_NETGRAPH); 717 FREE(msg, M_NETGRAPH); 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, struct mbuf *m, meta_p meta) 726 { 727 const priv_p priv = hook->node->private; 728 const iffam_p iffam = get_iffam_from_hook(priv, hook); 729 struct ifnet *const ifp = priv->ifp; 730 int isr; 731 732 /* Sanity checks */ 733 KASSERT(iffam != NULL, ("%s: iffam", __func__)); 734 KASSERT(m->m_flags & M_PKTHDR, ("%s: not pkthdr", __func__)); 735 if (m == NULL) 736 return (EINVAL); 737 if ((ifp->if_flags & IFF_UP) == 0) { 738 NG_FREE_DATA(m, meta); 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 /* Ignore any meta-data */ 753 NG_FREE_META(meta); 754 755 /* Send packet */ 756 switch (iffam->family) { 757 #ifdef INET 758 case AF_INET: 759 isr = NETISR_IP; 760 break; 761 #endif 762 #ifdef INET6 763 case AF_INET6: 764 isr = NETISR_IPV6; 765 break; 766 #endif 767 #ifdef IPX 768 case AF_IPX: 769 isr = NETISR_IPX; 770 break; 771 #endif 772 #ifdef NETATALK 773 case AF_APPLETALK: 774 isr = NETISR_ATALK2; 775 break; 776 #endif 777 default: 778 m_freem(m); 779 return (EAFNOSUPPORT); 780 } 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_rmnode(node_p node) 790 { 791 const priv_p priv = node->private; 792 793 ng_cutlinks(node); 794 ng_unname(node); 795 bpfdetach(priv->ifp); 796 if_detach(priv->ifp); 797 FREE(priv->ifp, M_NETGRAPH); 798 priv->ifp = NULL; 799 ng_iface_free_unit(priv->unit); 800 FREE(priv, M_NETGRAPH); 801 node->private = NULL; 802 ng_unref(node); 803 return (0); 804 } 805 806 /* 807 * Hook disconnection. Note that we do *not* shutdown when all 808 * hooks have been disconnected. 809 */ 810 static int 811 ng_iface_disconnect(hook_p hook) 812 { 813 const priv_p priv = hook->node->private; 814 const iffam_p iffam = get_iffam_from_hook(priv, hook); 815 816 if (iffam == NULL) 817 panic(__func__); 818 *get_hook_from_iffam(priv, iffam) = NULL; 819 return (0); 820 } 821 822