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 * $Whistle: ng_iface.c,v 1.33 1999/11/01 09:24:51 julian Exp $ 41 */ 42 43 /* 44 * This node is also a system networking interface. It has 45 * a hook for each protocol (IP, AppleTalk, IPX, etc). Packets 46 * are simply relayed between the interface and the hooks. 47 * 48 * Interfaces are named ng0, ng1, etc. New nodes take the 49 * first available interface name. 50 * 51 * This node also includes Berkeley packet filter support. 52 */ 53 54 #include "opt_atalk.h" 55 #include "opt_inet.h" 56 #include "opt_inet6.h" 57 #include "opt_ipx.h" 58 59 #include <sys/param.h> 60 #include <sys/systm.h> 61 #include <sys/errno.h> 62 #include <sys/kernel.h> 63 #include <sys/malloc.h> 64 #include <sys/mbuf.h> 65 #include <sys/errno.h> 66 #include <sys/sockio.h> 67 #include <sys/socket.h> 68 #include <sys/syslog.h> 69 #include <sys/libkern.h> 70 #include <sys/thread2.h> 71 72 #include <net/if.h> 73 #include <net/if_types.h> 74 #include <net/netisr.h> 75 #include <net/bpf.h> 76 77 #include <netinet/in.h> 78 79 #include <netgraph/ng_message.h> 80 #include <netgraph/netgraph.h> 81 #include <netgraph/ng_parse.h> 82 #include "ng_iface.h" 83 #include <netgraph/cisco/ng_cisco.h> 84 85 /* This struct describes one address family */ 86 struct iffam { 87 sa_family_t family; /* Address family */ 88 const char *hookname; /* Name for hook */ 89 }; 90 typedef const struct iffam *iffam_p; 91 92 /* List of address families supported by our interface */ 93 static const struct iffam gFamilies[] = { 94 { AF_INET, NG_IFACE_HOOK_INET }, 95 { AF_INET6, NG_IFACE_HOOK_INET6 }, 96 { AF_APPLETALK, NG_IFACE_HOOK_ATALK }, 97 { AF_IPX, NG_IFACE_HOOK_IPX }, 98 { AF_ATM, NG_IFACE_HOOK_ATM }, 99 { AF_NATM, NG_IFACE_HOOK_NATM }, 100 { AF_NS, NG_IFACE_HOOK_NS }, 101 }; 102 #define NUM_FAMILIES (sizeof(gFamilies) / sizeof(*gFamilies)) 103 104 /* Node private data */ 105 struct ng_iface_private { 106 struct ifnet *ifp; /* Our interface */ 107 int unit; /* Interface unit number */ 108 node_p node; /* Our netgraph node */ 109 hook_p hooks[NUM_FAMILIES]; /* Hook for each address family */ 110 }; 111 typedef struct ng_iface_private *priv_p; 112 113 /* Interface methods */ 114 static void ng_iface_start(struct ifnet *ifp); 115 static int ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data, 116 struct ucred *cr); 117 static int ng_iface_output(struct ifnet *ifp, struct mbuf *m0, 118 struct sockaddr *dst, struct rtentry *rt0); 119 static void ng_iface_bpftap(struct ifnet *ifp, 120 struct mbuf *m, sa_family_t family); 121 #ifdef DEBUG 122 static void ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data); 123 #endif 124 125 /* Netgraph methods */ 126 static ng_constructor_t ng_iface_constructor; 127 static ng_rcvmsg_t ng_iface_rcvmsg; 128 static ng_shutdown_t ng_iface_rmnode; 129 static ng_newhook_t ng_iface_newhook; 130 static ng_rcvdata_t ng_iface_rcvdata; 131 static ng_disconnect_t ng_iface_disconnect; 132 133 /* Helper stuff */ 134 static iffam_p get_iffam_from_af(sa_family_t family); 135 static iffam_p get_iffam_from_hook(priv_p priv, hook_p hook); 136 static iffam_p get_iffam_from_name(const char *name); 137 static hook_p *get_hook_from_iffam(priv_p priv, iffam_p iffam); 138 139 /* Parse type for struct ng_iface_ifname */ 140 static const struct ng_parse_fixedstring_info ng_iface_ifname_info = { 141 NG_IFACE_IFACE_NAME_MAX + 1 142 }; 143 static const struct ng_parse_type ng_iface_ifname_type = { 144 &ng_parse_fixedstring_type, 145 &ng_iface_ifname_info 146 }; 147 148 /* Parse type for struct ng_cisco_ipaddr */ 149 static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[] 150 = NG_CISCO_IPADDR_TYPE_INFO; 151 static const struct ng_parse_type ng_cisco_ipaddr_type = { 152 &ng_parse_struct_type, 153 &ng_cisco_ipaddr_type_fields 154 }; 155 156 /* List of commands and how to convert arguments to/from ASCII */ 157 static const struct ng_cmdlist ng_iface_cmds[] = { 158 { 159 NGM_IFACE_COOKIE, 160 NGM_IFACE_GET_IFNAME, 161 "getifname", 162 NULL, 163 &ng_iface_ifname_type 164 }, 165 { 166 NGM_IFACE_COOKIE, 167 NGM_IFACE_POINT2POINT, 168 "point2point", 169 NULL, 170 NULL 171 }, 172 { 173 NGM_IFACE_COOKIE, 174 NGM_IFACE_BROADCAST, 175 "broadcast", 176 NULL, 177 NULL 178 }, 179 { 180 NGM_CISCO_COOKIE, 181 NGM_CISCO_GET_IPADDR, 182 "getipaddr", 183 NULL, 184 &ng_cisco_ipaddr_type 185 }, 186 { 0 } 187 }; 188 189 /* Node type descriptor */ 190 static struct ng_type typestruct = { 191 NG_VERSION, 192 NG_IFACE_NODE_TYPE, 193 NULL, 194 ng_iface_constructor, 195 ng_iface_rcvmsg, 196 ng_iface_rmnode, 197 ng_iface_newhook, 198 NULL, 199 NULL, 200 ng_iface_rcvdata, 201 ng_iface_rcvdata, 202 ng_iface_disconnect, 203 ng_iface_cmds 204 }; 205 NETGRAPH_INIT(iface, &typestruct); 206 207 /* We keep a bitmap indicating which unit numbers are free. 208 One means the unit number is free, zero means it's taken. */ 209 static int *ng_iface_units = NULL; 210 static int ng_iface_units_len = 0; 211 212 #define UNITS_BITSPERWORD (sizeof(*ng_iface_units) * NBBY) 213 214 /************************************************************************ 215 HELPER STUFF 216 ************************************************************************/ 217 218 /* 219 * Get the family descriptor from the family ID 220 */ 221 static __inline__ iffam_p 222 get_iffam_from_af(sa_family_t family) 223 { 224 iffam_p iffam; 225 int k; 226 227 for (k = 0; k < NUM_FAMILIES; k++) { 228 iffam = &gFamilies[k]; 229 if (iffam->family == family) 230 return (iffam); 231 } 232 return (NULL); 233 } 234 235 /* 236 * Get the family descriptor from the hook 237 */ 238 static __inline__ iffam_p 239 get_iffam_from_hook(priv_p priv, hook_p hook) 240 { 241 int k; 242 243 for (k = 0; k < NUM_FAMILIES; k++) 244 if (priv->hooks[k] == hook) 245 return (&gFamilies[k]); 246 return (NULL); 247 } 248 249 /* 250 * Get the hook from the iffam descriptor 251 */ 252 253 static __inline__ hook_p * 254 get_hook_from_iffam(priv_p priv, iffam_p iffam) 255 { 256 return (&priv->hooks[iffam - gFamilies]); 257 } 258 259 /* 260 * Get the iffam descriptor from the name 261 */ 262 static __inline__ iffam_p 263 get_iffam_from_name(const char *name) 264 { 265 iffam_p iffam; 266 int k; 267 268 for (k = 0; k < NUM_FAMILIES; k++) { 269 iffam = &gFamilies[k]; 270 if (!strcmp(iffam->hookname, name)) 271 return (iffam); 272 } 273 return (NULL); 274 } 275 276 /* 277 * Find the first free unit number for a new interface. 278 * Increase the size of the unit bitmap as necessary. 279 */ 280 static __inline__ int 281 ng_iface_get_unit(int *unit) 282 { 283 int index, bit; 284 285 for (index = 0; index < ng_iface_units_len 286 && ng_iface_units[index] == 0; index++); 287 if (index == ng_iface_units_len) { /* extend array */ 288 int i, *newarray, newlen; 289 290 newlen = (2 * ng_iface_units_len) + 4; 291 MALLOC(newarray, int *, newlen * sizeof(*ng_iface_units), 292 M_NETGRAPH, M_NOWAIT); 293 if (newarray == NULL) 294 return (ENOMEM); 295 bcopy(ng_iface_units, newarray, 296 ng_iface_units_len * sizeof(*ng_iface_units)); 297 for (i = ng_iface_units_len; i < newlen; i++) 298 newarray[i] = ~0; 299 if (ng_iface_units != NULL) 300 FREE(ng_iface_units, M_NETGRAPH); 301 ng_iface_units = newarray; 302 ng_iface_units_len = newlen; 303 } 304 bit = ffs(ng_iface_units[index]) - 1; 305 KASSERT(bit >= 0 && bit <= UNITS_BITSPERWORD - 1, 306 ("%s: word=%d bit=%d", __func__, ng_iface_units[index], bit)); 307 ng_iface_units[index] &= ~(1 << bit); 308 *unit = (index * UNITS_BITSPERWORD) + bit; 309 return (0); 310 } 311 312 /* 313 * Free a no longer needed unit number. 314 */ 315 static __inline__ void 316 ng_iface_free_unit(int unit) 317 { 318 int index, bit; 319 320 index = unit / UNITS_BITSPERWORD; 321 bit = unit % UNITS_BITSPERWORD; 322 KASSERT(index < ng_iface_units_len, 323 ("%s: unit=%d len=%d", __func__, unit, ng_iface_units_len)); 324 KASSERT((ng_iface_units[index] & (1 << bit)) == 0, 325 ("%s: unit=%d is free", __func__, unit)); 326 ng_iface_units[index] |= (1 << bit); 327 /* 328 * XXX We could think about reducing the size of ng_iface_units[] 329 * XXX here if the last portion is all ones 330 */ 331 } 332 333 /************************************************************************ 334 INTERFACE STUFF 335 ************************************************************************/ 336 337 /* 338 * Process an ioctl for the virtual interface 339 */ 340 static int 341 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data, 342 struct ucred *cr) 343 { 344 struct ifreq *const ifr = (struct ifreq *) data; 345 int error = 0; 346 347 #ifdef DEBUG 348 ng_iface_print_ioctl(ifp, command, data); 349 #endif 350 crit_enter(); 351 switch (command) { 352 353 /* These two are mostly handled at a higher layer */ 354 case SIOCSIFADDR: 355 ifp->if_flags |= (IFF_UP | IFF_RUNNING); 356 ifp->if_flags &= ~(IFF_OACTIVE); 357 break; 358 case SIOCGIFADDR: 359 break; 360 361 /* Set flags */ 362 case SIOCSIFFLAGS: 363 /* 364 * If the interface is marked up and stopped, then start it. 365 * If it is marked down and running, then stop it. 366 */ 367 if (ifr->ifr_flags & IFF_UP) { 368 if (!(ifp->if_flags & IFF_RUNNING)) { 369 ifp->if_flags &= ~(IFF_OACTIVE); 370 ifp->if_flags |= IFF_RUNNING; 371 } 372 } else { 373 if (ifp->if_flags & IFF_RUNNING) 374 ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE); 375 } 376 break; 377 378 /* Set the interface MTU */ 379 case SIOCSIFMTU: 380 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX 381 || ifr->ifr_mtu < NG_IFACE_MTU_MIN) 382 error = EINVAL; 383 else 384 ifp->if_mtu = ifr->ifr_mtu; 385 break; 386 387 /* Stuff that's not supported */ 388 case SIOCADDMULTI: 389 case SIOCDELMULTI: 390 error = 0; 391 break; 392 case SIOCSIFPHYS: 393 error = EOPNOTSUPP; 394 break; 395 396 default: 397 error = EINVAL; 398 break; 399 } 400 crit_exit(); 401 return (error); 402 } 403 404 /* 405 * This routine is called to deliver a packet out the interface. 406 * We simply look at the address family and relay the packet to 407 * the corresponding hook, if it exists and is connected. 408 */ 409 410 static int 411 ng_iface_output_serialized(struct ifnet *ifp, struct mbuf *m, 412 struct sockaddr *dst, struct rtentry *rt0) 413 { 414 const priv_p priv = (priv_p) ifp->if_softc; 415 const iffam_p iffam = get_iffam_from_af(dst->sa_family); 416 meta_p meta = NULL; 417 int len, error = 0; 418 419 /* Check interface flags */ 420 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { 421 m_freem(m); 422 return (ENETDOWN); 423 } 424 425 /* BPF writes need to be handled specially */ 426 if (dst->sa_family == AF_UNSPEC) { 427 if (m->m_len < 4 && (m = m_pullup(m, 4)) == NULL) 428 return (ENOBUFS); 429 dst->sa_family = (sa_family_t)*mtod(m, int32_t *); 430 m->m_data += 4; 431 m->m_len -= 4; 432 m->m_pkthdr.len -= 4; 433 } 434 435 /* Berkeley packet filter */ 436 ng_iface_bpftap(ifp, m, dst->sa_family); 437 438 /* Check address family to determine hook (if known) */ 439 if (iffam == NULL) { 440 m_freem(m); 441 log(LOG_WARNING, "%s: can't handle af%d\n", 442 ifp->if_xname, (int)dst->sa_family); 443 return (EAFNOSUPPORT); 444 } 445 446 /* Copy length before the mbuf gets invalidated */ 447 len = m->m_pkthdr.len; 448 449 /* Send packet; if hook is not connected, mbuf will get freed. */ 450 NG_SEND_DATA(error, *get_hook_from_iffam(priv, iffam), m, meta); 451 452 /* Update stats */ 453 if (error == 0) { 454 ifp->if_obytes += len; 455 ifp->if_opackets++; 456 } 457 return (error); 458 } 459 460 static int 461 ng_iface_output(struct ifnet *ifp, struct mbuf *m, 462 struct sockaddr *dst, struct rtentry *rt0) 463 { 464 int error; 465 466 ifnet_serialize_tx(ifp); 467 error = ng_iface_output_serialized(ifp, m, dst, rt0); 468 ifnet_deserialize_tx(ifp); 469 470 return error; 471 } 472 473 /* 474 * This routine should never be called 475 */ 476 477 static void 478 ng_iface_start(struct ifnet *ifp) 479 { 480 kprintf("%s: %s called?", ifp->if_xname, __func__); 481 } 482 483 /* 484 * Flash a packet by the BPF (requires prepending 4 byte AF header) 485 */ 486 static void 487 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family) 488 { 489 int32_t family4 = (int32_t)family; 490 491 KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__)); 492 493 if (ifp->if_bpf) 494 bpf_ptap(ifp->if_bpf, m, &family, sizeof(family4)); 495 } 496 497 #ifdef DEBUG 498 /* 499 * Display an ioctl to the virtual interface 500 */ 501 502 static void 503 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data) 504 { 505 char *str; 506 507 switch (command & IOC_DIRMASK) { 508 case IOC_VOID: 509 str = "IO"; 510 break; 511 case IOC_OUT: 512 str = "IOR"; 513 break; 514 case IOC_IN: 515 str = "IOW"; 516 break; 517 case IOC_INOUT: 518 str = "IORW"; 519 break; 520 default: 521 str = "IO??"; 522 } 523 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n", 524 ifp->if_xname, 525 str, 526 IOCGROUP(command), 527 command & 0xff, 528 IOCPARM_LEN(command)); 529 } 530 #endif /* DEBUG */ 531 532 /************************************************************************ 533 NETGRAPH NODE STUFF 534 ************************************************************************/ 535 536 /* 537 * Constructor for a node 538 */ 539 static int 540 ng_iface_constructor(node_p *nodep) 541 { 542 char ifname[NG_IFACE_IFACE_NAME_MAX + 1]; 543 struct ifnet *ifp; 544 node_p node; 545 priv_p priv; 546 int error = 0; 547 548 /* Allocate node and interface private structures */ 549 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO); 550 if (priv == NULL) 551 return (ENOMEM); 552 MALLOC(ifp, struct ifnet *, sizeof(*ifp), M_NETGRAPH, M_NOWAIT | M_ZERO); 553 if (ifp == NULL) { 554 FREE(priv, M_NETGRAPH); 555 return (ENOMEM); 556 } 557 558 /* Link them together */ 559 ifp->if_softc = priv; 560 priv->ifp = ifp; 561 562 /* Get an interface unit number */ 563 if ((error = ng_iface_get_unit(&priv->unit)) != 0) { 564 FREE(ifp, M_NETGRAPH); 565 FREE(priv, M_NETGRAPH); 566 return (error); 567 } 568 569 /* Call generic node constructor */ 570 if ((error = ng_make_node_common(&typestruct, nodep)) != 0) { 571 ng_iface_free_unit(priv->unit); 572 FREE(ifp, M_NETGRAPH); 573 FREE(priv, M_NETGRAPH); 574 return (error); 575 } 576 node = *nodep; 577 578 /* Link together node and private info */ 579 node->private = priv; 580 priv->node = node; 581 582 /* Initialize interface structure */ 583 if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit); 584 ifp->if_output = ng_iface_output; 585 ifp->if_start = ng_iface_start; 586 ifp->if_ioctl = ng_iface_ioctl; 587 ifp->if_watchdog = NULL; 588 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN; 589 ifp->if_mtu = NG_IFACE_MTU_DEFAULT; 590 ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST); 591 ifp->if_type = IFT_PROPVIRTUAL; /* XXX */ 592 ifp->if_addrlen = 0; /* XXX */ 593 ifp->if_hdrlen = 0; /* XXX */ 594 ifp->if_baudrate = 64000; /* XXX */ 595 596 /* Give this node the same name as the interface (if possible) */ 597 bzero(ifname, sizeof(ifname)); 598 strlcpy(ifname, ifp->if_xname, sizeof(ifname)); 599 if (ng_name_node(node, ifname) != 0) 600 log(LOG_WARNING, "%s: can't acquire netgraph name\n", ifname); 601 602 /* Attach the interface */ 603 if_attach(ifp, NULL); 604 bpfattach(ifp, DLT_NULL, sizeof(u_int)); 605 606 /* Done */ 607 return (0); 608 } 609 610 /* 611 * Give our ok for a hook to be added 612 */ 613 static int 614 ng_iface_newhook(node_p node, hook_p hook, const char *name) 615 { 616 const iffam_p iffam = get_iffam_from_name(name); 617 hook_p *hookptr; 618 619 if (iffam == NULL) 620 return (EPFNOSUPPORT); 621 hookptr = get_hook_from_iffam((priv_p) node->private, iffam); 622 if (*hookptr != NULL) 623 return (EISCONN); 624 *hookptr = hook; 625 return (0); 626 } 627 628 /* 629 * Receive a control message 630 */ 631 static int 632 ng_iface_rcvmsg(node_p node, struct ng_mesg *msg, 633 const char *retaddr, struct ng_mesg **rptr) 634 { 635 const priv_p priv = node->private; 636 struct ifnet *const ifp = priv->ifp; 637 struct ng_mesg *resp = NULL; 638 int error = 0; 639 640 switch (msg->header.typecookie) { 641 case NGM_IFACE_COOKIE: 642 switch (msg->header.cmd) { 643 case NGM_IFACE_GET_IFNAME: 644 { 645 struct ng_iface_ifname *arg; 646 647 NG_MKRESPONSE(resp, msg, sizeof(*arg), M_NOWAIT); 648 if (resp == NULL) { 649 error = ENOMEM; 650 break; 651 } 652 arg = (struct ng_iface_ifname *)resp->data; 653 strlcpy(arg->ngif_name, ifp->if_xname, 654 sizeof(arg->ngif_name)); 655 break; 656 } 657 658 case NGM_IFACE_POINT2POINT: 659 case NGM_IFACE_BROADCAST: 660 { 661 662 /* Deny request if interface is UP */ 663 if ((ifp->if_flags & IFF_UP) != 0) 664 return (EBUSY); 665 666 /* Change flags */ 667 switch (msg->header.cmd) { 668 case NGM_IFACE_POINT2POINT: 669 ifp->if_flags |= IFF_POINTOPOINT; 670 ifp->if_flags &= ~IFF_BROADCAST; 671 break; 672 case NGM_IFACE_BROADCAST: 673 ifp->if_flags &= ~IFF_POINTOPOINT; 674 ifp->if_flags |= IFF_BROADCAST; 675 break; 676 } 677 break; 678 } 679 680 default: 681 error = EINVAL; 682 break; 683 } 684 break; 685 case NGM_CISCO_COOKIE: 686 switch (msg->header.cmd) { 687 case NGM_CISCO_GET_IPADDR: /* we understand this too */ 688 { 689 struct ifaddr_container *ifac; 690 691 /* Return the first configured IP address */ 692 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], 693 ifa_link) { 694 struct ifaddr *ifa = ifac->ifa; 695 struct ng_cisco_ipaddr *ips; 696 697 if (ifa->ifa_addr->sa_family != AF_INET) 698 continue; 699 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT); 700 if (resp == NULL) { 701 error = ENOMEM; 702 break; 703 } 704 ips = (struct ng_cisco_ipaddr *)resp->data; 705 ips->ipaddr = ((struct sockaddr_in *) 706 ifa->ifa_addr)->sin_addr; 707 ips->netmask = ((struct sockaddr_in *) 708 ifa->ifa_netmask)->sin_addr; 709 break; 710 } 711 712 /* No IP addresses on this interface? */ 713 if (ifac == NULL) 714 error = EADDRNOTAVAIL; 715 break; 716 } 717 default: 718 error = EINVAL; 719 break; 720 } 721 break; 722 default: 723 error = EINVAL; 724 break; 725 } 726 if (rptr) 727 *rptr = resp; 728 else if (resp) 729 FREE(resp, M_NETGRAPH); 730 FREE(msg, M_NETGRAPH); 731 return (error); 732 } 733 734 /* 735 * Recive data from a hook. Pass the packet to the correct input routine. 736 */ 737 static int 738 ng_iface_rcvdata(hook_p hook, struct mbuf *m, meta_p meta) 739 { 740 const priv_p priv = hook->node->private; 741 const iffam_p iffam = get_iffam_from_hook(priv, hook); 742 struct ifnet *const ifp = priv->ifp; 743 int isr; 744 745 /* Sanity checks */ 746 KASSERT(iffam != NULL, ("%s: iffam", __func__)); 747 KASSERT(m->m_flags & M_PKTHDR, ("%s: not pkthdr", __func__)); 748 if (m == NULL) 749 return (EINVAL); 750 if ((ifp->if_flags & IFF_UP) == 0) { 751 NG_FREE_DATA(m, meta); 752 return (ENETDOWN); 753 } 754 755 /* Update interface stats */ 756 ifp->if_ipackets++; 757 ifp->if_ibytes += m->m_pkthdr.len; 758 759 /* Note receiving interface */ 760 m->m_pkthdr.rcvif = ifp; 761 762 /* Berkeley packet filter */ 763 ng_iface_bpftap(ifp, m, iffam->family); 764 765 /* Ignore any meta-data */ 766 NG_FREE_META(meta); 767 768 /* Send packet */ 769 switch (iffam->family) { 770 #ifdef INET 771 case AF_INET: 772 isr = NETISR_IP; 773 break; 774 #endif 775 #ifdef INET6 776 case AF_INET6: 777 isr = NETISR_IPV6; 778 break; 779 #endif 780 #ifdef IPX 781 case AF_IPX: 782 isr = NETISR_IPX; 783 break; 784 #endif 785 #ifdef NETATALK 786 case AF_APPLETALK: 787 isr = NETISR_ATALK2; 788 break; 789 #endif 790 default: 791 m_freem(m); 792 return (EAFNOSUPPORT); 793 } 794 netisr_queue(isr, m); 795 return (0); 796 } 797 798 /* 799 * Shutdown and remove the node and its associated interface. 800 */ 801 static int 802 ng_iface_rmnode(node_p node) 803 { 804 const priv_p priv = node->private; 805 806 ng_cutlinks(node); 807 ng_unname(node); 808 bpfdetach(priv->ifp); 809 if_detach(priv->ifp); 810 FREE(priv->ifp, M_NETGRAPH); 811 priv->ifp = NULL; 812 ng_iface_free_unit(priv->unit); 813 FREE(priv, M_NETGRAPH); 814 node->private = NULL; 815 ng_unref(node); 816 return (0); 817 } 818 819 /* 820 * Hook disconnection. Note that we do *not* shutdown when all 821 * hooks have been disconnected. 822 */ 823 static int 824 ng_iface_disconnect(hook_p hook) 825 { 826 const priv_p priv = hook->node->private; 827 const iffam_p iffam = get_iffam_from_hook(priv, hook); 828 829 if (iffam == NULL) 830 panic(__func__); 831 *get_hook_from_iffam(priv, iffam) = NULL; 832 return (0); 833 } 834 835