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_inet.h" 55 #include "opt_inet6.h" 56 #include "opt_ipx.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/sockio.h> 65 #include <sys/socket.h> 66 #include <sys/syslog.h> 67 #include <sys/libkern.h> 68 #include <sys/thread2.h> 69 70 #include <net/if.h> 71 #include <net/if_types.h> 72 #include <net/ifq_var.h> 73 #include <net/netisr.h> 74 #include <net/bpf.h> 75 76 #include <netinet/in.h> 77 78 #include <netgraph/ng_message.h> 79 #include <netgraph/netgraph.h> 80 #include <netgraph/ng_parse.h> 81 #include "ng_iface.h" 82 #include <netgraph/cisco/ng_cisco.h> 83 84 /* This struct describes one address family */ 85 struct iffam { 86 sa_family_t family; /* Address family */ 87 const char *hookname; /* Name for hook */ 88 }; 89 typedef const struct iffam *iffam_p; 90 91 /* List of address families supported by our interface */ 92 static const struct iffam gFamilies[] = { 93 { AF_INET, NG_IFACE_HOOK_INET }, 94 { AF_INET6, NG_IFACE_HOOK_INET6 }, 95 { AF_IPX, NG_IFACE_HOOK_IPX }, 96 { AF_ATM, NG_IFACE_HOOK_ATM }, 97 { AF_NATM, NG_IFACE_HOOK_NATM }, 98 { AF_NS, NG_IFACE_HOOK_NS }, 99 }; 100 #define NUM_FAMILIES NELEM(gFamilies) 101 102 /* Node private data */ 103 struct ng_iface_private { 104 struct ifnet *ifp; /* Our interface */ 105 int unit; /* Interface unit number */ 106 node_p node; /* Our netgraph node */ 107 hook_p hooks[NUM_FAMILIES]; /* Hook for each address family */ 108 }; 109 typedef struct ng_iface_private *priv_p; 110 111 /* Interface methods */ 112 static void ng_iface_start(struct ifnet *ifp, struct ifaltq_subque *); 113 static int ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data, 114 struct ucred *cr); 115 static int ng_iface_output(struct ifnet *ifp, struct mbuf *m0, 116 struct sockaddr *dst, struct rtentry *rt0); 117 static void ng_iface_bpftap(struct ifnet *ifp, 118 struct mbuf *m, sa_family_t family); 119 #ifdef DEBUG 120 static void ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data); 121 #endif 122 123 /* Netgraph methods */ 124 static ng_constructor_t ng_iface_constructor; 125 static ng_rcvmsg_t ng_iface_rcvmsg; 126 static ng_shutdown_t ng_iface_rmnode; 127 static ng_newhook_t ng_iface_newhook; 128 static ng_rcvdata_t ng_iface_rcvdata; 129 static ng_disconnect_t ng_iface_disconnect; 130 131 /* Helper stuff */ 132 static iffam_p get_iffam_from_af(sa_family_t family); 133 static iffam_p get_iffam_from_hook(priv_p priv, hook_p hook); 134 static iffam_p get_iffam_from_name(const char *name); 135 static hook_p *get_hook_from_iffam(priv_p priv, iffam_p iffam); 136 137 /* Parse type for struct ng_iface_ifname */ 138 static const struct ng_parse_fixedstring_info ng_iface_ifname_info = { 139 NG_IFACE_IFACE_NAME_MAX + 1 140 }; 141 static const struct ng_parse_type ng_iface_ifname_type = { 142 &ng_parse_fixedstring_type, 143 &ng_iface_ifname_info 144 }; 145 146 /* Parse type for struct ng_cisco_ipaddr */ 147 static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[] 148 = NG_CISCO_IPADDR_TYPE_INFO; 149 static const struct ng_parse_type ng_cisco_ipaddr_type = { 150 &ng_parse_struct_type, 151 &ng_cisco_ipaddr_type_fields 152 }; 153 154 /* List of commands and how to convert arguments to/from ASCII */ 155 static const struct ng_cmdlist ng_iface_cmds[] = { 156 { 157 NGM_IFACE_COOKIE, 158 NGM_IFACE_GET_IFNAME, 159 "getifname", 160 NULL, 161 &ng_iface_ifname_type 162 }, 163 { 164 NGM_IFACE_COOKIE, 165 NGM_IFACE_POINT2POINT, 166 "point2point", 167 NULL, 168 NULL 169 }, 170 { 171 NGM_IFACE_COOKIE, 172 NGM_IFACE_BROADCAST, 173 "broadcast", 174 NULL, 175 NULL 176 }, 177 { 178 NGM_CISCO_COOKIE, 179 NGM_CISCO_GET_IPADDR, 180 "getipaddr", 181 NULL, 182 &ng_cisco_ipaddr_type 183 }, 184 { 0 } 185 }; 186 187 /* Node type descriptor */ 188 static struct ng_type typestruct = { 189 NG_VERSION, 190 NG_IFACE_NODE_TYPE, 191 NULL, 192 ng_iface_constructor, 193 ng_iface_rcvmsg, 194 ng_iface_rmnode, 195 ng_iface_newhook, 196 NULL, 197 NULL, 198 ng_iface_rcvdata, 199 ng_iface_rcvdata, 200 ng_iface_disconnect, 201 ng_iface_cmds 202 }; 203 NETGRAPH_INIT(iface, &typestruct); 204 205 /* We keep a bitmap indicating which unit numbers are free. 206 One means the unit number is free, zero means it's taken. */ 207 static int *ng_iface_units = NULL; 208 static int ng_iface_units_len = 0; 209 210 #define UNITS_BITSPERWORD (sizeof(*ng_iface_units) * NBBY) 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 * Find the first free unit number for a new interface. 276 * Increase the size of the unit bitmap as necessary. 277 */ 278 static __inline__ int 279 ng_iface_get_unit(int *unit) 280 { 281 int index, bit; 282 283 for (index = 0; index < ng_iface_units_len 284 && ng_iface_units[index] == 0; index++); 285 if (index == ng_iface_units_len) { /* extend array */ 286 int i, *newarray, newlen; 287 288 newlen = (2 * ng_iface_units_len) + 4; 289 newarray = kmalloc(newlen * sizeof(*ng_iface_units), 290 M_NETGRAPH, M_NOWAIT); 291 if (newarray == NULL) 292 return (ENOMEM); 293 bcopy(ng_iface_units, newarray, 294 ng_iface_units_len * sizeof(*ng_iface_units)); 295 for (i = ng_iface_units_len; i < newlen; i++) 296 newarray[i] = ~0; 297 if (ng_iface_units != NULL) 298 kfree(ng_iface_units, M_NETGRAPH); 299 ng_iface_units = newarray; 300 ng_iface_units_len = newlen; 301 } 302 bit = ffs(ng_iface_units[index]) - 1; 303 KASSERT(bit >= 0 && bit <= UNITS_BITSPERWORD - 1, 304 ("%s: word=%d bit=%d", __func__, ng_iface_units[index], bit)); 305 ng_iface_units[index] &= ~(1 << bit); 306 *unit = (index * UNITS_BITSPERWORD) + bit; 307 return (0); 308 } 309 310 /* 311 * Free a no longer needed unit number. 312 */ 313 static __inline__ void 314 ng_iface_free_unit(int unit) 315 { 316 int index, bit; 317 318 index = unit / UNITS_BITSPERWORD; 319 bit = unit % UNITS_BITSPERWORD; 320 KASSERT(index < ng_iface_units_len, 321 ("%s: unit=%d len=%d", __func__, unit, ng_iface_units_len)); 322 KASSERT((ng_iface_units[index] & (1 << bit)) == 0, 323 ("%s: unit=%d is free", __func__, unit)); 324 ng_iface_units[index] |= (1 << bit); 325 /* 326 * XXX We could think about reducing the size of ng_iface_units[] 327 * XXX here if the last portion is all ones 328 */ 329 } 330 331 /************************************************************************ 332 INTERFACE STUFF 333 ************************************************************************/ 334 335 /* 336 * Process an ioctl for the virtual interface 337 */ 338 static int 339 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data, 340 struct ucred *cr) 341 { 342 struct ifreq *const ifr = (struct ifreq *) data; 343 int error = 0; 344 345 #ifdef DEBUG 346 ng_iface_print_ioctl(ifp, command, data); 347 #endif 348 crit_enter(); 349 switch (command) { 350 351 /* These two are mostly handled at a higher layer */ 352 case SIOCSIFADDR: 353 ifp->if_flags |= (IFF_UP | IFF_RUNNING); 354 ifq_clr_oactive(&ifp->if_snd); 355 break; 356 case SIOCGIFADDR: 357 break; 358 359 /* Set flags */ 360 case SIOCSIFFLAGS: 361 /* 362 * If the interface is marked up and stopped, then start it. 363 * If it is marked down and running, then stop it. 364 */ 365 if (ifr->ifr_flags & IFF_UP) { 366 if (!(ifp->if_flags & IFF_RUNNING)) { 367 ifq_clr_oactive(&ifp->if_snd); 368 ifp->if_flags |= IFF_RUNNING; 369 } 370 } else { 371 if (ifp->if_flags & IFF_RUNNING) { 372 ifp->if_flags &= ~IFF_RUNNING; 373 ifq_clr_oactive(&ifp->if_snd); 374 } 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 IFNET_STAT_INC(ifp, obytes, len); 455 IFNET_STAT_INC(ifp, opackets, 1); 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 struct ifaltq_subque *ifsq = ifq_get_subq_default(&ifp->if_snd); 465 int error; 466 467 ifsq_serialize_hw(ifsq); 468 error = ng_iface_output_serialized(ifp, m, dst, rt0); 469 ifsq_deserialize_hw(ifsq); 470 471 return error; 472 } 473 474 /* 475 * This routine should never be called 476 */ 477 478 static void 479 ng_iface_start(struct ifnet *ifp, struct ifaltq_subque *ifsq __unused) 480 { 481 kprintf("%s: %s called?", ifp->if_xname, __func__); 482 } 483 484 /* 485 * Flash a packet by the BPF (requires prepending 4 byte AF header) 486 */ 487 static void 488 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family) 489 { 490 int32_t family4 = (int32_t)family; 491 492 KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__)); 493 494 if (ifp->if_bpf) { 495 bpf_gettoken(); 496 if (ifp->if_bpf) 497 bpf_ptap(ifp->if_bpf, m, &family, sizeof(family4)); 498 bpf_reltoken(); 499 } 500 } 501 502 #ifdef DEBUG 503 /* 504 * Display an ioctl to the virtual interface 505 */ 506 507 static void 508 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data) 509 { 510 char *str; 511 512 switch (command & IOC_DIRMASK) { 513 case IOC_VOID: 514 str = "IO"; 515 break; 516 case IOC_OUT: 517 str = "IOR"; 518 break; 519 case IOC_IN: 520 str = "IOW"; 521 break; 522 case IOC_INOUT: 523 str = "IORW"; 524 break; 525 default: 526 str = "IO??"; 527 } 528 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n", 529 ifp->if_xname, 530 str, 531 IOCGROUP(command), 532 command & 0xff, 533 IOCPARM_LEN(command)); 534 } 535 #endif /* DEBUG */ 536 537 /************************************************************************ 538 NETGRAPH NODE STUFF 539 ************************************************************************/ 540 541 /* 542 * Constructor for a node 543 */ 544 static int 545 ng_iface_constructor(node_p *nodep) 546 { 547 char ifname[NG_IFACE_IFACE_NAME_MAX + 1]; 548 struct ifnet *ifp; 549 node_p node; 550 priv_p priv; 551 int error = 0; 552 553 /* Allocate node and interface private structures */ 554 priv = kmalloc(sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO); 555 if (priv == NULL) 556 return (ENOMEM); 557 ifp = kmalloc(sizeof(*ifp), M_NETGRAPH, M_NOWAIT | M_ZERO); 558 if (ifp == NULL) { 559 kfree(priv, M_NETGRAPH); 560 return (ENOMEM); 561 } 562 563 /* Link them together */ 564 ifp->if_softc = priv; 565 priv->ifp = ifp; 566 567 /* Get an interface unit number */ 568 if ((error = ng_iface_get_unit(&priv->unit)) != 0) { 569 kfree(ifp, M_NETGRAPH); 570 kfree(priv, M_NETGRAPH); 571 return (error); 572 } 573 574 /* Call generic node constructor */ 575 if ((error = ng_make_node_common(&typestruct, nodep)) != 0) { 576 ng_iface_free_unit(priv->unit); 577 kfree(ifp, M_NETGRAPH); 578 kfree(priv, M_NETGRAPH); 579 return (error); 580 } 581 node = *nodep; 582 583 /* Link together node and private info */ 584 node->private = priv; 585 priv->node = node; 586 587 /* Initialize interface structure */ 588 if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit); 589 ifp->if_output = ng_iface_output; 590 ifp->if_start = ng_iface_start; 591 ifp->if_ioctl = ng_iface_ioctl; 592 ifp->if_watchdog = NULL; 593 ifq_set_maxlen(&ifp->if_snd, IFQ_MAXLEN); 594 ifp->if_mtu = NG_IFACE_MTU_DEFAULT; 595 ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST); 596 ifp->if_type = IFT_PROPVIRTUAL; /* XXX */ 597 ifp->if_addrlen = 0; /* XXX */ 598 ifp->if_hdrlen = 0; /* XXX */ 599 ifp->if_baudrate = 64000; /* XXX */ 600 601 /* Give this node the same name as the interface (if possible) */ 602 bzero(ifname, sizeof(ifname)); 603 strlcpy(ifname, ifp->if_xname, sizeof(ifname)); 604 if (ng_name_node(node, ifname) != 0) 605 log(LOG_WARNING, "%s: can't acquire netgraph name\n", ifname); 606 607 /* Attach the interface */ 608 if_attach(ifp, NULL); 609 bpfattach(ifp, DLT_NULL, sizeof(u_int)); 610 611 /* Done */ 612 return (0); 613 } 614 615 /* 616 * Give our ok for a hook to be added 617 */ 618 static int 619 ng_iface_newhook(node_p node, hook_p hook, const char *name) 620 { 621 const iffam_p iffam = get_iffam_from_name(name); 622 hook_p *hookptr; 623 624 if (iffam == NULL) 625 return (EPFNOSUPPORT); 626 hookptr = get_hook_from_iffam((priv_p) node->private, iffam); 627 if (*hookptr != NULL) 628 return (EISCONN); 629 *hookptr = hook; 630 return (0); 631 } 632 633 /* 634 * Receive a control message 635 */ 636 static int 637 ng_iface_rcvmsg(node_p node, struct ng_mesg *msg, 638 const char *retaddr, struct ng_mesg **rptr) 639 { 640 const priv_p priv = node->private; 641 struct ifnet *const ifp = priv->ifp; 642 struct ng_mesg *resp = NULL; 643 int error = 0; 644 645 switch (msg->header.typecookie) { 646 case NGM_IFACE_COOKIE: 647 switch (msg->header.cmd) { 648 case NGM_IFACE_GET_IFNAME: 649 { 650 struct ng_iface_ifname *arg; 651 652 NG_MKRESPONSE(resp, msg, sizeof(*arg), M_NOWAIT); 653 if (resp == NULL) { 654 error = ENOMEM; 655 break; 656 } 657 arg = (struct ng_iface_ifname *)resp->data; 658 strlcpy(arg->ngif_name, ifp->if_xname, 659 sizeof(arg->ngif_name)); 660 break; 661 } 662 663 case NGM_IFACE_POINT2POINT: 664 case NGM_IFACE_BROADCAST: 665 { 666 667 /* Deny request if interface is UP */ 668 if ((ifp->if_flags & IFF_UP) != 0) 669 return (EBUSY); 670 671 /* Change flags */ 672 switch (msg->header.cmd) { 673 case NGM_IFACE_POINT2POINT: 674 ifp->if_flags |= IFF_POINTOPOINT; 675 ifp->if_flags &= ~IFF_BROADCAST; 676 break; 677 case NGM_IFACE_BROADCAST: 678 ifp->if_flags &= ~IFF_POINTOPOINT; 679 ifp->if_flags |= IFF_BROADCAST; 680 break; 681 } 682 break; 683 } 684 685 default: 686 error = EINVAL; 687 break; 688 } 689 break; 690 case NGM_CISCO_COOKIE: 691 switch (msg->header.cmd) { 692 case NGM_CISCO_GET_IPADDR: /* we understand this too */ 693 { 694 struct ifaddr_container *ifac; 695 696 /* Return the first configured IP address */ 697 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], 698 ifa_link) { 699 struct ifaddr *ifa = ifac->ifa; 700 struct ng_cisco_ipaddr *ips; 701 702 if (ifa->ifa_addr->sa_family != AF_INET) 703 continue; 704 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT); 705 if (resp == NULL) { 706 error = ENOMEM; 707 break; 708 } 709 ips = (struct ng_cisco_ipaddr *)resp->data; 710 ips->ipaddr = ((struct sockaddr_in *) 711 ifa->ifa_addr)->sin_addr; 712 ips->netmask = ((struct sockaddr_in *) 713 ifa->ifa_netmask)->sin_addr; 714 break; 715 } 716 717 /* No IP addresses on this interface? */ 718 if (ifac == NULL) 719 error = EADDRNOTAVAIL; 720 break; 721 } 722 default: 723 error = EINVAL; 724 break; 725 } 726 break; 727 default: 728 error = EINVAL; 729 break; 730 } 731 if (rptr) 732 *rptr = resp; 733 else if (resp) 734 kfree(resp, M_NETGRAPH); 735 kfree(msg, M_NETGRAPH); 736 return (error); 737 } 738 739 /* 740 * Recive data from a hook. Pass the packet to the correct input routine. 741 */ 742 static int 743 ng_iface_rcvdata(hook_p hook, struct mbuf *m, meta_p meta) 744 { 745 const priv_p priv = hook->node->private; 746 const iffam_p iffam = get_iffam_from_hook(priv, hook); 747 struct ifnet *const ifp = priv->ifp; 748 int isr; 749 750 /* Sanity checks */ 751 KASSERT(iffam != NULL, ("%s: iffam", __func__)); 752 KASSERT(m->m_flags & M_PKTHDR, ("%s: not pkthdr", __func__)); 753 if (m == NULL) 754 return (EINVAL); 755 if ((ifp->if_flags & IFF_UP) == 0) { 756 NG_FREE_DATA(m, meta); 757 return (ENETDOWN); 758 } 759 760 /* Update interface stats */ 761 IFNET_STAT_INC(ifp, ipackets, 1); 762 IFNET_STAT_INC(ifp, ibytes, m->m_pkthdr.len); 763 764 /* Note receiving interface */ 765 m->m_pkthdr.rcvif = ifp; 766 767 /* Berkeley packet filter */ 768 ng_iface_bpftap(ifp, m, iffam->family); 769 770 /* Ignore any meta-data */ 771 NG_FREE_META(meta); 772 773 /* Send packet */ 774 switch (iffam->family) { 775 #ifdef INET 776 case AF_INET: 777 isr = NETISR_IP; 778 break; 779 #endif 780 #ifdef INET6 781 case AF_INET6: 782 isr = NETISR_IPV6; 783 break; 784 #endif 785 #ifdef IPX 786 case AF_IPX: 787 isr = NETISR_IPX; 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 kfree(priv->ifp, M_NETGRAPH); 811 priv->ifp = NULL; 812 ng_iface_free_unit(priv->unit); 813 kfree(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