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/errno.h> 65 #include <sys/sockio.h> 66 #include <sys/socket.h> 67 #include <sys/syslog.h> 68 #include <sys/libkern.h> 69 #include <sys/thread2.h> 70 71 #include <net/if.h> 72 #include <net/if_types.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); 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 ifp->if_flags &= ~(IFF_OACTIVE); 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 ifp->if_flags &= ~(IFF_OACTIVE); 368 ifp->if_flags |= IFF_RUNNING; 369 } 370 } else { 371 if (ifp->if_flags & IFF_RUNNING) 372 ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE); 373 } 374 break; 375 376 /* Set the interface MTU */ 377 case SIOCSIFMTU: 378 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX 379 || ifr->ifr_mtu < NG_IFACE_MTU_MIN) 380 error = EINVAL; 381 else 382 ifp->if_mtu = ifr->ifr_mtu; 383 break; 384 385 /* Stuff that's not supported */ 386 case SIOCADDMULTI: 387 case SIOCDELMULTI: 388 error = 0; 389 break; 390 case SIOCSIFPHYS: 391 error = EOPNOTSUPP; 392 break; 393 394 default: 395 error = EINVAL; 396 break; 397 } 398 crit_exit(); 399 return (error); 400 } 401 402 /* 403 * This routine is called to deliver a packet out the interface. 404 * We simply look at the address family and relay the packet to 405 * the corresponding hook, if it exists and is connected. 406 */ 407 408 static int 409 ng_iface_output_serialized(struct ifnet *ifp, struct mbuf *m, 410 struct sockaddr *dst, struct rtentry *rt0) 411 { 412 const priv_p priv = (priv_p) ifp->if_softc; 413 const iffam_p iffam = get_iffam_from_af(dst->sa_family); 414 meta_p meta = NULL; 415 int len, error = 0; 416 417 /* Check interface flags */ 418 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { 419 m_freem(m); 420 return (ENETDOWN); 421 } 422 423 /* BPF writes need to be handled specially */ 424 if (dst->sa_family == AF_UNSPEC) { 425 if (m->m_len < 4 && (m = m_pullup(m, 4)) == NULL) 426 return (ENOBUFS); 427 dst->sa_family = (sa_family_t)*mtod(m, int32_t *); 428 m->m_data += 4; 429 m->m_len -= 4; 430 m->m_pkthdr.len -= 4; 431 } 432 433 /* Berkeley packet filter */ 434 ng_iface_bpftap(ifp, m, dst->sa_family); 435 436 /* Check address family to determine hook (if known) */ 437 if (iffam == NULL) { 438 m_freem(m); 439 log(LOG_WARNING, "%s: can't handle af%d\n", 440 ifp->if_xname, (int)dst->sa_family); 441 return (EAFNOSUPPORT); 442 } 443 444 /* Copy length before the mbuf gets invalidated */ 445 len = m->m_pkthdr.len; 446 447 /* Send packet; if hook is not connected, mbuf will get freed. */ 448 NG_SEND_DATA(error, *get_hook_from_iffam(priv, iffam), m, meta); 449 450 /* Update stats */ 451 if (error == 0) { 452 ifp->if_obytes += len; 453 ifp->if_opackets++; 454 } 455 return (error); 456 } 457 458 static int 459 ng_iface_output(struct ifnet *ifp, struct mbuf *m, 460 struct sockaddr *dst, struct rtentry *rt0) 461 { 462 int error; 463 464 ifnet_serialize_tx(ifp); 465 error = ng_iface_output_serialized(ifp, m, dst, rt0); 466 ifnet_deserialize_tx(ifp); 467 468 return error; 469 } 470 471 /* 472 * This routine should never be called 473 */ 474 475 static void 476 ng_iface_start(struct ifnet *ifp) 477 { 478 kprintf("%s: %s called?", ifp->if_xname, __func__); 479 } 480 481 /* 482 * Flash a packet by the BPF (requires prepending 4 byte AF header) 483 */ 484 static void 485 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family) 486 { 487 int32_t family4 = (int32_t)family; 488 489 KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__)); 490 491 if (ifp->if_bpf) 492 bpf_ptap(ifp->if_bpf, m, &family, sizeof(family4)); 493 } 494 495 #ifdef DEBUG 496 /* 497 * Display an ioctl to the virtual interface 498 */ 499 500 static void 501 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data) 502 { 503 char *str; 504 505 switch (command & IOC_DIRMASK) { 506 case IOC_VOID: 507 str = "IO"; 508 break; 509 case IOC_OUT: 510 str = "IOR"; 511 break; 512 case IOC_IN: 513 str = "IOW"; 514 break; 515 case IOC_INOUT: 516 str = "IORW"; 517 break; 518 default: 519 str = "IO??"; 520 } 521 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n", 522 ifp->if_xname, 523 str, 524 IOCGROUP(command), 525 command & 0xff, 526 IOCPARM_LEN(command)); 527 } 528 #endif /* DEBUG */ 529 530 /************************************************************************ 531 NETGRAPH NODE STUFF 532 ************************************************************************/ 533 534 /* 535 * Constructor for a node 536 */ 537 static int 538 ng_iface_constructor(node_p *nodep) 539 { 540 char ifname[NG_IFACE_IFACE_NAME_MAX + 1]; 541 struct ifnet *ifp; 542 node_p node; 543 priv_p priv; 544 int error = 0; 545 546 /* Allocate node and interface private structures */ 547 priv = kmalloc(sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO); 548 if (priv == NULL) 549 return (ENOMEM); 550 ifp = kmalloc(sizeof(*ifp), M_NETGRAPH, M_NOWAIT | M_ZERO); 551 if (ifp == NULL) { 552 kfree(priv, M_NETGRAPH); 553 return (ENOMEM); 554 } 555 556 /* Link them together */ 557 ifp->if_softc = priv; 558 priv->ifp = ifp; 559 560 /* Get an interface unit number */ 561 if ((error = ng_iface_get_unit(&priv->unit)) != 0) { 562 kfree(ifp, M_NETGRAPH); 563 kfree(priv, M_NETGRAPH); 564 return (error); 565 } 566 567 /* Call generic node constructor */ 568 if ((error = ng_make_node_common(&typestruct, nodep)) != 0) { 569 ng_iface_free_unit(priv->unit); 570 kfree(ifp, M_NETGRAPH); 571 kfree(priv, M_NETGRAPH); 572 return (error); 573 } 574 node = *nodep; 575 576 /* Link together node and private info */ 577 node->private = priv; 578 priv->node = node; 579 580 /* Initialize interface structure */ 581 if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit); 582 ifp->if_output = ng_iface_output; 583 ifp->if_start = ng_iface_start; 584 ifp->if_ioctl = ng_iface_ioctl; 585 ifp->if_watchdog = NULL; 586 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN; 587 ifp->if_mtu = NG_IFACE_MTU_DEFAULT; 588 ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST); 589 ifp->if_type = IFT_PROPVIRTUAL; /* XXX */ 590 ifp->if_addrlen = 0; /* XXX */ 591 ifp->if_hdrlen = 0; /* XXX */ 592 ifp->if_baudrate = 64000; /* XXX */ 593 594 /* Give this node the same name as the interface (if possible) */ 595 bzero(ifname, sizeof(ifname)); 596 strlcpy(ifname, ifp->if_xname, sizeof(ifname)); 597 if (ng_name_node(node, ifname) != 0) 598 log(LOG_WARNING, "%s: can't acquire netgraph name\n", ifname); 599 600 /* Attach the interface */ 601 if_attach(ifp, NULL); 602 bpfattach(ifp, DLT_NULL, sizeof(u_int)); 603 604 /* Done */ 605 return (0); 606 } 607 608 /* 609 * Give our ok for a hook to be added 610 */ 611 static int 612 ng_iface_newhook(node_p node, hook_p hook, const char *name) 613 { 614 const iffam_p iffam = get_iffam_from_name(name); 615 hook_p *hookptr; 616 617 if (iffam == NULL) 618 return (EPFNOSUPPORT); 619 hookptr = get_hook_from_iffam((priv_p) node->private, iffam); 620 if (*hookptr != NULL) 621 return (EISCONN); 622 *hookptr = hook; 623 return (0); 624 } 625 626 /* 627 * Receive a control message 628 */ 629 static int 630 ng_iface_rcvmsg(node_p node, struct ng_mesg *msg, 631 const char *retaddr, struct ng_mesg **rptr) 632 { 633 const priv_p priv = node->private; 634 struct ifnet *const ifp = priv->ifp; 635 struct ng_mesg *resp = NULL; 636 int error = 0; 637 638 switch (msg->header.typecookie) { 639 case NGM_IFACE_COOKIE: 640 switch (msg->header.cmd) { 641 case NGM_IFACE_GET_IFNAME: 642 { 643 struct ng_iface_ifname *arg; 644 645 NG_MKRESPONSE(resp, msg, sizeof(*arg), M_NOWAIT); 646 if (resp == NULL) { 647 error = ENOMEM; 648 break; 649 } 650 arg = (struct ng_iface_ifname *)resp->data; 651 strlcpy(arg->ngif_name, ifp->if_xname, 652 sizeof(arg->ngif_name)); 653 break; 654 } 655 656 case NGM_IFACE_POINT2POINT: 657 case NGM_IFACE_BROADCAST: 658 { 659 660 /* Deny request if interface is UP */ 661 if ((ifp->if_flags & IFF_UP) != 0) 662 return (EBUSY); 663 664 /* Change flags */ 665 switch (msg->header.cmd) { 666 case NGM_IFACE_POINT2POINT: 667 ifp->if_flags |= IFF_POINTOPOINT; 668 ifp->if_flags &= ~IFF_BROADCAST; 669 break; 670 case NGM_IFACE_BROADCAST: 671 ifp->if_flags &= ~IFF_POINTOPOINT; 672 ifp->if_flags |= IFF_BROADCAST; 673 break; 674 } 675 break; 676 } 677 678 default: 679 error = EINVAL; 680 break; 681 } 682 break; 683 case NGM_CISCO_COOKIE: 684 switch (msg->header.cmd) { 685 case NGM_CISCO_GET_IPADDR: /* we understand this too */ 686 { 687 struct ifaddr_container *ifac; 688 689 /* Return the first configured IP address */ 690 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], 691 ifa_link) { 692 struct ifaddr *ifa = ifac->ifa; 693 struct ng_cisco_ipaddr *ips; 694 695 if (ifa->ifa_addr->sa_family != AF_INET) 696 continue; 697 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT); 698 if (resp == NULL) { 699 error = ENOMEM; 700 break; 701 } 702 ips = (struct ng_cisco_ipaddr *)resp->data; 703 ips->ipaddr = ((struct sockaddr_in *) 704 ifa->ifa_addr)->sin_addr; 705 ips->netmask = ((struct sockaddr_in *) 706 ifa->ifa_netmask)->sin_addr; 707 break; 708 } 709 710 /* No IP addresses on this interface? */ 711 if (ifac == NULL) 712 error = EADDRNOTAVAIL; 713 break; 714 } 715 default: 716 error = EINVAL; 717 break; 718 } 719 break; 720 default: 721 error = EINVAL; 722 break; 723 } 724 if (rptr) 725 *rptr = resp; 726 else if (resp) 727 kfree(resp, M_NETGRAPH); 728 kfree(msg, M_NETGRAPH); 729 return (error); 730 } 731 732 /* 733 * Recive data from a hook. Pass the packet to the correct input routine. 734 */ 735 static int 736 ng_iface_rcvdata(hook_p hook, struct mbuf *m, meta_p meta) 737 { 738 const priv_p priv = hook->node->private; 739 const iffam_p iffam = get_iffam_from_hook(priv, hook); 740 struct ifnet *const ifp = priv->ifp; 741 int isr; 742 743 /* Sanity checks */ 744 KASSERT(iffam != NULL, ("%s: iffam", __func__)); 745 KASSERT(m->m_flags & M_PKTHDR, ("%s: not pkthdr", __func__)); 746 if (m == NULL) 747 return (EINVAL); 748 if ((ifp->if_flags & IFF_UP) == 0) { 749 NG_FREE_DATA(m, meta); 750 return (ENETDOWN); 751 } 752 753 /* Update interface stats */ 754 ifp->if_ipackets++; 755 ifp->if_ibytes += m->m_pkthdr.len; 756 757 /* Note receiving interface */ 758 m->m_pkthdr.rcvif = ifp; 759 760 /* Berkeley packet filter */ 761 ng_iface_bpftap(ifp, m, iffam->family); 762 763 /* Ignore any meta-data */ 764 NG_FREE_META(meta); 765 766 /* Send packet */ 767 switch (iffam->family) { 768 #ifdef INET 769 case AF_INET: 770 isr = NETISR_IP; 771 break; 772 #endif 773 #ifdef INET6 774 case AF_INET6: 775 isr = NETISR_IPV6; 776 break; 777 #endif 778 #ifdef IPX 779 case AF_IPX: 780 isr = NETISR_IPX; 781 break; 782 #endif 783 default: 784 m_freem(m); 785 return (EAFNOSUPPORT); 786 } 787 netisr_queue(isr, m); 788 return (0); 789 } 790 791 /* 792 * Shutdown and remove the node and its associated interface. 793 */ 794 static int 795 ng_iface_rmnode(node_p node) 796 { 797 const priv_p priv = node->private; 798 799 ng_cutlinks(node); 800 ng_unname(node); 801 bpfdetach(priv->ifp); 802 if_detach(priv->ifp); 803 kfree(priv->ifp, M_NETGRAPH); 804 priv->ifp = NULL; 805 ng_iface_free_unit(priv->unit); 806 kfree(priv, M_NETGRAPH); 807 node->private = NULL; 808 ng_unref(node); 809 return (0); 810 } 811 812 /* 813 * Hook disconnection. Note that we do *not* shutdown when all 814 * hooks have been disconnected. 815 */ 816 static int 817 ng_iface_disconnect(hook_p hook) 818 { 819 const priv_p priv = hook->node->private; 820 const iffam_p iffam = get_iffam_from_hook(priv, hook); 821 822 if (iffam == NULL) 823 panic(__func__); 824 *get_hook_from_iffam(priv, iffam) = NULL; 825 return (0); 826 } 827 828