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, 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 57 #include <sys/param.h> 58 #include <sys/systm.h> 59 #include <sys/errno.h> 60 #include <sys/kernel.h> 61 #include <sys/malloc.h> 62 #include <sys/mbuf.h> 63 #include <sys/sockio.h> 64 #include <sys/socket.h> 65 #include <sys/syslog.h> 66 #include <sys/libkern.h> 67 #include <sys/thread2.h> 68 69 #include <net/if.h> 70 #include <net/if_types.h> 71 #include <net/ifq_var.h> 72 #include <net/netisr.h> 73 #include <net/bpf.h> 74 75 #include <netinet/in.h> 76 77 #include <netgraph/ng_message.h> 78 #include <netgraph/netgraph.h> 79 #include <netgraph/ng_parse.h> 80 #include "ng_iface.h" 81 #include <netgraph/cisco/ng_cisco.h> 82 83 /* This struct describes one address family */ 84 struct iffam { 85 sa_family_t family; /* Address family */ 86 const char *hookname; /* Name for hook */ 87 }; 88 typedef const struct iffam *iffam_p; 89 90 /* List of address families supported by our interface */ 91 static const struct iffam gFamilies[] = { 92 { AF_INET, NG_IFACE_HOOK_INET }, 93 { AF_INET6, NG_IFACE_HOOK_INET6 }, 94 { AF_ATM, NG_IFACE_HOOK_ATM }, 95 { AF_NATM, NG_IFACE_HOOK_NATM }, 96 }; 97 #define NUM_FAMILIES NELEM(gFamilies) 98 99 /* Node private data */ 100 struct ng_iface_private { 101 struct ifnet *ifp; /* Our interface */ 102 int unit; /* Interface unit number */ 103 node_p node; /* Our netgraph node */ 104 hook_p hooks[NUM_FAMILIES]; /* Hook for each address family */ 105 }; 106 typedef struct ng_iface_private *priv_p; 107 108 /* Interface methods */ 109 static void ng_iface_start(struct ifnet *ifp, struct ifaltq_subque *); 110 static int ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data, 111 struct ucred *cr); 112 static int ng_iface_output(struct ifnet *ifp, struct mbuf *m0, 113 struct sockaddr *dst, struct rtentry *rt0); 114 static void ng_iface_bpftap(struct ifnet *ifp, 115 struct mbuf *m, sa_family_t family); 116 #ifdef DEBUG 117 static void ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data); 118 #endif 119 120 /* Netgraph methods */ 121 static ng_constructor_t ng_iface_constructor; 122 static ng_rcvmsg_t ng_iface_rcvmsg; 123 static ng_shutdown_t ng_iface_rmnode; 124 static ng_newhook_t ng_iface_newhook; 125 static ng_rcvdata_t ng_iface_rcvdata; 126 static ng_disconnect_t ng_iface_disconnect; 127 128 /* Helper stuff */ 129 static iffam_p get_iffam_from_af(sa_family_t family); 130 static iffam_p get_iffam_from_hook(priv_p priv, hook_p hook); 131 static iffam_p get_iffam_from_name(const char *name); 132 static hook_p *get_hook_from_iffam(priv_p priv, iffam_p iffam); 133 134 /* Parse type for struct ng_iface_ifname */ 135 static const struct ng_parse_fixedstring_info ng_iface_ifname_info = { 136 NG_IFACE_IFACE_NAME_MAX + 1 137 }; 138 static const struct ng_parse_type ng_iface_ifname_type = { 139 &ng_parse_fixedstring_type, 140 &ng_iface_ifname_info 141 }; 142 143 /* Parse type for struct ng_cisco_ipaddr */ 144 static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[] 145 = NG_CISCO_IPADDR_TYPE_INFO; 146 static const struct ng_parse_type ng_cisco_ipaddr_type = { 147 &ng_parse_struct_type, 148 &ng_cisco_ipaddr_type_fields 149 }; 150 151 /* List of commands and how to convert arguments to/from ASCII */ 152 static const struct ng_cmdlist ng_iface_cmds[] = { 153 { 154 NGM_IFACE_COOKIE, 155 NGM_IFACE_GET_IFNAME, 156 "getifname", 157 NULL, 158 &ng_iface_ifname_type 159 }, 160 { 161 NGM_IFACE_COOKIE, 162 NGM_IFACE_POINT2POINT, 163 "point2point", 164 NULL, 165 NULL 166 }, 167 { 168 NGM_IFACE_COOKIE, 169 NGM_IFACE_BROADCAST, 170 "broadcast", 171 NULL, 172 NULL 173 }, 174 { 175 NGM_CISCO_COOKIE, 176 NGM_CISCO_GET_IPADDR, 177 "getipaddr", 178 NULL, 179 &ng_cisco_ipaddr_type 180 }, 181 { 0 } 182 }; 183 184 /* Node type descriptor */ 185 static struct ng_type typestruct = { 186 NG_VERSION, 187 NG_IFACE_NODE_TYPE, 188 NULL, 189 ng_iface_constructor, 190 ng_iface_rcvmsg, 191 ng_iface_rmnode, 192 ng_iface_newhook, 193 NULL, 194 NULL, 195 ng_iface_rcvdata, 196 ng_iface_rcvdata, 197 ng_iface_disconnect, 198 ng_iface_cmds 199 }; 200 NETGRAPH_INIT(iface, &typestruct); 201 202 /* We keep a bitmap indicating which unit numbers are free. 203 One means the unit number is free, zero means it's taken. */ 204 static int *ng_iface_units = NULL; 205 static int ng_iface_units_len = 0; 206 207 #define UNITS_BITSPERWORD (sizeof(*ng_iface_units) * NBBY) 208 209 /************************************************************************ 210 HELPER STUFF 211 ************************************************************************/ 212 213 /* 214 * Get the family descriptor from the family ID 215 */ 216 static __inline__ iffam_p 217 get_iffam_from_af(sa_family_t family) 218 { 219 iffam_p iffam; 220 int k; 221 222 for (k = 0; k < NUM_FAMILIES; k++) { 223 iffam = &gFamilies[k]; 224 if (iffam->family == family) 225 return (iffam); 226 } 227 return (NULL); 228 } 229 230 /* 231 * Get the family descriptor from the hook 232 */ 233 static __inline__ iffam_p 234 get_iffam_from_hook(priv_p priv, hook_p hook) 235 { 236 int k; 237 238 for (k = 0; k < NUM_FAMILIES; k++) 239 if (priv->hooks[k] == hook) 240 return (&gFamilies[k]); 241 return (NULL); 242 } 243 244 /* 245 * Get the hook from the iffam descriptor 246 */ 247 248 static __inline__ hook_p * 249 get_hook_from_iffam(priv_p priv, iffam_p iffam) 250 { 251 return (&priv->hooks[iffam - gFamilies]); 252 } 253 254 /* 255 * Get the iffam descriptor from the name 256 */ 257 static __inline__ iffam_p 258 get_iffam_from_name(const char *name) 259 { 260 iffam_p iffam; 261 int k; 262 263 for (k = 0; k < NUM_FAMILIES; k++) { 264 iffam = &gFamilies[k]; 265 if (!strcmp(iffam->hookname, name)) 266 return (iffam); 267 } 268 return (NULL); 269 } 270 271 /* 272 * Find the first free unit number for a new interface. 273 * Increase the size of the unit bitmap as necessary. 274 */ 275 static __inline__ int 276 ng_iface_get_unit(int *unit) 277 { 278 int index, bit; 279 280 for (index = 0; index < ng_iface_units_len 281 && ng_iface_units[index] == 0; index++); 282 if (index == ng_iface_units_len) { /* extend array */ 283 int i, *newarray, newlen; 284 285 newlen = (2 * ng_iface_units_len) + 4; 286 newarray = kmalloc(newlen * sizeof(*ng_iface_units), 287 M_NETGRAPH, M_NOWAIT); 288 if (newarray == NULL) 289 return (ENOMEM); 290 bcopy(ng_iface_units, newarray, 291 ng_iface_units_len * sizeof(*ng_iface_units)); 292 for (i = ng_iface_units_len; i < newlen; i++) 293 newarray[i] = ~0; 294 if (ng_iface_units != NULL) 295 kfree(ng_iface_units, M_NETGRAPH); 296 ng_iface_units = newarray; 297 ng_iface_units_len = newlen; 298 } 299 bit = ffs(ng_iface_units[index]) - 1; 300 KASSERT(bit >= 0 && bit <= UNITS_BITSPERWORD - 1, 301 ("%s: word=%d bit=%d", __func__, ng_iface_units[index], bit)); 302 ng_iface_units[index] &= ~(1 << bit); 303 *unit = (index * UNITS_BITSPERWORD) + bit; 304 return (0); 305 } 306 307 /* 308 * Free a no longer needed unit number. 309 */ 310 static __inline__ void 311 ng_iface_free_unit(int unit) 312 { 313 int index, bit; 314 315 index = unit / UNITS_BITSPERWORD; 316 bit = unit % UNITS_BITSPERWORD; 317 KASSERT(index < ng_iface_units_len, 318 ("%s: unit=%d len=%d", __func__, unit, ng_iface_units_len)); 319 KASSERT((ng_iface_units[index] & (1 << bit)) == 0, 320 ("%s: unit=%d is free", __func__, unit)); 321 ng_iface_units[index] |= (1 << bit); 322 /* 323 * XXX We could think about reducing the size of ng_iface_units[] 324 * XXX here if the last portion is all ones 325 */ 326 } 327 328 /************************************************************************ 329 INTERFACE STUFF 330 ************************************************************************/ 331 332 /* 333 * Process an ioctl for the virtual interface 334 */ 335 static int 336 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data, 337 struct ucred *cr) 338 { 339 struct ifreq *const ifr = (struct ifreq *) data; 340 int error = 0; 341 342 #ifdef DEBUG 343 ng_iface_print_ioctl(ifp, command, data); 344 #endif 345 crit_enter(); 346 switch (command) { 347 348 /* These two are mostly handled at a higher layer */ 349 case SIOCSIFADDR: 350 ifp->if_flags |= (IFF_UP | IFF_RUNNING); 351 ifq_clr_oactive(&ifp->if_snd); 352 break; 353 case SIOCGIFADDR: 354 break; 355 356 /* Set flags */ 357 case SIOCSIFFLAGS: 358 /* 359 * If the interface is marked up and stopped, then start it. 360 * If it is marked down and running, then stop it. 361 */ 362 if (ifr->ifr_flags & IFF_UP) { 363 if (!(ifp->if_flags & IFF_RUNNING)) { 364 ifq_clr_oactive(&ifp->if_snd); 365 ifp->if_flags |= IFF_RUNNING; 366 } 367 } else { 368 if (ifp->if_flags & IFF_RUNNING) { 369 ifp->if_flags &= ~IFF_RUNNING; 370 ifq_clr_oactive(&ifp->if_snd); 371 } 372 } 373 break; 374 375 /* Set the interface MTU */ 376 case SIOCSIFMTU: 377 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX 378 || ifr->ifr_mtu < NG_IFACE_MTU_MIN) 379 error = EINVAL; 380 else 381 ifp->if_mtu = ifr->ifr_mtu; 382 break; 383 384 /* Stuff that's not supported */ 385 case SIOCADDMULTI: 386 case SIOCDELMULTI: 387 error = 0; 388 break; 389 case SIOCSIFPHYS: 390 error = EOPNOTSUPP; 391 break; 392 393 default: 394 error = EINVAL; 395 break; 396 } 397 crit_exit(); 398 return (error); 399 } 400 401 /* 402 * This routine is called to deliver a packet out the interface. 403 * We simply look at the address family and relay the packet to 404 * the corresponding hook, if it exists and is connected. 405 */ 406 407 static int 408 ng_iface_output_serialized(struct ifnet *ifp, struct mbuf *m, 409 struct sockaddr *dst, struct rtentry *rt0) 410 { 411 const priv_p priv = (priv_p) ifp->if_softc; 412 const iffam_p iffam = get_iffam_from_af(dst->sa_family); 413 meta_p meta = NULL; 414 int len, error = 0; 415 416 /* Check interface flags */ 417 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { 418 m_freem(m); 419 return (ENETDOWN); 420 } 421 422 /* BPF writes need to be handled specially */ 423 if (dst->sa_family == AF_UNSPEC) { 424 if (m->m_len < 4 && (m = m_pullup(m, 4)) == NULL) 425 return (ENOBUFS); 426 dst->sa_family = (sa_family_t)*mtod(m, int32_t *); 427 m->m_data += 4; 428 m->m_len -= 4; 429 m->m_pkthdr.len -= 4; 430 } 431 432 /* Berkeley packet filter */ 433 ng_iface_bpftap(ifp, m, dst->sa_family); 434 435 /* Check address family to determine hook (if known) */ 436 if (iffam == NULL) { 437 m_freem(m); 438 log(LOG_WARNING, "%s: can't handle af%d\n", 439 ifp->if_xname, (int)dst->sa_family); 440 return (EAFNOSUPPORT); 441 } 442 443 /* Copy length before the mbuf gets invalidated */ 444 len = m->m_pkthdr.len; 445 446 /* Send packet; if hook is not connected, mbuf will get freed. */ 447 NG_SEND_DATA(error, *get_hook_from_iffam(priv, iffam), m, meta); 448 449 /* Update stats */ 450 if (error == 0) { 451 IFNET_STAT_INC(ifp, obytes, len); 452 IFNET_STAT_INC(ifp, opackets, 1); 453 } 454 return (error); 455 } 456 457 static int 458 ng_iface_output(struct ifnet *ifp, struct mbuf *m, 459 struct sockaddr *dst, struct rtentry *rt0) 460 { 461 struct ifaltq_subque *ifsq = ifq_get_subq_default(&ifp->if_snd); 462 int error; 463 464 ifsq_serialize_hw(ifsq); 465 error = ng_iface_output_serialized(ifp, m, dst, rt0); 466 ifsq_deserialize_hw(ifsq); 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, struct ifaltq_subque *ifsq __unused) 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_gettoken(); 493 if (ifp->if_bpf) 494 bpf_ptap(ifp->if_bpf, m, &family, sizeof(family4)); 495 bpf_reltoken(); 496 } 497 } 498 499 #ifdef DEBUG 500 /* 501 * Display an ioctl to the virtual interface 502 */ 503 504 static void 505 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data) 506 { 507 char *str; 508 509 switch (command & IOC_DIRMASK) { 510 case IOC_VOID: 511 str = "IO"; 512 break; 513 case IOC_OUT: 514 str = "IOR"; 515 break; 516 case IOC_IN: 517 str = "IOW"; 518 break; 519 case IOC_INOUT: 520 str = "IORW"; 521 break; 522 default: 523 str = "IO??"; 524 } 525 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n", 526 ifp->if_xname, 527 str, 528 IOCGROUP(command), 529 command & 0xff, 530 IOCPARM_LEN(command)); 531 } 532 #endif /* DEBUG */ 533 534 /************************************************************************ 535 NETGRAPH NODE STUFF 536 ************************************************************************/ 537 538 /* 539 * Constructor for a node 540 */ 541 static int 542 ng_iface_constructor(node_p *nodep) 543 { 544 char ifname[NG_IFACE_IFACE_NAME_MAX + 1]; 545 struct ifnet *ifp; 546 node_p node; 547 priv_p priv; 548 int error = 0; 549 550 /* Allocate node and interface private structures */ 551 priv = kmalloc(sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO); 552 if (priv == NULL) 553 return (ENOMEM); 554 ifp = kmalloc(sizeof(*ifp), M_NETGRAPH, M_NOWAIT | M_ZERO); 555 if (ifp == NULL) { 556 kfree(priv, M_NETGRAPH); 557 return (ENOMEM); 558 } 559 560 /* Link them together */ 561 ifp->if_softc = priv; 562 priv->ifp = ifp; 563 564 /* Get an interface unit number */ 565 if ((error = ng_iface_get_unit(&priv->unit)) != 0) { 566 kfree(ifp, M_NETGRAPH); 567 kfree(priv, M_NETGRAPH); 568 return (error); 569 } 570 571 /* Call generic node constructor */ 572 if ((error = ng_make_node_common(&typestruct, nodep)) != 0) { 573 ng_iface_free_unit(priv->unit); 574 kfree(ifp, M_NETGRAPH); 575 kfree(priv, M_NETGRAPH); 576 return (error); 577 } 578 node = *nodep; 579 580 /* Link together node and private info */ 581 node->private = priv; 582 priv->node = node; 583 584 /* Initialize interface structure */ 585 if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit); 586 ifp->if_output = ng_iface_output; 587 ifp->if_start = ng_iface_start; 588 ifp->if_ioctl = ng_iface_ioctl; 589 ifp->if_watchdog = NULL; 590 ifq_set_maxlen(&ifp->if_snd, IFQ_MAXLEN); 591 ifp->if_mtu = NG_IFACE_MTU_DEFAULT; 592 ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST); 593 ifp->if_type = IFT_PROPVIRTUAL; /* XXX */ 594 ifp->if_addrlen = 0; /* XXX */ 595 ifp->if_hdrlen = 0; /* XXX */ 596 ifp->if_baudrate = 64000; /* XXX */ 597 598 /* Give this node the same name as the interface (if possible) */ 599 bzero(ifname, sizeof(ifname)); 600 strlcpy(ifname, ifp->if_xname, sizeof(ifname)); 601 if (ng_name_node(node, ifname) != 0) 602 log(LOG_WARNING, "%s: can't acquire netgraph name\n", ifname); 603 604 /* Attach the interface */ 605 if_attach(ifp, NULL); 606 bpfattach(ifp, DLT_NULL, sizeof(uint32_t)); 607 608 /* Done */ 609 return (0); 610 } 611 612 /* 613 * Give our ok for a hook to be added 614 */ 615 static int 616 ng_iface_newhook(node_p node, hook_p hook, const char *name) 617 { 618 const iffam_p iffam = get_iffam_from_name(name); 619 hook_p *hookptr; 620 621 if (iffam == NULL) 622 return (EPFNOSUPPORT); 623 hookptr = get_hook_from_iffam((priv_p) node->private, iffam); 624 if (*hookptr != NULL) 625 return (EISCONN); 626 *hookptr = hook; 627 return (0); 628 } 629 630 /* 631 * Receive a control message 632 */ 633 static int 634 ng_iface_rcvmsg(node_p node, struct ng_mesg *msg, 635 const char *retaddr, struct ng_mesg **rptr) 636 { 637 const priv_p priv = node->private; 638 struct ifnet *const ifp = priv->ifp; 639 struct ng_mesg *resp = NULL; 640 int error = 0; 641 642 switch (msg->header.typecookie) { 643 case NGM_IFACE_COOKIE: 644 switch (msg->header.cmd) { 645 case NGM_IFACE_GET_IFNAME: 646 { 647 struct ng_iface_ifname *arg; 648 649 NG_MKRESPONSE(resp, msg, sizeof(*arg), M_NOWAIT); 650 if (resp == NULL) { 651 error = ENOMEM; 652 break; 653 } 654 arg = (struct ng_iface_ifname *)resp->data; 655 strlcpy(arg->ngif_name, ifp->if_xname, 656 sizeof(arg->ngif_name)); 657 break; 658 } 659 660 case NGM_IFACE_POINT2POINT: 661 case NGM_IFACE_BROADCAST: 662 { 663 664 /* Deny request if interface is UP */ 665 if ((ifp->if_flags & IFF_UP) != 0) 666 return (EBUSY); 667 668 /* Change flags */ 669 switch (msg->header.cmd) { 670 case NGM_IFACE_POINT2POINT: 671 ifp->if_flags |= IFF_POINTOPOINT; 672 ifp->if_flags &= ~IFF_BROADCAST; 673 break; 674 case NGM_IFACE_BROADCAST: 675 ifp->if_flags &= ~IFF_POINTOPOINT; 676 ifp->if_flags |= IFF_BROADCAST; 677 break; 678 } 679 break; 680 } 681 682 default: 683 error = EINVAL; 684 break; 685 } 686 break; 687 case NGM_CISCO_COOKIE: 688 switch (msg->header.cmd) { 689 case NGM_CISCO_GET_IPADDR: /* we understand this too */ 690 { 691 struct ifaddr_container *ifac; 692 693 /* Return the first configured IP address */ 694 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], 695 ifa_link) { 696 struct ifaddr *ifa = ifac->ifa; 697 struct ng_cisco_ipaddr *ips; 698 699 if (ifa->ifa_addr->sa_family != AF_INET) 700 continue; 701 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT); 702 if (resp == NULL) { 703 error = ENOMEM; 704 break; 705 } 706 ips = (struct ng_cisco_ipaddr *)resp->data; 707 ips->ipaddr = ((struct sockaddr_in *) 708 ifa->ifa_addr)->sin_addr; 709 ips->netmask = ((struct sockaddr_in *) 710 ifa->ifa_netmask)->sin_addr; 711 break; 712 } 713 714 /* No IP addresses on this interface? */ 715 if (ifac == NULL) 716 error = EADDRNOTAVAIL; 717 break; 718 } 719 default: 720 error = EINVAL; 721 break; 722 } 723 break; 724 default: 725 error = EINVAL; 726 break; 727 } 728 if (rptr) 729 *rptr = resp; 730 else if (resp) 731 kfree(resp, M_NETGRAPH); 732 kfree(msg, M_NETGRAPH); 733 return (error); 734 } 735 736 /* 737 * Recive data from a hook. Pass the packet to the correct input routine. 738 */ 739 static int 740 ng_iface_rcvdata(hook_p hook, struct mbuf *m, meta_p meta) 741 { 742 const priv_p priv = hook->node->private; 743 const iffam_p iffam = get_iffam_from_hook(priv, hook); 744 struct ifnet *const ifp = priv->ifp; 745 int isr; 746 747 /* Sanity checks */ 748 KASSERT(iffam != NULL, ("%s: iffam", __func__)); 749 KASSERT(m->m_flags & M_PKTHDR, ("%s: not pkthdr", __func__)); 750 if (m == NULL) 751 return (EINVAL); 752 if ((ifp->if_flags & IFF_UP) == 0) { 753 NG_FREE_DATA(m, meta); 754 return (ENETDOWN); 755 } 756 757 /* Update interface stats */ 758 IFNET_STAT_INC(ifp, ipackets, 1); 759 IFNET_STAT_INC(ifp, ibytes, m->m_pkthdr.len); 760 761 /* Note receiving interface */ 762 m->m_pkthdr.rcvif = ifp; 763 764 /* Berkeley packet filter */ 765 ng_iface_bpftap(ifp, m, iffam->family); 766 767 /* Ignore any meta-data */ 768 NG_FREE_META(meta); 769 770 /* Send packet */ 771 switch (iffam->family) { 772 #ifdef INET 773 case AF_INET: 774 isr = NETISR_IP; 775 break; 776 #endif 777 #ifdef INET6 778 case AF_INET6: 779 isr = NETISR_IPV6; 780 break; 781 #endif 782 default: 783 m_freem(m); 784 return (EAFNOSUPPORT); 785 } 786 netisr_queue(isr, m); 787 return (0); 788 } 789 790 /* 791 * Shutdown and remove the node and its associated interface. 792 */ 793 static int 794 ng_iface_rmnode(node_p node) 795 { 796 const priv_p priv = node->private; 797 798 ng_cutlinks(node); 799 ng_unname(node); 800 bpfdetach(priv->ifp); 801 if_detach(priv->ifp); 802 kfree(priv->ifp, M_NETGRAPH); 803 priv->ifp = NULL; 804 ng_iface_free_unit(priv->unit); 805 kfree(priv, M_NETGRAPH); 806 node->private = NULL; 807 ng_unref(node); 808 return (0); 809 } 810 811 /* 812 * Hook disconnection. Note that we do *not* shutdown when all 813 * hooks have been disconnected. 814 */ 815 static int 816 ng_iface_disconnect(hook_p hook) 817 { 818 const priv_p priv = hook->node->private; 819 const iffam_p iffam = get_iffam_from_hook(priv, hook); 820 821 if (iffam == NULL) 822 panic(__func__); 823 *get_hook_from_iffam(priv, iffam) = NULL; 824 return (0); 825 } 826 827