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sys/netgraph/ng_iface.c
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1 /* 2 * ng_iface.c 3 * 4 * Copyright (c) 1996-1999 Whistle Communications, Inc. 5 * All rights reserved. 6 * 7 * Subject to the following obligations and disclaimer of warranty, use and 8 * redistribution of this software, in source or object code forms, with or 9 * without modifications are expressly permitted by Whistle Communications; 10 * provided, however, that: 11 * 1. Any and all reproductions of the source or object code must include the 12 * copyright notice above and the following disclaimer of warranties; and 13 * 2. No rights are granted, in any manner or form, to use Whistle 14 * Communications, Inc. trademarks, including the mark "WHISTLE 15 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 16 * such appears in the above copyright notice or in the software. 17 * 18 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 19 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 20 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 21 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 22 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 23 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 24 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 25 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 26 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 27 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 28 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 29 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 30 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 33 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 34 * OF SUCH DAMAGE. 35 * 36 * Author: Archie Cobbs <archie@freebsd.org> 37 * 38 * $FreeBSD: releng/5.3/sys/netgraph/ng_iface.c 136588 2004-10-16 08:43:07Z cvs2svn $ 39 * $Whistle: ng_iface.c,v 1.33 1999/11/01 09:24:51 julian Exp $ 40 */ 41 42 /* 43 * This node is also a system networking interface. It has 44 * a hook for each protocol (IP, AppleTalk, IPX, etc). Packets 45 * are simply relayed between the interface and the hooks. 46 * 47 * Interfaces are named ng0, ng1, etc. New nodes take the 48 * first available interface name. 49 * 50 * This node also includes Berkeley packet filter support. 51 */ 52 53 #include "opt_atalk.h" 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/lock.h> 63 #include <sys/malloc.h> 64 #include <sys/mbuf.h> 65 #include <sys/mutex.h> 66 #include <sys/errno.h> 67 #include <sys/random.h> 68 #include <sys/sockio.h> 69 #include <sys/socket.h> 70 #include <sys/syslog.h> 71 #include <sys/libkern.h> 72 73 #include <net/if.h> 74 #include <net/if_types.h> 75 #include <net/bpf.h> 76 #include <net/netisr.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 <netgraph/ng_iface.h> 84 #include <netgraph/ng_cisco.h> 85 86 #ifdef NG_SEPARATE_MALLOC 87 MALLOC_DEFINE(M_NETGRAPH_IFACE, "netgraph_iface", "netgraph iface node "); 88 #else 89 #define M_NETGRAPH_IFACE M_NETGRAPH 90 #endif 91 92 /* This struct describes one address family */ 93 struct iffam { 94 sa_family_t family; /* Address family */ 95 const char *hookname; /* Name for hook */ 96 }; 97 typedef const struct iffam *iffam_p; 98 99 /* List of address families supported by our interface */ 100 const static struct iffam gFamilies[] = { 101 { AF_INET, NG_IFACE_HOOK_INET }, 102 { AF_INET6, NG_IFACE_HOOK_INET6 }, 103 { AF_APPLETALK, NG_IFACE_HOOK_ATALK }, 104 { AF_IPX, NG_IFACE_HOOK_IPX }, 105 { AF_ATM, NG_IFACE_HOOK_ATM }, 106 { AF_NATM, NG_IFACE_HOOK_NATM }, 107 }; 108 #define NUM_FAMILIES (sizeof(gFamilies) / sizeof(*gFamilies)) 109 110 /* Node private data */ 111 struct ng_iface_private { 112 struct ifnet *ifp; /* Our interface */ 113 int unit; /* Interface unit number */ 114 node_p node; /* Our netgraph node */ 115 hook_p hooks[NUM_FAMILIES]; /* Hook for each address family */ 116 }; 117 typedef struct ng_iface_private *priv_p; 118 119 /* Interface methods */ 120 static void ng_iface_start(struct ifnet *ifp); 121 static int ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data); 122 static int ng_iface_output(struct ifnet *ifp, struct mbuf *m0, 123 struct sockaddr *dst, struct rtentry *rt0); 124 static void ng_iface_bpftap(struct ifnet *ifp, 125 struct mbuf *m, sa_family_t family); 126 #ifdef DEBUG 127 static void ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data); 128 #endif 129 130 /* Netgraph methods */ 131 static ng_constructor_t ng_iface_constructor; 132 static ng_rcvmsg_t ng_iface_rcvmsg; 133 static ng_shutdown_t ng_iface_shutdown; 134 static ng_newhook_t ng_iface_newhook; 135 static ng_rcvdata_t ng_iface_rcvdata; 136 static ng_disconnect_t ng_iface_disconnect; 137 138 /* Helper stuff */ 139 static iffam_p get_iffam_from_af(sa_family_t family); 140 static iffam_p get_iffam_from_hook(priv_p priv, hook_p hook); 141 static iffam_p get_iffam_from_name(const char *name); 142 static hook_p *get_hook_from_iffam(priv_p priv, iffam_p iffam); 143 144 /* Parse type for struct ng_iface_ifname */ 145 static const struct ng_parse_fixedstring_info ng_iface_ifname_info = { 146 NG_IFACE_IFACE_NAME_MAX + 1 147 }; 148 static const struct ng_parse_type ng_iface_ifname_type = { 149 &ng_parse_fixedstring_type, 150 &ng_iface_ifname_info 151 }; 152 153 /* Parse type for struct ng_cisco_ipaddr */ 154 static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[] 155 = NG_CISCO_IPADDR_TYPE_INFO; 156 static const struct ng_parse_type ng_cisco_ipaddr_type = { 157 &ng_parse_struct_type, 158 &ng_cisco_ipaddr_type_fields 159 }; 160 161 /* List of commands and how to convert arguments to/from ASCII */ 162 static const struct ng_cmdlist ng_iface_cmds[] = { 163 { 164 NGM_IFACE_COOKIE, 165 NGM_IFACE_GET_IFNAME, 166 "getifname", 167 NULL, 168 &ng_iface_ifname_type 169 }, 170 { 171 NGM_IFACE_COOKIE, 172 NGM_IFACE_POINT2POINT, 173 "point2point", 174 NULL, 175 NULL 176 }, 177 { 178 NGM_IFACE_COOKIE, 179 NGM_IFACE_BROADCAST, 180 "broadcast", 181 NULL, 182 NULL 183 }, 184 { 185 NGM_CISCO_COOKIE, 186 NGM_CISCO_GET_IPADDR, 187 "getipaddr", 188 NULL, 189 &ng_cisco_ipaddr_type 190 }, 191 { 192 NGM_IFACE_COOKIE, 193 NGM_IFACE_GET_IFINDEX, 194 "getifindex", 195 NULL, 196 &ng_parse_uint32_type 197 }, 198 { 0 } 199 }; 200 201 /* Node type descriptor */ 202 static struct ng_type typestruct = { 203 .version = NG_ABI_VERSION, 204 .name = NG_IFACE_NODE_TYPE, 205 .constructor = ng_iface_constructor, 206 .rcvmsg = ng_iface_rcvmsg, 207 .shutdown = ng_iface_shutdown, 208 .newhook = ng_iface_newhook, 209 .rcvdata = ng_iface_rcvdata, 210 .disconnect = ng_iface_disconnect, 211 .cmdlist = ng_iface_cmds, 212 }; 213 NETGRAPH_INIT(iface, &typestruct); 214 215 /* We keep a bitmap indicating which unit numbers are free. 216 One means the unit number is free, zero means it's taken. */ 217 static int *ng_iface_units = NULL; 218 static int ng_iface_units_len = 0; 219 static int ng_units_in_use = 0; 220 221 #define UNITS_BITSPERWORD (sizeof(*ng_iface_units) * NBBY) 222 223 static struct mtx ng_iface_mtx; 224 MTX_SYSINIT(ng_iface, &ng_iface_mtx, "ng_iface", MTX_DEF); 225 226 /************************************************************************ 227 HELPER STUFF 228 ************************************************************************/ 229 230 /* 231 * Get the family descriptor from the family ID 232 */ 233 static __inline iffam_p 234 get_iffam_from_af(sa_family_t family) 235 { 236 iffam_p iffam; 237 int k; 238 239 for (k = 0; k < NUM_FAMILIES; k++) { 240 iffam = &gFamilies[k]; 241 if (iffam->family == family) 242 return (iffam); 243 } 244 return (NULL); 245 } 246 247 /* 248 * Get the family descriptor from the hook 249 */ 250 static __inline iffam_p 251 get_iffam_from_hook(priv_p priv, hook_p hook) 252 { 253 int k; 254 255 for (k = 0; k < NUM_FAMILIES; k++) 256 if (priv->hooks[k] == hook) 257 return (&gFamilies[k]); 258 return (NULL); 259 } 260 261 /* 262 * Get the hook from the iffam descriptor 263 */ 264 265 static __inline hook_p * 266 get_hook_from_iffam(priv_p priv, iffam_p iffam) 267 { 268 return (&priv->hooks[iffam - gFamilies]); 269 } 270 271 /* 272 * Get the iffam descriptor from the name 273 */ 274 static __inline iffam_p 275 get_iffam_from_name(const char *name) 276 { 277 iffam_p iffam; 278 int k; 279 280 for (k = 0; k < NUM_FAMILIES; k++) { 281 iffam = &gFamilies[k]; 282 if (!strcmp(iffam->hookname, name)) 283 return (iffam); 284 } 285 return (NULL); 286 } 287 288 /* 289 * Find the first free unit number for a new interface. 290 * Increase the size of the unit bitmap as necessary. 291 */ 292 static __inline int 293 ng_iface_get_unit(int *unit) 294 { 295 int index, bit; 296 297 mtx_lock(&ng_iface_mtx); 298 for (index = 0; index < ng_iface_units_len 299 && ng_iface_units[index] == 0; index++); 300 if (index == ng_iface_units_len) { /* extend array */ 301 int i, *newarray, newlen; 302 303 newlen = (2 * ng_iface_units_len) + 4; 304 MALLOC(newarray, int *, newlen * sizeof(*ng_iface_units), 305 M_NETGRAPH_IFACE, M_NOWAIT); 306 if (newarray == NULL) { 307 mtx_unlock(&ng_iface_mtx); 308 return (ENOMEM); 309 } 310 bcopy(ng_iface_units, newarray, 311 ng_iface_units_len * sizeof(*ng_iface_units)); 312 for (i = ng_iface_units_len; i < newlen; i++) 313 newarray[i] = ~0; 314 if (ng_iface_units != NULL) 315 FREE(ng_iface_units, M_NETGRAPH_IFACE); 316 ng_iface_units = newarray; 317 ng_iface_units_len = newlen; 318 } 319 bit = ffs(ng_iface_units[index]) - 1; 320 KASSERT(bit >= 0 && bit <= UNITS_BITSPERWORD - 1, 321 ("%s: word=%d bit=%d", __func__, ng_iface_units[index], bit)); 322 ng_iface_units[index] &= ~(1 << bit); 323 *unit = (index * UNITS_BITSPERWORD) + bit; 324 ng_units_in_use++; 325 mtx_unlock(&ng_iface_mtx); 326 return (0); 327 } 328 329 /* 330 * Free a no longer needed unit number. 331 */ 332 static __inline void 333 ng_iface_free_unit(int unit) 334 { 335 int index, bit; 336 337 index = unit / UNITS_BITSPERWORD; 338 bit = unit % UNITS_BITSPERWORD; 339 mtx_lock(&ng_iface_mtx); 340 KASSERT(index < ng_iface_units_len, 341 ("%s: unit=%d len=%d", __func__, unit, ng_iface_units_len)); 342 KASSERT((ng_iface_units[index] & (1 << bit)) == 0, 343 ("%s: unit=%d is free", __func__, unit)); 344 ng_iface_units[index] |= (1 << bit); 345 /* 346 * XXX We could think about reducing the size of ng_iface_units[] 347 * XXX here if the last portion is all ones 348 * XXX At least free it if no more units. 349 * Needed if we are to eventually be able to unload. 350 */ 351 ng_units_in_use--; 352 if (ng_units_in_use == 0) { /* XXX make SMP safe */ 353 FREE(ng_iface_units, M_NETGRAPH_IFACE); 354 ng_iface_units_len = 0; 355 ng_iface_units = NULL; 356 } 357 mtx_unlock(&ng_iface_mtx); 358 } 359 360 /************************************************************************ 361 INTERFACE STUFF 362 ************************************************************************/ 363 364 /* 365 * Process an ioctl for the virtual interface 366 */ 367 static int 368 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data) 369 { 370 struct ifreq *const ifr = (struct ifreq *) data; 371 int s, error = 0; 372 373 #ifdef DEBUG 374 ng_iface_print_ioctl(ifp, command, data); 375 #endif 376 s = splimp(); 377 switch (command) { 378 379 /* These two are mostly handled at a higher layer */ 380 case SIOCSIFADDR: 381 ifp->if_flags |= (IFF_UP | IFF_RUNNING); 382 ifp->if_flags &= ~(IFF_OACTIVE); 383 break; 384 case SIOCGIFADDR: 385 break; 386 387 /* Set flags */ 388 case SIOCSIFFLAGS: 389 /* 390 * If the interface is marked up and stopped, then start it. 391 * If it is marked down and running, then stop it. 392 */ 393 if (ifr->ifr_flags & IFF_UP) { 394 if (!(ifp->if_flags & IFF_RUNNING)) { 395 ifp->if_flags &= ~(IFF_OACTIVE); 396 ifp->if_flags |= IFF_RUNNING; 397 } 398 } else { 399 if (ifp->if_flags & IFF_RUNNING) 400 ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE); 401 } 402 break; 403 404 /* Set the interface MTU */ 405 case SIOCSIFMTU: 406 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX 407 || ifr->ifr_mtu < NG_IFACE_MTU_MIN) 408 error = EINVAL; 409 else 410 ifp->if_mtu = ifr->ifr_mtu; 411 break; 412 413 /* Stuff that's not supported */ 414 case SIOCADDMULTI: 415 case SIOCDELMULTI: 416 error = 0; 417 break; 418 case SIOCSIFPHYS: 419 error = EOPNOTSUPP; 420 break; 421 422 default: 423 error = EINVAL; 424 break; 425 } 426 (void) splx(s); 427 return (error); 428 } 429 430 /* 431 * This routine is called to deliver a packet out the interface. 432 * We simply look at the address family and relay the packet to 433 * the corresponding hook, if it exists and is connected. 434 */ 435 436 static int 437 ng_iface_output(struct ifnet *ifp, struct mbuf *m, 438 struct sockaddr *dst, struct rtentry *rt0) 439 { 440 const priv_p priv = (priv_p) ifp->if_softc; 441 const iffam_p iffam = get_iffam_from_af(dst->sa_family); 442 int len, error = 0; 443 444 /* Check interface flags */ 445 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { 446 m_freem(m); 447 return (ENETDOWN); 448 } 449 450 /* BPF writes need to be handled specially */ 451 if (dst->sa_family == AF_UNSPEC) { 452 if (m->m_len < 4 && (m = m_pullup(m, 4)) == NULL) 453 return (ENOBUFS); 454 dst->sa_family = (sa_family_t)*mtod(m, int32_t *); 455 m->m_data += 4; 456 m->m_len -= 4; 457 m->m_pkthdr.len -= 4; 458 } 459 460 /* Berkeley packet filter */ 461 ng_iface_bpftap(ifp, m, dst->sa_family); 462 463 /* Check address family to determine hook (if known) */ 464 if (iffam == NULL) { 465 m_freem(m); 466 log(LOG_WARNING, "%s: can't handle af%d\n", 467 ifp->if_xname, (int)dst->sa_family); 468 return (EAFNOSUPPORT); 469 } 470 471 /* Copy length before the mbuf gets invalidated */ 472 len = m->m_pkthdr.len; 473 474 /* Send packet; if hook is not connected, mbuf will get freed. */ 475 NG_SEND_DATA_ONLY(error, *get_hook_from_iffam(priv, iffam), m); 476 477 /* Update stats */ 478 if (error == 0) { 479 ifp->if_obytes += len; 480 ifp->if_opackets++; 481 } 482 return (error); 483 } 484 485 /* 486 * This routine should never be called 487 */ 488 489 static void 490 ng_iface_start(struct ifnet *ifp) 491 { 492 if_printf(ifp, "%s called?", __func__); 493 } 494 495 /* 496 * Flash a packet by the BPF (requires prepending 4 byte AF header) 497 * Note the phoney mbuf; this is OK because BPF treats it read-only. 498 */ 499 static void 500 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family) 501 { 502 KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__)); 503 if (ifp->if_bpf != NULL) { 504 int32_t family4 = (int32_t)family; 505 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m); 506 } 507 } 508 509 #ifdef DEBUG 510 /* 511 * Display an ioctl to the virtual interface 512 */ 513 514 static void 515 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data) 516 { 517 char *str; 518 519 switch (command & IOC_DIRMASK) { 520 case IOC_VOID: 521 str = "IO"; 522 break; 523 case IOC_OUT: 524 str = "IOR"; 525 break; 526 case IOC_IN: 527 str = "IOW"; 528 break; 529 case IOC_INOUT: 530 str = "IORW"; 531 break; 532 default: 533 str = "IO??"; 534 } 535 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n", 536 ifp->if_xname, 537 str, 538 IOCGROUP(command), 539 command & 0xff, 540 IOCPARM_LEN(command)); 541 } 542 #endif /* DEBUG */ 543 544 /************************************************************************ 545 NETGRAPH NODE STUFF 546 ************************************************************************/ 547 548 /* 549 * Constructor for a node 550 */ 551 static int 552 ng_iface_constructor(node_p node) 553 { 554 char ifname[NG_IFACE_IFACE_NAME_MAX + 1]; 555 struct ifnet *ifp; 556 priv_p priv; 557 int error = 0; 558 559 /* Allocate node and interface private structures */ 560 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH_IFACE, M_NOWAIT|M_ZERO); 561 if (priv == NULL) 562 return (ENOMEM); 563 MALLOC(ifp, struct ifnet *, sizeof(*ifp), M_NETGRAPH_IFACE, M_NOWAIT|M_ZERO); 564 if (ifp == NULL) { 565 FREE(priv, M_NETGRAPH_IFACE); 566 return (ENOMEM); 567 } 568 569 /* Link them together */ 570 ifp->if_softc = priv; 571 priv->ifp = ifp; 572 573 /* Get an interface unit number */ 574 if ((error = ng_iface_get_unit(&priv->unit)) != 0) { 575 FREE(ifp, M_NETGRAPH_IFACE); 576 FREE(priv, M_NETGRAPH_IFACE); 577 return (error); 578 } 579 580 /* Link together node and private info */ 581 NG_NODE_SET_PRIVATE(node, 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 ifp->if_snd.ifq_maxlen = 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 TAILQ_INIT(&ifp->if_addrhead); 598 599 /* Give this node the same name as the interface (if possible) */ 600 bzero(ifname, sizeof(ifname)); 601 strlcpy(ifname, ifp->if_xname, sizeof(ifname)); 602 if (ng_name_node(node, ifname) != 0) 603 log(LOG_WARNING, "%s: can't acquire netgraph name\n", ifname); 604 605 /* Attach the interface */ 606 if_attach(ifp); 607 bpfattach(ifp, DLT_NULL, sizeof(u_int)); 608 609 /* Done */ 610 return (0); 611 } 612 613 /* 614 * Give our ok for a hook to be added 615 */ 616 static int 617 ng_iface_newhook(node_p node, hook_p hook, const char *name) 618 { 619 const iffam_p iffam = get_iffam_from_name(name); 620 hook_p *hookptr; 621 622 if (iffam == NULL) 623 return (EPFNOSUPPORT); 624 hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam); 625 if (*hookptr != NULL) 626 return (EISCONN); 627 *hookptr = hook; 628 return (0); 629 } 630 631 /* 632 * Receive a control message 633 */ 634 static int 635 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook) 636 { 637 const priv_p priv = NG_NODE_PRIVATE(node); 638 struct ifnet *const ifp = priv->ifp; 639 struct ng_mesg *resp = NULL; 640 int error = 0; 641 struct ng_mesg *msg; 642 643 NGI_GET_MSG(item, msg); 644 switch (msg->header.typecookie) { 645 case NGM_IFACE_COOKIE: 646 switch (msg->header.cmd) { 647 case NGM_IFACE_GET_IFNAME: 648 { 649 struct ng_iface_ifname *arg; 650 651 NG_MKRESPONSE(resp, msg, sizeof(*arg), M_NOWAIT); 652 if (resp == NULL) { 653 error = ENOMEM; 654 break; 655 } 656 arg = (struct ng_iface_ifname *)resp->data; 657 strlcpy(arg->ngif_name, ifp->if_xname, 658 sizeof(arg->ngif_name)); 659 break; 660 } 661 662 case NGM_IFACE_POINT2POINT: 663 case NGM_IFACE_BROADCAST: 664 { 665 666 /* Deny request if interface is UP */ 667 if ((ifp->if_flags & IFF_UP) != 0) 668 return (EBUSY); 669 670 /* Change flags */ 671 switch (msg->header.cmd) { 672 case NGM_IFACE_POINT2POINT: 673 ifp->if_flags |= IFF_POINTOPOINT; 674 ifp->if_flags &= ~IFF_BROADCAST; 675 break; 676 case NGM_IFACE_BROADCAST: 677 ifp->if_flags &= ~IFF_POINTOPOINT; 678 ifp->if_flags |= IFF_BROADCAST; 679 break; 680 } 681 break; 682 } 683 684 case NGM_IFACE_GET_IFINDEX: 685 NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT); 686 if (resp == NULL) { 687 error = ENOMEM; 688 break; 689 } 690 *((uint32_t *)resp->data) = priv->ifp->if_index; 691 break; 692 693 default: 694 error = EINVAL; 695 break; 696 } 697 break; 698 case NGM_CISCO_COOKIE: 699 switch (msg->header.cmd) { 700 case NGM_CISCO_GET_IPADDR: /* we understand this too */ 701 { 702 struct ifaddr *ifa; 703 704 /* Return the first configured IP address */ 705 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 706 struct ng_cisco_ipaddr *ips; 707 708 if (ifa->ifa_addr->sa_family != AF_INET) 709 continue; 710 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT); 711 if (resp == NULL) { 712 error = ENOMEM; 713 break; 714 } 715 ips = (struct ng_cisco_ipaddr *)resp->data; 716 ips->ipaddr = ((struct sockaddr_in *) 717 ifa->ifa_addr)->sin_addr; 718 ips->netmask = ((struct sockaddr_in *) 719 ifa->ifa_netmask)->sin_addr; 720 break; 721 } 722 723 /* No IP addresses on this interface? */ 724 if (ifa == NULL) 725 error = EADDRNOTAVAIL; 726 break; 727 } 728 default: 729 error = EINVAL; 730 break; 731 } 732 break; 733 default: 734 error = EINVAL; 735 break; 736 } 737 NG_RESPOND_MSG(error, node, item, resp); 738 NG_FREE_MSG(msg); 739 return (error); 740 } 741 742 /* 743 * Recive data from a hook. Pass the packet to the correct input routine. 744 */ 745 static int 746 ng_iface_rcvdata(hook_p hook, item_p item) 747 { 748 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 749 const iffam_p iffam = get_iffam_from_hook(priv, hook); 750 struct ifnet *const ifp = priv->ifp; 751 struct mbuf *m; 752 int isr; 753 754 NGI_GET_M(item, m); 755 NG_FREE_ITEM(item); 756 /* Sanity checks */ 757 KASSERT(iffam != NULL, ("%s: iffam", __func__)); 758 M_ASSERTPKTHDR(m); 759 if ((ifp->if_flags & IFF_UP) == 0) { 760 NG_FREE_M(m); 761 return (ENETDOWN); 762 } 763 764 /* Update interface stats */ 765 ifp->if_ipackets++; 766 ifp->if_ibytes += m->m_pkthdr.len; 767 768 /* Note receiving interface */ 769 m->m_pkthdr.rcvif = ifp; 770 771 /* Berkeley packet filter */ 772 ng_iface_bpftap(ifp, m, iffam->family); 773 774 /* Send packet */ 775 switch (iffam->family) { 776 #ifdef INET 777 case AF_INET: 778 isr = NETISR_IP; 779 break; 780 #endif 781 #ifdef INET6 782 case AF_INET6: 783 isr = NETISR_IPV6; 784 break; 785 #endif 786 #ifdef IPX 787 case AF_IPX: 788 isr = NETISR_IPX; 789 break; 790 #endif 791 #ifdef NETATALK 792 case AF_APPLETALK: 793 isr = NETISR_ATALK2; 794 break; 795 #endif 796 default: 797 m_freem(m); 798 return (EAFNOSUPPORT); 799 } 800 /* First chunk of an mbuf contains good junk */ 801 if (harvest.point_to_point) 802 random_harvest(m, 16, 3, 0, RANDOM_NET); 803 netisr_dispatch(isr, m); 804 return (0); 805 } 806 807 /* 808 * Shutdown and remove the node and its associated interface. 809 */ 810 static int 811 ng_iface_shutdown(node_p node) 812 { 813 const priv_p priv = NG_NODE_PRIVATE(node); 814 815 bpfdetach(priv->ifp); 816 if_detach(priv->ifp); 817 FREE(priv->ifp, M_NETGRAPH_IFACE); 818 priv->ifp = NULL; 819 ng_iface_free_unit(priv->unit); 820 FREE(priv, M_NETGRAPH_IFACE); 821 NG_NODE_SET_PRIVATE(node, NULL); 822 NG_NODE_UNREF(node); 823 return (0); 824 } 825 826 /* 827 * Hook disconnection. Note that we do *not* shutdown when all 828 * hooks have been disconnected. 829 */ 830 static int 831 ng_iface_disconnect(hook_p hook) 832 { 833 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 834 const iffam_p iffam = get_iffam_from_hook(priv, hook); 835 836 if (iffam == NULL) 837 panic(__func__); 838 *get_hook_from_iffam(priv, iffam) = NULL; 839 return (0); 840 } 841
Cache object: 91a5c516a96704e3485e42e377ef3268
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