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sys/netgraph/ng_iface.c
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1 /* 2 * ng_iface.c 3 */ 4 5 /*- 6 * Copyright (c) 1996-1999 Whistle Communications, Inc. 7 * All rights reserved. 8 * 9 * Subject to the following obligations and disclaimer of warranty, use and 10 * redistribution of this software, in source or object code forms, with or 11 * without modifications are expressly permitted by Whistle Communications; 12 * provided, however, that: 13 * 1. Any and all reproductions of the source or object code must include the 14 * copyright notice above and the following disclaimer of warranties; and 15 * 2. No rights are granted, in any manner or form, to use Whistle 16 * Communications, Inc. trademarks, including the mark "WHISTLE 17 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 18 * such appears in the above copyright notice or in the software. 19 * 20 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 21 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 22 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 23 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 24 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 25 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 26 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 27 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 28 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 29 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 30 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 31 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 32 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 35 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 36 * OF SUCH DAMAGE. 37 * 38 * Author: Archie Cobbs <archie@freebsd.org> 39 * 40 * $FreeBSD: releng/5.4/sys/netgraph/ng_iface.c 141090 2005-01-31 23:27:04Z imp $ 41 * $Whistle: ng_iface.c,v 1.33 1999/11/01 09:24:51 julian Exp $ 42 */ 43 44 /* 45 * This node is also a system networking interface. It has 46 * a hook for each protocol (IP, AppleTalk, IPX, etc). Packets 47 * are simply relayed between the interface and the hooks. 48 * 49 * Interfaces are named ng0, ng1, etc. New nodes take the 50 * first available interface name. 51 * 52 * This node also includes Berkeley packet filter support. 53 */ 54 55 #include "opt_atalk.h" 56 #include "opt_inet.h" 57 #include "opt_inet6.h" 58 #include "opt_ipx.h" 59 60 #include <sys/param.h> 61 #include <sys/systm.h> 62 #include <sys/errno.h> 63 #include <sys/kernel.h> 64 #include <sys/lock.h> 65 #include <sys/malloc.h> 66 #include <sys/mbuf.h> 67 #include <sys/mutex.h> 68 #include <sys/errno.h> 69 #include <sys/random.h> 70 #include <sys/sockio.h> 71 #include <sys/socket.h> 72 #include <sys/syslog.h> 73 #include <sys/libkern.h> 74 75 #include <net/if.h> 76 #include <net/if_types.h> 77 #include <net/bpf.h> 78 #include <net/netisr.h> 79 80 #include <netinet/in.h> 81 82 #include <netgraph/ng_message.h> 83 #include <netgraph/netgraph.h> 84 #include <netgraph/ng_parse.h> 85 #include <netgraph/ng_iface.h> 86 #include <netgraph/ng_cisco.h> 87 88 #ifdef NG_SEPARATE_MALLOC 89 MALLOC_DEFINE(M_NETGRAPH_IFACE, "netgraph_iface", "netgraph iface node "); 90 #else 91 #define M_NETGRAPH_IFACE M_NETGRAPH 92 #endif 93 94 /* This struct describes one address family */ 95 struct iffam { 96 sa_family_t family; /* Address family */ 97 const char *hookname; /* Name for hook */ 98 }; 99 typedef const struct iffam *iffam_p; 100 101 /* List of address families supported by our interface */ 102 const static struct iffam gFamilies[] = { 103 { AF_INET, NG_IFACE_HOOK_INET }, 104 { AF_INET6, NG_IFACE_HOOK_INET6 }, 105 { AF_APPLETALK, NG_IFACE_HOOK_ATALK }, 106 { AF_IPX, NG_IFACE_HOOK_IPX }, 107 { AF_ATM, NG_IFACE_HOOK_ATM }, 108 { AF_NATM, NG_IFACE_HOOK_NATM }, 109 }; 110 #define NUM_FAMILIES (sizeof(gFamilies) / sizeof(*gFamilies)) 111 112 /* Node private data */ 113 struct ng_iface_private { 114 struct ifnet *ifp; /* Our interface */ 115 int unit; /* Interface unit number */ 116 node_p node; /* Our netgraph node */ 117 hook_p hooks[NUM_FAMILIES]; /* Hook for each address family */ 118 }; 119 typedef struct ng_iface_private *priv_p; 120 121 /* Interface methods */ 122 static void ng_iface_start(struct ifnet *ifp); 123 static int ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data); 124 static int ng_iface_output(struct ifnet *ifp, struct mbuf *m0, 125 struct sockaddr *dst, struct rtentry *rt0); 126 static void ng_iface_bpftap(struct ifnet *ifp, 127 struct mbuf *m, sa_family_t family); 128 #ifdef DEBUG 129 static void ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data); 130 #endif 131 132 /* Netgraph methods */ 133 static ng_constructor_t ng_iface_constructor; 134 static ng_rcvmsg_t ng_iface_rcvmsg; 135 static ng_shutdown_t ng_iface_shutdown; 136 static ng_newhook_t ng_iface_newhook; 137 static ng_rcvdata_t ng_iface_rcvdata; 138 static ng_disconnect_t ng_iface_disconnect; 139 140 /* Helper stuff */ 141 static iffam_p get_iffam_from_af(sa_family_t family); 142 static iffam_p get_iffam_from_hook(priv_p priv, hook_p hook); 143 static iffam_p get_iffam_from_name(const char *name); 144 static hook_p *get_hook_from_iffam(priv_p priv, iffam_p iffam); 145 146 /* Parse type for struct ng_iface_ifname */ 147 static const struct ng_parse_fixedstring_info ng_iface_ifname_info = { 148 NG_IFACE_IFACE_NAME_MAX + 1 149 }; 150 static const struct ng_parse_type ng_iface_ifname_type = { 151 &ng_parse_fixedstring_type, 152 &ng_iface_ifname_info 153 }; 154 155 /* Parse type for struct ng_cisco_ipaddr */ 156 static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[] 157 = NG_CISCO_IPADDR_TYPE_INFO; 158 static const struct ng_parse_type ng_cisco_ipaddr_type = { 159 &ng_parse_struct_type, 160 &ng_cisco_ipaddr_type_fields 161 }; 162 163 /* List of commands and how to convert arguments to/from ASCII */ 164 static const struct ng_cmdlist ng_iface_cmds[] = { 165 { 166 NGM_IFACE_COOKIE, 167 NGM_IFACE_GET_IFNAME, 168 "getifname", 169 NULL, 170 &ng_iface_ifname_type 171 }, 172 { 173 NGM_IFACE_COOKIE, 174 NGM_IFACE_POINT2POINT, 175 "point2point", 176 NULL, 177 NULL 178 }, 179 { 180 NGM_IFACE_COOKIE, 181 NGM_IFACE_BROADCAST, 182 "broadcast", 183 NULL, 184 NULL 185 }, 186 { 187 NGM_CISCO_COOKIE, 188 NGM_CISCO_GET_IPADDR, 189 "getipaddr", 190 NULL, 191 &ng_cisco_ipaddr_type 192 }, 193 { 194 NGM_IFACE_COOKIE, 195 NGM_IFACE_GET_IFINDEX, 196 "getifindex", 197 NULL, 198 &ng_parse_uint32_type 199 }, 200 { 0 } 201 }; 202 203 /* Node type descriptor */ 204 static struct ng_type typestruct = { 205 .version = NG_ABI_VERSION, 206 .name = NG_IFACE_NODE_TYPE, 207 .constructor = ng_iface_constructor, 208 .rcvmsg = ng_iface_rcvmsg, 209 .shutdown = ng_iface_shutdown, 210 .newhook = ng_iface_newhook, 211 .rcvdata = ng_iface_rcvdata, 212 .disconnect = ng_iface_disconnect, 213 .cmdlist = ng_iface_cmds, 214 }; 215 NETGRAPH_INIT(iface, &typestruct); 216 217 /* We keep a bitmap indicating which unit numbers are free. 218 One means the unit number is free, zero means it's taken. */ 219 static int *ng_iface_units = NULL; 220 static int ng_iface_units_len = 0; 221 static int ng_units_in_use = 0; 222 223 #define UNITS_BITSPERWORD (sizeof(*ng_iface_units) * NBBY) 224 225 static struct mtx ng_iface_mtx; 226 MTX_SYSINIT(ng_iface, &ng_iface_mtx, "ng_iface", MTX_DEF); 227 228 /************************************************************************ 229 HELPER STUFF 230 ************************************************************************/ 231 232 /* 233 * Get the family descriptor from the family ID 234 */ 235 static __inline iffam_p 236 get_iffam_from_af(sa_family_t family) 237 { 238 iffam_p iffam; 239 int k; 240 241 for (k = 0; k < NUM_FAMILIES; k++) { 242 iffam = &gFamilies[k]; 243 if (iffam->family == family) 244 return (iffam); 245 } 246 return (NULL); 247 } 248 249 /* 250 * Get the family descriptor from the hook 251 */ 252 static __inline iffam_p 253 get_iffam_from_hook(priv_p priv, hook_p hook) 254 { 255 int k; 256 257 for (k = 0; k < NUM_FAMILIES; k++) 258 if (priv->hooks[k] == hook) 259 return (&gFamilies[k]); 260 return (NULL); 261 } 262 263 /* 264 * Get the hook from the iffam descriptor 265 */ 266 267 static __inline hook_p * 268 get_hook_from_iffam(priv_p priv, iffam_p iffam) 269 { 270 return (&priv->hooks[iffam - gFamilies]); 271 } 272 273 /* 274 * Get the iffam descriptor from the name 275 */ 276 static __inline iffam_p 277 get_iffam_from_name(const char *name) 278 { 279 iffam_p iffam; 280 int k; 281 282 for (k = 0; k < NUM_FAMILIES; k++) { 283 iffam = &gFamilies[k]; 284 if (!strcmp(iffam->hookname, name)) 285 return (iffam); 286 } 287 return (NULL); 288 } 289 290 /* 291 * Find the first free unit number for a new interface. 292 * Increase the size of the unit bitmap as necessary. 293 */ 294 static __inline int 295 ng_iface_get_unit(int *unit) 296 { 297 int index, bit; 298 299 mtx_lock(&ng_iface_mtx); 300 for (index = 0; index < ng_iface_units_len 301 && ng_iface_units[index] == 0; index++); 302 if (index == ng_iface_units_len) { /* extend array */ 303 int i, *newarray, newlen; 304 305 newlen = (2 * ng_iface_units_len) + 4; 306 MALLOC(newarray, int *, newlen * sizeof(*ng_iface_units), 307 M_NETGRAPH_IFACE, M_NOWAIT); 308 if (newarray == NULL) { 309 mtx_unlock(&ng_iface_mtx); 310 return (ENOMEM); 311 } 312 bcopy(ng_iface_units, newarray, 313 ng_iface_units_len * sizeof(*ng_iface_units)); 314 for (i = ng_iface_units_len; i < newlen; i++) 315 newarray[i] = ~0; 316 if (ng_iface_units != NULL) 317 FREE(ng_iface_units, M_NETGRAPH_IFACE); 318 ng_iface_units = newarray; 319 ng_iface_units_len = newlen; 320 } 321 bit = ffs(ng_iface_units[index]) - 1; 322 KASSERT(bit >= 0 && bit <= UNITS_BITSPERWORD - 1, 323 ("%s: word=%d bit=%d", __func__, ng_iface_units[index], bit)); 324 ng_iface_units[index] &= ~(1 << bit); 325 *unit = (index * UNITS_BITSPERWORD) + bit; 326 ng_units_in_use++; 327 mtx_unlock(&ng_iface_mtx); 328 return (0); 329 } 330 331 /* 332 * Free a no longer needed unit number. 333 */ 334 static __inline void 335 ng_iface_free_unit(int unit) 336 { 337 int index, bit; 338 339 index = unit / UNITS_BITSPERWORD; 340 bit = unit % UNITS_BITSPERWORD; 341 mtx_lock(&ng_iface_mtx); 342 KASSERT(index < ng_iface_units_len, 343 ("%s: unit=%d len=%d", __func__, unit, ng_iface_units_len)); 344 KASSERT((ng_iface_units[index] & (1 << bit)) == 0, 345 ("%s: unit=%d is free", __func__, unit)); 346 ng_iface_units[index] |= (1 << bit); 347 /* 348 * XXX We could think about reducing the size of ng_iface_units[] 349 * XXX here if the last portion is all ones 350 * XXX At least free it if no more units. 351 * Needed if we are to eventually be able to unload. 352 */ 353 ng_units_in_use--; 354 if (ng_units_in_use == 0) { /* XXX make SMP safe */ 355 FREE(ng_iface_units, M_NETGRAPH_IFACE); 356 ng_iface_units_len = 0; 357 ng_iface_units = NULL; 358 } 359 mtx_unlock(&ng_iface_mtx); 360 } 361 362 /************************************************************************ 363 INTERFACE STUFF 364 ************************************************************************/ 365 366 /* 367 * Process an ioctl for the virtual interface 368 */ 369 static int 370 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data) 371 { 372 struct ifreq *const ifr = (struct ifreq *) data; 373 int s, error = 0; 374 375 #ifdef DEBUG 376 ng_iface_print_ioctl(ifp, command, data); 377 #endif 378 s = splimp(); 379 switch (command) { 380 381 /* These two are mostly handled at a higher layer */ 382 case SIOCSIFADDR: 383 ifp->if_flags |= (IFF_UP | IFF_RUNNING); 384 ifp->if_flags &= ~(IFF_OACTIVE); 385 break; 386 case SIOCGIFADDR: 387 break; 388 389 /* Set flags */ 390 case SIOCSIFFLAGS: 391 /* 392 * If the interface is marked up and stopped, then start it. 393 * If it is marked down and running, then stop it. 394 */ 395 if (ifr->ifr_flags & IFF_UP) { 396 if (!(ifp->if_flags & IFF_RUNNING)) { 397 ifp->if_flags &= ~(IFF_OACTIVE); 398 ifp->if_flags |= IFF_RUNNING; 399 } 400 } else { 401 if (ifp->if_flags & IFF_RUNNING) 402 ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE); 403 } 404 break; 405 406 /* Set the interface MTU */ 407 case SIOCSIFMTU: 408 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX 409 || ifr->ifr_mtu < NG_IFACE_MTU_MIN) 410 error = EINVAL; 411 else 412 ifp->if_mtu = ifr->ifr_mtu; 413 break; 414 415 /* Stuff that's not supported */ 416 case SIOCADDMULTI: 417 case SIOCDELMULTI: 418 error = 0; 419 break; 420 case SIOCSIFPHYS: 421 error = EOPNOTSUPP; 422 break; 423 424 default: 425 error = EINVAL; 426 break; 427 } 428 (void) splx(s); 429 return (error); 430 } 431 432 /* 433 * This routine is called to deliver a packet out the interface. 434 * We simply look at the address family and relay the packet to 435 * the corresponding hook, if it exists and is connected. 436 */ 437 438 static int 439 ng_iface_output(struct ifnet *ifp, struct mbuf *m, 440 struct sockaddr *dst, struct rtentry *rt0) 441 { 442 const priv_p priv = (priv_p) ifp->if_softc; 443 const iffam_p iffam = get_iffam_from_af(dst->sa_family); 444 int len, error = 0; 445 446 /* Check interface flags */ 447 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { 448 m_freem(m); 449 return (ENETDOWN); 450 } 451 452 /* BPF writes need to be handled specially */ 453 if (dst->sa_family == AF_UNSPEC) { 454 if (m->m_len < 4 && (m = m_pullup(m, 4)) == NULL) 455 return (ENOBUFS); 456 dst->sa_family = (sa_family_t)*mtod(m, int32_t *); 457 m->m_data += 4; 458 m->m_len -= 4; 459 m->m_pkthdr.len -= 4; 460 } 461 462 /* Berkeley packet filter */ 463 ng_iface_bpftap(ifp, m, dst->sa_family); 464 465 /* Check address family to determine hook (if known) */ 466 if (iffam == NULL) { 467 m_freem(m); 468 log(LOG_WARNING, "%s: can't handle af%d\n", 469 ifp->if_xname, (int)dst->sa_family); 470 return (EAFNOSUPPORT); 471 } 472 473 /* Copy length before the mbuf gets invalidated */ 474 len = m->m_pkthdr.len; 475 476 /* Send packet; if hook is not connected, mbuf will get freed. */ 477 NG_SEND_DATA_ONLY(error, *get_hook_from_iffam(priv, iffam), m); 478 479 /* Update stats */ 480 if (error == 0) { 481 ifp->if_obytes += len; 482 ifp->if_opackets++; 483 } 484 return (error); 485 } 486 487 /* 488 * This routine should never be called 489 */ 490 491 static void 492 ng_iface_start(struct ifnet *ifp) 493 { 494 if_printf(ifp, "%s called?", __func__); 495 } 496 497 /* 498 * Flash a packet by the BPF (requires prepending 4 byte AF header) 499 * Note the phoney mbuf; this is OK because BPF treats it read-only. 500 */ 501 static void 502 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family) 503 { 504 KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__)); 505 if (ifp->if_bpf != NULL) { 506 int32_t family4 = (int32_t)family; 507 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m); 508 } 509 } 510 511 #ifdef DEBUG 512 /* 513 * Display an ioctl to the virtual interface 514 */ 515 516 static void 517 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data) 518 { 519 char *str; 520 521 switch (command & IOC_DIRMASK) { 522 case IOC_VOID: 523 str = "IO"; 524 break; 525 case IOC_OUT: 526 str = "IOR"; 527 break; 528 case IOC_IN: 529 str = "IOW"; 530 break; 531 case IOC_INOUT: 532 str = "IORW"; 533 break; 534 default: 535 str = "IO??"; 536 } 537 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n", 538 ifp->if_xname, 539 str, 540 IOCGROUP(command), 541 command & 0xff, 542 IOCPARM_LEN(command)); 543 } 544 #endif /* DEBUG */ 545 546 /************************************************************************ 547 NETGRAPH NODE STUFF 548 ************************************************************************/ 549 550 /* 551 * Constructor for a node 552 */ 553 static int 554 ng_iface_constructor(node_p node) 555 { 556 char ifname[NG_IFACE_IFACE_NAME_MAX + 1]; 557 struct ifnet *ifp; 558 priv_p priv; 559 int error = 0; 560 561 /* Allocate node and interface private structures */ 562 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH_IFACE, M_NOWAIT|M_ZERO); 563 if (priv == NULL) 564 return (ENOMEM); 565 MALLOC(ifp, struct ifnet *, sizeof(*ifp), M_NETGRAPH_IFACE, M_NOWAIT|M_ZERO); 566 if (ifp == NULL) { 567 FREE(priv, M_NETGRAPH_IFACE); 568 return (ENOMEM); 569 } 570 571 /* Link them together */ 572 ifp->if_softc = priv; 573 priv->ifp = ifp; 574 575 /* Get an interface unit number */ 576 if ((error = ng_iface_get_unit(&priv->unit)) != 0) { 577 FREE(ifp, M_NETGRAPH_IFACE); 578 FREE(priv, M_NETGRAPH_IFACE); 579 return (error); 580 } 581 582 /* Link together node and private info */ 583 NG_NODE_SET_PRIVATE(node, priv); 584 priv->node = node; 585 586 /* Initialize interface structure */ 587 if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit); 588 ifp->if_output = ng_iface_output; 589 ifp->if_start = ng_iface_start; 590 ifp->if_ioctl = ng_iface_ioctl; 591 ifp->if_watchdog = NULL; 592 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN; 593 ifp->if_mtu = NG_IFACE_MTU_DEFAULT; 594 ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST); 595 ifp->if_type = IFT_PROPVIRTUAL; /* XXX */ 596 ifp->if_addrlen = 0; /* XXX */ 597 ifp->if_hdrlen = 0; /* XXX */ 598 ifp->if_baudrate = 64000; /* XXX */ 599 TAILQ_INIT(&ifp->if_addrhead); 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); 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(NG_NODE_PRIVATE(node), 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, item_p item, hook_p lasthook) 638 { 639 const priv_p priv = NG_NODE_PRIVATE(node); 640 struct ifnet *const ifp = priv->ifp; 641 struct ng_mesg *resp = NULL; 642 int error = 0; 643 struct ng_mesg *msg; 644 645 NGI_GET_MSG(item, msg); 646 switch (msg->header.typecookie) { 647 case NGM_IFACE_COOKIE: 648 switch (msg->header.cmd) { 649 case NGM_IFACE_GET_IFNAME: 650 { 651 struct ng_iface_ifname *arg; 652 653 NG_MKRESPONSE(resp, msg, sizeof(*arg), M_NOWAIT); 654 if (resp == NULL) { 655 error = ENOMEM; 656 break; 657 } 658 arg = (struct ng_iface_ifname *)resp->data; 659 strlcpy(arg->ngif_name, ifp->if_xname, 660 sizeof(arg->ngif_name)); 661 break; 662 } 663 664 case NGM_IFACE_POINT2POINT: 665 case NGM_IFACE_BROADCAST: 666 { 667 668 /* Deny request if interface is UP */ 669 if ((ifp->if_flags & IFF_UP) != 0) 670 return (EBUSY); 671 672 /* Change flags */ 673 switch (msg->header.cmd) { 674 case NGM_IFACE_POINT2POINT: 675 ifp->if_flags |= IFF_POINTOPOINT; 676 ifp->if_flags &= ~IFF_BROADCAST; 677 break; 678 case NGM_IFACE_BROADCAST: 679 ifp->if_flags &= ~IFF_POINTOPOINT; 680 ifp->if_flags |= IFF_BROADCAST; 681 break; 682 } 683 break; 684 } 685 686 case NGM_IFACE_GET_IFINDEX: 687 NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT); 688 if (resp == NULL) { 689 error = ENOMEM; 690 break; 691 } 692 *((uint32_t *)resp->data) = priv->ifp->if_index; 693 break; 694 695 default: 696 error = EINVAL; 697 break; 698 } 699 break; 700 case NGM_CISCO_COOKIE: 701 switch (msg->header.cmd) { 702 case NGM_CISCO_GET_IPADDR: /* we understand this too */ 703 { 704 struct ifaddr *ifa; 705 706 /* Return the first configured IP address */ 707 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 708 struct ng_cisco_ipaddr *ips; 709 710 if (ifa->ifa_addr->sa_family != AF_INET) 711 continue; 712 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT); 713 if (resp == NULL) { 714 error = ENOMEM; 715 break; 716 } 717 ips = (struct ng_cisco_ipaddr *)resp->data; 718 ips->ipaddr = ((struct sockaddr_in *) 719 ifa->ifa_addr)->sin_addr; 720 ips->netmask = ((struct sockaddr_in *) 721 ifa->ifa_netmask)->sin_addr; 722 break; 723 } 724 725 /* No IP addresses on this interface? */ 726 if (ifa == NULL) 727 error = EADDRNOTAVAIL; 728 break; 729 } 730 default: 731 error = EINVAL; 732 break; 733 } 734 break; 735 case NGM_FLOW_COOKIE: 736 switch (msg->header.cmd) { 737 case NGM_LINK_IS_UP: 738 ifp->if_flags |= IFF_UP; 739 break; 740 case NGM_LINK_IS_DOWN: 741 ifp->if_flags &= ~IFF_UP; 742 break; 743 default: 744 break; 745 } 746 break; 747 default: 748 error = EINVAL; 749 break; 750 } 751 NG_RESPOND_MSG(error, node, item, resp); 752 NG_FREE_MSG(msg); 753 return (error); 754 } 755 756 /* 757 * Recive data from a hook. Pass the packet to the correct input routine. 758 */ 759 static int 760 ng_iface_rcvdata(hook_p hook, item_p item) 761 { 762 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 763 const iffam_p iffam = get_iffam_from_hook(priv, hook); 764 struct ifnet *const ifp = priv->ifp; 765 struct mbuf *m; 766 int isr; 767 768 NGI_GET_M(item, m); 769 NG_FREE_ITEM(item); 770 /* Sanity checks */ 771 KASSERT(iffam != NULL, ("%s: iffam", __func__)); 772 M_ASSERTPKTHDR(m); 773 if ((ifp->if_flags & IFF_UP) == 0) { 774 NG_FREE_M(m); 775 return (ENETDOWN); 776 } 777 778 /* Update interface stats */ 779 ifp->if_ipackets++; 780 ifp->if_ibytes += m->m_pkthdr.len; 781 782 /* Note receiving interface */ 783 m->m_pkthdr.rcvif = ifp; 784 785 /* Berkeley packet filter */ 786 ng_iface_bpftap(ifp, m, iffam->family); 787 788 /* Send packet */ 789 switch (iffam->family) { 790 #ifdef INET 791 case AF_INET: 792 isr = NETISR_IP; 793 break; 794 #endif 795 #ifdef INET6 796 case AF_INET6: 797 isr = NETISR_IPV6; 798 break; 799 #endif 800 #ifdef IPX 801 case AF_IPX: 802 isr = NETISR_IPX; 803 break; 804 #endif 805 #ifdef NETATALK 806 case AF_APPLETALK: 807 isr = NETISR_ATALK2; 808 break; 809 #endif 810 default: 811 m_freem(m); 812 return (EAFNOSUPPORT); 813 } 814 /* First chunk of an mbuf contains good junk */ 815 if (harvest.point_to_point) 816 random_harvest(m, 16, 3, 0, RANDOM_NET); 817 netisr_dispatch(isr, m); 818 return (0); 819 } 820 821 /* 822 * Shutdown and remove the node and its associated interface. 823 */ 824 static int 825 ng_iface_shutdown(node_p node) 826 { 827 const priv_p priv = NG_NODE_PRIVATE(node); 828 829 bpfdetach(priv->ifp); 830 if_detach(priv->ifp); 831 FREE(priv->ifp, M_NETGRAPH_IFACE); 832 priv->ifp = NULL; 833 ng_iface_free_unit(priv->unit); 834 FREE(priv, M_NETGRAPH_IFACE); 835 NG_NODE_SET_PRIVATE(node, NULL); 836 NG_NODE_UNREF(node); 837 return (0); 838 } 839 840 /* 841 * Hook disconnection. Note that we do *not* shutdown when all 842 * hooks have been disconnected. 843 */ 844 static int 845 ng_iface_disconnect(hook_p hook) 846 { 847 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 848 const iffam_p iffam = get_iffam_from_hook(priv, hook); 849 850 if (iffam == NULL) 851 panic(__func__); 852 *get_hook_from_iffam(priv, iffam) = NULL; 853 return (0); 854 } 855
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