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: src/sys/netgraph/ng_iface.c,v 1.48 2008/01/31 08:51:48 mav Exp $ 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, 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_inet.h" 56 #include "opt_inet6.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/random.h> 65 #include <sys/sockio.h> 66 #include <sys/socket.h> 67 #include <sys/syslog.h> 68 #include <sys/libkern.h> 69 70 #include <net/if.h> 71 #include <net/if_types.h> 72 #include <net/ifq_var.h> 73 #include <net/bpf.h> 74 #include <net/netisr.h> 75 76 #include <netinet/in.h> 77 78 #include <netgraph7/ng_message.h> 79 #include <netgraph7/netgraph.h> 80 #include <netgraph7/ng_parse.h> 81 #include <netgraph7/cisco/ng_cisco.h> 82 #include "ng_iface.h" 83 84 #ifdef NG_SEPARATE_MALLOC 85 MALLOC_DEFINE(M_NETGRAPH_IFACE, "netgraph_iface", "netgraph iface node "); 86 #else 87 #define M_NETGRAPH_IFACE M_NETGRAPH 88 #endif 89 90 /* This struct describes one address family */ 91 struct iffam { 92 sa_family_t family; /* Address family */ 93 const char *hookname; /* Name for hook */ 94 }; 95 typedef const struct iffam *iffam_p; 96 97 /* List of address families supported by our interface */ 98 static const struct iffam gFamilies[] = { 99 { AF_INET, NG_IFACE_HOOK_INET }, 100 { AF_INET6, NG_IFACE_HOOK_INET6 }, 101 { AF_ATM, NG_IFACE_HOOK_ATM }, 102 { AF_NATM, NG_IFACE_HOOK_NATM }, 103 }; 104 #define NUM_FAMILIES NELEM(gFamilies) 105 106 /* Node private data */ 107 struct ng_iface_private { 108 struct ifnet *ifp; /* Our interface */ 109 int unit; /* Interface unit number */ 110 node_p node; /* Our netgraph node */ 111 hook_p hooks[NUM_FAMILIES]; /* Hook for each address family */ 112 }; 113 typedef struct ng_iface_private *priv_p; 114 115 /* Interface methods */ 116 static void ng_iface_start(struct ifnet *ifp, struct ifaltq_subque *); 117 static int ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data, 118 struct ucred *cr); 119 static int ng_iface_output(struct ifnet *ifp, struct mbuf *m0, 120 struct sockaddr *dst, struct rtentry *rt0); 121 static void ng_iface_bpftap(struct ifnet *ifp, 122 struct mbuf *m, sa_family_t family); 123 static int ng_iface_send(struct ifnet *ifp, struct mbuf *m, 124 sa_family_t sa); 125 #ifdef DEBUG 126 static void ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data); 127 #endif 128 129 /* Netgraph methods */ 130 static int ng_iface_mod_event(module_t, int, void *); 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_cisco_ipaddr */ 145 static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[] 146 = NG_CISCO_IPADDR_TYPE_INFO; 147 static const struct ng_parse_type ng_cisco_ipaddr_type = { 148 &ng_parse_struct_type, 149 &ng_cisco_ipaddr_type_fields 150 }; 151 152 /* List of commands and how to convert arguments to/from ASCII */ 153 static const struct ng_cmdlist ng_iface_cmds[] = { 154 { 155 NGM_IFACE_COOKIE, 156 NGM_IFACE_GET_IFNAME, 157 "getifname", 158 NULL, 159 &ng_parse_string_type 160 }, 161 { 162 NGM_IFACE_COOKIE, 163 NGM_IFACE_POINT2POINT, 164 "point2point", 165 NULL, 166 NULL 167 }, 168 { 169 NGM_IFACE_COOKIE, 170 NGM_IFACE_BROADCAST, 171 "broadcast", 172 NULL, 173 NULL 174 }, 175 { 176 NGM_CISCO_COOKIE, 177 NGM_CISCO_GET_IPADDR, 178 "getipaddr", 179 NULL, 180 &ng_cisco_ipaddr_type 181 }, 182 { 183 NGM_IFACE_COOKIE, 184 NGM_IFACE_GET_IFINDEX, 185 "getifindex", 186 NULL, 187 &ng_parse_uint32_type 188 }, 189 { 0 } 190 }; 191 192 /* Node type descriptor */ 193 static struct ng_type typestruct = { 194 .version = NG_ABI_VERSION, 195 .name = NG_IFACE_NODE_TYPE, 196 .mod_event = ng_iface_mod_event, 197 .constructor = ng_iface_constructor, 198 .rcvmsg = ng_iface_rcvmsg, 199 .shutdown = ng_iface_shutdown, 200 .newhook = ng_iface_newhook, 201 .rcvdata = ng_iface_rcvdata, 202 .disconnect = ng_iface_disconnect, 203 .cmdlist = ng_iface_cmds, 204 }; 205 NETGRAPH_INIT(iface, &typestruct); 206 207 /* We keep a bitmap indicating which unit numbers are free. 208 One means the unit number is free, zero means it's taken. */ 209 static int *ng_iface_units = NULL; 210 static int ng_iface_units_len = 0; 211 212 #define UNITS_BITSPERWORD (sizeof(*ng_iface_units) * NBBY) 213 214 215 /************************************************************************ 216 HELPER STUFF 217 ************************************************************************/ 218 219 /* 220 * Get the family descriptor from the family ID 221 */ 222 static __inline iffam_p 223 get_iffam_from_af(sa_family_t family) 224 { 225 iffam_p iffam; 226 int k; 227 228 for (k = 0; k < NUM_FAMILIES; k++) { 229 iffam = &gFamilies[k]; 230 if (iffam->family == family) 231 return (iffam); 232 } 233 return (NULL); 234 } 235 236 /* 237 * Get the family descriptor from the hook 238 */ 239 static __inline iffam_p 240 get_iffam_from_hook(priv_p priv, hook_p hook) 241 { 242 int k; 243 244 for (k = 0; k < NUM_FAMILIES; k++) 245 if (priv->hooks[k] == hook) 246 return (&gFamilies[k]); 247 return (NULL); 248 } 249 250 /* 251 * Get the hook from the iffam descriptor 252 */ 253 254 static __inline hook_p * 255 get_hook_from_iffam(priv_p priv, iffam_p iffam) 256 { 257 return (&priv->hooks[iffam - gFamilies]); 258 } 259 260 /* 261 * Get the iffam descriptor from the name 262 */ 263 static __inline iffam_p 264 get_iffam_from_name(const char *name) 265 { 266 iffam_p iffam; 267 int k; 268 269 for (k = 0; k < NUM_FAMILIES; k++) { 270 iffam = &gFamilies[k]; 271 if (!strcmp(iffam->hookname, name)) 272 return (iffam); 273 } 274 return (NULL); 275 } 276 277 /* 278 * Find the first free unit number for a new interface. 279 * Increase the size of the unit bitmap as necessary. 280 */ 281 static __inline__ int 282 ng_iface_get_unit(int *unit) 283 { 284 int index, bit; 285 286 for (index = 0; index < ng_iface_units_len 287 && ng_iface_units[index] == 0; index++); 288 if (index == ng_iface_units_len) { /* extend array */ 289 int i, *newarray, newlen; 290 291 newlen = (2 * ng_iface_units_len) + 4; 292 newarray = kmalloc(newlen * sizeof(*ng_iface_units), 293 M_NETGRAPH_IFACE, M_NOWAIT); 294 if (newarray == NULL) 295 return (ENOMEM); 296 bcopy(ng_iface_units, newarray, 297 ng_iface_units_len * sizeof(*ng_iface_units)); 298 for (i = ng_iface_units_len; i < newlen; i++) 299 newarray[i] = ~0; 300 if (ng_iface_units != NULL) 301 kfree(ng_iface_units, M_NETGRAPH_IFACE); 302 ng_iface_units = newarray; 303 ng_iface_units_len = newlen; 304 } 305 bit = ffs(ng_iface_units[index]) - 1; 306 KASSERT(bit >= 0 && bit <= UNITS_BITSPERWORD - 1, 307 ("%s: word=%d bit=%d", __func__, ng_iface_units[index], bit)); 308 ng_iface_units[index] &= ~(1 << bit); 309 *unit = (index * UNITS_BITSPERWORD) + bit; 310 return (0); 311 } 312 313 /* 314 * Free a no longer needed unit number. 315 */ 316 static __inline__ void 317 ng_iface_free_unit(int unit) 318 { 319 int index, bit; 320 321 index = unit / UNITS_BITSPERWORD; 322 bit = unit % UNITS_BITSPERWORD; 323 KASSERT(index < ng_iface_units_len, 324 ("%s: unit=%d len=%d", __func__, unit, ng_iface_units_len)); 325 KASSERT((ng_iface_units[index] & (1 << bit)) == 0, 326 ("%s: unit=%d is free", __func__, unit)); 327 ng_iface_units[index] |= (1 << bit); 328 /* 329 * XXX We could think about reducing the size of ng_iface_units[] 330 * XXX here if the last portion is all ones 331 */ 332 } 333 334 /************************************************************************ 335 INTERFACE STUFF 336 ************************************************************************/ 337 338 /* 339 * Process an ioctl for the virtual interface 340 */ 341 static int 342 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data, 343 struct ucred *cr) 344 { 345 struct ifreq *const ifr = (struct ifreq *) data; 346 int error = 0; 347 348 #ifdef DEBUG 349 ng_iface_print_ioctl(ifp, command, data); 350 #endif 351 crit_enter(); 352 switch (command) { 353 354 /* These two are mostly handled at a higher layer */ 355 case SIOCSIFADDR: 356 ifp->if_flags |= IFF_UP; 357 ifp->if_flags |= IFF_RUNNING; 358 ifq_clr_oactive(&ifp->if_snd); 359 break; 360 case SIOCGIFADDR: 361 break; 362 363 /* Set flags */ 364 case SIOCSIFFLAGS: 365 /* 366 * If the interface is marked up and stopped, then start it. 367 * If it is marked down and running, then stop it. 368 */ 369 if (ifr->ifr_flags & IFF_UP) { 370 if (!(ifp->if_flags & IFF_RUNNING)) { 371 ifq_clr_oactive(&ifp->if_snd); 372 ifp->if_flags |= IFF_RUNNING; 373 } 374 } else { 375 if (ifp->if_flags & IFF_RUNNING) { 376 ifp->if_flags &= ~IFF_RUNNING; 377 ifq_clr_oactive(&ifp->if_snd); 378 } 379 } 380 break; 381 382 /* Set the interface MTU */ 383 case SIOCSIFMTU: 384 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX 385 || ifr->ifr_mtu < NG_IFACE_MTU_MIN) 386 error = EINVAL; 387 else 388 ifp->if_mtu = ifr->ifr_mtu; 389 break; 390 391 /* Stuff that's not supported */ 392 case SIOCADDMULTI: 393 case SIOCDELMULTI: 394 error = 0; 395 break; 396 case SIOCSIFPHYS: 397 error = EOPNOTSUPP; 398 break; 399 400 default: 401 error = EINVAL; 402 break; 403 } 404 crit_exit(); 405 return (error); 406 } 407 408 /* 409 * This routine is called to deliver a packet out the interface. 410 * We simply look at the address family and relay the packet to 411 * the corresponding hook, if it exists and is connected. 412 */ 413 414 static int 415 ng_iface_output(struct ifnet *ifp, struct mbuf *m, 416 struct sockaddr *dst, struct rtentry *rt0) 417 { 418 uint32_t af; 419 int error; 420 421 /* Check interface flags */ 422 if (!((ifp->if_flags & IFF_UP) && (ifp->if_flags & IFF_RUNNING))) { 423 m_freem(m); 424 return (ENETDOWN); 425 } 426 427 /* BPF writes need to be handled specially. */ 428 if (dst->sa_family == AF_UNSPEC) { 429 bcopy(dst->sa_data, &af, sizeof(af)); 430 dst->sa_family = af; 431 } 432 433 /* Berkeley packet filter */ 434 ng_iface_bpftap(ifp, m, dst->sa_family); 435 436 if (ifq_is_enabled(&ifp->if_snd)) { 437 M_PREPEND(m, sizeof(sa_family_t), M_NOWAIT); 438 if (m == NULL) { 439 IFNET_STAT_INC(ifp, oerrors, 1); 440 return (ENOBUFS); 441 } 442 *(sa_family_t *)m->m_data = dst->sa_family; 443 error = ifq_dispatch(ifp, m, NULL); 444 } else 445 error = ng_iface_send(ifp, m, dst->sa_family); 446 447 return (error); 448 } 449 450 /* 451 * Start method is used only when ALTQ is enabled. 452 */ 453 static void 454 ng_iface_start(struct ifnet *ifp, struct ifaltq_subque *ifsq) 455 { 456 sa_family_t sa; 457 458 KASSERT(ifq_is_enabled(&ifp->if_snd), ("%s without ALTQ", __func__)); 459 460 for(;;) { 461 struct mbuf *m; 462 463 m = ifq_dequeue(&ifp->if_snd); 464 if (m == NULL) 465 break; 466 sa = *mtod(m, sa_family_t *); 467 m_adj(m, sizeof(sa_family_t)); 468 ng_iface_send(ifp, m, sa); 469 } 470 } 471 472 /* 473 * Flash a packet by the BPF (requires prepending 4 byte AF header) 474 * Note the phoney mbuf; this is OK because BPF treats it read-only. 475 */ 476 static void 477 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family) 478 { 479 int32_t family4 = (int32_t)family; 480 481 KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__)); 482 483 if (ifp->if_bpf) { 484 bpf_gettoken(); 485 if (ifp->if_bpf) 486 bpf_ptap(ifp->if_bpf, m, &family4, sizeof(family4)); 487 bpf_reltoken(); 488 } 489 } 490 491 /* 492 * This routine does actual delivery of the packet into the 493 * netgraph(4). It is called from ng_iface_start() and 494 * ng_iface_output(). 495 */ 496 static int 497 ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa) 498 { 499 const priv_p priv = (priv_p) ifp->if_softc; 500 const iffam_p iffam = get_iffam_from_af(sa); 501 int error; 502 int len; 503 504 /* Check address family to determine hook (if known) */ 505 if (iffam == NULL) { 506 m_freem(m); 507 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa); 508 return (EAFNOSUPPORT); 509 } 510 511 /* Copy length before the mbuf gets invalidated. */ 512 len = m->m_pkthdr.len; 513 514 /* Send packet. If hook is not connected, 515 mbuf will get freed. */ 516 NG_SEND_DATA_ONLY(error, *get_hook_from_iffam(priv, iffam), m); 517 518 /* Update stats. */ 519 if (error == 0) { 520 IFNET_STAT_INC(ifp, obytes, len); 521 IFNET_STAT_INC(ifp, opackets, 1); 522 } 523 524 return (error); 525 } 526 527 #ifdef DEBUG 528 /* 529 * Display an ioctl to the virtual interface 530 */ 531 532 static void 533 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data) 534 { 535 char *str; 536 537 switch (command & IOC_DIRMASK) { 538 case IOC_VOID: 539 str = "IO"; 540 break; 541 case IOC_OUT: 542 str = "IOR"; 543 break; 544 case IOC_IN: 545 str = "IOW"; 546 break; 547 case IOC_INOUT: 548 str = "IORW"; 549 break; 550 default: 551 str = "IO??"; 552 } 553 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n", 554 ifp->if_xname, 555 str, 556 IOCGROUP(command), 557 command & 0xff, 558 IOCPARM_LEN(command)); 559 } 560 #endif /* DEBUG */ 561 562 /************************************************************************ 563 NETGRAPH NODE STUFF 564 ************************************************************************/ 565 566 /* 567 * Constructor for a node 568 */ 569 static int 570 ng_iface_constructor(node_p node) 571 { 572 struct ifnet *ifp; 573 priv_p priv; 574 int error; 575 576 /* Allocate node and interface private structures */ 577 priv = kmalloc(sizeof(*priv), M_NETGRAPH_IFACE, 578 M_WAITOK | M_NULLOK | M_ZERO); 579 if (priv == NULL) 580 return (ENOMEM); 581 ifp = kmalloc(sizeof(*ifp), M_NETGRAPH_IFACE, M_WAITOK | M_NULLOK | M_ZERO); 582 if (ifp == NULL) { 583 kfree(priv, M_NETGRAPH_IFACE); 584 return (ENOMEM); 585 } 586 587 /* Link them together */ 588 ifp->if_softc = priv; 589 priv->ifp = ifp; 590 591 /* Get an interface unit number */ 592 if ((error = ng_iface_get_unit(&priv->unit)) != 0) { 593 kfree(ifp, M_NETGRAPH_IFACE); 594 kfree(priv, M_NETGRAPH_IFACE); 595 return (error); 596 } 597 598 599 /* Link together node and private info */ 600 NG_NODE_SET_PRIVATE(node, priv); 601 priv->node = node; 602 603 /* Initialize interface structure */ 604 if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit); 605 ifp->if_output = ng_iface_output; 606 ifp->if_start = ng_iface_start; 607 ifp->if_ioctl = ng_iface_ioctl; 608 ifp->if_watchdog = NULL; 609 ifp->if_mtu = NG_IFACE_MTU_DEFAULT; 610 ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST); 611 ifp->if_type = IFT_PROPVIRTUAL; /* XXX */ 612 ifp->if_addrlen = 0; /* XXX */ 613 ifp->if_hdrlen = 0; /* XXX */ 614 ifp->if_baudrate = 64000; /* XXX */ 615 ifq_set_maxlen(&ifp->if_snd, IFQ_MAXLEN); 616 ifq_set_ready(&ifp->if_snd); 617 618 /* Give this node the same name as the interface (if possible) */ 619 if (ng_name_node(node, ifp->if_xname) != 0) 620 log(LOG_WARNING, "%s: can't acquire netgraph name\n", 621 ifp->if_xname); 622 623 /* Attach the interface */ 624 if_attach(ifp, NULL); 625 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t)); 626 627 /* Done */ 628 return (0); 629 } 630 631 /* 632 * Give our ok for a hook to be added 633 */ 634 static int 635 ng_iface_newhook(node_p node, hook_p hook, const char *name) 636 { 637 const iffam_p iffam = get_iffam_from_name(name); 638 hook_p *hookptr; 639 640 if (iffam == NULL) 641 return (EPFNOSUPPORT); 642 hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam); 643 if (*hookptr != NULL) 644 return (EISCONN); 645 *hookptr = hook; 646 NG_HOOK_HI_STACK(hook); 647 return (0); 648 } 649 650 /* 651 * Receive a control message 652 */ 653 static int 654 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook) 655 { 656 const priv_p priv = NG_NODE_PRIVATE(node); 657 struct ifnet *const ifp = priv->ifp; 658 struct ng_mesg *resp = NULL; 659 int error = 0; 660 struct ng_mesg *msg; 661 662 NGI_GET_MSG(item, msg); 663 switch (msg->header.typecookie) { 664 case NGM_IFACE_COOKIE: 665 switch (msg->header.cmd) { 666 case NGM_IFACE_GET_IFNAME: 667 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_WAITOK | M_NULLOK); 668 if (resp == NULL) { 669 error = ENOMEM; 670 break; 671 } 672 strlcpy(resp->data, ifp->if_xname, IFNAMSIZ); 673 break; 674 675 case NGM_IFACE_POINT2POINT: 676 case NGM_IFACE_BROADCAST: 677 { 678 679 /* Deny request if interface is UP */ 680 if ((ifp->if_flags & IFF_UP) != 0) 681 return (EBUSY); 682 683 /* Change flags */ 684 switch (msg->header.cmd) { 685 case NGM_IFACE_POINT2POINT: 686 ifp->if_flags |= IFF_POINTOPOINT; 687 ifp->if_flags &= ~IFF_BROADCAST; 688 break; 689 case NGM_IFACE_BROADCAST: 690 ifp->if_flags &= ~IFF_POINTOPOINT; 691 ifp->if_flags |= IFF_BROADCAST; 692 break; 693 } 694 break; 695 } 696 697 case NGM_IFACE_GET_IFINDEX: 698 NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_WAITOK | M_NULLOK); 699 if (resp == NULL) { 700 error = ENOMEM; 701 break; 702 } 703 *((uint32_t *)resp->data) = priv->ifp->if_index; 704 break; 705 706 default: 707 error = EINVAL; 708 break; 709 } 710 break; 711 case NGM_CISCO_COOKIE: 712 switch (msg->header.cmd) { 713 case NGM_CISCO_GET_IPADDR: /* we understand this too */ 714 { 715 struct ifaddr_container *ifac; 716 717 /* Return the first configured IP address */ 718 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 719 struct ifaddr *ifa = ifac->ifa; 720 struct ng_cisco_ipaddr *ips; 721 722 if (ifa->ifa_addr->sa_family != AF_INET) 723 continue; 724 NG_MKRESPONSE(resp, msg, sizeof(ips), M_WAITOK | M_NULLOK); 725 if (resp == NULL) { 726 error = ENOMEM; 727 break; 728 } 729 ips = (struct ng_cisco_ipaddr *)resp->data; 730 ips->ipaddr = ((struct sockaddr_in *) 731 ifa->ifa_addr)->sin_addr; 732 ips->netmask = ((struct sockaddr_in *) 733 ifa->ifa_netmask)->sin_addr; 734 break; 735 } 736 737 /* No IP addresses on this interface? */ 738 if (ifac == NULL) 739 error = EADDRNOTAVAIL; 740 break; 741 } 742 default: 743 error = EINVAL; 744 break; 745 } 746 break; 747 case NGM_FLOW_COOKIE: 748 switch (msg->header.cmd) { 749 case NGM_LINK_IS_UP: 750 ifp->if_flags |= IFF_RUNNING; 751 break; 752 case NGM_LINK_IS_DOWN: 753 ifp->if_flags &= ~IFF_RUNNING; 754 break; 755 default: 756 break; 757 } 758 break; 759 default: 760 error = EINVAL; 761 break; 762 } 763 NG_RESPOND_MSG(error, node, item, resp); 764 NG_FREE_MSG(msg); 765 return (error); 766 } 767 768 /* 769 * Recive data from a hook. Pass the packet to the correct input routine. 770 */ 771 static int 772 ng_iface_rcvdata(hook_p hook, item_p item) 773 { 774 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 775 const iffam_p iffam = get_iffam_from_hook(priv, hook); 776 struct ifnet *const ifp = priv->ifp; 777 struct mbuf *m; 778 int isr; 779 780 NGI_GET_M(item, m); 781 NG_FREE_ITEM(item); 782 /* Sanity checks */ 783 KASSERT(iffam != NULL, ("%s: iffam", __func__)); 784 M_ASSERTPKTHDR(m); 785 if ((ifp->if_flags & IFF_UP) == 0) { 786 NG_FREE_M(m); 787 return (ENETDOWN); 788 } 789 790 /* Update interface stats */ 791 IFNET_STAT_INC(ifp, ipackets, 1); 792 IFNET_STAT_INC(ifp, ibytes, m->m_pkthdr.len); 793 794 /* Note receiving interface */ 795 m->m_pkthdr.rcvif = ifp; 796 797 /* Berkeley packet filter */ 798 ng_iface_bpftap(ifp, m, iffam->family); 799 800 /* Send packet */ 801 switch (iffam->family) { 802 #ifdef INET 803 case AF_INET: 804 isr = NETISR_IP; 805 break; 806 #endif 807 #ifdef INET6 808 case AF_INET6: 809 isr = NETISR_IPV6; 810 break; 811 #endif 812 default: 813 m_freem(m); 814 return (EAFNOSUPPORT); 815 } 816 #if 0 817 /* First chunk of an mbuf contains good junk */ 818 if (harvest.point_to_point) 819 random_harvest(m, 16, 3, 0, RANDOM_NET); 820 #endif 821 m->m_flags &= ~M_HASH; 822 netisr_queue(isr, m); 823 return (0); 824 } 825 826 /* 827 * Shutdown and remove the node and its associated interface. 828 */ 829 static int 830 ng_iface_shutdown(node_p node) 831 { 832 const priv_p priv = NG_NODE_PRIVATE(node); 833 834 bpfdetach(priv->ifp); 835 if_detach(priv->ifp); 836 kfree(priv->ifp, M_NETGRAPH_IFACE); 837 priv->ifp = NULL; 838 ng_iface_free_unit(priv->unit); 839 kfree(priv, M_NETGRAPH_IFACE); 840 NG_NODE_SET_PRIVATE(node, NULL); 841 NG_NODE_UNREF(node); 842 return (0); 843 } 844 845 /* 846 * Hook disconnection. Note that we do *not* shutdown when all 847 * hooks have been disconnected. 848 */ 849 static int 850 ng_iface_disconnect(hook_p hook) 851 { 852 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 853 const iffam_p iffam = get_iffam_from_hook(priv, hook); 854 855 if (iffam == NULL) 856 panic(__func__); 857 *get_hook_from_iffam(priv, iffam) = NULL; 858 return (0); 859 } 860 861 /* 862 * Handle loading and unloading for this node type. 863 */ 864 static int 865 ng_iface_mod_event(module_t mod, int event, void *data) 866 { 867 int error = 0; 868 869 switch (event) { 870 case MOD_LOAD: 871 break; 872 case MOD_UNLOAD: 873 break; 874 default: 875 error = EOPNOTSUPP; 876 break; 877 } 878 return (error); 879 } 880