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, 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_inet.h" 56 #include "opt_inet6.h" 57 #include "opt_ipx.h" 58 59 #include <sys/param.h> 60 #include <sys/systm.h> 61 #include <sys/errno.h> 62 #include <sys/kernel.h> 63 #include <sys/malloc.h> 64 #include <sys/mbuf.h> 65 #include <sys/errno.h> 66 #include <sys/random.h> 67 #include <sys/sockio.h> 68 #include <sys/socket.h> 69 #include <sys/syslog.h> 70 #include <sys/libkern.h> 71 72 #include <net/if.h> 73 #include <net/if_types.h> 74 #include <net/ifq_var.h> 75 #include <net/bpf.h> 76 #include <net/netisr.h> 77 78 #include <netinet/in.h> 79 80 #include <netgraph7/ng_message.h> 81 #include <netgraph7/netgraph.h> 82 #include <netgraph7/ng_parse.h> 83 #include <netgraph7/cisco/ng_cisco.h> 84 #include "ng_iface.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 static const struct iffam gFamilies[] = { 101 { AF_INET, NG_IFACE_HOOK_INET }, 102 { AF_INET6, NG_IFACE_HOOK_INET6 }, 103 { AF_IPX, NG_IFACE_HOOK_IPX }, 104 { AF_ATM, NG_IFACE_HOOK_ATM }, 105 { AF_NATM, NG_IFACE_HOOK_NATM }, 106 }; 107 #define NUM_FAMILIES NELEM(gFamilies) 108 109 /* Node private data */ 110 struct ng_iface_private { 111 struct ifnet *ifp; /* Our interface */ 112 int unit; /* Interface unit number */ 113 node_p node; /* Our netgraph node */ 114 hook_p hooks[NUM_FAMILIES]; /* Hook for each address family */ 115 }; 116 typedef struct ng_iface_private *priv_p; 117 118 /* Interface methods */ 119 static void ng_iface_start(struct ifnet *ifp, struct ifaltq_subque *); 120 static int ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data, 121 struct ucred *cr); 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 static int ng_iface_send(struct ifnet *ifp, struct mbuf *m, 127 sa_family_t sa); 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 int ng_iface_mod_event(module_t, int, void *); 134 static ng_constructor_t ng_iface_constructor; 135 static ng_rcvmsg_t ng_iface_rcvmsg; 136 static ng_shutdown_t ng_iface_shutdown; 137 static ng_newhook_t ng_iface_newhook; 138 static ng_rcvdata_t ng_iface_rcvdata; 139 static ng_disconnect_t ng_iface_disconnect; 140 141 /* Helper stuff */ 142 static iffam_p get_iffam_from_af(sa_family_t family); 143 static iffam_p get_iffam_from_hook(priv_p priv, hook_p hook); 144 static iffam_p get_iffam_from_name(const char *name); 145 static hook_p *get_hook_from_iffam(priv_p priv, iffam_p iffam); 146 147 /* Parse type for struct ng_cisco_ipaddr */ 148 static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[] 149 = NG_CISCO_IPADDR_TYPE_INFO; 150 static const struct ng_parse_type ng_cisco_ipaddr_type = { 151 &ng_parse_struct_type, 152 &ng_cisco_ipaddr_type_fields 153 }; 154 155 /* List of commands and how to convert arguments to/from ASCII */ 156 static const struct ng_cmdlist ng_iface_cmds[] = { 157 { 158 NGM_IFACE_COOKIE, 159 NGM_IFACE_GET_IFNAME, 160 "getifname", 161 NULL, 162 &ng_parse_string_type 163 }, 164 { 165 NGM_IFACE_COOKIE, 166 NGM_IFACE_POINT2POINT, 167 "point2point", 168 NULL, 169 NULL 170 }, 171 { 172 NGM_IFACE_COOKIE, 173 NGM_IFACE_BROADCAST, 174 "broadcast", 175 NULL, 176 NULL 177 }, 178 { 179 NGM_CISCO_COOKIE, 180 NGM_CISCO_GET_IPADDR, 181 "getipaddr", 182 NULL, 183 &ng_cisco_ipaddr_type 184 }, 185 { 186 NGM_IFACE_COOKIE, 187 NGM_IFACE_GET_IFINDEX, 188 "getifindex", 189 NULL, 190 &ng_parse_uint32_type 191 }, 192 { 0 } 193 }; 194 195 /* Node type descriptor */ 196 static struct ng_type typestruct = { 197 .version = NG_ABI_VERSION, 198 .name = NG_IFACE_NODE_TYPE, 199 .mod_event = ng_iface_mod_event, 200 .constructor = ng_iface_constructor, 201 .rcvmsg = ng_iface_rcvmsg, 202 .shutdown = ng_iface_shutdown, 203 .newhook = ng_iface_newhook, 204 .rcvdata = ng_iface_rcvdata, 205 .disconnect = ng_iface_disconnect, 206 .cmdlist = ng_iface_cmds, 207 }; 208 NETGRAPH_INIT(iface, &typestruct); 209 210 /* We keep a bitmap indicating which unit numbers are free. 211 One means the unit number is free, zero means it's taken. */ 212 static int *ng_iface_units = NULL; 213 static int ng_iface_units_len = 0; 214 215 #define UNITS_BITSPERWORD (sizeof(*ng_iface_units) * NBBY) 216 217 218 /************************************************************************ 219 HELPER STUFF 220 ************************************************************************/ 221 222 /* 223 * Get the family descriptor from the family ID 224 */ 225 static __inline iffam_p 226 get_iffam_from_af(sa_family_t family) 227 { 228 iffam_p iffam; 229 int k; 230 231 for (k = 0; k < NUM_FAMILIES; k++) { 232 iffam = &gFamilies[k]; 233 if (iffam->family == family) 234 return (iffam); 235 } 236 return (NULL); 237 } 238 239 /* 240 * Get the family descriptor from the hook 241 */ 242 static __inline iffam_p 243 get_iffam_from_hook(priv_p priv, hook_p hook) 244 { 245 int k; 246 247 for (k = 0; k < NUM_FAMILIES; k++) 248 if (priv->hooks[k] == hook) 249 return (&gFamilies[k]); 250 return (NULL); 251 } 252 253 /* 254 * Get the hook from the iffam descriptor 255 */ 256 257 static __inline hook_p * 258 get_hook_from_iffam(priv_p priv, iffam_p iffam) 259 { 260 return (&priv->hooks[iffam - gFamilies]); 261 } 262 263 /* 264 * Get the iffam descriptor from the name 265 */ 266 static __inline iffam_p 267 get_iffam_from_name(const char *name) 268 { 269 iffam_p iffam; 270 int k; 271 272 for (k = 0; k < NUM_FAMILIES; k++) { 273 iffam = &gFamilies[k]; 274 if (!strcmp(iffam->hookname, name)) 275 return (iffam); 276 } 277 return (NULL); 278 } 279 280 /* 281 * Find the first free unit number for a new interface. 282 * Increase the size of the unit bitmap as necessary. 283 */ 284 static __inline__ int 285 ng_iface_get_unit(int *unit) 286 { 287 int index, bit; 288 289 for (index = 0; index < ng_iface_units_len 290 && ng_iface_units[index] == 0; index++); 291 if (index == ng_iface_units_len) { /* extend array */ 292 int i, *newarray, newlen; 293 294 newlen = (2 * ng_iface_units_len) + 4; 295 newarray = kmalloc(newlen * sizeof(*ng_iface_units), 296 M_NETGRAPH_IFACE, M_NOWAIT); 297 if (newarray == NULL) 298 return (ENOMEM); 299 bcopy(ng_iface_units, newarray, 300 ng_iface_units_len * sizeof(*ng_iface_units)); 301 for (i = ng_iface_units_len; i < newlen; i++) 302 newarray[i] = ~0; 303 if (ng_iface_units != NULL) 304 kfree(ng_iface_units, M_NETGRAPH_IFACE); 305 ng_iface_units = newarray; 306 ng_iface_units_len = newlen; 307 } 308 bit = ffs(ng_iface_units[index]) - 1; 309 KASSERT(bit >= 0 && bit <= UNITS_BITSPERWORD - 1, 310 ("%s: word=%d bit=%d", __func__, ng_iface_units[index], bit)); 311 ng_iface_units[index] &= ~(1 << bit); 312 *unit = (index * UNITS_BITSPERWORD) + bit; 313 return (0); 314 } 315 316 /* 317 * Free a no longer needed unit number. 318 */ 319 static __inline__ void 320 ng_iface_free_unit(int unit) 321 { 322 int index, bit; 323 324 index = unit / UNITS_BITSPERWORD; 325 bit = unit % UNITS_BITSPERWORD; 326 KASSERT(index < ng_iface_units_len, 327 ("%s: unit=%d len=%d", __func__, unit, ng_iface_units_len)); 328 KASSERT((ng_iface_units[index] & (1 << bit)) == 0, 329 ("%s: unit=%d is free", __func__, unit)); 330 ng_iface_units[index] |= (1 << bit); 331 /* 332 * XXX We could think about reducing the size of ng_iface_units[] 333 * XXX here if the last portion is all ones 334 */ 335 } 336 337 /************************************************************************ 338 INTERFACE STUFF 339 ************************************************************************/ 340 341 /* 342 * Process an ioctl for the virtual interface 343 */ 344 static int 345 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data, 346 struct ucred *cr) 347 { 348 struct ifreq *const ifr = (struct ifreq *) data; 349 int error = 0; 350 351 #ifdef DEBUG 352 ng_iface_print_ioctl(ifp, command, data); 353 #endif 354 crit_enter(); 355 switch (command) { 356 357 /* These two are mostly handled at a higher layer */ 358 case SIOCSIFADDR: 359 ifp->if_flags |= IFF_UP; 360 ifp->if_flags |= IFF_RUNNING; 361 ifq_clr_oactive(&ifp->if_snd); 362 break; 363 case SIOCGIFADDR: 364 break; 365 366 /* Set flags */ 367 case SIOCSIFFLAGS: 368 /* 369 * If the interface is marked up and stopped, then start it. 370 * If it is marked down and running, then stop it. 371 */ 372 if (ifr->ifr_flags & IFF_UP) { 373 if (!(ifp->if_flags & IFF_RUNNING)) { 374 ifq_clr_oactive(&ifp->if_snd); 375 ifp->if_flags |= IFF_RUNNING; 376 } 377 } else { 378 if (ifp->if_flags & IFF_RUNNING) { 379 ifp->if_flags &= ~IFF_RUNNING; 380 ifq_clr_oactive(&ifp->if_snd); 381 } 382 } 383 break; 384 385 /* Set the interface MTU */ 386 case SIOCSIFMTU: 387 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX 388 || ifr->ifr_mtu < NG_IFACE_MTU_MIN) 389 error = EINVAL; 390 else 391 ifp->if_mtu = ifr->ifr_mtu; 392 break; 393 394 /* Stuff that's not supported */ 395 case SIOCADDMULTI: 396 case SIOCDELMULTI: 397 error = 0; 398 break; 399 case SIOCSIFPHYS: 400 error = EOPNOTSUPP; 401 break; 402 403 default: 404 error = EINVAL; 405 break; 406 } 407 crit_exit(); 408 return (error); 409 } 410 411 /* 412 * This routine is called to deliver a packet out the interface. 413 * We simply look at the address family and relay the packet to 414 * the corresponding hook, if it exists and is connected. 415 */ 416 417 static int 418 ng_iface_output(struct ifnet *ifp, struct mbuf *m, 419 struct sockaddr *dst, struct rtentry *rt0) 420 { 421 uint32_t af; 422 int error; 423 424 /* Check interface flags */ 425 if (!((ifp->if_flags & IFF_UP) && (ifp->if_flags & IFF_RUNNING))) { 426 m_freem(m); 427 return (ENETDOWN); 428 } 429 430 /* BPF writes need to be handled specially. */ 431 if (dst->sa_family == AF_UNSPEC) { 432 bcopy(dst->sa_data, &af, sizeof(af)); 433 dst->sa_family = af; 434 } 435 436 /* Berkeley packet filter */ 437 ng_iface_bpftap(ifp, m, dst->sa_family); 438 439 if (ifq_is_enabled(&ifp->if_snd)) { 440 M_PREPEND(m, sizeof(sa_family_t), MB_DONTWAIT); 441 if (m == NULL) { 442 IFNET_STAT_INC(ifp, oerrors, 1); 443 return (ENOBUFS); 444 } 445 *(sa_family_t *)m->m_data = dst->sa_family; 446 error = ifq_dispatch(ifp, m, NULL); 447 } else 448 error = ng_iface_send(ifp, m, dst->sa_family); 449 450 return (error); 451 } 452 453 /* 454 * Start method is used only when ALTQ is enabled. 455 */ 456 static void 457 ng_iface_start(struct ifnet *ifp, struct ifaltq_subque *ifsq) 458 { 459 struct mbuf *m = NULL; 460 sa_family_t sa; 461 462 KASSERT(ifq_is_enabled(&ifp->if_snd), ("%s without ALTQ", __func__)); 463 464 for(;;) { 465 m = ifq_dequeue(&ifp->if_snd, m); 466 if (m == NULL) 467 break; 468 sa = *mtod(m, sa_family_t *); 469 m_adj(m, sizeof(sa_family_t)); 470 ng_iface_send(ifp, m, sa); 471 } 472 } 473 474 /* 475 * Flash a packet by the BPF (requires prepending 4 byte AF header) 476 * Note the phoney mbuf; this is OK because BPF treats it read-only. 477 */ 478 static void 479 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family) 480 { 481 int32_t family4 = (int32_t)family; 482 483 KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__)); 484 485 if (ifp->if_bpf) { 486 bpf_gettoken(); 487 if (ifp->if_bpf) 488 bpf_ptap(ifp->if_bpf, m, &family4, sizeof(family4)); 489 bpf_reltoken(); 490 } 491 } 492 493 /* 494 * This routine does actual delivery of the packet into the 495 * netgraph(4). It is called from ng_iface_start() and 496 * ng_iface_output(). 497 */ 498 static int 499 ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa) 500 { 501 const priv_p priv = (priv_p) ifp->if_softc; 502 const iffam_p iffam = get_iffam_from_af(sa); 503 int error; 504 int len; 505 506 /* Check address family to determine hook (if known) */ 507 if (iffam == NULL) { 508 m_freem(m); 509 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa); 510 return (EAFNOSUPPORT); 511 } 512 513 /* Copy length before the mbuf gets invalidated. */ 514 len = m->m_pkthdr.len; 515 516 /* Send packet. If hook is not connected, 517 mbuf will get freed. */ 518 NG_SEND_DATA_ONLY(error, *get_hook_from_iffam(priv, iffam), m); 519 520 /* Update stats. */ 521 if (error == 0) { 522 IFNET_STAT_INC(ifp, obytes, len); 523 IFNET_STAT_INC(ifp, opackets, 1); 524 } 525 526 return (error); 527 } 528 529 #ifdef DEBUG 530 /* 531 * Display an ioctl to the virtual interface 532 */ 533 534 static void 535 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data) 536 { 537 char *str; 538 539 switch (command & IOC_DIRMASK) { 540 case IOC_VOID: 541 str = "IO"; 542 break; 543 case IOC_OUT: 544 str = "IOR"; 545 break; 546 case IOC_IN: 547 str = "IOW"; 548 break; 549 case IOC_INOUT: 550 str = "IORW"; 551 break; 552 default: 553 str = "IO??"; 554 } 555 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n", 556 ifp->if_xname, 557 str, 558 IOCGROUP(command), 559 command & 0xff, 560 IOCPARM_LEN(command)); 561 } 562 #endif /* DEBUG */ 563 564 /************************************************************************ 565 NETGRAPH NODE STUFF 566 ************************************************************************/ 567 568 /* 569 * Constructor for a node 570 */ 571 static int 572 ng_iface_constructor(node_p node) 573 { 574 struct ifnet *ifp; 575 priv_p priv; 576 int error; 577 578 /* Allocate node and interface private structures */ 579 priv = kmalloc(sizeof(*priv), M_NETGRAPH_IFACE, 580 M_WAITOK | M_NULLOK | M_ZERO); 581 if (priv == NULL) 582 return (ENOMEM); 583 ifp = kmalloc(sizeof(*ifp), M_NETGRAPH_IFACE, M_WAITOK | M_NULLOK | M_ZERO); 584 if (ifp == NULL) { 585 kfree(priv, M_NETGRAPH_IFACE); 586 return (ENOMEM); 587 } 588 589 /* Link them together */ 590 ifp->if_softc = priv; 591 priv->ifp = ifp; 592 593 /* Get an interface unit number */ 594 if ((error = ng_iface_get_unit(&priv->unit)) != 0) { 595 kfree(ifp, M_NETGRAPH_IFACE); 596 kfree(priv, M_NETGRAPH_IFACE); 597 return (error); 598 } 599 600 601 /* Link together node and private info */ 602 NG_NODE_SET_PRIVATE(node, priv); 603 priv->node = node; 604 605 /* Initialize interface structure */ 606 if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit); 607 ifp->if_output = ng_iface_output; 608 ifp->if_start = ng_iface_start; 609 ifp->if_ioctl = ng_iface_ioctl; 610 ifp->if_watchdog = NULL; 611 ifp->if_mtu = NG_IFACE_MTU_DEFAULT; 612 ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST); 613 ifp->if_type = IFT_PROPVIRTUAL; /* XXX */ 614 ifp->if_addrlen = 0; /* XXX */ 615 ifp->if_hdrlen = 0; /* XXX */ 616 ifp->if_baudrate = 64000; /* XXX */ 617 ifq_set_maxlen(&ifp->if_snd, IFQ_MAXLEN); 618 ifq_set_ready(&ifp->if_snd); 619 620 /* Give this node the same name as the interface (if possible) */ 621 if (ng_name_node(node, ifp->if_xname) != 0) 622 log(LOG_WARNING, "%s: can't acquire netgraph name\n", 623 ifp->if_xname); 624 625 /* Attach the interface */ 626 if_attach(ifp, NULL); 627 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t)); 628 629 /* Done */ 630 return (0); 631 } 632 633 /* 634 * Give our ok for a hook to be added 635 */ 636 static int 637 ng_iface_newhook(node_p node, hook_p hook, const char *name) 638 { 639 const iffam_p iffam = get_iffam_from_name(name); 640 hook_p *hookptr; 641 642 if (iffam == NULL) 643 return (EPFNOSUPPORT); 644 hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam); 645 if (*hookptr != NULL) 646 return (EISCONN); 647 *hookptr = hook; 648 NG_HOOK_HI_STACK(hook); 649 return (0); 650 } 651 652 /* 653 * Receive a control message 654 */ 655 static int 656 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook) 657 { 658 const priv_p priv = NG_NODE_PRIVATE(node); 659 struct ifnet *const ifp = priv->ifp; 660 struct ng_mesg *resp = NULL; 661 int error = 0; 662 struct ng_mesg *msg; 663 664 NGI_GET_MSG(item, msg); 665 switch (msg->header.typecookie) { 666 case NGM_IFACE_COOKIE: 667 switch (msg->header.cmd) { 668 case NGM_IFACE_GET_IFNAME: 669 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_WAITOK | M_NULLOK); 670 if (resp == NULL) { 671 error = ENOMEM; 672 break; 673 } 674 strlcpy(resp->data, ifp->if_xname, IFNAMSIZ); 675 break; 676 677 case NGM_IFACE_POINT2POINT: 678 case NGM_IFACE_BROADCAST: 679 { 680 681 /* Deny request if interface is UP */ 682 if ((ifp->if_flags & IFF_UP) != 0) 683 return (EBUSY); 684 685 /* Change flags */ 686 switch (msg->header.cmd) { 687 case NGM_IFACE_POINT2POINT: 688 ifp->if_flags |= IFF_POINTOPOINT; 689 ifp->if_flags &= ~IFF_BROADCAST; 690 break; 691 case NGM_IFACE_BROADCAST: 692 ifp->if_flags &= ~IFF_POINTOPOINT; 693 ifp->if_flags |= IFF_BROADCAST; 694 break; 695 } 696 break; 697 } 698 699 case NGM_IFACE_GET_IFINDEX: 700 NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_WAITOK | M_NULLOK); 701 if (resp == NULL) { 702 error = ENOMEM; 703 break; 704 } 705 *((uint32_t *)resp->data) = priv->ifp->if_index; 706 break; 707 708 default: 709 error = EINVAL; 710 break; 711 } 712 break; 713 case NGM_CISCO_COOKIE: 714 switch (msg->header.cmd) { 715 case NGM_CISCO_GET_IPADDR: /* we understand this too */ 716 { 717 struct ifaddr_container *ifac; 718 719 /* Return the first configured IP address */ 720 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 721 struct ifaddr *ifa = ifac->ifa; 722 struct ng_cisco_ipaddr *ips; 723 724 if (ifa->ifa_addr->sa_family != AF_INET) 725 continue; 726 NG_MKRESPONSE(resp, msg, sizeof(ips), M_WAITOK | M_NULLOK); 727 if (resp == NULL) { 728 error = ENOMEM; 729 break; 730 } 731 ips = (struct ng_cisco_ipaddr *)resp->data; 732 ips->ipaddr = ((struct sockaddr_in *) 733 ifa->ifa_addr)->sin_addr; 734 ips->netmask = ((struct sockaddr_in *) 735 ifa->ifa_netmask)->sin_addr; 736 break; 737 } 738 739 /* No IP addresses on this interface? */ 740 if (ifac == NULL) 741 error = EADDRNOTAVAIL; 742 break; 743 } 744 default: 745 error = EINVAL; 746 break; 747 } 748 break; 749 case NGM_FLOW_COOKIE: 750 switch (msg->header.cmd) { 751 case NGM_LINK_IS_UP: 752 ifp->if_flags |= IFF_RUNNING; 753 break; 754 case NGM_LINK_IS_DOWN: 755 ifp->if_flags &= ~IFF_RUNNING; 756 break; 757 default: 758 break; 759 } 760 break; 761 default: 762 error = EINVAL; 763 break; 764 } 765 NG_RESPOND_MSG(error, node, item, resp); 766 NG_FREE_MSG(msg); 767 return (error); 768 } 769 770 /* 771 * Recive data from a hook. Pass the packet to the correct input routine. 772 */ 773 static int 774 ng_iface_rcvdata(hook_p hook, item_p item) 775 { 776 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 777 const iffam_p iffam = get_iffam_from_hook(priv, hook); 778 struct ifnet *const ifp = priv->ifp; 779 struct mbuf *m; 780 int isr; 781 782 NGI_GET_M(item, m); 783 NG_FREE_ITEM(item); 784 /* Sanity checks */ 785 KASSERT(iffam != NULL, ("%s: iffam", __func__)); 786 M_ASSERTPKTHDR(m); 787 if ((ifp->if_flags & IFF_UP) == 0) { 788 NG_FREE_M(m); 789 return (ENETDOWN); 790 } 791 792 /* Update interface stats */ 793 IFNET_STAT_INC(ifp, ipackets, 1); 794 IFNET_STAT_INC(ifp, ibytes, m->m_pkthdr.len); 795 796 /* Note receiving interface */ 797 m->m_pkthdr.rcvif = ifp; 798 799 /* Berkeley packet filter */ 800 ng_iface_bpftap(ifp, m, iffam->family); 801 802 /* Send packet */ 803 switch (iffam->family) { 804 #ifdef INET 805 case AF_INET: 806 isr = NETISR_IP; 807 break; 808 #endif 809 #ifdef INET6 810 case AF_INET6: 811 isr = NETISR_IPV6; 812 break; 813 #endif 814 #ifdef IPX 815 case AF_IPX: 816 isr = NETISR_IPX; 817 break; 818 #endif 819 default: 820 m_freem(m); 821 return (EAFNOSUPPORT); 822 } 823 #if 0 824 /* First chunk of an mbuf contains good junk */ 825 if (harvest.point_to_point) 826 random_harvest(m, 16, 3, 0, RANDOM_NET); 827 #endif 828 netisr_queue(isr, m); 829 return (0); 830 } 831 832 /* 833 * Shutdown and remove the node and its associated interface. 834 */ 835 static int 836 ng_iface_shutdown(node_p node) 837 { 838 const priv_p priv = NG_NODE_PRIVATE(node); 839 840 bpfdetach(priv->ifp); 841 if_detach(priv->ifp); 842 kfree(priv->ifp, M_NETGRAPH_IFACE); 843 priv->ifp = NULL; 844 ng_iface_free_unit(priv->unit); 845 kfree(priv, M_NETGRAPH_IFACE); 846 NG_NODE_SET_PRIVATE(node, NULL); 847 NG_NODE_UNREF(node); 848 return (0); 849 } 850 851 /* 852 * Hook disconnection. Note that we do *not* shutdown when all 853 * hooks have been disconnected. 854 */ 855 static int 856 ng_iface_disconnect(hook_p hook) 857 { 858 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 859 const iffam_p iffam = get_iffam_from_hook(priv, hook); 860 861 if (iffam == NULL) 862 panic(__func__); 863 *get_hook_from_iffam(priv, iffam) = NULL; 864 return (0); 865 } 866 867 /* 868 * Handle loading and unloading for this node type. 869 */ 870 static int 871 ng_iface_mod_event(module_t mod, int event, void *data) 872 { 873 int error = 0; 874 875 switch (event) { 876 case MOD_LOAD: 877 break; 878 case MOD_UNLOAD: 879 break; 880 default: 881 error = EOPNOTSUPP; 882 break; 883 } 884 return (error); 885 } 886