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sys/netgraph/ng_fec.c
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1 /* 2 * ng_fec.c 3 */ 4 5 /*- 6 * Copyright (c) 2001 Berkeley Software Design, Inc. 7 * Copyright (c) 2000, 2001 8 * Bill Paul <wpaul@osd.bsdi.com>. All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by Bill Paul. 21 * 4. Neither the name of the author nor the names of any co-contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL Bill Paul OR THE VOICES IN HIS HEAD 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 35 * THE POSSIBILITY OF SUCH DAMAGE. 36 * 37 * $FreeBSD: releng/6.1/sys/netgraph/ng_fec.c 152512 2005-11-16 10:13:34Z ru $ 38 */ 39 /*- 40 * Copyright (c) 1996-1999 Whistle Communications, Inc. 41 * All rights reserved. 42 * 43 * Subject to the following obligations and disclaimer of warranty, use and 44 * redistribution of this software, in source or object code forms, with or 45 * without modifications are expressly permitted by Whistle Communications; 46 * provided, however, that: 47 * 1. Any and all reproductions of the source or object code must include the 48 * copyright notice above and the following disclaimer of warranties; and 49 * 2. No rights are granted, in any manner or form, to use Whistle 50 * Communications, Inc. trademarks, including the mark "WHISTLE 51 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 52 * such appears in the above copyright notice or in the software. 53 * 54 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 55 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 56 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 57 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 58 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 59 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 60 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 61 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 62 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 63 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 64 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 65 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 66 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 67 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 68 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 69 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 70 * OF SUCH DAMAGE. 71 * 72 * Author: Archie Cobbs <archie@freebsd.org> 73 * 74 * $Whistle: ng_fec.c,v 1.33 1999/11/01 09:24:51 julian Exp $ 75 */ 76 77 /* 78 * This module implements ethernet channel bonding using the Cisco 79 * Fast EtherChannel mechanism. Two or four ports may be combined 80 * into a single aggregate interface. 81 * 82 * Interfaces are named fec0, fec1, etc. New nodes take the 83 * first available interface name. 84 * 85 * This node also includes Berkeley packet filter support. 86 * 87 * Note that this node doesn't need to connect to any other 88 * netgraph nodes in order to do its work. 89 */ 90 91 #include <sys/param.h> 92 #include <sys/systm.h> 93 #include <sys/errno.h> 94 #include <sys/kernel.h> 95 #include <sys/malloc.h> 96 #include <sys/mbuf.h> 97 #include <sys/errno.h> 98 #include <sys/sockio.h> 99 #include <sys/socket.h> 100 #include <sys/syslog.h> 101 #include <sys/libkern.h> 102 #include <sys/queue.h> 103 104 #include <net/if.h> 105 #include <net/if_types.h> 106 #include <net/if_arp.h> 107 #include <net/if_media.h> 108 #include <net/bpf.h> 109 #include <net/ethernet.h> 110 111 #include "opt_inet.h" 112 #include "opt_inet6.h" 113 114 #include <netinet/in.h> 115 #ifdef INET 116 #include <netinet/in_systm.h> 117 #include <netinet/ip.h> 118 #endif 119 120 #ifdef INET6 121 #include <netinet/ip6.h> 122 #endif 123 124 #include <netgraph/ng_message.h> 125 #include <netgraph/netgraph.h> 126 #include <netgraph/ng_parse.h> 127 #include <netgraph/ng_fec.h> 128 129 /* 130 * We need a way to stash a pointer to our netgraph node in the 131 * ifnet structure so that receive handling works. As far as I can 132 * tell, although there is an AF_NETGRAPH address family, it's only 133 * used to identify sockaddr_ng structures: there is no netgraph address 134 * family domain. This means the AF_NETGRAPH entry in ifp->if_afdata 135 * should be unused, so we can use to hold our node context. 136 */ 137 #define IFP2NG(ifp) ((ifp)->if_afdata[AF_NETGRAPH]) 138 139 /* 140 * Current fast etherchannel implementations use either 2 or 4 141 * ports, so for now we limit the maximum bundle size to 4 interfaces. 142 */ 143 #define FEC_BUNDLESIZ 4 144 145 struct ng_fec_portlist { 146 struct ifnet *fec_if; 147 void (*fec_if_input) (struct ifnet *, 148 struct mbuf *); 149 int fec_idx; 150 int fec_ifstat; 151 struct ether_addr fec_mac; 152 TAILQ_ENTRY(ng_fec_portlist) fec_list; 153 }; 154 155 struct ng_fec_bundle { 156 TAILQ_HEAD(,ng_fec_portlist) ng_fec_ports; 157 int fec_ifcnt; 158 int fec_btype; 159 int (*fec_if_output) (struct ifnet *, 160 struct mbuf *, 161 struct sockaddr *, 162 struct rtentry *); 163 }; 164 165 #define FEC_BTYPE_MAC 0x01 166 #define FEC_BTYPE_INET 0x02 167 #define FEC_BTYPE_INET6 0x03 168 169 /* Node private data */ 170 struct ng_fec_private { 171 struct ifnet *ifp; 172 struct ifmedia ifmedia; 173 int if_flags; 174 int if_error; /* XXX */ 175 int unit; /* Interface unit number */ 176 node_p node; /* Our netgraph node */ 177 struct ng_fec_bundle fec_bundle;/* Aggregate bundle */ 178 struct callout_handle fec_ch; /* callout handle for ticker */ 179 }; 180 typedef struct ng_fec_private *priv_p; 181 182 /* Interface methods */ 183 static void ng_fec_input(struct ifnet *, struct mbuf *); 184 static void ng_fec_start(struct ifnet *ifp); 185 static int ng_fec_choose_port(struct ng_fec_bundle *b, 186 struct mbuf *m, struct ifnet **ifp); 187 static int ng_fec_setport(struct ifnet *ifp, u_long cmd, caddr_t data); 188 static void ng_fec_init(void *arg); 189 static void ng_fec_stop(struct ifnet *ifp); 190 static int ng_fec_ifmedia_upd(struct ifnet *ifp); 191 static void ng_fec_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr); 192 static int ng_fec_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data); 193 static int ng_fec_output(struct ifnet *ifp, struct mbuf *m0, 194 struct sockaddr *dst, struct rtentry *rt0); 195 static void ng_fec_tick(void *arg); 196 static int ng_fec_addport(struct ng_fec_private *priv, char *iface); 197 static int ng_fec_delport(struct ng_fec_private *priv, char *iface); 198 199 #ifdef DEBUG 200 static void ng_fec_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data); 201 #endif 202 203 /* Netgraph methods */ 204 static int ng_fec_mod_event(module_t, int, void *); 205 static ng_constructor_t ng_fec_constructor; 206 static ng_rcvmsg_t ng_fec_rcvmsg; 207 static ng_shutdown_t ng_fec_shutdown; 208 209 /* List of commands and how to convert arguments to/from ASCII */ 210 static const struct ng_cmdlist ng_fec_cmds[] = { 211 { 212 NGM_FEC_COOKIE, 213 NGM_FEC_ADD_IFACE, 214 "add_iface", 215 &ng_parse_string_type, 216 NULL, 217 }, 218 { 219 NGM_FEC_COOKIE, 220 NGM_FEC_DEL_IFACE, 221 "del_iface", 222 &ng_parse_string_type, 223 NULL, 224 }, 225 { 226 NGM_FEC_COOKIE, 227 NGM_FEC_SET_MODE_MAC, 228 "set_mode_mac", 229 NULL, 230 NULL, 231 }, 232 { 233 NGM_FEC_COOKIE, 234 NGM_FEC_SET_MODE_INET, 235 "set_mode_inet", 236 NULL, 237 NULL, 238 }, 239 { 0 } 240 }; 241 242 /* Node type descriptor */ 243 static struct ng_type typestruct = { 244 .version = NG_ABI_VERSION, 245 .name = NG_FEC_NODE_TYPE, 246 .mod_event = ng_fec_mod_event, 247 .constructor = ng_fec_constructor, 248 .rcvmsg = ng_fec_rcvmsg, 249 .shutdown = ng_fec_shutdown, 250 .cmdlist = ng_fec_cmds, 251 }; 252 NETGRAPH_INIT(fec, &typestruct); 253 254 /* We keep a bitmap indicating which unit numbers are free. 255 One means the unit number is free, zero means it's taken. */ 256 static int *ng_fec_units = NULL; 257 static int ng_fec_units_len = 0; 258 static int ng_units_in_use = 0; 259 260 #define UNITS_BITSPERWORD (sizeof(*ng_fec_units) * NBBY) 261 262 static struct mtx ng_fec_mtx; 263 264 /* 265 * Find the first free unit number for a new interface. 266 * Increase the size of the unit bitmap as necessary. 267 */ 268 static __inline int 269 ng_fec_get_unit(int *unit) 270 { 271 int index, bit; 272 273 mtx_lock(&ng_fec_mtx); 274 for (index = 0; index < ng_fec_units_len 275 && ng_fec_units[index] == 0; index++); 276 if (index == ng_fec_units_len) { /* extend array */ 277 int i, *newarray, newlen; 278 279 newlen = (2 * ng_fec_units_len) + 4; 280 MALLOC(newarray, int *, newlen * sizeof(*ng_fec_units), 281 M_NETGRAPH, M_NOWAIT); 282 if (newarray == NULL) { 283 mtx_unlock(&ng_fec_mtx); 284 return (ENOMEM); 285 } 286 bcopy(ng_fec_units, newarray, 287 ng_fec_units_len * sizeof(*ng_fec_units)); 288 for (i = ng_fec_units_len; i < newlen; i++) 289 newarray[i] = ~0; 290 if (ng_fec_units != NULL) 291 FREE(ng_fec_units, M_NETGRAPH); 292 ng_fec_units = newarray; 293 ng_fec_units_len = newlen; 294 } 295 bit = ffs(ng_fec_units[index]) - 1; 296 KASSERT(bit >= 0 && bit <= UNITS_BITSPERWORD - 1, 297 ("%s: word=%d bit=%d", __FUNCTION__, ng_fec_units[index], bit)); 298 ng_fec_units[index] &= ~(1 << bit); 299 *unit = (index * UNITS_BITSPERWORD) + bit; 300 ng_units_in_use++; 301 mtx_unlock(&ng_fec_mtx); 302 return (0); 303 } 304 305 /* 306 * Free a no longer needed unit number. 307 */ 308 static __inline void 309 ng_fec_free_unit(int unit) 310 { 311 int index, bit; 312 313 index = unit / UNITS_BITSPERWORD; 314 bit = unit % UNITS_BITSPERWORD; 315 mtx_lock(&ng_fec_mtx); 316 KASSERT(index < ng_fec_units_len, 317 ("%s: unit=%d len=%d", __FUNCTION__, unit, ng_fec_units_len)); 318 KASSERT((ng_fec_units[index] & (1 << bit)) == 0, 319 ("%s: unit=%d is free", __FUNCTION__, unit)); 320 ng_fec_units[index] |= (1 << bit); 321 /* 322 * XXX We could think about reducing the size of ng_fec_units[] 323 * XXX here if the last portion is all ones 324 * XXX At least free it if no more units 325 * Needed if we are to eventually be able to unload. 326 */ 327 ng_units_in_use--; 328 if (ng_units_in_use == 0) { /* XXX make SMP safe */ 329 FREE(ng_fec_units, M_NETGRAPH); 330 ng_fec_units_len = 0; 331 ng_fec_units = NULL; 332 } 333 mtx_unlock(&ng_fec_mtx); 334 } 335 336 /************************************************************************ 337 INTERFACE STUFF 338 ************************************************************************/ 339 340 static int 341 ng_fec_addport(struct ng_fec_private *priv, char *iface) 342 { 343 struct ng_fec_bundle *b; 344 struct ifnet *ifp, *bifp; 345 struct ng_fec_portlist *p, *new; 346 347 if (priv == NULL || iface == NULL) 348 return(EINVAL); 349 350 b = &priv->fec_bundle; 351 ifp = priv->ifp; 352 353 /* Only allow reconfiguration if not running. */ 354 if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 355 printf("fec%d: can't add new iface; bundle is running\n", 356 priv->unit); 357 return (EINVAL); 358 } 359 360 /* Find the interface */ 361 bifp = ifunit(iface); 362 if (bifp == NULL) { 363 printf("fec%d: tried to add iface %s, which " 364 "doesn't seem to exist\n", priv->unit, iface); 365 return(ENOENT); 366 } 367 368 /* See if we have room in the bundle */ 369 if (b->fec_ifcnt == FEC_BUNDLESIZ) { 370 printf("fec%d: can't add new iface; bundle is full\n", 371 priv->unit); 372 return(ENOSPC); 373 } 374 375 /* See if the interface is already in the bundle */ 376 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) { 377 if (p->fec_if == bifp) { 378 printf("fec%d: iface %s is already in this " 379 "bundle\n", priv->unit, iface); 380 return(EINVAL); 381 } 382 } 383 384 /* 385 * All interfaces must use the same output vector. Once the 386 * user attaches an interface of one type, make all subsequent 387 * interfaces have the same output vector. 388 */ 389 if (b->fec_if_output != NULL) { 390 if (b->fec_if_output != bifp->if_output) { 391 printf("fec%d: iface %s is not the same type " 392 "as the other interface(s) already in " 393 "the bundle\n", priv->unit, iface); 394 return(EINVAL); 395 } 396 } 397 398 /* Allocate new list entry. */ 399 MALLOC(new, struct ng_fec_portlist *, 400 sizeof(struct ng_fec_portlist), M_NETGRAPH, M_NOWAIT); 401 if (new == NULL) 402 return(ENOMEM); 403 404 IF_AFDATA_LOCK(bifp); 405 IFP2NG(bifp) = priv->node; 406 IF_AFDATA_UNLOCK(bifp); 407 408 /* 409 * If this is the first interface added to the bundle, 410 * use its MAC address for the virtual interface (and, 411 * by extension, all the other ports in the bundle). 412 */ 413 if (b->fec_ifcnt == 0) 414 if_setlladdr(ifp, IFP2ENADDR(bifp), ETHER_ADDR_LEN); 415 416 b->fec_btype = FEC_BTYPE_MAC; 417 new->fec_idx = b->fec_ifcnt; 418 b->fec_ifcnt++; 419 420 /* Save the real MAC address. */ 421 bcopy(IFP2ENADDR(bifp), 422 (char *)&new->fec_mac, ETHER_ADDR_LEN); 423 424 /* Set up phony MAC address. */ 425 if_setlladdr(bifp, IFP2ENADDR(ifp), ETHER_ADDR_LEN); 426 427 /* Save original input vector */ 428 new->fec_if_input = bifp->if_input; 429 430 /* Override it with our own */ 431 bifp->if_input = ng_fec_input; 432 433 /* Save output vector too. */ 434 if (b->fec_if_output == NULL) 435 b->fec_if_output = bifp->if_output; 436 437 /* Add to the queue */ 438 new->fec_if = bifp; 439 new->fec_ifstat = -1; 440 TAILQ_INSERT_TAIL(&b->ng_fec_ports, new, fec_list); 441 442 return(0); 443 } 444 445 static int 446 ng_fec_delport(struct ng_fec_private *priv, char *iface) 447 { 448 struct ng_fec_bundle *b; 449 struct ifnet *ifp, *bifp; 450 struct ng_fec_portlist *p; 451 452 if (priv == NULL || iface == NULL) 453 return(EINVAL); 454 455 b = &priv->fec_bundle; 456 ifp = priv->ifp; 457 458 /* Only allow reconfiguration if not running. */ 459 if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 460 printf("fec%d: can't remove iface; bundle is running\n", 461 priv->unit); 462 return (EINVAL); 463 } 464 465 /* Find the interface */ 466 bifp = ifunit(iface); 467 if (bifp == NULL) { 468 printf("fec%d: tried to remove iface %s, which " 469 "doesn't seem to exist\n", priv->unit, iface); 470 return(ENOENT); 471 } 472 473 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) { 474 if (p->fec_if == bifp) 475 break; 476 } 477 478 if (p == NULL) { 479 printf("fec%d: tried to remove iface %s which " 480 "is not in our bundle\n", priv->unit, iface); 481 return(EINVAL); 482 } 483 484 /* Stop interface */ 485 bifp->if_flags &= ~IFF_UP; 486 (*bifp->if_ioctl)(bifp, SIOCSIFFLAGS, NULL); 487 488 /* Restore MAC address. */ 489 if_setlladdr(bifp, (u_char *)&p->fec_mac, ETHER_ADDR_LEN); 490 491 /* Restore input vector */ 492 bifp->if_input = p->fec_if_input; 493 494 /* Remove our node context pointer. */ 495 IF_AFDATA_LOCK(bifp); 496 IFP2NG(bifp) = NULL; 497 IF_AFDATA_UNLOCK(bifp); 498 499 /* Delete port */ 500 TAILQ_REMOVE(&b->ng_fec_ports, p, fec_list); 501 FREE(p, M_NETGRAPH); 502 b->fec_ifcnt--; 503 504 if (b->fec_ifcnt == 0) 505 b->fec_if_output = NULL; 506 507 return(0); 508 } 509 510 /* 511 * Pass an ioctl command down to all the underyling interfaces in a 512 * bundle. Used for setting multicast filters and flags. 513 */ 514 515 static int 516 ng_fec_setport(struct ifnet *ifp, u_long command, caddr_t data) 517 { 518 struct ng_fec_private *priv; 519 struct ng_fec_bundle *b; 520 struct ifnet *oifp; 521 struct ng_fec_portlist *p; 522 523 priv = ifp->if_softc; 524 b = &priv->fec_bundle; 525 526 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) { 527 oifp = p->fec_if; 528 if (oifp != NULL) 529 (*oifp->if_ioctl)(oifp, command, data); 530 } 531 532 return(0); 533 } 534 535 static void 536 ng_fec_init(void *arg) 537 { 538 struct ng_fec_private *priv; 539 struct ng_fec_bundle *b; 540 struct ifnet *ifp, *bifp; 541 struct ng_fec_portlist *p; 542 543 priv = arg; 544 ifp = priv->ifp; 545 b = &priv->fec_bundle; 546 547 if (b->fec_ifcnt != 2 && b->fec_ifcnt != FEC_BUNDLESIZ) { 548 printf("fec%d: invalid bundle " 549 "size: %d\n", priv->unit, 550 b->fec_ifcnt); 551 return; 552 } 553 554 ng_fec_stop(ifp); 555 556 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) { 557 bifp = p->fec_if; 558 bifp->if_flags |= IFF_UP; 559 (*bifp->if_ioctl)(bifp, SIOCSIFFLAGS, NULL); 560 /* mark iface as up and let the monitor check it */ 561 p->fec_ifstat = -1; 562 } 563 564 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE); 565 ifp->if_drv_flags |= IFF_DRV_RUNNING; 566 567 priv->fec_ch = timeout(ng_fec_tick, priv, hz); 568 569 return; 570 } 571 572 static void 573 ng_fec_stop(struct ifnet *ifp) 574 { 575 struct ng_fec_private *priv; 576 struct ng_fec_bundle *b; 577 struct ifnet *bifp; 578 struct ng_fec_portlist *p; 579 580 priv = ifp->if_softc; 581 b = &priv->fec_bundle; 582 583 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) { 584 bifp = p->fec_if; 585 bifp->if_flags &= ~IFF_UP; 586 (*bifp->if_ioctl)(bifp, SIOCSIFFLAGS, NULL); 587 } 588 589 untimeout(ng_fec_tick, priv, priv->fec_ch); 590 591 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE); 592 593 return; 594 } 595 596 static void 597 ng_fec_tick(void *arg) 598 { 599 struct ng_fec_private *priv; 600 struct ng_fec_bundle *b; 601 struct ifmediareq ifmr; 602 struct ifnet *ifp; 603 struct ng_fec_portlist *p; 604 int error = 0; 605 606 priv = arg; 607 b = &priv->fec_bundle; 608 609 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) { 610 bzero((char *)&ifmr, sizeof(ifmr)); 611 ifp = p->fec_if; 612 error = (*ifp->if_ioctl)(ifp, SIOCGIFMEDIA, (caddr_t)&ifmr); 613 if (error) { 614 printf("fec%d: failed to check status " 615 "of link %s\n", priv->unit, ifp->if_xname); 616 continue; 617 } 618 619 if (ifmr.ifm_status & IFM_AVALID) { 620 if (ifmr.ifm_status & IFM_ACTIVE) { 621 if (p->fec_ifstat == -1 || 622 p->fec_ifstat == 0) { 623 p->fec_ifstat = 1; 624 printf("fec%d: port %s in bundle " 625 "is up\n", priv->unit, 626 ifp->if_xname); 627 } 628 } else { 629 if (p->fec_ifstat == -1 || 630 p->fec_ifstat == 1) { 631 p->fec_ifstat = 0; 632 printf("fec%d: port %s in bundle " 633 "is down\n", priv->unit, 634 ifp->if_xname); 635 } 636 } 637 } 638 } 639 640 ifp = priv->ifp; 641 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 642 priv->fec_ch = timeout(ng_fec_tick, priv, hz); 643 644 return; 645 } 646 647 static int 648 ng_fec_ifmedia_upd(struct ifnet *ifp) 649 { 650 return(0); 651 } 652 653 static void ng_fec_ifmedia_sts(struct ifnet *ifp, 654 struct ifmediareq *ifmr) 655 { 656 struct ng_fec_private *priv; 657 struct ng_fec_bundle *b; 658 struct ng_fec_portlist *p; 659 660 priv = ifp->if_softc; 661 b = &priv->fec_bundle; 662 663 ifmr->ifm_status = IFM_AVALID; 664 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) { 665 if (p->fec_ifstat == 1) { 666 ifmr->ifm_status |= IFM_ACTIVE; 667 break; 668 } 669 } 670 671 return; 672 } 673 674 /* 675 * Process an ioctl for the virtual interface 676 */ 677 static int 678 ng_fec_ioctl(struct ifnet *ifp, u_long command, caddr_t data) 679 { 680 struct ifreq *const ifr = (struct ifreq *) data; 681 int s, error = 0; 682 struct ng_fec_private *priv; 683 struct ng_fec_bundle *b; 684 685 priv = ifp->if_softc; 686 b = &priv->fec_bundle; 687 688 #ifdef DEBUG 689 ng_fec_print_ioctl(ifp, command, data); 690 #endif 691 s = splimp(); 692 switch (command) { 693 694 /* These two are mostly handled at a higher layer */ 695 case SIOCSIFADDR: 696 case SIOCGIFADDR: 697 case SIOCSIFMTU: 698 error = ether_ioctl(ifp, command, data); 699 break; 700 701 /* Set flags */ 702 case SIOCSIFFLAGS: 703 /* 704 * If the interface is marked up and stopped, then start it. 705 * If it is marked down and running, then stop it. 706 */ 707 if (ifr->ifr_flags & IFF_UP) { 708 if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 709 /* Sanity. */ 710 if (b->fec_ifcnt != 2 && 711 b->fec_ifcnt != FEC_BUNDLESIZ) { 712 printf("fec%d: invalid bundle " 713 "size: %d\n", priv->unit, 714 b->fec_ifcnt); 715 error = EINVAL; 716 break; 717 } 718 ng_fec_init(priv); 719 } 720 /* 721 * Bubble down changes in promisc mode to 722 * underlying interfaces. 723 */ 724 if ((ifp->if_flags & IFF_PROMISC) != 725 (priv->if_flags & IFF_PROMISC)) { 726 ng_fec_setport(ifp, command, data); 727 priv->if_flags = ifp->if_flags; 728 } 729 } else { 730 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 731 ng_fec_stop(ifp); 732 } 733 break; 734 735 case SIOCADDMULTI: 736 case SIOCDELMULTI: 737 ng_fec_setport(ifp, command, data); 738 error = 0; 739 break; 740 case SIOCGIFMEDIA: 741 case SIOCSIFMEDIA: 742 error = ifmedia_ioctl(ifp, ifr, &priv->ifmedia, command); 743 break; 744 /* Stuff that's not supported */ 745 case SIOCSIFPHYS: 746 error = EOPNOTSUPP; 747 break; 748 749 default: 750 error = EINVAL; 751 break; 752 } 753 (void) splx(s); 754 return (error); 755 } 756 757 /* 758 * This routine spies on mbufs received by underlying network device 759 * drivers. When we add an interface to our bundle, we override its 760 * if_input routine with a pointer to ng_fec_input(). This means we 761 * get to look at all the device's packets before sending them to the 762 * real ether_input() for processing by the stack. Once we verify the 763 * packet comes from an interface that's been aggregated into 764 * our bundle, we fix up the rcvif pointer and increment our 765 * packet counters so that it looks like the frames are actually 766 * coming from us. 767 */ 768 static void 769 ng_fec_input(struct ifnet *ifp, struct mbuf *m0) 770 { 771 struct ng_node *node; 772 struct ng_fec_private *priv; 773 struct ng_fec_bundle *b; 774 struct ifnet *bifp; 775 struct ng_fec_portlist *p; 776 777 /* Sanity check */ 778 if (ifp == NULL || m0 == NULL) 779 return; 780 781 node = IFP2NG(ifp); 782 783 /* Sanity check part II */ 784 if (node == NULL) 785 return; 786 787 priv = NG_NODE_PRIVATE(node); 788 b = &priv->fec_bundle; 789 bifp = priv->ifp; 790 791 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) { 792 if (p->fec_if == m0->m_pkthdr.rcvif) 793 break; 794 } 795 796 /* Wasn't meant for us; leave this frame alone. */ 797 if (p == NULL) 798 return; 799 800 /* 801 * Check for a BPF tap on the underlying interface. This 802 * is mainly a debugging aid: it allows tcpdump-ing of an 803 * individual interface in a bundle to work, which it 804 * otherwise would not. BPF tapping of our own aggregate 805 * interface will occur once we call ether_input(). 806 */ 807 BPF_MTAP(m0->m_pkthdr.rcvif, m0); 808 809 /* Convince the system that this is our frame. */ 810 m0->m_pkthdr.rcvif = bifp; 811 bifp->if_ipackets++; 812 bifp->if_ibytes += m0->m_pkthdr.len + sizeof(struct ether_header); 813 814 (*bifp->if_input)(bifp, m0); 815 816 return; 817 } 818 819 /* 820 * Take a quick peek at the packet and see if it's ok for us to use 821 * the inet or inet6 hash methods on it, if they're enabled. We do 822 * this by setting flags in the mbuf header. Once we've made up our 823 * mind what to do, we pass the frame to output vector for further 824 * processing. 825 */ 826 827 static int 828 ng_fec_output(struct ifnet *ifp, struct mbuf *m, 829 struct sockaddr *dst, struct rtentry *rt0) 830 { 831 const priv_p priv = (priv_p) ifp->if_softc; 832 struct ng_fec_bundle *b; 833 int error; 834 835 /* Check interface flags */ 836 if (!((ifp->if_flags & IFF_UP) && 837 (ifp->if_drv_flags & IFF_DRV_RUNNING))) { 838 m_freem(m); 839 return (ENETDOWN); 840 } 841 842 b = &priv->fec_bundle; 843 844 switch (b->fec_btype) { 845 case FEC_BTYPE_MAC: 846 m->m_flags |= M_FEC_MAC; 847 break; 848 #ifdef INET 849 case FEC_BTYPE_INET: 850 /* 851 * We can't use the INET address port selection 852 * scheme if this isn't an INET packet. 853 */ 854 if (dst->sa_family == AF_INET) 855 m->m_flags |= M_FEC_INET; 856 #ifdef INET6 857 else if (dst->sa_family == AF_INET6) 858 m->m_flags |= M_FEC_INET6; 859 #endif 860 else { 861 #ifdef DEBUG 862 if_printf(ifp, "can't do inet aggregation of non " 863 "inet packet\n"); 864 #endif 865 m->m_flags |= M_FEC_MAC; 866 } 867 break; 868 #endif 869 default: 870 if_printf(ifp, "bogus hash type: %d\n", 871 b->fec_btype); 872 m_freem(m); 873 return(EINVAL); 874 break; 875 } 876 877 /* 878 * Pass the frame to the output vector for all the protocol 879 * handling. This will put the ethernet header on the packet 880 * for us. 881 */ 882 priv->if_error = 0; 883 error = (*b->fec_if_output)(ifp, m, dst, rt0); 884 if (priv->if_error && !error) 885 error = priv->if_error; 886 887 return(error); 888 } 889 890 /* 891 * Apply a hash to the source and destination addresses in the packet 892 * in order to select an interface. Also check link status and handle 893 * dead links accordingly. 894 */ 895 896 static int 897 ng_fec_choose_port(struct ng_fec_bundle *b, 898 struct mbuf *m, struct ifnet **ifp) 899 { 900 struct ether_header *eh; 901 struct mbuf *m0; 902 #ifdef INET 903 struct ip *ip; 904 #ifdef INET6 905 struct ip6_hdr *ip6; 906 #endif 907 #endif 908 909 struct ng_fec_portlist *p; 910 int port = 0, mask; 911 912 /* 913 * If there are only two ports, mask off all but the 914 * last bit for XORing. If there are 4, mask off all 915 * but the last 2 bits. 916 */ 917 mask = b->fec_ifcnt == 2 ? 0x1 : 0x3; 918 eh = mtod(m, struct ether_header *); 919 #ifdef INET 920 ip = (struct ip *)(mtod(m, char *) + 921 sizeof(struct ether_header)); 922 #ifdef INET6 923 ip6 = (struct ip6_hdr *)(mtod(m, char *) + 924 sizeof(struct ether_header)); 925 #endif 926 #endif 927 928 /* 929 * The fg_fec_output() routine is supposed to leave a 930 * flag for us in the mbuf that tells us what hash to 931 * use, but sometimes a new mbuf is prepended to the 932 * chain, so we have to search every mbuf in the chain 933 * to find the flags. 934 */ 935 m0 = m; 936 while (m0) { 937 if (m0->m_flags & (M_FEC_MAC|M_FEC_INET|M_FEC_INET6)) 938 break; 939 m0 = m0->m_next; 940 } 941 if (m0 == NULL) 942 return(EINVAL); 943 944 switch (m0->m_flags & (M_FEC_MAC|M_FEC_INET|M_FEC_INET6)) { 945 case M_FEC_MAC: 946 port = (eh->ether_dhost[5] ^ 947 eh->ether_shost[5]) & mask; 948 break; 949 #ifdef INET 950 case M_FEC_INET: 951 port = (ntohl(ip->ip_dst.s_addr) ^ 952 ntohl(ip->ip_src.s_addr)) & mask; 953 break; 954 #ifdef INET6 955 case M_FEC_INET6: 956 port = (ip6->ip6_dst.s6_addr[15] ^ 957 ip6->ip6_dst.s6_addr[15]) & mask; 958 break; 959 #endif 960 #endif 961 default: 962 return(EINVAL); 963 break; 964 } 965 966 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) { 967 if (port == p->fec_idx) 968 break; 969 } 970 971 /* 972 * Now that we've chosen a port, make sure it's 973 * alive. If it's not alive, cycle through the bundle 974 * looking for a port that is alive. If we don't find 975 * any, return an error. 976 */ 977 if (p->fec_ifstat != 1) { 978 struct ng_fec_portlist *n = NULL; 979 980 n = TAILQ_NEXT(p, fec_list); 981 if (n == NULL) 982 n = TAILQ_FIRST(&b->ng_fec_ports); 983 while (n != p) { 984 if (n->fec_ifstat == 1) 985 break; 986 n = TAILQ_NEXT(n, fec_list); 987 if (n == NULL) 988 n = TAILQ_FIRST(&b->ng_fec_ports); 989 } 990 if (n == p) 991 return(EAGAIN); 992 p = n; 993 } 994 995 *ifp = p->fec_if; 996 997 return(0); 998 } 999 1000 /* 1001 * Now that the packet has been run through ether_output(), yank it 1002 * off our own send queue and stick it on the queue for the appropriate 1003 * underlying physical interface. Note that if the interface's send 1004 * queue is full, we save an error status in our private netgraph 1005 * space which will eventually be handed up to ng_fec_output(), which 1006 * will return it to the rest of the IP stack. We need to do this 1007 * in order to duplicate the effect of ether_output() returning ENOBUFS 1008 * when it detects that an interface's send queue is full. There's no 1009 * other way to signal the error status from here since the if_start() 1010 * routine is spec'ed to return void. 1011 * 1012 * Once the frame is queued, we call ether_output_frame() to initiate 1013 * transmission. 1014 */ 1015 static void 1016 ng_fec_start(struct ifnet *ifp) 1017 { 1018 struct ng_fec_private *priv; 1019 struct ng_fec_bundle *b; 1020 struct ifnet *oifp = NULL; 1021 struct mbuf *m0; 1022 int error; 1023 1024 priv = ifp->if_softc; 1025 b = &priv->fec_bundle; 1026 1027 IF_DEQUEUE(&ifp->if_snd, m0); 1028 if (m0 == NULL) 1029 return; 1030 1031 BPF_MTAP(ifp, m0); 1032 1033 /* Queue up packet on the proper port. */ 1034 error = ng_fec_choose_port(b, m0, &oifp); 1035 if (error) { 1036 ifp->if_ierrors++; 1037 m_freem(m0); 1038 priv->if_error = ENOBUFS; 1039 return; 1040 } 1041 ifp->if_opackets++; 1042 1043 priv->if_error = IF_HANDOFF(&oifp->if_snd, m0, oifp) ? 0 : ENOBUFS; 1044 1045 return; 1046 } 1047 1048 #ifdef DEBUG 1049 /* 1050 * Display an ioctl to the virtual interface 1051 */ 1052 1053 static void 1054 ng_fec_print_ioctl(struct ifnet *ifp, int command, caddr_t data) 1055 { 1056 char *str; 1057 1058 switch (command & IOC_DIRMASK) { 1059 case IOC_VOID: 1060 str = "IO"; 1061 break; 1062 case IOC_OUT: 1063 str = "IOR"; 1064 break; 1065 case IOC_IN: 1066 str = "IOW"; 1067 break; 1068 case IOC_INOUT: 1069 str = "IORW"; 1070 break; 1071 default: 1072 str = "IO??"; 1073 } 1074 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n", 1075 ifp->if_xname, 1076 str, 1077 IOCGROUP(command), 1078 command & 0xff, 1079 IOCPARM_LEN(command)); 1080 } 1081 #endif /* DEBUG */ 1082 1083 /************************************************************************ 1084 NETGRAPH NODE STUFF 1085 ************************************************************************/ 1086 1087 /* 1088 * Constructor for a node 1089 */ 1090 static int 1091 ng_fec_constructor(node_p node) 1092 { 1093 char ifname[NG_FEC_FEC_NAME_MAX + 1]; 1094 struct ifnet *ifp; 1095 priv_p priv; 1096 struct ng_fec_bundle *b; 1097 int error = 0; 1098 1099 /* Allocate node and interface private structures */ 1100 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO); 1101 if (priv == NULL) 1102 return (ENOMEM); 1103 1104 ifp = priv->ifp = if_alloc(IFT_ETHER); 1105 if (ifp == NULL) { 1106 FREE(priv, M_NETGRAPH); 1107 return (ENOSPC); 1108 } 1109 b = &priv->fec_bundle; 1110 1111 /* Link them together */ 1112 ifp->if_softc = priv; 1113 1114 /* Get an interface unit number */ 1115 if ((error = ng_fec_get_unit(&priv->unit)) != 0) { 1116 if_free(ifp); 1117 FREE(priv, M_NETGRAPH); 1118 return (error); 1119 } 1120 1121 /* Link together node and private info */ 1122 NG_NODE_SET_PRIVATE(node, priv); 1123 priv->node = node; 1124 1125 /* Initialize interface structure */ 1126 if_initname(ifp, NG_FEC_FEC_NAME, priv->unit); 1127 ifp->if_start = ng_fec_start; 1128 ifp->if_ioctl = ng_fec_ioctl; 1129 ifp->if_init = ng_fec_init; 1130 ifp->if_watchdog = NULL; 1131 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN; 1132 ifp->if_mtu = NG_FEC_MTU_DEFAULT; 1133 ifp->if_flags = (IFF_SIMPLEX|IFF_BROADCAST|IFF_MULTICAST); 1134 ifp->if_addrlen = 0; /* XXX */ 1135 ifp->if_hdrlen = 0; /* XXX */ 1136 ifp->if_baudrate = 100000000; /* XXX */ 1137 TAILQ_INIT(&ifp->if_addrhead); /* XXX useless - done in if_attach */ 1138 1139 /* Give this node the same name as the interface (if possible) */ 1140 bzero(ifname, sizeof(ifname)); 1141 strlcpy(ifname, ifp->if_xname, sizeof(ifname)); 1142 if (ng_name_node(node, ifname) != 0) 1143 log(LOG_WARNING, "%s: can't acquire netgraph name\n", ifname); 1144 1145 /* Attach the interface */ 1146 ether_ifattach(ifp, IFP2ENADDR(priv->ifp)); 1147 callout_handle_init(&priv->fec_ch); 1148 1149 /* Override output method with our own */ 1150 ifp->if_output = ng_fec_output; 1151 1152 TAILQ_INIT(&b->ng_fec_ports); 1153 b->fec_ifcnt = 0; 1154 1155 ifmedia_init(&priv->ifmedia, 0, 1156 ng_fec_ifmedia_upd, ng_fec_ifmedia_sts); 1157 ifmedia_add(&priv->ifmedia, IFM_ETHER|IFM_NONE, 0, NULL); 1158 ifmedia_set(&priv->ifmedia, IFM_ETHER|IFM_NONE); 1159 1160 /* Done */ 1161 return (0); 1162 } 1163 1164 /* 1165 * Receive a control message 1166 */ 1167 static int 1168 ng_fec_rcvmsg(node_p node, item_p item, hook_p lasthook) 1169 { 1170 const priv_p priv = NG_NODE_PRIVATE(node); 1171 struct ng_fec_bundle *b; 1172 struct ng_mesg *resp = NULL; 1173 struct ng_mesg *msg; 1174 char *ifname; 1175 int error = 0; 1176 1177 NGI_GET_MSG(item, msg); 1178 b = &priv->fec_bundle; 1179 1180 switch (msg->header.typecookie) { 1181 case NGM_FEC_COOKIE: 1182 switch (msg->header.cmd) { 1183 case NGM_FEC_ADD_IFACE: 1184 ifname = msg->data; 1185 error = ng_fec_addport(priv, ifname); 1186 break; 1187 case NGM_FEC_DEL_IFACE: 1188 ifname = msg->data; 1189 error = ng_fec_delport(priv, ifname); 1190 break; 1191 case NGM_FEC_SET_MODE_MAC: 1192 b->fec_btype = FEC_BTYPE_MAC; 1193 break; 1194 #ifdef INET 1195 case NGM_FEC_SET_MODE_INET: 1196 b->fec_btype = FEC_BTYPE_INET; 1197 break; 1198 #ifdef INET6 1199 case NGM_FEC_SET_MODE_INET6: 1200 b->fec_btype = FEC_BTYPE_INET6; 1201 break; 1202 #endif 1203 #endif 1204 default: 1205 error = EINVAL; 1206 break; 1207 } 1208 break; 1209 default: 1210 error = EINVAL; 1211 break; 1212 } 1213 NG_RESPOND_MSG(error, node, item, resp); 1214 NG_FREE_MSG(msg); 1215 return (error); 1216 } 1217 1218 /* 1219 * Shutdown and remove the node and its associated interface. 1220 */ 1221 static int 1222 ng_fec_shutdown(node_p node) 1223 { 1224 const priv_p priv = NG_NODE_PRIVATE(node); 1225 struct ng_fec_bundle *b; 1226 struct ng_fec_portlist *p; 1227 1228 b = &priv->fec_bundle; 1229 ng_fec_stop(priv->ifp); 1230 1231 while (!TAILQ_EMPTY(&b->ng_fec_ports)) { 1232 p = TAILQ_FIRST(&b->ng_fec_ports); 1233 ng_fec_delport(priv, p->fec_if->if_xname); 1234 } 1235 1236 ether_ifdetach(priv->ifp); 1237 if_free_type(priv->ifp, IFT_ETHER); 1238 ifmedia_removeall(&priv->ifmedia); 1239 ng_fec_free_unit(priv->unit); 1240 FREE(priv, M_NETGRAPH); 1241 NG_NODE_SET_PRIVATE(node, NULL); 1242 NG_NODE_UNREF(node); 1243 return (0); 1244 } 1245 1246 /* 1247 * Handle loading and unloading for this node type. 1248 */ 1249 static int 1250 ng_fec_mod_event(module_t mod, int event, void *data) 1251 { 1252 int error = 0; 1253 1254 switch (event) { 1255 case MOD_LOAD: 1256 mtx_init(&ng_fec_mtx, "ng_fec", NULL, MTX_DEF); 1257 break; 1258 case MOD_UNLOAD: 1259 mtx_destroy(&ng_fec_mtx); 1260 break; 1261 default: 1262 error = EOPNOTSUPP; 1263 break; 1264 } 1265 return (error); 1266 }
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