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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/6.0/sys/netgraph/ng_fec.c 149582 2005-08-29 16:23:21Z emax $ 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_dl.h> 108 #include <net/if_media.h> 109 #include <net/bpf.h> 110 #include <net/ethernet.h> 111 112 #include "opt_inet.h" 113 #include "opt_inet6.h" 114 115 #include <netinet/in.h> 116 #ifdef INET 117 #include <netinet/in_systm.h> 118 #include <netinet/ip.h> 119 #endif 120 121 #ifdef INET6 122 #include <netinet/ip6.h> 123 #endif 124 125 #include <netgraph/ng_message.h> 126 #include <netgraph/netgraph.h> 127 #include <netgraph/ng_parse.h> 128 #include <netgraph/ng_fec.h> 129 130 /* 131 * We need a way to stash a pointer to our netgraph node in the 132 * ifnet structure so that receive handling works. As far as I can 133 * tell, although there is an AF_NETGRAPH address family, it's only 134 * used to identify sockaddr_ng structures: there is no netgraph address 135 * family domain. This means the AF_NETGRAPH entry in ifp->if_afdata 136 * should be unused, so we can use to hold our node context. 137 */ 138 #define IFP2NG(ifp) (struct ng_node *)(ifp->if_afdata[AF_NETGRAPH]) 139 #define IFP2NG_SET(ifp, val) ifp->if_afdata[AF_NETGRAPH] = (val); 140 #define FEC_INC(x, y) (x) = (x + 1) % y 141 142 /* 143 * Current fast etherchannel implementations use either 2 or 4 144 * ports, so for now we limit the maximum bundle size to 4 interfaces. 145 */ 146 #define FEC_BUNDLESIZ 4 147 148 struct ng_fec_portlist { 149 struct ifnet *fec_if; 150 void (*fec_if_input) (struct ifnet *, 151 struct mbuf *); 152 int fec_idx; 153 int fec_ifstat; 154 struct ether_addr fec_mac; 155 TAILQ_ENTRY(ng_fec_portlist) fec_list; 156 }; 157 158 struct ng_fec_bundle { 159 TAILQ_HEAD(,ng_fec_portlist) ng_fec_ports; 160 int fec_ifcnt; 161 int fec_btype; 162 int (*fec_if_output) (struct ifnet *, 163 struct mbuf *, 164 struct sockaddr *, 165 struct rtentry *); 166 }; 167 168 #define FEC_BTYPE_MAC 0x01 169 #define FEC_BTYPE_INET 0x02 170 #define FEC_BTYPE_INET6 0x03 171 172 /* Node private data */ 173 struct ng_fec_private { 174 struct ifnet *ifp; 175 struct ifmedia ifmedia; 176 int if_flags; 177 int if_error; /* XXX */ 178 int unit; /* Interface unit number */ 179 node_p node; /* Our netgraph node */ 180 struct ng_fec_bundle fec_bundle;/* Aggregate bundle */ 181 struct callout_handle fec_ch; /* callout handle for ticker */ 182 }; 183 typedef struct ng_fec_private *priv_p; 184 185 /* Interface methods */ 186 static void ng_fec_input(struct ifnet *, struct mbuf *); 187 static void ng_fec_start(struct ifnet *ifp); 188 static int ng_fec_choose_port(struct ng_fec_bundle *b, 189 struct mbuf *m, struct ifnet **ifp); 190 static int ng_fec_setport(struct ifnet *ifp, u_long cmd, caddr_t data); 191 static void ng_fec_init(void *arg); 192 static void ng_fec_stop(struct ifnet *ifp); 193 static int ng_fec_ifmedia_upd(struct ifnet *ifp); 194 static void ng_fec_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr); 195 static int ng_fec_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data); 196 static int ng_fec_output(struct ifnet *ifp, struct mbuf *m0, 197 struct sockaddr *dst, struct rtentry *rt0); 198 static void ng_fec_tick(void *arg); 199 static int ng_fec_addport(struct ng_fec_private *priv, char *iface); 200 static int ng_fec_delport(struct ng_fec_private *priv, char *iface); 201 202 #ifdef DEBUG 203 static void ng_fec_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data); 204 #endif 205 206 /* Netgraph methods */ 207 static int ng_fec_mod_event(module_t, int, void *); 208 static ng_constructor_t ng_fec_constructor; 209 static ng_rcvmsg_t ng_fec_rcvmsg; 210 static ng_shutdown_t ng_fec_shutdown; 211 212 /* List of commands and how to convert arguments to/from ASCII */ 213 static const struct ng_cmdlist ng_fec_cmds[] = { 214 { 215 NGM_FEC_COOKIE, 216 NGM_FEC_ADD_IFACE, 217 "add_iface", 218 &ng_parse_string_type, 219 NULL, 220 }, 221 { 222 NGM_FEC_COOKIE, 223 NGM_FEC_DEL_IFACE, 224 "del_iface", 225 &ng_parse_string_type, 226 NULL, 227 }, 228 { 229 NGM_FEC_COOKIE, 230 NGM_FEC_SET_MODE_MAC, 231 "set_mode_mac", 232 NULL, 233 NULL, 234 }, 235 { 236 NGM_FEC_COOKIE, 237 NGM_FEC_SET_MODE_INET, 238 "set_mode_inet", 239 NULL, 240 NULL, 241 }, 242 { 0 } 243 }; 244 245 /* Node type descriptor */ 246 static struct ng_type typestruct = { 247 .version = NG_ABI_VERSION, 248 .name = NG_FEC_NODE_TYPE, 249 .mod_event = ng_fec_mod_event, 250 .constructor = ng_fec_constructor, 251 .rcvmsg = ng_fec_rcvmsg, 252 .shutdown = ng_fec_shutdown, 253 .cmdlist = ng_fec_cmds, 254 }; 255 NETGRAPH_INIT(fec, &typestruct); 256 257 /* We keep a bitmap indicating which unit numbers are free. 258 One means the unit number is free, zero means it's taken. */ 259 static int *ng_fec_units = NULL; 260 static int ng_fec_units_len = 0; 261 static int ng_units_in_use = 0; 262 263 #define UNITS_BITSPERWORD (sizeof(*ng_fec_units) * NBBY) 264 265 static struct mtx ng_fec_mtx; 266 267 /* 268 * Find the first free unit number for a new interface. 269 * Increase the size of the unit bitmap as necessary. 270 */ 271 static __inline int 272 ng_fec_get_unit(int *unit) 273 { 274 int index, bit; 275 276 mtx_lock(&ng_fec_mtx); 277 for (index = 0; index < ng_fec_units_len 278 && ng_fec_units[index] == 0; index++); 279 if (index == ng_fec_units_len) { /* extend array */ 280 int i, *newarray, newlen; 281 282 newlen = (2 * ng_fec_units_len) + 4; 283 MALLOC(newarray, int *, newlen * sizeof(*ng_fec_units), 284 M_NETGRAPH, M_NOWAIT); 285 if (newarray == NULL) { 286 mtx_unlock(&ng_fec_mtx); 287 return (ENOMEM); 288 } 289 bcopy(ng_fec_units, newarray, 290 ng_fec_units_len * sizeof(*ng_fec_units)); 291 for (i = ng_fec_units_len; i < newlen; i++) 292 newarray[i] = ~0; 293 if (ng_fec_units != NULL) 294 FREE(ng_fec_units, M_NETGRAPH); 295 ng_fec_units = newarray; 296 ng_fec_units_len = newlen; 297 } 298 bit = ffs(ng_fec_units[index]) - 1; 299 KASSERT(bit >= 0 && bit <= UNITS_BITSPERWORD - 1, 300 ("%s: word=%d bit=%d", __FUNCTION__, ng_fec_units[index], bit)); 301 ng_fec_units[index] &= ~(1 << bit); 302 *unit = (index * UNITS_BITSPERWORD) + bit; 303 ng_units_in_use++; 304 mtx_unlock(&ng_fec_mtx); 305 return (0); 306 } 307 308 /* 309 * Free a no longer needed unit number. 310 */ 311 static __inline void 312 ng_fec_free_unit(int unit) 313 { 314 int index, bit; 315 316 index = unit / UNITS_BITSPERWORD; 317 bit = unit % UNITS_BITSPERWORD; 318 mtx_lock(&ng_fec_mtx); 319 KASSERT(index < ng_fec_units_len, 320 ("%s: unit=%d len=%d", __FUNCTION__, unit, ng_fec_units_len)); 321 KASSERT((ng_fec_units[index] & (1 << bit)) == 0, 322 ("%s: unit=%d is free", __FUNCTION__, unit)); 323 ng_fec_units[index] |= (1 << bit); 324 /* 325 * XXX We could think about reducing the size of ng_fec_units[] 326 * XXX here if the last portion is all ones 327 * XXX At least free it if no more units 328 * Needed if we are to eventually be able to unload. 329 */ 330 ng_units_in_use--; 331 if (ng_units_in_use == 0) { /* XXX make SMP safe */ 332 FREE(ng_fec_units, M_NETGRAPH); 333 ng_fec_units_len = 0; 334 ng_fec_units = NULL; 335 } 336 mtx_unlock(&ng_fec_mtx); 337 } 338 339 /************************************************************************ 340 INTERFACE STUFF 341 ************************************************************************/ 342 343 static int 344 ng_fec_addport(struct ng_fec_private *priv, char *iface) 345 { 346 struct ng_fec_bundle *b; 347 struct ifnet *ifp, *bifp; 348 struct ifaddr *ifa; 349 struct sockaddr_dl *sdl; 350 struct ng_fec_portlist *p, *new; 351 352 if (priv == NULL || iface == NULL) 353 return(EINVAL); 354 355 b = &priv->fec_bundle; 356 ifp = priv->ifp; 357 358 /* Find the interface */ 359 bifp = ifunit(iface); 360 if (bifp == NULL) { 361 printf("fec%d: tried to add iface %s, which " 362 "doesn't seem to exist\n", priv->unit, iface); 363 return(ENOENT); 364 } 365 366 /* See if we have room in the bundle */ 367 if (b->fec_ifcnt == FEC_BUNDLESIZ) { 368 printf("fec%d: can't add new iface; bundle is full\n", 369 priv->unit); 370 return(ENOSPC); 371 } 372 373 /* See if the interface is already in the bundle */ 374 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) { 375 if (p->fec_if == bifp) { 376 printf("fec%d: iface %s is already in this " 377 "bundle\n", priv->unit, iface); 378 return(EINVAL); 379 } 380 } 381 382 /* 383 * All interfaces must use the same output vector. Once the 384 * user attaches an interface of one type, make all subsequent 385 * interfaces have the same output vector. 386 */ 387 if (b->fec_if_output != NULL) { 388 if (b->fec_if_output != bifp->if_output) { 389 printf("fec%d: iface %s is not the same type " 390 "as the other interface(s) already in " 391 "the bundle\n", priv->unit, iface); 392 return(EINVAL); 393 } 394 } 395 396 /* Allocate new list entry. */ 397 MALLOC(new, struct ng_fec_portlist *, 398 sizeof(struct ng_fec_portlist), M_NETGRAPH, M_NOWAIT); 399 if (new == NULL) 400 return(ENOMEM); 401 402 IF_AFDATA_LOCK(bifp); 403 bifp->if_afdata[AF_NETGRAPH] = priv->node; 404 IF_AFDATA_UNLOCK(bifp); 405 406 /* 407 * If this is the first interface added to the bundle, 408 * use its MAC address for the virtual interface (and, 409 * by extension, all the other ports in the bundle). 410 */ 411 if (b->fec_ifcnt == 0) { 412 ifa = ifaddr_byindex(ifp->if_index); 413 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 414 bcopy(IFP2ENADDR(bifp), 415 IFP2ENADDR(priv->ifp), ETHER_ADDR_LEN); 416 bcopy(IFP2ENADDR(bifp), 417 LLADDR(sdl), ETHER_ADDR_LEN); 418 } 419 420 b->fec_btype = FEC_BTYPE_MAC; 421 new->fec_idx = b->fec_ifcnt; 422 b->fec_ifcnt++; 423 424 /* Save the real MAC address. */ 425 bcopy(IFP2ENADDR(bifp), 426 (char *)&new->fec_mac, ETHER_ADDR_LEN); 427 428 /* Set up phony MAC address. */ 429 ifa = ifaddr_byindex(bifp->if_index); 430 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 431 bcopy(IFP2ENADDR(priv->ifp), IFP2ENADDR(bifp), ETHER_ADDR_LEN); 432 bcopy(IFP2ENADDR(priv->ifp), LLADDR(sdl), ETHER_ADDR_LEN); 433 434 /* Save original input vector */ 435 new->fec_if_input = bifp->if_input; 436 437 /* Override it with our own */ 438 bifp->if_input = ng_fec_input; 439 440 /* Save output vector too. */ 441 if (b->fec_if_output == NULL) 442 b->fec_if_output = bifp->if_output; 443 444 /* Add to the queue */ 445 new->fec_if = bifp; 446 TAILQ_INSERT_TAIL(&b->ng_fec_ports, new, fec_list); 447 448 return(0); 449 } 450 451 static int 452 ng_fec_delport(struct ng_fec_private *priv, char *iface) 453 { 454 struct ng_fec_bundle *b; 455 struct ifnet *ifp, *bifp; 456 struct ifaddr *ifa; 457 struct sockaddr_dl *sdl; 458 struct ng_fec_portlist *p; 459 460 if (priv == NULL || iface == NULL) 461 return(EINVAL); 462 463 b = &priv->fec_bundle; 464 ifp = priv->ifp; 465 466 /* Find the interface */ 467 bifp = ifunit(iface); 468 if (bifp == NULL) { 469 printf("fec%d: tried to remove iface %s, which " 470 "doesn't seem to exist\n", priv->unit, iface); 471 return(ENOENT); 472 } 473 474 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) { 475 if (p->fec_if == bifp) 476 break; 477 } 478 479 if (p == NULL) { 480 printf("fec%d: tried to remove iface %s which " 481 "is not in our bundle\n", priv->unit, iface); 482 return(EINVAL); 483 } 484 485 /* Stop interface */ 486 bifp->if_flags &= ~IFF_UP; 487 (*bifp->if_ioctl)(bifp, SIOCSIFFLAGS, NULL); 488 489 /* Restore MAC address. */ 490 ifa = ifaddr_byindex(bifp->if_index); 491 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 492 bcopy((char *)&p->fec_mac, IFP2ENADDR(bifp), ETHER_ADDR_LEN); 493 bcopy((char *)&p->fec_mac, LLADDR(sdl), ETHER_ADDR_LEN); 494 495 /* Restore input vector */ 496 bifp->if_input = p->fec_if_input; 497 498 /* Remove our node context pointer. */ 499 IF_AFDATA_LOCK(bifp); 500 bifp->if_afdata[AF_NETGRAPH] = NULL; 501 IF_AFDATA_UNLOCK(bifp); 502 503 /* Delete port */ 504 TAILQ_REMOVE(&b->ng_fec_ports, p, fec_list); 505 FREE(p, M_NETGRAPH); 506 b->fec_ifcnt--; 507 508 if (b->fec_ifcnt == 0) 509 b->fec_if_output = NULL; 510 511 return(0); 512 } 513 514 /* 515 * Pass an ioctl command down to all the underyling interfaces in a 516 * bundle. Used for setting multicast filters and flags. 517 */ 518 519 static int 520 ng_fec_setport(struct ifnet *ifp, u_long command, caddr_t data) 521 { 522 struct ng_fec_private *priv; 523 struct ng_fec_bundle *b; 524 struct ifnet *oifp; 525 struct ng_fec_portlist *p; 526 527 priv = ifp->if_softc; 528 b = &priv->fec_bundle; 529 530 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) { 531 oifp = p->fec_if; 532 if (oifp != NULL) 533 (*oifp->if_ioctl)(oifp, command, data); 534 } 535 536 return(0); 537 } 538 539 static void 540 ng_fec_init(void *arg) 541 { 542 struct ng_fec_private *priv; 543 struct ng_fec_bundle *b; 544 struct ifnet *ifp, *bifp; 545 struct ng_fec_portlist *p; 546 547 priv = arg; 548 ifp = priv->ifp; 549 b = &priv->fec_bundle; 550 551 if (b->fec_ifcnt == 1 || b->fec_ifcnt == 3) { 552 printf("fec%d: invalid bundle " 553 "size: %d\n", priv->unit, 554 b->fec_ifcnt); 555 return; 556 } 557 558 ng_fec_stop(ifp); 559 560 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) { 561 bifp = p->fec_if; 562 bifp->if_flags |= IFF_UP; 563 (*bifp->if_ioctl)(bifp, SIOCSIFFLAGS, NULL); 564 /* mark iface as up and let the monitor check it */ 565 p->fec_ifstat = -1; 566 } 567 568 priv->fec_ch = timeout(ng_fec_tick, priv, hz); 569 570 return; 571 } 572 573 static void 574 ng_fec_stop(struct ifnet *ifp) 575 { 576 struct ng_fec_private *priv; 577 struct ng_fec_bundle *b; 578 struct ifnet *bifp; 579 struct ng_fec_portlist *p; 580 581 priv = ifp->if_softc; 582 b = &priv->fec_bundle; 583 584 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) { 585 bifp = p->fec_if; 586 bifp->if_flags &= ~IFF_UP; 587 (*bifp->if_ioctl)(bifp, SIOCSIFFLAGS, NULL); 588 } 589 590 untimeout(ng_fec_tick, priv, priv->fec_ch); 591 592 return; 593 } 594 595 static void 596 ng_fec_tick(void *arg) 597 { 598 struct ng_fec_private *priv; 599 struct ng_fec_bundle *b; 600 struct ifmediareq ifmr; 601 struct ifnet *ifp; 602 struct ng_fec_portlist *p; 603 int error = 0; 604 605 priv = arg; 606 b = &priv->fec_bundle; 607 608 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) { 609 bzero((char *)&ifmr, sizeof(ifmr)); 610 ifp = p->fec_if; 611 error = (*ifp->if_ioctl)(ifp, SIOCGIFMEDIA, (caddr_t)&ifmr); 612 if (error) { 613 printf("fec%d: failed to check status " 614 "of link %s\n", priv->unit, ifp->if_xname); 615 continue; 616 } 617 618 if (ifmr.ifm_status & IFM_AVALID) { 619 if (ifmr.ifm_status & IFM_ACTIVE) { 620 if (p->fec_ifstat == -1 || 621 p->fec_ifstat == 0) { 622 p->fec_ifstat = 1; 623 printf("fec%d: port %s in bundle " 624 "is up\n", priv->unit, 625 ifp->if_xname); 626 } 627 } else { 628 if (p->fec_ifstat == -1 || 629 p->fec_ifstat == 1) { 630 p->fec_ifstat = 0; 631 printf("fec%d: port %s in bundle " 632 "is down\n", priv->unit, 633 ifp->if_xname); 634 } 635 } 636 } 637 } 638 639 ifp = priv->ifp; 640 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 641 priv->fec_ch = timeout(ng_fec_tick, priv, hz); 642 643 return; 644 } 645 646 static int 647 ng_fec_ifmedia_upd(struct ifnet *ifp) 648 { 649 return(0); 650 } 651 652 static void ng_fec_ifmedia_sts(struct ifnet *ifp, 653 struct ifmediareq *ifmr) 654 { 655 struct ng_fec_private *priv; 656 struct ng_fec_bundle *b; 657 struct ng_fec_portlist *p; 658 659 priv = ifp->if_softc; 660 b = &priv->fec_bundle; 661 662 ifmr->ifm_status = IFM_AVALID; 663 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) { 664 if (p->fec_ifstat) { 665 ifmr->ifm_status |= IFM_ACTIVE; 666 break; 667 } 668 } 669 670 return; 671 } 672 673 /* 674 * Process an ioctl for the virtual interface 675 */ 676 static int 677 ng_fec_ioctl(struct ifnet *ifp, u_long command, caddr_t data) 678 { 679 struct ifreq *const ifr = (struct ifreq *) data; 680 int s, error = 0; 681 struct ng_fec_private *priv; 682 struct ng_fec_bundle *b; 683 684 priv = ifp->if_softc; 685 b = &priv->fec_bundle; 686 687 #ifdef DEBUG 688 ng_fec_print_ioctl(ifp, command, data); 689 #endif 690 s = splimp(); 691 switch (command) { 692 693 /* These two are mostly handled at a higher layer */ 694 case SIOCSIFADDR: 695 case SIOCGIFADDR: 696 case SIOCSIFMTU: 697 error = ether_ioctl(ifp, command, data); 698 break; 699 700 /* Set flags */ 701 case SIOCSIFFLAGS: 702 /* 703 * If the interface is marked up and stopped, then start it. 704 * If it is marked down and running, then stop it. 705 */ 706 if (ifr->ifr_flags & IFF_UP) { 707 if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 708 /* Sanity. */ 709 if (b->fec_ifcnt == 1 || b->fec_ifcnt == 3) { 710 printf("fec%d: invalid bundle " 711 "size: %d\n", priv->unit, 712 b->fec_ifcnt); 713 error = EINVAL; 714 break; 715 } 716 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE); 717 ifp->if_drv_flags |= IFF_DRV_RUNNING; 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 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | 732 IFF_DRV_OACTIVE); 733 ng_fec_stop(ifp); 734 } 735 break; 736 737 case SIOCADDMULTI: 738 case SIOCDELMULTI: 739 ng_fec_setport(ifp, command, data); 740 error = 0; 741 break; 742 case SIOCGIFMEDIA: 743 case SIOCSIFMEDIA: 744 error = ifmedia_ioctl(ifp, ifr, &priv->ifmedia, command); 745 break; 746 /* Stuff that's not supported */ 747 case SIOCSIFPHYS: 748 error = EOPNOTSUPP; 749 break; 750 751 default: 752 error = EINVAL; 753 break; 754 } 755 (void) splx(s); 756 return (error); 757 } 758 759 /* 760 * This routine spies on mbufs received by underlying network device 761 * drivers. When we add an interface to our bundle, we override its 762 * if_input routine with a pointer to ng_fec_input(). This means we 763 * get to look at all the device's packets before sending them to the 764 * real ether_input() for processing by the stack. Once we verify the 765 * packet comes from an interface that's been aggregated into 766 * our bundle, we fix up the rcvif pointer and increment our 767 * packet counters so that it looks like the frames are actually 768 * coming from us. 769 */ 770 static void 771 ng_fec_input(struct ifnet *ifp, struct mbuf *m0) 772 { 773 struct ng_node *node; 774 struct ng_fec_private *priv; 775 struct ng_fec_bundle *b; 776 struct ifnet *bifp; 777 struct ng_fec_portlist *p; 778 779 /* Sanity check */ 780 if (ifp == NULL || m0 == NULL) 781 return; 782 783 node = IFP2NG(ifp); 784 785 /* Sanity check part II */ 786 if (node == NULL) 787 return; 788 789 priv = NG_NODE_PRIVATE(node); 790 b = &priv->fec_bundle; 791 bifp = priv->ifp; 792 793 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) { 794 if (p->fec_if == m0->m_pkthdr.rcvif) 795 break; 796 } 797 798 /* Wasn't meant for us; leave this frame alone. */ 799 if (p == NULL) 800 return; 801 802 /* 803 * Check for a BPF tap on the underlying interface. This 804 * is mainly a debugging aid: it allows tcpdump-ing of an 805 * individual interface in a bundle to work, which it 806 * otherwise would not. BPF tapping of our own aggregate 807 * interface will occur once we call ether_input(). 808 */ 809 BPF_MTAP(m0->m_pkthdr.rcvif, m0); 810 811 /* Convince the system that this is our frame. */ 812 m0->m_pkthdr.rcvif = bifp; 813 bifp->if_ipackets++; 814 bifp->if_ibytes += m0->m_pkthdr.len + sizeof(struct ether_header); 815 816 (*bifp->if_input)(bifp, m0); 817 818 return; 819 } 820 821 /* 822 * Take a quick peek at the packet and see if it's ok for us to use 823 * the inet or inet6 hash methods on it, if they're enabled. We do 824 * this by setting flags in the mbuf header. Once we've made up our 825 * mind what to do, we pass the frame to output vector for further 826 * processing. 827 */ 828 829 static int 830 ng_fec_output(struct ifnet *ifp, struct mbuf *m, 831 struct sockaddr *dst, struct rtentry *rt0) 832 { 833 const priv_p priv = (priv_p) ifp->if_softc; 834 struct ng_fec_bundle *b; 835 int error; 836 837 /* Check interface flags */ 838 if (!((ifp->if_flags & IFF_UP) && 839 (ifp->if_drv_flags & IFF_DRV_RUNNING))) { 840 m_freem(m); 841 return (ENETDOWN); 842 } 843 844 b = &priv->fec_bundle; 845 846 switch (b->fec_btype) { 847 case FEC_BTYPE_MAC: 848 m->m_flags |= M_FEC_MAC; 849 break; 850 #ifdef INET 851 case FEC_BTYPE_INET: 852 /* 853 * We can't use the INET address port selection 854 * scheme if this isn't an INET packet. 855 */ 856 if (dst->sa_family == AF_INET) 857 m->m_flags |= M_FEC_INET; 858 #ifdef INET6 859 else if (dst->sa_family == AF_INET6) 860 m->m_flags |= M_FEC_INET6; 861 #endif 862 else { 863 #ifdef DEBUG 864 if_printf(ifp, "can't do inet aggregation of non " 865 "inet packet\n"); 866 #endif 867 m->m_flags |= M_FEC_MAC; 868 } 869 break; 870 #endif 871 default: 872 if_printf(ifp, "bogus hash type: %d\n", 873 b->fec_btype); 874 m_freem(m); 875 return(EINVAL); 876 break; 877 } 878 879 /* 880 * Pass the frame to the output vector for all the protocol 881 * handling. This will put the ethernet header on the packet 882 * for us. 883 */ 884 priv->if_error = 0; 885 error = (*b->fec_if_output)(ifp, m, dst, rt0); 886 if (priv->if_error && !error) 887 error = priv->if_error; 888 889 return(error); 890 } 891 892 /* 893 * Apply a hash to the source and destination addresses in the packet 894 * in order to select an interface. Also check link status and handle 895 * dead links accordingly. 896 */ 897 898 static int 899 ng_fec_choose_port(struct ng_fec_bundle *b, 900 struct mbuf *m, struct ifnet **ifp) 901 { 902 struct ether_header *eh; 903 struct mbuf *m0; 904 #ifdef INET 905 struct ip *ip; 906 #ifdef INET6 907 struct ip6_hdr *ip6; 908 #endif 909 #endif 910 911 struct ng_fec_portlist *p; 912 int port = 0, mask; 913 914 /* 915 * If there are only two ports, mask off all but the 916 * last bit for XORing. If there are 4, mask off all 917 * but the last 2 bits. 918 */ 919 mask = b->fec_ifcnt == 2 ? 0x1 : 0x3; 920 eh = mtod(m, struct ether_header *); 921 #ifdef INET 922 ip = (struct ip *)(mtod(m, char *) + 923 sizeof(struct ether_header)); 924 #ifdef INET6 925 ip6 = (struct ip6_hdr *)(mtod(m, char *) + 926 sizeof(struct ether_header)); 927 #endif 928 #endif 929 930 /* 931 * The fg_fec_output() routine is supposed to leave a 932 * flag for us in the mbuf that tells us what hash to 933 * use, but sometimes a new mbuf is prepended to the 934 * chain, so we have to search every mbuf in the chain 935 * to find the flags. 936 */ 937 m0 = m; 938 while (m0) { 939 if (m0->m_flags & (M_FEC_MAC|M_FEC_INET|M_FEC_INET6)) 940 break; 941 m0 = m0->m_next; 942 } 943 if (m0 == NULL) 944 return(EINVAL); 945 946 switch (m0->m_flags & (M_FEC_MAC|M_FEC_INET|M_FEC_INET6)) { 947 case M_FEC_MAC: 948 port = (eh->ether_dhost[5] ^ 949 eh->ether_shost[5]) & mask; 950 break; 951 #ifdef INET 952 case M_FEC_INET: 953 port = (ntohl(ip->ip_dst.s_addr) ^ 954 ntohl(ip->ip_src.s_addr)) & mask; 955 break; 956 #ifdef INET6 957 case M_FEC_INET6: 958 port = (ip6->ip6_dst.s6_addr[15] ^ 959 ip6->ip6_dst.s6_addr[15]) & mask; 960 break; 961 #endif 962 #endif 963 default: 964 return(EINVAL); 965 break; 966 } 967 968 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) { 969 if (port == p->fec_idx) 970 break; 971 } 972 973 /* 974 * Now that we've chosen a port, make sure it's 975 * alive. If it's not alive, cycle through the bundle 976 * looking for a port that is alive. If we don't find 977 * any, return an error. 978 */ 979 if (p->fec_ifstat != 1) { 980 struct ng_fec_portlist *n = NULL; 981 982 n = TAILQ_NEXT(p, fec_list); 983 if (n == NULL) 984 n = TAILQ_FIRST(&b->ng_fec_ports); 985 while (n != p) { 986 if (n->fec_ifstat == 1) 987 break; 988 n = TAILQ_NEXT(n, fec_list); 989 if (n == NULL) 990 n = TAILQ_FIRST(&b->ng_fec_ports); 991 } 992 if (n == p) 993 return(EAGAIN); 994 p = n; 995 } 996 997 *ifp = p->fec_if; 998 999 return(0); 1000 } 1001 1002 /* 1003 * Now that the packet has been run through ether_output(), yank it 1004 * off our own send queue and stick it on the queue for the appropriate 1005 * underlying physical interface. Note that if the interface's send 1006 * queue is full, we save an error status in our private netgraph 1007 * space which will eventually be handed up to ng_fec_output(), which 1008 * will return it to the rest of the IP stack. We need to do this 1009 * in order to duplicate the effect of ether_output() returning ENOBUFS 1010 * when it detects that an interface's send queue is full. There's no 1011 * other way to signal the error status from here since the if_start() 1012 * routine is spec'ed to return void. 1013 * 1014 * Once the frame is queued, we call ether_output_frame() to initiate 1015 * transmission. 1016 */ 1017 static void 1018 ng_fec_start(struct ifnet *ifp) 1019 { 1020 struct ng_fec_private *priv; 1021 struct ng_fec_bundle *b; 1022 struct ifnet *oifp = NULL; 1023 struct mbuf *m0; 1024 int error; 1025 1026 priv = ifp->if_softc; 1027 b = &priv->fec_bundle; 1028 1029 IF_DEQUEUE(&ifp->if_snd, m0); 1030 if (m0 == NULL) 1031 return; 1032 1033 BPF_MTAP(ifp, m0); 1034 1035 /* Queue up packet on the proper port. */ 1036 error = ng_fec_choose_port(b, m0, &oifp); 1037 if (error) { 1038 ifp->if_ierrors++; 1039 m_freem(m0); 1040 priv->if_error = ENOBUFS; 1041 return; 1042 } 1043 ifp->if_opackets++; 1044 1045 priv->if_error = IF_HANDOFF(&oifp->if_snd, m0, oifp) ? 0 : ENOBUFS; 1046 1047 return; 1048 } 1049 1050 #ifdef DEBUG 1051 /* 1052 * Display an ioctl to the virtual interface 1053 */ 1054 1055 static void 1056 ng_fec_print_ioctl(struct ifnet *ifp, int command, caddr_t data) 1057 { 1058 char *str; 1059 1060 switch (command & IOC_DIRMASK) { 1061 case IOC_VOID: 1062 str = "IO"; 1063 break; 1064 case IOC_OUT: 1065 str = "IOR"; 1066 break; 1067 case IOC_IN: 1068 str = "IOW"; 1069 break; 1070 case IOC_INOUT: 1071 str = "IORW"; 1072 break; 1073 default: 1074 str = "IO??"; 1075 } 1076 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n", 1077 ifp->if_xname, 1078 str, 1079 IOCGROUP(command), 1080 command & 0xff, 1081 IOCPARM_LEN(command)); 1082 } 1083 #endif /* DEBUG */ 1084 1085 /************************************************************************ 1086 NETGRAPH NODE STUFF 1087 ************************************************************************/ 1088 1089 /* 1090 * Constructor for a node 1091 */ 1092 static int 1093 ng_fec_constructor(node_p node) 1094 { 1095 char ifname[NG_FEC_FEC_NAME_MAX + 1]; 1096 struct ifnet *ifp; 1097 priv_p priv; 1098 struct ng_fec_bundle *b; 1099 int error = 0; 1100 1101 /* Allocate node and interface private structures */ 1102 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO); 1103 if (priv == NULL) 1104 return (ENOMEM); 1105 1106 ifp = priv->ifp = if_alloc(IFT_ETHER); 1107 if (ifp == NULL) { 1108 FREE(priv, M_NETGRAPH); 1109 return (ENOSPC); 1110 } 1111 b = &priv->fec_bundle; 1112 1113 /* Link them together */ 1114 ifp->if_softc = priv; 1115 1116 /* Get an interface unit number */ 1117 if ((error = ng_fec_get_unit(&priv->unit)) != 0) { 1118 if_free(ifp); 1119 FREE(priv, M_NETGRAPH); 1120 return (error); 1121 } 1122 1123 /* Link together node and private info */ 1124 NG_NODE_SET_PRIVATE(node, priv); 1125 priv->node = node; 1126 1127 /* Initialize interface structure */ 1128 if_initname(ifp, NG_FEC_FEC_NAME, priv->unit); 1129 ifp->if_start = ng_fec_start; 1130 ifp->if_ioctl = ng_fec_ioctl; 1131 ifp->if_init = ng_fec_init; 1132 ifp->if_watchdog = NULL; 1133 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN; 1134 ifp->if_mtu = NG_FEC_MTU_DEFAULT; 1135 ifp->if_flags = (IFF_SIMPLEX|IFF_BROADCAST|IFF_MULTICAST); 1136 ifp->if_type = IFT_PROPVIRTUAL; /* XXX */ 1137 ifp->if_addrlen = 0; /* XXX */ 1138 ifp->if_hdrlen = 0; /* XXX */ 1139 ifp->if_baudrate = 100000000; /* XXX */ 1140 TAILQ_INIT(&ifp->if_addrhead); /* XXX useless - done in if_attach */ 1141 1142 /* Give this node the same name as the interface (if possible) */ 1143 bzero(ifname, sizeof(ifname)); 1144 strlcpy(ifname, ifp->if_xname, sizeof(ifname)); 1145 if (ng_name_node(node, ifname) != 0) 1146 log(LOG_WARNING, "%s: can't acquire netgraph name\n", ifname); 1147 1148 /* Attach the interface */ 1149 ether_ifattach(ifp, IFP2ENADDR(priv->ifp)); 1150 callout_handle_init(&priv->fec_ch); 1151 1152 /* Override output method with our own */ 1153 ifp->if_output = ng_fec_output; 1154 1155 TAILQ_INIT(&b->ng_fec_ports); 1156 b->fec_ifcnt = 0; 1157 1158 ifmedia_init(&priv->ifmedia, 0, 1159 ng_fec_ifmedia_upd, ng_fec_ifmedia_sts); 1160 ifmedia_add(&priv->ifmedia, IFM_ETHER|IFM_NONE, 0, NULL); 1161 ifmedia_set(&priv->ifmedia, IFM_ETHER|IFM_NONE); 1162 1163 /* Done */ 1164 return (0); 1165 } 1166 1167 /* 1168 * Receive a control message 1169 */ 1170 static int 1171 ng_fec_rcvmsg(node_p node, item_p item, hook_p lasthook) 1172 { 1173 const priv_p priv = NG_NODE_PRIVATE(node); 1174 struct ng_fec_bundle *b; 1175 struct ng_mesg *resp = NULL; 1176 struct ng_mesg *msg; 1177 char *ifname; 1178 int error = 0; 1179 1180 NGI_GET_MSG(item, msg); 1181 b = &priv->fec_bundle; 1182 1183 switch (msg->header.typecookie) { 1184 case NGM_FEC_COOKIE: 1185 switch (msg->header.cmd) { 1186 case NGM_FEC_ADD_IFACE: 1187 ifname = msg->data; 1188 error = ng_fec_addport(priv, ifname); 1189 break; 1190 case NGM_FEC_DEL_IFACE: 1191 ifname = msg->data; 1192 error = ng_fec_delport(priv, ifname); 1193 break; 1194 case NGM_FEC_SET_MODE_MAC: 1195 b->fec_btype = FEC_BTYPE_MAC; 1196 break; 1197 #ifdef INET 1198 case NGM_FEC_SET_MODE_INET: 1199 b->fec_btype = FEC_BTYPE_INET; 1200 break; 1201 #ifdef INET6 1202 case NGM_FEC_SET_MODE_INET6: 1203 b->fec_btype = FEC_BTYPE_INET6; 1204 break; 1205 #endif 1206 #endif 1207 default: 1208 error = EINVAL; 1209 break; 1210 } 1211 break; 1212 default: 1213 error = EINVAL; 1214 break; 1215 } 1216 NG_RESPOND_MSG(error, node, item, resp); 1217 NG_FREE_MSG(msg); 1218 return (error); 1219 } 1220 1221 /* 1222 * Shutdown and remove the node and its associated interface. 1223 */ 1224 static int 1225 ng_fec_shutdown(node_p node) 1226 { 1227 const priv_p priv = NG_NODE_PRIVATE(node); 1228 struct ng_fec_bundle *b; 1229 struct ng_fec_portlist *p; 1230 1231 b = &priv->fec_bundle; 1232 ng_fec_stop(priv->ifp); 1233 1234 while (!TAILQ_EMPTY(&b->ng_fec_ports)) { 1235 p = TAILQ_FIRST(&b->ng_fec_ports); 1236 ng_fec_delport(priv, p->fec_if->if_xname); 1237 } 1238 1239 ether_ifdetach(priv->ifp); 1240 if_free_type(priv->ifp, IFT_ETHER); 1241 ifmedia_removeall(&priv->ifmedia); 1242 ng_fec_free_unit(priv->unit); 1243 FREE(priv, M_NETGRAPH); 1244 NG_NODE_SET_PRIVATE(node, NULL); 1245 NG_NODE_UNREF(node); 1246 return (0); 1247 } 1248 1249 /* 1250 * Handle loading and unloading for this node type. 1251 */ 1252 static int 1253 ng_fec_mod_event(module_t mod, int event, void *data) 1254 { 1255 int error = 0; 1256 1257 switch (event) { 1258 case MOD_LOAD: 1259 mtx_init(&ng_fec_mtx, "ng_fec", NULL, MTX_DEF); 1260 break; 1261 case MOD_UNLOAD: 1262 mtx_destroy(&ng_fec_mtx); 1263 break; 1264 default: 1265 error = EOPNOTSUPP; 1266 break; 1267 } 1268 return (error); 1269 }
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