1/* 2 * DECnet An implementation of the DECnet protocol suite for the LINUX 3 * operating system. DECnet is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * DECnet Routing Forwarding Information Base (Glue/Info List) 7 * 8 * Author: Steve Whitehouse <SteveW@ACM.org> 9 * 10 * 11 * Changes: 12 * Alexey Kuznetsov : SMP locking changes 13 * Steve Whitehouse : Rewrote it... Well to be more correct, I 14 * copied most of it from the ipv4 fib code. 15 * Steve Whitehouse : Updated it in style and fixed a few bugs 16 * which were fixed in the ipv4 code since 17 * this code was copied from it. 18 * 19 */ 20#include <linux/string.h> 21#include <linux/net.h> 22#include <linux/socket.h> 23#include <linux/slab.h> 24#include <linux/sockios.h> 25#include <linux/init.h> 26#include <linux/skbuff.h> 27#include <linux/netlink.h> 28#include <linux/rtnetlink.h> 29#include <linux/proc_fs.h> 30#include <linux/netdevice.h> 31#include <linux/timer.h> 32#include <linux/spinlock.h> 33#include <asm/atomic.h> 34#include <asm/uaccess.h> 35#include <net/neighbour.h> 36#include <net/dst.h> 37#include <net/flow.h> 38#include <net/fib_rules.h> 39#include <net/dn.h> 40#include <net/dn_route.h> 41#include <net/dn_fib.h> 42#include <net/dn_neigh.h> 43#include <net/dn_dev.h> 44 45#define RT_MIN_TABLE 1 46 47#define for_fib_info() { struct dn_fib_info *fi;\ 48 for(fi = dn_fib_info_list; fi; fi = fi->fib_next) 49#define endfor_fib_info() } 50 51#define for_nexthops(fi) { int nhsel; const struct dn_fib_nh *nh;\ 52 for(nhsel = 0, nh = (fi)->fib_nh; nhsel < (fi)->fib_nhs; nh++, nhsel++) 53 54#define change_nexthops(fi) { int nhsel; struct dn_fib_nh *nh;\ 55 for(nhsel = 0, nh = (struct dn_fib_nh *)((fi)->fib_nh); nhsel < (fi)->fib_nhs; nh++, nhsel++) 56 57#define endfor_nexthops(fi) } 58 59static DEFINE_SPINLOCK(dn_fib_multipath_lock); 60static struct dn_fib_info *dn_fib_info_list; 61static DEFINE_SPINLOCK(dn_fib_info_lock); 62 63static struct 64{ 65 int error; 66 u8 scope; 67} dn_fib_props[RTN_MAX+1] = { 68 [RTN_UNSPEC] = { .error = 0, .scope = RT_SCOPE_NOWHERE }, 69 [RTN_UNICAST] = { .error = 0, .scope = RT_SCOPE_UNIVERSE }, 70 [RTN_LOCAL] = { .error = 0, .scope = RT_SCOPE_HOST }, 71 [RTN_BROADCAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE }, 72 [RTN_ANYCAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE }, 73 [RTN_MULTICAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE }, 74 [RTN_BLACKHOLE] = { .error = -EINVAL, .scope = RT_SCOPE_UNIVERSE }, 75 [RTN_UNREACHABLE] = { .error = -EHOSTUNREACH, .scope = RT_SCOPE_UNIVERSE }, 76 [RTN_PROHIBIT] = { .error = -EACCES, .scope = RT_SCOPE_UNIVERSE }, 77 [RTN_THROW] = { .error = -EAGAIN, .scope = RT_SCOPE_UNIVERSE }, 78 [RTN_NAT] = { .error = 0, .scope = RT_SCOPE_NOWHERE }, 79 [RTN_XRESOLVE] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE }, 80}; 81 82static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force); 83static int dn_fib_sync_up(struct net_device *dev); 84 85void dn_fib_free_info(struct dn_fib_info *fi) 86{ 87 if (fi->fib_dead == 0) { 88 printk(KERN_DEBUG "DECnet: BUG! Attempt to free alive dn_fib_info\n"); 89 return; 90 } 91 92 change_nexthops(fi) { 93 if (nh->nh_dev) 94 dev_put(nh->nh_dev); 95 nh->nh_dev = NULL; 96 } endfor_nexthops(fi); 97 kfree(fi); 98} 99 100void dn_fib_release_info(struct dn_fib_info *fi) 101{ 102 spin_lock(&dn_fib_info_lock); 103 if (fi && --fi->fib_treeref == 0) { 104 if (fi->fib_next) 105 fi->fib_next->fib_prev = fi->fib_prev; 106 if (fi->fib_prev) 107 fi->fib_prev->fib_next = fi->fib_next; 108 if (fi == dn_fib_info_list) 109 dn_fib_info_list = fi->fib_next; 110 fi->fib_dead = 1; 111 dn_fib_info_put(fi); 112 } 113 spin_unlock(&dn_fib_info_lock); 114} 115 116static inline int dn_fib_nh_comp(const struct dn_fib_info *fi, const struct dn_fib_info *ofi) 117{ 118 const struct dn_fib_nh *onh = ofi->fib_nh; 119 120 for_nexthops(fi) { 121 if (nh->nh_oif != onh->nh_oif || 122 nh->nh_gw != onh->nh_gw || 123 nh->nh_scope != onh->nh_scope || 124 nh->nh_weight != onh->nh_weight || 125 ((nh->nh_flags^onh->nh_flags)&~RTNH_F_DEAD)) 126 return -1; 127 onh++; 128 } endfor_nexthops(fi); 129 return 0; 130} 131 132static inline struct dn_fib_info *dn_fib_find_info(const struct dn_fib_info *nfi) 133{ 134 for_fib_info() { 135 if (fi->fib_nhs != nfi->fib_nhs) 136 continue; 137 if (nfi->fib_protocol == fi->fib_protocol && 138 nfi->fib_prefsrc == fi->fib_prefsrc && 139 nfi->fib_priority == fi->fib_priority && 140 memcmp(nfi->fib_metrics, fi->fib_metrics, sizeof(fi->fib_metrics)) == 0 && 141 ((nfi->fib_flags^fi->fib_flags)&~RTNH_F_DEAD) == 0 && 142 (nfi->fib_nhs == 0 || dn_fib_nh_comp(fi, nfi) == 0)) 143 return fi; 144 } endfor_fib_info(); 145 return NULL; 146} 147 148__le16 dn_fib_get_attr16(struct rtattr *attr, int attrlen, int type) 149{ 150 while(RTA_OK(attr,attrlen)) { 151 if (attr->rta_type == type) 152 return *(__le16*)RTA_DATA(attr); 153 attr = RTA_NEXT(attr, attrlen); 154 } 155 156 return 0; 157} 158 159static int dn_fib_count_nhs(struct rtattr *rta) 160{ 161 int nhs = 0; 162 struct rtnexthop *nhp = RTA_DATA(rta); 163 int nhlen = RTA_PAYLOAD(rta); 164 165 while(nhlen >= (int)sizeof(struct rtnexthop)) { 166 if ((nhlen -= nhp->rtnh_len) < 0) 167 return 0; 168 nhs++; 169 nhp = RTNH_NEXT(nhp); 170 } 171 172 return nhs; 173} 174 175static int dn_fib_get_nhs(struct dn_fib_info *fi, const struct rtattr *rta, const struct rtmsg *r) 176{ 177 struct rtnexthop *nhp = RTA_DATA(rta); 178 int nhlen = RTA_PAYLOAD(rta); 179 180 change_nexthops(fi) { 181 int attrlen = nhlen - sizeof(struct rtnexthop); 182 if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0) 183 return -EINVAL; 184 185 nh->nh_flags = (r->rtm_flags&~0xFF) | nhp->rtnh_flags; 186 nh->nh_oif = nhp->rtnh_ifindex; 187 nh->nh_weight = nhp->rtnh_hops + 1; 188 189 if (attrlen) { 190 nh->nh_gw = dn_fib_get_attr16(RTNH_DATA(nhp), attrlen, RTA_GATEWAY); 191 } 192 nhp = RTNH_NEXT(nhp); 193 } endfor_nexthops(fi); 194 195 return 0; 196} 197 198 199static int dn_fib_check_nh(const struct rtmsg *r, struct dn_fib_info *fi, struct dn_fib_nh *nh) 200{ 201 int err; 202 203 if (nh->nh_gw) { 204 struct flowi fl; 205 struct dn_fib_res res; 206 207 if (nh->nh_flags&RTNH_F_ONLINK) { 208 struct net_device *dev; 209 210 if (r->rtm_scope >= RT_SCOPE_LINK) 211 return -EINVAL; 212 if (dnet_addr_type(nh->nh_gw) != RTN_UNICAST) 213 return -EINVAL; 214 if ((dev = __dev_get_by_index(&init_net, nh->nh_oif)) == NULL) 215 return -ENODEV; 216 if (!(dev->flags&IFF_UP)) 217 return -ENETDOWN; 218 nh->nh_dev = dev; 219 dev_hold(dev); 220 nh->nh_scope = RT_SCOPE_LINK; 221 return 0; 222 } 223 224 memset(&fl, 0, sizeof(fl)); 225 fl.fld_dst = nh->nh_gw; 226 fl.oif = nh->nh_oif; 227 fl.fld_scope = r->rtm_scope + 1; 228 229 if (fl.fld_scope < RT_SCOPE_LINK) 230 fl.fld_scope = RT_SCOPE_LINK; 231 232 if ((err = dn_fib_lookup(&fl, &res)) != 0) 233 return err; 234 235 err = -EINVAL; 236 if (res.type != RTN_UNICAST && res.type != RTN_LOCAL) 237 goto out; 238 nh->nh_scope = res.scope; 239 nh->nh_oif = DN_FIB_RES_OIF(res); 240 nh->nh_dev = DN_FIB_RES_DEV(res); 241 if (nh->nh_dev == NULL) 242 goto out; 243 dev_hold(nh->nh_dev); 244 err = -ENETDOWN; 245 if (!(nh->nh_dev->flags & IFF_UP)) 246 goto out; 247 err = 0; 248out: 249 dn_fib_res_put(&res); 250 return err; 251 } else { 252 struct net_device *dev; 253 254 if (nh->nh_flags&(RTNH_F_PERVASIVE|RTNH_F_ONLINK)) 255 return -EINVAL; 256 257 dev = __dev_get_by_index(&init_net, nh->nh_oif); 258 if (dev == NULL || dev->dn_ptr == NULL) 259 return -ENODEV; 260 if (!(dev->flags&IFF_UP)) 261 return -ENETDOWN; 262 nh->nh_dev = dev; 263 dev_hold(nh->nh_dev); 264 nh->nh_scope = RT_SCOPE_HOST; 265 } 266 267 return 0; 268} 269 270 271struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r, struct dn_kern_rta *rta, const struct nlmsghdr *nlh, int *errp) 272{ 273 int err; 274 struct dn_fib_info *fi = NULL; 275 struct dn_fib_info *ofi; 276 int nhs = 1; 277 278 if (r->rtm_type > RTN_MAX) 279 goto err_inval; 280 281 if (dn_fib_props[r->rtm_type].scope > r->rtm_scope) 282 goto err_inval; 283 284 if (rta->rta_mp) { 285 nhs = dn_fib_count_nhs(rta->rta_mp); 286 if (nhs == 0) 287 goto err_inval; 288 } 289 290 fi = kzalloc(sizeof(*fi)+nhs*sizeof(struct dn_fib_nh), GFP_KERNEL); 291 err = -ENOBUFS; 292 if (fi == NULL) 293 goto failure; 294 295 fi->fib_protocol = r->rtm_protocol; 296 fi->fib_nhs = nhs; 297 fi->fib_flags = r->rtm_flags; 298 if (rta->rta_priority) 299 fi->fib_priority = *rta->rta_priority; 300 if (rta->rta_mx) { 301 int attrlen = RTA_PAYLOAD(rta->rta_mx); 302 struct rtattr *attr = RTA_DATA(rta->rta_mx); 303 304 while(RTA_OK(attr, attrlen)) { 305 unsigned flavour = attr->rta_type; 306 if (flavour) { 307 if (flavour > RTAX_MAX) 308 goto err_inval; 309 fi->fib_metrics[flavour-1] = *(unsigned*)RTA_DATA(attr); 310 } 311 attr = RTA_NEXT(attr, attrlen); 312 } 313 } 314 if (rta->rta_prefsrc) 315 memcpy(&fi->fib_prefsrc, rta->rta_prefsrc, 2); 316 317 if (rta->rta_mp) { 318 if ((err = dn_fib_get_nhs(fi, rta->rta_mp, r)) != 0) 319 goto failure; 320 if (rta->rta_oif && fi->fib_nh->nh_oif != *rta->rta_oif) 321 goto err_inval; 322 if (rta->rta_gw && memcmp(&fi->fib_nh->nh_gw, rta->rta_gw, 2)) 323 goto err_inval; 324 } else { 325 struct dn_fib_nh *nh = fi->fib_nh; 326 if (rta->rta_oif) 327 nh->nh_oif = *rta->rta_oif; 328 if (rta->rta_gw) 329 memcpy(&nh->nh_gw, rta->rta_gw, 2); 330 nh->nh_flags = r->rtm_flags; 331 nh->nh_weight = 1; 332 } 333 334 if (r->rtm_type == RTN_NAT) { 335 if (rta->rta_gw == NULL || nhs != 1 || rta->rta_oif) 336 goto err_inval; 337 memcpy(&fi->fib_nh->nh_gw, rta->rta_gw, 2); 338 goto link_it; 339 } 340 341 if (dn_fib_props[r->rtm_type].error) { 342 if (rta->rta_gw || rta->rta_oif || rta->rta_mp) 343 goto err_inval; 344 goto link_it; 345 } 346 347 if (r->rtm_scope > RT_SCOPE_HOST) 348 goto err_inval; 349 350 if (r->rtm_scope == RT_SCOPE_HOST) { 351 struct dn_fib_nh *nh = fi->fib_nh; 352 353 /* Local address is added */ 354 if (nhs != 1 || nh->nh_gw) 355 goto err_inval; 356 nh->nh_scope = RT_SCOPE_NOWHERE; 357 nh->nh_dev = dev_get_by_index(&init_net, fi->fib_nh->nh_oif); 358 err = -ENODEV; 359 if (nh->nh_dev == NULL) 360 goto failure; 361 } else { 362 change_nexthops(fi) { 363 if ((err = dn_fib_check_nh(r, fi, nh)) != 0) 364 goto failure; 365 } endfor_nexthops(fi) 366 } 367 368 if (fi->fib_prefsrc) { 369 if (r->rtm_type != RTN_LOCAL || rta->rta_dst == NULL || 370 memcmp(&fi->fib_prefsrc, rta->rta_dst, 2)) 371 if (dnet_addr_type(fi->fib_prefsrc) != RTN_LOCAL) 372 goto err_inval; 373 } 374 375link_it: 376 if ((ofi = dn_fib_find_info(fi)) != NULL) { 377 fi->fib_dead = 1; 378 dn_fib_free_info(fi); 379 ofi->fib_treeref++; 380 return ofi; 381 } 382 383 fi->fib_treeref++; 384 atomic_inc(&fi->fib_clntref); 385 spin_lock(&dn_fib_info_lock); 386 fi->fib_next = dn_fib_info_list; 387 fi->fib_prev = NULL; 388 if (dn_fib_info_list) 389 dn_fib_info_list->fib_prev = fi; 390 dn_fib_info_list = fi; 391 spin_unlock(&dn_fib_info_lock); 392 return fi; 393 394err_inval: 395 err = -EINVAL; 396 397failure: 398 *errp = err; 399 if (fi) { 400 fi->fib_dead = 1; 401 dn_fib_free_info(fi); 402 } 403 404 return NULL; 405} 406 407int dn_fib_semantic_match(int type, struct dn_fib_info *fi, const struct flowi *fl, struct dn_fib_res *res) 408{ 409 int err = dn_fib_props[type].error; 410 411 if (err == 0) { 412 if (fi->fib_flags & RTNH_F_DEAD) 413 return 1; 414 415 res->fi = fi; 416 417 switch(type) { 418 case RTN_NAT: 419 DN_FIB_RES_RESET(*res); 420 atomic_inc(&fi->fib_clntref); 421 return 0; 422 case RTN_UNICAST: 423 case RTN_LOCAL: 424 for_nexthops(fi) { 425 if (nh->nh_flags & RTNH_F_DEAD) 426 continue; 427 if (!fl->oif || fl->oif == nh->nh_oif) 428 break; 429 } 430 if (nhsel < fi->fib_nhs) { 431 res->nh_sel = nhsel; 432 atomic_inc(&fi->fib_clntref); 433 return 0; 434 } 435 endfor_nexthops(fi); 436 res->fi = NULL; 437 return 1; 438 default: 439 if (net_ratelimit()) 440 printk("DECnet: impossible routing event : dn_fib_semantic_match type=%d\n", type); 441 res->fi = NULL; 442 return -EINVAL; 443 } 444 } 445 return err; 446} 447 448void dn_fib_select_multipath(const struct flowi *fl, struct dn_fib_res *res) 449{ 450 struct dn_fib_info *fi = res->fi; 451 int w; 452 453 spin_lock_bh(&dn_fib_multipath_lock); 454 if (fi->fib_power <= 0) { 455 int power = 0; 456 change_nexthops(fi) { 457 if (!(nh->nh_flags&RTNH_F_DEAD)) { 458 power += nh->nh_weight; 459 nh->nh_power = nh->nh_weight; 460 } 461 } endfor_nexthops(fi); 462 fi->fib_power = power; 463 if (power < 0) { 464 spin_unlock_bh(&dn_fib_multipath_lock); 465 res->nh_sel = 0; 466 return; 467 } 468 } 469 470 w = jiffies % fi->fib_power; 471 472 change_nexthops(fi) { 473 if (!(nh->nh_flags&RTNH_F_DEAD) && nh->nh_power) { 474 if ((w -= nh->nh_power) <= 0) { 475 nh->nh_power--; 476 fi->fib_power--; 477 res->nh_sel = nhsel; 478 spin_unlock_bh(&dn_fib_multipath_lock); 479 return; 480 } 481 } 482 } endfor_nexthops(fi); 483 res->nh_sel = 0; 484 spin_unlock_bh(&dn_fib_multipath_lock); 485} 486 487 488static int dn_fib_check_attr(struct rtmsg *r, struct rtattr **rta) 489{ 490 int i; 491 492 for(i = 1; i <= RTA_MAX; i++) { 493 struct rtattr *attr = rta[i-1]; 494 if (attr) { 495 if (RTA_PAYLOAD(attr) < 4 && RTA_PAYLOAD(attr) != 2) 496 return -EINVAL; 497 if (i != RTA_MULTIPATH && i != RTA_METRICS && 498 i != RTA_TABLE) 499 rta[i-1] = (struct rtattr *)RTA_DATA(attr); 500 } 501 } 502 503 return 0; 504} 505 506static int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 507{ 508 struct net *net = sock_net(skb->sk); 509 struct dn_fib_table *tb; 510 struct rtattr **rta = arg; 511 struct rtmsg *r = NLMSG_DATA(nlh); 512 513 if (!net_eq(net, &init_net)) 514 return -EINVAL; 515 516 if (dn_fib_check_attr(r, rta)) 517 return -EINVAL; 518 519 tb = dn_fib_get_table(rtm_get_table(rta, r->rtm_table), 0); 520 if (tb) 521 return tb->delete(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb)); 522 523 return -ESRCH; 524} 525 526static int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 527{ 528 struct net *net = sock_net(skb->sk); 529 struct dn_fib_table *tb; 530 struct rtattr **rta = arg; 531 struct rtmsg *r = NLMSG_DATA(nlh); 532 533 if (!net_eq(net, &init_net)) 534 return -EINVAL; 535 536 if (dn_fib_check_attr(r, rta)) 537 return -EINVAL; 538 539 tb = dn_fib_get_table(rtm_get_table(rta, r->rtm_table), 1); 540 if (tb) 541 return tb->insert(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb)); 542 543 return -ENOBUFS; 544} 545 546static void fib_magic(int cmd, int type, __le16 dst, int dst_len, struct dn_ifaddr *ifa) 547{ 548 struct dn_fib_table *tb; 549 struct { 550 struct nlmsghdr nlh; 551 struct rtmsg rtm; 552 } req; 553 struct dn_kern_rta rta; 554 555 memset(&req.rtm, 0, sizeof(req.rtm)); 556 memset(&rta, 0, sizeof(rta)); 557 558 if (type == RTN_UNICAST) 559 tb = dn_fib_get_table(RT_MIN_TABLE, 1); 560 else 561 tb = dn_fib_get_table(RT_TABLE_LOCAL, 1); 562 563 if (tb == NULL) 564 return; 565 566 req.nlh.nlmsg_len = sizeof(req); 567 req.nlh.nlmsg_type = cmd; 568 req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND; 569 req.nlh.nlmsg_pid = 0; 570 req.nlh.nlmsg_seq = 0; 571 572 req.rtm.rtm_dst_len = dst_len; 573 req.rtm.rtm_table = tb->n; 574 req.rtm.rtm_protocol = RTPROT_KERNEL; 575 req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST); 576 req.rtm.rtm_type = type; 577 578 rta.rta_dst = &dst; 579 rta.rta_prefsrc = &ifa->ifa_local; 580 rta.rta_oif = &ifa->ifa_dev->dev->ifindex; 581 582 if (cmd == RTM_NEWROUTE) 583 tb->insert(tb, &req.rtm, &rta, &req.nlh, NULL); 584 else 585 tb->delete(tb, &req.rtm, &rta, &req.nlh, NULL); 586} 587 588static void dn_fib_add_ifaddr(struct dn_ifaddr *ifa) 589{ 590 591 fib_magic(RTM_NEWROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa); 592 593} 594 595static void dn_fib_del_ifaddr(struct dn_ifaddr *ifa) 596{ 597 int found_it = 0; 598 struct net_device *dev; 599 struct dn_dev *dn_db; 600 struct dn_ifaddr *ifa2; 601 602 ASSERT_RTNL(); 603 604 /* Scan device list */ 605 rcu_read_lock(); 606 for_each_netdev_rcu(&init_net, dev) { 607 dn_db = dev->dn_ptr; 608 if (dn_db == NULL) 609 continue; 610 for(ifa2 = dn_db->ifa_list; ifa2; ifa2 = ifa2->ifa_next) { 611 if (ifa2->ifa_local == ifa->ifa_local) { 612 found_it = 1; 613 break; 614 } 615 } 616 } 617 rcu_read_unlock(); 618 619 if (found_it == 0) { 620 fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa); 621 622 if (dnet_addr_type(ifa->ifa_local) != RTN_LOCAL) { 623 if (dn_fib_sync_down(ifa->ifa_local, NULL, 0)) 624 dn_fib_flush(); 625 } 626 } 627} 628 629static void dn_fib_disable_addr(struct net_device *dev, int force) 630{ 631 if (dn_fib_sync_down(0, dev, force)) 632 dn_fib_flush(); 633 dn_rt_cache_flush(0); 634 neigh_ifdown(&dn_neigh_table, dev); 635} 636 637static int dn_fib_dnaddr_event(struct notifier_block *this, unsigned long event, void *ptr) 638{ 639 struct dn_ifaddr *ifa = (struct dn_ifaddr *)ptr; 640 641 switch(event) { 642 case NETDEV_UP: 643 dn_fib_add_ifaddr(ifa); 644 dn_fib_sync_up(ifa->ifa_dev->dev); 645 dn_rt_cache_flush(-1); 646 break; 647 case NETDEV_DOWN: 648 dn_fib_del_ifaddr(ifa); 649 if (ifa->ifa_dev && ifa->ifa_dev->ifa_list == NULL) { 650 dn_fib_disable_addr(ifa->ifa_dev->dev, 1); 651 } else { 652 dn_rt_cache_flush(-1); 653 } 654 break; 655 } 656 return NOTIFY_DONE; 657} 658 659static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force) 660{ 661 int ret = 0; 662 int scope = RT_SCOPE_NOWHERE; 663 664 if (force) 665 scope = -1; 666 667 for_fib_info() { 668 /* 669 * This makes no sense for DECnet.... we will almost 670 * certainly have more than one local address the same 671 * over all our interfaces. It needs thinking about 672 * some more. 673 */ 674 if (local && fi->fib_prefsrc == local) { 675 fi->fib_flags |= RTNH_F_DEAD; 676 ret++; 677 } else if (dev && fi->fib_nhs) { 678 int dead = 0; 679 680 change_nexthops(fi) { 681 if (nh->nh_flags&RTNH_F_DEAD) 682 dead++; 683 else if (nh->nh_dev == dev && 684 nh->nh_scope != scope) { 685 spin_lock_bh(&dn_fib_multipath_lock); 686 nh->nh_flags |= RTNH_F_DEAD; 687 fi->fib_power -= nh->nh_power; 688 nh->nh_power = 0; 689 spin_unlock_bh(&dn_fib_multipath_lock); 690 dead++; 691 } 692 } endfor_nexthops(fi) 693 if (dead == fi->fib_nhs) { 694 fi->fib_flags |= RTNH_F_DEAD; 695 ret++; 696 } 697 } 698 } endfor_fib_info(); 699 return ret; 700} 701 702 703static int dn_fib_sync_up(struct net_device *dev) 704{ 705 int ret = 0; 706 707 if (!(dev->flags&IFF_UP)) 708 return 0; 709 710 for_fib_info() { 711 int alive = 0; 712 713 change_nexthops(fi) { 714 if (!(nh->nh_flags&RTNH_F_DEAD)) { 715 alive++; 716 continue; 717 } 718 if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP)) 719 continue; 720 if (nh->nh_dev != dev || dev->dn_ptr == NULL) 721 continue; 722 alive++; 723 spin_lock_bh(&dn_fib_multipath_lock); 724 nh->nh_power = 0; 725 nh->nh_flags &= ~RTNH_F_DEAD; 726 spin_unlock_bh(&dn_fib_multipath_lock); 727 } endfor_nexthops(fi); 728 729 if (alive > 0) { 730 fi->fib_flags &= ~RTNH_F_DEAD; 731 ret++; 732 } 733 } endfor_fib_info(); 734 return ret; 735} 736 737static struct notifier_block dn_fib_dnaddr_notifier = { 738 .notifier_call = dn_fib_dnaddr_event, 739}; 740 741void __exit dn_fib_cleanup(void) 742{ 743 dn_fib_table_cleanup(); 744 dn_fib_rules_cleanup(); 745 746 unregister_dnaddr_notifier(&dn_fib_dnaddr_notifier); 747} 748 749 750void __init dn_fib_init(void) 751{ 752 dn_fib_table_init(); 753 dn_fib_rules_init(); 754 755 register_dnaddr_notifier(&dn_fib_dnaddr_notifier); 756 757 rtnl_register(PF_DECnet, RTM_NEWROUTE, dn_fib_rtm_newroute, NULL); 758 rtnl_register(PF_DECnet, RTM_DELROUTE, dn_fib_rtm_delroute, NULL); 759} 760