linux/net/decnet/dn_fib.c
<<
>>
Prefs
   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * DECnet       An implementation of the DECnet protocol suite for the LINUX
   4 *              operating system.  DECnet is implemented using the  BSD Socket
   5 *              interface as the means of communication with the user level.
   6 *
   7 *              DECnet Routing Forwarding Information Base (Glue/Info List)
   8 *
   9 * Author:      Steve Whitehouse <SteveW@ACM.org>
  10 *
  11 *
  12 * Changes:
  13 *              Alexey Kuznetsov : SMP locking changes
  14 *              Steve Whitehouse : Rewrote it... Well to be more correct, I
  15 *                                 copied most of it from the ipv4 fib code.
  16 *              Steve Whitehouse : Updated it in style and fixed a few bugs
  17 *                                 which were fixed in the ipv4 code since
  18 *                                 this code was copied from it.
  19 *
  20 */
  21#include <linux/string.h>
  22#include <linux/net.h>
  23#include <linux/socket.h>
  24#include <linux/slab.h>
  25#include <linux/sockios.h>
  26#include <linux/init.h>
  27#include <linux/skbuff.h>
  28#include <linux/netlink.h>
  29#include <linux/rtnetlink.h>
  30#include <linux/proc_fs.h>
  31#include <linux/netdevice.h>
  32#include <linux/timer.h>
  33#include <linux/spinlock.h>
  34#include <linux/atomic.h>
  35#include <linux/uaccess.h>
  36#include <net/neighbour.h>
  37#include <net/dst.h>
  38#include <net/flow.h>
  39#include <net/fib_rules.h>
  40#include <net/dn.h>
  41#include <net/dn_route.h>
  42#include <net/dn_fib.h>
  43#include <net/dn_neigh.h>
  44#include <net/dn_dev.h>
  45#include <net/rtnh.h>
  46
  47#define RT_MIN_TABLE 1
  48
  49#define for_fib_info() { struct dn_fib_info *fi;\
  50        for(fi = dn_fib_info_list; fi; fi = fi->fib_next)
  51#define endfor_fib_info() }
  52
  53#define for_nexthops(fi) { int nhsel; const struct dn_fib_nh *nh;\
  54        for(nhsel = 0, nh = (fi)->fib_nh; nhsel < (fi)->fib_nhs; nh++, nhsel++)
  55
  56#define change_nexthops(fi) { int nhsel; struct dn_fib_nh *nh;\
  57        for(nhsel = 0, nh = (struct dn_fib_nh *)((fi)->fib_nh); nhsel < (fi)->fib_nhs; nh++, nhsel++)
  58
  59#define endfor_nexthops(fi) }
  60
  61static DEFINE_SPINLOCK(dn_fib_multipath_lock);
  62static struct dn_fib_info *dn_fib_info_list;
  63static DEFINE_SPINLOCK(dn_fib_info_lock);
  64
  65static struct
  66{
  67        int error;
  68        u8 scope;
  69} dn_fib_props[RTN_MAX+1] = {
  70        [RTN_UNSPEC] =      { .error = 0,       .scope = RT_SCOPE_NOWHERE },
  71        [RTN_UNICAST] =     { .error = 0,       .scope = RT_SCOPE_UNIVERSE },
  72        [RTN_LOCAL] =       { .error = 0,       .scope = RT_SCOPE_HOST },
  73        [RTN_BROADCAST] =   { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
  74        [RTN_ANYCAST] =     { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
  75        [RTN_MULTICAST] =   { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
  76        [RTN_BLACKHOLE] =   { .error = -EINVAL, .scope = RT_SCOPE_UNIVERSE },
  77        [RTN_UNREACHABLE] = { .error = -EHOSTUNREACH, .scope = RT_SCOPE_UNIVERSE },
  78        [RTN_PROHIBIT] =    { .error = -EACCES, .scope = RT_SCOPE_UNIVERSE },
  79        [RTN_THROW] =       { .error = -EAGAIN, .scope = RT_SCOPE_UNIVERSE },
  80        [RTN_NAT] =         { .error = 0,       .scope = RT_SCOPE_NOWHERE },
  81        [RTN_XRESOLVE] =    { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
  82};
  83
  84static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force);
  85static int dn_fib_sync_up(struct net_device *dev);
  86
  87void dn_fib_free_info(struct dn_fib_info *fi)
  88{
  89        if (fi->fib_dead == 0) {
  90                printk(KERN_DEBUG "DECnet: BUG! Attempt to free alive dn_fib_info\n");
  91                return;
  92        }
  93
  94        change_nexthops(fi) {
  95                dev_put(nh->nh_dev);
  96                nh->nh_dev = NULL;
  97        } endfor_nexthops(fi);
  98        kfree(fi);
  99}
 100
 101void dn_fib_release_info(struct dn_fib_info *fi)
 102{
 103        spin_lock(&dn_fib_info_lock);
 104        if (fi && refcount_dec_and_test(&fi->fib_treeref)) {
 105                if (fi->fib_next)
 106                        fi->fib_next->fib_prev = fi->fib_prev;
 107                if (fi->fib_prev)
 108                        fi->fib_prev->fib_next = fi->fib_next;
 109                if (fi == dn_fib_info_list)
 110                        dn_fib_info_list = fi->fib_next;
 111                fi->fib_dead = 1;
 112                dn_fib_info_put(fi);
 113        }
 114        spin_unlock(&dn_fib_info_lock);
 115}
 116
 117static inline int dn_fib_nh_comp(const struct dn_fib_info *fi, const struct dn_fib_info *ofi)
 118{
 119        const struct dn_fib_nh *onh = ofi->fib_nh;
 120
 121        for_nexthops(fi) {
 122                if (nh->nh_oif != onh->nh_oif ||
 123                        nh->nh_gw != onh->nh_gw ||
 124                        nh->nh_scope != onh->nh_scope ||
 125                        nh->nh_weight != onh->nh_weight ||
 126                        ((nh->nh_flags^onh->nh_flags)&~RTNH_F_DEAD))
 127                                return -1;
 128                onh++;
 129        } endfor_nexthops(fi);
 130        return 0;
 131}
 132
 133static inline struct dn_fib_info *dn_fib_find_info(const struct dn_fib_info *nfi)
 134{
 135        for_fib_info() {
 136                if (fi->fib_nhs != nfi->fib_nhs)
 137                        continue;
 138                if (nfi->fib_protocol == fi->fib_protocol &&
 139                        nfi->fib_prefsrc == fi->fib_prefsrc &&
 140                        nfi->fib_priority == fi->fib_priority &&
 141                        memcmp(nfi->fib_metrics, fi->fib_metrics, sizeof(fi->fib_metrics)) == 0 &&
 142                        ((nfi->fib_flags^fi->fib_flags)&~RTNH_F_DEAD) == 0 &&
 143                        (nfi->fib_nhs == 0 || dn_fib_nh_comp(fi, nfi) == 0))
 144                                return fi;
 145        } endfor_fib_info();
 146        return NULL;
 147}
 148
 149static int dn_fib_count_nhs(const struct nlattr *attr)
 150{
 151        struct rtnexthop *nhp = nla_data(attr);
 152        int nhs = 0, nhlen = nla_len(attr);
 153
 154        while (rtnh_ok(nhp, nhlen)) {
 155                nhs++;
 156                nhp = rtnh_next(nhp, &nhlen);
 157        }
 158
 159        /* leftover implies invalid nexthop configuration, discard it */
 160        return nhlen > 0 ? 0 : nhs;
 161}
 162
 163static int dn_fib_get_nhs(struct dn_fib_info *fi, const struct nlattr *attr,
 164                          const struct rtmsg *r)
 165{
 166        struct rtnexthop *nhp = nla_data(attr);
 167        int nhlen = nla_len(attr);
 168
 169        change_nexthops(fi) {
 170                int attrlen;
 171
 172                if (!rtnh_ok(nhp, nhlen))
 173                        return -EINVAL;
 174
 175                nh->nh_flags  = (r->rtm_flags&~0xFF) | nhp->rtnh_flags;
 176                nh->nh_oif    = nhp->rtnh_ifindex;
 177                nh->nh_weight = nhp->rtnh_hops + 1;
 178
 179                attrlen = rtnh_attrlen(nhp);
 180                if (attrlen > 0) {
 181                        struct nlattr *gw_attr;
 182
 183                        gw_attr = nla_find((struct nlattr *) (nhp + 1), attrlen, RTA_GATEWAY);
 184                        nh->nh_gw = gw_attr ? nla_get_le16(gw_attr) : 0;
 185                }
 186
 187                nhp = rtnh_next(nhp, &nhlen);
 188        } endfor_nexthops(fi);
 189
 190        return 0;
 191}
 192
 193
 194static int dn_fib_check_nh(const struct rtmsg *r, struct dn_fib_info *fi, struct dn_fib_nh *nh)
 195{
 196        int err;
 197
 198        if (nh->nh_gw) {
 199                struct flowidn fld;
 200                struct dn_fib_res res;
 201
 202                if (nh->nh_flags&RTNH_F_ONLINK) {
 203                        struct net_device *dev;
 204
 205                        if (r->rtm_scope >= RT_SCOPE_LINK)
 206                                return -EINVAL;
 207                        if (dnet_addr_type(nh->nh_gw) != RTN_UNICAST)
 208                                return -EINVAL;
 209                        if ((dev = __dev_get_by_index(&init_net, nh->nh_oif)) == NULL)
 210                                return -ENODEV;
 211                        if (!(dev->flags&IFF_UP))
 212                                return -ENETDOWN;
 213                        nh->nh_dev = dev;
 214                        dev_hold(dev);
 215                        nh->nh_scope = RT_SCOPE_LINK;
 216                        return 0;
 217                }
 218
 219                memset(&fld, 0, sizeof(fld));
 220                fld.daddr = nh->nh_gw;
 221                fld.flowidn_oif = nh->nh_oif;
 222                fld.flowidn_scope = r->rtm_scope + 1;
 223
 224                if (fld.flowidn_scope < RT_SCOPE_LINK)
 225                        fld.flowidn_scope = RT_SCOPE_LINK;
 226
 227                if ((err = dn_fib_lookup(&fld, &res)) != 0)
 228                        return err;
 229
 230                err = -EINVAL;
 231                if (res.type != RTN_UNICAST && res.type != RTN_LOCAL)
 232                        goto out;
 233                nh->nh_scope = res.scope;
 234                nh->nh_oif = DN_FIB_RES_OIF(res);
 235                nh->nh_dev = DN_FIB_RES_DEV(res);
 236                if (nh->nh_dev == NULL)
 237                        goto out;
 238                dev_hold(nh->nh_dev);
 239                err = -ENETDOWN;
 240                if (!(nh->nh_dev->flags & IFF_UP))
 241                        goto out;
 242                err = 0;
 243out:
 244                dn_fib_res_put(&res);
 245                return err;
 246        } else {
 247                struct net_device *dev;
 248
 249                if (nh->nh_flags&(RTNH_F_PERVASIVE|RTNH_F_ONLINK))
 250                        return -EINVAL;
 251
 252                dev = __dev_get_by_index(&init_net, nh->nh_oif);
 253                if (dev == NULL || dev->dn_ptr == NULL)
 254                        return -ENODEV;
 255                if (!(dev->flags&IFF_UP))
 256                        return -ENETDOWN;
 257                nh->nh_dev = dev;
 258                dev_hold(nh->nh_dev);
 259                nh->nh_scope = RT_SCOPE_HOST;
 260        }
 261
 262        return 0;
 263}
 264
 265
 266struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r, struct nlattr *attrs[],
 267                                       const struct nlmsghdr *nlh, int *errp)
 268{
 269        int err;
 270        struct dn_fib_info *fi = NULL;
 271        struct dn_fib_info *ofi;
 272        int nhs = 1;
 273
 274        if (r->rtm_type > RTN_MAX)
 275                goto err_inval;
 276
 277        if (dn_fib_props[r->rtm_type].scope > r->rtm_scope)
 278                goto err_inval;
 279
 280        if (attrs[RTA_MULTIPATH] &&
 281            (nhs = dn_fib_count_nhs(attrs[RTA_MULTIPATH])) == 0)
 282                goto err_inval;
 283
 284        fi = kzalloc(struct_size(fi, fib_nh, nhs), GFP_KERNEL);
 285        err = -ENOBUFS;
 286        if (fi == NULL)
 287                goto failure;
 288
 289        fi->fib_protocol = r->rtm_protocol;
 290        fi->fib_nhs = nhs;
 291        fi->fib_flags = r->rtm_flags;
 292
 293        if (attrs[RTA_PRIORITY])
 294                fi->fib_priority = nla_get_u32(attrs[RTA_PRIORITY]);
 295
 296        if (attrs[RTA_METRICS]) {
 297                struct nlattr *attr;
 298                int rem;
 299
 300                nla_for_each_nested(attr, attrs[RTA_METRICS], rem) {
 301                        int type = nla_type(attr);
 302
 303                        if (type) {
 304                                if (type > RTAX_MAX || type == RTAX_CC_ALGO ||
 305                                    nla_len(attr) < 4)
 306                                        goto err_inval;
 307
 308                                fi->fib_metrics[type-1] = nla_get_u32(attr);
 309                        }
 310                }
 311        }
 312
 313        if (attrs[RTA_PREFSRC])
 314                fi->fib_prefsrc = nla_get_le16(attrs[RTA_PREFSRC]);
 315
 316        if (attrs[RTA_MULTIPATH]) {
 317                if ((err = dn_fib_get_nhs(fi, attrs[RTA_MULTIPATH], r)) != 0)
 318                        goto failure;
 319
 320                if (attrs[RTA_OIF] &&
 321                    fi->fib_nh->nh_oif != nla_get_u32(attrs[RTA_OIF]))
 322                        goto err_inval;
 323
 324                if (attrs[RTA_GATEWAY] &&
 325                    fi->fib_nh->nh_gw != nla_get_le16(attrs[RTA_GATEWAY]))
 326                        goto err_inval;
 327        } else {
 328                struct dn_fib_nh *nh = fi->fib_nh;
 329
 330                if (attrs[RTA_OIF])
 331                        nh->nh_oif = nla_get_u32(attrs[RTA_OIF]);
 332
 333                if (attrs[RTA_GATEWAY])
 334                        nh->nh_gw = nla_get_le16(attrs[RTA_GATEWAY]);
 335
 336                nh->nh_flags = r->rtm_flags;
 337                nh->nh_weight = 1;
 338        }
 339
 340        if (r->rtm_type == RTN_NAT) {
 341                if (!attrs[RTA_GATEWAY] || nhs != 1 || attrs[RTA_OIF])
 342                        goto err_inval;
 343
 344                fi->fib_nh->nh_gw = nla_get_le16(attrs[RTA_GATEWAY]);
 345                goto link_it;
 346        }
 347
 348        if (dn_fib_props[r->rtm_type].error) {
 349                if (attrs[RTA_GATEWAY] || attrs[RTA_OIF] || attrs[RTA_MULTIPATH])
 350                        goto err_inval;
 351
 352                goto link_it;
 353        }
 354
 355        if (r->rtm_scope > RT_SCOPE_HOST)
 356                goto err_inval;
 357
 358        if (r->rtm_scope == RT_SCOPE_HOST) {
 359                struct dn_fib_nh *nh = fi->fib_nh;
 360
 361                /* Local address is added */
 362                if (nhs != 1 || nh->nh_gw)
 363                        goto err_inval;
 364                nh->nh_scope = RT_SCOPE_NOWHERE;
 365                nh->nh_dev = dev_get_by_index(&init_net, fi->fib_nh->nh_oif);
 366                err = -ENODEV;
 367                if (nh->nh_dev == NULL)
 368                        goto failure;
 369        } else {
 370                change_nexthops(fi) {
 371                        if ((err = dn_fib_check_nh(r, fi, nh)) != 0)
 372                                goto failure;
 373                } endfor_nexthops(fi)
 374        }
 375
 376        if (fi->fib_prefsrc) {
 377                if (r->rtm_type != RTN_LOCAL || !attrs[RTA_DST] ||
 378                    fi->fib_prefsrc != nla_get_le16(attrs[RTA_DST]))
 379                        if (dnet_addr_type(fi->fib_prefsrc) != RTN_LOCAL)
 380                                goto err_inval;
 381        }
 382
 383link_it:
 384        if ((ofi = dn_fib_find_info(fi)) != NULL) {
 385                fi->fib_dead = 1;
 386                dn_fib_free_info(fi);
 387                refcount_inc(&ofi->fib_treeref);
 388                return ofi;
 389        }
 390
 391        refcount_set(&fi->fib_treeref, 1);
 392        refcount_set(&fi->fib_clntref, 1);
 393        spin_lock(&dn_fib_info_lock);
 394        fi->fib_next = dn_fib_info_list;
 395        fi->fib_prev = NULL;
 396        if (dn_fib_info_list)
 397                dn_fib_info_list->fib_prev = fi;
 398        dn_fib_info_list = fi;
 399        spin_unlock(&dn_fib_info_lock);
 400        return fi;
 401
 402err_inval:
 403        err = -EINVAL;
 404
 405failure:
 406        *errp = err;
 407        if (fi) {
 408                fi->fib_dead = 1;
 409                dn_fib_free_info(fi);
 410        }
 411
 412        return NULL;
 413}
 414
 415int dn_fib_semantic_match(int type, struct dn_fib_info *fi, const struct flowidn *fld, struct dn_fib_res *res)
 416{
 417        int err = dn_fib_props[type].error;
 418
 419        if (err == 0) {
 420                if (fi->fib_flags & RTNH_F_DEAD)
 421                        return 1;
 422
 423                res->fi = fi;
 424
 425                switch (type) {
 426                case RTN_NAT:
 427                        DN_FIB_RES_RESET(*res);
 428                        refcount_inc(&fi->fib_clntref);
 429                        return 0;
 430                case RTN_UNICAST:
 431                case RTN_LOCAL:
 432                        for_nexthops(fi) {
 433                                if (nh->nh_flags & RTNH_F_DEAD)
 434                                        continue;
 435                                if (!fld->flowidn_oif ||
 436                                    fld->flowidn_oif == nh->nh_oif)
 437                                        break;
 438                        }
 439                        if (nhsel < fi->fib_nhs) {
 440                                res->nh_sel = nhsel;
 441                                refcount_inc(&fi->fib_clntref);
 442                                return 0;
 443                        }
 444                        endfor_nexthops(fi);
 445                        res->fi = NULL;
 446                        return 1;
 447                default:
 448                        net_err_ratelimited("DECnet: impossible routing event : dn_fib_semantic_match type=%d\n",
 449                                            type);
 450                        res->fi = NULL;
 451                        return -EINVAL;
 452                }
 453        }
 454        return err;
 455}
 456
 457void dn_fib_select_multipath(const struct flowidn *fld, struct dn_fib_res *res)
 458{
 459        struct dn_fib_info *fi = res->fi;
 460        int w;
 461
 462        spin_lock_bh(&dn_fib_multipath_lock);
 463        if (fi->fib_power <= 0) {
 464                int power = 0;
 465                change_nexthops(fi) {
 466                        if (!(nh->nh_flags&RTNH_F_DEAD)) {
 467                                power += nh->nh_weight;
 468                                nh->nh_power = nh->nh_weight;
 469                        }
 470                } endfor_nexthops(fi);
 471                fi->fib_power = power;
 472                if (power < 0) {
 473                        spin_unlock_bh(&dn_fib_multipath_lock);
 474                        res->nh_sel = 0;
 475                        return;
 476                }
 477        }
 478
 479        w = jiffies % fi->fib_power;
 480
 481        change_nexthops(fi) {
 482                if (!(nh->nh_flags&RTNH_F_DEAD) && nh->nh_power) {
 483                        if ((w -= nh->nh_power) <= 0) {
 484                                nh->nh_power--;
 485                                fi->fib_power--;
 486                                res->nh_sel = nhsel;
 487                                spin_unlock_bh(&dn_fib_multipath_lock);
 488                                return;
 489                        }
 490                }
 491        } endfor_nexthops(fi);
 492        res->nh_sel = 0;
 493        spin_unlock_bh(&dn_fib_multipath_lock);
 494}
 495
 496static inline u32 rtm_get_table(struct nlattr *attrs[], u8 table)
 497{
 498        if (attrs[RTA_TABLE])
 499                table = nla_get_u32(attrs[RTA_TABLE]);
 500
 501        return table;
 502}
 503
 504static int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
 505                               struct netlink_ext_ack *extack)
 506{
 507        struct net *net = sock_net(skb->sk);
 508        struct dn_fib_table *tb;
 509        struct rtmsg *r = nlmsg_data(nlh);
 510        struct nlattr *attrs[RTA_MAX+1];
 511        int err;
 512
 513        if (!netlink_capable(skb, CAP_NET_ADMIN))
 514                return -EPERM;
 515
 516        if (!net_eq(net, &init_net))
 517                return -EINVAL;
 518
 519        err = nlmsg_parse_deprecated(nlh, sizeof(*r), attrs, RTA_MAX,
 520                                     rtm_dn_policy, extack);
 521        if (err < 0)
 522                return err;
 523
 524        tb = dn_fib_get_table(rtm_get_table(attrs, r->rtm_table), 0);
 525        if (!tb)
 526                return -ESRCH;
 527
 528        return tb->delete(tb, r, attrs, nlh, &NETLINK_CB(skb));
 529}
 530
 531static int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
 532                               struct netlink_ext_ack *extack)
 533{
 534        struct net *net = sock_net(skb->sk);
 535        struct dn_fib_table *tb;
 536        struct rtmsg *r = nlmsg_data(nlh);
 537        struct nlattr *attrs[RTA_MAX+1];
 538        int err;
 539
 540        if (!netlink_capable(skb, CAP_NET_ADMIN))
 541                return -EPERM;
 542
 543        if (!net_eq(net, &init_net))
 544                return -EINVAL;
 545
 546        err = nlmsg_parse_deprecated(nlh, sizeof(*r), attrs, RTA_MAX,
 547                                     rtm_dn_policy, extack);
 548        if (err < 0)
 549                return err;
 550
 551        tb = dn_fib_get_table(rtm_get_table(attrs, r->rtm_table), 1);
 552        if (!tb)
 553                return -ENOBUFS;
 554
 555        return tb->insert(tb, r, attrs, nlh, &NETLINK_CB(skb));
 556}
 557
 558static void fib_magic(int cmd, int type, __le16 dst, int dst_len, struct dn_ifaddr *ifa)
 559{
 560        struct dn_fib_table *tb;
 561        struct {
 562                struct nlmsghdr nlh;
 563                struct rtmsg rtm;
 564        } req;
 565        struct {
 566                struct nlattr hdr;
 567                __le16 dst;
 568        } dst_attr = {
 569                .dst = dst,
 570        };
 571        struct {
 572                struct nlattr hdr;
 573                __le16 prefsrc;
 574        } prefsrc_attr = {
 575                .prefsrc = ifa->ifa_local,
 576        };
 577        struct {
 578                struct nlattr hdr;
 579                u32 oif;
 580        } oif_attr = {
 581                .oif = ifa->ifa_dev->dev->ifindex,
 582        };
 583        struct nlattr *attrs[RTA_MAX+1] = {
 584                [RTA_DST] = (struct nlattr *) &dst_attr,
 585                [RTA_PREFSRC] = (struct nlattr * ) &prefsrc_attr,
 586                [RTA_OIF] = (struct nlattr *) &oif_attr,
 587        };
 588
 589        memset(&req.rtm, 0, sizeof(req.rtm));
 590
 591        if (type == RTN_UNICAST)
 592                tb = dn_fib_get_table(RT_MIN_TABLE, 1);
 593        else
 594                tb = dn_fib_get_table(RT_TABLE_LOCAL, 1);
 595
 596        if (tb == NULL)
 597                return;
 598
 599        req.nlh.nlmsg_len = sizeof(req);
 600        req.nlh.nlmsg_type = cmd;
 601        req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND;
 602        req.nlh.nlmsg_pid = 0;
 603        req.nlh.nlmsg_seq = 0;
 604
 605        req.rtm.rtm_dst_len = dst_len;
 606        req.rtm.rtm_table = tb->n;
 607        req.rtm.rtm_protocol = RTPROT_KERNEL;
 608        req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST);
 609        req.rtm.rtm_type = type;
 610
 611        if (cmd == RTM_NEWROUTE)
 612                tb->insert(tb, &req.rtm, attrs, &req.nlh, NULL);
 613        else
 614                tb->delete(tb, &req.rtm, attrs, &req.nlh, NULL);
 615}
 616
 617static void dn_fib_add_ifaddr(struct dn_ifaddr *ifa)
 618{
 619
 620        fib_magic(RTM_NEWROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
 621
 622#if 0
 623        if (!(dev->flags&IFF_UP))
 624                return;
 625        /* In the future, we will want to add default routes here */
 626
 627#endif
 628}
 629
 630static void dn_fib_del_ifaddr(struct dn_ifaddr *ifa)
 631{
 632        int found_it = 0;
 633        struct net_device *dev;
 634        struct dn_dev *dn_db;
 635        struct dn_ifaddr *ifa2;
 636
 637        ASSERT_RTNL();
 638
 639        /* Scan device list */
 640        rcu_read_lock();
 641        for_each_netdev_rcu(&init_net, dev) {
 642                dn_db = rcu_dereference(dev->dn_ptr);
 643                if (dn_db == NULL)
 644                        continue;
 645                for (ifa2 = rcu_dereference(dn_db->ifa_list);
 646                     ifa2 != NULL;
 647                     ifa2 = rcu_dereference(ifa2->ifa_next)) {
 648                        if (ifa2->ifa_local == ifa->ifa_local) {
 649                                found_it = 1;
 650                                break;
 651                        }
 652                }
 653        }
 654        rcu_read_unlock();
 655
 656        if (found_it == 0) {
 657                fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
 658
 659                if (dnet_addr_type(ifa->ifa_local) != RTN_LOCAL) {
 660                        if (dn_fib_sync_down(ifa->ifa_local, NULL, 0))
 661                                dn_fib_flush();
 662                }
 663        }
 664}
 665
 666static void dn_fib_disable_addr(struct net_device *dev, int force)
 667{
 668        if (dn_fib_sync_down(0, dev, force))
 669                dn_fib_flush();
 670        dn_rt_cache_flush(0);
 671        neigh_ifdown(&dn_neigh_table, dev);
 672}
 673
 674static int dn_fib_dnaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
 675{
 676        struct dn_ifaddr *ifa = (struct dn_ifaddr *)ptr;
 677
 678        switch (event) {
 679        case NETDEV_UP:
 680                dn_fib_add_ifaddr(ifa);
 681                dn_fib_sync_up(ifa->ifa_dev->dev);
 682                dn_rt_cache_flush(-1);
 683                break;
 684        case NETDEV_DOWN:
 685                dn_fib_del_ifaddr(ifa);
 686                if (ifa->ifa_dev && ifa->ifa_dev->ifa_list == NULL) {
 687                        dn_fib_disable_addr(ifa->ifa_dev->dev, 1);
 688                } else {
 689                        dn_rt_cache_flush(-1);
 690                }
 691                break;
 692        }
 693        return NOTIFY_DONE;
 694}
 695
 696static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force)
 697{
 698        int ret = 0;
 699        int scope = RT_SCOPE_NOWHERE;
 700
 701        if (force)
 702                scope = -1;
 703
 704        for_fib_info() {
 705                /*
 706                 * This makes no sense for DECnet.... we will almost
 707                 * certainly have more than one local address the same
 708                 * over all our interfaces. It needs thinking about
 709                 * some more.
 710                 */
 711                if (local && fi->fib_prefsrc == local) {
 712                        fi->fib_flags |= RTNH_F_DEAD;
 713                        ret++;
 714                } else if (dev && fi->fib_nhs) {
 715                        int dead = 0;
 716
 717                        change_nexthops(fi) {
 718                                if (nh->nh_flags&RTNH_F_DEAD)
 719                                        dead++;
 720                                else if (nh->nh_dev == dev &&
 721                                                nh->nh_scope != scope) {
 722                                        spin_lock_bh(&dn_fib_multipath_lock);
 723                                        nh->nh_flags |= RTNH_F_DEAD;
 724                                        fi->fib_power -= nh->nh_power;
 725                                        nh->nh_power = 0;
 726                                        spin_unlock_bh(&dn_fib_multipath_lock);
 727                                        dead++;
 728                                }
 729                        } endfor_nexthops(fi)
 730                        if (dead == fi->fib_nhs) {
 731                                fi->fib_flags |= RTNH_F_DEAD;
 732                                ret++;
 733                        }
 734                }
 735        } endfor_fib_info();
 736        return ret;
 737}
 738
 739
 740static int dn_fib_sync_up(struct net_device *dev)
 741{
 742        int ret = 0;
 743
 744        if (!(dev->flags&IFF_UP))
 745                return 0;
 746
 747        for_fib_info() {
 748                int alive = 0;
 749
 750                change_nexthops(fi) {
 751                        if (!(nh->nh_flags&RTNH_F_DEAD)) {
 752                                alive++;
 753                                continue;
 754                        }
 755                        if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP))
 756                                continue;
 757                        if (nh->nh_dev != dev || dev->dn_ptr == NULL)
 758                                continue;
 759                        alive++;
 760                        spin_lock_bh(&dn_fib_multipath_lock);
 761                        nh->nh_power = 0;
 762                        nh->nh_flags &= ~RTNH_F_DEAD;
 763                        spin_unlock_bh(&dn_fib_multipath_lock);
 764                } endfor_nexthops(fi);
 765
 766                if (alive > 0) {
 767                        fi->fib_flags &= ~RTNH_F_DEAD;
 768                        ret++;
 769                }
 770        } endfor_fib_info();
 771        return ret;
 772}
 773
 774static struct notifier_block dn_fib_dnaddr_notifier = {
 775        .notifier_call = dn_fib_dnaddr_event,
 776};
 777
 778void __exit dn_fib_cleanup(void)
 779{
 780        dn_fib_table_cleanup();
 781        dn_fib_rules_cleanup();
 782
 783        unregister_dnaddr_notifier(&dn_fib_dnaddr_notifier);
 784}
 785
 786
 787void __init dn_fib_init(void)
 788{
 789        dn_fib_table_init();
 790        dn_fib_rules_init();
 791
 792        register_dnaddr_notifier(&dn_fib_dnaddr_notifier);
 793
 794        rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_NEWROUTE,
 795                             dn_fib_rtm_newroute, NULL, 0);
 796        rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_DELROUTE,
 797                             dn_fib_rtm_delroute, NULL, 0);
 798}
 799