linux/net/decnet/dn_route.c
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   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 Functions (Endnode and Router)
   7 *
   8 * Authors:     Steve Whitehouse <SteveW@ACM.org>
   9 *              Eduardo Marcelo Serrat <emserrat@geocities.com>
  10 *
  11 * Changes:
  12 *              Steve Whitehouse : Fixes to allow "intra-ethernet" and
  13 *                                 "return-to-sender" bits on outgoing
  14 *                                 packets.
  15 *              Steve Whitehouse : Timeouts for cached routes.
  16 *              Steve Whitehouse : Use dst cache for input routes too.
  17 *              Steve Whitehouse : Fixed error values in dn_send_skb.
  18 *              Steve Whitehouse : Rework routing functions to better fit
  19 *                                 DECnet routing design
  20 *              Alexey Kuznetsov : New SMP locking
  21 *              Steve Whitehouse : More SMP locking changes & dn_cache_dump()
  22 *              Steve Whitehouse : Prerouting NF hook, now really is prerouting.
  23 *                                 Fixed possible skb leak in rtnetlink funcs.
  24 *              Steve Whitehouse : Dave Miller's dynamic hash table sizing and
  25 *                                 Alexey Kuznetsov's finer grained locking
  26 *                                 from ipv4/route.c.
  27 *              Steve Whitehouse : Routing is now starting to look like a
  28 *                                 sensible set of code now, mainly due to
  29 *                                 my copying the IPv4 routing code. The
  30 *                                 hooks here are modified and will continue
  31 *                                 to evolve for a while.
  32 *              Steve Whitehouse : Real SMP at last :-) Also new netfilter
  33 *                                 stuff. Look out raw sockets your days
  34 *                                 are numbered!
  35 *              Steve Whitehouse : Added return-to-sender functions. Added
  36 *                                 backlog congestion level return codes.
  37 *              Steve Whitehouse : Fixed bug where routes were set up with
  38 *                                 no ref count on net devices.
  39 *              Steve Whitehouse : RCU for the route cache
  40 *              Steve Whitehouse : Preparations for the flow cache
  41 *              Steve Whitehouse : Prepare for nonlinear skbs
  42 */
  43
  44/******************************************************************************
  45    (c) 1995-1998 E.M. Serrat           emserrat@geocities.com
  46
  47    This program is free software; you can redistribute it and/or modify
  48    it under the terms of the GNU General Public License as published by
  49    the Free Software Foundation; either version 2 of the License, or
  50    any later version.
  51
  52    This program is distributed in the hope that it will be useful,
  53    but WITHOUT ANY WARRANTY; without even the implied warranty of
  54    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  55    GNU General Public License for more details.
  56*******************************************************************************/
  57
  58#include <linux/errno.h>
  59#include <linux/types.h>
  60#include <linux/socket.h>
  61#include <linux/in.h>
  62#include <linux/kernel.h>
  63#include <linux/sockios.h>
  64#include <linux/net.h>
  65#include <linux/netdevice.h>
  66#include <linux/inet.h>
  67#include <linux/route.h>
  68#include <linux/in_route.h>
  69#include <linux/slab.h>
  70#include <net/sock.h>
  71#include <linux/mm.h>
  72#include <linux/proc_fs.h>
  73#include <linux/seq_file.h>
  74#include <linux/init.h>
  75#include <linux/rtnetlink.h>
  76#include <linux/string.h>
  77#include <linux/netfilter_decnet.h>
  78#include <linux/rcupdate.h>
  79#include <linux/times.h>
  80#include <linux/export.h>
  81#include <asm/errno.h>
  82#include <net/net_namespace.h>
  83#include <net/netlink.h>
  84#include <net/neighbour.h>
  85#include <net/dst.h>
  86#include <net/flow.h>
  87#include <net/fib_rules.h>
  88#include <net/dn.h>
  89#include <net/dn_dev.h>
  90#include <net/dn_nsp.h>
  91#include <net/dn_route.h>
  92#include <net/dn_neigh.h>
  93#include <net/dn_fib.h>
  94
  95struct dn_rt_hash_bucket
  96{
  97        struct dn_route __rcu *chain;
  98        spinlock_t lock;
  99};
 100
 101extern struct neigh_table dn_neigh_table;
 102
 103
 104static unsigned char dn_hiord_addr[6] = {0xAA,0x00,0x04,0x00,0x00,0x00};
 105
 106static const int dn_rt_min_delay = 2 * HZ;
 107static const int dn_rt_max_delay = 10 * HZ;
 108static const int dn_rt_mtu_expires = 10 * 60 * HZ;
 109
 110static unsigned long dn_rt_deadline;
 111
 112static int dn_dst_gc(struct dst_ops *ops);
 113static struct dst_entry *dn_dst_check(struct dst_entry *, __u32);
 114static unsigned int dn_dst_default_advmss(const struct dst_entry *dst);
 115static unsigned int dn_dst_mtu(const struct dst_entry *dst);
 116static void dn_dst_destroy(struct dst_entry *);
 117static void dn_dst_ifdown(struct dst_entry *, struct net_device *dev, int how);
 118static struct dst_entry *dn_dst_negative_advice(struct dst_entry *);
 119static void dn_dst_link_failure(struct sk_buff *);
 120static void dn_dst_update_pmtu(struct dst_entry *dst, struct sock *sk,
 121                               struct sk_buff *skb , u32 mtu);
 122static void dn_dst_redirect(struct dst_entry *dst, struct sock *sk,
 123                            struct sk_buff *skb);
 124static struct neighbour *dn_dst_neigh_lookup(const struct dst_entry *dst,
 125                                             struct sk_buff *skb,
 126                                             const void *daddr);
 127static int dn_route_input(struct sk_buff *);
 128static void dn_run_flush(unsigned long dummy);
 129
 130static struct dn_rt_hash_bucket *dn_rt_hash_table;
 131static unsigned int dn_rt_hash_mask;
 132
 133static struct timer_list dn_route_timer;
 134static DEFINE_TIMER(dn_rt_flush_timer, dn_run_flush, 0, 0);
 135int decnet_dst_gc_interval = 2;
 136
 137static struct dst_ops dn_dst_ops = {
 138        .family =               PF_DECnet,
 139        .protocol =             cpu_to_be16(ETH_P_DNA_RT),
 140        .gc_thresh =            128,
 141        .gc =                   dn_dst_gc,
 142        .check =                dn_dst_check,
 143        .default_advmss =       dn_dst_default_advmss,
 144        .mtu =                  dn_dst_mtu,
 145        .cow_metrics =          dst_cow_metrics_generic,
 146        .destroy =              dn_dst_destroy,
 147        .ifdown =               dn_dst_ifdown,
 148        .negative_advice =      dn_dst_negative_advice,
 149        .link_failure =         dn_dst_link_failure,
 150        .update_pmtu =          dn_dst_update_pmtu,
 151        .redirect =             dn_dst_redirect,
 152        .neigh_lookup =         dn_dst_neigh_lookup,
 153};
 154
 155static void dn_dst_destroy(struct dst_entry *dst)
 156{
 157        struct dn_route *rt = (struct dn_route *) dst;
 158
 159        if (rt->n)
 160                neigh_release(rt->n);
 161        dst_destroy_metrics_generic(dst);
 162}
 163
 164static void dn_dst_ifdown(struct dst_entry *dst, struct net_device *dev, int how)
 165{
 166        if (how) {
 167                struct dn_route *rt = (struct dn_route *) dst;
 168                struct neighbour *n = rt->n;
 169
 170                if (n && n->dev == dev) {
 171                        n->dev = dev_net(dev)->loopback_dev;
 172                        dev_hold(n->dev);
 173                        dev_put(dev);
 174                }
 175        }
 176}
 177
 178static __inline__ unsigned int dn_hash(__le16 src, __le16 dst)
 179{
 180        __u16 tmp = (__u16 __force)(src ^ dst);
 181        tmp ^= (tmp >> 3);
 182        tmp ^= (tmp >> 5);
 183        tmp ^= (tmp >> 10);
 184        return dn_rt_hash_mask & (unsigned int)tmp;
 185}
 186
 187static inline void dnrt_free(struct dn_route *rt)
 188{
 189        call_rcu_bh(&rt->dst.rcu_head, dst_rcu_free);
 190}
 191
 192static inline void dnrt_drop(struct dn_route *rt)
 193{
 194        dst_release(&rt->dst);
 195        call_rcu_bh(&rt->dst.rcu_head, dst_rcu_free);
 196}
 197
 198static void dn_dst_check_expire(unsigned long dummy)
 199{
 200        int i;
 201        struct dn_route *rt;
 202        struct dn_route __rcu **rtp;
 203        unsigned long now = jiffies;
 204        unsigned long expire = 120 * HZ;
 205
 206        for (i = 0; i <= dn_rt_hash_mask; i++) {
 207                rtp = &dn_rt_hash_table[i].chain;
 208
 209                spin_lock(&dn_rt_hash_table[i].lock);
 210                while ((rt = rcu_dereference_protected(*rtp,
 211                                                lockdep_is_held(&dn_rt_hash_table[i].lock))) != NULL) {
 212                        if (atomic_read(&rt->dst.__refcnt) ||
 213                                        (now - rt->dst.lastuse) < expire) {
 214                                rtp = &rt->dst.dn_next;
 215                                continue;
 216                        }
 217                        *rtp = rt->dst.dn_next;
 218                        rt->dst.dn_next = NULL;
 219                        dnrt_free(rt);
 220                }
 221                spin_unlock(&dn_rt_hash_table[i].lock);
 222
 223                if ((jiffies - now) > 0)
 224                        break;
 225        }
 226
 227        mod_timer(&dn_route_timer, now + decnet_dst_gc_interval * HZ);
 228}
 229
 230static int dn_dst_gc(struct dst_ops *ops)
 231{
 232        struct dn_route *rt;
 233        struct dn_route __rcu **rtp;
 234        int i;
 235        unsigned long now = jiffies;
 236        unsigned long expire = 10 * HZ;
 237
 238        for (i = 0; i <= dn_rt_hash_mask; i++) {
 239
 240                spin_lock_bh(&dn_rt_hash_table[i].lock);
 241                rtp = &dn_rt_hash_table[i].chain;
 242
 243                while ((rt = rcu_dereference_protected(*rtp,
 244                                                lockdep_is_held(&dn_rt_hash_table[i].lock))) != NULL) {
 245                        if (atomic_read(&rt->dst.__refcnt) ||
 246                                        (now - rt->dst.lastuse) < expire) {
 247                                rtp = &rt->dst.dn_next;
 248                                continue;
 249                        }
 250                        *rtp = rt->dst.dn_next;
 251                        rt->dst.dn_next = NULL;
 252                        dnrt_drop(rt);
 253                        break;
 254                }
 255                spin_unlock_bh(&dn_rt_hash_table[i].lock);
 256        }
 257
 258        return 0;
 259}
 260
 261/*
 262 * The decnet standards don't impose a particular minimum mtu, what they
 263 * do insist on is that the routing layer accepts a datagram of at least
 264 * 230 bytes long. Here we have to subtract the routing header length from
 265 * 230 to get the minimum acceptable mtu. If there is no neighbour, then we
 266 * assume the worst and use a long header size.
 267 *
 268 * We update both the mtu and the advertised mss (i.e. the segment size we
 269 * advertise to the other end).
 270 */
 271static void dn_dst_update_pmtu(struct dst_entry *dst, struct sock *sk,
 272                               struct sk_buff *skb, u32 mtu)
 273{
 274        struct dn_route *rt = (struct dn_route *) dst;
 275        struct neighbour *n = rt->n;
 276        u32 min_mtu = 230;
 277        struct dn_dev *dn;
 278
 279        dn = n ? rcu_dereference_raw(n->dev->dn_ptr) : NULL;
 280
 281        if (dn && dn->use_long == 0)
 282                min_mtu -= 6;
 283        else
 284                min_mtu -= 21;
 285
 286        if (dst_metric(dst, RTAX_MTU) > mtu && mtu >= min_mtu) {
 287                if (!(dst_metric_locked(dst, RTAX_MTU))) {
 288                        dst_metric_set(dst, RTAX_MTU, mtu);
 289                        dst_set_expires(dst, dn_rt_mtu_expires);
 290                }
 291                if (!(dst_metric_locked(dst, RTAX_ADVMSS))) {
 292                        u32 mss = mtu - DN_MAX_NSP_DATA_HEADER;
 293                        u32 existing_mss = dst_metric_raw(dst, RTAX_ADVMSS);
 294                        if (!existing_mss || existing_mss > mss)
 295                                dst_metric_set(dst, RTAX_ADVMSS, mss);
 296                }
 297        }
 298}
 299
 300static void dn_dst_redirect(struct dst_entry *dst, struct sock *sk,
 301                            struct sk_buff *skb)
 302{
 303}
 304
 305/*
 306 * When a route has been marked obsolete. (e.g. routing cache flush)
 307 */
 308static struct dst_entry *dn_dst_check(struct dst_entry *dst, __u32 cookie)
 309{
 310        return NULL;
 311}
 312
 313static struct dst_entry *dn_dst_negative_advice(struct dst_entry *dst)
 314{
 315        dst_release(dst);
 316        return NULL;
 317}
 318
 319static void dn_dst_link_failure(struct sk_buff *skb)
 320{
 321}
 322
 323static inline int compare_keys(struct flowidn *fl1, struct flowidn *fl2)
 324{
 325        return ((fl1->daddr ^ fl2->daddr) |
 326                (fl1->saddr ^ fl2->saddr) |
 327                (fl1->flowidn_mark ^ fl2->flowidn_mark) |
 328                (fl1->flowidn_scope ^ fl2->flowidn_scope) |
 329                (fl1->flowidn_oif ^ fl2->flowidn_oif) |
 330                (fl1->flowidn_iif ^ fl2->flowidn_iif)) == 0;
 331}
 332
 333static int dn_insert_route(struct dn_route *rt, unsigned int hash, struct dn_route **rp)
 334{
 335        struct dn_route *rth;
 336        struct dn_route __rcu **rthp;
 337        unsigned long now = jiffies;
 338
 339        rthp = &dn_rt_hash_table[hash].chain;
 340
 341        spin_lock_bh(&dn_rt_hash_table[hash].lock);
 342        while ((rth = rcu_dereference_protected(*rthp,
 343                                                lockdep_is_held(&dn_rt_hash_table[hash].lock))) != NULL) {
 344                if (compare_keys(&rth->fld, &rt->fld)) {
 345                        /* Put it first */
 346                        *rthp = rth->dst.dn_next;
 347                        rcu_assign_pointer(rth->dst.dn_next,
 348                                           dn_rt_hash_table[hash].chain);
 349                        rcu_assign_pointer(dn_rt_hash_table[hash].chain, rth);
 350
 351                        dst_use(&rth->dst, now);
 352                        spin_unlock_bh(&dn_rt_hash_table[hash].lock);
 353
 354                        dnrt_drop(rt);
 355                        *rp = rth;
 356                        return 0;
 357                }
 358                rthp = &rth->dst.dn_next;
 359        }
 360
 361        rcu_assign_pointer(rt->dst.dn_next, dn_rt_hash_table[hash].chain);
 362        rcu_assign_pointer(dn_rt_hash_table[hash].chain, rt);
 363
 364        dst_use(&rt->dst, now);
 365        spin_unlock_bh(&dn_rt_hash_table[hash].lock);
 366        *rp = rt;
 367        return 0;
 368}
 369
 370static void dn_run_flush(unsigned long dummy)
 371{
 372        int i;
 373        struct dn_route *rt, *next;
 374
 375        for (i = 0; i < dn_rt_hash_mask; i++) {
 376                spin_lock_bh(&dn_rt_hash_table[i].lock);
 377
 378                if ((rt = xchg((struct dn_route **)&dn_rt_hash_table[i].chain, NULL)) == NULL)
 379                        goto nothing_to_declare;
 380
 381                for(; rt; rt = next) {
 382                        next = rcu_dereference_raw(rt->dst.dn_next);
 383                        RCU_INIT_POINTER(rt->dst.dn_next, NULL);
 384                        dst_free((struct dst_entry *)rt);
 385                }
 386
 387nothing_to_declare:
 388                spin_unlock_bh(&dn_rt_hash_table[i].lock);
 389        }
 390}
 391
 392static DEFINE_SPINLOCK(dn_rt_flush_lock);
 393
 394void dn_rt_cache_flush(int delay)
 395{
 396        unsigned long now = jiffies;
 397        int user_mode = !in_interrupt();
 398
 399        if (delay < 0)
 400                delay = dn_rt_min_delay;
 401
 402        spin_lock_bh(&dn_rt_flush_lock);
 403
 404        if (del_timer(&dn_rt_flush_timer) && delay > 0 && dn_rt_deadline) {
 405                long tmo = (long)(dn_rt_deadline - now);
 406
 407                if (user_mode && tmo < dn_rt_max_delay - dn_rt_min_delay)
 408                        tmo = 0;
 409
 410                if (delay > tmo)
 411                        delay = tmo;
 412        }
 413
 414        if (delay <= 0) {
 415                spin_unlock_bh(&dn_rt_flush_lock);
 416                dn_run_flush(0);
 417                return;
 418        }
 419
 420        if (dn_rt_deadline == 0)
 421                dn_rt_deadline = now + dn_rt_max_delay;
 422
 423        dn_rt_flush_timer.expires = now + delay;
 424        add_timer(&dn_rt_flush_timer);
 425        spin_unlock_bh(&dn_rt_flush_lock);
 426}
 427
 428/**
 429 * dn_return_short - Return a short packet to its sender
 430 * @skb: The packet to return
 431 *
 432 */
 433static int dn_return_short(struct sk_buff *skb)
 434{
 435        struct dn_skb_cb *cb;
 436        unsigned char *ptr;
 437        __le16 *src;
 438        __le16 *dst;
 439
 440        /* Add back headers */
 441        skb_push(skb, skb->data - skb_network_header(skb));
 442
 443        if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL)
 444                return NET_RX_DROP;
 445
 446        cb = DN_SKB_CB(skb);
 447        /* Skip packet length and point to flags */
 448        ptr = skb->data + 2;
 449        *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS;
 450
 451        dst = (__le16 *)ptr;
 452        ptr += 2;
 453        src = (__le16 *)ptr;
 454        ptr += 2;
 455        *ptr = 0; /* Zero hop count */
 456
 457        swap(*src, *dst);
 458
 459        skb->pkt_type = PACKET_OUTGOING;
 460        dn_rt_finish_output(skb, NULL, NULL);
 461        return NET_RX_SUCCESS;
 462}
 463
 464/**
 465 * dn_return_long - Return a long packet to its sender
 466 * @skb: The long format packet to return
 467 *
 468 */
 469static int dn_return_long(struct sk_buff *skb)
 470{
 471        struct dn_skb_cb *cb;
 472        unsigned char *ptr;
 473        unsigned char *src_addr, *dst_addr;
 474        unsigned char tmp[ETH_ALEN];
 475
 476        /* Add back all headers */
 477        skb_push(skb, skb->data - skb_network_header(skb));
 478
 479        if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL)
 480                return NET_RX_DROP;
 481
 482        cb = DN_SKB_CB(skb);
 483        /* Ignore packet length and point to flags */
 484        ptr = skb->data + 2;
 485
 486        /* Skip padding */
 487        if (*ptr & DN_RT_F_PF) {
 488                char padlen = (*ptr & ~DN_RT_F_PF);
 489                ptr += padlen;
 490        }
 491
 492        *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS;
 493        ptr += 2;
 494        dst_addr = ptr;
 495        ptr += 8;
 496        src_addr = ptr;
 497        ptr += 6;
 498        *ptr = 0; /* Zero hop count */
 499
 500        /* Swap source and destination */
 501        memcpy(tmp, src_addr, ETH_ALEN);
 502        memcpy(src_addr, dst_addr, ETH_ALEN);
 503        memcpy(dst_addr, tmp, ETH_ALEN);
 504
 505        skb->pkt_type = PACKET_OUTGOING;
 506        dn_rt_finish_output(skb, dst_addr, src_addr);
 507        return NET_RX_SUCCESS;
 508}
 509
 510/**
 511 * dn_route_rx_packet - Try and find a route for an incoming packet
 512 * @skb: The packet to find a route for
 513 *
 514 * Returns: result of input function if route is found, error code otherwise
 515 */
 516static int dn_route_rx_packet(struct sk_buff *skb)
 517{
 518        struct dn_skb_cb *cb;
 519        int err;
 520
 521        if ((err = dn_route_input(skb)) == 0)
 522                return dst_input(skb);
 523
 524        cb = DN_SKB_CB(skb);
 525        if (decnet_debug_level & 4) {
 526                char *devname = skb->dev ? skb->dev->name : "???";
 527
 528                printk(KERN_DEBUG
 529                        "DECnet: dn_route_rx_packet: rt_flags=0x%02x dev=%s len=%d src=0x%04hx dst=0x%04hx err=%d type=%d\n",
 530                        (int)cb->rt_flags, devname, skb->len,
 531                        le16_to_cpu(cb->src), le16_to_cpu(cb->dst),
 532                        err, skb->pkt_type);
 533        }
 534
 535        if ((skb->pkt_type == PACKET_HOST) && (cb->rt_flags & DN_RT_F_RQR)) {
 536                switch (cb->rt_flags & DN_RT_PKT_MSK) {
 537                case DN_RT_PKT_SHORT:
 538                        return dn_return_short(skb);
 539                case DN_RT_PKT_LONG:
 540                        return dn_return_long(skb);
 541                }
 542        }
 543
 544        kfree_skb(skb);
 545        return NET_RX_DROP;
 546}
 547
 548static int dn_route_rx_long(struct sk_buff *skb)
 549{
 550        struct dn_skb_cb *cb = DN_SKB_CB(skb);
 551        unsigned char *ptr = skb->data;
 552
 553        if (!pskb_may_pull(skb, 21)) /* 20 for long header, 1 for shortest nsp */
 554                goto drop_it;
 555
 556        skb_pull(skb, 20);
 557        skb_reset_transport_header(skb);
 558
 559        /* Destination info */
 560        ptr += 2;
 561        cb->dst = dn_eth2dn(ptr);
 562        if (memcmp(ptr, dn_hiord_addr, 4) != 0)
 563                goto drop_it;
 564        ptr += 6;
 565
 566
 567        /* Source info */
 568        ptr += 2;
 569        cb->src = dn_eth2dn(ptr);
 570        if (memcmp(ptr, dn_hiord_addr, 4) != 0)
 571                goto drop_it;
 572        ptr += 6;
 573        /* Other junk */
 574        ptr++;
 575        cb->hops = *ptr++; /* Visit Count */
 576
 577        return NF_HOOK(NFPROTO_DECNET, NF_DN_PRE_ROUTING, skb, skb->dev, NULL,
 578                       dn_route_rx_packet);
 579
 580drop_it:
 581        kfree_skb(skb);
 582        return NET_RX_DROP;
 583}
 584
 585
 586
 587static int dn_route_rx_short(struct sk_buff *skb)
 588{
 589        struct dn_skb_cb *cb = DN_SKB_CB(skb);
 590        unsigned char *ptr = skb->data;
 591
 592        if (!pskb_may_pull(skb, 6)) /* 5 for short header + 1 for shortest nsp */
 593                goto drop_it;
 594
 595        skb_pull(skb, 5);
 596        skb_reset_transport_header(skb);
 597
 598        cb->dst = *(__le16 *)ptr;
 599        ptr += 2;
 600        cb->src = *(__le16 *)ptr;
 601        ptr += 2;
 602        cb->hops = *ptr & 0x3f;
 603
 604        return NF_HOOK(NFPROTO_DECNET, NF_DN_PRE_ROUTING, skb, skb->dev, NULL,
 605                       dn_route_rx_packet);
 606
 607drop_it:
 608        kfree_skb(skb);
 609        return NET_RX_DROP;
 610}
 611
 612static int dn_route_discard(struct sk_buff *skb)
 613{
 614        /*
 615         * I know we drop the packet here, but thats considered success in
 616         * this case
 617         */
 618        kfree_skb(skb);
 619        return NET_RX_SUCCESS;
 620}
 621
 622static int dn_route_ptp_hello(struct sk_buff *skb)
 623{
 624        dn_dev_hello(skb);
 625        dn_neigh_pointopoint_hello(skb);
 626        return NET_RX_SUCCESS;
 627}
 628
 629int dn_route_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
 630{
 631        struct dn_skb_cb *cb;
 632        unsigned char flags = 0;
 633        __u16 len = le16_to_cpu(*(__le16 *)skb->data);
 634        struct dn_dev *dn = rcu_dereference(dev->dn_ptr);
 635        unsigned char padlen = 0;
 636
 637        if (!net_eq(dev_net(dev), &init_net))
 638                goto dump_it;
 639
 640        if (dn == NULL)
 641                goto dump_it;
 642
 643        if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
 644                goto out;
 645
 646        if (!pskb_may_pull(skb, 3))
 647                goto dump_it;
 648
 649        skb_pull(skb, 2);
 650
 651        if (len > skb->len)
 652                goto dump_it;
 653
 654        skb_trim(skb, len);
 655
 656        flags = *skb->data;
 657
 658        cb = DN_SKB_CB(skb);
 659        cb->stamp = jiffies;
 660        cb->iif = dev->ifindex;
 661
 662        /*
 663         * If we have padding, remove it.
 664         */
 665        if (flags & DN_RT_F_PF) {
 666                padlen = flags & ~DN_RT_F_PF;
 667                if (!pskb_may_pull(skb, padlen + 1))
 668                        goto dump_it;
 669                skb_pull(skb, padlen);
 670                flags = *skb->data;
 671        }
 672
 673        skb_reset_network_header(skb);
 674
 675        /*
 676         * Weed out future version DECnet
 677         */
 678        if (flags & DN_RT_F_VER)
 679                goto dump_it;
 680
 681        cb->rt_flags = flags;
 682
 683        if (decnet_debug_level & 1)
 684                printk(KERN_DEBUG
 685                        "dn_route_rcv: got 0x%02x from %s [%d %d %d]\n",
 686                        (int)flags, (dev) ? dev->name : "???", len, skb->len,
 687                        padlen);
 688
 689        if (flags & DN_RT_PKT_CNTL) {
 690                if (unlikely(skb_linearize(skb)))
 691                        goto dump_it;
 692
 693                switch (flags & DN_RT_CNTL_MSK) {
 694                case DN_RT_PKT_INIT:
 695                        dn_dev_init_pkt(skb);
 696                        break;
 697                case DN_RT_PKT_VERI:
 698                        dn_dev_veri_pkt(skb);
 699                        break;
 700                }
 701
 702                if (dn->parms.state != DN_DEV_S_RU)
 703                        goto dump_it;
 704
 705                switch (flags & DN_RT_CNTL_MSK) {
 706                case DN_RT_PKT_HELO:
 707                        return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO,
 708                                       skb, skb->dev, NULL,
 709                                       dn_route_ptp_hello);
 710
 711                case DN_RT_PKT_L1RT:
 712                case DN_RT_PKT_L2RT:
 713                        return NF_HOOK(NFPROTO_DECNET, NF_DN_ROUTE,
 714                                       skb, skb->dev, NULL,
 715                                       dn_route_discard);
 716                case DN_RT_PKT_ERTH:
 717                        return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO,
 718                                       skb, skb->dev, NULL,
 719                                       dn_neigh_router_hello);
 720
 721                case DN_RT_PKT_EEDH:
 722                        return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO,
 723                                       skb, skb->dev, NULL,
 724                                       dn_neigh_endnode_hello);
 725                }
 726        } else {
 727                if (dn->parms.state != DN_DEV_S_RU)
 728                        goto dump_it;
 729
 730                skb_pull(skb, 1); /* Pull flags */
 731
 732                switch (flags & DN_RT_PKT_MSK) {
 733                case DN_RT_PKT_LONG:
 734                        return dn_route_rx_long(skb);
 735                case DN_RT_PKT_SHORT:
 736                        return dn_route_rx_short(skb);
 737                }
 738        }
 739
 740dump_it:
 741        kfree_skb(skb);
 742out:
 743        return NET_RX_DROP;
 744}
 745
 746static int dn_to_neigh_output(struct sk_buff *skb)
 747{
 748        struct dst_entry *dst = skb_dst(skb);
 749        struct dn_route *rt = (struct dn_route *) dst;
 750        struct neighbour *n = rt->n;
 751
 752        return n->output(n, skb);
 753}
 754
 755static int dn_output(struct sk_buff *skb)
 756{
 757        struct dst_entry *dst = skb_dst(skb);
 758        struct dn_route *rt = (struct dn_route *)dst;
 759        struct net_device *dev = dst->dev;
 760        struct dn_skb_cb *cb = DN_SKB_CB(skb);
 761
 762        int err = -EINVAL;
 763
 764        if (rt->n == NULL)
 765                goto error;
 766
 767        skb->dev = dev;
 768
 769        cb->src = rt->rt_saddr;
 770        cb->dst = rt->rt_daddr;
 771
 772        /*
 773         * Always set the Intra-Ethernet bit on all outgoing packets
 774         * originated on this node. Only valid flag from upper layers
 775         * is return-to-sender-requested. Set hop count to 0 too.
 776         */
 777        cb->rt_flags &= ~DN_RT_F_RQR;
 778        cb->rt_flags |= DN_RT_F_IE;
 779        cb->hops = 0;
 780
 781        return NF_HOOK(NFPROTO_DECNET, NF_DN_LOCAL_OUT, skb, NULL, dev,
 782                       dn_to_neigh_output);
 783
 784error:
 785        net_dbg_ratelimited("dn_output: This should not happen\n");
 786
 787        kfree_skb(skb);
 788
 789        return err;
 790}
 791
 792static int dn_forward(struct sk_buff *skb)
 793{
 794        struct dn_skb_cb *cb = DN_SKB_CB(skb);
 795        struct dst_entry *dst = skb_dst(skb);
 796        struct dn_dev *dn_db = rcu_dereference(dst->dev->dn_ptr);
 797        struct dn_route *rt;
 798        int header_len;
 799#ifdef CONFIG_NETFILTER
 800        struct net_device *dev = skb->dev;
 801#endif
 802
 803        if (skb->pkt_type != PACKET_HOST)
 804                goto drop;
 805
 806        /* Ensure that we have enough space for headers */
 807        rt = (struct dn_route *)skb_dst(skb);
 808        header_len = dn_db->use_long ? 21 : 6;
 809        if (skb_cow(skb, LL_RESERVED_SPACE(rt->dst.dev)+header_len))
 810                goto drop;
 811
 812        /*
 813         * Hop count exceeded.
 814         */
 815        if (++cb->hops > 30)
 816                goto drop;
 817
 818        skb->dev = rt->dst.dev;
 819
 820        /*
 821         * If packet goes out same interface it came in on, then set
 822         * the Intra-Ethernet bit. This has no effect for short
 823         * packets, so we don't need to test for them here.
 824         */
 825        cb->rt_flags &= ~DN_RT_F_IE;
 826        if (rt->rt_flags & RTCF_DOREDIRECT)
 827                cb->rt_flags |= DN_RT_F_IE;
 828
 829        return NF_HOOK(NFPROTO_DECNET, NF_DN_FORWARD, skb, dev, skb->dev,
 830                       dn_to_neigh_output);
 831
 832drop:
 833        kfree_skb(skb);
 834        return NET_RX_DROP;
 835}
 836
 837/*
 838 * Used to catch bugs. This should never normally get
 839 * called.
 840 */
 841static int dn_rt_bug(struct sk_buff *skb)
 842{
 843        struct dn_skb_cb *cb = DN_SKB_CB(skb);
 844
 845        net_dbg_ratelimited("dn_rt_bug: skb from:%04x to:%04x\n",
 846                            le16_to_cpu(cb->src), le16_to_cpu(cb->dst));
 847
 848        kfree_skb(skb);
 849
 850        return NET_RX_DROP;
 851}
 852
 853static unsigned int dn_dst_default_advmss(const struct dst_entry *dst)
 854{
 855        return dn_mss_from_pmtu(dst->dev, dst_mtu(dst));
 856}
 857
 858static unsigned int dn_dst_mtu(const struct dst_entry *dst)
 859{
 860        unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
 861
 862        return mtu ? : dst->dev->mtu;
 863}
 864
 865static struct neighbour *dn_dst_neigh_lookup(const struct dst_entry *dst,
 866                                             struct sk_buff *skb,
 867                                             const void *daddr)
 868{
 869        return __neigh_lookup_errno(&dn_neigh_table, daddr, dst->dev);
 870}
 871
 872static int dn_rt_set_next_hop(struct dn_route *rt, struct dn_fib_res *res)
 873{
 874        struct dn_fib_info *fi = res->fi;
 875        struct net_device *dev = rt->dst.dev;
 876        unsigned int mss_metric;
 877        struct neighbour *n;
 878
 879        if (fi) {
 880                if (DN_FIB_RES_GW(*res) &&
 881                    DN_FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK)
 882                        rt->rt_gateway = DN_FIB_RES_GW(*res);
 883                dst_init_metrics(&rt->dst, fi->fib_metrics, true);
 884        }
 885        rt->rt_type = res->type;
 886
 887        if (dev != NULL && rt->n == NULL) {
 888                n = __neigh_lookup_errno(&dn_neigh_table, &rt->rt_gateway, dev);
 889                if (IS_ERR(n))
 890                        return PTR_ERR(n);
 891                rt->n = n;
 892        }
 893
 894        if (dst_metric(&rt->dst, RTAX_MTU) > rt->dst.dev->mtu)
 895                dst_metric_set(&rt->dst, RTAX_MTU, rt->dst.dev->mtu);
 896        mss_metric = dst_metric_raw(&rt->dst, RTAX_ADVMSS);
 897        if (mss_metric) {
 898                unsigned int mss = dn_mss_from_pmtu(dev, dst_mtu(&rt->dst));
 899                if (mss_metric > mss)
 900                        dst_metric_set(&rt->dst, RTAX_ADVMSS, mss);
 901        }
 902        return 0;
 903}
 904
 905static inline int dn_match_addr(__le16 addr1, __le16 addr2)
 906{
 907        __u16 tmp = le16_to_cpu(addr1) ^ le16_to_cpu(addr2);
 908        int match = 16;
 909        while(tmp) {
 910                tmp >>= 1;
 911                match--;
 912        }
 913        return match;
 914}
 915
 916static __le16 dnet_select_source(const struct net_device *dev, __le16 daddr, int scope)
 917{
 918        __le16 saddr = 0;
 919        struct dn_dev *dn_db;
 920        struct dn_ifaddr *ifa;
 921        int best_match = 0;
 922        int ret;
 923
 924        rcu_read_lock();
 925        dn_db = rcu_dereference(dev->dn_ptr);
 926        for (ifa = rcu_dereference(dn_db->ifa_list);
 927             ifa != NULL;
 928             ifa = rcu_dereference(ifa->ifa_next)) {
 929                if (ifa->ifa_scope > scope)
 930                        continue;
 931                if (!daddr) {
 932                        saddr = ifa->ifa_local;
 933                        break;
 934                }
 935                ret = dn_match_addr(daddr, ifa->ifa_local);
 936                if (ret > best_match)
 937                        saddr = ifa->ifa_local;
 938                if (best_match == 0)
 939                        saddr = ifa->ifa_local;
 940        }
 941        rcu_read_unlock();
 942
 943        return saddr;
 944}
 945
 946static inline __le16 __dn_fib_res_prefsrc(struct dn_fib_res *res)
 947{
 948        return dnet_select_source(DN_FIB_RES_DEV(*res), DN_FIB_RES_GW(*res), res->scope);
 949}
 950
 951static inline __le16 dn_fib_rules_map_destination(__le16 daddr, struct dn_fib_res *res)
 952{
 953        __le16 mask = dnet_make_mask(res->prefixlen);
 954        return (daddr&~mask)|res->fi->fib_nh->nh_gw;
 955}
 956
 957static int dn_route_output_slow(struct dst_entry **pprt, const struct flowidn *oldflp, int try_hard)
 958{
 959        struct flowidn fld = {
 960                .daddr = oldflp->daddr,
 961                .saddr = oldflp->saddr,
 962                .flowidn_scope = RT_SCOPE_UNIVERSE,
 963                .flowidn_mark = oldflp->flowidn_mark,
 964                .flowidn_iif = LOOPBACK_IFINDEX,
 965                .flowidn_oif = oldflp->flowidn_oif,
 966        };
 967        struct dn_route *rt = NULL;
 968        struct net_device *dev_out = NULL, *dev;
 969        struct neighbour *neigh = NULL;
 970        unsigned int hash;
 971        unsigned int flags = 0;
 972        struct dn_fib_res res = { .fi = NULL, .type = RTN_UNICAST };
 973        int err;
 974        int free_res = 0;
 975        __le16 gateway = 0;
 976
 977        if (decnet_debug_level & 16)
 978                printk(KERN_DEBUG
 979                       "dn_route_output_slow: dst=%04x src=%04x mark=%d"
 980                       " iif=%d oif=%d\n", le16_to_cpu(oldflp->daddr),
 981                       le16_to_cpu(oldflp->saddr),
 982                       oldflp->flowidn_mark, LOOPBACK_IFINDEX,
 983                       oldflp->flowidn_oif);
 984
 985        /* If we have an output interface, verify its a DECnet device */
 986        if (oldflp->flowidn_oif) {
 987                dev_out = dev_get_by_index(&init_net, oldflp->flowidn_oif);
 988                err = -ENODEV;
 989                if (dev_out && dev_out->dn_ptr == NULL) {
 990                        dev_put(dev_out);
 991                        dev_out = NULL;
 992                }
 993                if (dev_out == NULL)
 994                        goto out;
 995        }
 996
 997        /* If we have a source address, verify that its a local address */
 998        if (oldflp->saddr) {
 999                err = -EADDRNOTAVAIL;
1000
1001                if (dev_out) {
1002                        if (dn_dev_islocal(dev_out, oldflp->saddr))
1003                                goto source_ok;
1004                        dev_put(dev_out);
1005                        goto out;
1006                }
1007                rcu_read_lock();
1008                for_each_netdev_rcu(&init_net, dev) {
1009                        if (!dev->dn_ptr)
1010                                continue;
1011                        if (!dn_dev_islocal(dev, oldflp->saddr))
1012                                continue;
1013                        if ((dev->flags & IFF_LOOPBACK) &&
1014                            oldflp->daddr &&
1015                            !dn_dev_islocal(dev, oldflp->daddr))
1016                                continue;
1017
1018                        dev_out = dev;
1019                        break;
1020                }
1021                rcu_read_unlock();
1022                if (dev_out == NULL)
1023                        goto out;
1024                dev_hold(dev_out);
1025source_ok:
1026                ;
1027        }
1028
1029        /* No destination? Assume its local */
1030        if (!fld.daddr) {
1031                fld.daddr = fld.saddr;
1032
1033                err = -EADDRNOTAVAIL;
1034                if (dev_out)
1035                        dev_put(dev_out);
1036                dev_out = init_net.loopback_dev;
1037                dev_hold(dev_out);
1038                if (!fld.daddr) {
1039                        fld.daddr =
1040                        fld.saddr = dnet_select_source(dev_out, 0,
1041                                                       RT_SCOPE_HOST);
1042                        if (!fld.daddr)
1043                                goto out;
1044                }
1045                fld.flowidn_oif = LOOPBACK_IFINDEX;
1046                res.type = RTN_LOCAL;
1047                goto make_route;
1048        }
1049
1050        if (decnet_debug_level & 16)
1051                printk(KERN_DEBUG
1052                       "dn_route_output_slow: initial checks complete."
1053                       " dst=%o4x src=%04x oif=%d try_hard=%d\n",
1054                       le16_to_cpu(fld.daddr), le16_to_cpu(fld.saddr),
1055                       fld.flowidn_oif, try_hard);
1056
1057        /*
1058         * N.B. If the kernel is compiled without router support then
1059         * dn_fib_lookup() will evaluate to non-zero so this if () block
1060         * will always be executed.
1061         */
1062        err = -ESRCH;
1063        if (try_hard || (err = dn_fib_lookup(&fld, &res)) != 0) {
1064                struct dn_dev *dn_db;
1065                if (err != -ESRCH)
1066                        goto out;
1067                /*
1068                 * Here the fallback is basically the standard algorithm for
1069                 * routing in endnodes which is described in the DECnet routing
1070                 * docs
1071                 *
1072                 * If we are not trying hard, look in neighbour cache.
1073                 * The result is tested to ensure that if a specific output
1074                 * device/source address was requested, then we honour that
1075                 * here
1076                 */
1077                if (!try_hard) {
1078                        neigh = neigh_lookup_nodev(&dn_neigh_table, &init_net, &fld.daddr);
1079                        if (neigh) {
1080                                if ((oldflp->flowidn_oif &&
1081                                    (neigh->dev->ifindex != oldflp->flowidn_oif)) ||
1082                                    (oldflp->saddr &&
1083                                    (!dn_dev_islocal(neigh->dev,
1084                                                     oldflp->saddr)))) {
1085                                        neigh_release(neigh);
1086                                        neigh = NULL;
1087                                } else {
1088                                        if (dev_out)
1089                                                dev_put(dev_out);
1090                                        if (dn_dev_islocal(neigh->dev, fld.daddr)) {
1091                                                dev_out = init_net.loopback_dev;
1092                                                res.type = RTN_LOCAL;
1093                                        } else {
1094                                                dev_out = neigh->dev;
1095                                        }
1096                                        dev_hold(dev_out);
1097                                        goto select_source;
1098                                }
1099                        }
1100                }
1101
1102                /* Not there? Perhaps its a local address */
1103                if (dev_out == NULL)
1104                        dev_out = dn_dev_get_default();
1105                err = -ENODEV;
1106                if (dev_out == NULL)
1107                        goto out;
1108                dn_db = rcu_dereference_raw(dev_out->dn_ptr);
1109                /* Possible improvement - check all devices for local addr */
1110                if (dn_dev_islocal(dev_out, fld.daddr)) {
1111                        dev_put(dev_out);
1112                        dev_out = init_net.loopback_dev;
1113                        dev_hold(dev_out);
1114                        res.type = RTN_LOCAL;
1115                        goto select_source;
1116                }
1117                /* Not local either.... try sending it to the default router */
1118                neigh = neigh_clone(dn_db->router);
1119                BUG_ON(neigh && neigh->dev != dev_out);
1120
1121                /* Ok then, we assume its directly connected and move on */
1122select_source:
1123                if (neigh)
1124                        gateway = ((struct dn_neigh *)neigh)->addr;
1125                if (gateway == 0)
1126                        gateway = fld.daddr;
1127                if (fld.saddr == 0) {
1128                        fld.saddr = dnet_select_source(dev_out, gateway,
1129                                                       res.type == RTN_LOCAL ?
1130                                                       RT_SCOPE_HOST :
1131                                                       RT_SCOPE_LINK);
1132                        if (fld.saddr == 0 && res.type != RTN_LOCAL)
1133                                goto e_addr;
1134                }
1135                fld.flowidn_oif = dev_out->ifindex;
1136                goto make_route;
1137        }
1138        free_res = 1;
1139
1140        if (res.type == RTN_NAT)
1141                goto e_inval;
1142
1143        if (res.type == RTN_LOCAL) {
1144                if (!fld.saddr)
1145                        fld.saddr = fld.daddr;
1146                if (dev_out)
1147                        dev_put(dev_out);
1148                dev_out = init_net.loopback_dev;
1149                dev_hold(dev_out);
1150                fld.flowidn_oif = dev_out->ifindex;
1151                if (res.fi)
1152                        dn_fib_info_put(res.fi);
1153                res.fi = NULL;
1154                goto make_route;
1155        }
1156
1157        if (res.fi->fib_nhs > 1 && fld.flowidn_oif == 0)
1158                dn_fib_select_multipath(&fld, &res);
1159
1160        /*
1161         * We could add some logic to deal with default routes here and
1162         * get rid of some of the special casing above.
1163         */
1164
1165        if (!fld.saddr)
1166                fld.saddr = DN_FIB_RES_PREFSRC(res);
1167
1168        if (dev_out)
1169                dev_put(dev_out);
1170        dev_out = DN_FIB_RES_DEV(res);
1171        dev_hold(dev_out);
1172        fld.flowidn_oif = dev_out->ifindex;
1173        gateway = DN_FIB_RES_GW(res);
1174
1175make_route:
1176        if (dev_out->flags & IFF_LOOPBACK)
1177                flags |= RTCF_LOCAL;
1178
1179        rt = dst_alloc(&dn_dst_ops, dev_out, 1, DST_OBSOLETE_NONE, DST_HOST);
1180        if (rt == NULL)
1181                goto e_nobufs;
1182
1183        memset(&rt->fld, 0, sizeof(rt->fld));
1184        rt->fld.saddr        = oldflp->saddr;
1185        rt->fld.daddr        = oldflp->daddr;
1186        rt->fld.flowidn_oif  = oldflp->flowidn_oif;
1187        rt->fld.flowidn_iif  = 0;
1188        rt->fld.flowidn_mark = oldflp->flowidn_mark;
1189
1190        rt->rt_saddr      = fld.saddr;
1191        rt->rt_daddr      = fld.daddr;
1192        rt->rt_gateway    = gateway ? gateway : fld.daddr;
1193        rt->rt_local_src  = fld.saddr;
1194
1195        rt->rt_dst_map    = fld.daddr;
1196        rt->rt_src_map    = fld.saddr;
1197
1198        rt->n = neigh;
1199        neigh = NULL;
1200
1201        rt->dst.lastuse = jiffies;
1202        rt->dst.output  = dn_output;
1203        rt->dst.input   = dn_rt_bug;
1204        rt->rt_flags      = flags;
1205        if (flags & RTCF_LOCAL)
1206                rt->dst.input = dn_nsp_rx;
1207
1208        err = dn_rt_set_next_hop(rt, &res);
1209        if (err)
1210                goto e_neighbour;
1211
1212        hash = dn_hash(rt->fld.saddr, rt->fld.daddr);
1213        dn_insert_route(rt, hash, (struct dn_route **)pprt);
1214
1215done:
1216        if (neigh)
1217                neigh_release(neigh);
1218        if (free_res)
1219                dn_fib_res_put(&res);
1220        if (dev_out)
1221                dev_put(dev_out);
1222out:
1223        return err;
1224
1225e_addr:
1226        err = -EADDRNOTAVAIL;
1227        goto done;
1228e_inval:
1229        err = -EINVAL;
1230        goto done;
1231e_nobufs:
1232        err = -ENOBUFS;
1233        goto done;
1234e_neighbour:
1235        dst_free(&rt->dst);
1236        goto e_nobufs;
1237}
1238
1239
1240/*
1241 * N.B. The flags may be moved into the flowi at some future stage.
1242 */
1243static int __dn_route_output_key(struct dst_entry **pprt, const struct flowidn *flp, int flags)
1244{
1245        unsigned int hash = dn_hash(flp->saddr, flp->daddr);
1246        struct dn_route *rt = NULL;
1247
1248        if (!(flags & MSG_TRYHARD)) {
1249                rcu_read_lock_bh();
1250                for (rt = rcu_dereference_bh(dn_rt_hash_table[hash].chain); rt;
1251                        rt = rcu_dereference_bh(rt->dst.dn_next)) {
1252                        if ((flp->daddr == rt->fld.daddr) &&
1253                            (flp->saddr == rt->fld.saddr) &&
1254                            (flp->flowidn_mark == rt->fld.flowidn_mark) &&
1255                            dn_is_output_route(rt) &&
1256                            (rt->fld.flowidn_oif == flp->flowidn_oif)) {
1257                                dst_use(&rt->dst, jiffies);
1258                                rcu_read_unlock_bh();
1259                                *pprt = &rt->dst;
1260                                return 0;
1261                        }
1262                }
1263                rcu_read_unlock_bh();
1264        }
1265
1266        return dn_route_output_slow(pprt, flp, flags);
1267}
1268
1269static int dn_route_output_key(struct dst_entry **pprt, struct flowidn *flp, int flags)
1270{
1271        int err;
1272
1273        err = __dn_route_output_key(pprt, flp, flags);
1274        if (err == 0 && flp->flowidn_proto) {
1275                *pprt = xfrm_lookup(&init_net, *pprt,
1276                                    flowidn_to_flowi(flp), NULL, 0);
1277                if (IS_ERR(*pprt)) {
1278                        err = PTR_ERR(*pprt);
1279                        *pprt = NULL;
1280                }
1281        }
1282        return err;
1283}
1284
1285int dn_route_output_sock(struct dst_entry **pprt, struct flowidn *fl, struct sock *sk, int flags)
1286{
1287        int err;
1288
1289        err = __dn_route_output_key(pprt, fl, flags & MSG_TRYHARD);
1290        if (err == 0 && fl->flowidn_proto) {
1291                if (!(flags & MSG_DONTWAIT))
1292                        fl->flowidn_flags |= FLOWI_FLAG_CAN_SLEEP;
1293                *pprt = xfrm_lookup(&init_net, *pprt,
1294                                    flowidn_to_flowi(fl), sk, 0);
1295                if (IS_ERR(*pprt)) {
1296                        err = PTR_ERR(*pprt);
1297                        *pprt = NULL;
1298                }
1299        }
1300        return err;
1301}
1302
1303static int dn_route_input_slow(struct sk_buff *skb)
1304{
1305        struct dn_route *rt = NULL;
1306        struct dn_skb_cb *cb = DN_SKB_CB(skb);
1307        struct net_device *in_dev = skb->dev;
1308        struct net_device *out_dev = NULL;
1309        struct dn_dev *dn_db;
1310        struct neighbour *neigh = NULL;
1311        unsigned int hash;
1312        int flags = 0;
1313        __le16 gateway = 0;
1314        __le16 local_src = 0;
1315        struct flowidn fld = {
1316                .daddr = cb->dst,
1317                .saddr = cb->src,
1318                .flowidn_scope = RT_SCOPE_UNIVERSE,
1319                .flowidn_mark = skb->mark,
1320                .flowidn_iif = skb->dev->ifindex,
1321        };
1322        struct dn_fib_res res = { .fi = NULL, .type = RTN_UNREACHABLE };
1323        int err = -EINVAL;
1324        int free_res = 0;
1325
1326        dev_hold(in_dev);
1327
1328        if ((dn_db = rcu_dereference(in_dev->dn_ptr)) == NULL)
1329                goto out;
1330
1331        /* Zero source addresses are not allowed */
1332        if (fld.saddr == 0)
1333                goto out;
1334
1335        /*
1336         * In this case we've just received a packet from a source
1337         * outside ourselves pretending to come from us. We don't
1338         * allow it any further to prevent routing loops, spoofing and
1339         * other nasties. Loopback packets already have the dst attached
1340         * so this only affects packets which have originated elsewhere.
1341         */
1342        err  = -ENOTUNIQ;
1343        if (dn_dev_islocal(in_dev, cb->src))
1344                goto out;
1345
1346        err = dn_fib_lookup(&fld, &res);
1347        if (err) {
1348                if (err != -ESRCH)
1349                        goto out;
1350                /*
1351                 * Is the destination us ?
1352                 */
1353                if (!dn_dev_islocal(in_dev, cb->dst))
1354                        goto e_inval;
1355
1356                res.type = RTN_LOCAL;
1357        } else {
1358                __le16 src_map = fld.saddr;
1359                free_res = 1;
1360
1361                out_dev = DN_FIB_RES_DEV(res);
1362                if (out_dev == NULL) {
1363                        net_crit_ratelimited("Bug in dn_route_input_slow() No output device\n");
1364                        goto e_inval;
1365                }
1366                dev_hold(out_dev);
1367
1368                if (res.r)
1369                        src_map = fld.saddr; /* no NAT support for now */
1370
1371                gateway = DN_FIB_RES_GW(res);
1372                if (res.type == RTN_NAT) {
1373                        fld.daddr = dn_fib_rules_map_destination(fld.daddr, &res);
1374                        dn_fib_res_put(&res);
1375                        free_res = 0;
1376                        if (dn_fib_lookup(&fld, &res))
1377                                goto e_inval;
1378                        free_res = 1;
1379                        if (res.type != RTN_UNICAST)
1380                                goto e_inval;
1381                        flags |= RTCF_DNAT;
1382                        gateway = fld.daddr;
1383                }
1384                fld.saddr = src_map;
1385        }
1386
1387        switch(res.type) {
1388        case RTN_UNICAST:
1389                /*
1390                 * Forwarding check here, we only check for forwarding
1391                 * being turned off, if you want to only forward intra
1392                 * area, its up to you to set the routing tables up
1393                 * correctly.
1394                 */
1395                if (dn_db->parms.forwarding == 0)
1396                        goto e_inval;
1397
1398                if (res.fi->fib_nhs > 1 && fld.flowidn_oif == 0)
1399                        dn_fib_select_multipath(&fld, &res);
1400
1401                /*
1402                 * Check for out_dev == in_dev. We use the RTCF_DOREDIRECT
1403                 * flag as a hint to set the intra-ethernet bit when
1404                 * forwarding. If we've got NAT in operation, we don't do
1405                 * this optimisation.
1406                 */
1407                if (out_dev == in_dev && !(flags & RTCF_NAT))
1408                        flags |= RTCF_DOREDIRECT;
1409
1410                local_src = DN_FIB_RES_PREFSRC(res);
1411
1412        case RTN_BLACKHOLE:
1413        case RTN_UNREACHABLE:
1414                break;
1415        case RTN_LOCAL:
1416                flags |= RTCF_LOCAL;
1417                fld.saddr = cb->dst;
1418                fld.daddr = cb->src;
1419
1420                /* Routing tables gave us a gateway */
1421                if (gateway)
1422                        goto make_route;
1423
1424                /* Packet was intra-ethernet, so we know its on-link */
1425                if (cb->rt_flags & DN_RT_F_IE) {
1426                        gateway = cb->src;
1427                        goto make_route;
1428                }
1429
1430                /* Use the default router if there is one */
1431                neigh = neigh_clone(dn_db->router);
1432                if (neigh) {
1433                        gateway = ((struct dn_neigh *)neigh)->addr;
1434                        goto make_route;
1435                }
1436
1437                /* Close eyes and pray */
1438                gateway = cb->src;
1439                goto make_route;
1440        default:
1441                goto e_inval;
1442        }
1443
1444make_route:
1445        rt = dst_alloc(&dn_dst_ops, out_dev, 0, DST_OBSOLETE_NONE, DST_HOST);
1446        if (rt == NULL)
1447                goto e_nobufs;
1448
1449        memset(&rt->fld, 0, sizeof(rt->fld));
1450        rt->rt_saddr      = fld.saddr;
1451        rt->rt_daddr      = fld.daddr;
1452        rt->rt_gateway    = fld.daddr;
1453        if (gateway)
1454                rt->rt_gateway = gateway;
1455        rt->rt_local_src  = local_src ? local_src : rt->rt_saddr;
1456
1457        rt->rt_dst_map    = fld.daddr;
1458        rt->rt_src_map    = fld.saddr;
1459
1460        rt->fld.saddr        = cb->src;
1461        rt->fld.daddr        = cb->dst;
1462        rt->fld.flowidn_oif  = 0;
1463        rt->fld.flowidn_iif  = in_dev->ifindex;
1464        rt->fld.flowidn_mark = fld.flowidn_mark;
1465
1466        rt->n = neigh;
1467        rt->dst.lastuse = jiffies;
1468        rt->dst.output = dn_rt_bug;
1469        switch (res.type) {
1470        case RTN_UNICAST:
1471                rt->dst.input = dn_forward;
1472                break;
1473        case RTN_LOCAL:
1474                rt->dst.output = dn_output;
1475                rt->dst.input = dn_nsp_rx;
1476                rt->dst.dev = in_dev;
1477                flags |= RTCF_LOCAL;
1478                break;
1479        default:
1480        case RTN_UNREACHABLE:
1481        case RTN_BLACKHOLE:
1482                rt->dst.input = dst_discard;
1483        }
1484        rt->rt_flags = flags;
1485
1486        err = dn_rt_set_next_hop(rt, &res);
1487        if (err)
1488                goto e_neighbour;
1489
1490        hash = dn_hash(rt->fld.saddr, rt->fld.daddr);
1491        dn_insert_route(rt, hash, &rt);
1492        skb_dst_set(skb, &rt->dst);
1493
1494done:
1495        if (neigh)
1496                neigh_release(neigh);
1497        if (free_res)
1498                dn_fib_res_put(&res);
1499        dev_put(in_dev);
1500        if (out_dev)
1501                dev_put(out_dev);
1502out:
1503        return err;
1504
1505e_inval:
1506        err = -EINVAL;
1507        goto done;
1508
1509e_nobufs:
1510        err = -ENOBUFS;
1511        goto done;
1512
1513e_neighbour:
1514        dst_free(&rt->dst);
1515        goto done;
1516}
1517
1518static int dn_route_input(struct sk_buff *skb)
1519{
1520        struct dn_route *rt;
1521        struct dn_skb_cb *cb = DN_SKB_CB(skb);
1522        unsigned int hash = dn_hash(cb->src, cb->dst);
1523
1524        if (skb_dst(skb))
1525                return 0;
1526
1527        rcu_read_lock();
1528        for(rt = rcu_dereference(dn_rt_hash_table[hash].chain); rt != NULL;
1529            rt = rcu_dereference(rt->dst.dn_next)) {
1530                if ((rt->fld.saddr == cb->src) &&
1531                    (rt->fld.daddr == cb->dst) &&
1532                    (rt->fld.flowidn_oif == 0) &&
1533                    (rt->fld.flowidn_mark == skb->mark) &&
1534                    (rt->fld.flowidn_iif == cb->iif)) {
1535                        dst_use(&rt->dst, jiffies);
1536                        rcu_read_unlock();
1537                        skb_dst_set(skb, (struct dst_entry *)rt);
1538                        return 0;
1539                }
1540        }
1541        rcu_read_unlock();
1542
1543        return dn_route_input_slow(skb);
1544}
1545
1546static int dn_rt_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
1547                           int event, int nowait, unsigned int flags)
1548{
1549        struct dn_route *rt = (struct dn_route *)skb_dst(skb);
1550        struct rtmsg *r;
1551        struct nlmsghdr *nlh;
1552        long expires;
1553
1554        nlh = nlmsg_put(skb, portid, seq, event, sizeof(*r), flags);
1555        if (!nlh)
1556                return -EMSGSIZE;
1557
1558        r = nlmsg_data(nlh);
1559        r->rtm_family = AF_DECnet;
1560        r->rtm_dst_len = 16;
1561        r->rtm_src_len = 0;
1562        r->rtm_tos = 0;
1563        r->rtm_table = RT_TABLE_MAIN;
1564        r->rtm_type = rt->rt_type;
1565        r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED;
1566        r->rtm_scope = RT_SCOPE_UNIVERSE;
1567        r->rtm_protocol = RTPROT_UNSPEC;
1568
1569        if (rt->rt_flags & RTCF_NOTIFY)
1570                r->rtm_flags |= RTM_F_NOTIFY;
1571
1572        if (nla_put_u32(skb, RTA_TABLE, RT_TABLE_MAIN) < 0 ||
1573            nla_put_le16(skb, RTA_DST, rt->rt_daddr) < 0)
1574                goto errout;
1575
1576        if (rt->fld.saddr) {
1577                r->rtm_src_len = 16;
1578                if (nla_put_le16(skb, RTA_SRC, rt->fld.saddr) < 0)
1579                        goto errout;
1580        }
1581        if (rt->dst.dev &&
1582            nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex) < 0)
1583                goto errout;
1584
1585        /*
1586         * Note to self - change this if input routes reverse direction when
1587         * they deal only with inputs and not with replies like they do
1588         * currently.
1589         */
1590        if (nla_put_le16(skb, RTA_PREFSRC, rt->rt_local_src) < 0)
1591                goto errout;
1592
1593        if (rt->rt_daddr != rt->rt_gateway &&
1594            nla_put_le16(skb, RTA_GATEWAY, rt->rt_gateway) < 0)
1595                goto errout;
1596
1597        if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0)
1598                goto errout;
1599
1600        expires = rt->dst.expires ? rt->dst.expires - jiffies : 0;
1601        if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires,
1602                               rt->dst.error) < 0)
1603                goto errout;
1604
1605        if (dn_is_input_route(rt) &&
1606            nla_put_u32(skb, RTA_IIF, rt->fld.flowidn_iif) < 0)
1607                goto errout;
1608
1609        return nlmsg_end(skb, nlh);
1610
1611errout:
1612        nlmsg_cancel(skb, nlh);
1613        return -EMSGSIZE;
1614}
1615
1616/*
1617 * This is called by both endnodes and routers now.
1618 */
1619static int dn_cache_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, void *arg)
1620{
1621        struct net *net = sock_net(in_skb->sk);
1622        struct rtattr **rta = arg;
1623        struct rtmsg *rtm = nlmsg_data(nlh);
1624        struct dn_route *rt = NULL;
1625        struct dn_skb_cb *cb;
1626        int err;
1627        struct sk_buff *skb;
1628        struct flowidn fld;
1629
1630        if (!net_eq(net, &init_net))
1631                return -EINVAL;
1632
1633        memset(&fld, 0, sizeof(fld));
1634        fld.flowidn_proto = DNPROTO_NSP;
1635
1636        skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1637        if (skb == NULL)
1638                return -ENOBUFS;
1639        skb_reset_mac_header(skb);
1640        cb = DN_SKB_CB(skb);
1641
1642        if (rta[RTA_SRC-1])
1643                memcpy(&fld.saddr, RTA_DATA(rta[RTA_SRC-1]), 2);
1644        if (rta[RTA_DST-1])
1645                memcpy(&fld.daddr, RTA_DATA(rta[RTA_DST-1]), 2);
1646        if (rta[RTA_IIF-1])
1647                memcpy(&fld.flowidn_iif, RTA_DATA(rta[RTA_IIF-1]), sizeof(int));
1648
1649        if (fld.flowidn_iif) {
1650                struct net_device *dev;
1651                if ((dev = dev_get_by_index(&init_net, fld.flowidn_iif)) == NULL) {
1652                        kfree_skb(skb);
1653                        return -ENODEV;
1654                }
1655                if (!dev->dn_ptr) {
1656                        dev_put(dev);
1657                        kfree_skb(skb);
1658                        return -ENODEV;
1659                }
1660                skb->protocol = htons(ETH_P_DNA_RT);
1661                skb->dev = dev;
1662                cb->src = fld.saddr;
1663                cb->dst = fld.daddr;
1664                local_bh_disable();
1665                err = dn_route_input(skb);
1666                local_bh_enable();
1667                memset(cb, 0, sizeof(struct dn_skb_cb));
1668                rt = (struct dn_route *)skb_dst(skb);
1669                if (!err && -rt->dst.error)
1670                        err = rt->dst.error;
1671        } else {
1672                int oif = 0;
1673                if (rta[RTA_OIF - 1])
1674                        memcpy(&oif, RTA_DATA(rta[RTA_OIF - 1]), sizeof(int));
1675                fld.flowidn_oif = oif;
1676                err = dn_route_output_key((struct dst_entry **)&rt, &fld, 0);
1677        }
1678
1679        if (skb->dev)
1680                dev_put(skb->dev);
1681        skb->dev = NULL;
1682        if (err)
1683                goto out_free;
1684        skb_dst_set(skb, &rt->dst);
1685        if (rtm->rtm_flags & RTM_F_NOTIFY)
1686                rt->rt_flags |= RTCF_NOTIFY;
1687
1688        err = dn_rt_fill_info(skb, NETLINK_CB(in_skb).portid, nlh->nlmsg_seq, RTM_NEWROUTE, 0, 0);
1689
1690        if (err == 0)
1691                goto out_free;
1692        if (err < 0) {
1693                err = -EMSGSIZE;
1694                goto out_free;
1695        }
1696
1697        return rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).portid);
1698
1699out_free:
1700        kfree_skb(skb);
1701        return err;
1702}
1703
1704/*
1705 * For routers, this is called from dn_fib_dump, but for endnodes its
1706 * called directly from the rtnetlink dispatch table.
1707 */
1708int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb)
1709{
1710        struct net *net = sock_net(skb->sk);
1711        struct dn_route *rt;
1712        int h, s_h;
1713        int idx, s_idx;
1714        struct rtmsg *rtm;
1715
1716        if (!net_eq(net, &init_net))
1717                return 0;
1718
1719        if (nlmsg_len(cb->nlh) < sizeof(struct rtmsg))
1720                return -EINVAL;
1721
1722        rtm = nlmsg_data(cb->nlh);
1723        if (!(rtm->rtm_flags & RTM_F_CLONED))
1724                return 0;
1725
1726        s_h = cb->args[0];
1727        s_idx = idx = cb->args[1];
1728        for(h = 0; h <= dn_rt_hash_mask; h++) {
1729                if (h < s_h)
1730                        continue;
1731                if (h > s_h)
1732                        s_idx = 0;
1733                rcu_read_lock_bh();
1734                for(rt = rcu_dereference_bh(dn_rt_hash_table[h].chain), idx = 0;
1735                        rt;
1736                        rt = rcu_dereference_bh(rt->dst.dn_next), idx++) {
1737                        if (idx < s_idx)
1738                                continue;
1739                        skb_dst_set(skb, dst_clone(&rt->dst));
1740                        if (dn_rt_fill_info(skb, NETLINK_CB(cb->skb).portid,
1741                                        cb->nlh->nlmsg_seq, RTM_NEWROUTE,
1742                                        1, NLM_F_MULTI) <= 0) {
1743                                skb_dst_drop(skb);
1744                                rcu_read_unlock_bh();
1745                                goto done;
1746                        }
1747                        skb_dst_drop(skb);
1748                }
1749                rcu_read_unlock_bh();
1750        }
1751
1752done:
1753        cb->args[0] = h;
1754        cb->args[1] = idx;
1755        return skb->len;
1756}
1757
1758#ifdef CONFIG_PROC_FS
1759struct dn_rt_cache_iter_state {
1760        int bucket;
1761};
1762
1763static struct dn_route *dn_rt_cache_get_first(struct seq_file *seq)
1764{
1765        struct dn_route *rt = NULL;
1766        struct dn_rt_cache_iter_state *s = seq->private;
1767
1768        for(s->bucket = dn_rt_hash_mask; s->bucket >= 0; --s->bucket) {
1769                rcu_read_lock_bh();
1770                rt = rcu_dereference_bh(dn_rt_hash_table[s->bucket].chain);
1771                if (rt)
1772                        break;
1773                rcu_read_unlock_bh();
1774        }
1775        return rt;
1776}
1777
1778static struct dn_route *dn_rt_cache_get_next(struct seq_file *seq, struct dn_route *rt)
1779{
1780        struct dn_rt_cache_iter_state *s = seq->private;
1781
1782        rt = rcu_dereference_bh(rt->dst.dn_next);
1783        while (!rt) {
1784                rcu_read_unlock_bh();
1785                if (--s->bucket < 0)
1786                        break;
1787                rcu_read_lock_bh();
1788                rt = rcu_dereference_bh(dn_rt_hash_table[s->bucket].chain);
1789        }
1790        return rt;
1791}
1792
1793static void *dn_rt_cache_seq_start(struct seq_file *seq, loff_t *pos)
1794{
1795        struct dn_route *rt = dn_rt_cache_get_first(seq);
1796
1797        if (rt) {
1798                while(*pos && (rt = dn_rt_cache_get_next(seq, rt)))
1799                        --*pos;
1800        }
1801        return *pos ? NULL : rt;
1802}
1803
1804static void *dn_rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1805{
1806        struct dn_route *rt = dn_rt_cache_get_next(seq, v);
1807        ++*pos;
1808        return rt;
1809}
1810
1811static void dn_rt_cache_seq_stop(struct seq_file *seq, void *v)
1812{
1813        if (v)
1814                rcu_read_unlock_bh();
1815}
1816
1817static int dn_rt_cache_seq_show(struct seq_file *seq, void *v)
1818{
1819        struct dn_route *rt = v;
1820        char buf1[DN_ASCBUF_LEN], buf2[DN_ASCBUF_LEN];
1821
1822        seq_printf(seq, "%-8s %-7s %-7s %04d %04d %04d\n",
1823                   rt->dst.dev ? rt->dst.dev->name : "*",
1824                   dn_addr2asc(le16_to_cpu(rt->rt_daddr), buf1),
1825                   dn_addr2asc(le16_to_cpu(rt->rt_saddr), buf2),
1826                   atomic_read(&rt->dst.__refcnt),
1827                   rt->dst.__use, 0);
1828        return 0;
1829}
1830
1831static const struct seq_operations dn_rt_cache_seq_ops = {
1832        .start  = dn_rt_cache_seq_start,
1833        .next   = dn_rt_cache_seq_next,
1834        .stop   = dn_rt_cache_seq_stop,
1835        .show   = dn_rt_cache_seq_show,
1836};
1837
1838static int dn_rt_cache_seq_open(struct inode *inode, struct file *file)
1839{
1840        return seq_open_private(file, &dn_rt_cache_seq_ops,
1841                        sizeof(struct dn_rt_cache_iter_state));
1842}
1843
1844static const struct file_operations dn_rt_cache_seq_fops = {
1845        .owner   = THIS_MODULE,
1846        .open    = dn_rt_cache_seq_open,
1847        .read    = seq_read,
1848        .llseek  = seq_lseek,
1849        .release = seq_release_private,
1850};
1851
1852#endif /* CONFIG_PROC_FS */
1853
1854void __init dn_route_init(void)
1855{
1856        int i, goal, order;
1857
1858        dn_dst_ops.kmem_cachep =
1859                kmem_cache_create("dn_dst_cache", sizeof(struct dn_route), 0,
1860                                  SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
1861        dst_entries_init(&dn_dst_ops);
1862        setup_timer(&dn_route_timer, dn_dst_check_expire, 0);
1863        dn_route_timer.expires = jiffies + decnet_dst_gc_interval * HZ;
1864        add_timer(&dn_route_timer);
1865
1866        goal = totalram_pages >> (26 - PAGE_SHIFT);
1867
1868        for(order = 0; (1UL << order) < goal; order++)
1869                /* NOTHING */;
1870
1871        /*
1872         * Only want 1024 entries max, since the table is very, very unlikely
1873         * to be larger than that.
1874         */
1875        while(order && ((((1UL << order) * PAGE_SIZE) /
1876                                sizeof(struct dn_rt_hash_bucket)) >= 2048))
1877                order--;
1878
1879        do {
1880                dn_rt_hash_mask = (1UL << order) * PAGE_SIZE /
1881                        sizeof(struct dn_rt_hash_bucket);
1882                while(dn_rt_hash_mask & (dn_rt_hash_mask - 1))
1883                        dn_rt_hash_mask--;
1884                dn_rt_hash_table = (struct dn_rt_hash_bucket *)
1885                        __get_free_pages(GFP_ATOMIC, order);
1886        } while (dn_rt_hash_table == NULL && --order > 0);
1887
1888        if (!dn_rt_hash_table)
1889                panic("Failed to allocate DECnet route cache hash table\n");
1890
1891        printk(KERN_INFO
1892                "DECnet: Routing cache hash table of %u buckets, %ldKbytes\n",
1893                dn_rt_hash_mask,
1894                (long)(dn_rt_hash_mask*sizeof(struct dn_rt_hash_bucket))/1024);
1895
1896        dn_rt_hash_mask--;
1897        for(i = 0; i <= dn_rt_hash_mask; i++) {
1898                spin_lock_init(&dn_rt_hash_table[i].lock);
1899                dn_rt_hash_table[i].chain = NULL;
1900        }
1901
1902        dn_dst_ops.gc_thresh = (dn_rt_hash_mask + 1);
1903
1904        proc_net_fops_create(&init_net, "decnet_cache", S_IRUGO, &dn_rt_cache_seq_fops);
1905
1906#ifdef CONFIG_DECNET_ROUTER
1907        rtnl_register(PF_DECnet, RTM_GETROUTE, dn_cache_getroute,
1908                      dn_fib_dump, NULL);
1909#else
1910        rtnl_register(PF_DECnet, RTM_GETROUTE, dn_cache_getroute,
1911                      dn_cache_dump, NULL);
1912#endif
1913}
1914
1915void __exit dn_route_cleanup(void)
1916{
1917        del_timer(&dn_route_timer);
1918        dn_run_flush(0);
1919
1920        proc_net_remove(&init_net, "decnet_cache");
1921        dst_entries_destroy(&dn_dst_ops);
1922}
1923
1924
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