net/mctp/route.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Management Component Transport Protocol (MCTP) - routing
   4  * implementation.
   5  *
   6  * This is currently based on a simple routing table, with no dst cache. The
   7  * number of routes should stay fairly small, so the lookup cost is small.
   8  *
   9  * Copyright (c) 2021 Code Construct
  10  * Copyright (c) 2021 Google
  11  */
  12
  13 #include <linux/idr.h>
  14 #include <linux/kconfig.h>
  15 #include <linux/mctp.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/rtnetlink.h>
  18 #include <linux/skbuff.h>
  19
  20 #include <uapi/linux/if_arp.h>
  21
  22 #include <net/mctp.h>
  23 #include <net/mctpdevice.h>
  24 #include <net/netlink.h>
  25 #include <net/sock.h>
  26
  27 #include <trace/events/mctp.h>
  28
  29 static const unsigned int mctp_message_maxlen = 64 * 1024;
  30 static const unsigned long mctp_key_lifetime = 6 * CONFIG_HZ;
  31
  32 static void mctp_flow_prepare_output(struct sk_buff *skb, struct mctp_dev *dev);
  33
  34 /* route output callbacks */
  35 static int mctp_route_discard(struct mctp_route *route, struct sk_buff *skb)
  36 {
  37         kfree_skb(skb);
  38         return 0;
  39 }
  40
  41 static struct mctp_sock *mctp_lookup_bind(struct net *net, struct sk_buff *skb)
  42 {
  43         struct mctp_skb_cb *cb = mctp_cb(skb);
  44         struct mctp_hdr *mh;
  45         struct sock *sk;
  46         u8 type;
  47
  48         WARN_ON(!rcu_read_lock_held());
  49
  50         /* TODO: look up in skb->cb? */
  51         mh = mctp_hdr(skb);
  52
  53         if (!skb_headlen(skb))
  54                 return NULL;
  55
  56         type = (*(u8 *)skb->data) & 0x7f;
  57
  58         sk_for_each_rcu(sk, &net->mctp.binds) {
  59                 struct mctp_sock *msk = container_of(sk, struct mctp_sock, sk);
  60
  61                 if (msk->bind_net != MCTP_NET_ANY && msk->bind_net != cb->net)
  62                         continue;
  63
  64                 if (msk->bind_type != type)
  65                         continue;
  66
  67                 if (!mctp_address_matches(msk->bind_addr, mh->dest))
  68                         continue;
  69
  70                 return msk;
  71         }
  72
  73         return NULL;
  74 }
  75
  76 static bool mctp_key_match(struct mctp_sk_key *key, mctp_eid_t local,
  77                            mctp_eid_t peer, u8 tag)
  78 {
  79         if (!mctp_address_matches(key->local_addr, local))
  80                 return false;
  81
  82         if (key->peer_addr != peer)
  83                 return false;
  84
  85         if (key->tag != tag)
  86                 return false;
  87
  88         return true;
  89 }
  90
  91 /* returns a key (with key->lock held, and refcounted), or NULL if no such
  92  * key exists.
  93  */
  94 static struct mctp_sk_key *mctp_lookup_key(struct net *net, struct sk_buff *skb,
  95                                            mctp_eid_t peer,
  96                                            unsigned long *irqflags)
  97         __acquires(&key->lock)
  98 {
  99         struct mctp_sk_key *key, *ret;
 100         unsigned long flags;
 101         struct mctp_hdr *mh;
 102         u8 tag;
 103
 104         mh = mctp_hdr(skb);
 105         tag = mh->flags_seq_tag & (MCTP_HDR_TAG_MASK | MCTP_HDR_FLAG_TO);
 106
 107         ret = NULL;
 108         spin_lock_irqsave(&net->mctp.keys_lock, flags);
 109
 110         hlist_for_each_entry(key, &net->mctp.keys, hlist) {
 111                 if (!mctp_key_match(key, mh->dest, peer, tag))
 112                         continue;
 113
 114                 spin_lock(&key->lock);
 115                 if (key->valid) {
 116                         refcount_inc(&key->refs);
 117                         ret = key;
 118                         break;
 119                 }
 120                 spin_unlock(&key->lock);
 121         }
 122
 123         if (ret) {
 124                 spin_unlock(&net->mctp.keys_lock);
 125                 *irqflags = flags;
 126         } else {
 127                 spin_unlock_irqrestore(&net->mctp.keys_lock, flags);
 128         }
 129
 130         return ret;
 131 }
 132
 133 static struct mctp_sk_key *mctp_key_alloc(struct mctp_sock *msk,
 134                                           mctp_eid_t local, mctp_eid_t peer,
 135                                           u8 tag, gfp_t gfp)
 136 {
 137         struct mctp_sk_key *key;
 138
 139         key = kzalloc(sizeof(*key), gfp);
 140         if (!key)
 141                 return NULL;
 142
 143         key->peer_addr = peer;
 144         key->local_addr = local;
 145         key->tag = tag;
 146         key->sk = &msk->sk;
 147         key->valid = true;
 148         spin_lock_init(&key->lock);
 149         refcount_set(&key->refs, 1);
 150
 151         return key;
 152 }
 153
 154 void mctp_key_unref(struct mctp_sk_key *key)
 155 {
 156         unsigned long flags;
 157
 158         if (!refcount_dec_and_test(&key->refs))
 159                 return;
 160
 161         /* even though no refs exist here, the lock allows us to stay
 162          * consistent with the locking requirement of mctp_dev_release_key
 163          */
 164         spin_lock_irqsave(&key->lock, flags);
 165         mctp_dev_release_key(key->dev, key);
 166         spin_unlock_irqrestore(&key->lock, flags);
 167
 168         kfree(key);
 169 }
 170
 171 static int mctp_key_add(struct mctp_sk_key *key, struct mctp_sock *msk)
 172 {
 173         struct net *net = sock_net(&msk->sk);
 174         struct mctp_sk_key *tmp;
 175         unsigned long flags;
 176         int rc = 0;
 177
 178         spin_lock_irqsave(&net->mctp.keys_lock, flags);
 179
 180         hlist_for_each_entry(tmp, &net->mctp.keys, hlist) {
 181                 if (mctp_key_match(tmp, key->local_addr, key->peer_addr,
 182                                    key->tag)) {
 183                         spin_lock(&tmp->lock);
 184                         if (tmp->valid)
 185                                 rc = -EEXIST;
 186                         spin_unlock(&tmp->lock);
 187                         if (rc)
 188                                 break;
 189                 }
 190         }
 191
 192         if (!rc) {
 193                 refcount_inc(&key->refs);
 194                 key->expiry = jiffies + mctp_key_lifetime;
 195                 timer_reduce(&msk->key_expiry, key->expiry);
 196
 197                 hlist_add_head(&key->hlist, &net->mctp.keys);
 198                 hlist_add_head(&key->sklist, &msk->keys);
 199         }
 200
 201         spin_unlock_irqrestore(&net->mctp.keys_lock, flags);
 202
 203         return rc;
 204 }
 205
 206 /* Helper for mctp_route_input().
 207  * We're done with the key; unlock and unref the key.
 208  * For the usual case of automatic expiry we remove the key from lists.
 209  * In the case that manual allocation is set on a key we release the lock
 210  * and local ref, reset reassembly, but don't remove from lists.
 211  */
 212 static void __mctp_key_done_in(struct mctp_sk_key *key, struct net *net,
 213                                unsigned long flags, unsigned long reason)
 214 __releases(&key->lock)
 215 {
 216         struct sk_buff *skb;
 217
 218         trace_mctp_key_release(key, reason);
 219         skb = key->reasm_head;
 220         key->reasm_head = NULL;
 221
 222         if (!key->manual_alloc) {
 223                 key->reasm_dead = true;
 224                 key->valid = false;
 225                 mctp_dev_release_key(key->dev, key);
 226         }
 227         spin_unlock_irqrestore(&key->lock, flags);
 228
 229         if (!key->manual_alloc) {
 230                 spin_lock_irqsave(&net->mctp.keys_lock, flags);
 231                 hlist_del(&key->hlist);
 232                 hlist_del(&key->sklist);
 233                 spin_unlock_irqrestore(&net->mctp.keys_lock, flags);
 234
 235                 /* unref for the lists */
 236                 mctp_key_unref(key);
 237         }
 238
 239         /* and one for the local reference */
 240         mctp_key_unref(key);
 241
 242         kfree_skb(skb);
 243 }
 244
 245 #ifdef CONFIG_MCTP_FLOWS
 246 static void mctp_skb_set_flow(struct sk_buff *skb, struct mctp_sk_key *key)
 247 {
 248         struct mctp_flow *flow;
 249
 250         flow = skb_ext_add(skb, SKB_EXT_MCTP);
 251         if (!flow)
 252                 return;
 253
 254         refcount_inc(&key->refs);
 255         flow->key = key;
 256 }
 257
 258 static void mctp_flow_prepare_output(struct sk_buff *skb, struct mctp_dev *dev)
 259 {
 260         struct mctp_sk_key *key;
 261         struct mctp_flow *flow;
 262
 263         flow = skb_ext_find(skb, SKB_EXT_MCTP);
 264         if (!flow)
 265                 return;
 266
 267         key = flow->key;
 268
 269         if (WARN_ON(key->dev && key->dev != dev))
 270                 return;
 271
 272         mctp_dev_set_key(dev, key);
 273 }
 274 #else
 275 static void mctp_skb_set_flow(struct sk_buff *skb, struct mctp_sk_key *key) {}
 276 static void mctp_flow_prepare_output(struct sk_buff *skb, struct mctp_dev *dev) {}
 277 #endif
 278
 279 static int mctp_frag_queue(struct mctp_sk_key *key, struct sk_buff *skb)
 280 {
 281         struct mctp_hdr *hdr = mctp_hdr(skb);
 282         u8 exp_seq, this_seq;
 283
 284         this_seq = (hdr->flags_seq_tag >> MCTP_HDR_SEQ_SHIFT)
 285                 & MCTP_HDR_SEQ_MASK;
 286
 287         if (!key->reasm_head) {
 288                 key->reasm_head = skb;
 289                 key->reasm_tailp = &(skb_shinfo(skb)->frag_list);
 290                 key->last_seq = this_seq;
 291                 return 0;
 292         }
 293
 294         exp_seq = (key->last_seq + 1) & MCTP_HDR_SEQ_MASK;
 295
 296         if (this_seq != exp_seq)
 297                 return -EINVAL;
 298
 299         if (key->reasm_head->len + skb->len > mctp_message_maxlen)
 300                 return -EINVAL;
 301
 302         skb->next = NULL;
 303         skb->sk = NULL;
 304         *key->reasm_tailp = skb;
 305         key->reasm_tailp = &skb->next;
 306
 307         key->last_seq = this_seq;
 308
 309         key->reasm_head->data_len += skb->len;
 310         key->reasm_head->len += skb->len;
 311         key->reasm_head->truesize += skb->truesize;
 312
 313         return 0;
 314 }
 315
 316 static int mctp_route_input(struct mctp_route *route, struct sk_buff *skb)
 317 {
 318         struct net *net = dev_net(skb->dev);
 319         struct mctp_sk_key *key;
 320         struct mctp_sock *msk;
 321         struct mctp_hdr *mh;
 322         unsigned long f;
 323         u8 tag, flags;
 324         int rc;
 325
 326         msk = NULL;
 327         rc = -EINVAL;
 328
 329         /* we may be receiving a locally-routed packet; drop source sk
 330          * accounting
 331          */
 332         skb_orphan(skb);
 333
 334         /* ensure we have enough data for a header and a type */
 335         if (skb->len < sizeof(struct mctp_hdr) + 1)
 336                 goto out;
 337
 338         /* grab header, advance data ptr */
 339         mh = mctp_hdr(skb);
 340         skb_pull(skb, sizeof(struct mctp_hdr));
 341
 342         if (mh->ver != 1)
 343                 goto out;
 344
 345         flags = mh->flags_seq_tag & (MCTP_HDR_FLAG_SOM | MCTP_HDR_FLAG_EOM);
 346         tag = mh->flags_seq_tag & (MCTP_HDR_TAG_MASK | MCTP_HDR_FLAG_TO);
 347
 348         rcu_read_lock();
 349
 350         /* lookup socket / reasm context, exactly matching (src,dest,tag).
 351          * we hold a ref on the key, and key->lock held.
 352          */
 353         key = mctp_lookup_key(net, skb, mh->src, &f);
 354
 355         if (flags & MCTP_HDR_FLAG_SOM) {
 356                 if (key) {
 357                         msk = container_of(key->sk, struct mctp_sock, sk);
 358                 } else {
 359                         /* first response to a broadcast? do a more general
 360                          * key lookup to find the socket, but don't use this
 361                          * key for reassembly - we'll create a more specific
 362                          * one for future packets if required (ie, !EOM).
 363                          */
 364                         key = mctp_lookup_key(net, skb, MCTP_ADDR_ANY, &f);
 365                         if (key) {
 366                                 msk = container_of(key->sk,
 367                                                    struct mctp_sock, sk);
 368                                 spin_unlock_irqrestore(&key->lock, f);
 369                                 mctp_key_unref(key);
 370                                 key = NULL;
 371                         }
 372                 }
 373
 374                 if (!key && !msk && (tag & MCTP_HDR_FLAG_TO))
 375                         msk = mctp_lookup_bind(net, skb);
 376
 377                 if (!msk) {
 378                         rc = -ENOENT;
 379                         goto out_unlock;
 380                 }
 381
 382                 /* single-packet message? deliver to socket, clean up any
 383                  * pending key.
 384                  */
 385                 if (flags & MCTP_HDR_FLAG_EOM) {
 386                         sock_queue_rcv_skb(&msk->sk, skb);
 387                         if (key) {
 388                                 /* we've hit a pending reassembly; not much we
 389                                  * can do but drop it
 390                                  */
 391                                 __mctp_key_done_in(key, net, f,
 392                                                    MCTP_TRACE_KEY_REPLIED);
 393                                 key = NULL;
 394                         }
 395                         rc = 0;
 396                         goto out_unlock;
 397                 }
 398
 399                 /* broadcast response or a bind() - create a key for further
 400                  * packets for this message
 401                  */
 402                 if (!key) {
 403                         key = mctp_key_alloc(msk, mh->dest, mh->src,
 404                                              tag, GFP_ATOMIC);
 405                         if (!key) {
 406                                 rc = -ENOMEM;
 407                                 goto out_unlock;
 408                         }
 409
 410                         /* we can queue without the key lock here, as the
 411                          * key isn't observable yet
 412                          */
 413                         mctp_frag_queue(key, skb);
 414
 415                         /* if the key_add fails, we've raced with another
 416                          * SOM packet with the same src, dest and tag. There's
 417                          * no way to distinguish future packets, so all we
 418                          * can do is drop; we'll free the skb on exit from
 419                          * this function.
 420                          */
 421                         rc = mctp_key_add(key, msk);
 422                         if (rc) {
 423                                 kfree(key);
 424                         } else {
 425                                 trace_mctp_key_acquire(key);
 426
 427                                 /* we don't need to release key->lock on exit */
 428                                 mctp_key_unref(key);
 429                         }
 430                         key = NULL;
 431
 432                 } else {
 433                         if (key->reasm_head || key->reasm_dead) {
 434                                 /* duplicate start? drop everything */
 435                                 __mctp_key_done_in(key, net, f,
 436                                                    MCTP_TRACE_KEY_INVALIDATED);
 437                                 rc = -EEXIST;
 438                                 key = NULL;
 439                         } else {
 440                                 rc = mctp_frag_queue(key, skb);
 441                         }
 442                 }
 443
 444         } else if (key) {
 445                 /* this packet continues a previous message; reassemble
 446                  * using the message-specific key
 447                  */
 448
 449                 /* we need to be continuing an existing reassembly... */
 450                 if (!key->reasm_head)
 451                         rc = -EINVAL;
 452                 else
 453                         rc = mctp_frag_queue(key, skb);
 454
 455                 /* end of message? deliver to socket, and we're done with
 456                  * the reassembly/response key
 457                  */
 458                 if (!rc && flags & MCTP_HDR_FLAG_EOM) {
 459                         sock_queue_rcv_skb(key->sk, key->reasm_head);
 460                         key->reasm_head = NULL;
 461                         __mctp_key_done_in(key, net, f, MCTP_TRACE_KEY_REPLIED);
 462                         key = NULL;
 463                 }
 464
 465         } else {
 466                 /* not a start, no matching key */
 467                 rc = -ENOENT;
 468         }
 469
 470 out_unlock:
 471         rcu_read_unlock();
 472         if (key) {
 473                 spin_unlock_irqrestore(&key->lock, f);
 474                 mctp_key_unref(key);
 475         }
 476 out:
 477         if (rc)
 478                 kfree_skb(skb);
 479         return rc;
 480 }
 481
 482 static unsigned int mctp_route_mtu(struct mctp_route *rt)
 483 {
 484         return rt->mtu ?: READ_ONCE(rt->dev->dev->mtu);
 485 }
 486
 487 static int mctp_route_output(struct mctp_route *route, struct sk_buff *skb)
 488 {
 489         struct mctp_skb_cb *cb = mctp_cb(skb);
 490         struct mctp_hdr *hdr = mctp_hdr(skb);
 491         char daddr_buf[MAX_ADDR_LEN];
 492         char *daddr = NULL;
 493         unsigned int mtu;
 494         int rc;
 495
 496         skb->protocol = htons(ETH_P_MCTP);
 497
 498         mtu = READ_ONCE(skb->dev->mtu);
 499         if (skb->len > mtu) {
 500                 kfree_skb(skb);
 501                 return -EMSGSIZE;
 502         }
 503
 504         if (cb->ifindex) {
 505                 /* direct route; use the hwaddr we stashed in sendmsg */
 506                 daddr = cb->haddr;
 507         } else {
 508                 /* If lookup fails let the device handle daddr==NULL */
 509                 if (mctp_neigh_lookup(route->dev, hdr->dest, daddr_buf) == 0)
 510                         daddr = daddr_buf;
 511         }
 512
 513         rc = dev_hard_header(skb, skb->dev, ntohs(skb->protocol),
 514                              daddr, skb->dev->dev_addr, skb->len);
 515         if (rc) {
 516                 kfree_skb(skb);
 517                 return -EHOSTUNREACH;
 518         }
 519
 520         mctp_flow_prepare_output(skb, route->dev);
 521
 522         rc = dev_queue_xmit(skb);
 523         if (rc)
 524                 rc = net_xmit_errno(rc);
 525
 526         return rc;
 527 }
 528
 529 /* route alloc/release */
 530 static void mctp_route_release(struct mctp_route *rt)
 531 {
 532         if (refcount_dec_and_test(&rt->refs)) {
 533                 mctp_dev_put(rt->dev);
 534                 kfree_rcu(rt, rcu);
 535         }
 536 }
 537
 538 /* returns a route with the refcount at 1 */
 539 static struct mctp_route *mctp_route_alloc(void)
 540 {
 541         struct mctp_route *rt;
 542
 543         rt = kzalloc(sizeof(*rt), GFP_KERNEL);
 544         if (!rt)
 545                 return NULL;
 546
 547         INIT_LIST_HEAD(&rt->list);
 548         refcount_set(&rt->refs, 1);
 549         rt->output = mctp_route_discard;
 550
 551         return rt;
 552 }
 553
 554 unsigned int mctp_default_net(struct net *net)
 555 {
 556         return READ_ONCE(net->mctp.default_net);
 557 }
 558
 559 int mctp_default_net_set(struct net *net, unsigned int index)
 560 {
 561         if (index == 0)
 562                 return -EINVAL;
 563         WRITE_ONCE(net->mctp.default_net, index);
 564         return 0;
 565 }
 566
 567 /* tag management */
 568 static void mctp_reserve_tag(struct net *net, struct mctp_sk_key *key,
 569                              struct mctp_sock *msk)
 570 {
 571         struct netns_mctp *mns = &net->mctp;
 572
 573         lockdep_assert_held(&mns->keys_lock);
 574
 575         key->expiry = jiffies + mctp_key_lifetime;
 576         timer_reduce(&msk->key_expiry, key->expiry);
 577
 578         /* we hold the net->key_lock here, allowing updates to both
 579          * then net and sk
 580          */
 581         hlist_add_head_rcu(&key->hlist, &mns->keys);
 582         hlist_add_head_rcu(&key->sklist, &msk->keys);
 583         refcount_inc(&key->refs);
 584 }
 585
 586 /* Allocate a locally-owned tag value for (saddr, daddr), and reserve
 587  * it for the socket msk
 588  */
 589 struct mctp_sk_key *mctp_alloc_local_tag(struct mctp_sock *msk,
 590                                          mctp_eid_t daddr, mctp_eid_t saddr,
 591                                          bool manual, u8 *tagp)
 592 {
 593         struct net *net = sock_net(&msk->sk);
 594         struct netns_mctp *mns = &net->mctp;
 595         struct mctp_sk_key *key, *tmp;
 596         unsigned long flags;
 597         u8 tagbits;
 598
 599         /* for NULL destination EIDs, we may get a response from any peer */
 600         if (daddr == MCTP_ADDR_NULL)
 601                 daddr = MCTP_ADDR_ANY;
 602
 603         /* be optimistic, alloc now */
 604         key = mctp_key_alloc(msk, saddr, daddr, 0, GFP_KERNEL);
 605         if (!key)
 606                 return ERR_PTR(-ENOMEM);
 607
 608         /* 8 possible tag values */
 609         tagbits = 0xff;
 610
 611         spin_lock_irqsave(&mns->keys_lock, flags);
 612
 613         /* Walk through the existing keys, looking for potential conflicting
 614          * tags. If we find a conflict, clear that bit from tagbits
 615          */
 616         hlist_for_each_entry(tmp, &mns->keys, hlist) {
 617                 /* We can check the lookup fields (*_addr, tag) without the
 618                  * lock held, they don't change over the lifetime of the key.
 619                  */
 620
 621                 /* if we don't own the tag, it can't conflict */
 622                 if (tmp->tag & MCTP_HDR_FLAG_TO)
 623                         continue;
 624
 625                 if (!(mctp_address_matches(tmp->peer_addr, daddr) &&
 626                       mctp_address_matches(tmp->local_addr, saddr)))
 627                         continue;
 628
 629                 spin_lock(&tmp->lock);
 630                 /* key must still be valid. If we find a match, clear the
 631                  * potential tag value
 632                  */
 633                 if (tmp->valid)
 634                         tagbits &= ~(1 << tmp->tag);
 635                 spin_unlock(&tmp->lock);
 636
 637                 if (!tagbits)
 638                         break;
 639         }
 640
 641         if (tagbits) {
 642                 key->tag = __ffs(tagbits);
 643                 mctp_reserve_tag(net, key, msk);
 644                 trace_mctp_key_acquire(key);
 645
 646                 key->manual_alloc = manual;
 647                 *tagp = key->tag;
 648         }
 649
 650         spin_unlock_irqrestore(&mns->keys_lock, flags);
 651
 652         if (!tagbits) {
 653                 kfree(key);
 654                 return ERR_PTR(-EBUSY);
 655         }
 656
 657         return key;
 658 }
 659
 660 static struct mctp_sk_key *mctp_lookup_prealloc_tag(struct mctp_sock *msk,
 661                                                     mctp_eid_t daddr,
 662                                                     u8 req_tag, u8 *tagp)
 663 {
 664         struct net *net = sock_net(&msk->sk);
 665         struct netns_mctp *mns = &net->mctp;
 666         struct mctp_sk_key *key, *tmp;
 667         unsigned long flags;
 668
 669         req_tag &= ~(MCTP_TAG_PREALLOC | MCTP_TAG_OWNER);
 670         key = NULL;
 671
 672         spin_lock_irqsave(&mns->keys_lock, flags);
 673
 674         hlist_for_each_entry(tmp, &mns->keys, hlist) {
 675                 if (tmp->tag != req_tag)
 676                         continue;
 677
 678                 if (!mctp_address_matches(tmp->peer_addr, daddr))
 679                         continue;
 680
 681                 if (!tmp->manual_alloc)
 682                         continue;
 683
 684                 spin_lock(&tmp->lock);
 685                 if (tmp->valid) {
 686                         key = tmp;
 687                         refcount_inc(&key->refs);
 688                         spin_unlock(&tmp->lock);
 689                         break;
 690                 }
 691                 spin_unlock(&tmp->lock);
 692         }
 693         spin_unlock_irqrestore(&mns->keys_lock, flags);
 694
 695         if (!key)
 696                 return ERR_PTR(-ENOENT);
 697
 698         if (tagp)
 699                 *tagp = key->tag;
 700
 701         return key;
 702 }
 703
 704 /* routing lookups */
 705 static bool mctp_rt_match_eid(struct mctp_route *rt,
 706                               unsigned int net, mctp_eid_t eid)
 707 {
 708         return READ_ONCE(rt->dev->net) == net &&
 709                 rt->min <= eid && rt->max >= eid;
 710 }
 711
 712 /* compares match, used for duplicate prevention */
 713 static bool mctp_rt_compare_exact(struct mctp_route *rt1,
 714                                   struct mctp_route *rt2)
 715 {
 716         ASSERT_RTNL();
 717         return rt1->dev->net == rt2->dev->net &&
 718                 rt1->min == rt2->min &&
 719                 rt1->max == rt2->max;
 720 }
 721
 722 struct mctp_route *mctp_route_lookup(struct net *net, unsigned int dnet,
 723                                      mctp_eid_t daddr)
 724 {
 725         struct mctp_route *tmp, *rt = NULL;
 726
 727         list_for_each_entry_rcu(tmp, &net->mctp.routes, list) {
 728                 /* TODO: add metrics */
 729                 if (mctp_rt_match_eid(tmp, dnet, daddr)) {
 730                         if (refcount_inc_not_zero(&tmp->refs)) {
 731                                 rt = tmp;
 732                                 break;
 733                         }
 734                 }
 735         }
 736
 737         return rt;
 738 }
 739
 740 static struct mctp_route *mctp_route_lookup_null(struct net *net,
 741                                                  struct net_device *dev)
 742 {
 743         struct mctp_route *rt;
 744
 745         list_for_each_entry_rcu(rt, &net->mctp.routes, list) {
 746                 if (rt->dev->dev == dev && rt->type == RTN_LOCAL &&
 747                     refcount_inc_not_zero(&rt->refs))
 748                         return rt;
 749         }
 750
 751         return NULL;
 752 }
 753
 754 static int mctp_do_fragment_route(struct mctp_route *rt, struct sk_buff *skb,
 755                                   unsigned int mtu, u8 tag)
 756 {
 757         const unsigned int hlen = sizeof(struct mctp_hdr);
 758         struct mctp_hdr *hdr, *hdr2;
 759         unsigned int pos, size;
 760         struct sk_buff *skb2;
 761         int rc;
 762         u8 seq;
 763
 764         hdr = mctp_hdr(skb);
 765         seq = 0;
 766         rc = 0;
 767
 768         if (mtu < hlen + 1) {
 769                 kfree_skb(skb);
 770                 return -EMSGSIZE;
 771         }
 772
 773         /* we've got the header */
 774         skb_pull(skb, hlen);
 775
 776         for (pos = 0; pos < skb->len;) {
 777                 /* size of message payload */
 778                 size = min(mtu - hlen, skb->len - pos);
 779
 780                 skb2 = alloc_skb(MCTP_HEADER_MAXLEN + hlen + size, GFP_KERNEL);
 781                 if (!skb2) {
 782                         rc = -ENOMEM;
 783                         break;
 784                 }
 785
 786                 /* generic skb copy */
 787                 skb2->protocol = skb->protocol;
 788                 skb2->priority = skb->priority;
 789                 skb2->dev = skb->dev;
 790                 memcpy(skb2->cb, skb->cb, sizeof(skb2->cb));
 791
 792                 if (skb->sk)
 793                         skb_set_owner_w(skb2, skb->sk);
 794
 795                 /* establish packet */
 796                 skb_reserve(skb2, MCTP_HEADER_MAXLEN);
 797                 skb_reset_network_header(skb2);
 798                 skb_put(skb2, hlen + size);
 799                 skb2->transport_header = skb2->network_header + hlen;
 800
 801                 /* copy header fields, calculate SOM/EOM flags & seq */
 802                 hdr2 = mctp_hdr(skb2);
 803                 hdr2->ver = hdr->ver;
 804                 hdr2->dest = hdr->dest;
 805                 hdr2->src = hdr->src;
 806                 hdr2->flags_seq_tag = tag &
 807                         (MCTP_HDR_TAG_MASK | MCTP_HDR_FLAG_TO);
 808
 809                 if (pos == 0)
 810                         hdr2->flags_seq_tag |= MCTP_HDR_FLAG_SOM;
 811
 812                 if (pos + size == skb->len)
 813                         hdr2->flags_seq_tag |= MCTP_HDR_FLAG_EOM;
 814
 815                 hdr2->flags_seq_tag |= seq << MCTP_HDR_SEQ_SHIFT;
 816
 817                 /* copy message payload */
 818                 skb_copy_bits(skb, pos, skb_transport_header(skb2), size);
 819
 820                 /* do route */
 821                 rc = rt->output(rt, skb2);
 822                 if (rc)
 823                         break;
 824
 825                 seq = (seq + 1) & MCTP_HDR_SEQ_MASK;
 826                 pos += size;
 827         }
 828
 829         consume_skb(skb);
 830         return rc;
 831 }
 832
 833 int mctp_local_output(struct sock *sk, struct mctp_route *rt,
 834                       struct sk_buff *skb, mctp_eid_t daddr, u8 req_tag)
 835 {
 836         struct mctp_sock *msk = container_of(sk, struct mctp_sock, sk);
 837         struct mctp_skb_cb *cb = mctp_cb(skb);
 838         struct mctp_route tmp_rt = {0};
 839         struct mctp_sk_key *key;
 840         struct mctp_hdr *hdr;
 841         unsigned long flags;
 842         unsigned int mtu;
 843         mctp_eid_t saddr;
 844         bool ext_rt;
 845         int rc;
 846         u8 tag;
 847
 848         rc = -ENODEV;
 849
 850         if (rt) {
 851                 ext_rt = false;
 852                 if (WARN_ON(!rt->dev))
 853                         goto out_release;
 854
 855         } else if (cb->ifindex) {
 856                 struct net_device *dev;
 857
 858                 ext_rt = true;
 859                 rt = &tmp_rt;
 860
 861                 rcu_read_lock();
 862                 dev = dev_get_by_index_rcu(sock_net(sk), cb->ifindex);
 863                 if (!dev) {
 864                         rcu_read_unlock();
 865                         return rc;
 866                 }
 867                 rt->dev = __mctp_dev_get(dev);
 868                 rcu_read_unlock();
 869
 870                 if (!rt->dev)
 871                         goto out_release;
 872
 873                 /* establish temporary route - we set up enough to keep
 874                  * mctp_route_output happy
 875                  */
 876                 rt->output = mctp_route_output;
 877                 rt->mtu = 0;
 878
 879         } else {
 880                 return -EINVAL;
 881         }
 882
 883         spin_lock_irqsave(&rt->dev->addrs_lock, flags);
 884         if (rt->dev->num_addrs == 0) {
 885                 rc = -EHOSTUNREACH;
 886         } else {
 887                 /* use the outbound interface's first address as our source */
 888                 saddr = rt->dev->addrs[0];
 889                 rc = 0;
 890         }
 891         spin_unlock_irqrestore(&rt->dev->addrs_lock, flags);
 892
 893         if (rc)
 894                 goto out_release;
 895
 896         if (req_tag & MCTP_TAG_OWNER) {
 897                 if (req_tag & MCTP_TAG_PREALLOC)
 898                         key = mctp_lookup_prealloc_tag(msk, daddr,
 899                                                        req_tag, &tag);
 900                 else
 901                         key = mctp_alloc_local_tag(msk, daddr, saddr,
 902                                                    false, &tag);
 903
 904                 if (IS_ERR(key)) {
 905                         rc = PTR_ERR(key);
 906                         goto out_release;
 907                 }
 908                 mctp_skb_set_flow(skb, key);
 909                 /* done with the key in this scope */
 910                 mctp_key_unref(key);
 911                 tag |= MCTP_HDR_FLAG_TO;
 912         } else {
 913                 key = NULL;
 914                 tag = req_tag & MCTP_TAG_MASK;
 915         }
 916
 917         skb->protocol = htons(ETH_P_MCTP);
 918         skb->priority = 0;
 919         skb_reset_transport_header(skb);
 920         skb_push(skb, sizeof(struct mctp_hdr));
 921         skb_reset_network_header(skb);
 922         skb->dev = rt->dev->dev;
 923
 924         /* cb->net will have been set on initial ingress */
 925         cb->src = saddr;
 926
 927         /* set up common header fields */
 928         hdr = mctp_hdr(skb);
 929         hdr->ver = 1;
 930         hdr->dest = daddr;
 931         hdr->src = saddr;
 932
 933         mtu = mctp_route_mtu(rt);
 934
 935         if (skb->len + sizeof(struct mctp_hdr) <= mtu) {
 936                 hdr->flags_seq_tag = MCTP_HDR_FLAG_SOM |
 937                         MCTP_HDR_FLAG_EOM | tag;
 938                 rc = rt->output(rt, skb);
 939         } else {
 940                 rc = mctp_do_fragment_route(rt, skb, mtu, tag);
 941         }
 942
 943 out_release:
 944         if (!ext_rt)
 945                 mctp_route_release(rt);
 946
 947         mctp_dev_put(tmp_rt.dev);
 948
 949         return rc;
 950 }
 951
 952 /* route management */
 953 static int mctp_route_add(struct mctp_dev *mdev, mctp_eid_t daddr_start,
 954                           unsigned int daddr_extent, unsigned int mtu,
 955                           unsigned char type)
 956 {
 957         int (*rtfn)(struct mctp_route *rt, struct sk_buff *skb);
 958         struct net *net = dev_net(mdev->dev);
 959         struct mctp_route *rt, *ert;
 960
 961         if (!mctp_address_unicast(daddr_start))
 962                 return -EINVAL;
 963
 964         if (daddr_extent > 0xff || daddr_start + daddr_extent >= 255)
 965                 return -EINVAL;
 966
 967         switch (type) {
 968         case RTN_LOCAL:
 969                 rtfn = mctp_route_input;
 970                 break;
 971         case RTN_UNICAST:
 972                 rtfn = mctp_route_output;
 973                 break;
 974         default:
 975                 return -EINVAL;
 976         }
 977
 978         rt = mctp_route_alloc();
 979         if (!rt)
 980                 return -ENOMEM;
 981
 982         rt->min = daddr_start;
 983         rt->max = daddr_start + daddr_extent;
 984         rt->mtu = mtu;
 985         rt->dev = mdev;
 986         mctp_dev_hold(rt->dev);
 987         rt->type = type;
 988         rt->output = rtfn;
 989
 990         ASSERT_RTNL();
 991         /* Prevent duplicate identical routes. */
 992         list_for_each_entry(ert, &net->mctp.routes, list) {
 993                 if (mctp_rt_compare_exact(rt, ert)) {
 994                         mctp_route_release(rt);
 995                         return -EEXIST;
 996                 }
 997         }
 998
 999         list_add_rcu(&rt->list, &net->mctp.routes);
1000
1001         return 0;
1002 }
1003
1004 static int mctp_route_remove(struct mctp_dev *mdev, mctp_eid_t daddr_start,
1005                              unsigned int daddr_extent, unsigned char type)
1006 {
1007         struct net *net = dev_net(mdev->dev);
1008         struct mctp_route *rt, *tmp;
1009         mctp_eid_t daddr_end;
1010         bool dropped;
1011
1012         if (daddr_extent > 0xff || daddr_start + daddr_extent >= 255)
1013                 return -EINVAL;
1014
1015         daddr_end = daddr_start + daddr_extent;
1016         dropped = false;
1017
1018         ASSERT_RTNL();
1019
1020         list_for_each_entry_safe(rt, tmp, &net->mctp.routes, list) {
1021                 if (rt->dev == mdev &&
1022                     rt->min == daddr_start && rt->max == daddr_end &&
1023                     rt->type == type) {
1024                         list_del_rcu(&rt->list);
1025                         /* TODO: immediate RTM_DELROUTE */
1026                         mctp_route_release(rt);
1027                         dropped = true;
1028                 }
1029         }
1030
1031         return dropped ? 0 : -ENOENT;
1032 }
1033
1034 int mctp_route_add_local(struct mctp_dev *mdev, mctp_eid_t addr)
1035 {
1036         return mctp_route_add(mdev, addr, 0, 0, RTN_LOCAL);
1037 }
1038
1039 int mctp_route_remove_local(struct mctp_dev *mdev, mctp_eid_t addr)
1040 {
1041         return mctp_route_remove(mdev, addr, 0, RTN_LOCAL);
1042 }
1043
1044 /* removes all entries for a given device */
1045 void mctp_route_remove_dev(struct mctp_dev *mdev)
1046 {
1047         struct net *net = dev_net(mdev->dev);
1048         struct mctp_route *rt, *tmp;
1049
1050         ASSERT_RTNL();
1051         list_for_each_entry_safe(rt, tmp, &net->mctp.routes, list) {
1052                 if (rt->dev == mdev) {
1053                         list_del_rcu(&rt->list);
1054                         /* TODO: immediate RTM_DELROUTE */
1055                         mctp_route_release(rt);
1056                 }
1057         }
1058 }
1059
1060 /* Incoming packet-handling */
1061
1062 static int mctp_pkttype_receive(struct sk_buff *skb, struct net_device *dev,
1063                                 struct packet_type *pt,
1064                                 struct net_device *orig_dev)
1065 {
1066         struct net *net = dev_net(dev);
1067         struct mctp_dev *mdev;
1068         struct mctp_skb_cb *cb;
1069         struct mctp_route *rt;
1070         struct mctp_hdr *mh;
1071
1072         rcu_read_lock();
1073         mdev = __mctp_dev_get(dev);
1074         rcu_read_unlock();
1075         if (!mdev) {
1076                 /* basic non-data sanity checks */
1077                 goto err_drop;
1078         }
1079
1080         if (!pskb_may_pull(skb, sizeof(struct mctp_hdr)))
1081                 goto err_drop;
1082
1083         skb_reset_transport_header(skb);
1084         skb_reset_network_header(skb);
1085
1086         /* We have enough for a header; decode and route */
1087         mh = mctp_hdr(skb);
1088         if (mh->ver < MCTP_VER_MIN || mh->ver > MCTP_VER_MAX)
1089                 goto err_drop;
1090
1091         /* source must be valid unicast or null; drop reserved ranges and
1092          * broadcast
1093          */
1094         if (!(mctp_address_unicast(mh->src) || mctp_address_null(mh->src)))
1095                 goto err_drop;
1096
1097         /* dest address: as above, but allow broadcast */
1098         if (!(mctp_address_unicast(mh->dest) || mctp_address_null(mh->dest) ||
1099               mctp_address_broadcast(mh->dest)))
1100                 goto err_drop;
1101
1102         /* MCTP drivers must populate halen/haddr */
1103         if (dev->type == ARPHRD_MCTP) {
1104                 cb = mctp_cb(skb);
1105         } else {
1106                 cb = __mctp_cb(skb);
1107                 cb->halen = 0;
1108         }
1109         cb->net = READ_ONCE(mdev->net);
1110         cb->ifindex = dev->ifindex;
1111
1112         rt = mctp_route_lookup(net, cb->net, mh->dest);
1113
1114         /* NULL EID, but addressed to our physical address */
1115         if (!rt && mh->dest == MCTP_ADDR_NULL && skb->pkt_type == PACKET_HOST)
1116                 rt = mctp_route_lookup_null(net, dev);
1117
1118         if (!rt)
1119                 goto err_drop;
1120
1121         rt->output(rt, skb);
1122         mctp_route_release(rt);
1123         mctp_dev_put(mdev);
1124
1125         return NET_RX_SUCCESS;
1126
1127 err_drop:
1128         kfree_skb(skb);
1129         mctp_dev_put(mdev);
1130         return NET_RX_DROP;
1131 }
1132
1133 static struct packet_type mctp_packet_type = {
1134         .type = cpu_to_be16(ETH_P_MCTP),
1135         .func = mctp_pkttype_receive,
1136 };
1137
1138 /* netlink interface */
1139
1140 static const struct nla_policy rta_mctp_policy[RTA_MAX + 1] = {
1141         [RTA_DST]               = { .type = NLA_U8 },
1142         [RTA_METRICS]           = { .type = NLA_NESTED },
1143         [RTA_OIF]               = { .type = NLA_U32 },
1144 };
1145
1146 /* Common part for RTM_NEWROUTE and RTM_DELROUTE parsing.
1147  * tb must hold RTA_MAX+1 elements.
1148  */
1149 static int mctp_route_nlparse(struct sk_buff *skb, struct nlmsghdr *nlh,
1150                               struct netlink_ext_ack *extack,
1151                               struct nlattr **tb, struct rtmsg **rtm,
1152                               struct mctp_dev **mdev, mctp_eid_t *daddr_start)
1153 {
1154         struct net *net = sock_net(skb->sk);
1155         struct net_device *dev;
1156         unsigned int ifindex;
1157         int rc;
1158
1159         rc = nlmsg_parse(nlh, sizeof(struct rtmsg), tb, RTA_MAX,
1160                          rta_mctp_policy, extack);
1161         if (rc < 0) {
1162                 NL_SET_ERR_MSG(extack, "incorrect format");
1163                 return rc;
1164         }
1165
1166         if (!tb[RTA_DST]) {
1167                 NL_SET_ERR_MSG(extack, "dst EID missing");
1168                 return -EINVAL;
1169         }
1170         *daddr_start = nla_get_u8(tb[RTA_DST]);
1171
1172         if (!tb[RTA_OIF]) {
1173                 NL_SET_ERR_MSG(extack, "ifindex missing");
1174                 return -EINVAL;
1175         }
1176         ifindex = nla_get_u32(tb[RTA_OIF]);
1177
1178         *rtm = nlmsg_data(nlh);
1179         if ((*rtm)->rtm_family != AF_MCTP) {
1180                 NL_SET_ERR_MSG(extack, "route family must be AF_MCTP");
1181                 return -EINVAL;
1182         }
1183
1184         dev = __dev_get_by_index(net, ifindex);
1185         if (!dev) {
1186                 NL_SET_ERR_MSG(extack, "bad ifindex");
1187                 return -ENODEV;
1188         }
1189         *mdev = mctp_dev_get_rtnl(dev);
1190         if (!*mdev)
1191                 return -ENODEV;
1192
1193         if (dev->flags & IFF_LOOPBACK) {
1194                 NL_SET_ERR_MSG(extack, "no routes to loopback");
1195                 return -EINVAL;
1196         }
1197
1198         return 0;
1199 }
1200
1201 static const struct nla_policy rta_metrics_policy[RTAX_MAX + 1] = {
1202         [RTAX_MTU]              = { .type = NLA_U32 },
1203 };
1204
1205 static int mctp_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
1206                          struct netlink_ext_ack *extack)
1207 {
1208         struct nlattr *tb[RTA_MAX + 1];
1209         struct nlattr *tbx[RTAX_MAX + 1];
1210         mctp_eid_t daddr_start;
1211         struct mctp_dev *mdev;
1212         struct rtmsg *rtm;
1213         unsigned int mtu;
1214         int rc;
1215
1216         rc = mctp_route_nlparse(skb, nlh, extack, tb,
1217                                 &rtm, &mdev, &daddr_start);
1218         if (rc < 0)
1219                 return rc;
1220
1221         if (rtm->rtm_type != RTN_UNICAST) {
1222                 NL_SET_ERR_MSG(extack, "rtm_type must be RTN_UNICAST");
1223                 return -EINVAL;
1224         }
1225
1226         mtu = 0;
1227         if (tb[RTA_METRICS]) {
1228                 rc = nla_parse_nested(tbx, RTAX_MAX, tb[RTA_METRICS],
1229                                       rta_metrics_policy, NULL);
1230                 if (rc < 0)
1231                         return rc;
1232                 if (tbx[RTAX_MTU])
1233                         mtu = nla_get_u32(tbx[RTAX_MTU]);
1234         }
1235
1236         if (rtm->rtm_type != RTN_UNICAST)
1237                 return -EINVAL;
1238
1239         rc = mctp_route_add(mdev, daddr_start, rtm->rtm_dst_len, mtu,
1240                             rtm->rtm_type);
1241         return rc;
1242 }
1243
1244 static int mctp_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
1245                          struct netlink_ext_ack *extack)
1246 {
1247         struct nlattr *tb[RTA_MAX + 1];
1248         mctp_eid_t daddr_start;
1249         struct mctp_dev *mdev;
1250         struct rtmsg *rtm;
1251         int rc;
1252
1253         rc = mctp_route_nlparse(skb, nlh, extack, tb,
1254                                 &rtm, &mdev, &daddr_start);
1255         if (rc < 0)
1256                 return rc;
1257
1258         /* we only have unicast routes */
1259         if (rtm->rtm_type != RTN_UNICAST)
1260                 return -EINVAL;
1261
1262         rc = mctp_route_remove(mdev, daddr_start, rtm->rtm_dst_len, RTN_UNICAST);
1263         return rc;
1264 }
1265
1266 static int mctp_fill_rtinfo(struct sk_buff *skb, struct mctp_route *rt,
1267                             u32 portid, u32 seq, int event, unsigned int flags)
1268 {
1269         struct nlmsghdr *nlh;
1270         struct rtmsg *hdr;
1271         void *metrics;
1272
1273         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
1274         if (!nlh)
1275                 return -EMSGSIZE;
1276
1277         hdr = nlmsg_data(nlh);
1278         hdr->rtm_family = AF_MCTP;
1279
1280         /* we use the _len fields as a number of EIDs, rather than
1281          * a number of bits in the address
1282          */
1283         hdr->rtm_dst_len = rt->max - rt->min;
1284         hdr->rtm_src_len = 0;
1285         hdr->rtm_tos = 0;
1286         hdr->rtm_table = RT_TABLE_DEFAULT;
1287         hdr->rtm_protocol = RTPROT_STATIC; /* everything is user-defined */
1288         hdr->rtm_scope = RT_SCOPE_LINK; /* TODO: scope in mctp_route? */
1289         hdr->rtm_type = rt->type;
1290
1291         if (nla_put_u8(skb, RTA_DST, rt->min))
1292                 goto cancel;
1293
1294         metrics = nla_nest_start_noflag(skb, RTA_METRICS);
1295         if (!metrics)
1296                 goto cancel;
1297
1298         if (rt->mtu) {
1299                 if (nla_put_u32(skb, RTAX_MTU, rt->mtu))
1300                         goto cancel;
1301         }
1302
1303         nla_nest_end(skb, metrics);
1304
1305         if (rt->dev) {
1306                 if (nla_put_u32(skb, RTA_OIF, rt->dev->dev->ifindex))
1307                         goto cancel;
1308         }
1309
1310         /* TODO: conditional neighbour physaddr? */
1311
1312         nlmsg_end(skb, nlh);
1313
1314         return 0;
1315
1316 cancel:
1317         nlmsg_cancel(skb, nlh);
1318         return -EMSGSIZE;
1319 }
1320
1321 static int mctp_dump_rtinfo(struct sk_buff *skb, struct netlink_callback *cb)
1322 {
1323         struct net *net = sock_net(skb->sk);
1324         struct mctp_route *rt;
1325         int s_idx, idx;
1326
1327         /* TODO: allow filtering on route data, possibly under
1328          * cb->strict_check
1329          */
1330
1331         /* TODO: change to struct overlay */
1332         s_idx = cb->args[0];
1333         idx = 0;
1334
1335         rcu_read_lock();
1336         list_for_each_entry_rcu(rt, &net->mctp.routes, list) {
1337                 if (idx++ < s_idx)
1338                         continue;
1339                 if (mctp_fill_rtinfo(skb, rt,
1340                                      NETLINK_CB(cb->skb).portid,
1341                                      cb->nlh->nlmsg_seq,
1342                                      RTM_NEWROUTE, NLM_F_MULTI) < 0)
1343                         break;
1344         }
1345
1346         rcu_read_unlock();
1347         cb->args[0] = idx;
1348
1349         return skb->len;
1350 }
1351
1352 /* net namespace implementation */
1353 static int __net_init mctp_routes_net_init(struct net *net)
1354 {
1355         struct netns_mctp *ns = &net->mctp;
1356
1357         INIT_LIST_HEAD(&ns->routes);
1358         INIT_HLIST_HEAD(&ns->binds);
1359         mutex_init(&ns->bind_lock);
1360         INIT_HLIST_HEAD(&ns->keys);
1361         spin_lock_init(&ns->keys_lock);
1362         WARN_ON(mctp_default_net_set(net, MCTP_INITIAL_DEFAULT_NET));
1363         return 0;
1364 }
1365
1366 static void __net_exit mctp_routes_net_exit(struct net *net)
1367 {
1368         struct mctp_route *rt;
1369
1370         rcu_read_lock();
1371         list_for_each_entry_rcu(rt, &net->mctp.routes, list)
1372                 mctp_route_release(rt);
1373         rcu_read_unlock();
1374 }
1375
1376 static struct pernet_operations mctp_net_ops = {
1377         .init = mctp_routes_net_init,
1378         .exit = mctp_routes_net_exit,
1379 };
1380
1381 int __init mctp_routes_init(void)
1382 {
1383         dev_add_pack(&mctp_packet_type);
1384
1385         rtnl_register_module(THIS_MODULE, PF_MCTP, RTM_GETROUTE,
1386                              NULL, mctp_dump_rtinfo, 0);
1387         rtnl_register_module(THIS_MODULE, PF_MCTP, RTM_NEWROUTE,
1388                              mctp_newroute, NULL, 0);
1389         rtnl_register_module(THIS_MODULE, PF_MCTP, RTM_DELROUTE,
1390                              mctp_delroute, NULL, 0);
1391
1392         return register_pernet_subsys(&mctp_net_ops);
1393 }
1394
1395 void __exit mctp_routes_exit(void)
1396 {
1397         unregister_pernet_subsys(&mctp_net_ops);
1398         rtnl_unregister(PF_MCTP, RTM_DELROUTE);
1399         rtnl_unregister(PF_MCTP, RTM_NEWROUTE);
1400         rtnl_unregister(PF_MCTP, RTM_GETROUTE);
1401         dev_remove_pack(&mctp_packet_type);
1402 }
1403
1404 #if IS_ENABLED(CONFIG_MCTP_TEST)
1405 #include "test/route-test.c"
1406 #endif