xref: /openbmc/linux/net/mctp/route.c (revision a6ad1a10)
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 			msk = container_of(key->sk, struct mctp_sock, sk);
460 			sock_queue_rcv_skb(key->sk, key->reasm_head);
461 			key->reasm_head = NULL;
462 			__mctp_key_done_in(key, net, f, MCTP_TRACE_KEY_REPLIED);
463 			key = NULL;
464 		}
465 
466 	} else {
467 		/* not a start, no matching key */
468 		rc = -ENOENT;
469 	}
470 
471 out_unlock:
472 	rcu_read_unlock();
473 	if (key) {
474 		spin_unlock_irqrestore(&key->lock, f);
475 		mctp_key_unref(key);
476 	}
477 out:
478 	if (rc)
479 		kfree_skb(skb);
480 	return rc;
481 }
482 
483 static unsigned int mctp_route_mtu(struct mctp_route *rt)
484 {
485 	return rt->mtu ?: READ_ONCE(rt->dev->dev->mtu);
486 }
487 
488 static int mctp_route_output(struct mctp_route *route, struct sk_buff *skb)
489 {
490 	struct mctp_skb_cb *cb = mctp_cb(skb);
491 	struct mctp_hdr *hdr = mctp_hdr(skb);
492 	char daddr_buf[MAX_ADDR_LEN];
493 	char *daddr = NULL;
494 	unsigned int mtu;
495 	int rc;
496 
497 	skb->protocol = htons(ETH_P_MCTP);
498 
499 	mtu = READ_ONCE(skb->dev->mtu);
500 	if (skb->len > mtu) {
501 		kfree_skb(skb);
502 		return -EMSGSIZE;
503 	}
504 
505 	if (cb->ifindex) {
506 		/* direct route; use the hwaddr we stashed in sendmsg */
507 		daddr = cb->haddr;
508 	} else {
509 		/* If lookup fails let the device handle daddr==NULL */
510 		if (mctp_neigh_lookup(route->dev, hdr->dest, daddr_buf) == 0)
511 			daddr = daddr_buf;
512 	}
513 
514 	rc = dev_hard_header(skb, skb->dev, ntohs(skb->protocol),
515 			     daddr, skb->dev->dev_addr, skb->len);
516 	if (rc) {
517 		kfree_skb(skb);
518 		return -EHOSTUNREACH;
519 	}
520 
521 	mctp_flow_prepare_output(skb, route->dev);
522 
523 	rc = dev_queue_xmit(skb);
524 	if (rc)
525 		rc = net_xmit_errno(rc);
526 
527 	return rc;
528 }
529 
530 /* route alloc/release */
531 static void mctp_route_release(struct mctp_route *rt)
532 {
533 	if (refcount_dec_and_test(&rt->refs)) {
534 		mctp_dev_put(rt->dev);
535 		kfree_rcu(rt, rcu);
536 	}
537 }
538 
539 /* returns a route with the refcount at 1 */
540 static struct mctp_route *mctp_route_alloc(void)
541 {
542 	struct mctp_route *rt;
543 
544 	rt = kzalloc(sizeof(*rt), GFP_KERNEL);
545 	if (!rt)
546 		return NULL;
547 
548 	INIT_LIST_HEAD(&rt->list);
549 	refcount_set(&rt->refs, 1);
550 	rt->output = mctp_route_discard;
551 
552 	return rt;
553 }
554 
555 unsigned int mctp_default_net(struct net *net)
556 {
557 	return READ_ONCE(net->mctp.default_net);
558 }
559 
560 int mctp_default_net_set(struct net *net, unsigned int index)
561 {
562 	if (index == 0)
563 		return -EINVAL;
564 	WRITE_ONCE(net->mctp.default_net, index);
565 	return 0;
566 }
567 
568 /* tag management */
569 static void mctp_reserve_tag(struct net *net, struct mctp_sk_key *key,
570 			     struct mctp_sock *msk)
571 {
572 	struct netns_mctp *mns = &net->mctp;
573 
574 	lockdep_assert_held(&mns->keys_lock);
575 
576 	key->expiry = jiffies + mctp_key_lifetime;
577 	timer_reduce(&msk->key_expiry, key->expiry);
578 
579 	/* we hold the net->key_lock here, allowing updates to both
580 	 * then net and sk
581 	 */
582 	hlist_add_head_rcu(&key->hlist, &mns->keys);
583 	hlist_add_head_rcu(&key->sklist, &msk->keys);
584 	refcount_inc(&key->refs);
585 }
586 
587 /* Allocate a locally-owned tag value for (saddr, daddr), and reserve
588  * it for the socket msk
589  */
590 struct mctp_sk_key *mctp_alloc_local_tag(struct mctp_sock *msk,
591 					 mctp_eid_t daddr, mctp_eid_t saddr,
592 					 bool manual, u8 *tagp)
593 {
594 	struct net *net = sock_net(&msk->sk);
595 	struct netns_mctp *mns = &net->mctp;
596 	struct mctp_sk_key *key, *tmp;
597 	unsigned long flags;
598 	u8 tagbits;
599 
600 	/* for NULL destination EIDs, we may get a response from any peer */
601 	if (daddr == MCTP_ADDR_NULL)
602 		daddr = MCTP_ADDR_ANY;
603 
604 	/* be optimistic, alloc now */
605 	key = mctp_key_alloc(msk, saddr, daddr, 0, GFP_KERNEL);
606 	if (!key)
607 		return ERR_PTR(-ENOMEM);
608 
609 	/* 8 possible tag values */
610 	tagbits = 0xff;
611 
612 	spin_lock_irqsave(&mns->keys_lock, flags);
613 
614 	/* Walk through the existing keys, looking for potential conflicting
615 	 * tags. If we find a conflict, clear that bit from tagbits
616 	 */
617 	hlist_for_each_entry(tmp, &mns->keys, hlist) {
618 		/* We can check the lookup fields (*_addr, tag) without the
619 		 * lock held, they don't change over the lifetime of the key.
620 		 */
621 
622 		/* if we don't own the tag, it can't conflict */
623 		if (tmp->tag & MCTP_HDR_FLAG_TO)
624 			continue;
625 
626 		if (!(mctp_address_matches(tmp->peer_addr, daddr) &&
627 		      mctp_address_matches(tmp->local_addr, saddr)))
628 			continue;
629 
630 		spin_lock(&tmp->lock);
631 		/* key must still be valid. If we find a match, clear the
632 		 * potential tag value
633 		 */
634 		if (tmp->valid)
635 			tagbits &= ~(1 << tmp->tag);
636 		spin_unlock(&tmp->lock);
637 
638 		if (!tagbits)
639 			break;
640 	}
641 
642 	if (tagbits) {
643 		key->tag = __ffs(tagbits);
644 		mctp_reserve_tag(net, key, msk);
645 		trace_mctp_key_acquire(key);
646 
647 		key->manual_alloc = manual;
648 		*tagp = key->tag;
649 	}
650 
651 	spin_unlock_irqrestore(&mns->keys_lock, flags);
652 
653 	if (!tagbits) {
654 		kfree(key);
655 		return ERR_PTR(-EBUSY);
656 	}
657 
658 	return key;
659 }
660 
661 static struct mctp_sk_key *mctp_lookup_prealloc_tag(struct mctp_sock *msk,
662 						    mctp_eid_t daddr,
663 						    u8 req_tag, u8 *tagp)
664 {
665 	struct net *net = sock_net(&msk->sk);
666 	struct netns_mctp *mns = &net->mctp;
667 	struct mctp_sk_key *key, *tmp;
668 	unsigned long flags;
669 
670 	req_tag &= ~(MCTP_TAG_PREALLOC | MCTP_TAG_OWNER);
671 	key = NULL;
672 
673 	spin_lock_irqsave(&mns->keys_lock, flags);
674 
675 	hlist_for_each_entry(tmp, &mns->keys, hlist) {
676 		if (tmp->tag != req_tag)
677 			continue;
678 
679 		if (!mctp_address_matches(tmp->peer_addr, daddr))
680 			continue;
681 
682 		if (!tmp->manual_alloc)
683 			continue;
684 
685 		spin_lock(&tmp->lock);
686 		if (tmp->valid) {
687 			key = tmp;
688 			refcount_inc(&key->refs);
689 			spin_unlock(&tmp->lock);
690 			break;
691 		}
692 		spin_unlock(&tmp->lock);
693 	}
694 	spin_unlock_irqrestore(&mns->keys_lock, flags);
695 
696 	if (!key)
697 		return ERR_PTR(-ENOENT);
698 
699 	if (tagp)
700 		*tagp = key->tag;
701 
702 	return key;
703 }
704 
705 /* routing lookups */
706 static bool mctp_rt_match_eid(struct mctp_route *rt,
707 			      unsigned int net, mctp_eid_t eid)
708 {
709 	return READ_ONCE(rt->dev->net) == net &&
710 		rt->min <= eid && rt->max >= eid;
711 }
712 
713 /* compares match, used for duplicate prevention */
714 static bool mctp_rt_compare_exact(struct mctp_route *rt1,
715 				  struct mctp_route *rt2)
716 {
717 	ASSERT_RTNL();
718 	return rt1->dev->net == rt2->dev->net &&
719 		rt1->min == rt2->min &&
720 		rt1->max == rt2->max;
721 }
722 
723 struct mctp_route *mctp_route_lookup(struct net *net, unsigned int dnet,
724 				     mctp_eid_t daddr)
725 {
726 	struct mctp_route *tmp, *rt = NULL;
727 
728 	list_for_each_entry_rcu(tmp, &net->mctp.routes, list) {
729 		/* TODO: add metrics */
730 		if (mctp_rt_match_eid(tmp, dnet, daddr)) {
731 			if (refcount_inc_not_zero(&tmp->refs)) {
732 				rt = tmp;
733 				break;
734 			}
735 		}
736 	}
737 
738 	return rt;
739 }
740 
741 static struct mctp_route *mctp_route_lookup_null(struct net *net,
742 						 struct net_device *dev)
743 {
744 	struct mctp_route *rt;
745 
746 	list_for_each_entry_rcu(rt, &net->mctp.routes, list) {
747 		if (rt->dev->dev == dev && rt->type == RTN_LOCAL &&
748 		    refcount_inc_not_zero(&rt->refs))
749 			return rt;
750 	}
751 
752 	return NULL;
753 }
754 
755 static int mctp_do_fragment_route(struct mctp_route *rt, struct sk_buff *skb,
756 				  unsigned int mtu, u8 tag)
757 {
758 	const unsigned int hlen = sizeof(struct mctp_hdr);
759 	struct mctp_hdr *hdr, *hdr2;
760 	unsigned int pos, size;
761 	struct sk_buff *skb2;
762 	int rc;
763 	u8 seq;
764 
765 	hdr = mctp_hdr(skb);
766 	seq = 0;
767 	rc = 0;
768 
769 	if (mtu < hlen + 1) {
770 		kfree_skb(skb);
771 		return -EMSGSIZE;
772 	}
773 
774 	/* we've got the header */
775 	skb_pull(skb, hlen);
776 
777 	for (pos = 0; pos < skb->len;) {
778 		/* size of message payload */
779 		size = min(mtu - hlen, skb->len - pos);
780 
781 		skb2 = alloc_skb(MCTP_HEADER_MAXLEN + hlen + size, GFP_KERNEL);
782 		if (!skb2) {
783 			rc = -ENOMEM;
784 			break;
785 		}
786 
787 		/* generic skb copy */
788 		skb2->protocol = skb->protocol;
789 		skb2->priority = skb->priority;
790 		skb2->dev = skb->dev;
791 		memcpy(skb2->cb, skb->cb, sizeof(skb2->cb));
792 
793 		if (skb->sk)
794 			skb_set_owner_w(skb2, skb->sk);
795 
796 		/* establish packet */
797 		skb_reserve(skb2, MCTP_HEADER_MAXLEN);
798 		skb_reset_network_header(skb2);
799 		skb_put(skb2, hlen + size);
800 		skb2->transport_header = skb2->network_header + hlen;
801 
802 		/* copy header fields, calculate SOM/EOM flags & seq */
803 		hdr2 = mctp_hdr(skb2);
804 		hdr2->ver = hdr->ver;
805 		hdr2->dest = hdr->dest;
806 		hdr2->src = hdr->src;
807 		hdr2->flags_seq_tag = tag &
808 			(MCTP_HDR_TAG_MASK | MCTP_HDR_FLAG_TO);
809 
810 		if (pos == 0)
811 			hdr2->flags_seq_tag |= MCTP_HDR_FLAG_SOM;
812 
813 		if (pos + size == skb->len)
814 			hdr2->flags_seq_tag |= MCTP_HDR_FLAG_EOM;
815 
816 		hdr2->flags_seq_tag |= seq << MCTP_HDR_SEQ_SHIFT;
817 
818 		/* copy message payload */
819 		skb_copy_bits(skb, pos, skb_transport_header(skb2), size);
820 
821 		/* do route */
822 		rc = rt->output(rt, skb2);
823 		if (rc)
824 			break;
825 
826 		seq = (seq + 1) & MCTP_HDR_SEQ_MASK;
827 		pos += size;
828 	}
829 
830 	consume_skb(skb);
831 	return rc;
832 }
833 
834 int mctp_local_output(struct sock *sk, struct mctp_route *rt,
835 		      struct sk_buff *skb, mctp_eid_t daddr, u8 req_tag)
836 {
837 	struct mctp_sock *msk = container_of(sk, struct mctp_sock, sk);
838 	struct mctp_skb_cb *cb = mctp_cb(skb);
839 	struct mctp_route tmp_rt;
840 	struct mctp_sk_key *key;
841 	struct net_device *dev;
842 	struct mctp_hdr *hdr;
843 	unsigned long flags;
844 	unsigned int mtu;
845 	mctp_eid_t saddr;
846 	bool ext_rt;
847 	int rc;
848 	u8 tag;
849 
850 	rc = -ENODEV;
851 
852 	if (rt) {
853 		ext_rt = false;
854 		dev = NULL;
855 
856 		if (WARN_ON(!rt->dev))
857 			goto out_release;
858 
859 	} else if (cb->ifindex) {
860 		ext_rt = true;
861 		rt = &tmp_rt;
862 
863 		rcu_read_lock();
864 		dev = dev_get_by_index_rcu(sock_net(sk), cb->ifindex);
865 		if (!dev) {
866 			rcu_read_unlock();
867 			return rc;
868 		}
869 
870 		rt->dev = __mctp_dev_get(dev);
871 		rcu_read_unlock();
872 
873 		if (!rt->dev)
874 			goto out_release;
875 
876 		/* establish temporary route - we set up enough to keep
877 		 * mctp_route_output happy
878 		 */
879 		rt->output = mctp_route_output;
880 		rt->mtu = 0;
881 
882 	} else {
883 		return -EINVAL;
884 	}
885 
886 	spin_lock_irqsave(&rt->dev->addrs_lock, flags);
887 	if (rt->dev->num_addrs == 0) {
888 		rc = -EHOSTUNREACH;
889 	} else {
890 		/* use the outbound interface's first address as our source */
891 		saddr = rt->dev->addrs[0];
892 		rc = 0;
893 	}
894 	spin_unlock_irqrestore(&rt->dev->addrs_lock, flags);
895 
896 	if (rc)
897 		goto out_release;
898 
899 	if (req_tag & MCTP_TAG_OWNER) {
900 		if (req_tag & MCTP_TAG_PREALLOC)
901 			key = mctp_lookup_prealloc_tag(msk, daddr,
902 						       req_tag, &tag);
903 		else
904 			key = mctp_alloc_local_tag(msk, daddr, saddr,
905 						   false, &tag);
906 
907 		if (IS_ERR(key)) {
908 			rc = PTR_ERR(key);
909 			goto out_release;
910 		}
911 		mctp_skb_set_flow(skb, key);
912 		/* done with the key in this scope */
913 		mctp_key_unref(key);
914 		tag |= MCTP_HDR_FLAG_TO;
915 	} else {
916 		key = NULL;
917 		tag = req_tag & MCTP_TAG_MASK;
918 	}
919 
920 	skb->protocol = htons(ETH_P_MCTP);
921 	skb->priority = 0;
922 	skb_reset_transport_header(skb);
923 	skb_push(skb, sizeof(struct mctp_hdr));
924 	skb_reset_network_header(skb);
925 	skb->dev = rt->dev->dev;
926 
927 	/* cb->net will have been set on initial ingress */
928 	cb->src = saddr;
929 
930 	/* set up common header fields */
931 	hdr = mctp_hdr(skb);
932 	hdr->ver = 1;
933 	hdr->dest = daddr;
934 	hdr->src = saddr;
935 
936 	mtu = mctp_route_mtu(rt);
937 
938 	if (skb->len + sizeof(struct mctp_hdr) <= mtu) {
939 		hdr->flags_seq_tag = MCTP_HDR_FLAG_SOM |
940 			MCTP_HDR_FLAG_EOM | tag;
941 		rc = rt->output(rt, skb);
942 	} else {
943 		rc = mctp_do_fragment_route(rt, skb, mtu, tag);
944 	}
945 
946 out_release:
947 	if (!ext_rt)
948 		mctp_route_release(rt);
949 
950 	dev_put(dev);
951 
952 	return rc;
953 
954 }
955 
956 /* route management */
957 static int mctp_route_add(struct mctp_dev *mdev, mctp_eid_t daddr_start,
958 			  unsigned int daddr_extent, unsigned int mtu,
959 			  unsigned char type)
960 {
961 	int (*rtfn)(struct mctp_route *rt, struct sk_buff *skb);
962 	struct net *net = dev_net(mdev->dev);
963 	struct mctp_route *rt, *ert;
964 
965 	if (!mctp_address_unicast(daddr_start))
966 		return -EINVAL;
967 
968 	if (daddr_extent > 0xff || daddr_start + daddr_extent >= 255)
969 		return -EINVAL;
970 
971 	switch (type) {
972 	case RTN_LOCAL:
973 		rtfn = mctp_route_input;
974 		break;
975 	case RTN_UNICAST:
976 		rtfn = mctp_route_output;
977 		break;
978 	default:
979 		return -EINVAL;
980 	}
981 
982 	rt = mctp_route_alloc();
983 	if (!rt)
984 		return -ENOMEM;
985 
986 	rt->min = daddr_start;
987 	rt->max = daddr_start + daddr_extent;
988 	rt->mtu = mtu;
989 	rt->dev = mdev;
990 	mctp_dev_hold(rt->dev);
991 	rt->type = type;
992 	rt->output = rtfn;
993 
994 	ASSERT_RTNL();
995 	/* Prevent duplicate identical routes. */
996 	list_for_each_entry(ert, &net->mctp.routes, list) {
997 		if (mctp_rt_compare_exact(rt, ert)) {
998 			mctp_route_release(rt);
999 			return -EEXIST;
1000 		}
1001 	}
1002 
1003 	list_add_rcu(&rt->list, &net->mctp.routes);
1004 
1005 	return 0;
1006 }
1007 
1008 static int mctp_route_remove(struct mctp_dev *mdev, mctp_eid_t daddr_start,
1009 			     unsigned int daddr_extent, unsigned char type)
1010 {
1011 	struct net *net = dev_net(mdev->dev);
1012 	struct mctp_route *rt, *tmp;
1013 	mctp_eid_t daddr_end;
1014 	bool dropped;
1015 
1016 	if (daddr_extent > 0xff || daddr_start + daddr_extent >= 255)
1017 		return -EINVAL;
1018 
1019 	daddr_end = daddr_start + daddr_extent;
1020 	dropped = false;
1021 
1022 	ASSERT_RTNL();
1023 
1024 	list_for_each_entry_safe(rt, tmp, &net->mctp.routes, list) {
1025 		if (rt->dev == mdev &&
1026 		    rt->min == daddr_start && rt->max == daddr_end &&
1027 		    rt->type == type) {
1028 			list_del_rcu(&rt->list);
1029 			/* TODO: immediate RTM_DELROUTE */
1030 			mctp_route_release(rt);
1031 			dropped = true;
1032 		}
1033 	}
1034 
1035 	return dropped ? 0 : -ENOENT;
1036 }
1037 
1038 int mctp_route_add_local(struct mctp_dev *mdev, mctp_eid_t addr)
1039 {
1040 	return mctp_route_add(mdev, addr, 0, 0, RTN_LOCAL);
1041 }
1042 
1043 int mctp_route_remove_local(struct mctp_dev *mdev, mctp_eid_t addr)
1044 {
1045 	return mctp_route_remove(mdev, addr, 0, RTN_LOCAL);
1046 }
1047 
1048 /* removes all entries for a given device */
1049 void mctp_route_remove_dev(struct mctp_dev *mdev)
1050 {
1051 	struct net *net = dev_net(mdev->dev);
1052 	struct mctp_route *rt, *tmp;
1053 
1054 	ASSERT_RTNL();
1055 	list_for_each_entry_safe(rt, tmp, &net->mctp.routes, list) {
1056 		if (rt->dev == mdev) {
1057 			list_del_rcu(&rt->list);
1058 			/* TODO: immediate RTM_DELROUTE */
1059 			mctp_route_release(rt);
1060 		}
1061 	}
1062 }
1063 
1064 /* Incoming packet-handling */
1065 
1066 static int mctp_pkttype_receive(struct sk_buff *skb, struct net_device *dev,
1067 				struct packet_type *pt,
1068 				struct net_device *orig_dev)
1069 {
1070 	struct net *net = dev_net(dev);
1071 	struct mctp_dev *mdev;
1072 	struct mctp_skb_cb *cb;
1073 	struct mctp_route *rt;
1074 	struct mctp_hdr *mh;
1075 
1076 	rcu_read_lock();
1077 	mdev = __mctp_dev_get(dev);
1078 	rcu_read_unlock();
1079 	if (!mdev) {
1080 		/* basic non-data sanity checks */
1081 		goto err_drop;
1082 	}
1083 
1084 	if (!pskb_may_pull(skb, sizeof(struct mctp_hdr)))
1085 		goto err_drop;
1086 
1087 	skb_reset_transport_header(skb);
1088 	skb_reset_network_header(skb);
1089 
1090 	/* We have enough for a header; decode and route */
1091 	mh = mctp_hdr(skb);
1092 	if (mh->ver < MCTP_VER_MIN || mh->ver > MCTP_VER_MAX)
1093 		goto err_drop;
1094 
1095 	/* source must be valid unicast or null; drop reserved ranges and
1096 	 * broadcast
1097 	 */
1098 	if (!(mctp_address_unicast(mh->src) || mctp_address_null(mh->src)))
1099 		goto err_drop;
1100 
1101 	/* dest address: as above, but allow broadcast */
1102 	if (!(mctp_address_unicast(mh->dest) || mctp_address_null(mh->dest) ||
1103 	      mctp_address_broadcast(mh->dest)))
1104 		goto err_drop;
1105 
1106 	/* MCTP drivers must populate halen/haddr */
1107 	if (dev->type == ARPHRD_MCTP) {
1108 		cb = mctp_cb(skb);
1109 	} else {
1110 		cb = __mctp_cb(skb);
1111 		cb->halen = 0;
1112 	}
1113 	cb->net = READ_ONCE(mdev->net);
1114 	cb->ifindex = dev->ifindex;
1115 
1116 	rt = mctp_route_lookup(net, cb->net, mh->dest);
1117 
1118 	/* NULL EID, but addressed to our physical address */
1119 	if (!rt && mh->dest == MCTP_ADDR_NULL && skb->pkt_type == PACKET_HOST)
1120 		rt = mctp_route_lookup_null(net, dev);
1121 
1122 	if (!rt)
1123 		goto err_drop;
1124 
1125 	rt->output(rt, skb);
1126 	mctp_route_release(rt);
1127 
1128 	return NET_RX_SUCCESS;
1129 
1130 err_drop:
1131 	kfree_skb(skb);
1132 	return NET_RX_DROP;
1133 }
1134 
1135 static struct packet_type mctp_packet_type = {
1136 	.type = cpu_to_be16(ETH_P_MCTP),
1137 	.func = mctp_pkttype_receive,
1138 };
1139 
1140 /* netlink interface */
1141 
1142 static const struct nla_policy rta_mctp_policy[RTA_MAX + 1] = {
1143 	[RTA_DST]		= { .type = NLA_U8 },
1144 	[RTA_METRICS]		= { .type = NLA_NESTED },
1145 	[RTA_OIF]		= { .type = NLA_U32 },
1146 };
1147 
1148 /* Common part for RTM_NEWROUTE and RTM_DELROUTE parsing.
1149  * tb must hold RTA_MAX+1 elements.
1150  */
1151 static int mctp_route_nlparse(struct sk_buff *skb, struct nlmsghdr *nlh,
1152 			      struct netlink_ext_ack *extack,
1153 			      struct nlattr **tb, struct rtmsg **rtm,
1154 			      struct mctp_dev **mdev, mctp_eid_t *daddr_start)
1155 {
1156 	struct net *net = sock_net(skb->sk);
1157 	struct net_device *dev;
1158 	unsigned int ifindex;
1159 	int rc;
1160 
1161 	rc = nlmsg_parse(nlh, sizeof(struct rtmsg), tb, RTA_MAX,
1162 			 rta_mctp_policy, extack);
1163 	if (rc < 0) {
1164 		NL_SET_ERR_MSG(extack, "incorrect format");
1165 		return rc;
1166 	}
1167 
1168 	if (!tb[RTA_DST]) {
1169 		NL_SET_ERR_MSG(extack, "dst EID missing");
1170 		return -EINVAL;
1171 	}
1172 	*daddr_start = nla_get_u8(tb[RTA_DST]);
1173 
1174 	if (!tb[RTA_OIF]) {
1175 		NL_SET_ERR_MSG(extack, "ifindex missing");
1176 		return -EINVAL;
1177 	}
1178 	ifindex = nla_get_u32(tb[RTA_OIF]);
1179 
1180 	*rtm = nlmsg_data(nlh);
1181 	if ((*rtm)->rtm_family != AF_MCTP) {
1182 		NL_SET_ERR_MSG(extack, "route family must be AF_MCTP");
1183 		return -EINVAL;
1184 	}
1185 
1186 	dev = __dev_get_by_index(net, ifindex);
1187 	if (!dev) {
1188 		NL_SET_ERR_MSG(extack, "bad ifindex");
1189 		return -ENODEV;
1190 	}
1191 	*mdev = mctp_dev_get_rtnl(dev);
1192 	if (!*mdev)
1193 		return -ENODEV;
1194 
1195 	if (dev->flags & IFF_LOOPBACK) {
1196 		NL_SET_ERR_MSG(extack, "no routes to loopback");
1197 		return -EINVAL;
1198 	}
1199 
1200 	return 0;
1201 }
1202 
1203 static const struct nla_policy rta_metrics_policy[RTAX_MAX + 1] = {
1204 	[RTAX_MTU]		= { .type = NLA_U32 },
1205 };
1206 
1207 static int mctp_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
1208 			 struct netlink_ext_ack *extack)
1209 {
1210 	struct nlattr *tb[RTA_MAX + 1];
1211 	struct nlattr *tbx[RTAX_MAX + 1];
1212 	mctp_eid_t daddr_start;
1213 	struct mctp_dev *mdev;
1214 	struct rtmsg *rtm;
1215 	unsigned int mtu;
1216 	int rc;
1217 
1218 	rc = mctp_route_nlparse(skb, nlh, extack, tb,
1219 				&rtm, &mdev, &daddr_start);
1220 	if (rc < 0)
1221 		return rc;
1222 
1223 	if (rtm->rtm_type != RTN_UNICAST) {
1224 		NL_SET_ERR_MSG(extack, "rtm_type must be RTN_UNICAST");
1225 		return -EINVAL;
1226 	}
1227 
1228 	mtu = 0;
1229 	if (tb[RTA_METRICS]) {
1230 		rc = nla_parse_nested(tbx, RTAX_MAX, tb[RTA_METRICS],
1231 				      rta_metrics_policy, NULL);
1232 		if (rc < 0)
1233 			return rc;
1234 		if (tbx[RTAX_MTU])
1235 			mtu = nla_get_u32(tbx[RTAX_MTU]);
1236 	}
1237 
1238 	if (rtm->rtm_type != RTN_UNICAST)
1239 		return -EINVAL;
1240 
1241 	rc = mctp_route_add(mdev, daddr_start, rtm->rtm_dst_len, mtu,
1242 			    rtm->rtm_type);
1243 	return rc;
1244 }
1245 
1246 static int mctp_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
1247 			 struct netlink_ext_ack *extack)
1248 {
1249 	struct nlattr *tb[RTA_MAX + 1];
1250 	mctp_eid_t daddr_start;
1251 	struct mctp_dev *mdev;
1252 	struct rtmsg *rtm;
1253 	int rc;
1254 
1255 	rc = mctp_route_nlparse(skb, nlh, extack, tb,
1256 				&rtm, &mdev, &daddr_start);
1257 	if (rc < 0)
1258 		return rc;
1259 
1260 	/* we only have unicast routes */
1261 	if (rtm->rtm_type != RTN_UNICAST)
1262 		return -EINVAL;
1263 
1264 	rc = mctp_route_remove(mdev, daddr_start, rtm->rtm_dst_len, RTN_UNICAST);
1265 	return rc;
1266 }
1267 
1268 static int mctp_fill_rtinfo(struct sk_buff *skb, struct mctp_route *rt,
1269 			    u32 portid, u32 seq, int event, unsigned int flags)
1270 {
1271 	struct nlmsghdr *nlh;
1272 	struct rtmsg *hdr;
1273 	void *metrics;
1274 
1275 	nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
1276 	if (!nlh)
1277 		return -EMSGSIZE;
1278 
1279 	hdr = nlmsg_data(nlh);
1280 	hdr->rtm_family = AF_MCTP;
1281 
1282 	/* we use the _len fields as a number of EIDs, rather than
1283 	 * a number of bits in the address
1284 	 */
1285 	hdr->rtm_dst_len = rt->max - rt->min;
1286 	hdr->rtm_src_len = 0;
1287 	hdr->rtm_tos = 0;
1288 	hdr->rtm_table = RT_TABLE_DEFAULT;
1289 	hdr->rtm_protocol = RTPROT_STATIC; /* everything is user-defined */
1290 	hdr->rtm_scope = RT_SCOPE_LINK; /* TODO: scope in mctp_route? */
1291 	hdr->rtm_type = rt->type;
1292 
1293 	if (nla_put_u8(skb, RTA_DST, rt->min))
1294 		goto cancel;
1295 
1296 	metrics = nla_nest_start_noflag(skb, RTA_METRICS);
1297 	if (!metrics)
1298 		goto cancel;
1299 
1300 	if (rt->mtu) {
1301 		if (nla_put_u32(skb, RTAX_MTU, rt->mtu))
1302 			goto cancel;
1303 	}
1304 
1305 	nla_nest_end(skb, metrics);
1306 
1307 	if (rt->dev) {
1308 		if (nla_put_u32(skb, RTA_OIF, rt->dev->dev->ifindex))
1309 			goto cancel;
1310 	}
1311 
1312 	/* TODO: conditional neighbour physaddr? */
1313 
1314 	nlmsg_end(skb, nlh);
1315 
1316 	return 0;
1317 
1318 cancel:
1319 	nlmsg_cancel(skb, nlh);
1320 	return -EMSGSIZE;
1321 }
1322 
1323 static int mctp_dump_rtinfo(struct sk_buff *skb, struct netlink_callback *cb)
1324 {
1325 	struct net *net = sock_net(skb->sk);
1326 	struct mctp_route *rt;
1327 	int s_idx, idx;
1328 
1329 	/* TODO: allow filtering on route data, possibly under
1330 	 * cb->strict_check
1331 	 */
1332 
1333 	/* TODO: change to struct overlay */
1334 	s_idx = cb->args[0];
1335 	idx = 0;
1336 
1337 	rcu_read_lock();
1338 	list_for_each_entry_rcu(rt, &net->mctp.routes, list) {
1339 		if (idx++ < s_idx)
1340 			continue;
1341 		if (mctp_fill_rtinfo(skb, rt,
1342 				     NETLINK_CB(cb->skb).portid,
1343 				     cb->nlh->nlmsg_seq,
1344 				     RTM_NEWROUTE, NLM_F_MULTI) < 0)
1345 			break;
1346 	}
1347 
1348 	rcu_read_unlock();
1349 	cb->args[0] = idx;
1350 
1351 	return skb->len;
1352 }
1353 
1354 /* net namespace implementation */
1355 static int __net_init mctp_routes_net_init(struct net *net)
1356 {
1357 	struct netns_mctp *ns = &net->mctp;
1358 
1359 	INIT_LIST_HEAD(&ns->routes);
1360 	INIT_HLIST_HEAD(&ns->binds);
1361 	mutex_init(&ns->bind_lock);
1362 	INIT_HLIST_HEAD(&ns->keys);
1363 	spin_lock_init(&ns->keys_lock);
1364 	WARN_ON(mctp_default_net_set(net, MCTP_INITIAL_DEFAULT_NET));
1365 	return 0;
1366 }
1367 
1368 static void __net_exit mctp_routes_net_exit(struct net *net)
1369 {
1370 	struct mctp_route *rt;
1371 
1372 	rcu_read_lock();
1373 	list_for_each_entry_rcu(rt, &net->mctp.routes, list)
1374 		mctp_route_release(rt);
1375 	rcu_read_unlock();
1376 }
1377 
1378 static struct pernet_operations mctp_net_ops = {
1379 	.init = mctp_routes_net_init,
1380 	.exit = mctp_routes_net_exit,
1381 };
1382 
1383 int __init mctp_routes_init(void)
1384 {
1385 	dev_add_pack(&mctp_packet_type);
1386 
1387 	rtnl_register_module(THIS_MODULE, PF_MCTP, RTM_GETROUTE,
1388 			     NULL, mctp_dump_rtinfo, 0);
1389 	rtnl_register_module(THIS_MODULE, PF_MCTP, RTM_NEWROUTE,
1390 			     mctp_newroute, NULL, 0);
1391 	rtnl_register_module(THIS_MODULE, PF_MCTP, RTM_DELROUTE,
1392 			     mctp_delroute, NULL, 0);
1393 
1394 	return register_pernet_subsys(&mctp_net_ops);
1395 }
1396 
1397 void __exit mctp_routes_exit(void)
1398 {
1399 	unregister_pernet_subsys(&mctp_net_ops);
1400 	rtnl_unregister(PF_MCTP, RTM_DELROUTE);
1401 	rtnl_unregister(PF_MCTP, RTM_NEWROUTE);
1402 	rtnl_unregister(PF_MCTP, RTM_GETROUTE);
1403 	dev_remove_pack(&mctp_packet_type);
1404 }
1405 
1406 #if IS_ENABLED(CONFIG_MCTP_TEST)
1407 #include "test/route-test.c"
1408 #endif
1409