1/*
  2 * Copyright (c) 2005 Voltaire Inc.  All rights reserved.
  3 * Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved.
  4 * Copyright (c) 1999-2005, Mellanox Technologies, Inc. All rights reserved.
  5 * Copyright (c) 2005 Intel Corporation.  All rights reserved.
  6 *
  7 * This software is available to you under a choice of one of two
  8 * licenses.  You may choose to be licensed under the terms of the GNU
  9 * General Public License (GPL) Version 2, available from the file
 10 * COPYING in the main directory of this source tree, or the
 11 * OpenIB.org BSD license below:
 12 *
 13 *     Redistribution and use in source and binary forms, with or
 14 *     without modification, are permitted provided that the following
 15 *     conditions are met:
 16 *
 17 *      - Redistributions of source code must retain the above
 18 *        copyright notice, this list of conditions and the following
 19 *        disclaimer.
 20 *
 21 *      - Redistributions in binary form must reproduce the above
 22 *        copyright notice, this list of conditions and the following
 23 *        disclaimer in the documentation and/or other materials
 24 *        provided with the distribution.
 25 *
 26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 33 * SOFTWARE.
 34 */
 35
 36#include <linux/mutex.h>
 37#include <linux/inetdevice.h>
 38#include <linux/slab.h>
 39#include <linux/workqueue.h>
 
 40#include <net/arp.h>
 41#include <net/neighbour.h>
 42#include <net/route.h>
 43#include <net/netevent.h>
 44#include <net/ipv6_stubs.h>
 45#include <net/ip6_route.h>
 46#include <rdma/ib_addr.h>
 47#include <rdma/ib_cache.h>
 48#include <rdma/ib_sa.h>
 49#include <rdma/ib.h>
 50#include <rdma/rdma_netlink.h>
 51#include <net/netlink.h>
 52
 53#include "core_priv.h"
 
 
 54
 55struct addr_req {
 56	struct list_head list;
 57	struct sockaddr_storage src_addr;
 58	struct sockaddr_storage dst_addr;
 59	struct rdma_dev_addr *addr;
 
 60	void *context;
 61	void (*callback)(int status, struct sockaddr *src_addr,
 62			 struct rdma_dev_addr *addr, void *context);
 63	unsigned long timeout;
 64	struct delayed_work work;
 65	bool resolve_by_gid_attr;	/* Consider gid attr in resolve phase */
 66	int status;
 67	u32 seq;
 68};
 69
 70static atomic_t ib_nl_addr_request_seq = ATOMIC_INIT(0);
 71
 72static DEFINE_SPINLOCK(lock);
 73static LIST_HEAD(req_list);
 
 74static struct workqueue_struct *addr_wq;
 75
 76static const struct nla_policy ib_nl_addr_policy[LS_NLA_TYPE_MAX] = {
 77	[LS_NLA_TYPE_DGID] = {.type = NLA_BINARY,
 78		.len = sizeof(struct rdma_nla_ls_gid),
 79		.validation_type = NLA_VALIDATE_MIN,
 80		.min = sizeof(struct rdma_nla_ls_gid)},
 81};
 82
 83static inline bool ib_nl_is_good_ip_resp(const struct nlmsghdr *nlh)
 84{
 85	struct nlattr *tb[LS_NLA_TYPE_MAX] = {};
 86	int ret;
 87
 88	if (nlh->nlmsg_flags & RDMA_NL_LS_F_ERR)
 89		return false;
 90
 91	ret = nla_parse_deprecated(tb, LS_NLA_TYPE_MAX - 1, nlmsg_data(nlh),
 92				   nlmsg_len(nlh), ib_nl_addr_policy, NULL);
 93	if (ret)
 94		return false;
 95
 96	return true;
 97}
 98
 99static void ib_nl_process_good_ip_rsep(const struct nlmsghdr *nlh)
100{
101	const struct nlattr *head, *curr;
102	union ib_gid gid;
103	struct addr_req *req;
104	int len, rem;
105	int found = 0;
106
107	head = (const struct nlattr *)nlmsg_data(nlh);
108	len = nlmsg_len(nlh);
109
110	nla_for_each_attr(curr, head, len, rem) {
111		if (curr->nla_type == LS_NLA_TYPE_DGID)
112			memcpy(&gid, nla_data(curr), nla_len(curr));
113	}
114
115	spin_lock_bh(&lock);
116	list_for_each_entry(req, &req_list, list) {
117		if (nlh->nlmsg_seq != req->seq)
118			continue;
119		/* We set the DGID part, the rest was set earlier */
120		rdma_addr_set_dgid(req->addr, &gid);
121		req->status = 0;
122		found = 1;
123		break;
124	}
125	spin_unlock_bh(&lock);
126
127	if (!found)
128		pr_info("Couldn't find request waiting for DGID: %pI6\n",
129			&gid);
130}
131
132int ib_nl_handle_ip_res_resp(struct sk_buff *skb,
133			     struct nlmsghdr *nlh,
134			     struct netlink_ext_ack *extack)
135{
136	if ((nlh->nlmsg_flags & NLM_F_REQUEST) ||
137	    !(NETLINK_CB(skb).sk))
138		return -EPERM;
139
140	if (ib_nl_is_good_ip_resp(nlh))
141		ib_nl_process_good_ip_rsep(nlh);
142
143	return 0;
144}
145
146static int ib_nl_ip_send_msg(struct rdma_dev_addr *dev_addr,
147			     const void *daddr,
148			     u32 seq, u16 family)
149{
150	struct sk_buff *skb = NULL;
151	struct nlmsghdr *nlh;
152	struct rdma_ls_ip_resolve_header *header;
153	void *data;
154	size_t size;
155	int attrtype;
156	int len;
157
158	if (family == AF_INET) {
159		size = sizeof(struct in_addr);
160		attrtype = RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_IPV4;
161	} else {
162		size = sizeof(struct in6_addr);
163		attrtype = RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_IPV6;
164	}
165
166	len = nla_total_size(sizeof(size));
167	len += NLMSG_ALIGN(sizeof(*header));
168
169	skb = nlmsg_new(len, GFP_KERNEL);
170	if (!skb)
171		return -ENOMEM;
172
173	data = ibnl_put_msg(skb, &nlh, seq, 0, RDMA_NL_LS,
174			    RDMA_NL_LS_OP_IP_RESOLVE, NLM_F_REQUEST);
175	if (!data) {
176		nlmsg_free(skb);
177		return -ENODATA;
178	}
179
180	/* Construct the family header first */
181	header = skb_put(skb, NLMSG_ALIGN(sizeof(*header)));
182	header->ifindex = dev_addr->bound_dev_if;
183	nla_put(skb, attrtype, size, daddr);
184
185	/* Repair the nlmsg header length */
186	nlmsg_end(skb, nlh);
187	rdma_nl_multicast(&init_net, skb, RDMA_NL_GROUP_LS, GFP_KERNEL);
188
189	/* Make the request retry, so when we get the response from userspace
190	 * we will have something.
191	 */
192	return -ENODATA;
193}
194
195int rdma_addr_size(const struct sockaddr *addr)
196{
197	switch (addr->sa_family) {
198	case AF_INET:
199		return sizeof(struct sockaddr_in);
200	case AF_INET6:
201		return sizeof(struct sockaddr_in6);
202	case AF_IB:
203		return sizeof(struct sockaddr_ib);
204	default:
205		return 0;
206	}
207}
208EXPORT_SYMBOL(rdma_addr_size);
209
210int rdma_addr_size_in6(struct sockaddr_in6 *addr)
211{
212	int ret = rdma_addr_size((struct sockaddr *) addr);
213
214	return ret <= sizeof(*addr) ? ret : 0;
 
 
 
215}
216EXPORT_SYMBOL(rdma_addr_size_in6);
217
218int rdma_addr_size_kss(struct __kernel_sockaddr_storage *addr)
219{
220	int ret = rdma_addr_size((struct sockaddr *) addr);
 
 
221
222	return ret <= sizeof(*addr) ? ret : 0;
 
 
 
223}
224EXPORT_SYMBOL(rdma_addr_size_kss);
225
226/**
227 * rdma_copy_src_l2_addr - Copy netdevice source addresses
228 * @dev_addr:	Destination address pointer where to copy the addresses
229 * @dev:	Netdevice whose source addresses to copy
230 *
231 * rdma_copy_src_l2_addr() copies source addresses from the specified netdevice.
232 * This includes unicast address, broadcast address, device type and
233 * interface index.
234 */
235void rdma_copy_src_l2_addr(struct rdma_dev_addr *dev_addr,
236			   const struct net_device *dev)
237{
238	dev_addr->dev_type = dev->type;
239	memcpy(dev_addr->src_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
240	memcpy(dev_addr->broadcast, dev->broadcast, MAX_ADDR_LEN);
 
 
241	dev_addr->bound_dev_if = dev->ifindex;
 
242}
243EXPORT_SYMBOL(rdma_copy_src_l2_addr);
244
245static struct net_device *
246rdma_find_ndev_for_src_ip_rcu(struct net *net, const struct sockaddr *src_in)
 
247{
248	struct net_device *dev = NULL;
249	int ret = -EADDRNOTAVAIL;
250
251	switch (src_in->sa_family) {
 
 
 
 
 
 
 
 
 
252	case AF_INET:
253		dev = __ip_dev_find(net,
254				    ((const struct sockaddr_in *)src_in)->sin_addr.s_addr,
255				    false);
256		if (dev)
257			ret = 0;
 
 
 
 
 
258		break;
259#if IS_ENABLED(CONFIG_IPV6)
260	case AF_INET6:
261		for_each_netdev_rcu(net, dev) {
262			if (ipv6_chk_addr(net,
263					  &((const struct sockaddr_in6 *)src_in)->sin6_addr,
 
264					  dev, 1)) {
265				ret = 0;
 
 
266				break;
267			}
268		}
 
269		break;
270#endif
271	}
272	return ret ? ERR_PTR(ret) : dev;
273}
274
275int rdma_translate_ip(const struct sockaddr *addr,
276		      struct rdma_dev_addr *dev_addr)
277{
278	struct net_device *dev;
279
280	if (dev_addr->bound_dev_if) {
281		dev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
282		if (!dev)
283			return -ENODEV;
284		rdma_copy_src_l2_addr(dev_addr, dev);
285		dev_put(dev);
286		return 0;
287	}
288
289	rcu_read_lock();
290	dev = rdma_find_ndev_for_src_ip_rcu(dev_addr->net, addr);
291	if (!IS_ERR(dev))
292		rdma_copy_src_l2_addr(dev_addr, dev);
293	rcu_read_unlock();
294	return PTR_ERR_OR_ZERO(dev);
295}
296EXPORT_SYMBOL(rdma_translate_ip);
297
298static void set_timeout(struct addr_req *req, unsigned long time)
299{
300	unsigned long delay;
301
302	delay = time - jiffies;
303	if ((long)delay < 0)
304		delay = 0;
305
306	mod_delayed_work(addr_wq, &req->work, delay);
307}
308
309static void queue_req(struct addr_req *req)
310{
311	spin_lock_bh(&lock);
312	list_add_tail(&req->list, &req_list);
313	set_timeout(req, req->timeout);
314	spin_unlock_bh(&lock);
315}
316
317static int ib_nl_fetch_ha(struct rdma_dev_addr *dev_addr,
318			  const void *daddr, u32 seq, u16 family)
319{
320	if (!rdma_nl_chk_listeners(RDMA_NL_GROUP_LS))
321		return -EADDRNOTAVAIL;
 
 
322
323	return ib_nl_ip_send_msg(dev_addr, daddr, seq, family);
 
 
324}
325
326static int dst_fetch_ha(const struct dst_entry *dst,
327			struct rdma_dev_addr *dev_addr,
328			const void *daddr)
329{
330	struct neighbour *n;
331	int ret = 0;
332
333	n = dst_neigh_lookup(dst, daddr);
334	if (!n)
335		return -ENODATA;
336
337	if (!(n->nud_state & NUD_VALID)) {
338		neigh_event_send(n, NULL);
 
 
339		ret = -ENODATA;
340	} else {
341		neigh_ha_snapshot(dev_addr->dst_dev_addr, n, dst->dev);
342	}
 
343
344	neigh_release(n);
 
345
346	return ret;
347}
348
349static bool has_gateway(const struct dst_entry *dst, sa_family_t family)
350{
351	if (family == AF_INET)
352		return dst_rtable(dst)->rt_uses_gateway;
353
354	return dst_rt6_info(dst)->rt6i_flags & RTF_GATEWAY;
355}
356
357static int fetch_ha(const struct dst_entry *dst, struct rdma_dev_addr *dev_addr,
358		    const struct sockaddr *dst_in, u32 seq)
359{
360	const struct sockaddr_in *dst_in4 =
361		(const struct sockaddr_in *)dst_in;
362	const struct sockaddr_in6 *dst_in6 =
363		(const struct sockaddr_in6 *)dst_in;
364	const void *daddr = (dst_in->sa_family == AF_INET) ?
365		(const void *)&dst_in4->sin_addr.s_addr :
366		(const void *)&dst_in6->sin6_addr;
367	sa_family_t family = dst_in->sa_family;
368
369	might_sleep();
370
371	/* If we have a gateway in IB mode then it must be an IB network */
372	if (has_gateway(dst, family) && dev_addr->network == RDMA_NETWORK_IB)
373		return ib_nl_fetch_ha(dev_addr, daddr, seq, family);
374	else
375		return dst_fetch_ha(dst, dev_addr, daddr);
376}
377
378static int addr4_resolve(struct sockaddr *src_sock,
379			 const struct sockaddr *dst_sock,
380			 struct rdma_dev_addr *addr,
381			 struct rtable **prt)
382{
383	struct sockaddr_in *src_in = (struct sockaddr_in *)src_sock;
384	const struct sockaddr_in *dst_in =
385			(const struct sockaddr_in *)dst_sock;
386
387	__be32 src_ip = src_in->sin_addr.s_addr;
388	__be32 dst_ip = dst_in->sin_addr.s_addr;
389	struct rtable *rt;
390	struct flowi4 fl4;
391	int ret;
392
393	memset(&fl4, 0, sizeof(fl4));
394	fl4.daddr = dst_ip;
395	fl4.saddr = src_ip;
396	fl4.flowi4_oif = addr->bound_dev_if;
397	rt = ip_route_output_key(addr->net, &fl4);
398	ret = PTR_ERR_OR_ZERO(rt);
399	if (ret)
400		return ret;
401
 
402	src_in->sin_addr.s_addr = fl4.saddr;
403
 
 
 
 
 
 
404	addr->hoplimit = ip4_dst_hoplimit(&rt->dst);
405
406	*prt = rt;
407	return 0;
 
 
408}
409
410#if IS_ENABLED(CONFIG_IPV6)
411static int addr6_resolve(struct sockaddr *src_sock,
412			 const struct sockaddr *dst_sock,
413			 struct rdma_dev_addr *addr,
414			 struct dst_entry **pdst)
415{
416	struct sockaddr_in6 *src_in = (struct sockaddr_in6 *)src_sock;
417	const struct sockaddr_in6 *dst_in =
418				(const struct sockaddr_in6 *)dst_sock;
419	struct flowi6 fl6;
420	struct dst_entry *dst;
 
 
421
422	memset(&fl6, 0, sizeof fl6);
423	fl6.daddr = dst_in->sin6_addr;
424	fl6.saddr = src_in->sin6_addr;
425	fl6.flowi6_oif = addr->bound_dev_if;
426
427	dst = ipv6_stub->ipv6_dst_lookup_flow(addr->net, NULL, &fl6, NULL);
428	if (IS_ERR(dst))
429		return PTR_ERR(dst);
 
 
 
 
 
 
 
430
431	if (ipv6_addr_any(&src_in->sin6_addr))
432		src_in->sin6_addr = fl6.saddr;
 
 
 
 
 
 
 
433
434	addr->hoplimit = ip6_dst_hoplimit(dst);
435
436	*pdst = dst;
437	return 0;
 
 
 
438}
439#else
440static int addr6_resolve(struct sockaddr *src_sock,
441			 const struct sockaddr *dst_sock,
442			 struct rdma_dev_addr *addr,
443			 struct dst_entry **pdst)
444{
445	return -EADDRNOTAVAIL;
446}
447#endif
448
449static int addr_resolve_neigh(const struct dst_entry *dst,
450			      const struct sockaddr *dst_in,
451			      struct rdma_dev_addr *addr,
452			      unsigned int ndev_flags,
453			      u32 seq)
454{
455	int ret = 0;
 
456
457	if (ndev_flags & IFF_LOOPBACK) {
458		memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN);
459	} else {
460		if (!(ndev_flags & IFF_NOARP)) {
461			/* If the device doesn't do ARP internally */
462			ret = fetch_ha(dst, addr, dst_in, seq);
463		}
464	}
465	return ret;
466}
467
468static int copy_src_l2_addr(struct rdma_dev_addr *dev_addr,
469			    const struct sockaddr *dst_in,
470			    const struct dst_entry *dst,
471			    const struct net_device *ndev)
472{
473	int ret = 0;
474
475	if (dst->dev->flags & IFF_LOOPBACK)
476		ret = rdma_translate_ip(dst_in, dev_addr);
477	else
478		rdma_copy_src_l2_addr(dev_addr, dst->dev);
479
480	/*
481	 * If there's a gateway and type of device not ARPHRD_INFINIBAND,
482	 * we're definitely in RoCE v2 (as RoCE v1 isn't routable) set the
483	 * network type accordingly.
484	 */
485	if (has_gateway(dst, dst_in->sa_family) &&
486	    ndev->type != ARPHRD_INFINIBAND)
487		dev_addr->network = dst_in->sa_family == AF_INET ?
488						RDMA_NETWORK_IPV4 :
489						RDMA_NETWORK_IPV6;
490	else
491		dev_addr->network = RDMA_NETWORK_IB;
492
493	return ret;
494}
495
496static int rdma_set_src_addr_rcu(struct rdma_dev_addr *dev_addr,
497				 unsigned int *ndev_flags,
498				 const struct sockaddr *dst_in,
499				 const struct dst_entry *dst)
500{
501	struct net_device *ndev = READ_ONCE(dst->dev);
502
503	*ndev_flags = ndev->flags;
504	/* A physical device must be the RDMA device to use */
505	if (ndev->flags & IFF_LOOPBACK) {
506		/*
507		 * RDMA (IB/RoCE, iWarp) doesn't run on lo interface or
508		 * loopback IP address. So if route is resolved to loopback
509		 * interface, translate that to a real ndev based on non
510		 * loopback IP address.
511		 */
512		ndev = rdma_find_ndev_for_src_ip_rcu(dev_net(ndev), dst_in);
513		if (IS_ERR(ndev))
514			return -ENODEV;
515	}
516
517	return copy_src_l2_addr(dev_addr, dst_in, dst, ndev);
518}
519
520static int set_addr_netns_by_gid_rcu(struct rdma_dev_addr *addr)
 
 
 
521{
522	struct net_device *ndev;
 
 
523
524	ndev = rdma_read_gid_attr_ndev_rcu(addr->sgid_attr);
525	if (IS_ERR(ndev))
526		return PTR_ERR(ndev);
527
528	/*
529	 * Since we are holding the rcu, reading net and ifindex
530	 * are safe without any additional reference; because
531	 * change_net_namespace() in net/core/dev.c does rcu sync
532	 * after it changes the state to IFF_DOWN and before
533	 * updating netdev fields {net, ifindex}.
534	 */
535	addr->net = dev_net(ndev);
536	addr->bound_dev_if = ndev->ifindex;
537	return 0;
538}
539
540static void rdma_addr_set_net_defaults(struct rdma_dev_addr *addr)
541{
542	addr->net = &init_net;
543	addr->bound_dev_if = 0;
544}
545
546static int addr_resolve(struct sockaddr *src_in,
547			const struct sockaddr *dst_in,
548			struct rdma_dev_addr *addr,
549			bool resolve_neigh,
550			bool resolve_by_gid_attr,
551			u32 seq)
552{
553	struct dst_entry *dst = NULL;
554	unsigned int ndev_flags = 0;
555	struct rtable *rt = NULL;
556	int ret;
557
558	if (!addr->net) {
559		pr_warn_ratelimited("%s: missing namespace\n", __func__);
560		return -EINVAL;
561	}
562
563	rcu_read_lock();
564	if (resolve_by_gid_attr) {
565		if (!addr->sgid_attr) {
566			rcu_read_unlock();
567			pr_warn_ratelimited("%s: missing gid_attr\n", __func__);
568			return -EINVAL;
569		}
570		/*
571		 * If the request is for a specific gid attribute of the
572		 * rdma_dev_addr, derive net from the netdevice of the
573		 * GID attribute.
574		 */
575		ret = set_addr_netns_by_gid_rcu(addr);
576		if (ret) {
577			rcu_read_unlock();
578			return ret;
579		}
580	}
581	if (src_in->sa_family == AF_INET) {
582		ret = addr4_resolve(src_in, dst_in, addr, &rt);
583		dst = &rt->dst;
584	} else {
585		ret = addr6_resolve(src_in, dst_in, addr, &dst);
586	}
587	if (ret) {
588		rcu_read_unlock();
589		goto done;
590	}
591	ret = rdma_set_src_addr_rcu(addr, &ndev_flags, dst_in, dst);
592	rcu_read_unlock();
593
594	/*
595	 * Resolve neighbor destination address if requested and
596	 * only if src addr translation didn't fail.
597	 */
598	if (!ret && resolve_neigh)
599		ret = addr_resolve_neigh(dst, dst_in, addr, ndev_flags, seq);
600
601	if (src_in->sa_family == AF_INET)
602		ip_rt_put(rt);
603	else
604		dst_release(dst);
605done:
606	/*
607	 * Clear the addr net to go back to its original state, only if it was
608	 * derived from GID attribute in this context.
609	 */
610	if (resolve_by_gid_attr)
611		rdma_addr_set_net_defaults(addr);
612	return ret;
613}
614
615static void process_one_req(struct work_struct *_work)
616{
617	struct addr_req *req;
618	struct sockaddr *src_in, *dst_in;
 
619
620	req = container_of(_work, struct addr_req, work.work);
621
622	if (req->status == -ENODATA) {
623		src_in = (struct sockaddr *)&req->src_addr;
624		dst_in = (struct sockaddr *)&req->dst_addr;
625		req->status = addr_resolve(src_in, dst_in, req->addr,
626					   true, req->resolve_by_gid_attr,
627					   req->seq);
628		if (req->status && time_after_eq(jiffies, req->timeout)) {
629			req->status = -ETIMEDOUT;
630		} else if (req->status == -ENODATA) {
631			/* requeue the work for retrying again */
632			spin_lock_bh(&lock);
633			if (!list_empty(&req->list))
634				set_timeout(req, req->timeout);
635			spin_unlock_bh(&lock);
636			return;
637		}
 
638	}
639
640	req->callback(req->status, (struct sockaddr *)&req->src_addr,
641		req->addr, req->context);
642	req->callback = NULL;
643
644	spin_lock_bh(&lock);
645	/*
646	 * Although the work will normally have been canceled by the workqueue,
647	 * it can still be requeued as long as it is on the req_list.
648	 */
649	cancel_delayed_work(&req->work);
650	if (!list_empty(&req->list)) {
651		list_del_init(&req->list);
652		kfree(req);
653	}
654	spin_unlock_bh(&lock);
655}
656
657int rdma_resolve_ip(struct sockaddr *src_addr, const struct sockaddr *dst_addr,
658		    struct rdma_dev_addr *addr, unsigned long timeout_ms,
 
659		    void (*callback)(int status, struct sockaddr *src_addr,
660				     struct rdma_dev_addr *addr, void *context),
661		    bool resolve_by_gid_attr, void *context)
662{
663	struct sockaddr *src_in, *dst_in;
664	struct addr_req *req;
665	int ret = 0;
666
667	req = kzalloc(sizeof *req, GFP_KERNEL);
668	if (!req)
669		return -ENOMEM;
670
671	src_in = (struct sockaddr *) &req->src_addr;
672	dst_in = (struct sockaddr *) &req->dst_addr;
673
674	if (src_addr) {
675		if (src_addr->sa_family != dst_addr->sa_family) {
676			ret = -EINVAL;
677			goto err;
678		}
679
680		memcpy(src_in, src_addr, rdma_addr_size(src_addr));
681	} else {
682		src_in->sa_family = dst_addr->sa_family;
683	}
684
685	memcpy(dst_in, dst_addr, rdma_addr_size(dst_addr));
686	req->addr = addr;
687	req->callback = callback;
688	req->context = context;
689	req->resolve_by_gid_attr = resolve_by_gid_attr;
690	INIT_DELAYED_WORK(&req->work, process_one_req);
691	req->seq = (u32)atomic_inc_return(&ib_nl_addr_request_seq);
692
693	req->status = addr_resolve(src_in, dst_in, addr, true,
694				   req->resolve_by_gid_attr, req->seq);
695	switch (req->status) {
696	case 0:
697		req->timeout = jiffies;
698		queue_req(req);
699		break;
700	case -ENODATA:
701		req->timeout = msecs_to_jiffies(timeout_ms) + jiffies;
702		queue_req(req);
703		break;
704	default:
705		ret = req->status;
 
706		goto err;
707	}
708	return ret;
709err:
710	kfree(req);
711	return ret;
712}
713EXPORT_SYMBOL(rdma_resolve_ip);
714
715int roce_resolve_route_from_path(struct sa_path_rec *rec,
716				 const struct ib_gid_attr *attr)
 
717{
718	union {
719		struct sockaddr     _sockaddr;
720		struct sockaddr_in  _sockaddr_in;
721		struct sockaddr_in6 _sockaddr_in6;
722	} sgid, dgid;
723	struct rdma_dev_addr dev_addr = {};
724	int ret;
725
726	might_sleep();
727
728	if (rec->roce.route_resolved)
729		return 0;
730
731	rdma_gid2ip((struct sockaddr *)&sgid, &rec->sgid);
732	rdma_gid2ip((struct sockaddr *)&dgid, &rec->dgid);
733
734	if (sgid._sockaddr.sa_family != dgid._sockaddr.sa_family)
735		return -EINVAL;
736
737	if (!attr || !attr->ndev)
738		return -EINVAL;
739
740	dev_addr.net = &init_net;
741	dev_addr.sgid_attr = attr;
742
743	ret = addr_resolve((struct sockaddr *)&sgid, (struct sockaddr *)&dgid,
744			   &dev_addr, false, true, 0);
745	if (ret)
746		return ret;
747
748	if ((dev_addr.network == RDMA_NETWORK_IPV4 ||
749	     dev_addr.network == RDMA_NETWORK_IPV6) &&
750	    rec->rec_type != SA_PATH_REC_TYPE_ROCE_V2)
751		return -EINVAL;
752
753	rec->roce.route_resolved = true;
754	return 0;
755}
 
756
757/**
758 * rdma_addr_cancel - Cancel resolve ip request
759 * @addr:	Pointer to address structure given previously
760 *		during rdma_resolve_ip().
761 * rdma_addr_cancel() is synchronous function which cancels any pending
762 * request if there is any.
763 */
764void rdma_addr_cancel(struct rdma_dev_addr *addr)
765{
766	struct addr_req *req, *temp_req;
767	struct addr_req *found = NULL;
768
769	spin_lock_bh(&lock);
770	list_for_each_entry_safe(req, temp_req, &req_list, list) {
771		if (req->addr == addr) {
772			/*
773			 * Removing from the list means we take ownership of
774			 * the req
775			 */
776			list_del_init(&req->list);
777			found = req;
778			break;
779		}
780	}
781	spin_unlock_bh(&lock);
782
783	if (!found)
784		return;
785
786	/*
787	 * sync canceling the work after removing it from the req_list
788	 * guarentees no work is running and none will be started.
789	 */
790	cancel_delayed_work_sync(&found->work);
791	kfree(found);
792}
793EXPORT_SYMBOL(rdma_addr_cancel);
794
795struct resolve_cb_context {
 
796	struct completion comp;
797	int status;
798};
799
800static void resolve_cb(int status, struct sockaddr *src_addr,
801	     struct rdma_dev_addr *addr, void *context)
802{
803	((struct resolve_cb_context *)context)->status = status;
 
804	complete(&((struct resolve_cb_context *)context)->comp);
805}
806
807int rdma_addr_find_l2_eth_by_grh(const union ib_gid *sgid,
808				 const union ib_gid *dgid,
809				 u8 *dmac, const struct ib_gid_attr *sgid_attr,
810				 int *hoplimit)
811{
 
812	struct rdma_dev_addr dev_addr;
813	struct resolve_cb_context ctx;
 
 
814	union {
 
815		struct sockaddr_in  _sockaddr_in;
816		struct sockaddr_in6 _sockaddr_in6;
817	} sgid_addr, dgid_addr;
818	int ret;
819
820	rdma_gid2ip((struct sockaddr *)&sgid_addr, sgid);
821	rdma_gid2ip((struct sockaddr *)&dgid_addr, dgid);
 
822
823	memset(&dev_addr, 0, sizeof(dev_addr));
 
 
824	dev_addr.net = &init_net;
825	dev_addr.sgid_attr = sgid_attr;
826
 
827	init_completion(&ctx.comp);
828	ret = rdma_resolve_ip((struct sockaddr *)&sgid_addr,
829			      (struct sockaddr *)&dgid_addr, &dev_addr, 1000,
830			      resolve_cb, true, &ctx);
831	if (ret)
832		return ret;
833
834	wait_for_completion(&ctx.comp);
835
836	ret = ctx.status;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
837	if (ret)
838		return ret;
839
840	memcpy(dmac, dev_addr.dst_dev_addr, ETH_ALEN);
841	*hoplimit = dev_addr.hoplimit;
842	return 0;
843}
 
844
845static int netevent_callback(struct notifier_block *self, unsigned long event,
846	void *ctx)
847{
848	struct addr_req *req;
849
850	if (event == NETEVENT_NEIGH_UPDATE) {
851		struct neighbour *neigh = ctx;
852
853		if (neigh->nud_state & NUD_VALID) {
854			spin_lock_bh(&lock);
855			list_for_each_entry(req, &req_list, list)
856				set_timeout(req, jiffies);
857			spin_unlock_bh(&lock);
858		}
859	}
860	return 0;
861}
862
863static struct notifier_block nb = {
864	.notifier_call = netevent_callback
865};
866
867int addr_init(void)
868{
869	addr_wq = alloc_ordered_workqueue("ib_addr", 0);
870	if (!addr_wq)
871		return -ENOMEM;
872
873	register_netevent_notifier(&nb);
874
875	return 0;
876}
877
878void addr_cleanup(void)
879{
 
880	unregister_netevent_notifier(&nb);
881	destroy_workqueue(addr_wq);
882	WARN_ON(!list_empty(&req_list));
883}