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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/addrconf.h>
45#include <net/ip6_route.h>
46#include <rdma/ib_addr.h>
47
48MODULE_AUTHOR("Sean Hefty");
49MODULE_DESCRIPTION("IB Address Translation");
50MODULE_LICENSE("Dual BSD/GPL");
51
52struct addr_req {
53 struct list_head list;
54 struct sockaddr_storage src_addr;
55 struct sockaddr_storage dst_addr;
56 struct rdma_dev_addr *addr;
57 struct rdma_addr_client *client;
58 void *context;
59 void (*callback)(int status, struct sockaddr *src_addr,
60 struct rdma_dev_addr *addr, void *context);
61 unsigned long timeout;
62 int status;
63};
64
65static void process_req(struct work_struct *work);
66
67static DEFINE_MUTEX(lock);
68static LIST_HEAD(req_list);
69static DECLARE_DELAYED_WORK(work, process_req);
70static struct workqueue_struct *addr_wq;
71
72void rdma_addr_register_client(struct rdma_addr_client *client)
73{
74 atomic_set(&client->refcount, 1);
75 init_completion(&client->comp);
76}
77EXPORT_SYMBOL(rdma_addr_register_client);
78
79static inline void put_client(struct rdma_addr_client *client)
80{
81 if (atomic_dec_and_test(&client->refcount))
82 complete(&client->comp);
83}
84
85void rdma_addr_unregister_client(struct rdma_addr_client *client)
86{
87 put_client(client);
88 wait_for_completion(&client->comp);
89}
90EXPORT_SYMBOL(rdma_addr_unregister_client);
91
92int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct net_device *dev,
93 const unsigned char *dst_dev_addr)
94{
95 dev_addr->dev_type = dev->type;
96 memcpy(dev_addr->src_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
97 memcpy(dev_addr->broadcast, dev->broadcast, MAX_ADDR_LEN);
98 if (dst_dev_addr)
99 memcpy(dev_addr->dst_dev_addr, dst_dev_addr, MAX_ADDR_LEN);
100 dev_addr->bound_dev_if = dev->ifindex;
101 return 0;
102}
103EXPORT_SYMBOL(rdma_copy_addr);
104
105int rdma_translate_ip(struct sockaddr *addr, struct rdma_dev_addr *dev_addr)
106{
107 struct net_device *dev;
108 int ret = -EADDRNOTAVAIL;
109
110 if (dev_addr->bound_dev_if) {
111 dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
112 if (!dev)
113 return -ENODEV;
114 ret = rdma_copy_addr(dev_addr, dev, NULL);
115 dev_put(dev);
116 return ret;
117 }
118
119 switch (addr->sa_family) {
120 case AF_INET:
121 dev = ip_dev_find(&init_net,
122 ((struct sockaddr_in *) addr)->sin_addr.s_addr);
123
124 if (!dev)
125 return ret;
126
127 ret = rdma_copy_addr(dev_addr, dev, NULL);
128 dev_put(dev);
129 break;
130
131#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
132 case AF_INET6:
133 rcu_read_lock();
134 for_each_netdev_rcu(&init_net, dev) {
135 if (ipv6_chk_addr(&init_net,
136 &((struct sockaddr_in6 *) addr)->sin6_addr,
137 dev, 1)) {
138 ret = rdma_copy_addr(dev_addr, dev, NULL);
139 break;
140 }
141 }
142 rcu_read_unlock();
143 break;
144#endif
145 }
146 return ret;
147}
148EXPORT_SYMBOL(rdma_translate_ip);
149
150static void set_timeout(unsigned long time)
151{
152 unsigned long delay;
153
154 cancel_delayed_work(&work);
155
156 delay = time - jiffies;
157 if ((long)delay <= 0)
158 delay = 1;
159
160 queue_delayed_work(addr_wq, &work, delay);
161}
162
163static void queue_req(struct addr_req *req)
164{
165 struct addr_req *temp_req;
166
167 mutex_lock(&lock);
168 list_for_each_entry_reverse(temp_req, &req_list, list) {
169 if (time_after_eq(req->timeout, temp_req->timeout))
170 break;
171 }
172
173 list_add(&req->list, &temp_req->list);
174
175 if (req_list.next == &req->list)
176 set_timeout(req->timeout);
177 mutex_unlock(&lock);
178}
179
180static int addr4_resolve(struct sockaddr_in *src_in,
181 struct sockaddr_in *dst_in,
182 struct rdma_dev_addr *addr)
183{
184 __be32 src_ip = src_in->sin_addr.s_addr;
185 __be32 dst_ip = dst_in->sin_addr.s_addr;
186 struct rtable *rt;
187 struct neighbour *neigh;
188 struct flowi4 fl4;
189 int ret;
190
191 memset(&fl4, 0, sizeof(fl4));
192 fl4.daddr = dst_ip;
193 fl4.saddr = src_ip;
194 fl4.flowi4_oif = addr->bound_dev_if;
195 rt = ip_route_output_key(&init_net, &fl4);
196 if (IS_ERR(rt)) {
197 ret = PTR_ERR(rt);
198 goto out;
199 }
200 src_in->sin_family = AF_INET;
201 src_in->sin_addr.s_addr = fl4.saddr;
202
203 if (rt->dst.dev->flags & IFF_LOOPBACK) {
204 ret = rdma_translate_ip((struct sockaddr *) dst_in, addr);
205 if (!ret)
206 memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN);
207 goto put;
208 }
209
210 /* If the device does ARP internally, return 'done' */
211 if (rt->dst.dev->flags & IFF_NOARP) {
212 ret = rdma_copy_addr(addr, rt->dst.dev, NULL);
213 goto put;
214 }
215
216 neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, rt->dst.dev);
217 if (!neigh || !(neigh->nud_state & NUD_VALID)) {
218 neigh_event_send(dst_get_neighbour(&rt->dst), NULL);
219 ret = -ENODATA;
220 if (neigh)
221 goto release;
222 goto put;
223 }
224
225 ret = rdma_copy_addr(addr, neigh->dev, neigh->ha);
226release:
227 neigh_release(neigh);
228put:
229 ip_rt_put(rt);
230out:
231 return ret;
232}
233
234#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
235static int addr6_resolve(struct sockaddr_in6 *src_in,
236 struct sockaddr_in6 *dst_in,
237 struct rdma_dev_addr *addr)
238{
239 struct flowi6 fl6;
240 struct neighbour *neigh;
241 struct dst_entry *dst;
242 int ret;
243
244 memset(&fl6, 0, sizeof fl6);
245 ipv6_addr_copy(&fl6.daddr, &dst_in->sin6_addr);
246 ipv6_addr_copy(&fl6.saddr, &src_in->sin6_addr);
247 fl6.flowi6_oif = addr->bound_dev_if;
248
249 dst = ip6_route_output(&init_net, NULL, &fl6);
250 if ((ret = dst->error))
251 goto put;
252
253 if (ipv6_addr_any(&fl6.saddr)) {
254 ret = ipv6_dev_get_saddr(&init_net, ip6_dst_idev(dst)->dev,
255 &fl6.daddr, 0, &fl6.saddr);
256 if (ret)
257 goto put;
258
259 src_in->sin6_family = AF_INET6;
260 ipv6_addr_copy(&src_in->sin6_addr, &fl6.saddr);
261 }
262
263 if (dst->dev->flags & IFF_LOOPBACK) {
264 ret = rdma_translate_ip((struct sockaddr *) dst_in, addr);
265 if (!ret)
266 memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN);
267 goto put;
268 }
269
270 /* If the device does ARP internally, return 'done' */
271 if (dst->dev->flags & IFF_NOARP) {
272 ret = rdma_copy_addr(addr, dst->dev, NULL);
273 goto put;
274 }
275
276 neigh = dst_get_neighbour(dst);
277 if (!neigh || !(neigh->nud_state & NUD_VALID)) {
278 if (neigh)
279 neigh_event_send(neigh, NULL);
280 ret = -ENODATA;
281 goto put;
282 }
283
284 ret = rdma_copy_addr(addr, dst->dev, neigh->ha);
285put:
286 dst_release(dst);
287 return ret;
288}
289#else
290static int addr6_resolve(struct sockaddr_in6 *src_in,
291 struct sockaddr_in6 *dst_in,
292 struct rdma_dev_addr *addr)
293{
294 return -EADDRNOTAVAIL;
295}
296#endif
297
298static int addr_resolve(struct sockaddr *src_in,
299 struct sockaddr *dst_in,
300 struct rdma_dev_addr *addr)
301{
302 if (src_in->sa_family == AF_INET) {
303 return addr4_resolve((struct sockaddr_in *) src_in,
304 (struct sockaddr_in *) dst_in, addr);
305 } else
306 return addr6_resolve((struct sockaddr_in6 *) src_in,
307 (struct sockaddr_in6 *) dst_in, addr);
308}
309
310static void process_req(struct work_struct *work)
311{
312 struct addr_req *req, *temp_req;
313 struct sockaddr *src_in, *dst_in;
314 struct list_head done_list;
315
316 INIT_LIST_HEAD(&done_list);
317
318 mutex_lock(&lock);
319 list_for_each_entry_safe(req, temp_req, &req_list, list) {
320 if (req->status == -ENODATA) {
321 src_in = (struct sockaddr *) &req->src_addr;
322 dst_in = (struct sockaddr *) &req->dst_addr;
323 req->status = addr_resolve(src_in, dst_in, req->addr);
324 if (req->status && time_after_eq(jiffies, req->timeout))
325 req->status = -ETIMEDOUT;
326 else if (req->status == -ENODATA)
327 continue;
328 }
329 list_move_tail(&req->list, &done_list);
330 }
331
332 if (!list_empty(&req_list)) {
333 req = list_entry(req_list.next, struct addr_req, list);
334 set_timeout(req->timeout);
335 }
336 mutex_unlock(&lock);
337
338 list_for_each_entry_safe(req, temp_req, &done_list, list) {
339 list_del(&req->list);
340 req->callback(req->status, (struct sockaddr *) &req->src_addr,
341 req->addr, req->context);
342 put_client(req->client);
343 kfree(req);
344 }
345}
346
347int rdma_resolve_ip(struct rdma_addr_client *client,
348 struct sockaddr *src_addr, struct sockaddr *dst_addr,
349 struct rdma_dev_addr *addr, int timeout_ms,
350 void (*callback)(int status, struct sockaddr *src_addr,
351 struct rdma_dev_addr *addr, void *context),
352 void *context)
353{
354 struct sockaddr *src_in, *dst_in;
355 struct addr_req *req;
356 int ret = 0;
357
358 req = kzalloc(sizeof *req, GFP_KERNEL);
359 if (!req)
360 return -ENOMEM;
361
362 src_in = (struct sockaddr *) &req->src_addr;
363 dst_in = (struct sockaddr *) &req->dst_addr;
364
365 if (src_addr) {
366 if (src_addr->sa_family != dst_addr->sa_family) {
367 ret = -EINVAL;
368 goto err;
369 }
370
371 memcpy(src_in, src_addr, ip_addr_size(src_addr));
372 } else {
373 src_in->sa_family = dst_addr->sa_family;
374 }
375
376 memcpy(dst_in, dst_addr, ip_addr_size(dst_addr));
377 req->addr = addr;
378 req->callback = callback;
379 req->context = context;
380 req->client = client;
381 atomic_inc(&client->refcount);
382
383 req->status = addr_resolve(src_in, dst_in, addr);
384 switch (req->status) {
385 case 0:
386 req->timeout = jiffies;
387 queue_req(req);
388 break;
389 case -ENODATA:
390 req->timeout = msecs_to_jiffies(timeout_ms) + jiffies;
391 queue_req(req);
392 break;
393 default:
394 ret = req->status;
395 atomic_dec(&client->refcount);
396 goto err;
397 }
398 return ret;
399err:
400 kfree(req);
401 return ret;
402}
403EXPORT_SYMBOL(rdma_resolve_ip);
404
405void rdma_addr_cancel(struct rdma_dev_addr *addr)
406{
407 struct addr_req *req, *temp_req;
408
409 mutex_lock(&lock);
410 list_for_each_entry_safe(req, temp_req, &req_list, list) {
411 if (req->addr == addr) {
412 req->status = -ECANCELED;
413 req->timeout = jiffies;
414 list_move(&req->list, &req_list);
415 set_timeout(req->timeout);
416 break;
417 }
418 }
419 mutex_unlock(&lock);
420}
421EXPORT_SYMBOL(rdma_addr_cancel);
422
423static int netevent_callback(struct notifier_block *self, unsigned long event,
424 void *ctx)
425{
426 if (event == NETEVENT_NEIGH_UPDATE) {
427 struct neighbour *neigh = ctx;
428
429 if (neigh->nud_state & NUD_VALID) {
430 set_timeout(jiffies);
431 }
432 }
433 return 0;
434}
435
436static struct notifier_block nb = {
437 .notifier_call = netevent_callback
438};
439
440static int __init addr_init(void)
441{
442 addr_wq = create_singlethread_workqueue("ib_addr");
443 if (!addr_wq)
444 return -ENOMEM;
445
446 register_netevent_notifier(&nb);
447 return 0;
448}
449
450static void __exit addr_cleanup(void)
451{
452 unregister_netevent_notifier(&nb);
453 destroy_workqueue(addr_wq);
454}
455
456module_init(addr_init);
457module_exit(addr_cleanup);
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 <linux/module.h>
41#include <net/arp.h>
42#include <net/neighbour.h>
43#include <net/route.h>
44#include <net/netevent.h>
45#include <net/ipv6_stubs.h>
46#include <net/ip6_route.h>
47#include <rdma/ib_addr.h>
48#include <rdma/ib_cache.h>
49#include <rdma/ib_sa.h>
50#include <rdma/ib.h>
51#include <rdma/rdma_netlink.h>
52#include <net/netlink.h>
53
54#include "core_priv.h"
55
56struct addr_req {
57 struct list_head list;
58 struct sockaddr_storage src_addr;
59 struct sockaddr_storage dst_addr;
60 struct rdma_dev_addr *addr;
61 void *context;
62 void (*callback)(int status, struct sockaddr *src_addr,
63 struct rdma_dev_addr *addr, void *context);
64 unsigned long timeout;
65 struct delayed_work work;
66 bool resolve_by_gid_attr; /* Consider gid attr in resolve phase */
67 int status;
68 u32 seq;
69};
70
71static atomic_t ib_nl_addr_request_seq = ATOMIC_INIT(0);
72
73static DEFINE_SPINLOCK(lock);
74static LIST_HEAD(req_list);
75static struct workqueue_struct *addr_wq;
76
77static const struct nla_policy ib_nl_addr_policy[LS_NLA_TYPE_MAX] = {
78 [LS_NLA_TYPE_DGID] = {.type = NLA_BINARY,
79 .len = sizeof(struct rdma_nla_ls_gid)},
80};
81
82static inline bool ib_nl_is_good_ip_resp(const struct nlmsghdr *nlh)
83{
84 struct nlattr *tb[LS_NLA_TYPE_MAX] = {};
85 int ret;
86
87 if (nlh->nlmsg_flags & RDMA_NL_LS_F_ERR)
88 return false;
89
90 ret = nla_parse_deprecated(tb, LS_NLA_TYPE_MAX - 1, nlmsg_data(nlh),
91 nlmsg_len(nlh), ib_nl_addr_policy, NULL);
92 if (ret)
93 return false;
94
95 return true;
96}
97
98static void ib_nl_process_good_ip_rsep(const struct nlmsghdr *nlh)
99{
100 const struct nlattr *head, *curr;
101 union ib_gid gid;
102 struct addr_req *req;
103 int len, rem;
104 int found = 0;
105
106 head = (const struct nlattr *)nlmsg_data(nlh);
107 len = nlmsg_len(nlh);
108
109 nla_for_each_attr(curr, head, len, rem) {
110 if (curr->nla_type == LS_NLA_TYPE_DGID)
111 memcpy(&gid, nla_data(curr), nla_len(curr));
112 }
113
114 spin_lock_bh(&lock);
115 list_for_each_entry(req, &req_list, list) {
116 if (nlh->nlmsg_seq != req->seq)
117 continue;
118 /* We set the DGID part, the rest was set earlier */
119 rdma_addr_set_dgid(req->addr, &gid);
120 req->status = 0;
121 found = 1;
122 break;
123 }
124 spin_unlock_bh(&lock);
125
126 if (!found)
127 pr_info("Couldn't find request waiting for DGID: %pI6\n",
128 &gid);
129}
130
131int ib_nl_handle_ip_res_resp(struct sk_buff *skb,
132 struct nlmsghdr *nlh,
133 struct netlink_ext_ack *extack)
134{
135 if ((nlh->nlmsg_flags & NLM_F_REQUEST) ||
136 !(NETLINK_CB(skb).sk))
137 return -EPERM;
138
139 if (ib_nl_is_good_ip_resp(nlh))
140 ib_nl_process_good_ip_rsep(nlh);
141
142 return 0;
143}
144
145static int ib_nl_ip_send_msg(struct rdma_dev_addr *dev_addr,
146 const void *daddr,
147 u32 seq, u16 family)
148{
149 struct sk_buff *skb = NULL;
150 struct nlmsghdr *nlh;
151 struct rdma_ls_ip_resolve_header *header;
152 void *data;
153 size_t size;
154 int attrtype;
155 int len;
156
157 if (family == AF_INET) {
158 size = sizeof(struct in_addr);
159 attrtype = RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_IPV4;
160 } else {
161 size = sizeof(struct in6_addr);
162 attrtype = RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_IPV6;
163 }
164
165 len = nla_total_size(sizeof(size));
166 len += NLMSG_ALIGN(sizeof(*header));
167
168 skb = nlmsg_new(len, GFP_KERNEL);
169 if (!skb)
170 return -ENOMEM;
171
172 data = ibnl_put_msg(skb, &nlh, seq, 0, RDMA_NL_LS,
173 RDMA_NL_LS_OP_IP_RESOLVE, NLM_F_REQUEST);
174 if (!data) {
175 nlmsg_free(skb);
176 return -ENODATA;
177 }
178
179 /* Construct the family header first */
180 header = skb_put(skb, NLMSG_ALIGN(sizeof(*header)));
181 header->ifindex = dev_addr->bound_dev_if;
182 nla_put(skb, attrtype, size, daddr);
183
184 /* Repair the nlmsg header length */
185 nlmsg_end(skb, nlh);
186 rdma_nl_multicast(&init_net, skb, RDMA_NL_GROUP_LS, GFP_KERNEL);
187
188 /* Make the request retry, so when we get the response from userspace
189 * we will have something.
190 */
191 return -ENODATA;
192}
193
194int rdma_addr_size(const struct sockaddr *addr)
195{
196 switch (addr->sa_family) {
197 case AF_INET:
198 return sizeof(struct sockaddr_in);
199 case AF_INET6:
200 return sizeof(struct sockaddr_in6);
201 case AF_IB:
202 return sizeof(struct sockaddr_ib);
203 default:
204 return 0;
205 }
206}
207EXPORT_SYMBOL(rdma_addr_size);
208
209int rdma_addr_size_in6(struct sockaddr_in6 *addr)
210{
211 int ret = rdma_addr_size((struct sockaddr *) addr);
212
213 return ret <= sizeof(*addr) ? ret : 0;
214}
215EXPORT_SYMBOL(rdma_addr_size_in6);
216
217int rdma_addr_size_kss(struct __kernel_sockaddr_storage *addr)
218{
219 int ret = rdma_addr_size((struct sockaddr *) addr);
220
221 return ret <= sizeof(*addr) ? ret : 0;
222}
223EXPORT_SYMBOL(rdma_addr_size_kss);
224
225/**
226 * rdma_copy_src_l2_addr - Copy netdevice source addresses
227 * @dev_addr: Destination address pointer where to copy the addresses
228 * @dev: Netdevice whose source addresses to copy
229 *
230 * rdma_copy_src_l2_addr() copies source addresses from the specified netdevice.
231 * This includes unicast address, broadcast address, device type and
232 * interface index.
233 */
234void rdma_copy_src_l2_addr(struct rdma_dev_addr *dev_addr,
235 const struct net_device *dev)
236{
237 dev_addr->dev_type = dev->type;
238 memcpy(dev_addr->src_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
239 memcpy(dev_addr->broadcast, dev->broadcast, MAX_ADDR_LEN);
240 dev_addr->bound_dev_if = dev->ifindex;
241}
242EXPORT_SYMBOL(rdma_copy_src_l2_addr);
243
244static struct net_device *
245rdma_find_ndev_for_src_ip_rcu(struct net *net, const struct sockaddr *src_in)
246{
247 struct net_device *dev = NULL;
248 int ret = -EADDRNOTAVAIL;
249
250 switch (src_in->sa_family) {
251 case AF_INET:
252 dev = __ip_dev_find(net,
253 ((const struct sockaddr_in *)src_in)->sin_addr.s_addr,
254 false);
255 if (dev)
256 ret = 0;
257 break;
258#if IS_ENABLED(CONFIG_IPV6)
259 case AF_INET6:
260 for_each_netdev_rcu(net, dev) {
261 if (ipv6_chk_addr(net,
262 &((const struct sockaddr_in6 *)src_in)->sin6_addr,
263 dev, 1)) {
264 ret = 0;
265 break;
266 }
267 }
268 break;
269#endif
270 }
271 return ret ? ERR_PTR(ret) : dev;
272}
273
274int rdma_translate_ip(const struct sockaddr *addr,
275 struct rdma_dev_addr *dev_addr)
276{
277 struct net_device *dev;
278
279 if (dev_addr->bound_dev_if) {
280 dev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
281 if (!dev)
282 return -ENODEV;
283 rdma_copy_src_l2_addr(dev_addr, dev);
284 dev_put(dev);
285 return 0;
286 }
287
288 rcu_read_lock();
289 dev = rdma_find_ndev_for_src_ip_rcu(dev_addr->net, addr);
290 if (!IS_ERR(dev))
291 rdma_copy_src_l2_addr(dev_addr, dev);
292 rcu_read_unlock();
293 return PTR_ERR_OR_ZERO(dev);
294}
295EXPORT_SYMBOL(rdma_translate_ip);
296
297static void set_timeout(struct addr_req *req, unsigned long time)
298{
299 unsigned long delay;
300
301 delay = time - jiffies;
302 if ((long)delay < 0)
303 delay = 0;
304
305 mod_delayed_work(addr_wq, &req->work, delay);
306}
307
308static void queue_req(struct addr_req *req)
309{
310 spin_lock_bh(&lock);
311 list_add_tail(&req->list, &req_list);
312 set_timeout(req, req->timeout);
313 spin_unlock_bh(&lock);
314}
315
316static int ib_nl_fetch_ha(struct rdma_dev_addr *dev_addr,
317 const void *daddr, u32 seq, u16 family)
318{
319 if (!rdma_nl_chk_listeners(RDMA_NL_GROUP_LS))
320 return -EADDRNOTAVAIL;
321
322 return ib_nl_ip_send_msg(dev_addr, daddr, seq, family);
323}
324
325static int dst_fetch_ha(const struct dst_entry *dst,
326 struct rdma_dev_addr *dev_addr,
327 const void *daddr)
328{
329 struct neighbour *n;
330 int ret = 0;
331
332 n = dst_neigh_lookup(dst, daddr);
333 if (!n)
334 return -ENODATA;
335
336 if (!(n->nud_state & NUD_VALID)) {
337 neigh_event_send(n, NULL);
338 ret = -ENODATA;
339 } else {
340 neigh_ha_snapshot(dev_addr->dst_dev_addr, n, dst->dev);
341 }
342
343 neigh_release(n);
344
345 return ret;
346}
347
348static bool has_gateway(const struct dst_entry *dst, sa_family_t family)
349{
350 struct rtable *rt;
351 struct rt6_info *rt6;
352
353 if (family == AF_INET) {
354 rt = container_of(dst, struct rtable, dst);
355 return rt->rt_uses_gateway;
356 }
357
358 rt6 = container_of(dst, struct rt6_info, dst);
359 return rt6->rt6i_flags & RTF_GATEWAY;
360}
361
362static int fetch_ha(const struct dst_entry *dst, struct rdma_dev_addr *dev_addr,
363 const struct sockaddr *dst_in, u32 seq)
364{
365 const struct sockaddr_in *dst_in4 =
366 (const struct sockaddr_in *)dst_in;
367 const struct sockaddr_in6 *dst_in6 =
368 (const struct sockaddr_in6 *)dst_in;
369 const void *daddr = (dst_in->sa_family == AF_INET) ?
370 (const void *)&dst_in4->sin_addr.s_addr :
371 (const void *)&dst_in6->sin6_addr;
372 sa_family_t family = dst_in->sa_family;
373
374 might_sleep();
375
376 /* If we have a gateway in IB mode then it must be an IB network */
377 if (has_gateway(dst, family) && dev_addr->network == RDMA_NETWORK_IB)
378 return ib_nl_fetch_ha(dev_addr, daddr, seq, family);
379 else
380 return dst_fetch_ha(dst, dev_addr, daddr);
381}
382
383static int addr4_resolve(struct sockaddr *src_sock,
384 const struct sockaddr *dst_sock,
385 struct rdma_dev_addr *addr,
386 struct rtable **prt)
387{
388 struct sockaddr_in *src_in = (struct sockaddr_in *)src_sock;
389 const struct sockaddr_in *dst_in =
390 (const struct sockaddr_in *)dst_sock;
391
392 __be32 src_ip = src_in->sin_addr.s_addr;
393 __be32 dst_ip = dst_in->sin_addr.s_addr;
394 struct rtable *rt;
395 struct flowi4 fl4;
396 int ret;
397
398 memset(&fl4, 0, sizeof(fl4));
399 fl4.daddr = dst_ip;
400 fl4.saddr = src_ip;
401 fl4.flowi4_oif = addr->bound_dev_if;
402 rt = ip_route_output_key(addr->net, &fl4);
403 ret = PTR_ERR_OR_ZERO(rt);
404 if (ret)
405 return ret;
406
407 src_in->sin_addr.s_addr = fl4.saddr;
408
409 addr->hoplimit = ip4_dst_hoplimit(&rt->dst);
410
411 *prt = rt;
412 return 0;
413}
414
415#if IS_ENABLED(CONFIG_IPV6)
416static int addr6_resolve(struct sockaddr *src_sock,
417 const struct sockaddr *dst_sock,
418 struct rdma_dev_addr *addr,
419 struct dst_entry **pdst)
420{
421 struct sockaddr_in6 *src_in = (struct sockaddr_in6 *)src_sock;
422 const struct sockaddr_in6 *dst_in =
423 (const struct sockaddr_in6 *)dst_sock;
424 struct flowi6 fl6;
425 struct dst_entry *dst;
426
427 memset(&fl6, 0, sizeof fl6);
428 fl6.daddr = dst_in->sin6_addr;
429 fl6.saddr = src_in->sin6_addr;
430 fl6.flowi6_oif = addr->bound_dev_if;
431
432 dst = ipv6_stub->ipv6_dst_lookup_flow(addr->net, NULL, &fl6, NULL);
433 if (IS_ERR(dst))
434 return PTR_ERR(dst);
435
436 if (ipv6_addr_any(&src_in->sin6_addr))
437 src_in->sin6_addr = fl6.saddr;
438
439 addr->hoplimit = ip6_dst_hoplimit(dst);
440
441 *pdst = dst;
442 return 0;
443}
444#else
445static int addr6_resolve(struct sockaddr *src_sock,
446 const struct sockaddr *dst_sock,
447 struct rdma_dev_addr *addr,
448 struct dst_entry **pdst)
449{
450 return -EADDRNOTAVAIL;
451}
452#endif
453
454static int addr_resolve_neigh(const struct dst_entry *dst,
455 const struct sockaddr *dst_in,
456 struct rdma_dev_addr *addr,
457 unsigned int ndev_flags,
458 u32 seq)
459{
460 int ret = 0;
461
462 if (ndev_flags & IFF_LOOPBACK) {
463 memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN);
464 } else {
465 if (!(ndev_flags & IFF_NOARP)) {
466 /* If the device doesn't do ARP internally */
467 ret = fetch_ha(dst, addr, dst_in, seq);
468 }
469 }
470 return ret;
471}
472
473static int copy_src_l2_addr(struct rdma_dev_addr *dev_addr,
474 const struct sockaddr *dst_in,
475 const struct dst_entry *dst,
476 const struct net_device *ndev)
477{
478 int ret = 0;
479
480 if (dst->dev->flags & IFF_LOOPBACK)
481 ret = rdma_translate_ip(dst_in, dev_addr);
482 else
483 rdma_copy_src_l2_addr(dev_addr, dst->dev);
484
485 /*
486 * If there's a gateway and type of device not ARPHRD_INFINIBAND,
487 * we're definitely in RoCE v2 (as RoCE v1 isn't routable) set the
488 * network type accordingly.
489 */
490 if (has_gateway(dst, dst_in->sa_family) &&
491 ndev->type != ARPHRD_INFINIBAND)
492 dev_addr->network = dst_in->sa_family == AF_INET ?
493 RDMA_NETWORK_IPV4 :
494 RDMA_NETWORK_IPV6;
495 else
496 dev_addr->network = RDMA_NETWORK_IB;
497
498 return ret;
499}
500
501static int rdma_set_src_addr_rcu(struct rdma_dev_addr *dev_addr,
502 unsigned int *ndev_flags,
503 const struct sockaddr *dst_in,
504 const struct dst_entry *dst)
505{
506 struct net_device *ndev = READ_ONCE(dst->dev);
507
508 *ndev_flags = ndev->flags;
509 /* A physical device must be the RDMA device to use */
510 if (ndev->flags & IFF_LOOPBACK) {
511 /*
512 * RDMA (IB/RoCE, iWarp) doesn't run on lo interface or
513 * loopback IP address. So if route is resolved to loopback
514 * interface, translate that to a real ndev based on non
515 * loopback IP address.
516 */
517 ndev = rdma_find_ndev_for_src_ip_rcu(dev_net(ndev), dst_in);
518 if (IS_ERR(ndev))
519 return -ENODEV;
520 }
521
522 return copy_src_l2_addr(dev_addr, dst_in, dst, ndev);
523}
524
525static int set_addr_netns_by_gid_rcu(struct rdma_dev_addr *addr)
526{
527 struct net_device *ndev;
528
529 ndev = rdma_read_gid_attr_ndev_rcu(addr->sgid_attr);
530 if (IS_ERR(ndev))
531 return PTR_ERR(ndev);
532
533 /*
534 * Since we are holding the rcu, reading net and ifindex
535 * are safe without any additional reference; because
536 * change_net_namespace() in net/core/dev.c does rcu sync
537 * after it changes the state to IFF_DOWN and before
538 * updating netdev fields {net, ifindex}.
539 */
540 addr->net = dev_net(ndev);
541 addr->bound_dev_if = ndev->ifindex;
542 return 0;
543}
544
545static void rdma_addr_set_net_defaults(struct rdma_dev_addr *addr)
546{
547 addr->net = &init_net;
548 addr->bound_dev_if = 0;
549}
550
551static int addr_resolve(struct sockaddr *src_in,
552 const struct sockaddr *dst_in,
553 struct rdma_dev_addr *addr,
554 bool resolve_neigh,
555 bool resolve_by_gid_attr,
556 u32 seq)
557{
558 struct dst_entry *dst = NULL;
559 unsigned int ndev_flags = 0;
560 struct rtable *rt = NULL;
561 int ret;
562
563 if (!addr->net) {
564 pr_warn_ratelimited("%s: missing namespace\n", __func__);
565 return -EINVAL;
566 }
567
568 rcu_read_lock();
569 if (resolve_by_gid_attr) {
570 if (!addr->sgid_attr) {
571 rcu_read_unlock();
572 pr_warn_ratelimited("%s: missing gid_attr\n", __func__);
573 return -EINVAL;
574 }
575 /*
576 * If the request is for a specific gid attribute of the
577 * rdma_dev_addr, derive net from the netdevice of the
578 * GID attribute.
579 */
580 ret = set_addr_netns_by_gid_rcu(addr);
581 if (ret) {
582 rcu_read_unlock();
583 return ret;
584 }
585 }
586 if (src_in->sa_family == AF_INET) {
587 ret = addr4_resolve(src_in, dst_in, addr, &rt);
588 dst = &rt->dst;
589 } else {
590 ret = addr6_resolve(src_in, dst_in, addr, &dst);
591 }
592 if (ret) {
593 rcu_read_unlock();
594 goto done;
595 }
596 ret = rdma_set_src_addr_rcu(addr, &ndev_flags, dst_in, dst);
597 rcu_read_unlock();
598
599 /*
600 * Resolve neighbor destination address if requested and
601 * only if src addr translation didn't fail.
602 */
603 if (!ret && resolve_neigh)
604 ret = addr_resolve_neigh(dst, dst_in, addr, ndev_flags, seq);
605
606 if (src_in->sa_family == AF_INET)
607 ip_rt_put(rt);
608 else
609 dst_release(dst);
610done:
611 /*
612 * Clear the addr net to go back to its original state, only if it was
613 * derived from GID attribute in this context.
614 */
615 if (resolve_by_gid_attr)
616 rdma_addr_set_net_defaults(addr);
617 return ret;
618}
619
620static void process_one_req(struct work_struct *_work)
621{
622 struct addr_req *req;
623 struct sockaddr *src_in, *dst_in;
624
625 req = container_of(_work, struct addr_req, work.work);
626
627 if (req->status == -ENODATA) {
628 src_in = (struct sockaddr *)&req->src_addr;
629 dst_in = (struct sockaddr *)&req->dst_addr;
630 req->status = addr_resolve(src_in, dst_in, req->addr,
631 true, req->resolve_by_gid_attr,
632 req->seq);
633 if (req->status && time_after_eq(jiffies, req->timeout)) {
634 req->status = -ETIMEDOUT;
635 } else if (req->status == -ENODATA) {
636 /* requeue the work for retrying again */
637 spin_lock_bh(&lock);
638 if (!list_empty(&req->list))
639 set_timeout(req, req->timeout);
640 spin_unlock_bh(&lock);
641 return;
642 }
643 }
644
645 req->callback(req->status, (struct sockaddr *)&req->src_addr,
646 req->addr, req->context);
647 req->callback = NULL;
648
649 spin_lock_bh(&lock);
650 if (!list_empty(&req->list)) {
651 /*
652 * Although the work will normally have been canceled by the
653 * workqueue, it can still be requeued as long as it is on the
654 * req_list.
655 */
656 cancel_delayed_work(&req->work);
657 list_del_init(&req->list);
658 kfree(req);
659 }
660 spin_unlock_bh(&lock);
661}
662
663int rdma_resolve_ip(struct sockaddr *src_addr, const struct sockaddr *dst_addr,
664 struct rdma_dev_addr *addr, unsigned long timeout_ms,
665 void (*callback)(int status, struct sockaddr *src_addr,
666 struct rdma_dev_addr *addr, void *context),
667 bool resolve_by_gid_attr, void *context)
668{
669 struct sockaddr *src_in, *dst_in;
670 struct addr_req *req;
671 int ret = 0;
672
673 req = kzalloc(sizeof *req, GFP_KERNEL);
674 if (!req)
675 return -ENOMEM;
676
677 src_in = (struct sockaddr *) &req->src_addr;
678 dst_in = (struct sockaddr *) &req->dst_addr;
679
680 if (src_addr) {
681 if (src_addr->sa_family != dst_addr->sa_family) {
682 ret = -EINVAL;
683 goto err;
684 }
685
686 memcpy(src_in, src_addr, rdma_addr_size(src_addr));
687 } else {
688 src_in->sa_family = dst_addr->sa_family;
689 }
690
691 memcpy(dst_in, dst_addr, rdma_addr_size(dst_addr));
692 req->addr = addr;
693 req->callback = callback;
694 req->context = context;
695 req->resolve_by_gid_attr = resolve_by_gid_attr;
696 INIT_DELAYED_WORK(&req->work, process_one_req);
697 req->seq = (u32)atomic_inc_return(&ib_nl_addr_request_seq);
698
699 req->status = addr_resolve(src_in, dst_in, addr, true,
700 req->resolve_by_gid_attr, req->seq);
701 switch (req->status) {
702 case 0:
703 req->timeout = jiffies;
704 queue_req(req);
705 break;
706 case -ENODATA:
707 req->timeout = msecs_to_jiffies(timeout_ms) + jiffies;
708 queue_req(req);
709 break;
710 default:
711 ret = req->status;
712 goto err;
713 }
714 return ret;
715err:
716 kfree(req);
717 return ret;
718}
719EXPORT_SYMBOL(rdma_resolve_ip);
720
721int roce_resolve_route_from_path(struct sa_path_rec *rec,
722 const struct ib_gid_attr *attr)
723{
724 union {
725 struct sockaddr _sockaddr;
726 struct sockaddr_in _sockaddr_in;
727 struct sockaddr_in6 _sockaddr_in6;
728 } sgid, dgid;
729 struct rdma_dev_addr dev_addr = {};
730 int ret;
731
732 might_sleep();
733
734 if (rec->roce.route_resolved)
735 return 0;
736
737 rdma_gid2ip((struct sockaddr *)&sgid, &rec->sgid);
738 rdma_gid2ip((struct sockaddr *)&dgid, &rec->dgid);
739
740 if (sgid._sockaddr.sa_family != dgid._sockaddr.sa_family)
741 return -EINVAL;
742
743 if (!attr || !attr->ndev)
744 return -EINVAL;
745
746 dev_addr.net = &init_net;
747 dev_addr.sgid_attr = attr;
748
749 ret = addr_resolve((struct sockaddr *)&sgid, (struct sockaddr *)&dgid,
750 &dev_addr, false, true, 0);
751 if (ret)
752 return ret;
753
754 if ((dev_addr.network == RDMA_NETWORK_IPV4 ||
755 dev_addr.network == RDMA_NETWORK_IPV6) &&
756 rec->rec_type != SA_PATH_REC_TYPE_ROCE_V2)
757 return -EINVAL;
758
759 rec->roce.route_resolved = true;
760 return 0;
761}
762
763/**
764 * rdma_addr_cancel - Cancel resolve ip request
765 * @addr: Pointer to address structure given previously
766 * during rdma_resolve_ip().
767 * rdma_addr_cancel() is synchronous function which cancels any pending
768 * request if there is any.
769 */
770void rdma_addr_cancel(struct rdma_dev_addr *addr)
771{
772 struct addr_req *req, *temp_req;
773 struct addr_req *found = NULL;
774
775 spin_lock_bh(&lock);
776 list_for_each_entry_safe(req, temp_req, &req_list, list) {
777 if (req->addr == addr) {
778 /*
779 * Removing from the list means we take ownership of
780 * the req
781 */
782 list_del_init(&req->list);
783 found = req;
784 break;
785 }
786 }
787 spin_unlock_bh(&lock);
788
789 if (!found)
790 return;
791
792 /*
793 * sync canceling the work after removing it from the req_list
794 * guarentees no work is running and none will be started.
795 */
796 cancel_delayed_work_sync(&found->work);
797 kfree(found);
798}
799EXPORT_SYMBOL(rdma_addr_cancel);
800
801struct resolve_cb_context {
802 struct completion comp;
803 int status;
804};
805
806static void resolve_cb(int status, struct sockaddr *src_addr,
807 struct rdma_dev_addr *addr, void *context)
808{
809 ((struct resolve_cb_context *)context)->status = status;
810 complete(&((struct resolve_cb_context *)context)->comp);
811}
812
813int rdma_addr_find_l2_eth_by_grh(const union ib_gid *sgid,
814 const union ib_gid *dgid,
815 u8 *dmac, const struct ib_gid_attr *sgid_attr,
816 int *hoplimit)
817{
818 struct rdma_dev_addr dev_addr;
819 struct resolve_cb_context ctx;
820 union {
821 struct sockaddr_in _sockaddr_in;
822 struct sockaddr_in6 _sockaddr_in6;
823 } sgid_addr, dgid_addr;
824 int ret;
825
826 rdma_gid2ip((struct sockaddr *)&sgid_addr, sgid);
827 rdma_gid2ip((struct sockaddr *)&dgid_addr, dgid);
828
829 memset(&dev_addr, 0, sizeof(dev_addr));
830 dev_addr.net = &init_net;
831 dev_addr.sgid_attr = sgid_attr;
832
833 init_completion(&ctx.comp);
834 ret = rdma_resolve_ip((struct sockaddr *)&sgid_addr,
835 (struct sockaddr *)&dgid_addr, &dev_addr, 1000,
836 resolve_cb, true, &ctx);
837 if (ret)
838 return ret;
839
840 wait_for_completion(&ctx.comp);
841
842 ret = ctx.status;
843 if (ret)
844 return ret;
845
846 memcpy(dmac, dev_addr.dst_dev_addr, ETH_ALEN);
847 *hoplimit = dev_addr.hoplimit;
848 return 0;
849}
850
851static int netevent_callback(struct notifier_block *self, unsigned long event,
852 void *ctx)
853{
854 struct addr_req *req;
855
856 if (event == NETEVENT_NEIGH_UPDATE) {
857 struct neighbour *neigh = ctx;
858
859 if (neigh->nud_state & NUD_VALID) {
860 spin_lock_bh(&lock);
861 list_for_each_entry(req, &req_list, list)
862 set_timeout(req, jiffies);
863 spin_unlock_bh(&lock);
864 }
865 }
866 return 0;
867}
868
869static struct notifier_block nb = {
870 .notifier_call = netevent_callback
871};
872
873int addr_init(void)
874{
875 addr_wq = alloc_ordered_workqueue("ib_addr", 0);
876 if (!addr_wq)
877 return -ENOMEM;
878
879 register_netevent_notifier(&nb);
880
881 return 0;
882}
883
884void addr_cleanup(void)
885{
886 unregister_netevent_notifier(&nb);
887 destroy_workqueue(addr_wq);
888 WARN_ON(!list_empty(&req_list));
889}