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Linux/net/hsr/hsr_netlink.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /* Copyright 2011-2014 Autronica Fire and Security AS
  3  *
  4  * Author(s):
  5  *      2011-2014 Arvid Brodin, arvid.brodin@alten.se
  6  *
  7  * Routines for handling Netlink messages for HSR.
  8  */
  9 
 10 #include "hsr_netlink.h"
 11 #include <linux/kernel.h>
 12 #include <net/rtnetlink.h>
 13 #include <net/genetlink.h>
 14 #include "hsr_main.h"
 15 #include "hsr_device.h"
 16 #include "hsr_framereg.h"
 17 
 18 static const struct nla_policy hsr_policy[IFLA_HSR_MAX + 1] = {
 19         [IFLA_HSR_SLAVE1]               = { .type = NLA_U32 },
 20         [IFLA_HSR_SLAVE2]               = { .type = NLA_U32 },
 21         [IFLA_HSR_MULTICAST_SPEC]       = { .type = NLA_U8 },
 22         [IFLA_HSR_VERSION]      = { .type = NLA_U8 },
 23         [IFLA_HSR_SUPERVISION_ADDR]     = { .len = ETH_ALEN },
 24         [IFLA_HSR_SEQ_NR]               = { .type = NLA_U16 },
 25 };
 26 
 27 /* Here, it seems a netdevice has already been allocated for us, and the
 28  * hsr_dev_setup routine has been executed. Nice!
 29  */
 30 static int hsr_newlink(struct net *src_net, struct net_device *dev,
 31                        struct nlattr *tb[], struct nlattr *data[],
 32                        struct netlink_ext_ack *extack)
 33 {
 34         struct net_device *link[2];
 35         unsigned char multicast_spec, hsr_version;
 36 
 37         if (!data) {
 38                 netdev_info(dev, "HSR: No slave devices specified\n");
 39                 return -EINVAL;
 40         }
 41         if (!data[IFLA_HSR_SLAVE1]) {
 42                 netdev_info(dev, "HSR: Slave1 device not specified\n");
 43                 return -EINVAL;
 44         }
 45         link[0] = __dev_get_by_index(src_net,
 46                                      nla_get_u32(data[IFLA_HSR_SLAVE1]));
 47         if (!data[IFLA_HSR_SLAVE2]) {
 48                 netdev_info(dev, "HSR: Slave2 device not specified\n");
 49                 return -EINVAL;
 50         }
 51         link[1] = __dev_get_by_index(src_net,
 52                                      nla_get_u32(data[IFLA_HSR_SLAVE2]));
 53 
 54         if (!link[0] || !link[1])
 55                 return -ENODEV;
 56         if (link[0] == link[1])
 57                 return -EINVAL;
 58 
 59         if (!data[IFLA_HSR_MULTICAST_SPEC])
 60                 multicast_spec = 0;
 61         else
 62                 multicast_spec = nla_get_u8(data[IFLA_HSR_MULTICAST_SPEC]);
 63 
 64         if (!data[IFLA_HSR_VERSION])
 65                 hsr_version = 0;
 66         else
 67                 hsr_version = nla_get_u8(data[IFLA_HSR_VERSION]);
 68 
 69         return hsr_dev_finalize(dev, link, multicast_spec, hsr_version);
 70 }
 71 
 72 static int hsr_fill_info(struct sk_buff *skb, const struct net_device *dev)
 73 {
 74         struct hsr_priv *hsr;
 75         struct hsr_port *port;
 76         int res;
 77 
 78         hsr = netdev_priv(dev);
 79 
 80         res = 0;
 81 
 82         rcu_read_lock();
 83         port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A);
 84         if (port)
 85                 res = nla_put_u32(skb, IFLA_HSR_SLAVE1, port->dev->ifindex);
 86         rcu_read_unlock();
 87         if (res)
 88                 goto nla_put_failure;
 89 
 90         rcu_read_lock();
 91         port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
 92         if (port)
 93                 res = nla_put_u32(skb, IFLA_HSR_SLAVE2, port->dev->ifindex);
 94         rcu_read_unlock();
 95         if (res)
 96                 goto nla_put_failure;
 97 
 98         if (nla_put(skb, IFLA_HSR_SUPERVISION_ADDR, ETH_ALEN,
 99                     hsr->sup_multicast_addr) ||
100             nla_put_u16(skb, IFLA_HSR_SEQ_NR, hsr->sequence_nr))
101                 goto nla_put_failure;
102 
103         return 0;
104 
105 nla_put_failure:
106         return -EMSGSIZE;
107 }
108 
109 static struct rtnl_link_ops hsr_link_ops __read_mostly = {
110         .kind           = "hsr",
111         .maxtype        = IFLA_HSR_MAX,
112         .policy         = hsr_policy,
113         .priv_size      = sizeof(struct hsr_priv),
114         .setup          = hsr_dev_setup,
115         .newlink        = hsr_newlink,
116         .fill_info      = hsr_fill_info,
117 };
118 
119 /* attribute policy */
120 static const struct nla_policy hsr_genl_policy[HSR_A_MAX + 1] = {
121         [HSR_A_NODE_ADDR] = { .len = ETH_ALEN },
122         [HSR_A_NODE_ADDR_B] = { .len = ETH_ALEN },
123         [HSR_A_IFINDEX] = { .type = NLA_U32 },
124         [HSR_A_IF1_AGE] = { .type = NLA_U32 },
125         [HSR_A_IF2_AGE] = { .type = NLA_U32 },
126         [HSR_A_IF1_SEQ] = { .type = NLA_U16 },
127         [HSR_A_IF2_SEQ] = { .type = NLA_U16 },
128 };
129 
130 static struct genl_family hsr_genl_family;
131 
132 static const struct genl_multicast_group hsr_mcgrps[] = {
133         { .name = "hsr-network", },
134 };
135 
136 /* This is called if for some node with MAC address addr, we only get frames
137  * over one of the slave interfaces. This would indicate an open network ring
138  * (i.e. a link has failed somewhere).
139  */
140 void hsr_nl_ringerror(struct hsr_priv *hsr, unsigned char addr[ETH_ALEN],
141                       struct hsr_port *port)
142 {
143         struct sk_buff *skb;
144         void *msg_head;
145         struct hsr_port *master;
146         int res;
147 
148         skb = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
149         if (!skb)
150                 goto fail;
151 
152         msg_head = genlmsg_put(skb, 0, 0, &hsr_genl_family, 0,
153                                HSR_C_RING_ERROR);
154         if (!msg_head)
155                 goto nla_put_failure;
156 
157         res = nla_put(skb, HSR_A_NODE_ADDR, ETH_ALEN, addr);
158         if (res < 0)
159                 goto nla_put_failure;
160 
161         res = nla_put_u32(skb, HSR_A_IFINDEX, port->dev->ifindex);
162         if (res < 0)
163                 goto nla_put_failure;
164 
165         genlmsg_end(skb, msg_head);
166         genlmsg_multicast(&hsr_genl_family, skb, 0, 0, GFP_ATOMIC);
167 
168         return;
169 
170 nla_put_failure:
171         kfree_skb(skb);
172 
173 fail:
174         rcu_read_lock();
175         master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
176         netdev_warn(master->dev, "Could not send HSR ring error message\n");
177         rcu_read_unlock();
178 }
179 
180 /* This is called when we haven't heard from the node with MAC address addr for
181  * some time (just before the node is removed from the node table/list).
182  */
183 void hsr_nl_nodedown(struct hsr_priv *hsr, unsigned char addr[ETH_ALEN])
184 {
185         struct sk_buff *skb;
186         void *msg_head;
187         struct hsr_port *master;
188         int res;
189 
190         skb = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
191         if (!skb)
192                 goto fail;
193 
194         msg_head = genlmsg_put(skb, 0, 0, &hsr_genl_family, 0, HSR_C_NODE_DOWN);
195         if (!msg_head)
196                 goto nla_put_failure;
197 
198         res = nla_put(skb, HSR_A_NODE_ADDR, ETH_ALEN, addr);
199         if (res < 0)
200                 goto nla_put_failure;
201 
202         genlmsg_end(skb, msg_head);
203         genlmsg_multicast(&hsr_genl_family, skb, 0, 0, GFP_ATOMIC);
204 
205         return;
206 
207 nla_put_failure:
208         kfree_skb(skb);
209 
210 fail:
211         rcu_read_lock();
212         master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
213         netdev_warn(master->dev, "Could not send HSR node down\n");
214         rcu_read_unlock();
215 }
216 
217 /* HSR_C_GET_NODE_STATUS lets userspace query the internal HSR node table
218  * about the status of a specific node in the network, defined by its MAC
219  * address.
220  *
221  * Input: hsr ifindex, node mac address
222  * Output: hsr ifindex, node mac address (copied from request),
223  *         age of latest frame from node over slave 1, slave 2 [ms]
224  */
225 static int hsr_get_node_status(struct sk_buff *skb_in, struct genl_info *info)
226 {
227         /* For receiving */
228         struct nlattr *na;
229         struct net_device *hsr_dev;
230 
231         /* For sending */
232         struct sk_buff *skb_out;
233         void *msg_head;
234         struct hsr_priv *hsr;
235         struct hsr_port *port;
236         unsigned char hsr_node_addr_b[ETH_ALEN];
237         int hsr_node_if1_age;
238         u16 hsr_node_if1_seq;
239         int hsr_node_if2_age;
240         u16 hsr_node_if2_seq;
241         int addr_b_ifindex;
242         int res;
243 
244         if (!info)
245                 goto invalid;
246 
247         na = info->attrs[HSR_A_IFINDEX];
248         if (!na)
249                 goto invalid;
250         na = info->attrs[HSR_A_NODE_ADDR];
251         if (!na)
252                 goto invalid;
253 
254         hsr_dev = __dev_get_by_index(genl_info_net(info),
255                                      nla_get_u32(info->attrs[HSR_A_IFINDEX]));
256         if (!hsr_dev)
257                 goto invalid;
258         if (!is_hsr_master(hsr_dev))
259                 goto invalid;
260 
261         /* Send reply */
262         skb_out = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
263         if (!skb_out) {
264                 res = -ENOMEM;
265                 goto fail;
266         }
267 
268         msg_head = genlmsg_put(skb_out, NETLINK_CB(skb_in).portid,
269                                info->snd_seq, &hsr_genl_family, 0,
270                                HSR_C_SET_NODE_STATUS);
271         if (!msg_head) {
272                 res = -ENOMEM;
273                 goto nla_put_failure;
274         }
275 
276         res = nla_put_u32(skb_out, HSR_A_IFINDEX, hsr_dev->ifindex);
277         if (res < 0)
278                 goto nla_put_failure;
279 
280         hsr = netdev_priv(hsr_dev);
281         res = hsr_get_node_data(hsr,
282                                 (unsigned char *)
283                                 nla_data(info->attrs[HSR_A_NODE_ADDR]),
284                                          hsr_node_addr_b,
285                                          &addr_b_ifindex,
286                                          &hsr_node_if1_age,
287                                          &hsr_node_if1_seq,
288                                          &hsr_node_if2_age,
289                                          &hsr_node_if2_seq);
290         if (res < 0)
291                 goto nla_put_failure;
292 
293         res = nla_put(skb_out, HSR_A_NODE_ADDR, ETH_ALEN,
294                       nla_data(info->attrs[HSR_A_NODE_ADDR]));
295         if (res < 0)
296                 goto nla_put_failure;
297 
298         if (addr_b_ifindex > -1) {
299                 res = nla_put(skb_out, HSR_A_NODE_ADDR_B, ETH_ALEN,
300                               hsr_node_addr_b);
301                 if (res < 0)
302                         goto nla_put_failure;
303 
304                 res = nla_put_u32(skb_out, HSR_A_ADDR_B_IFINDEX,
305                                   addr_b_ifindex);
306                 if (res < 0)
307                         goto nla_put_failure;
308         }
309 
310         res = nla_put_u32(skb_out, HSR_A_IF1_AGE, hsr_node_if1_age);
311         if (res < 0)
312                 goto nla_put_failure;
313         res = nla_put_u16(skb_out, HSR_A_IF1_SEQ, hsr_node_if1_seq);
314         if (res < 0)
315                 goto nla_put_failure;
316         rcu_read_lock();
317         port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A);
318         if (port)
319                 res = nla_put_u32(skb_out, HSR_A_IF1_IFINDEX,
320                                   port->dev->ifindex);
321         rcu_read_unlock();
322         if (res < 0)
323                 goto nla_put_failure;
324 
325         res = nla_put_u32(skb_out, HSR_A_IF2_AGE, hsr_node_if2_age);
326         if (res < 0)
327                 goto nla_put_failure;
328         res = nla_put_u16(skb_out, HSR_A_IF2_SEQ, hsr_node_if2_seq);
329         if (res < 0)
330                 goto nla_put_failure;
331         rcu_read_lock();
332         port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
333         if (port)
334                 res = nla_put_u32(skb_out, HSR_A_IF2_IFINDEX,
335                                   port->dev->ifindex);
336         rcu_read_unlock();
337         if (res < 0)
338                 goto nla_put_failure;
339 
340         genlmsg_end(skb_out, msg_head);
341         genlmsg_unicast(genl_info_net(info), skb_out, info->snd_portid);
342 
343         return 0;
344 
345 invalid:
346         netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL, NULL);
347         return 0;
348 
349 nla_put_failure:
350         kfree_skb(skb_out);
351         /* Fall through */
352 
353 fail:
354         return res;
355 }
356 
357 /* Get a list of MacAddressA of all nodes known to this node (including self).
358  */
359 static int hsr_get_node_list(struct sk_buff *skb_in, struct genl_info *info)
360 {
361         /* For receiving */
362         struct nlattr *na;
363         struct net_device *hsr_dev;
364 
365         /* For sending */
366         struct sk_buff *skb_out;
367         void *msg_head;
368         struct hsr_priv *hsr;
369         void *pos;
370         unsigned char addr[ETH_ALEN];
371         int res;
372 
373         if (!info)
374                 goto invalid;
375 
376         na = info->attrs[HSR_A_IFINDEX];
377         if (!na)
378                 goto invalid;
379 
380         hsr_dev = __dev_get_by_index(genl_info_net(info),
381                                      nla_get_u32(info->attrs[HSR_A_IFINDEX]));
382         if (!hsr_dev)
383                 goto invalid;
384         if (!is_hsr_master(hsr_dev))
385                 goto invalid;
386 
387         /* Send reply */
388         skb_out = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
389         if (!skb_out) {
390                 res = -ENOMEM;
391                 goto fail;
392         }
393 
394         msg_head = genlmsg_put(skb_out, NETLINK_CB(skb_in).portid,
395                                info->snd_seq, &hsr_genl_family, 0,
396                                HSR_C_SET_NODE_LIST);
397         if (!msg_head) {
398                 res = -ENOMEM;
399                 goto nla_put_failure;
400         }
401 
402         res = nla_put_u32(skb_out, HSR_A_IFINDEX, hsr_dev->ifindex);
403         if (res < 0)
404                 goto nla_put_failure;
405 
406         hsr = netdev_priv(hsr_dev);
407 
408         rcu_read_lock();
409         pos = hsr_get_next_node(hsr, NULL, addr);
410         while (pos) {
411                 res = nla_put(skb_out, HSR_A_NODE_ADDR, ETH_ALEN, addr);
412                 if (res < 0) {
413                         rcu_read_unlock();
414                         goto nla_put_failure;
415                 }
416                 pos = hsr_get_next_node(hsr, pos, addr);
417         }
418         rcu_read_unlock();
419 
420         genlmsg_end(skb_out, msg_head);
421         genlmsg_unicast(genl_info_net(info), skb_out, info->snd_portid);
422 
423         return 0;
424 
425 invalid:
426         netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL, NULL);
427         return 0;
428 
429 nla_put_failure:
430         kfree_skb(skb_out);
431         /* Fall through */
432 
433 fail:
434         return res;
435 }
436 
437 static const struct genl_ops hsr_ops[] = {
438         {
439                 .cmd = HSR_C_GET_NODE_STATUS,
440                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
441                 .flags = 0,
442                 .doit = hsr_get_node_status,
443                 .dumpit = NULL,
444         },
445         {
446                 .cmd = HSR_C_GET_NODE_LIST,
447                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
448                 .flags = 0,
449                 .doit = hsr_get_node_list,
450                 .dumpit = NULL,
451         },
452 };
453 
454 static struct genl_family hsr_genl_family __ro_after_init = {
455         .hdrsize = 0,
456         .name = "HSR",
457         .version = 1,
458         .maxattr = HSR_A_MAX,
459         .policy = hsr_genl_policy,
460         .module = THIS_MODULE,
461         .ops = hsr_ops,
462         .n_ops = ARRAY_SIZE(hsr_ops),
463         .mcgrps = hsr_mcgrps,
464         .n_mcgrps = ARRAY_SIZE(hsr_mcgrps),
465 };
466 
467 int __init hsr_netlink_init(void)
468 {
469         int rc;
470 
471         rc = rtnl_link_register(&hsr_link_ops);
472         if (rc)
473                 goto fail_rtnl_link_register;
474 
475         rc = genl_register_family(&hsr_genl_family);
476         if (rc)
477                 goto fail_genl_register_family;
478 
479         return 0;
480 
481 fail_genl_register_family:
482         rtnl_link_unregister(&hsr_link_ops);
483 fail_rtnl_link_register:
484 
485         return rc;
486 }
487 
488 void __exit hsr_netlink_exit(void)
489 {
490         genl_unregister_family(&hsr_genl_family);
491         rtnl_link_unregister(&hsr_link_ops);
492 }
493 
494 MODULE_ALIAS_RTNL_LINK("hsr");
495 

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