OpenWrt – Blame information for rev 4

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4 office 1 /*
2 * swconfig.c: Switch configuration API
3 *
4 * Copyright (C) 2008 Felix Fietkau <nbd@nbd.name>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 */
16  
17 #include <linux/types.h>
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/list.h>
21 #include <linux/if.h>
22 #include <linux/if_ether.h>
23 #include <linux/capability.h>
24 #include <linux/skbuff.h>
25 #include <linux/switch.h>
26 #include <linux/of.h>
27 #include <linux/version.h>
28 #include <uapi/linux/mii.h>
29  
30 #define SWCONFIG_DEVNAME "switch%d"
31  
32 #include "swconfig_leds.c"
33  
34 MODULE_AUTHOR("Felix Fietkau <nbd@nbd.name>");
35 MODULE_LICENSE("GPL");
36  
37 static int swdev_id;
38 static struct list_head swdevs;
39 static DEFINE_MUTEX(swdevs_lock);
40 struct swconfig_callback;
41  
42 struct swconfig_callback {
43 struct sk_buff *msg;
44 struct genlmsghdr *hdr;
45 struct genl_info *info;
46 int cmd;
47  
48 /* callback for filling in the message data */
49 int (*fill)(struct swconfig_callback *cb, void *arg);
50  
51 /* callback for closing the message before sending it */
52 int (*close)(struct swconfig_callback *cb, void *arg);
53  
54 struct nlattr *nest[4];
55 int args[4];
56 };
57  
58 /* defaults */
59  
60 static int
61 swconfig_get_vlan_ports(struct switch_dev *dev, const struct switch_attr *attr,
62 struct switch_val *val)
63 {
64 int ret;
65 if (val->port_vlan >= dev->vlans)
66 return -EINVAL;
67  
68 if (!dev->ops->get_vlan_ports)
69 return -EOPNOTSUPP;
70  
71 ret = dev->ops->get_vlan_ports(dev, val);
72 return ret;
73 }
74  
75 static int
76 swconfig_set_vlan_ports(struct switch_dev *dev, const struct switch_attr *attr,
77 struct switch_val *val)
78 {
79 struct switch_port *ports = val->value.ports;
80 const struct switch_dev_ops *ops = dev->ops;
81 int i;
82  
83 if (val->port_vlan >= dev->vlans)
84 return -EINVAL;
85  
86 /* validate ports */
87 if (val->len > dev->ports)
88 return -EINVAL;
89  
90 if (!ops->set_vlan_ports)
91 return -EOPNOTSUPP;
92  
93 for (i = 0; i < val->len; i++) {
94 if (ports[i].id >= dev->ports)
95 return -EINVAL;
96  
97 if (ops->set_port_pvid &&
98 !(ports[i].flags & (1 << SWITCH_PORT_FLAG_TAGGED)))
99 ops->set_port_pvid(dev, ports[i].id, val->port_vlan);
100 }
101  
102 return ops->set_vlan_ports(dev, val);
103 }
104  
105 static int
106 swconfig_set_pvid(struct switch_dev *dev, const struct switch_attr *attr,
107 struct switch_val *val)
108 {
109 if (val->port_vlan >= dev->ports)
110 return -EINVAL;
111  
112 if (!dev->ops->set_port_pvid)
113 return -EOPNOTSUPP;
114  
115 return dev->ops->set_port_pvid(dev, val->port_vlan, val->value.i);
116 }
117  
118 static int
119 swconfig_get_pvid(struct switch_dev *dev, const struct switch_attr *attr,
120 struct switch_val *val)
121 {
122 if (val->port_vlan >= dev->ports)
123 return -EINVAL;
124  
125 if (!dev->ops->get_port_pvid)
126 return -EOPNOTSUPP;
127  
128 return dev->ops->get_port_pvid(dev, val->port_vlan, &val->value.i);
129 }
130  
131 static int
132 swconfig_set_link(struct switch_dev *dev, const struct switch_attr *attr,
133 struct switch_val *val)
134 {
135 if (!dev->ops->set_port_link)
136 return -EOPNOTSUPP;
137  
138 return dev->ops->set_port_link(dev, val->port_vlan, val->value.link);
139 }
140  
141 static int
142 swconfig_get_link(struct switch_dev *dev, const struct switch_attr *attr,
143 struct switch_val *val)
144 {
145 struct switch_port_link *link = val->value.link;
146  
147 if (val->port_vlan >= dev->ports)
148 return -EINVAL;
149  
150 if (!dev->ops->get_port_link)
151 return -EOPNOTSUPP;
152  
153 memset(link, 0, sizeof(*link));
154 return dev->ops->get_port_link(dev, val->port_vlan, link);
155 }
156  
157 static int
158 swconfig_apply_config(struct switch_dev *dev, const struct switch_attr *attr,
159 struct switch_val *val)
160 {
161 /* don't complain if not supported by the switch driver */
162 if (!dev->ops->apply_config)
163 return 0;
164  
165 return dev->ops->apply_config(dev);
166 }
167  
168 static int
169 swconfig_reset_switch(struct switch_dev *dev, const struct switch_attr *attr,
170 struct switch_val *val)
171 {
172 /* don't complain if not supported by the switch driver */
173 if (!dev->ops->reset_switch)
174 return 0;
175  
176 return dev->ops->reset_switch(dev);
177 }
178  
179 enum global_defaults {
180 GLOBAL_APPLY,
181 GLOBAL_RESET,
182 };
183  
184 enum vlan_defaults {
185 VLAN_PORTS,
186 };
187  
188 enum port_defaults {
189 PORT_PVID,
190 PORT_LINK,
191 };
192  
193 static struct switch_attr default_global[] = {
194 [GLOBAL_APPLY] = {
195 .type = SWITCH_TYPE_NOVAL,
196 .name = "apply",
197 .description = "Activate changes in the hardware",
198 .set = swconfig_apply_config,
199 },
200 [GLOBAL_RESET] = {
201 .type = SWITCH_TYPE_NOVAL,
202 .name = "reset",
203 .description = "Reset the switch",
204 .set = swconfig_reset_switch,
205 }
206 };
207  
208 static struct switch_attr default_port[] = {
209 [PORT_PVID] = {
210 .type = SWITCH_TYPE_INT,
211 .name = "pvid",
212 .description = "Primary VLAN ID",
213 .set = swconfig_set_pvid,
214 .get = swconfig_get_pvid,
215 },
216 [PORT_LINK] = {
217 .type = SWITCH_TYPE_LINK,
218 .name = "link",
219 .description = "Get port link information",
220 .set = swconfig_set_link,
221 .get = swconfig_get_link,
222 }
223 };
224  
225 static struct switch_attr default_vlan[] = {
226 [VLAN_PORTS] = {
227 .type = SWITCH_TYPE_PORTS,
228 .name = "ports",
229 .description = "VLAN port mapping",
230 .set = swconfig_set_vlan_ports,
231 .get = swconfig_get_vlan_ports,
232 },
233 };
234  
235 static const struct switch_attr *
236 swconfig_find_attr_by_name(const struct switch_attrlist *alist,
237 const char *name)
238 {
239 int i;
240  
241 for (i = 0; i < alist->n_attr; i++)
242 if (strcmp(name, alist->attr[i].name) == 0)
243 return &alist->attr[i];
244  
245 return NULL;
246 }
247  
248 static void swconfig_defaults_init(struct switch_dev *dev)
249 {
250 const struct switch_dev_ops *ops = dev->ops;
251  
252 dev->def_global = 0;
253 dev->def_vlan = 0;
254 dev->def_port = 0;
255  
256 if (ops->get_vlan_ports || ops->set_vlan_ports)
257 set_bit(VLAN_PORTS, &dev->def_vlan);
258  
259 if (ops->get_port_pvid || ops->set_port_pvid)
260 set_bit(PORT_PVID, &dev->def_port);
261  
262 if (ops->get_port_link &&
263 !swconfig_find_attr_by_name(&ops->attr_port, "link"))
264 set_bit(PORT_LINK, &dev->def_port);
265  
266 /* always present, can be no-op */
267 set_bit(GLOBAL_APPLY, &dev->def_global);
268 set_bit(GLOBAL_RESET, &dev->def_global);
269 }
270  
271  
272 static struct genl_family switch_fam;
273  
274 static const struct nla_policy switch_policy[SWITCH_ATTR_MAX+1] = {
275 [SWITCH_ATTR_ID] = { .type = NLA_U32 },
276 [SWITCH_ATTR_OP_ID] = { .type = NLA_U32 },
277 [SWITCH_ATTR_OP_PORT] = { .type = NLA_U32 },
278 [SWITCH_ATTR_OP_VLAN] = { .type = NLA_U32 },
279 [SWITCH_ATTR_OP_VALUE_INT] = { .type = NLA_U32 },
280 [SWITCH_ATTR_OP_VALUE_STR] = { .type = NLA_NUL_STRING },
281 [SWITCH_ATTR_OP_VALUE_PORTS] = { .type = NLA_NESTED },
282 [SWITCH_ATTR_TYPE] = { .type = NLA_U32 },
283 };
284  
285 static const struct nla_policy port_policy[SWITCH_PORT_ATTR_MAX+1] = {
286 [SWITCH_PORT_ID] = { .type = NLA_U32 },
287 [SWITCH_PORT_FLAG_TAGGED] = { .type = NLA_FLAG },
288 };
289  
290 static struct nla_policy link_policy[SWITCH_LINK_ATTR_MAX] = {
291 [SWITCH_LINK_FLAG_DUPLEX] = { .type = NLA_FLAG },
292 [SWITCH_LINK_FLAG_ANEG] = { .type = NLA_FLAG },
293 [SWITCH_LINK_SPEED] = { .type = NLA_U32 },
294 };
295  
296 static inline void
297 swconfig_lock(void)
298 {
299 mutex_lock(&swdevs_lock);
300 }
301  
302 static inline void
303 swconfig_unlock(void)
304 {
305 mutex_unlock(&swdevs_lock);
306 }
307  
308 static struct switch_dev *
309 swconfig_get_dev(struct genl_info *info)
310 {
311 struct switch_dev *dev = NULL;
312 struct switch_dev *p;
313 int id;
314  
315 if (!info->attrs[SWITCH_ATTR_ID])
316 goto done;
317  
318 id = nla_get_u32(info->attrs[SWITCH_ATTR_ID]);
319 swconfig_lock();
320 list_for_each_entry(p, &swdevs, dev_list) {
321 if (id != p->id)
322 continue;
323  
324 dev = p;
325 break;
326 }
327 if (dev)
328 mutex_lock(&dev->sw_mutex);
329 else
330 pr_debug("device %d not found\n", id);
331 swconfig_unlock();
332 done:
333 return dev;
334 }
335  
336 static inline void
337 swconfig_put_dev(struct switch_dev *dev)
338 {
339 mutex_unlock(&dev->sw_mutex);
340 }
341  
342 static int
343 swconfig_dump_attr(struct swconfig_callback *cb, void *arg)
344 {
345 struct switch_attr *op = arg;
346 struct genl_info *info = cb->info;
347 struct sk_buff *msg = cb->msg;
348 int id = cb->args[0];
349 void *hdr;
350  
351 hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq, &switch_fam,
352 NLM_F_MULTI, SWITCH_CMD_NEW_ATTR);
353 if (IS_ERR(hdr))
354 return -1;
355  
356 if (nla_put_u32(msg, SWITCH_ATTR_OP_ID, id))
357 goto nla_put_failure;
358 if (nla_put_u32(msg, SWITCH_ATTR_OP_TYPE, op->type))
359 goto nla_put_failure;
360 if (nla_put_string(msg, SWITCH_ATTR_OP_NAME, op->name))
361 goto nla_put_failure;
362 if (op->description)
363 if (nla_put_string(msg, SWITCH_ATTR_OP_DESCRIPTION,
364 op->description))
365 goto nla_put_failure;
366  
367 genlmsg_end(msg, hdr);
368 return msg->len;
369 nla_put_failure:
370 genlmsg_cancel(msg, hdr);
371 return -EMSGSIZE;
372 }
373  
374 /* spread multipart messages across multiple message buffers */
375 static int
376 swconfig_send_multipart(struct swconfig_callback *cb, void *arg)
377 {
378 struct genl_info *info = cb->info;
379 int restart = 0;
380 int err;
381  
382 do {
383 if (!cb->msg) {
384 cb->msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
385 if (cb->msg == NULL)
386 goto error;
387 }
388  
389 if (!(cb->fill(cb, arg) < 0))
390 break;
391  
392 /* fill failed, check if this was already the second attempt */
393 if (restart)
394 goto error;
395  
396 /* try again in a new message, send the current one */
397 restart = 1;
398 if (cb->close) {
399 if (cb->close(cb, arg) < 0)
400 goto error;
401 }
402 err = genlmsg_reply(cb->msg, info);
403 cb->msg = NULL;
404 if (err < 0)
405 goto error;
406  
407 } while (restart);
408  
409 return 0;
410  
411 error:
412 if (cb->msg)
413 nlmsg_free(cb->msg);
414 return -1;
415 }
416  
417 static int
418 swconfig_list_attrs(struct sk_buff *skb, struct genl_info *info)
419 {
420 struct genlmsghdr *hdr = nlmsg_data(info->nlhdr);
421 const struct switch_attrlist *alist;
422 struct switch_dev *dev;
423 struct swconfig_callback cb;
424 int err = -EINVAL;
425 int i;
426  
427 /* defaults */
428 struct switch_attr *def_list;
429 unsigned long *def_active;
430 int n_def;
431  
432 dev = swconfig_get_dev(info);
433 if (!dev)
434 return -EINVAL;
435  
436 switch (hdr->cmd) {
437 case SWITCH_CMD_LIST_GLOBAL:
438 alist = &dev->ops->attr_global;
439 def_list = default_global;
440 def_active = &dev->def_global;
441 n_def = ARRAY_SIZE(default_global);
442 break;
443 case SWITCH_CMD_LIST_VLAN:
444 alist = &dev->ops->attr_vlan;
445 def_list = default_vlan;
446 def_active = &dev->def_vlan;
447 n_def = ARRAY_SIZE(default_vlan);
448 break;
449 case SWITCH_CMD_LIST_PORT:
450 alist = &dev->ops->attr_port;
451 def_list = default_port;
452 def_active = &dev->def_port;
453 n_def = ARRAY_SIZE(default_port);
454 break;
455 default:
456 WARN_ON(1);
457 goto out;
458 }
459  
460 memset(&cb, 0, sizeof(cb));
461 cb.info = info;
462 cb.fill = swconfig_dump_attr;
463 for (i = 0; i < alist->n_attr; i++) {
464 if (alist->attr[i].disabled)
465 continue;
466 cb.args[0] = i;
467 err = swconfig_send_multipart(&cb, (void *) &alist->attr[i]);
468 if (err < 0)
469 goto error;
470 }
471  
472 /* defaults */
473 for (i = 0; i < n_def; i++) {
474 if (!test_bit(i, def_active))
475 continue;
476 cb.args[0] = SWITCH_ATTR_DEFAULTS_OFFSET + i;
477 err = swconfig_send_multipart(&cb, (void *) &def_list[i]);
478 if (err < 0)
479 goto error;
480 }
481 swconfig_put_dev(dev);
482  
483 if (!cb.msg)
484 return 0;
485  
486 return genlmsg_reply(cb.msg, info);
487  
488 error:
489 if (cb.msg)
490 nlmsg_free(cb.msg);
491 out:
492 swconfig_put_dev(dev);
493 return err;
494 }
495  
496 static const struct switch_attr *
497 swconfig_lookup_attr(struct switch_dev *dev, struct genl_info *info,
498 struct switch_val *val)
499 {
500 struct genlmsghdr *hdr = nlmsg_data(info->nlhdr);
501 const struct switch_attrlist *alist;
502 const struct switch_attr *attr = NULL;
503 unsigned int attr_id;
504  
505 /* defaults */
506 struct switch_attr *def_list;
507 unsigned long *def_active;
508 int n_def;
509  
510 if (!info->attrs[SWITCH_ATTR_OP_ID])
511 goto done;
512  
513 switch (hdr->cmd) {
514 case SWITCH_CMD_SET_GLOBAL:
515 case SWITCH_CMD_GET_GLOBAL:
516 alist = &dev->ops->attr_global;
517 def_list = default_global;
518 def_active = &dev->def_global;
519 n_def = ARRAY_SIZE(default_global);
520 break;
521 case SWITCH_CMD_SET_VLAN:
522 case SWITCH_CMD_GET_VLAN:
523 alist = &dev->ops->attr_vlan;
524 def_list = default_vlan;
525 def_active = &dev->def_vlan;
526 n_def = ARRAY_SIZE(default_vlan);
527 if (!info->attrs[SWITCH_ATTR_OP_VLAN])
528 goto done;
529 val->port_vlan = nla_get_u32(info->attrs[SWITCH_ATTR_OP_VLAN]);
530 if (val->port_vlan >= dev->vlans)
531 goto done;
532 break;
533 case SWITCH_CMD_SET_PORT:
534 case SWITCH_CMD_GET_PORT:
535 alist = &dev->ops->attr_port;
536 def_list = default_port;
537 def_active = &dev->def_port;
538 n_def = ARRAY_SIZE(default_port);
539 if (!info->attrs[SWITCH_ATTR_OP_PORT])
540 goto done;
541 val->port_vlan = nla_get_u32(info->attrs[SWITCH_ATTR_OP_PORT]);
542 if (val->port_vlan >= dev->ports)
543 goto done;
544 break;
545 default:
546 WARN_ON(1);
547 goto done;
548 }
549  
550 if (!alist)
551 goto done;
552  
553 attr_id = nla_get_u32(info->attrs[SWITCH_ATTR_OP_ID]);
554 if (attr_id >= SWITCH_ATTR_DEFAULTS_OFFSET) {
555 attr_id -= SWITCH_ATTR_DEFAULTS_OFFSET;
556 if (attr_id >= n_def)
557 goto done;
558 if (!test_bit(attr_id, def_active))
559 goto done;
560 attr = &def_list[attr_id];
561 } else {
562 if (attr_id >= alist->n_attr)
563 goto done;
564 attr = &alist->attr[attr_id];
565 }
566  
567 if (attr->disabled)
568 attr = NULL;
569  
570 done:
571 if (!attr)
572 pr_debug("attribute lookup failed\n");
573 val->attr = attr;
574 return attr;
575 }
576  
577 static int
578 swconfig_parse_ports(struct sk_buff *msg, struct nlattr *head,
579 struct switch_val *val, int max)
580 {
581 struct nlattr *nla;
582 int rem;
583  
584 val->len = 0;
585 nla_for_each_nested(nla, head, rem) {
586 struct nlattr *tb[SWITCH_PORT_ATTR_MAX+1];
587 struct switch_port *port;
588  
589 if (val->len >= max)
590 return -EINVAL;
591  
592 port = &val->value.ports[val->len];
593  
594 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,12,0)
595 if (nla_parse_nested(tb, SWITCH_PORT_ATTR_MAX, nla,
596 port_policy))
597 #else
598 if (nla_parse_nested(tb, SWITCH_PORT_ATTR_MAX, nla,
599 port_policy, NULL))
600 #endif
601 return -EINVAL;
602  
603 if (!tb[SWITCH_PORT_ID])
604 return -EINVAL;
605  
606 port->id = nla_get_u32(tb[SWITCH_PORT_ID]);
607 if (tb[SWITCH_PORT_FLAG_TAGGED])
608 port->flags |= (1 << SWITCH_PORT_FLAG_TAGGED);
609 val->len++;
610 }
611  
612 return 0;
613 }
614  
615 static int
616 swconfig_parse_link(struct sk_buff *msg, struct nlattr *nla,
617 struct switch_port_link *link)
618 {
619 struct nlattr *tb[SWITCH_LINK_ATTR_MAX + 1];
620  
621 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,12,0)
622 if (nla_parse_nested(tb, SWITCH_LINK_ATTR_MAX, nla, link_policy))
623 #else
624 if (nla_parse_nested(tb, SWITCH_LINK_ATTR_MAX, nla, link_policy, NULL))
625 #endif
626 return -EINVAL;
627  
628 link->duplex = !!tb[SWITCH_LINK_FLAG_DUPLEX];
629 link->aneg = !!tb[SWITCH_LINK_FLAG_ANEG];
630 link->speed = nla_get_u32(tb[SWITCH_LINK_SPEED]);
631  
632 return 0;
633 }
634  
635 static int
636 swconfig_set_attr(struct sk_buff *skb, struct genl_info *info)
637 {
638 const struct switch_attr *attr;
639 struct switch_dev *dev;
640 struct switch_val val;
641 int err = -EINVAL;
642  
643 if (!capable(CAP_NET_ADMIN))
644 return -EPERM;
645  
646 dev = swconfig_get_dev(info);
647 if (!dev)
648 return -EINVAL;
649  
650 memset(&val, 0, sizeof(val));
651 attr = swconfig_lookup_attr(dev, info, &val);
652 if (!attr || !attr->set)
653 goto error;
654  
655 val.attr = attr;
656 switch (attr->type) {
657 case SWITCH_TYPE_NOVAL:
658 break;
659 case SWITCH_TYPE_INT:
660 if (!info->attrs[SWITCH_ATTR_OP_VALUE_INT])
661 goto error;
662 val.value.i =
663 nla_get_u32(info->attrs[SWITCH_ATTR_OP_VALUE_INT]);
664 break;
665 case SWITCH_TYPE_STRING:
666 if (!info->attrs[SWITCH_ATTR_OP_VALUE_STR])
667 goto error;
668 val.value.s =
669 nla_data(info->attrs[SWITCH_ATTR_OP_VALUE_STR]);
670 break;
671 case SWITCH_TYPE_PORTS:
672 val.value.ports = dev->portbuf;
673 memset(dev->portbuf, 0,
674 sizeof(struct switch_port) * dev->ports);
675  
676 /* TODO: implement multipart? */
677 if (info->attrs[SWITCH_ATTR_OP_VALUE_PORTS]) {
678 err = swconfig_parse_ports(skb,
679 info->attrs[SWITCH_ATTR_OP_VALUE_PORTS],
680 &val, dev->ports);
681 if (err < 0)
682 goto error;
683 } else {
684 val.len = 0;
685 err = 0;
686 }
687 break;
688 case SWITCH_TYPE_LINK:
689 val.value.link = &dev->linkbuf;
690 memset(&dev->linkbuf, 0, sizeof(struct switch_port_link));
691  
692 if (info->attrs[SWITCH_ATTR_OP_VALUE_LINK]) {
693 err = swconfig_parse_link(skb,
694 info->attrs[SWITCH_ATTR_OP_VALUE_LINK],
695 val.value.link);
696 if (err < 0)
697 goto error;
698 } else {
699 val.len = 0;
700 err = 0;
701 }
702 break;
703 default:
704 goto error;
705 }
706  
707 err = attr->set(dev, attr, &val);
708 error:
709 swconfig_put_dev(dev);
710 return err;
711 }
712  
713 static int
714 swconfig_close_portlist(struct swconfig_callback *cb, void *arg)
715 {
716 if (cb->nest[0])
717 nla_nest_end(cb->msg, cb->nest[0]);
718 return 0;
719 }
720  
721 static int
722 swconfig_send_port(struct swconfig_callback *cb, void *arg)
723 {
724 const struct switch_port *port = arg;
725 struct nlattr *p = NULL;
726  
727 if (!cb->nest[0]) {
728 cb->nest[0] = nla_nest_start(cb->msg, cb->cmd);
729 if (!cb->nest[0])
730 return -1;
731 }
732  
733 p = nla_nest_start(cb->msg, SWITCH_ATTR_PORT);
734 if (!p)
735 goto error;
736  
737 if (nla_put_u32(cb->msg, SWITCH_PORT_ID, port->id))
738 goto nla_put_failure;
739 if (port->flags & (1 << SWITCH_PORT_FLAG_TAGGED)) {
740 if (nla_put_flag(cb->msg, SWITCH_PORT_FLAG_TAGGED))
741 goto nla_put_failure;
742 }
743  
744 nla_nest_end(cb->msg, p);
745 return 0;
746  
747 nla_put_failure:
748 nla_nest_cancel(cb->msg, p);
749 error:
750 nla_nest_cancel(cb->msg, cb->nest[0]);
751 return -1;
752 }
753  
754 static int
755 swconfig_send_ports(struct sk_buff **msg, struct genl_info *info, int attr,
756 const struct switch_val *val)
757 {
758 struct swconfig_callback cb;
759 int err = 0;
760 int i;
761  
762 if (!val->value.ports)
763 return -EINVAL;
764  
765 memset(&cb, 0, sizeof(cb));
766 cb.cmd = attr;
767 cb.msg = *msg;
768 cb.info = info;
769 cb.fill = swconfig_send_port;
770 cb.close = swconfig_close_portlist;
771  
772 cb.nest[0] = nla_nest_start(cb.msg, cb.cmd);
773 for (i = 0; i < val->len; i++) {
774 err = swconfig_send_multipart(&cb, &val->value.ports[i]);
775 if (err)
776 goto done;
777 }
778 err = val->len;
779 swconfig_close_portlist(&cb, NULL);
780 *msg = cb.msg;
781  
782 done:
783 return err;
784 }
785  
786 static int
787 swconfig_send_link(struct sk_buff *msg, struct genl_info *info, int attr,
788 const struct switch_port_link *link)
789 {
790 struct nlattr *p = NULL;
791 int err = 0;
792  
793 p = nla_nest_start(msg, attr);
794 if (link->link) {
795 if (nla_put_flag(msg, SWITCH_LINK_FLAG_LINK))
796 goto nla_put_failure;
797 }
798 if (link->duplex) {
799 if (nla_put_flag(msg, SWITCH_LINK_FLAG_DUPLEX))
800 goto nla_put_failure;
801 }
802 if (link->aneg) {
803 if (nla_put_flag(msg, SWITCH_LINK_FLAG_ANEG))
804 goto nla_put_failure;
805 }
806 if (link->tx_flow) {
807 if (nla_put_flag(msg, SWITCH_LINK_FLAG_TX_FLOW))
808 goto nla_put_failure;
809 }
810 if (link->rx_flow) {
811 if (nla_put_flag(msg, SWITCH_LINK_FLAG_RX_FLOW))
812 goto nla_put_failure;
813 }
814 if (nla_put_u32(msg, SWITCH_LINK_SPEED, link->speed))
815 goto nla_put_failure;
816 if (link->eee & ADVERTISED_100baseT_Full) {
817 if (nla_put_flag(msg, SWITCH_LINK_FLAG_EEE_100BASET))
818 goto nla_put_failure;
819 }
820 if (link->eee & ADVERTISED_1000baseT_Full) {
821 if (nla_put_flag(msg, SWITCH_LINK_FLAG_EEE_1000BASET))
822 goto nla_put_failure;
823 }
824 nla_nest_end(msg, p);
825  
826 return err;
827  
828 nla_put_failure:
829 nla_nest_cancel(msg, p);
830 return -1;
831 }
832  
833 static int
834 swconfig_get_attr(struct sk_buff *skb, struct genl_info *info)
835 {
836 struct genlmsghdr *hdr = nlmsg_data(info->nlhdr);
837 const struct switch_attr *attr;
838 struct switch_dev *dev;
839 struct sk_buff *msg = NULL;
840 struct switch_val val;
841 int err = -EINVAL;
842 int cmd = hdr->cmd;
843  
844 dev = swconfig_get_dev(info);
845 if (!dev)
846 return -EINVAL;
847  
848 memset(&val, 0, sizeof(val));
849 attr = swconfig_lookup_attr(dev, info, &val);
850 if (!attr || !attr->get)
851 goto error;
852  
853 if (attr->type == SWITCH_TYPE_PORTS) {
854 val.value.ports = dev->portbuf;
855 memset(dev->portbuf, 0,
856 sizeof(struct switch_port) * dev->ports);
857 } else if (attr->type == SWITCH_TYPE_LINK) {
858 val.value.link = &dev->linkbuf;
859 memset(&dev->linkbuf, 0, sizeof(struct switch_port_link));
860 }
861  
862 err = attr->get(dev, attr, &val);
863 if (err)
864 goto error;
865  
866 msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
867 if (!msg)
868 goto error;
869  
870 hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq, &switch_fam,
871 0, cmd);
872 if (IS_ERR(hdr))
873 goto nla_put_failure;
874  
875 switch (attr->type) {
876 case SWITCH_TYPE_INT:
877 if (nla_put_u32(msg, SWITCH_ATTR_OP_VALUE_INT, val.value.i))
878 goto nla_put_failure;
879 break;
880 case SWITCH_TYPE_STRING:
881 if (nla_put_string(msg, SWITCH_ATTR_OP_VALUE_STR, val.value.s))
882 goto nla_put_failure;
883 break;
884 case SWITCH_TYPE_PORTS:
885 err = swconfig_send_ports(&msg, info,
886 SWITCH_ATTR_OP_VALUE_PORTS, &val);
887 if (err < 0)
888 goto nla_put_failure;
889 break;
890 case SWITCH_TYPE_LINK:
891 err = swconfig_send_link(msg, info,
892 SWITCH_ATTR_OP_VALUE_LINK, val.value.link);
893 if (err < 0)
894 goto nla_put_failure;
895 break;
896 default:
897 pr_debug("invalid type in attribute\n");
898 err = -EINVAL;
899 goto nla_put_failure;
900 }
901 genlmsg_end(msg, hdr);
902 err = msg->len;
903 if (err < 0)
904 goto nla_put_failure;
905  
906 swconfig_put_dev(dev);
907 return genlmsg_reply(msg, info);
908  
909 nla_put_failure:
910 if (msg)
911 nlmsg_free(msg);
912 error:
913 swconfig_put_dev(dev);
914 if (!err)
915 err = -ENOMEM;
916 return err;
917 }
918  
919 static int
920 swconfig_send_switch(struct sk_buff *msg, u32 pid, u32 seq, int flags,
921 const struct switch_dev *dev)
922 {
923 struct nlattr *p = NULL, *m = NULL;
924 void *hdr;
925 int i;
926  
927 hdr = genlmsg_put(msg, pid, seq, &switch_fam, flags,
928 SWITCH_CMD_NEW_ATTR);
929 if (IS_ERR(hdr))
930 return -1;
931  
932 if (nla_put_u32(msg, SWITCH_ATTR_ID, dev->id))
933 goto nla_put_failure;
934 if (nla_put_string(msg, SWITCH_ATTR_DEV_NAME, dev->devname))
935 goto nla_put_failure;
936 if (nla_put_string(msg, SWITCH_ATTR_ALIAS, dev->alias))
937 goto nla_put_failure;
938 if (nla_put_string(msg, SWITCH_ATTR_NAME, dev->name))
939 goto nla_put_failure;
940 if (nla_put_u32(msg, SWITCH_ATTR_VLANS, dev->vlans))
941 goto nla_put_failure;
942 if (nla_put_u32(msg, SWITCH_ATTR_PORTS, dev->ports))
943 goto nla_put_failure;
944 if (nla_put_u32(msg, SWITCH_ATTR_CPU_PORT, dev->cpu_port))
945 goto nla_put_failure;
946  
947 m = nla_nest_start(msg, SWITCH_ATTR_PORTMAP);
948 if (!m)
949 goto nla_put_failure;
950 for (i = 0; i < dev->ports; i++) {
951 p = nla_nest_start(msg, SWITCH_ATTR_PORTS);
952 if (!p)
953 continue;
954 if (dev->portmap[i].s) {
955 if (nla_put_string(msg, SWITCH_PORTMAP_SEGMENT,
956 dev->portmap[i].s))
957 goto nla_put_failure;
958 if (nla_put_u32(msg, SWITCH_PORTMAP_VIRT,
959 dev->portmap[i].virt))
960 goto nla_put_failure;
961 }
962 nla_nest_end(msg, p);
963 }
964 nla_nest_end(msg, m);
965 genlmsg_end(msg, hdr);
966 return msg->len;
967 nla_put_failure:
968 genlmsg_cancel(msg, hdr);
969 return -EMSGSIZE;
970 }
971  
972 static int swconfig_dump_switches(struct sk_buff *skb,
973 struct netlink_callback *cb)
974 {
975 struct switch_dev *dev;
976 int start = cb->args[0];
977 int idx = 0;
978  
979 swconfig_lock();
980 list_for_each_entry(dev, &swdevs, dev_list) {
981 if (++idx <= start)
982 continue;
983 if (swconfig_send_switch(skb, NETLINK_CB(cb->skb).portid,
984 cb->nlh->nlmsg_seq, NLM_F_MULTI,
985 dev) < 0)
986 break;
987 }
988 swconfig_unlock();
989 cb->args[0] = idx;
990  
991 return skb->len;
992 }
993  
994 static int
995 swconfig_done(struct netlink_callback *cb)
996 {
997 return 0;
998 }
999  
1000 static struct genl_ops swconfig_ops[] = {
1001 {
1002 .cmd = SWITCH_CMD_LIST_GLOBAL,
1003 .doit = swconfig_list_attrs,
1004 .policy = switch_policy,
1005 },
1006 {
1007 .cmd = SWITCH_CMD_LIST_VLAN,
1008 .doit = swconfig_list_attrs,
1009 .policy = switch_policy,
1010 },
1011 {
1012 .cmd = SWITCH_CMD_LIST_PORT,
1013 .doit = swconfig_list_attrs,
1014 .policy = switch_policy,
1015 },
1016 {
1017 .cmd = SWITCH_CMD_GET_GLOBAL,
1018 .doit = swconfig_get_attr,
1019 .policy = switch_policy,
1020 },
1021 {
1022 .cmd = SWITCH_CMD_GET_VLAN,
1023 .doit = swconfig_get_attr,
1024 .policy = switch_policy,
1025 },
1026 {
1027 .cmd = SWITCH_CMD_GET_PORT,
1028 .doit = swconfig_get_attr,
1029 .policy = switch_policy,
1030 },
1031 {
1032 .cmd = SWITCH_CMD_SET_GLOBAL,
1033 .flags = GENL_ADMIN_PERM,
1034 .doit = swconfig_set_attr,
1035 .policy = switch_policy,
1036 },
1037 {
1038 .cmd = SWITCH_CMD_SET_VLAN,
1039 .flags = GENL_ADMIN_PERM,
1040 .doit = swconfig_set_attr,
1041 .policy = switch_policy,
1042 },
1043 {
1044 .cmd = SWITCH_CMD_SET_PORT,
1045 .flags = GENL_ADMIN_PERM,
1046 .doit = swconfig_set_attr,
1047 .policy = switch_policy,
1048 },
1049 {
1050 .cmd = SWITCH_CMD_GET_SWITCH,
1051 .dumpit = swconfig_dump_switches,
1052 .policy = switch_policy,
1053 .done = swconfig_done,
1054 }
1055 };
1056  
1057 static struct genl_family switch_fam = {
1058 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,10,0)
1059 .id = GENL_ID_GENERATE,
1060 #endif
1061 .name = "switch",
1062 .hdrsize = 0,
1063 .version = 1,
1064 .maxattr = SWITCH_ATTR_MAX,
1065 .module = THIS_MODULE,
1066 .ops = swconfig_ops,
1067 .n_ops = ARRAY_SIZE(swconfig_ops),
1068 };
1069  
1070 #ifdef CONFIG_OF
1071 void
1072 of_switch_load_portmap(struct switch_dev *dev)
1073 {
1074 struct device_node *port;
1075  
1076 if (!dev->of_node)
1077 return;
1078  
1079 for_each_child_of_node(dev->of_node, port) {
1080 const __be32 *prop;
1081 const char *segment;
1082 int size, phys;
1083  
1084 if (!of_device_is_compatible(port, "swconfig,port"))
1085 continue;
1086  
1087 if (of_property_read_string(port, "swconfig,segment", &segment))
1088 continue;
1089  
1090 prop = of_get_property(port, "swconfig,portmap", &size);
1091 if (!prop)
1092 continue;
1093  
1094 if (size != (2 * sizeof(*prop))) {
1095 pr_err("%s: failed to parse port mapping\n",
1096 port->name);
1097 continue;
1098 }
1099  
1100 phys = be32_to_cpup(prop++);
1101 if ((phys < 0) | (phys >= dev->ports)) {
1102 pr_err("%s: physical port index out of range\n",
1103 port->name);
1104 continue;
1105 }
1106  
1107 dev->portmap[phys].s = kstrdup(segment, GFP_KERNEL);
1108 dev->portmap[phys].virt = be32_to_cpup(prop);
1109 pr_debug("Found port: %s, physical: %d, virtual: %d\n",
1110 segment, phys, dev->portmap[phys].virt);
1111 }
1112 }
1113 #endif
1114  
1115 int
1116 register_switch(struct switch_dev *dev, struct net_device *netdev)
1117 {
1118 struct switch_dev *sdev;
1119 const int max_switches = 8 * sizeof(unsigned long);
1120 unsigned long in_use = 0;
1121 int err;
1122 int i;
1123  
1124 INIT_LIST_HEAD(&dev->dev_list);
1125 if (netdev) {
1126 dev->netdev = netdev;
1127 if (!dev->alias)
1128 dev->alias = netdev->name;
1129 }
1130 BUG_ON(!dev->alias);
1131  
1132 /* Make sure swdev_id doesn't overflow */
1133 if (swdev_id == INT_MAX) {
1134 return -ENOMEM;
1135 }
1136  
1137 if (dev->ports > 0) {
1138 dev->portbuf = kzalloc(sizeof(struct switch_port) *
1139 dev->ports, GFP_KERNEL);
1140 if (!dev->portbuf)
1141 return -ENOMEM;
1142 dev->portmap = kzalloc(sizeof(struct switch_portmap) *
1143 dev->ports, GFP_KERNEL);
1144 if (!dev->portmap) {
1145 kfree(dev->portbuf);
1146 return -ENOMEM;
1147 }
1148 }
1149 swconfig_defaults_init(dev);
1150 mutex_init(&dev->sw_mutex);
1151 swconfig_lock();
1152 dev->id = ++swdev_id;
1153  
1154 list_for_each_entry(sdev, &swdevs, dev_list) {
1155 if (!sscanf(sdev->devname, SWCONFIG_DEVNAME, &i))
1156 continue;
1157 if (i < 0 || i > max_switches)
1158 continue;
1159  
1160 set_bit(i, &in_use);
1161 }
1162 i = find_first_zero_bit(&in_use, max_switches);
1163  
1164 if (i == max_switches) {
1165 swconfig_unlock();
1166 return -ENFILE;
1167 }
1168  
1169 #ifdef CONFIG_OF
1170 if (dev->ports)
1171 of_switch_load_portmap(dev);
1172 #endif
1173  
1174 /* fill device name */
1175 snprintf(dev->devname, IFNAMSIZ, SWCONFIG_DEVNAME, i);
1176  
1177 list_add_tail(&dev->dev_list, &swdevs);
1178 swconfig_unlock();
1179  
1180 err = swconfig_create_led_trigger(dev);
1181 if (err)
1182 return err;
1183  
1184 return 0;
1185 }
1186 EXPORT_SYMBOL_GPL(register_switch);
1187  
1188 void
1189 unregister_switch(struct switch_dev *dev)
1190 {
1191 swconfig_destroy_led_trigger(dev);
1192 kfree(dev->portbuf);
1193 mutex_lock(&dev->sw_mutex);
1194 swconfig_lock();
1195 list_del(&dev->dev_list);
1196 swconfig_unlock();
1197 mutex_unlock(&dev->sw_mutex);
1198 }
1199 EXPORT_SYMBOL_GPL(unregister_switch);
1200  
1201 int
1202 switch_generic_set_link(struct switch_dev *dev, int port,
1203 struct switch_port_link *link)
1204 {
1205 if (WARN_ON(!dev->ops->phy_write16))
1206 return -ENOTSUPP;
1207  
1208 /* Generic implementation */
1209 if (link->aneg) {
1210 dev->ops->phy_write16(dev, port, MII_BMCR, 0x0000);
1211 dev->ops->phy_write16(dev, port, MII_BMCR, BMCR_ANENABLE | BMCR_ANRESTART);
1212 } else {
1213 u16 bmcr = 0;
1214  
1215 if (link->duplex)
1216 bmcr |= BMCR_FULLDPLX;
1217  
1218 switch (link->speed) {
1219 case SWITCH_PORT_SPEED_10:
1220 break;
1221 case SWITCH_PORT_SPEED_100:
1222 bmcr |= BMCR_SPEED100;
1223 break;
1224 case SWITCH_PORT_SPEED_1000:
1225 bmcr |= BMCR_SPEED1000;
1226 break;
1227 default:
1228 return -ENOTSUPP;
1229 }
1230  
1231 dev->ops->phy_write16(dev, port, MII_BMCR, bmcr);
1232 }
1233  
1234 return 0;
1235 }
1236  
1237 static int __init
1238 swconfig_init(void)
1239 {
1240 INIT_LIST_HEAD(&swdevs);
1241  
1242 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,10,0)
1243 return genl_register_family_with_ops(&switch_fam, swconfig_ops);
1244 #else
1245 return genl_register_family(&switch_fam);
1246 #endif
1247 }
1248  
1249 static void __exit
1250 swconfig_exit(void)
1251 {
1252 genl_unregister_family(&switch_fam);
1253 }
1254  
1255 module_init(swconfig_init);
1256 module_exit(swconfig_exit);