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37#include <net/sock.h>
38#include "core.h"
39#include "bearer.h"
40#include "link.h"
41#include "discover.h"
42#include "bcast.h"
43#include "netlink.h"
44
45#define MAX_ADDR_STR 60
46
47static struct tipc_media * const media_info_array[] = {
48 ð_media_info,
49#ifdef CONFIG_TIPC_MEDIA_IB
50 &ib_media_info,
51#endif
52#ifdef CONFIG_TIPC_MEDIA_UDP
53 &udp_media_info,
54#endif
55 NULL
56};
57
58static void bearer_disable(struct net *net, struct tipc_bearer *b);
59
60
61
62
63struct tipc_media *tipc_media_find(const char *name)
64{
65 u32 i;
66
67 for (i = 0; media_info_array[i] != NULL; i++) {
68 if (!strcmp(media_info_array[i]->name, name))
69 break;
70 }
71 return media_info_array[i];
72}
73
74
75
76
77static struct tipc_media *media_find_id(u8 type)
78{
79 u32 i;
80
81 for (i = 0; media_info_array[i] != NULL; i++) {
82 if (media_info_array[i]->type_id == type)
83 break;
84 }
85 return media_info_array[i];
86}
87
88
89
90
91void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a)
92{
93 char addr_str[MAX_ADDR_STR];
94 struct tipc_media *m;
95 int ret;
96
97 m = media_find_id(a->media_id);
98
99 if (m && !m->addr2str(a, addr_str, sizeof(addr_str)))
100 ret = scnprintf(buf, len, "%s(%s)", m->name, addr_str);
101 else {
102 u32 i;
103
104 ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id);
105 for (i = 0; i < sizeof(a->value); i++)
106 ret += scnprintf(buf - ret, len + ret,
107 "-%02x", a->value[i]);
108 }
109}
110
111
112
113
114
115
116
117
118static int bearer_name_validate(const char *name,
119 struct tipc_bearer_names *name_parts)
120{
121 char name_copy[TIPC_MAX_BEARER_NAME];
122 char *media_name;
123 char *if_name;
124 u32 media_len;
125 u32 if_len;
126
127
128 name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
129
130 strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
131 if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
132 return 0;
133
134
135 media_name = name_copy;
136 if_name = strchr(media_name, ':');
137 if (if_name == NULL)
138 return 0;
139 *(if_name++) = 0;
140 media_len = if_name - media_name;
141 if_len = strlen(if_name) + 1;
142
143
144 if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
145 (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME))
146 return 0;
147
148
149 if (name_parts) {
150 strcpy(name_parts->media_name, media_name);
151 strcpy(name_parts->if_name, if_name);
152 }
153 return 1;
154}
155
156
157
158
159struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name)
160{
161 struct tipc_net *tn = net_generic(net, tipc_net_id);
162 struct tipc_bearer *b;
163 u32 i;
164
165 for (i = 0; i < MAX_BEARERS; i++) {
166 b = rtnl_dereference(tn->bearer_list[i]);
167 if (b && (!strcmp(b->name, name)))
168 return b;
169 }
170 return NULL;
171}
172
173void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest)
174{
175 struct tipc_net *tn = net_generic(net, tipc_net_id);
176 struct tipc_bearer *b;
177
178 rcu_read_lock();
179 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
180 if (b)
181 tipc_disc_add_dest(b->link_req);
182 rcu_read_unlock();
183}
184
185void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest)
186{
187 struct tipc_net *tn = net_generic(net, tipc_net_id);
188 struct tipc_bearer *b;
189
190 rcu_read_lock();
191 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
192 if (b)
193 tipc_disc_remove_dest(b->link_req);
194 rcu_read_unlock();
195}
196
197
198
199
200static int tipc_enable_bearer(struct net *net, const char *name,
201 u32 disc_domain, u32 priority,
202 struct nlattr *attr[])
203{
204 struct tipc_net *tn = net_generic(net, tipc_net_id);
205 struct tipc_bearer *b;
206 struct tipc_media *m;
207 struct tipc_bearer_names b_names;
208 char addr_string[16];
209 u32 bearer_id;
210 u32 with_this_prio;
211 u32 i;
212 int res = -EINVAL;
213
214 if (!tn->own_addr) {
215 pr_warn("Bearer <%s> rejected, not supported in standalone mode\n",
216 name);
217 return -ENOPROTOOPT;
218 }
219 if (!bearer_name_validate(name, &b_names)) {
220 pr_warn("Bearer <%s> rejected, illegal name\n", name);
221 return -EINVAL;
222 }
223 if (tipc_addr_domain_valid(disc_domain) &&
224 (disc_domain != tn->own_addr)) {
225 if (tipc_in_scope(disc_domain, tn->own_addr)) {
226 disc_domain = tn->own_addr & TIPC_CLUSTER_MASK;
227 res = 0;
228 } else if (in_own_cluster_exact(net, disc_domain))
229 res = 0;
230 }
231 if (res) {
232 pr_warn("Bearer <%s> rejected, illegal discovery domain\n",
233 name);
234 return -EINVAL;
235 }
236 if ((priority > TIPC_MAX_LINK_PRI) &&
237 (priority != TIPC_MEDIA_LINK_PRI)) {
238 pr_warn("Bearer <%s> rejected, illegal priority\n", name);
239 return -EINVAL;
240 }
241
242 m = tipc_media_find(b_names.media_name);
243 if (!m) {
244 pr_warn("Bearer <%s> rejected, media <%s> not registered\n",
245 name, b_names.media_name);
246 return -EINVAL;
247 }
248
249 if (priority == TIPC_MEDIA_LINK_PRI)
250 priority = m->priority;
251
252restart:
253 bearer_id = MAX_BEARERS;
254 with_this_prio = 1;
255 for (i = MAX_BEARERS; i-- != 0; ) {
256 b = rtnl_dereference(tn->bearer_list[i]);
257 if (!b) {
258 bearer_id = i;
259 continue;
260 }
261 if (!strcmp(name, b->name)) {
262 pr_warn("Bearer <%s> rejected, already enabled\n",
263 name);
264 return -EINVAL;
265 }
266 if ((b->priority == priority) &&
267 (++with_this_prio > 2)) {
268 if (priority-- == 0) {
269 pr_warn("Bearer <%s> rejected, duplicate priority\n",
270 name);
271 return -EINVAL;
272 }
273 pr_warn("Bearer <%s> priority adjustment required %u->%u\n",
274 name, priority + 1, priority);
275 goto restart;
276 }
277 }
278 if (bearer_id >= MAX_BEARERS) {
279 pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
280 name, MAX_BEARERS);
281 return -EINVAL;
282 }
283
284 b = kzalloc(sizeof(*b), GFP_ATOMIC);
285 if (!b)
286 return -ENOMEM;
287
288 strcpy(b->name, name);
289 b->media = m;
290 res = m->enable_media(net, b, attr);
291 if (res) {
292 pr_warn("Bearer <%s> rejected, enable failure (%d)\n",
293 name, -res);
294 return -EINVAL;
295 }
296
297 b->identity = bearer_id;
298 b->tolerance = m->tolerance;
299 b->window = m->window;
300 b->domain = disc_domain;
301 b->net_plane = bearer_id + 'A';
302 b->priority = priority;
303
304 res = tipc_disc_create(net, b, &b->bcast_addr);
305 if (res) {
306 bearer_disable(net, b);
307 pr_warn("Bearer <%s> rejected, discovery object creation failed\n",
308 name);
309 return -EINVAL;
310 }
311
312 rcu_assign_pointer(tn->bearer_list[bearer_id], b);
313
314 pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
315 name,
316 tipc_addr_string_fill(addr_string, disc_domain), priority);
317 return res;
318}
319
320
321
322
323static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b)
324{
325 pr_info("Resetting bearer <%s>\n", b->name);
326 tipc_node_delete_links(net, b->identity);
327 tipc_disc_reset(net, b);
328 return 0;
329}
330
331
332
333
334
335
336static void bearer_disable(struct net *net, struct tipc_bearer *b)
337{
338 struct tipc_net *tn = net_generic(net, tipc_net_id);
339 u32 i;
340
341 pr_info("Disabling bearer <%s>\n", b->name);
342 b->media->disable_media(b);
343
344 tipc_node_delete_links(net, b->identity);
345 RCU_INIT_POINTER(b->media_ptr, NULL);
346 if (b->link_req)
347 tipc_disc_delete(b->link_req);
348
349 for (i = 0; i < MAX_BEARERS; i++) {
350 if (b == rtnl_dereference(tn->bearer_list[i])) {
351 RCU_INIT_POINTER(tn->bearer_list[i], NULL);
352 break;
353 }
354 }
355 kfree_rcu(b, rcu);
356}
357
358int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
359 struct nlattr *attr[])
360{
361 struct net_device *dev;
362 char *driver_name = strchr((const char *)b->name, ':') + 1;
363
364
365 dev = dev_get_by_name(net, driver_name);
366 if (!dev)
367 return -ENODEV;
368
369
370 rcu_assign_pointer(b->media_ptr, dev);
371 memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
372 memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len);
373 b->bcast_addr.media_id = b->media->type_id;
374 b->bcast_addr.broadcast = 1;
375 b->mtu = dev->mtu;
376 b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
377 rcu_assign_pointer(dev->tipc_ptr, b);
378 return 0;
379}
380
381
382
383
384
385void tipc_disable_l2_media(struct tipc_bearer *b)
386{
387 struct net_device *dev;
388
389 dev = (struct net_device *)rtnl_dereference(b->media_ptr);
390 RCU_INIT_POINTER(dev->tipc_ptr, NULL);
391 synchronize_net();
392 dev_put(dev);
393}
394
395
396
397
398
399
400
401int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
402 struct tipc_bearer *b, struct tipc_media_addr *dest)
403{
404 struct net_device *dev;
405 int delta;
406
407 dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr);
408 if (!dev)
409 return 0;
410
411 delta = dev->hard_header_len - skb_headroom(skb);
412 if ((delta > 0) &&
413 pskb_expand_head(skb, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) {
414 kfree_skb(skb);
415 return 0;
416 }
417
418 skb_reset_network_header(skb);
419 skb->dev = dev;
420 skb->protocol = htons(ETH_P_TIPC);
421 dev_hard_header(skb, dev, ETH_P_TIPC, dest->value,
422 dev->dev_addr, skb->len);
423 dev_queue_xmit(skb);
424 return 0;
425}
426
427int tipc_bearer_mtu(struct net *net, u32 bearer_id)
428{
429 int mtu = 0;
430 struct tipc_bearer *b;
431
432 rcu_read_lock();
433 b = rcu_dereference_rtnl(tipc_net(net)->bearer_list[bearer_id]);
434 if (b)
435 mtu = b->mtu;
436 rcu_read_unlock();
437 return mtu;
438}
439
440
441
442void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
443 struct sk_buff *skb,
444 struct tipc_media_addr *dest)
445{
446 struct tipc_net *tn = tipc_net(net);
447 struct tipc_bearer *b;
448
449 rcu_read_lock();
450 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
451 if (likely(b))
452 b->media->send_msg(net, skb, b, dest);
453 rcu_read_unlock();
454}
455
456
457
458void tipc_bearer_xmit(struct net *net, u32 bearer_id,
459 struct sk_buff_head *xmitq,
460 struct tipc_media_addr *dst)
461{
462 struct tipc_net *tn = net_generic(net, tipc_net_id);
463 struct tipc_bearer *b;
464 struct sk_buff *skb, *tmp;
465
466 if (skb_queue_empty(xmitq))
467 return;
468
469 rcu_read_lock();
470 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
471 if (likely(b)) {
472 skb_queue_walk_safe(xmitq, skb, tmp) {
473 __skb_dequeue(xmitq);
474 b->media->send_msg(net, skb, b, dst);
475 }
476 }
477 rcu_read_unlock();
478}
479
480
481
482void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
483 struct sk_buff_head *xmitq)
484{
485 struct tipc_net *tn = tipc_net(net);
486 int net_id = tn->net_id;
487 struct tipc_bearer *b;
488 struct sk_buff *skb, *tmp;
489 struct tipc_msg *hdr;
490
491 rcu_read_lock();
492 b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
493 if (likely(b)) {
494 skb_queue_walk_safe(xmitq, skb, tmp) {
495 hdr = buf_msg(skb);
496 msg_set_non_seq(hdr, 1);
497 msg_set_mc_netid(hdr, net_id);
498 __skb_dequeue(xmitq);
499 b->media->send_msg(net, skb, b, &b->bcast_addr);
500 }
501 }
502 rcu_read_unlock();
503}
504
505
506
507
508
509
510
511
512
513
514
515
516static int tipc_l2_rcv_msg(struct sk_buff *buf, struct net_device *dev,
517 struct packet_type *pt, struct net_device *orig_dev)
518{
519 struct tipc_bearer *b;
520
521 rcu_read_lock();
522 b = rcu_dereference_rtnl(dev->tipc_ptr);
523 if (likely(b)) {
524 if (likely(buf->pkt_type <= PACKET_BROADCAST)) {
525 buf->next = NULL;
526 tipc_rcv(dev_net(dev), buf, b);
527 rcu_read_unlock();
528 return NET_RX_SUCCESS;
529 }
530 }
531 rcu_read_unlock();
532
533 kfree_skb(buf);
534 return NET_RX_DROP;
535}
536
537
538
539
540
541
542
543
544
545
546static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
547 void *ptr)
548{
549 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
550 struct net *net = dev_net(dev);
551 struct tipc_bearer *b;
552
553 b = rtnl_dereference(dev->tipc_ptr);
554 if (!b)
555 return NOTIFY_DONE;
556
557 b->mtu = dev->mtu;
558
559 switch (evt) {
560 case NETDEV_CHANGE:
561 if (netif_carrier_ok(dev))
562 break;
563 case NETDEV_GOING_DOWN:
564 case NETDEV_CHANGEMTU:
565 tipc_reset_bearer(net, b);
566 break;
567 case NETDEV_CHANGEADDR:
568 b->media->raw2addr(b, &b->addr,
569 (char *)dev->dev_addr);
570 tipc_reset_bearer(net, b);
571 break;
572 case NETDEV_UNREGISTER:
573 case NETDEV_CHANGENAME:
574 bearer_disable(dev_net(dev), b);
575 break;
576 }
577 return NOTIFY_OK;
578}
579
580static struct packet_type tipc_packet_type __read_mostly = {
581 .type = htons(ETH_P_TIPC),
582 .func = tipc_l2_rcv_msg,
583};
584
585static struct notifier_block notifier = {
586 .notifier_call = tipc_l2_device_event,
587 .priority = 0,
588};
589
590int tipc_bearer_setup(void)
591{
592 int err;
593
594 err = register_netdevice_notifier(¬ifier);
595 if (err)
596 return err;
597 dev_add_pack(&tipc_packet_type);
598 return 0;
599}
600
601void tipc_bearer_cleanup(void)
602{
603 unregister_netdevice_notifier(¬ifier);
604 dev_remove_pack(&tipc_packet_type);
605}
606
607void tipc_bearer_stop(struct net *net)
608{
609 struct tipc_net *tn = net_generic(net, tipc_net_id);
610 struct tipc_bearer *b;
611 u32 i;
612
613 for (i = 0; i < MAX_BEARERS; i++) {
614 b = rtnl_dereference(tn->bearer_list[i]);
615 if (b) {
616 bearer_disable(net, b);
617 tn->bearer_list[i] = NULL;
618 }
619 }
620}
621
622
623static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
624 struct tipc_bearer *bearer, int nlflags)
625{
626 void *hdr;
627 struct nlattr *attrs;
628 struct nlattr *prop;
629
630 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
631 nlflags, TIPC_NL_BEARER_GET);
632 if (!hdr)
633 return -EMSGSIZE;
634
635 attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER);
636 if (!attrs)
637 goto msg_full;
638
639 if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
640 goto attr_msg_full;
641
642 prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP);
643 if (!prop)
644 goto prop_msg_full;
645 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
646 goto prop_msg_full;
647 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
648 goto prop_msg_full;
649 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window))
650 goto prop_msg_full;
651
652 nla_nest_end(msg->skb, prop);
653 nla_nest_end(msg->skb, attrs);
654 genlmsg_end(msg->skb, hdr);
655
656 return 0;
657
658prop_msg_full:
659 nla_nest_cancel(msg->skb, prop);
660attr_msg_full:
661 nla_nest_cancel(msg->skb, attrs);
662msg_full:
663 genlmsg_cancel(msg->skb, hdr);
664
665 return -EMSGSIZE;
666}
667
668int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
669{
670 int err;
671 int i = cb->args[0];
672 struct tipc_bearer *bearer;
673 struct tipc_nl_msg msg;
674 struct net *net = sock_net(skb->sk);
675 struct tipc_net *tn = net_generic(net, tipc_net_id);
676
677 if (i == MAX_BEARERS)
678 return 0;
679
680 msg.skb = skb;
681 msg.portid = NETLINK_CB(cb->skb).portid;
682 msg.seq = cb->nlh->nlmsg_seq;
683
684 rtnl_lock();
685 for (i = 0; i < MAX_BEARERS; i++) {
686 bearer = rtnl_dereference(tn->bearer_list[i]);
687 if (!bearer)
688 continue;
689
690 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
691 if (err)
692 break;
693 }
694 rtnl_unlock();
695
696 cb->args[0] = i;
697 return skb->len;
698}
699
700int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
701{
702 int err;
703 char *name;
704 struct sk_buff *rep;
705 struct tipc_bearer *bearer;
706 struct tipc_nl_msg msg;
707 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
708 struct net *net = genl_info_net(info);
709
710 if (!info->attrs[TIPC_NLA_BEARER])
711 return -EINVAL;
712
713 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
714 info->attrs[TIPC_NLA_BEARER],
715 tipc_nl_bearer_policy);
716 if (err)
717 return err;
718
719 if (!attrs[TIPC_NLA_BEARER_NAME])
720 return -EINVAL;
721 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
722
723 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
724 if (!rep)
725 return -ENOMEM;
726
727 msg.skb = rep;
728 msg.portid = info->snd_portid;
729 msg.seq = info->snd_seq;
730
731 rtnl_lock();
732 bearer = tipc_bearer_find(net, name);
733 if (!bearer) {
734 err = -EINVAL;
735 goto err_out;
736 }
737
738 err = __tipc_nl_add_bearer(&msg, bearer, 0);
739 if (err)
740 goto err_out;
741 rtnl_unlock();
742
743 return genlmsg_reply(rep, info);
744err_out:
745 rtnl_unlock();
746 nlmsg_free(rep);
747
748 return err;
749}
750
751int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
752{
753 int err;
754 char *name;
755 struct tipc_bearer *bearer;
756 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
757 struct net *net = sock_net(skb->sk);
758
759 if (!info->attrs[TIPC_NLA_BEARER])
760 return -EINVAL;
761
762 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
763 info->attrs[TIPC_NLA_BEARER],
764 tipc_nl_bearer_policy);
765 if (err)
766 return err;
767
768 if (!attrs[TIPC_NLA_BEARER_NAME])
769 return -EINVAL;
770
771 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
772
773 rtnl_lock();
774 bearer = tipc_bearer_find(net, name);
775 if (!bearer) {
776 rtnl_unlock();
777 return -EINVAL;
778 }
779
780 bearer_disable(net, bearer);
781 rtnl_unlock();
782
783 return 0;
784}
785
786int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
787{
788 int err;
789 char *bearer;
790 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
791 struct net *net = sock_net(skb->sk);
792 struct tipc_net *tn = net_generic(net, tipc_net_id);
793 u32 domain;
794 u32 prio;
795
796 prio = TIPC_MEDIA_LINK_PRI;
797 domain = tn->own_addr & TIPC_CLUSTER_MASK;
798
799 if (!info->attrs[TIPC_NLA_BEARER])
800 return -EINVAL;
801
802 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
803 info->attrs[TIPC_NLA_BEARER],
804 tipc_nl_bearer_policy);
805 if (err)
806 return err;
807
808 if (!attrs[TIPC_NLA_BEARER_NAME])
809 return -EINVAL;
810
811 bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
812
813 if (attrs[TIPC_NLA_BEARER_DOMAIN])
814 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
815
816 if (attrs[TIPC_NLA_BEARER_PROP]) {
817 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
818
819 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
820 props);
821 if (err)
822 return err;
823
824 if (props[TIPC_NLA_PROP_PRIO])
825 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
826 }
827
828 rtnl_lock();
829 err = tipc_enable_bearer(net, bearer, domain, prio, attrs);
830 if (err) {
831 rtnl_unlock();
832 return err;
833 }
834 rtnl_unlock();
835
836 return 0;
837}
838
839int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
840{
841 int err;
842 char *name;
843 struct tipc_bearer *b;
844 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
845 struct net *net = sock_net(skb->sk);
846
847 if (!info->attrs[TIPC_NLA_BEARER])
848 return -EINVAL;
849
850 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
851 info->attrs[TIPC_NLA_BEARER],
852 tipc_nl_bearer_policy);
853 if (err)
854 return err;
855
856 if (!attrs[TIPC_NLA_BEARER_NAME])
857 return -EINVAL;
858 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
859
860 rtnl_lock();
861 b = tipc_bearer_find(net, name);
862 if (!b) {
863 rtnl_unlock();
864 return -EINVAL;
865 }
866
867 if (attrs[TIPC_NLA_BEARER_PROP]) {
868 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
869
870 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
871 props);
872 if (err) {
873 rtnl_unlock();
874 return err;
875 }
876
877 if (props[TIPC_NLA_PROP_TOL])
878 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
879 if (props[TIPC_NLA_PROP_PRIO])
880 b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
881 if (props[TIPC_NLA_PROP_WIN])
882 b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
883 }
884 rtnl_unlock();
885
886 return 0;
887}
888
889static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
890 struct tipc_media *media, int nlflags)
891{
892 void *hdr;
893 struct nlattr *attrs;
894 struct nlattr *prop;
895
896 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
897 nlflags, TIPC_NL_MEDIA_GET);
898 if (!hdr)
899 return -EMSGSIZE;
900
901 attrs = nla_nest_start(msg->skb, TIPC_NLA_MEDIA);
902 if (!attrs)
903 goto msg_full;
904
905 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
906 goto attr_msg_full;
907
908 prop = nla_nest_start(msg->skb, TIPC_NLA_MEDIA_PROP);
909 if (!prop)
910 goto prop_msg_full;
911 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
912 goto prop_msg_full;
913 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
914 goto prop_msg_full;
915 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window))
916 goto prop_msg_full;
917
918 nla_nest_end(msg->skb, prop);
919 nla_nest_end(msg->skb, attrs);
920 genlmsg_end(msg->skb, hdr);
921
922 return 0;
923
924prop_msg_full:
925 nla_nest_cancel(msg->skb, prop);
926attr_msg_full:
927 nla_nest_cancel(msg->skb, attrs);
928msg_full:
929 genlmsg_cancel(msg->skb, hdr);
930
931 return -EMSGSIZE;
932}
933
934int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
935{
936 int err;
937 int i = cb->args[0];
938 struct tipc_nl_msg msg;
939
940 if (i == MAX_MEDIA)
941 return 0;
942
943 msg.skb = skb;
944 msg.portid = NETLINK_CB(cb->skb).portid;
945 msg.seq = cb->nlh->nlmsg_seq;
946
947 rtnl_lock();
948 for (; media_info_array[i] != NULL; i++) {
949 err = __tipc_nl_add_media(&msg, media_info_array[i],
950 NLM_F_MULTI);
951 if (err)
952 break;
953 }
954 rtnl_unlock();
955
956 cb->args[0] = i;
957 return skb->len;
958}
959
960int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
961{
962 int err;
963 char *name;
964 struct tipc_nl_msg msg;
965 struct tipc_media *media;
966 struct sk_buff *rep;
967 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
968
969 if (!info->attrs[TIPC_NLA_MEDIA])
970 return -EINVAL;
971
972 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
973 info->attrs[TIPC_NLA_MEDIA],
974 tipc_nl_media_policy);
975 if (err)
976 return err;
977
978 if (!attrs[TIPC_NLA_MEDIA_NAME])
979 return -EINVAL;
980 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
981
982 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
983 if (!rep)
984 return -ENOMEM;
985
986 msg.skb = rep;
987 msg.portid = info->snd_portid;
988 msg.seq = info->snd_seq;
989
990 rtnl_lock();
991 media = tipc_media_find(name);
992 if (!media) {
993 err = -EINVAL;
994 goto err_out;
995 }
996
997 err = __tipc_nl_add_media(&msg, media, 0);
998 if (err)
999 goto err_out;
1000 rtnl_unlock();
1001
1002 return genlmsg_reply(rep, info);
1003err_out:
1004 rtnl_unlock();
1005 nlmsg_free(rep);
1006
1007 return err;
1008}
1009
1010int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1011{
1012 int err;
1013 char *name;
1014 struct tipc_media *m;
1015 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1016
1017 if (!info->attrs[TIPC_NLA_MEDIA])
1018 return -EINVAL;
1019
1020 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
1021 info->attrs[TIPC_NLA_MEDIA],
1022 tipc_nl_media_policy);
1023
1024 if (!attrs[TIPC_NLA_MEDIA_NAME])
1025 return -EINVAL;
1026 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1027
1028 rtnl_lock();
1029 m = tipc_media_find(name);
1030 if (!m) {
1031 rtnl_unlock();
1032 return -EINVAL;
1033 }
1034
1035 if (attrs[TIPC_NLA_MEDIA_PROP]) {
1036 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1037
1038 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
1039 props);
1040 if (err) {
1041 rtnl_unlock();
1042 return err;
1043 }
1044
1045 if (props[TIPC_NLA_PROP_TOL])
1046 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1047 if (props[TIPC_NLA_PROP_PRIO])
1048 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1049 if (props[TIPC_NLA_PROP_WIN])
1050 m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1051 }
1052 rtnl_unlock();
1053
1054 return 0;
1055}
1056
