2 * net/tipc/bearer.c: TIPC bearer code
4 * Copyright (c) 1996-2006, 2013, Ericsson AB
5 * Copyright (c) 2004-2006, 2010-2013, Wind River Systems
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42 #define MAX_ADDR_STR 60
44 static struct tipc_media * const media_info_array[] = {
46 #ifdef CONFIG_TIPC_MEDIA_IB
52 struct tipc_bearer tipc_bearers[MAX_BEARERS];
54 static void bearer_disable(struct tipc_bearer *b_ptr, bool shutting_down);
57 * tipc_media_find - locates specified media object by name
59 struct tipc_media *tipc_media_find(const char *name)
63 for (i = 0; media_info_array[i] != NULL; i++) {
64 if (!strcmp(media_info_array[i]->name, name))
67 return media_info_array[i];
71 * media_find_id - locates specified media object by type identifier
73 static struct tipc_media *media_find_id(u8 type)
77 for (i = 0; media_info_array[i] != NULL; i++) {
78 if (media_info_array[i]->type_id == type)
81 return media_info_array[i];
85 * tipc_media_addr_printf - record media address in print buffer
87 void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a)
89 char addr_str[MAX_ADDR_STR];
90 struct tipc_media *m_ptr;
93 m_ptr = media_find_id(a->media_id);
95 if (m_ptr && !m_ptr->addr2str(a, addr_str, sizeof(addr_str)))
96 ret = tipc_snprintf(buf, len, "%s(%s)", m_ptr->name, addr_str);
100 ret = tipc_snprintf(buf, len, "UNKNOWN(%u)", a->media_id);
101 for (i = 0; i < sizeof(a->value); i++)
102 ret += tipc_snprintf(buf - ret, len + ret,
103 "-%02x", a->value[i]);
108 * tipc_media_get_names - record names of registered media in buffer
110 struct sk_buff *tipc_media_get_names(void)
115 buf = tipc_cfg_reply_alloc(MAX_MEDIA * TLV_SPACE(TIPC_MAX_MEDIA_NAME));
119 for (i = 0; media_info_array[i] != NULL; i++) {
120 tipc_cfg_append_tlv(buf, TIPC_TLV_MEDIA_NAME,
121 media_info_array[i]->name,
122 strlen(media_info_array[i]->name) + 1);
128 * bearer_name_validate - validate & (optionally) deconstruct bearer name
129 * @name: ptr to bearer name string
130 * @name_parts: ptr to area for bearer name components (or NULL if not needed)
132 * Returns 1 if bearer name is valid, otherwise 0.
134 static int bearer_name_validate(const char *name,
135 struct tipc_bearer_names *name_parts)
137 char name_copy[TIPC_MAX_BEARER_NAME];
143 /* copy bearer name & ensure length is OK */
144 name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
145 /* need above in case non-Posix strncpy() doesn't pad with nulls */
146 strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
147 if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
150 /* ensure all component parts of bearer name are present */
151 media_name = name_copy;
152 if_name = strchr(media_name, ':');
156 media_len = if_name - media_name;
157 if_len = strlen(if_name) + 1;
159 /* validate component parts of bearer name */
160 if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
161 (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME))
164 /* return bearer name components, if necessary */
166 strcpy(name_parts->media_name, media_name);
167 strcpy(name_parts->if_name, if_name);
173 * tipc_bearer_find - locates bearer object with matching bearer name
175 struct tipc_bearer *tipc_bearer_find(const char *name)
177 struct tipc_bearer *b_ptr;
180 for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) {
181 if (b_ptr->active && (!strcmp(b_ptr->name, name)))
188 * tipc_bearer_get_names - record names of bearers in buffer
190 struct sk_buff *tipc_bearer_get_names(void)
193 struct tipc_bearer *b;
196 buf = tipc_cfg_reply_alloc(MAX_BEARERS * TLV_SPACE(TIPC_MAX_BEARER_NAME));
200 read_lock_bh(&tipc_net_lock);
201 for (i = 0; media_info_array[i] != NULL; i++) {
202 for (j = 0; j < MAX_BEARERS; j++) {
203 b = &tipc_bearers[j];
204 if (b->active && (b->media == media_info_array[i])) {
205 tipc_cfg_append_tlv(buf, TIPC_TLV_BEARER_NAME,
207 strlen(b->name) + 1);
211 read_unlock_bh(&tipc_net_lock);
215 void tipc_bearer_add_dest(struct tipc_bearer *b_ptr, u32 dest)
217 tipc_nmap_add(&b_ptr->nodes, dest);
218 tipc_bcbearer_sort();
219 tipc_disc_add_dest(b_ptr->link_req);
222 void tipc_bearer_remove_dest(struct tipc_bearer *b_ptr, u32 dest)
224 tipc_nmap_remove(&b_ptr->nodes, dest);
225 tipc_bcbearer_sort();
226 tipc_disc_remove_dest(b_ptr->link_req);
230 * tipc_enable_bearer - enable bearer with the given name
232 int tipc_enable_bearer(const char *name, u32 disc_domain, u32 priority)
234 struct tipc_bearer *b_ptr;
235 struct tipc_media *m_ptr;
236 struct tipc_bearer_names b_names;
237 char addr_string[16];
243 if (!tipc_own_addr) {
244 pr_warn("Bearer <%s> rejected, not supported in standalone mode\n",
248 if (!bearer_name_validate(name, &b_names)) {
249 pr_warn("Bearer <%s> rejected, illegal name\n", name);
252 if (tipc_addr_domain_valid(disc_domain) &&
253 (disc_domain != tipc_own_addr)) {
254 if (tipc_in_scope(disc_domain, tipc_own_addr)) {
255 disc_domain = tipc_own_addr & TIPC_CLUSTER_MASK;
256 res = 0; /* accept any node in own cluster */
257 } else if (in_own_cluster_exact(disc_domain))
258 res = 0; /* accept specified node in own cluster */
261 pr_warn("Bearer <%s> rejected, illegal discovery domain\n",
265 if ((priority > TIPC_MAX_LINK_PRI) &&
266 (priority != TIPC_MEDIA_LINK_PRI)) {
267 pr_warn("Bearer <%s> rejected, illegal priority\n", name);
271 write_lock_bh(&tipc_net_lock);
273 m_ptr = tipc_media_find(b_names.media_name);
275 pr_warn("Bearer <%s> rejected, media <%s> not registered\n",
276 name, b_names.media_name);
280 if (priority == TIPC_MEDIA_LINK_PRI)
281 priority = m_ptr->priority;
284 bearer_id = MAX_BEARERS;
286 for (i = MAX_BEARERS; i-- != 0; ) {
287 if (!tipc_bearers[i].active) {
291 if (!strcmp(name, tipc_bearers[i].name)) {
292 pr_warn("Bearer <%s> rejected, already enabled\n",
296 if ((tipc_bearers[i].priority == priority) &&
297 (++with_this_prio > 2)) {
298 if (priority-- == 0) {
299 pr_warn("Bearer <%s> rejected, duplicate priority\n",
303 pr_warn("Bearer <%s> priority adjustment required %u->%u\n",
304 name, priority + 1, priority);
308 if (bearer_id >= MAX_BEARERS) {
309 pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
314 b_ptr = &tipc_bearers[bearer_id];
315 strcpy(b_ptr->name, name);
316 b_ptr->media = m_ptr;
317 res = m_ptr->enable_media(b_ptr);
319 pr_warn("Bearer <%s> rejected, enable failure (%d)\n",
324 b_ptr->identity = bearer_id;
325 b_ptr->tolerance = m_ptr->tolerance;
326 b_ptr->window = m_ptr->window;
327 b_ptr->net_plane = bearer_id + 'A';
329 b_ptr->priority = priority;
331 res = tipc_disc_create(b_ptr, &b_ptr->bcast_addr, disc_domain);
333 bearer_disable(b_ptr, false);
334 pr_warn("Bearer <%s> rejected, discovery object creation failed\n",
338 pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
340 tipc_addr_string_fill(addr_string, disc_domain), priority);
342 write_unlock_bh(&tipc_net_lock);
347 * tipc_reset_bearer - Reset all links established over this bearer
349 static int tipc_reset_bearer(struct tipc_bearer *b_ptr)
351 read_lock_bh(&tipc_net_lock);
352 pr_info("Resetting bearer <%s>\n", b_ptr->name);
353 tipc_link_reset_list(b_ptr->identity);
354 read_unlock_bh(&tipc_net_lock);
361 * Note: This routine assumes caller holds tipc_net_lock.
363 static void bearer_disable(struct tipc_bearer *b_ptr, bool shutting_down)
365 pr_info("Disabling bearer <%s>\n", b_ptr->name);
366 b_ptr->media->disable_media(b_ptr);
368 tipc_link_delete_list(b_ptr->identity, shutting_down);
370 tipc_disc_delete(b_ptr->link_req);
371 memset(b_ptr, 0, sizeof(struct tipc_bearer));
374 int tipc_disable_bearer(const char *name)
376 struct tipc_bearer *b_ptr;
379 write_lock_bh(&tipc_net_lock);
380 b_ptr = tipc_bearer_find(name);
382 pr_warn("Attempt to disable unknown bearer <%s>\n", name);
385 bearer_disable(b_ptr, false);
388 write_unlock_bh(&tipc_net_lock);
393 /* tipc_l2_media_addr_set - initialize Ethernet media address structure
395 * Media-dependent "value" field stores MAC address in first 6 bytes
396 * and zeroes out the remaining bytes.
398 void tipc_l2_media_addr_set(const struct tipc_bearer *b,
399 struct tipc_media_addr *a, char *mac)
401 int len = b->media->hwaddr_len;
403 if (unlikely(sizeof(a->value) < len)) {
404 WARN_ONCE(1, "Media length invalid\n");
408 memcpy(a->value, mac, len);
409 memset(a->value + len, 0, sizeof(a->value) - len);
410 a->media_id = b->media->type_id;
411 a->broadcast = !memcmp(mac, b->bcast_addr.value, len);
414 int tipc_enable_l2_media(struct tipc_bearer *b)
416 struct net_device *dev;
417 char *driver_name = strchr((const char *)b->name, ':') + 1;
419 /* Find device with specified name */
420 dev = dev_get_by_name(&init_net, driver_name);
424 /* Associate TIPC bearer with Ethernet bearer */
426 memset(b->bcast_addr.value, 0, sizeof(b->bcast_addr.value));
427 memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len);
428 b->bcast_addr.media_id = b->media->type_id;
429 b->bcast_addr.broadcast = 1;
431 tipc_l2_media_addr_set(b, &b->addr, (char *)dev->dev_addr);
432 rcu_assign_pointer(dev->tipc_ptr, b);
436 /* tipc_disable_l2_media - detach TIPC bearer from an Ethernet interface
438 * Mark Ethernet bearer as inactive so that incoming buffers are thrown away,
439 * then get worker thread to complete bearer cleanup. (Can't do cleanup
440 * here because cleanup code needs to sleep and caller holds spinlocks.)
442 void tipc_disable_l2_media(struct tipc_bearer *b)
444 struct net_device *dev = (struct net_device *)b->media_ptr;
445 RCU_INIT_POINTER(dev->tipc_ptr, NULL);
450 * tipc_l2_send_msg - send a TIPC packet out over an Ethernet interface
451 * @buf: the packet to be sent
452 * @b_ptr: the bearer through which the packet is to be sent
453 * @dest: peer destination address
455 int tipc_l2_send_msg(struct sk_buff *buf, struct tipc_bearer *b,
456 struct tipc_media_addr *dest)
458 struct sk_buff *clone;
460 struct net_device *dev = (struct net_device *)b->media_ptr;
462 clone = skb_clone(buf, GFP_ATOMIC);
466 delta = dev->hard_header_len - skb_headroom(buf);
468 pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) {
473 skb_reset_network_header(clone);
475 clone->protocol = htons(ETH_P_TIPC);
476 dev_hard_header(clone, dev, ETH_P_TIPC, dest->value,
477 dev->dev_addr, clone->len);
478 dev_queue_xmit(clone);
482 /* tipc_bearer_send- sends buffer to destination over bearer
485 * The media send routine must not alter the buffer being passed in
486 * as it may be needed for later retransmission!
488 void tipc_bearer_send(struct tipc_bearer *b, struct sk_buff *buf,
489 struct tipc_media_addr *dest)
491 b->media->send_msg(buf, b, dest);
495 * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
496 * @buf: the received packet
497 * @dev: the net device that the packet was received on
498 * @pt: the packet_type structure which was used to register this handler
499 * @orig_dev: the original receive net device in case the device is a bond
501 * Accept only packets explicitly sent to this node, or broadcast packets;
502 * ignores packets sent using interface multicast, and traffic sent to other
503 * nodes (which can happen if interface is running in promiscuous mode).
505 static int tipc_l2_rcv_msg(struct sk_buff *buf, struct net_device *dev,
506 struct packet_type *pt, struct net_device *orig_dev)
508 struct tipc_bearer *b_ptr;
510 if (!net_eq(dev_net(dev), &init_net)) {
516 b_ptr = rcu_dereference(dev->tipc_ptr);
518 if (likely(buf->pkt_type <= PACKET_BROADCAST)) {
520 tipc_rcv(buf, b_ptr);
522 return NET_RX_SUCCESS;
532 * tipc_l2_device_event - handle device events from network device
533 * @nb: the context of the notification
534 * @evt: the type of event
535 * @ptr: the net device that the event was on
537 * This function is called by the Ethernet driver in case of link
540 static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
543 struct tipc_bearer *b_ptr;
544 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
546 if (!net_eq(dev_net(dev), &init_net))
550 b_ptr = rcu_dereference(dev->tipc_ptr);
556 b_ptr->mtu = dev->mtu;
560 if (netif_carrier_ok(dev))
563 case NETDEV_CHANGEMTU:
564 case NETDEV_CHANGEADDR:
565 tipc_reset_bearer(b_ptr);
567 case NETDEV_UNREGISTER:
568 case NETDEV_CHANGENAME:
569 tipc_disable_bearer(b_ptr->name);
577 static struct packet_type tipc_packet_type __read_mostly = {
578 .type = htons(ETH_P_TIPC),
579 .func = tipc_l2_rcv_msg,
582 static struct notifier_block notifier = {
583 .notifier_call = tipc_l2_device_event,
587 int tipc_bearer_setup(void)
591 err = register_netdevice_notifier(¬ifier);
594 dev_add_pack(&tipc_packet_type);
598 void tipc_bearer_cleanup(void)
600 unregister_netdevice_notifier(¬ifier);
601 dev_remove_pack(&tipc_packet_type);
604 void tipc_bearer_stop(void)
608 for (i = 0; i < MAX_BEARERS; i++) {
609 if (tipc_bearers[i].active)
610 bearer_disable(&tipc_bearers[i], true);