2 * net/tipc/eth_media.c: Ethernet bearer support for TIPC
4 * Copyright (c) 2001-2007, Ericsson AB
5 * Copyright (c) 2005-2008, 2011, Wind River Systems
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21 * GNU General Public License ("GPL") version 2 as published by the Free
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40 #define MAX_ETH_BEARERS MAX_BEARERS
42 #define ETH_ADDR_OFFSET 4 /* message header offset of MAC address */
45 * struct eth_bearer - Ethernet bearer data structure
46 * @bearer: ptr to associated "generic" bearer structure
47 * @dev: ptr to associated Ethernet network device
48 * @tipc_packet_type: used in binding TIPC to Ethernet driver
52 struct tipc_bearer *bearer;
53 struct net_device *dev;
54 struct packet_type tipc_packet_type;
57 static struct eth_bearer eth_bearers[MAX_ETH_BEARERS];
58 static int eth_started;
59 static struct notifier_block notifier;
62 * eth_media_addr_set - initialize Ethernet media address structure
65 static void eth_media_addr_set(struct tipc_media_addr *a, char *mac)
67 a->type = htonl(TIPC_MEDIA_TYPE_ETH);
68 memcpy(&a->dev_addr.eth_addr, mac, ETH_ALEN);
72 * send_msg - send a TIPC message out over an Ethernet interface
75 static int send_msg(struct sk_buff *buf, struct tipc_bearer *tb_ptr,
76 struct tipc_media_addr *dest)
78 struct sk_buff *clone;
79 struct net_device *dev;
82 clone = skb_clone(buf, GFP_ATOMIC);
86 dev = ((struct eth_bearer *)(tb_ptr->usr_handle))->dev;
87 delta = dev->hard_header_len - skb_headroom(buf);
90 pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) {
95 skb_reset_network_header(clone);
97 dev_hard_header(clone, dev, ETH_P_TIPC, &dest->dev_addr.eth_addr,
98 dev->dev_addr, clone->len);
99 dev_queue_xmit(clone);
104 * recv_msg - handle incoming TIPC message from an Ethernet interface
106 * Accept only packets explicitly sent to this node, or broadcast packets;
107 * ignores packets sent using Ethernet multicast, and traffic sent to other
108 * nodes (which can happen if interface is running in promiscuous mode).
111 static int recv_msg(struct sk_buff *buf, struct net_device *dev,
112 struct packet_type *pt, struct net_device *orig_dev)
114 struct eth_bearer *eb_ptr = (struct eth_bearer *)pt->af_packet_priv;
116 if (!net_eq(dev_net(dev), &init_net)) {
121 if (likely(eb_ptr->bearer)) {
122 if (likely(buf->pkt_type <= PACKET_BROADCAST)) {
124 tipc_recv_msg(buf, eb_ptr->bearer);
133 * enable_bearer - attach TIPC bearer to an Ethernet interface
136 static int enable_bearer(struct tipc_bearer *tb_ptr)
138 struct net_device *dev = NULL;
139 struct net_device *pdev = NULL;
140 struct eth_bearer *eb_ptr = ð_bearers[0];
141 struct eth_bearer *stop = ð_bearers[MAX_ETH_BEARERS];
142 char *driver_name = strchr((const char *)tb_ptr->name, ':') + 1;
145 /* Find unused Ethernet bearer structure */
147 while (eb_ptr->dev) {
150 if (++eb_ptr == stop)
151 return pending_dev ? -EAGAIN : -EDQUOT;
154 /* Find device with specified name */
156 read_lock(&dev_base_lock);
157 for_each_netdev(&init_net, pdev) {
158 if (!strncmp(pdev->name, driver_name, IFNAMSIZ)) {
164 read_unlock(&dev_base_lock);
168 /* Create Ethernet bearer for device */
171 eb_ptr->tipc_packet_type.type = htons(ETH_P_TIPC);
172 eb_ptr->tipc_packet_type.dev = dev;
173 eb_ptr->tipc_packet_type.func = recv_msg;
174 eb_ptr->tipc_packet_type.af_packet_priv = eb_ptr;
175 INIT_LIST_HEAD(&(eb_ptr->tipc_packet_type.list));
176 dev_add_pack(&eb_ptr->tipc_packet_type);
178 /* Associate TIPC bearer with Ethernet bearer */
180 eb_ptr->bearer = tb_ptr;
181 tb_ptr->usr_handle = (void *)eb_ptr;
182 tb_ptr->mtu = dev->mtu;
184 eth_media_addr_set(&tb_ptr->addr, (char *)dev->dev_addr);
189 * disable_bearer - detach TIPC bearer from an Ethernet interface
191 * We really should do dev_remove_pack() here, but this function can not be
192 * called at tasklet level. => Use eth_bearer->bearer as a flag to throw away
193 * incoming buffers, & postpone dev_remove_pack() to eth_media_stop() on exit.
196 static void disable_bearer(struct tipc_bearer *tb_ptr)
198 ((struct eth_bearer *)tb_ptr->usr_handle)->bearer = NULL;
202 * recv_notification - handle device updates from OS
204 * Change the state of the Ethernet bearer (if any) associated with the
208 static int recv_notification(struct notifier_block *nb, unsigned long evt,
211 struct net_device *dev = (struct net_device *)dv;
212 struct eth_bearer *eb_ptr = ð_bearers[0];
213 struct eth_bearer *stop = ð_bearers[MAX_ETH_BEARERS];
215 if (!net_eq(dev_net(dev), &init_net))
218 while ((eb_ptr->dev != dev)) {
219 if (++eb_ptr == stop)
220 return NOTIFY_DONE; /* couldn't find device */
223 return NOTIFY_DONE; /* bearer had been disabled */
225 eb_ptr->bearer->mtu = dev->mtu;
229 if (netif_carrier_ok(dev))
230 tipc_continue(eb_ptr->bearer);
232 tipc_block_bearer(eb_ptr->bearer->name);
235 tipc_continue(eb_ptr->bearer);
238 tipc_block_bearer(eb_ptr->bearer->name);
240 case NETDEV_CHANGEMTU:
241 case NETDEV_CHANGEADDR:
242 tipc_block_bearer(eb_ptr->bearer->name);
243 tipc_continue(eb_ptr->bearer);
245 case NETDEV_UNREGISTER:
246 case NETDEV_CHANGENAME:
247 tipc_disable_bearer(eb_ptr->bearer->name);
254 * eth_addr2str - convert Ethernet address to string
257 static int eth_addr2str(struct tipc_media_addr *a, char *str_buf, int str_size)
259 unchar *addr = (unchar *)&a->dev_addr;
261 if (str_size < 18) /* 18 = strlen("aa:bb:cc:dd:ee:ff\0") */
264 sprintf(str_buf, "%pM", addr);
269 * eth_str2addr - convert string to Ethernet address
272 static int eth_str2addr(struct tipc_media_addr *a, char *str_buf)
277 r = sscanf(str_buf, "%02x:%02x:%02x:%02x:%02x:%02x",
278 (u32 *)&mac[0], (u32 *)&mac[1], (u32 *)&mac[2],
279 (u32 *)&mac[3], (u32 *)&mac[4], (u32 *)&mac[5]);
284 eth_media_addr_set(a, mac);
289 * eth_str2addr - convert Ethernet address format to message header format
292 static int eth_addr2msg(struct tipc_media_addr *a, char *msg_area)
294 memset(msg_area, 0, TIPC_MEDIA_ADDR_SIZE);
295 msg_area[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_ETH;
296 memcpy(msg_area + ETH_ADDR_OFFSET, a->dev_addr.eth_addr, ETH_ALEN);
301 * eth_str2addr - convert message header address format to Ethernet format
304 static int eth_msg2addr(struct tipc_media_addr *a, char *msg_area)
306 if (msg_area[TIPC_MEDIA_TYPE_OFFSET] != TIPC_MEDIA_TYPE_ETH)
309 eth_media_addr_set(a, msg_area + ETH_ADDR_OFFSET);
314 * Ethernet media registration info
317 static struct media eth_media_info = {
318 .send_msg = send_msg,
319 .enable_bearer = enable_bearer,
320 .disable_bearer = disable_bearer,
321 .addr2str = eth_addr2str,
322 .str2addr = eth_str2addr,
323 .addr2msg = eth_addr2msg,
324 .msg2addr = eth_msg2addr,
325 .bcast_addr = { htonl(TIPC_MEDIA_TYPE_ETH),
326 { {0xff, 0xff, 0xff, 0xff, 0xff, 0xff} } },
327 .priority = TIPC_DEF_LINK_PRI,
328 .tolerance = TIPC_DEF_LINK_TOL,
329 .window = TIPC_DEF_LINK_WIN,
330 .type_id = TIPC_MEDIA_TYPE_ETH,
335 * tipc_eth_media_start - activate Ethernet bearer support
337 * Register Ethernet media type with TIPC bearer code. Also register
338 * with OS for notifications about device state changes.
341 int tipc_eth_media_start(void)
348 memset(eth_bearers, 0, sizeof(eth_bearers));
350 res = tipc_register_media(ð_media_info);
354 notifier.notifier_call = &recv_notification;
355 notifier.priority = 0;
356 res = register_netdevice_notifier(¬ifier);
363 * tipc_eth_media_stop - deactivate Ethernet bearer support
366 void tipc_eth_media_stop(void)
373 unregister_netdevice_notifier(¬ifier);
374 for (i = 0; i < MAX_ETH_BEARERS ; i++) {
375 if (eth_bearers[i].bearer) {
376 eth_bearers[i].bearer->blocked = 1;
377 eth_bearers[i].bearer = NULL;
379 if (eth_bearers[i].dev) {
380 dev_remove_pack(ð_bearers[i].tipc_packet_type);
381 dev_put(eth_bearers[i].dev);
384 memset(ð_bearers, 0, sizeof(eth_bearers));