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
41 #define ETH_LINK_PRIORITY TIPC_DEF_LINK_PRI
42 #define ETH_LINK_TOLERANCE TIPC_DEF_LINK_TOL
43 #define ETH_LINK_WINDOW TIPC_DEF_LINK_WIN
46 * struct eth_bearer - Ethernet bearer data structure
47 * @bearer: ptr to associated "generic" bearer structure
48 * @dev: ptr to associated Ethernet network device
49 * @tipc_packet_type: used in binding TIPC to Ethernet driver
53 struct tipc_bearer *bearer;
54 struct net_device *dev;
55 struct packet_type tipc_packet_type;
56 struct work_struct setup;
59 static struct eth_bearer eth_bearers[MAX_ETH_BEARERS];
60 static int eth_started;
61 static struct notifier_block notifier;
64 * send_msg - send a TIPC message out over an Ethernet interface
67 static int send_msg(struct sk_buff *buf, struct tipc_bearer *tb_ptr,
68 struct tipc_media_addr *dest)
70 struct sk_buff *clone;
71 struct net_device *dev;
74 clone = skb_clone(buf, GFP_ATOMIC);
78 dev = ((struct eth_bearer *)(tb_ptr->usr_handle))->dev;
79 delta = dev->hard_header_len - skb_headroom(buf);
82 pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) {
87 skb_reset_network_header(clone);
89 dev_hard_header(clone, dev, ETH_P_TIPC, &dest->dev_addr.eth_addr,
90 dev->dev_addr, clone->len);
91 dev_queue_xmit(clone);
96 * recv_msg - handle incoming TIPC message from an Ethernet interface
98 * Accept only packets explicitly sent to this node, or broadcast packets;
99 * ignores packets sent using Ethernet multicast, and traffic sent to other
100 * nodes (which can happen if interface is running in promiscuous mode).
103 static int recv_msg(struct sk_buff *buf, struct net_device *dev,
104 struct packet_type *pt, struct net_device *orig_dev)
106 struct eth_bearer *eb_ptr = (struct eth_bearer *)pt->af_packet_priv;
108 if (!net_eq(dev_net(dev), &init_net)) {
113 if (likely(eb_ptr->bearer)) {
114 if (likely(buf->pkt_type <= PACKET_BROADCAST)) {
116 tipc_recv_msg(buf, eb_ptr->bearer);
125 * setup_bearer - setup association between Ethernet bearer and interface
127 static void setup_bearer(struct work_struct *work)
129 struct eth_bearer *eb_ptr =
130 container_of(work, struct eth_bearer, setup);
132 dev_add_pack(&eb_ptr->tipc_packet_type);
136 * enable_bearer - attach TIPC bearer to an Ethernet interface
139 static int enable_bearer(struct tipc_bearer *tb_ptr)
141 struct net_device *dev = NULL;
142 struct net_device *pdev = NULL;
143 struct eth_bearer *eb_ptr = ð_bearers[0];
144 struct eth_bearer *stop = ð_bearers[MAX_ETH_BEARERS];
145 char *driver_name = strchr((const char *)tb_ptr->name, ':') + 1;
148 /* Find unused Ethernet bearer structure */
150 while (eb_ptr->dev) {
153 if (++eb_ptr == stop)
154 return pending_dev ? -EAGAIN : -EDQUOT;
157 /* Find device with specified name */
159 read_lock(&dev_base_lock);
160 for_each_netdev(&init_net, pdev) {
161 if (!strncmp(pdev->name, driver_name, IFNAMSIZ)) {
167 read_unlock(&dev_base_lock);
170 if (tipc_mtu_bad(dev, 0)) {
175 /* Create Ethernet bearer for device */
178 eb_ptr->tipc_packet_type.type = htons(ETH_P_TIPC);
179 eb_ptr->tipc_packet_type.dev = dev;
180 eb_ptr->tipc_packet_type.func = recv_msg;
181 eb_ptr->tipc_packet_type.af_packet_priv = eb_ptr;
182 INIT_LIST_HEAD(&(eb_ptr->tipc_packet_type.list));
183 INIT_WORK(&eb_ptr->setup, setup_bearer);
184 schedule_work(&eb_ptr->setup);
186 /* Associate TIPC bearer with Ethernet bearer */
188 eb_ptr->bearer = tb_ptr;
189 tb_ptr->usr_handle = (void *)eb_ptr;
190 tb_ptr->mtu = dev->mtu;
192 tb_ptr->addr.type = htonl(TIPC_MEDIA_TYPE_ETH);
193 memcpy(&tb_ptr->addr.dev_addr, dev->dev_addr, ETH_ALEN);
198 * disable_bearer - detach TIPC bearer from an Ethernet interface
200 * We really should do dev_remove_pack() here, but this function can not be
201 * called at tasklet level. => Use eth_bearer->bearer as a flag to throw away
202 * incoming buffers, & postpone dev_remove_pack() to eth_media_stop() on exit.
205 static void disable_bearer(struct tipc_bearer *tb_ptr)
207 ((struct eth_bearer *)tb_ptr->usr_handle)->bearer = NULL;
211 * recv_notification - handle device updates from OS
213 * Change the state of the Ethernet bearer (if any) associated with the
217 static int recv_notification(struct notifier_block *nb, unsigned long evt,
220 struct net_device *dev = (struct net_device *)dv;
221 struct eth_bearer *eb_ptr = ð_bearers[0];
222 struct eth_bearer *stop = ð_bearers[MAX_ETH_BEARERS];
224 if (!net_eq(dev_net(dev), &init_net))
227 while ((eb_ptr->dev != dev)) {
228 if (++eb_ptr == stop)
229 return NOTIFY_DONE; /* couldn't find device */
232 return NOTIFY_DONE; /* bearer had been disabled */
236 if (netif_carrier_ok(dev))
237 tipc_continue(eb_ptr->bearer);
239 tipc_block_bearer(eb_ptr->bearer->name);
242 tipc_continue(eb_ptr->bearer);
245 tipc_block_bearer(eb_ptr->bearer->name);
247 case NETDEV_CHANGEMTU:
248 if (tipc_mtu_bad(dev, 0)) {
249 tipc_disable_bearer(eb_ptr->bearer->name);
252 eb_ptr->bearer->mtu = dev->mtu;
254 case NETDEV_CHANGEADDR:
255 tipc_block_bearer(eb_ptr->bearer->name);
256 tipc_continue(eb_ptr->bearer);
258 case NETDEV_UNREGISTER:
259 case NETDEV_CHANGENAME:
260 tipc_disable_bearer(eb_ptr->bearer->name);
267 * eth_addr2str - convert Ethernet address to string
270 static char *eth_addr2str(struct tipc_media_addr *a, char *str_buf, int str_size)
272 unchar *addr = (unchar *)&a->dev_addr;
277 sprintf(str_buf, "%pM", addr);
282 * tipc_eth_media_start - activate Ethernet bearer support
284 * Register Ethernet media type with TIPC bearer code. Also register
285 * with OS for notifications about device state changes.
288 int tipc_eth_media_start(void)
290 struct tipc_media_addr bcast_addr;
296 bcast_addr.type = htonl(TIPC_MEDIA_TYPE_ETH);
297 memset(&bcast_addr.dev_addr, 0xff, ETH_ALEN);
299 memset(eth_bearers, 0, sizeof(eth_bearers));
301 res = tipc_register_media(TIPC_MEDIA_TYPE_ETH, "eth",
302 enable_bearer, disable_bearer, send_msg,
303 eth_addr2str, &bcast_addr, ETH_LINK_PRIORITY,
304 ETH_LINK_TOLERANCE, ETH_LINK_WINDOW);
308 notifier.notifier_call = &recv_notification;
309 notifier.priority = 0;
310 res = register_netdevice_notifier(¬ifier);
317 * tipc_eth_media_stop - deactivate Ethernet bearer support
320 void tipc_eth_media_stop(void)
327 unregister_netdevice_notifier(¬ifier);
328 for (i = 0; i < MAX_ETH_BEARERS ; i++) {
329 if (eth_bearers[i].bearer) {
330 eth_bearers[i].bearer->blocked = 1;
331 eth_bearers[i].bearer = NULL;
333 if (eth_bearers[i].dev) {
334 dev_remove_pack(ð_bearers[i].tipc_packet_type);
335 dev_put(eth_bearers[i].dev);
338 memset(ð_bearers, 0, sizeof(eth_bearers));