2 * net/tipc/eth_media.c: Ethernet bearer support for TIPC
4 * Copyright (c) 2001-2006, Ericsson AB
5 * Copyright (c) 2005, Wind River Systems
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9 * modification, are permitted provided that the following conditions are met:
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20 * Alternatively, this software may be distributed under the terms of the
21 * GNU General Public License ("GPL") version 2 as published by the Free
22 * Software Foundation.
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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37 #include <net/tipc/tipc.h>
38 #include <net/tipc/tipc_bearer.h>
39 #include <net/tipc/tipc_msg.h>
40 #include <linux/netdevice.h>
42 #define MAX_ETH_BEARERS 2
43 #define ETH_LINK_PRIORITY TIPC_DEF_LINK_PRI
44 #define ETH_LINK_TOLERANCE TIPC_DEF_LINK_TOL
45 #define ETH_LINK_WINDOW TIPC_DEF_LINK_WIN
48 * struct eth_bearer - Ethernet bearer data structure
49 * @bearer: ptr to associated "generic" bearer structure
50 * @dev: ptr to associated Ethernet network device
51 * @tipc_packet_type: used in binding TIPC to Ethernet driver
55 struct tipc_bearer *bearer;
56 struct net_device *dev;
57 struct packet_type tipc_packet_type;
60 static struct eth_bearer eth_bearers[MAX_ETH_BEARERS];
61 static int eth_started = 0;
62 static struct notifier_block notifier;
65 * send_msg - send a TIPC message out over an Ethernet interface
68 static int send_msg(struct sk_buff *buf, struct tipc_bearer *tb_ptr,
69 struct tipc_media_addr *dest)
71 struct sk_buff *clone;
72 struct net_device *dev;
74 clone = skb_clone(buf, GFP_ATOMIC);
76 clone->nh.raw = clone->data;
77 dev = ((struct eth_bearer *)(tb_ptr->usr_handle))->dev;
79 dev->hard_header(clone, dev, ETH_P_TIPC,
80 &dest->dev_addr.eth_addr,
81 dev->dev_addr, clone->len);
82 dev_queue_xmit(clone);
88 * recv_msg - handle incoming TIPC message from an Ethernet interface
90 * Routine truncates any Ethernet padding/CRC appended to the message,
91 * and ensures message size matches actual length
94 static int recv_msg(struct sk_buff *buf, struct net_device *dev,
95 struct packet_type *pt, struct net_device *orig_dev)
97 struct eth_bearer *eb_ptr = (struct eth_bearer *)pt->af_packet_priv;
100 if (likely(eb_ptr->bearer)) {
101 size = msg_size((struct tipc_msg *)buf->data);
103 if (likely(buf->len == size)) {
105 tipc_recv_msg(buf, eb_ptr->bearer);
116 * enable_bearer - attach TIPC bearer to an Ethernet interface
119 static int enable_bearer(struct tipc_bearer *tb_ptr)
121 struct net_device *dev = dev_base;
122 struct eth_bearer *eb_ptr = ð_bearers[0];
123 struct eth_bearer *stop = ð_bearers[MAX_ETH_BEARERS];
124 char *driver_name = strchr((const char *)tb_ptr->name, ':') + 1;
126 /* Find device with specified name */
128 while (dev && dev->name &&
129 (memcmp(dev->name, driver_name, strlen(dev->name)))) {
135 /* Find Ethernet bearer for device (or create one) */
137 for (;(eb_ptr != stop) && eb_ptr->dev && (eb_ptr->dev != dev); eb_ptr++);
142 eb_ptr->tipc_packet_type.type = __constant_htons(ETH_P_TIPC);
143 eb_ptr->tipc_packet_type.dev = dev;
144 eb_ptr->tipc_packet_type.func = recv_msg;
145 eb_ptr->tipc_packet_type.af_packet_priv = eb_ptr;
146 INIT_LIST_HEAD(&(eb_ptr->tipc_packet_type.list));
148 dev_add_pack(&eb_ptr->tipc_packet_type);
151 /* Associate TIPC bearer with Ethernet bearer */
153 eb_ptr->bearer = tb_ptr;
154 tb_ptr->usr_handle = (void *)eb_ptr;
155 tb_ptr->mtu = dev->mtu;
157 tb_ptr->addr.type = htonl(TIPC_MEDIA_TYPE_ETH);
158 memcpy(&tb_ptr->addr.dev_addr, &dev->dev_addr, ETH_ALEN);
163 * disable_bearer - detach TIPC bearer from an Ethernet interface
165 * We really should do dev_remove_pack() here, but this function can not be
166 * called at tasklet level. => Use eth_bearer->bearer as a flag to throw away
167 * incoming buffers, & postpone dev_remove_pack() to eth_media_stop() on exit.
170 static void disable_bearer(struct tipc_bearer *tb_ptr)
172 ((struct eth_bearer *)tb_ptr->usr_handle)->bearer = NULL;
176 * recv_notification - handle device updates from OS
178 * Change the state of the Ethernet bearer (if any) associated with the
182 static int recv_notification(struct notifier_block *nb, unsigned long evt,
185 struct net_device *dev = (struct net_device *)dv;
186 struct eth_bearer *eb_ptr = ð_bearers[0];
187 struct eth_bearer *stop = ð_bearers[MAX_ETH_BEARERS];
189 while ((eb_ptr->dev != dev)) {
190 if (++eb_ptr == stop)
191 return NOTIFY_DONE; /* couldn't find device */
194 return NOTIFY_DONE; /* bearer had been disabled */
196 eb_ptr->bearer->mtu = dev->mtu;
200 if (netif_carrier_ok(dev))
201 tipc_continue(eb_ptr->bearer);
203 tipc_block_bearer(eb_ptr->bearer->name);
206 tipc_continue(eb_ptr->bearer);
209 tipc_block_bearer(eb_ptr->bearer->name);
211 case NETDEV_CHANGEMTU:
212 case NETDEV_CHANGEADDR:
213 tipc_block_bearer(eb_ptr->bearer->name);
214 tipc_continue(eb_ptr->bearer);
216 case NETDEV_UNREGISTER:
217 case NETDEV_CHANGENAME:
218 tipc_disable_bearer(eb_ptr->bearer->name);
225 * eth_addr2str - convert Ethernet address to string
228 static char *eth_addr2str(struct tipc_media_addr *a, char *str_buf, int str_size)
230 unchar *addr = (unchar *)&a->dev_addr;
235 sprintf(str_buf, "%02x:%02x:%02x:%02x:%02x:%02x",
236 addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
241 * tipc_eth_media_start - activate Ethernet bearer support
243 * Register Ethernet media type with TIPC bearer code. Also register
244 * with OS for notifications about device state changes.
247 int tipc_eth_media_start(void)
249 struct tipc_media_addr bcast_addr;
255 memset(&bcast_addr, 0xff, sizeof(bcast_addr));
256 memset(eth_bearers, 0, sizeof(eth_bearers));
258 res = tipc_register_media(TIPC_MEDIA_TYPE_ETH, "eth",
259 enable_bearer, disable_bearer, send_msg,
260 eth_addr2str, &bcast_addr, ETH_LINK_PRIORITY,
261 ETH_LINK_TOLERANCE, ETH_LINK_WINDOW);
265 notifier.notifier_call = &recv_notification;
266 notifier.priority = 0;
267 res = register_netdevice_notifier(¬ifier);
274 * tipc_eth_media_stop - deactivate Ethernet bearer support
277 void tipc_eth_media_stop(void)
284 unregister_netdevice_notifier(¬ifier);
285 for (i = 0; i < MAX_ETH_BEARERS ; i++) {
286 if (eth_bearers[i].bearer) {
287 eth_bearers[i].bearer->blocked = 1;
288 eth_bearers[i].bearer = NULL;
290 if (eth_bearers[i].dev) {
291 dev_remove_pack(ð_bearers[i].tipc_packet_type);
292 dev_put(eth_bearers[i].dev);
295 memset(ð_bearers, 0, sizeof(eth_bearers));