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Per Lidenb97bf3f2006-01-02 19:04:38 +01001/*
2 * net/tipc/eth_media.c: Ethernet bearer support for TIPC
3 *
Per Liden593a5f22006-01-11 19:14:19 +01004 * Copyright (c) 2001-2006, Ericsson AB
Per Lidenb97bf3f2006-01-02 19:04:38 +01005 * Copyright (c) 2005, Wind River Systems
Per Lidenb97bf3f2006-01-02 19:04:38 +01006 * All rights reserved.
7 *
Per Liden9ea1fd32006-01-11 13:30:43 +01008 * Redistribution and use in source and binary forms, with or without
Per Lidenb97bf3f2006-01-02 19:04:38 +01009 * modification, are permitted provided that the following conditions are met:
10 *
Per Liden9ea1fd32006-01-11 13:30:43 +010011 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the names of the copyright holders nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
Per Lidenb97bf3f2006-01-02 19:04:38 +010019 *
Per Liden9ea1fd32006-01-11 13:30:43 +010020 * 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.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
Per Lidenb97bf3f2006-01-02 19:04:38 +010034 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
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>
Per Lidenb97bf3f2006-01-02 19:04:38 +010041
42#define MAX_ETH_BEARERS 2
Per Liden16cb4b32006-01-13 22:22:22 +010043#define ETH_LINK_PRIORITY TIPC_DEF_LINK_PRI
Per Lidenb97bf3f2006-01-02 19:04:38 +010044#define ETH_LINK_TOLERANCE TIPC_DEF_LINK_TOL
Per Liden16cb4b32006-01-13 22:22:22 +010045#define ETH_LINK_WINDOW TIPC_DEF_LINK_WIN
Per Lidenb97bf3f2006-01-02 19:04:38 +010046
47/**
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
52 */
53
54struct eth_bearer {
55 struct tipc_bearer *bearer;
56 struct net_device *dev;
57 struct packet_type tipc_packet_type;
58};
59
60static struct eth_bearer eth_bearers[MAX_ETH_BEARERS];
61static int eth_started = 0;
62static struct notifier_block notifier;
63
64/**
65 * send_msg - send a TIPC message out over an Ethernet interface
66 */
67
68static int send_msg(struct sk_buff *buf, struct tipc_bearer *tb_ptr,
69 struct tipc_media_addr *dest)
70{
71 struct sk_buff *clone;
72 struct net_device *dev;
73
74 clone = skb_clone(buf, GFP_ATOMIC);
75 if (clone) {
76 clone->nh.raw = clone->data;
77 dev = ((struct eth_bearer *)(tb_ptr->usr_handle))->dev;
78 clone->dev = dev;
Per Liden33a9c4d2006-01-16 11:42:12 +010079 dev->hard_header(clone, dev, ETH_P_TIPC,
Per Lidenb97bf3f2006-01-02 19:04:38 +010080 &dest->dev_addr.eth_addr,
81 dev->dev_addr, clone->len);
82 dev_queue_xmit(clone);
83 }
84 return TIPC_OK;
85}
86
87/**
88 * recv_msg - handle incoming TIPC message from an Ethernet interface
89 *
90 * Routine truncates any Ethernet padding/CRC appended to the message,
91 * and ensures message size matches actual length
92 */
93
94static int recv_msg(struct sk_buff *buf, struct net_device *dev,
95 struct packet_type *pt, struct net_device *orig_dev)
96{
97 struct eth_bearer *eb_ptr = (struct eth_bearer *)pt->af_packet_priv;
98 u32 size;
99
100 if (likely(eb_ptr->bearer)) {
101 size = msg_size((struct tipc_msg *)buf->data);
102 skb_trim(buf, size);
103 if (likely(buf->len == size)) {
104 buf->next = NULL;
105 tipc_recv_msg(buf, eb_ptr->bearer);
106 } else {
107 kfree_skb(buf);
108 }
109 } else {
110 kfree_skb(buf);
111 }
112 return TIPC_OK;
113}
114
115/**
116 * enable_bearer - attach TIPC bearer to an Ethernet interface
117 */
118
119static int enable_bearer(struct tipc_bearer *tb_ptr)
120{
121 struct net_device *dev = dev_base;
122 struct eth_bearer *eb_ptr = &eth_bearers[0];
123 struct eth_bearer *stop = &eth_bearers[MAX_ETH_BEARERS];
124 char *driver_name = strchr((const char *)tb_ptr->name, ':') + 1;
125
126 /* Find device with specified name */
127
128 while (dev && dev->name &&
129 (memcmp(dev->name, driver_name, strlen(dev->name)))) {
130 dev = dev->next;
131 }
132 if (!dev)
133 return -ENODEV;
134
135 /* Find Ethernet bearer for device (or create one) */
136
137 for (;(eb_ptr != stop) && eb_ptr->dev && (eb_ptr->dev != dev); eb_ptr++);
138 if (eb_ptr == stop)
139 return -EDQUOT;
140 if (!eb_ptr->dev) {
141 eb_ptr->dev = dev;
Per Liden33a9c4d2006-01-16 11:42:12 +0100142 eb_ptr->tipc_packet_type.type = __constant_htons(ETH_P_TIPC);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100143 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));
147 dev_hold(dev);
148 dev_add_pack(&eb_ptr->tipc_packet_type);
149 }
150
151 /* Associate TIPC bearer with Ethernet bearer */
152
153 eb_ptr->bearer = tb_ptr;
154 tb_ptr->usr_handle = (void *)eb_ptr;
155 tb_ptr->mtu = dev->mtu;
156 tb_ptr->blocked = 0;
157 tb_ptr->addr.type = htonl(TIPC_MEDIA_TYPE_ETH);
158 memcpy(&tb_ptr->addr.dev_addr, &dev->dev_addr, ETH_ALEN);
159 return 0;
160}
161
162/**
163 * disable_bearer - detach TIPC bearer from an Ethernet interface
164 *
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.
168 */
169
170static void disable_bearer(struct tipc_bearer *tb_ptr)
171{
172 ((struct eth_bearer *)tb_ptr->usr_handle)->bearer = 0;
173}
174
175/**
176 * recv_notification - handle device updates from OS
177 *
178 * Change the state of the Ethernet bearer (if any) associated with the
179 * specified device.
180 */
181
182static int recv_notification(struct notifier_block *nb, unsigned long evt,
183 void *dv)
184{
185 struct net_device *dev = (struct net_device *)dv;
186 struct eth_bearer *eb_ptr = &eth_bearers[0];
187 struct eth_bearer *stop = &eth_bearers[MAX_ETH_BEARERS];
188
189 while ((eb_ptr->dev != dev)) {
190 if (++eb_ptr == stop)
191 return NOTIFY_DONE; /* couldn't find device */
192 }
193 if (!eb_ptr->bearer)
194 return NOTIFY_DONE; /* bearer had been disabled */
195
196 eb_ptr->bearer->mtu = dev->mtu;
197
198 switch (evt) {
199 case NETDEV_CHANGE:
200 if (netif_carrier_ok(dev))
201 tipc_continue(eb_ptr->bearer);
202 else
203 tipc_block_bearer(eb_ptr->bearer->name);
204 break;
205 case NETDEV_UP:
206 tipc_continue(eb_ptr->bearer);
207 break;
208 case NETDEV_DOWN:
209 tipc_block_bearer(eb_ptr->bearer->name);
210 break;
211 case NETDEV_CHANGEMTU:
212 case NETDEV_CHANGEADDR:
213 tipc_block_bearer(eb_ptr->bearer->name);
214 tipc_continue(eb_ptr->bearer);
215 break;
216 case NETDEV_UNREGISTER:
217 case NETDEV_CHANGENAME:
218 tipc_disable_bearer(eb_ptr->bearer->name);
219 break;
220 }
221 return NOTIFY_OK;
222}
223
224/**
225 * eth_addr2str - convert Ethernet address to string
226 */
227
228static char *eth_addr2str(struct tipc_media_addr *a, char *str_buf, int str_size)
229{
230 unchar *addr = (unchar *)&a->dev_addr;
231
232 if (str_size < 18)
233 *str_buf = '\0';
234 else
235 sprintf(str_buf, "%02x:%02x:%02x:%02x:%02x:%02x",
236 addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
237 return str_buf;
238}
239
240/**
Per Liden4323add2006-01-18 00:38:21 +0100241 * tipc_eth_media_start - activate Ethernet bearer support
Per Lidenb97bf3f2006-01-02 19:04:38 +0100242 *
243 * Register Ethernet media type with TIPC bearer code. Also register
244 * with OS for notifications about device state changes.
245 */
246
Per Liden4323add2006-01-18 00:38:21 +0100247int tipc_eth_media_start(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100248{
249 struct tipc_media_addr bcast_addr;
250 int res;
251
252 if (eth_started)
253 return -EINVAL;
254
255 memset(&bcast_addr, 0xff, sizeof(bcast_addr));
256 memset(eth_bearers, 0, sizeof(eth_bearers));
257
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,
Per Liden16cb4b32006-01-13 22:22:22 +0100261 ETH_LINK_TOLERANCE, ETH_LINK_WINDOW);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100262 if (res)
263 return res;
264
265 notifier.notifier_call = &recv_notification;
266 notifier.priority = 0;
267 res = register_netdevice_notifier(&notifier);
268 if (!res)
269 eth_started = 1;
270 return res;
271}
272
273/**
Per Liden4323add2006-01-18 00:38:21 +0100274 * tipc_eth_media_stop - deactivate Ethernet bearer support
Per Lidenb97bf3f2006-01-02 19:04:38 +0100275 */
276
Per Liden4323add2006-01-18 00:38:21 +0100277void tipc_eth_media_stop(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100278{
279 int i;
280
281 if (!eth_started)
282 return;
283
284 unregister_netdevice_notifier(&notifier);
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 = 0;
289 }
290 if (eth_bearers[i].dev) {
291 dev_remove_pack(&eth_bearers[i].tipc_packet_type);
292 dev_put(eth_bearers[i].dev);
293 }
294 }
295 memset(&eth_bearers, 0, sizeof(eth_bearers));
296 eth_started = 0;
297}