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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
Allan Stephens687a25f2006-06-25 23:43:21 -07005 * Copyright (c) 2005-2006, 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)) {
Jon Maloy5e3c8852006-06-25 23:36:43 -0700101 if (likely(!dev->promiscuity) ||
102 !memcmp(buf->mac.raw,dev->dev_addr,ETH_ALEN) ||
103 !memcmp(buf->mac.raw,dev->broadcast,ETH_ALEN)) {
104 size = msg_size((struct tipc_msg *)buf->data);
105 skb_trim(buf, size);
106 if (likely(buf->len == size)) {
107 buf->next = NULL;
108 tipc_recv_msg(buf, eb_ptr->bearer);
109 return TIPC_OK;
110 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100111 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100112 }
Jon Maloy5e3c8852006-06-25 23:36:43 -0700113 kfree_skb(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100114 return TIPC_OK;
115}
116
117/**
118 * enable_bearer - attach TIPC bearer to an Ethernet interface
119 */
120
121static int enable_bearer(struct tipc_bearer *tb_ptr)
122{
123 struct net_device *dev = dev_base;
124 struct eth_bearer *eb_ptr = &eth_bearers[0];
125 struct eth_bearer *stop = &eth_bearers[MAX_ETH_BEARERS];
126 char *driver_name = strchr((const char *)tb_ptr->name, ':') + 1;
127
128 /* Find device with specified name */
129
Allan Stephens687a25f2006-06-25 23:43:21 -0700130 while (dev && dev->name && strncmp(dev->name, driver_name, IFNAMSIZ)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100131 dev = dev->next;
132 }
133 if (!dev)
134 return -ENODEV;
135
136 /* Find Ethernet bearer for device (or create one) */
137
138 for (;(eb_ptr != stop) && eb_ptr->dev && (eb_ptr->dev != dev); eb_ptr++);
139 if (eb_ptr == stop)
140 return -EDQUOT;
141 if (!eb_ptr->dev) {
142 eb_ptr->dev = dev;
Per Liden33a9c4d2006-01-16 11:42:12 +0100143 eb_ptr->tipc_packet_type.type = __constant_htons(ETH_P_TIPC);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100144 eb_ptr->tipc_packet_type.dev = dev;
145 eb_ptr->tipc_packet_type.func = recv_msg;
146 eb_ptr->tipc_packet_type.af_packet_priv = eb_ptr;
147 INIT_LIST_HEAD(&(eb_ptr->tipc_packet_type.list));
148 dev_hold(dev);
149 dev_add_pack(&eb_ptr->tipc_packet_type);
150 }
151
152 /* Associate TIPC bearer with Ethernet bearer */
153
154 eb_ptr->bearer = tb_ptr;
155 tb_ptr->usr_handle = (void *)eb_ptr;
156 tb_ptr->mtu = dev->mtu;
157 tb_ptr->blocked = 0;
158 tb_ptr->addr.type = htonl(TIPC_MEDIA_TYPE_ETH);
159 memcpy(&tb_ptr->addr.dev_addr, &dev->dev_addr, ETH_ALEN);
160 return 0;
161}
162
163/**
164 * disable_bearer - detach TIPC bearer from an Ethernet interface
165 *
166 * We really should do dev_remove_pack() here, but this function can not be
167 * called at tasklet level. => Use eth_bearer->bearer as a flag to throw away
168 * incoming buffers, & postpone dev_remove_pack() to eth_media_stop() on exit.
169 */
170
171static void disable_bearer(struct tipc_bearer *tb_ptr)
172{
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800173 ((struct eth_bearer *)tb_ptr->usr_handle)->bearer = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100174}
175
176/**
177 * recv_notification - handle device updates from OS
178 *
179 * Change the state of the Ethernet bearer (if any) associated with the
180 * specified device.
181 */
182
183static int recv_notification(struct notifier_block *nb, unsigned long evt,
184 void *dv)
185{
186 struct net_device *dev = (struct net_device *)dv;
187 struct eth_bearer *eb_ptr = &eth_bearers[0];
188 struct eth_bearer *stop = &eth_bearers[MAX_ETH_BEARERS];
189
190 while ((eb_ptr->dev != dev)) {
191 if (++eb_ptr == stop)
192 return NOTIFY_DONE; /* couldn't find device */
193 }
194 if (!eb_ptr->bearer)
195 return NOTIFY_DONE; /* bearer had been disabled */
196
197 eb_ptr->bearer->mtu = dev->mtu;
198
199 switch (evt) {
200 case NETDEV_CHANGE:
201 if (netif_carrier_ok(dev))
202 tipc_continue(eb_ptr->bearer);
203 else
204 tipc_block_bearer(eb_ptr->bearer->name);
205 break;
206 case NETDEV_UP:
207 tipc_continue(eb_ptr->bearer);
208 break;
209 case NETDEV_DOWN:
210 tipc_block_bearer(eb_ptr->bearer->name);
211 break;
212 case NETDEV_CHANGEMTU:
213 case NETDEV_CHANGEADDR:
214 tipc_block_bearer(eb_ptr->bearer->name);
215 tipc_continue(eb_ptr->bearer);
216 break;
217 case NETDEV_UNREGISTER:
218 case NETDEV_CHANGENAME:
219 tipc_disable_bearer(eb_ptr->bearer->name);
220 break;
221 }
222 return NOTIFY_OK;
223}
224
225/**
226 * eth_addr2str - convert Ethernet address to string
227 */
228
229static char *eth_addr2str(struct tipc_media_addr *a, char *str_buf, int str_size)
230{
231 unchar *addr = (unchar *)&a->dev_addr;
232
233 if (str_size < 18)
234 *str_buf = '\0';
235 else
236 sprintf(str_buf, "%02x:%02x:%02x:%02x:%02x:%02x",
237 addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
238 return str_buf;
239}
240
241/**
Per Liden4323add2006-01-18 00:38:21 +0100242 * tipc_eth_media_start - activate Ethernet bearer support
Per Lidenb97bf3f2006-01-02 19:04:38 +0100243 *
244 * Register Ethernet media type with TIPC bearer code. Also register
245 * with OS for notifications about device state changes.
246 */
247
Per Liden4323add2006-01-18 00:38:21 +0100248int tipc_eth_media_start(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100249{
250 struct tipc_media_addr bcast_addr;
251 int res;
252
253 if (eth_started)
254 return -EINVAL;
255
Allan Stephens49384502006-06-25 23:38:29 -0700256 bcast_addr.type = htonl(TIPC_MEDIA_TYPE_ETH);
257 memset(&bcast_addr.dev_addr, 0xff, ETH_ALEN);
258
Per Lidenb97bf3f2006-01-02 19:04:38 +0100259 memset(eth_bearers, 0, sizeof(eth_bearers));
260
261 res = tipc_register_media(TIPC_MEDIA_TYPE_ETH, "eth",
262 enable_bearer, disable_bearer, send_msg,
263 eth_addr2str, &bcast_addr, ETH_LINK_PRIORITY,
Per Liden16cb4b32006-01-13 22:22:22 +0100264 ETH_LINK_TOLERANCE, ETH_LINK_WINDOW);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100265 if (res)
266 return res;
267
268 notifier.notifier_call = &recv_notification;
269 notifier.priority = 0;
270 res = register_netdevice_notifier(&notifier);
271 if (!res)
272 eth_started = 1;
273 return res;
274}
275
276/**
Per Liden4323add2006-01-18 00:38:21 +0100277 * tipc_eth_media_stop - deactivate Ethernet bearer support
Per Lidenb97bf3f2006-01-02 19:04:38 +0100278 */
279
Per Liden4323add2006-01-18 00:38:21 +0100280void tipc_eth_media_stop(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100281{
282 int i;
283
284 if (!eth_started)
285 return;
286
287 unregister_netdevice_notifier(&notifier);
288 for (i = 0; i < MAX_ETH_BEARERS ; i++) {
289 if (eth_bearers[i].bearer) {
290 eth_bearers[i].bearer->blocked = 1;
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800291 eth_bearers[i].bearer = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100292 }
293 if (eth_bearers[i].dev) {
294 dev_remove_pack(&eth_bearers[i].tipc_packet_type);
295 dev_put(eth_bearers[i].dev);
296 }
297 }
298 memset(&eth_bearers, 0, sizeof(eth_bearers));
299 eth_started = 0;
300}