blob: 711ca4b1f051720ca546d6e722e1ab387a20ed21 [file] [log] [blame]
Per Lidenb97bf3f2006-01-02 19:04:38 +01001/*
2 * net/tipc/eth_media.c: Ethernet bearer support for TIPC
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09003 *
Allan Stephensf3ec75f2007-06-10 17:24:20 -07004 * Copyright (c) 2001-2007, Ericsson AB
5 * Copyright (c) 2005-2007, 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 */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090053
Per Lidenb97bf3f2006-01-02 19:04:38 +010054struct 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/**
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090065 * send_msg - send a TIPC message out over an Ethernet interface
Per Lidenb97bf3f2006-01-02 19:04:38 +010066 */
67
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090068static int send_msg(struct sk_buff *buf, struct tipc_bearer *tb_ptr,
Per Lidenb97bf3f2006-01-02 19:04:38 +010069 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) {
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -070076 skb_reset_network_header(clone);
Per Lidenb97bf3f2006-01-02 19:04:38 +010077 dev = ((struct eth_bearer *)(tb_ptr->usr_handle))->dev;
78 clone->dev = dev;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090079 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
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090089 *
Allan Stephensf3ec75f2007-06-10 17:24:20 -070090 * Accept only packets explicitly sent to this node, or broadcast packets;
91 * ignores packets sent using Ethernet multicast, and traffic sent to other
92 * nodes (which can happen if interface is running in promiscuous mode).
Per Lidenb97bf3f2006-01-02 19:04:38 +010093 * Routine truncates any Ethernet padding/CRC appended to the message,
94 * and ensures message size matches actual length
95 */
96
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090097static int recv_msg(struct sk_buff *buf, struct net_device *dev,
Per Lidenb97bf3f2006-01-02 19:04:38 +010098 struct packet_type *pt, struct net_device *orig_dev)
99{
100 struct eth_bearer *eb_ptr = (struct eth_bearer *)pt->af_packet_priv;
101 u32 size;
102
103 if (likely(eb_ptr->bearer)) {
Allan Stephensf3ec75f2007-06-10 17:24:20 -0700104 if (likely(buf->pkt_type <= PACKET_BROADCAST)) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900105 size = msg_size((struct tipc_msg *)buf->data);
106 skb_trim(buf, size);
107 if (likely(buf->len == size)) {
108 buf->next = NULL;
109 tipc_recv_msg(buf, eb_ptr->bearer);
110 return TIPC_OK;
Jon Maloy5e3c8852006-06-25 23:36:43 -0700111 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100112 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100113 }
Jon Maloy5e3c8852006-06-25 23:36:43 -0700114 kfree_skb(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100115 return TIPC_OK;
116}
117
118/**
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900119 * enable_bearer - attach TIPC bearer to an Ethernet interface
Per Lidenb97bf3f2006-01-02 19:04:38 +0100120 */
121
122static int enable_bearer(struct tipc_bearer *tb_ptr)
123{
Jon Paul Maloycb283ea2007-05-23 15:11:15 -0700124 struct net_device *dev = NULL;
125 struct net_device *pdev = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100126 struct eth_bearer *eb_ptr = &eth_bearers[0];
127 struct eth_bearer *stop = &eth_bearers[MAX_ETH_BEARERS];
128 char *driver_name = strchr((const char *)tb_ptr->name, ':') + 1;
129
130 /* Find device with specified name */
Jon Paul Maloycb283ea2007-05-23 15:11:15 -0700131
132 for_each_netdev(pdev){
133 if (!strncmp(pdev->name, driver_name, IFNAMSIZ)) {
Pavel Emelianov7562f872007-05-03 15:13:45 -0700134 dev = pdev;
135 break;
136 }
Jon Paul Maloycb283ea2007-05-23 15:11:15 -0700137 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100138 if (!dev)
139 return -ENODEV;
140
141 /* Find Ethernet bearer for device (or create one) */
142
143 for (;(eb_ptr != stop) && eb_ptr->dev && (eb_ptr->dev != dev); eb_ptr++);
144 if (eb_ptr == stop)
145 return -EDQUOT;
146 if (!eb_ptr->dev) {
147 eb_ptr->dev = dev;
YOSHIFUJI Hideaki02ea4922007-03-07 14:21:31 +0900148 eb_ptr->tipc_packet_type.type = htons(ETH_P_TIPC);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100149 eb_ptr->tipc_packet_type.dev = dev;
150 eb_ptr->tipc_packet_type.func = recv_msg;
151 eb_ptr->tipc_packet_type.af_packet_priv = eb_ptr;
152 INIT_LIST_HEAD(&(eb_ptr->tipc_packet_type.list));
153 dev_hold(dev);
154 dev_add_pack(&eb_ptr->tipc_packet_type);
155 }
156
157 /* Associate TIPC bearer with Ethernet bearer */
158
159 eb_ptr->bearer = tb_ptr;
160 tb_ptr->usr_handle = (void *)eb_ptr;
161 tb_ptr->mtu = dev->mtu;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900162 tb_ptr->blocked = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100163 tb_ptr->addr.type = htonl(TIPC_MEDIA_TYPE_ETH);
164 memcpy(&tb_ptr->addr.dev_addr, &dev->dev_addr, ETH_ALEN);
165 return 0;
166}
167
168/**
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900169 * disable_bearer - detach TIPC bearer from an Ethernet interface
Per Lidenb97bf3f2006-01-02 19:04:38 +0100170 *
171 * We really should do dev_remove_pack() here, but this function can not be
172 * called at tasklet level. => Use eth_bearer->bearer as a flag to throw away
173 * incoming buffers, & postpone dev_remove_pack() to eth_media_stop() on exit.
174 */
175
176static void disable_bearer(struct tipc_bearer *tb_ptr)
177{
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800178 ((struct eth_bearer *)tb_ptr->usr_handle)->bearer = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100179}
180
181/**
182 * recv_notification - handle device updates from OS
183 *
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900184 * Change the state of the Ethernet bearer (if any) associated with the
Per Lidenb97bf3f2006-01-02 19:04:38 +0100185 * specified device.
186 */
187
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900188static int recv_notification(struct notifier_block *nb, unsigned long evt,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100189 void *dv)
190{
191 struct net_device *dev = (struct net_device *)dv;
192 struct eth_bearer *eb_ptr = &eth_bearers[0];
193 struct eth_bearer *stop = &eth_bearers[MAX_ETH_BEARERS];
194
195 while ((eb_ptr->dev != dev)) {
196 if (++eb_ptr == stop)
197 return NOTIFY_DONE; /* couldn't find device */
198 }
199 if (!eb_ptr->bearer)
200 return NOTIFY_DONE; /* bearer had been disabled */
201
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900202 eb_ptr->bearer->mtu = dev->mtu;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100203
204 switch (evt) {
205 case NETDEV_CHANGE:
206 if (netif_carrier_ok(dev))
207 tipc_continue(eb_ptr->bearer);
208 else
209 tipc_block_bearer(eb_ptr->bearer->name);
210 break;
211 case NETDEV_UP:
212 tipc_continue(eb_ptr->bearer);
213 break;
214 case NETDEV_DOWN:
215 tipc_block_bearer(eb_ptr->bearer->name);
216 break;
217 case NETDEV_CHANGEMTU:
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900218 case NETDEV_CHANGEADDR:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100219 tipc_block_bearer(eb_ptr->bearer->name);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900220 tipc_continue(eb_ptr->bearer);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100221 break;
222 case NETDEV_UNREGISTER:
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900223 case NETDEV_CHANGENAME:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100224 tipc_disable_bearer(eb_ptr->bearer->name);
225 break;
226 }
227 return NOTIFY_OK;
228}
229
230/**
231 * eth_addr2str - convert Ethernet address to string
232 */
233
234static char *eth_addr2str(struct tipc_media_addr *a, char *str_buf, int str_size)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900235{
Per Lidenb97bf3f2006-01-02 19:04:38 +0100236 unchar *addr = (unchar *)&a->dev_addr;
237
238 if (str_size < 18)
239 *str_buf = '\0';
240 else
241 sprintf(str_buf, "%02x:%02x:%02x:%02x:%02x:%02x",
242 addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
243 return str_buf;
244}
245
246/**
Per Liden4323add2006-01-18 00:38:21 +0100247 * tipc_eth_media_start - activate Ethernet bearer support
Per Lidenb97bf3f2006-01-02 19:04:38 +0100248 *
249 * Register Ethernet media type with TIPC bearer code. Also register
250 * with OS for notifications about device state changes.
251 */
252
Per Liden4323add2006-01-18 00:38:21 +0100253int tipc_eth_media_start(void)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900254{
Per Lidenb97bf3f2006-01-02 19:04:38 +0100255 struct tipc_media_addr bcast_addr;
256 int res;
257
258 if (eth_started)
259 return -EINVAL;
260
Allan Stephens49384502006-06-25 23:38:29 -0700261 bcast_addr.type = htonl(TIPC_MEDIA_TYPE_ETH);
262 memset(&bcast_addr.dev_addr, 0xff, ETH_ALEN);
263
Per Lidenb97bf3f2006-01-02 19:04:38 +0100264 memset(eth_bearers, 0, sizeof(eth_bearers));
265
266 res = tipc_register_media(TIPC_MEDIA_TYPE_ETH, "eth",
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900267 enable_bearer, disable_bearer, send_msg,
268 eth_addr2str, &bcast_addr, ETH_LINK_PRIORITY,
Per Liden16cb4b32006-01-13 22:22:22 +0100269 ETH_LINK_TOLERANCE, ETH_LINK_WINDOW);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100270 if (res)
271 return res;
272
273 notifier.notifier_call = &recv_notification;
274 notifier.priority = 0;
275 res = register_netdevice_notifier(&notifier);
276 if (!res)
277 eth_started = 1;
278 return res;
279}
280
281/**
Per Liden4323add2006-01-18 00:38:21 +0100282 * tipc_eth_media_stop - deactivate Ethernet bearer support
Per Lidenb97bf3f2006-01-02 19:04:38 +0100283 */
284
Per Liden4323add2006-01-18 00:38:21 +0100285void tipc_eth_media_stop(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100286{
287 int i;
288
289 if (!eth_started)
290 return;
291
292 unregister_netdevice_notifier(&notifier);
293 for (i = 0; i < MAX_ETH_BEARERS ; i++) {
294 if (eth_bearers[i].bearer) {
295 eth_bearers[i].bearer->blocked = 1;
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800296 eth_bearers[i].bearer = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100297 }
298 if (eth_bearers[i].dev) {
299 dev_remove_pack(&eth_bearers[i].tipc_packet_type);
300 dev_put(eth_bearers[i].dev);
301 }
302 }
303 memset(&eth_bearers, 0, sizeof(eth_bearers));
304 eth_started = 0;
305}