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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>
Eric W. Biedermane730c152007-09-17 11:53:39 -070041#include <net/net_namespace.h>
Per Lidenb97bf3f2006-01-02 19:04:38 +010042
43#define MAX_ETH_BEARERS 2
Per Liden16cb4b32006-01-13 22:22:22 +010044#define ETH_LINK_PRIORITY TIPC_DEF_LINK_PRI
Per Lidenb97bf3f2006-01-02 19:04:38 +010045#define ETH_LINK_TOLERANCE TIPC_DEF_LINK_TOL
Per Liden16cb4b32006-01-13 22:22:22 +010046#define ETH_LINK_WINDOW TIPC_DEF_LINK_WIN
Per Lidenb97bf3f2006-01-02 19:04:38 +010047
48/**
49 * struct eth_bearer - Ethernet bearer data structure
50 * @bearer: ptr to associated "generic" bearer structure
51 * @dev: ptr to associated Ethernet network device
52 * @tipc_packet_type: used in binding TIPC to Ethernet driver
53 */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090054
Per Lidenb97bf3f2006-01-02 19:04:38 +010055struct eth_bearer {
56 struct tipc_bearer *bearer;
57 struct net_device *dev;
58 struct packet_type tipc_packet_type;
59};
60
61static struct eth_bearer eth_bearers[MAX_ETH_BEARERS];
62static int eth_started = 0;
63static struct notifier_block notifier;
64
65/**
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090066 * send_msg - send a TIPC message out over an Ethernet interface
Per Lidenb97bf3f2006-01-02 19:04:38 +010067 */
68
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090069static int send_msg(struct sk_buff *buf, struct tipc_bearer *tb_ptr,
Per Lidenb97bf3f2006-01-02 19:04:38 +010070 struct tipc_media_addr *dest)
71{
72 struct sk_buff *clone;
73 struct net_device *dev;
74
75 clone = skb_clone(buf, GFP_ATOMIC);
76 if (clone) {
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -070077 skb_reset_network_header(clone);
Per Lidenb97bf3f2006-01-02 19:04:38 +010078 dev = ((struct eth_bearer *)(tb_ptr->usr_handle))->dev;
79 clone->dev = dev;
Stephen Hemminger0c4e8582007-10-09 01:36:32 -070080 dev_hard_header(clone, dev, ETH_P_TIPC,
Per Lidenb97bf3f2006-01-02 19:04:38 +010081 &dest->dev_addr.eth_addr,
82 dev->dev_addr, clone->len);
83 dev_queue_xmit(clone);
84 }
Allan Stephens0e35fd52008-07-14 22:44:01 -070085 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +010086}
87
88/**
89 * recv_msg - handle incoming TIPC message from an Ethernet interface
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090090 *
Allan Stephensf3ec75f2007-06-10 17:24:20 -070091 * Accept only packets explicitly sent to this node, or broadcast packets;
92 * ignores packets sent using Ethernet multicast, and traffic sent to other
93 * nodes (which can happen if interface is running in promiscuous mode).
Per Lidenb97bf3f2006-01-02 19:04:38 +010094 * Routine truncates any Ethernet padding/CRC appended to the message,
95 * and ensures message size matches actual length
96 */
97
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090098static int recv_msg(struct sk_buff *buf, struct net_device *dev,
Per Lidenb97bf3f2006-01-02 19:04:38 +010099 struct packet_type *pt, struct net_device *orig_dev)
100{
101 struct eth_bearer *eb_ptr = (struct eth_bearer *)pt->af_packet_priv;
102 u32 size;
103
YOSHIFUJI Hideaki721499e2008-07-19 22:34:43 -0700104 if (!net_eq(dev_net(dev), &init_net)) {
Eric W. Biedermane730c152007-09-17 11:53:39 -0700105 kfree_skb(buf);
106 return 0;
107 }
108
Per Lidenb97bf3f2006-01-02 19:04:38 +0100109 if (likely(eb_ptr->bearer)) {
Allan Stephensf3ec75f2007-06-10 17:24:20 -0700110 if (likely(buf->pkt_type <= PACKET_BROADCAST)) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900111 size = msg_size((struct tipc_msg *)buf->data);
112 skb_trim(buf, size);
113 if (likely(buf->len == size)) {
114 buf->next = NULL;
115 tipc_recv_msg(buf, eb_ptr->bearer);
Allan Stephens0e35fd52008-07-14 22:44:01 -0700116 return 0;
Jon Maloy5e3c8852006-06-25 23:36:43 -0700117 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100118 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100119 }
Jon Maloy5e3c8852006-06-25 23:36:43 -0700120 kfree_skb(buf);
Allan Stephens0e35fd52008-07-14 22:44:01 -0700121 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100122}
123
124/**
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900125 * enable_bearer - attach TIPC bearer to an Ethernet interface
Per Lidenb97bf3f2006-01-02 19:04:38 +0100126 */
127
128static int enable_bearer(struct tipc_bearer *tb_ptr)
129{
Jon Paul Maloycb283ea2007-05-23 15:11:15 -0700130 struct net_device *dev = NULL;
131 struct net_device *pdev = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100132 struct eth_bearer *eb_ptr = &eth_bearers[0];
133 struct eth_bearer *stop = &eth_bearers[MAX_ETH_BEARERS];
134 char *driver_name = strchr((const char *)tb_ptr->name, ':') + 1;
135
136 /* Find device with specified name */
Jon Paul Maloycb283ea2007-05-23 15:11:15 -0700137
Eric W. Biederman881d9662007-09-17 11:56:21 -0700138 for_each_netdev(&init_net, pdev){
Jon Paul Maloycb283ea2007-05-23 15:11:15 -0700139 if (!strncmp(pdev->name, driver_name, IFNAMSIZ)) {
Pavel Emelianov7562f872007-05-03 15:13:45 -0700140 dev = pdev;
141 break;
142 }
Jon Paul Maloycb283ea2007-05-23 15:11:15 -0700143 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100144 if (!dev)
145 return -ENODEV;
146
147 /* Find Ethernet bearer for device (or create one) */
148
149 for (;(eb_ptr != stop) && eb_ptr->dev && (eb_ptr->dev != dev); eb_ptr++);
150 if (eb_ptr == stop)
151 return -EDQUOT;
152 if (!eb_ptr->dev) {
153 eb_ptr->dev = dev;
YOSHIFUJI Hideaki02ea4922007-03-07 14:21:31 +0900154 eb_ptr->tipc_packet_type.type = htons(ETH_P_TIPC);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100155 eb_ptr->tipc_packet_type.dev = dev;
156 eb_ptr->tipc_packet_type.func = recv_msg;
157 eb_ptr->tipc_packet_type.af_packet_priv = eb_ptr;
158 INIT_LIST_HEAD(&(eb_ptr->tipc_packet_type.list));
159 dev_hold(dev);
160 dev_add_pack(&eb_ptr->tipc_packet_type);
161 }
162
163 /* Associate TIPC bearer with Ethernet bearer */
164
165 eb_ptr->bearer = tb_ptr;
166 tb_ptr->usr_handle = (void *)eb_ptr;
167 tb_ptr->mtu = dev->mtu;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900168 tb_ptr->blocked = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100169 tb_ptr->addr.type = htonl(TIPC_MEDIA_TYPE_ETH);
Jiri Pirko3a6d54c2009-05-11 23:37:15 +0000170 memcpy(&tb_ptr->addr.dev_addr, dev->dev_addr, ETH_ALEN);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100171 return 0;
172}
173
174/**
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900175 * disable_bearer - detach TIPC bearer from an Ethernet interface
Per Lidenb97bf3f2006-01-02 19:04:38 +0100176 *
177 * We really should do dev_remove_pack() here, but this function can not be
178 * called at tasklet level. => Use eth_bearer->bearer as a flag to throw away
179 * incoming buffers, & postpone dev_remove_pack() to eth_media_stop() on exit.
180 */
181
182static void disable_bearer(struct tipc_bearer *tb_ptr)
183{
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800184 ((struct eth_bearer *)tb_ptr->usr_handle)->bearer = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100185}
186
187/**
188 * recv_notification - handle device updates from OS
189 *
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900190 * Change the state of the Ethernet bearer (if any) associated with the
Per Lidenb97bf3f2006-01-02 19:04:38 +0100191 * specified device.
192 */
193
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900194static int recv_notification(struct notifier_block *nb, unsigned long evt,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100195 void *dv)
196{
197 struct net_device *dev = (struct net_device *)dv;
198 struct eth_bearer *eb_ptr = &eth_bearers[0];
199 struct eth_bearer *stop = &eth_bearers[MAX_ETH_BEARERS];
200
YOSHIFUJI Hideaki721499e2008-07-19 22:34:43 -0700201 if (!net_eq(dev_net(dev), &init_net))
Eric W. Biedermane9dc8652007-09-12 13:02:17 +0200202 return NOTIFY_DONE;
203
Per Lidenb97bf3f2006-01-02 19:04:38 +0100204 while ((eb_ptr->dev != dev)) {
205 if (++eb_ptr == stop)
206 return NOTIFY_DONE; /* couldn't find device */
207 }
208 if (!eb_ptr->bearer)
209 return NOTIFY_DONE; /* bearer had been disabled */
210
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900211 eb_ptr->bearer->mtu = dev->mtu;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100212
213 switch (evt) {
214 case NETDEV_CHANGE:
215 if (netif_carrier_ok(dev))
216 tipc_continue(eb_ptr->bearer);
217 else
218 tipc_block_bearer(eb_ptr->bearer->name);
219 break;
220 case NETDEV_UP:
221 tipc_continue(eb_ptr->bearer);
222 break;
223 case NETDEV_DOWN:
224 tipc_block_bearer(eb_ptr->bearer->name);
225 break;
226 case NETDEV_CHANGEMTU:
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900227 case NETDEV_CHANGEADDR:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100228 tipc_block_bearer(eb_ptr->bearer->name);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900229 tipc_continue(eb_ptr->bearer);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100230 break;
231 case NETDEV_UNREGISTER:
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900232 case NETDEV_CHANGENAME:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100233 tipc_disable_bearer(eb_ptr->bearer->name);
234 break;
235 }
236 return NOTIFY_OK;
237}
238
239/**
240 * eth_addr2str - convert Ethernet address to string
241 */
242
243static char *eth_addr2str(struct tipc_media_addr *a, char *str_buf, int str_size)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900244{
Per Lidenb97bf3f2006-01-02 19:04:38 +0100245 unchar *addr = (unchar *)&a->dev_addr;
246
247 if (str_size < 18)
248 *str_buf = '\0';
249 else
Johannes Berge1749612008-10-27 15:59:26 -0700250 sprintf(str_buf, "%pM", addr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100251 return str_buf;
252}
253
254/**
Per Liden4323add2006-01-18 00:38:21 +0100255 * tipc_eth_media_start - activate Ethernet bearer support
Per Lidenb97bf3f2006-01-02 19:04:38 +0100256 *
257 * Register Ethernet media type with TIPC bearer code. Also register
258 * with OS for notifications about device state changes.
259 */
260
Per Liden4323add2006-01-18 00:38:21 +0100261int tipc_eth_media_start(void)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900262{
Per Lidenb97bf3f2006-01-02 19:04:38 +0100263 struct tipc_media_addr bcast_addr;
264 int res;
265
266 if (eth_started)
267 return -EINVAL;
268
Allan Stephens49384502006-06-25 23:38:29 -0700269 bcast_addr.type = htonl(TIPC_MEDIA_TYPE_ETH);
270 memset(&bcast_addr.dev_addr, 0xff, ETH_ALEN);
271
Per Lidenb97bf3f2006-01-02 19:04:38 +0100272 memset(eth_bearers, 0, sizeof(eth_bearers));
273
274 res = tipc_register_media(TIPC_MEDIA_TYPE_ETH, "eth",
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900275 enable_bearer, disable_bearer, send_msg,
276 eth_addr2str, &bcast_addr, ETH_LINK_PRIORITY,
Per Liden16cb4b32006-01-13 22:22:22 +0100277 ETH_LINK_TOLERANCE, ETH_LINK_WINDOW);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100278 if (res)
279 return res;
280
281 notifier.notifier_call = &recv_notification;
282 notifier.priority = 0;
283 res = register_netdevice_notifier(&notifier);
284 if (!res)
285 eth_started = 1;
286 return res;
287}
288
289/**
Per Liden4323add2006-01-18 00:38:21 +0100290 * tipc_eth_media_stop - deactivate Ethernet bearer support
Per Lidenb97bf3f2006-01-02 19:04:38 +0100291 */
292
Per Liden4323add2006-01-18 00:38:21 +0100293void tipc_eth_media_stop(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100294{
295 int i;
296
297 if (!eth_started)
298 return;
299
300 unregister_netdevice_notifier(&notifier);
301 for (i = 0; i < MAX_ETH_BEARERS ; i++) {
302 if (eth_bearers[i].bearer) {
303 eth_bearers[i].bearer->blocked = 1;
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800304 eth_bearers[i].bearer = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100305 }
306 if (eth_bearers[i].dev) {
307 dev_remove_pack(&eth_bearers[i].tipc_packet_type);
308 dev_put(eth_bearers[i].dev);
309 }
310 }
311 memset(&eth_bearers, 0, sizeof(eth_bearers));
312 eth_started = 0;
313}