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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
Allan Stephensbcd326e2011-05-27 13:59:17 -04005 * Copyright (c) 2005-2008, 2011, 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
Allan Stephensd265fef2010-11-30 12:00:53 +000037#include "core.h"
38#include "bearer.h"
39
Allan Stephens909234c2011-05-27 15:09:40 -040040#define MAX_ETH_BEARERS MAX_BEARERS
Per Lidenb97bf3f2006-01-02 19:04:38 +010041
42/**
43 * struct eth_bearer - Ethernet bearer data structure
44 * @bearer: ptr to associated "generic" bearer structure
45 * @dev: ptr to associated Ethernet network device
46 * @tipc_packet_type: used in binding TIPC to Ethernet driver
47 */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090048
Per Lidenb97bf3f2006-01-02 19:04:38 +010049struct eth_bearer {
50 struct tipc_bearer *bearer;
51 struct net_device *dev;
52 struct packet_type tipc_packet_type;
53};
54
55static struct eth_bearer eth_bearers[MAX_ETH_BEARERS];
Allan Stephense3ec9c72010-12-31 18:59:34 +000056static int eth_started;
Per Lidenb97bf3f2006-01-02 19:04:38 +010057static struct notifier_block notifier;
58
59/**
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090060 * send_msg - send a TIPC message out over an Ethernet interface
Per Lidenb97bf3f2006-01-02 19:04:38 +010061 */
62
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090063static int send_msg(struct sk_buff *buf, struct tipc_bearer *tb_ptr,
Per Lidenb97bf3f2006-01-02 19:04:38 +010064 struct tipc_media_addr *dest)
65{
66 struct sk_buff *clone;
67 struct net_device *dev;
Allan Stephens9fbfca02010-09-03 08:33:40 +000068 int delta;
Per Lidenb97bf3f2006-01-02 19:04:38 +010069
70 clone = skb_clone(buf, GFP_ATOMIC);
Allan Stephens9fbfca02010-09-03 08:33:40 +000071 if (!clone)
72 return 0;
73
74 dev = ((struct eth_bearer *)(tb_ptr->usr_handle))->dev;
75 delta = dev->hard_header_len - skb_headroom(buf);
76
77 if ((delta > 0) &&
78 pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) {
79 kfree_skb(clone);
80 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +010081 }
Allan Stephens9fbfca02010-09-03 08:33:40 +000082
83 skb_reset_network_header(clone);
84 clone->dev = dev;
85 dev_hard_header(clone, dev, ETH_P_TIPC, &dest->dev_addr.eth_addr,
86 dev->dev_addr, clone->len);
87 dev_queue_xmit(clone);
Allan Stephens0e35fd52008-07-14 22:44:01 -070088 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +010089}
90
91/**
92 * recv_msg - handle incoming TIPC message from an Ethernet interface
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090093 *
Allan Stephensf3ec75f2007-06-10 17:24:20 -070094 * Accept only packets explicitly sent to this node, or broadcast packets;
95 * ignores packets sent using Ethernet multicast, and traffic sent to other
96 * nodes (which can happen if interface is running in promiscuous mode).
Per Lidenb97bf3f2006-01-02 19:04:38 +010097 */
98
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090099static int recv_msg(struct sk_buff *buf, struct net_device *dev,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100100 struct packet_type *pt, struct net_device *orig_dev)
101{
102 struct eth_bearer *eb_ptr = (struct eth_bearer *)pt->af_packet_priv;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100103
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)) {
Paul Gortmakerb2abd4c2010-09-08 13:31:24 +0000111 buf->next = NULL;
112 tipc_recv_msg(buf, eb_ptr->bearer);
113 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100114 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100115 }
Jon Maloy5e3c8852006-06-25 23:36:43 -0700116 kfree_skb(buf);
Allan Stephens0e35fd52008-07-14 22:44:01 -0700117 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100118}
119
120/**
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900121 * enable_bearer - attach TIPC bearer to an Ethernet interface
Per Lidenb97bf3f2006-01-02 19:04:38 +0100122 */
123
124static int enable_bearer(struct tipc_bearer *tb_ptr)
125{
Jon Paul Maloycb283ea2007-05-23 15:11:15 -0700126 struct net_device *dev = NULL;
127 struct net_device *pdev = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100128 struct eth_bearer *eb_ptr = &eth_bearers[0];
129 struct eth_bearer *stop = &eth_bearers[MAX_ETH_BEARERS];
130 char *driver_name = strchr((const char *)tb_ptr->name, ':') + 1;
Allan Stephensd1fb6272010-09-03 08:33:42 +0000131 int pending_dev = 0;
132
133 /* Find unused Ethernet bearer structure */
134
135 while (eb_ptr->dev) {
136 if (!eb_ptr->bearer)
137 pending_dev++;
138 if (++eb_ptr == stop)
139 return pending_dev ? -EAGAIN : -EDQUOT;
140 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100141
142 /* Find device with specified name */
Jon Paul Maloycb283ea2007-05-23 15:11:15 -0700143
Allan Stephensbcd326e2011-05-27 13:59:17 -0400144 read_lock(&dev_base_lock);
Allan Stephens0e659672010-12-31 18:59:32 +0000145 for_each_netdev(&init_net, pdev) {
Jon Paul Maloycb283ea2007-05-23 15:11:15 -0700146 if (!strncmp(pdev->name, driver_name, IFNAMSIZ)) {
Pavel Emelianov7562f872007-05-03 15:13:45 -0700147 dev = pdev;
Allan Stephensbcd326e2011-05-27 13:59:17 -0400148 dev_hold(dev);
Pavel Emelianov7562f872007-05-03 15:13:45 -0700149 break;
150 }
Jon Paul Maloycb283ea2007-05-23 15:11:15 -0700151 }
Allan Stephensbcd326e2011-05-27 13:59:17 -0400152 read_unlock(&dev_base_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100153 if (!dev)
154 return -ENODEV;
155
Allan Stephens18abf0f2011-05-27 14:02:48 -0400156 /* Create Ethernet bearer for device */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100157
Allan Stephens18abf0f2011-05-27 14:02:48 -0400158 eb_ptr->dev = dev;
159 eb_ptr->tipc_packet_type.type = htons(ETH_P_TIPC);
160 eb_ptr->tipc_packet_type.dev = dev;
161 eb_ptr->tipc_packet_type.func = recv_msg;
162 eb_ptr->tipc_packet_type.af_packet_priv = eb_ptr;
163 INIT_LIST_HEAD(&(eb_ptr->tipc_packet_type.list));
164 dev_add_pack(&eb_ptr->tipc_packet_type);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100165
166 /* Associate TIPC bearer with Ethernet bearer */
167
168 eb_ptr->bearer = tb_ptr;
169 tb_ptr->usr_handle = (void *)eb_ptr;
170 tb_ptr->mtu = dev->mtu;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900171 tb_ptr->blocked = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100172 tb_ptr->addr.type = htonl(TIPC_MEDIA_TYPE_ETH);
Jiri Pirko3a6d54c2009-05-11 23:37:15 +0000173 memcpy(&tb_ptr->addr.dev_addr, dev->dev_addr, ETH_ALEN);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100174 return 0;
175}
176
177/**
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900178 * disable_bearer - detach TIPC bearer from an Ethernet interface
Per Lidenb97bf3f2006-01-02 19:04:38 +0100179 *
180 * We really should do dev_remove_pack() here, but this function can not be
181 * called at tasklet level. => Use eth_bearer->bearer as a flag to throw away
182 * incoming buffers, & postpone dev_remove_pack() to eth_media_stop() on exit.
183 */
184
185static void disable_bearer(struct tipc_bearer *tb_ptr)
186{
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800187 ((struct eth_bearer *)tb_ptr->usr_handle)->bearer = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100188}
189
190/**
191 * recv_notification - handle device updates from OS
192 *
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900193 * Change the state of the Ethernet bearer (if any) associated with the
Per Lidenb97bf3f2006-01-02 19:04:38 +0100194 * specified device.
195 */
196
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900197static int recv_notification(struct notifier_block *nb, unsigned long evt,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100198 void *dv)
199{
200 struct net_device *dev = (struct net_device *)dv;
201 struct eth_bearer *eb_ptr = &eth_bearers[0];
202 struct eth_bearer *stop = &eth_bearers[MAX_ETH_BEARERS];
203
YOSHIFUJI Hideaki721499e2008-07-19 22:34:43 -0700204 if (!net_eq(dev_net(dev), &init_net))
Eric W. Biedermane9dc8652007-09-12 13:02:17 +0200205 return NOTIFY_DONE;
206
Per Lidenb97bf3f2006-01-02 19:04:38 +0100207 while ((eb_ptr->dev != dev)) {
208 if (++eb_ptr == stop)
209 return NOTIFY_DONE; /* couldn't find device */
210 }
211 if (!eb_ptr->bearer)
212 return NOTIFY_DONE; /* bearer had been disabled */
213
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900214 eb_ptr->bearer->mtu = dev->mtu;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100215
216 switch (evt) {
217 case NETDEV_CHANGE:
218 if (netif_carrier_ok(dev))
219 tipc_continue(eb_ptr->bearer);
220 else
221 tipc_block_bearer(eb_ptr->bearer->name);
222 break;
223 case NETDEV_UP:
224 tipc_continue(eb_ptr->bearer);
225 break;
226 case NETDEV_DOWN:
227 tipc_block_bearer(eb_ptr->bearer->name);
228 break;
229 case NETDEV_CHANGEMTU:
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900230 case NETDEV_CHANGEADDR:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100231 tipc_block_bearer(eb_ptr->bearer->name);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900232 tipc_continue(eb_ptr->bearer);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100233 break;
234 case NETDEV_UNREGISTER:
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900235 case NETDEV_CHANGENAME:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100236 tipc_disable_bearer(eb_ptr->bearer->name);
237 break;
238 }
239 return NOTIFY_OK;
240}
241
242/**
243 * eth_addr2str - convert Ethernet address to string
244 */
245
246static char *eth_addr2str(struct tipc_media_addr *a, char *str_buf, int str_size)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900247{
Per Lidenb97bf3f2006-01-02 19:04:38 +0100248 unchar *addr = (unchar *)&a->dev_addr;
249
250 if (str_size < 18)
251 *str_buf = '\0';
252 else
Johannes Berge1749612008-10-27 15:59:26 -0700253 sprintf(str_buf, "%pM", addr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100254 return str_buf;
255}
256
Allan Stephens706767d2011-10-06 15:28:44 -0400257/*
258 * Ethernet media registration info
259 */
260
261static struct media eth_media_info = {
262 .send_msg = send_msg,
263 .enable_bearer = enable_bearer,
264 .disable_bearer = disable_bearer,
265 .addr2str = eth_addr2str,
266 .bcast_addr = { htonl(TIPC_MEDIA_TYPE_ETH),
267 { {0xff, 0xff, 0xff, 0xff, 0xff, 0xff} } },
268 .priority = TIPC_DEF_LINK_PRI,
269 .tolerance = TIPC_DEF_LINK_TOL,
270 .window = TIPC_DEF_LINK_WIN,
271 .type_id = TIPC_MEDIA_TYPE_ETH,
272 .name = "eth"
273};
274
Per Lidenb97bf3f2006-01-02 19:04:38 +0100275/**
Per Liden4323add2006-01-18 00:38:21 +0100276 * tipc_eth_media_start - activate Ethernet bearer support
Per Lidenb97bf3f2006-01-02 19:04:38 +0100277 *
278 * Register Ethernet media type with TIPC bearer code. Also register
279 * with OS for notifications about device state changes.
280 */
281
Per Liden4323add2006-01-18 00:38:21 +0100282int tipc_eth_media_start(void)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900283{
Per Lidenb97bf3f2006-01-02 19:04:38 +0100284 int res;
285
286 if (eth_started)
287 return -EINVAL;
288
Per Lidenb97bf3f2006-01-02 19:04:38 +0100289 memset(eth_bearers, 0, sizeof(eth_bearers));
290
Allan Stephens706767d2011-10-06 15:28:44 -0400291 res = tipc_register_media(&eth_media_info);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100292 if (res)
293 return res;
294
295 notifier.notifier_call = &recv_notification;
296 notifier.priority = 0;
297 res = register_netdevice_notifier(&notifier);
298 if (!res)
299 eth_started = 1;
300 return res;
301}
302
303/**
Per Liden4323add2006-01-18 00:38:21 +0100304 * tipc_eth_media_stop - deactivate Ethernet bearer support
Per Lidenb97bf3f2006-01-02 19:04:38 +0100305 */
306
Per Liden4323add2006-01-18 00:38:21 +0100307void tipc_eth_media_stop(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100308{
309 int i;
310
311 if (!eth_started)
312 return;
313
314 unregister_netdevice_notifier(&notifier);
315 for (i = 0; i < MAX_ETH_BEARERS ; i++) {
316 if (eth_bearers[i].bearer) {
317 eth_bearers[i].bearer->blocked = 1;
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800318 eth_bearers[i].bearer = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100319 }
320 if (eth_bearers[i].dev) {
321 dev_remove_pack(&eth_bearers[i].tipc_packet_type);
322 dev_put(eth_bearers[i].dev);
323 }
324 }
325 memset(&eth_bearers, 0, sizeof(eth_bearers));
326 eth_started = 0;
327}