2 * net/tipc/eth_media.c: Ethernet bearer support for TIPC
4 * Copyright (c) 2001-2006, Ericsson AB
5 * Copyright (c) 2005-2006, Wind River Systems
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9 * modification, are permitted provided that the following conditions are met:
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14 * notice, this list of conditions and the following disclaimer in the
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17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
20 * 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.
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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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>
42 #define MAX_ETH_BEARERS 2
43 #define ETH_LINK_PRIORITY TIPC_DEF_LINK_PRI
44 #define ETH_LINK_TOLERANCE TIPC_DEF_LINK_TOL
45 #define ETH_LINK_WINDOW TIPC_DEF_LINK_WIN
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
55 struct tipc_bearer
*bearer
;
56 struct net_device
*dev
;
57 struct packet_type tipc_packet_type
;
60 static struct eth_bearer eth_bearers
[MAX_ETH_BEARERS
];
61 static int eth_started
= 0;
62 static struct notifier_block notifier
;
65 * send_msg - send a TIPC message out over an Ethernet interface
68 static int send_msg(struct sk_buff
*buf
, struct tipc_bearer
*tb_ptr
,
69 struct tipc_media_addr
*dest
)
71 struct sk_buff
*clone
;
72 struct net_device
*dev
;
74 clone
= skb_clone(buf
, GFP_ATOMIC
);
76 clone
->nh
.raw
= clone
->data
;
77 dev
= ((struct eth_bearer
*)(tb_ptr
->usr_handle
))->dev
;
79 dev
->hard_header(clone
, dev
, ETH_P_TIPC
,
80 &dest
->dev_addr
.eth_addr
,
81 dev
->dev_addr
, clone
->len
);
82 dev_queue_xmit(clone
);
88 * recv_msg - handle incoming TIPC message from an Ethernet interface
90 * Routine truncates any Ethernet padding/CRC appended to the message,
91 * and ensures message size matches actual length
94 static int recv_msg(struct sk_buff
*buf
, struct net_device
*dev
,
95 struct packet_type
*pt
, struct net_device
*orig_dev
)
97 struct eth_bearer
*eb_ptr
= (struct eth_bearer
*)pt
->af_packet_priv
;
100 if (likely(eb_ptr
->bearer
)) {
101 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
);
106 if (likely(buf
->len
== size
)) {
108 tipc_recv_msg(buf
, eb_ptr
->bearer
);
118 * enable_bearer - attach TIPC bearer to an Ethernet interface
121 static int enable_bearer(struct tipc_bearer
*tb_ptr
)
123 struct net_device
*dev
= dev_base
;
124 struct eth_bearer
*eb_ptr
= ð_bearers
[0];
125 struct eth_bearer
*stop
= ð_bearers
[MAX_ETH_BEARERS
];
126 char *driver_name
= strchr((const char *)tb_ptr
->name
, ':') + 1;
128 /* Find device with specified name */
130 while (dev
&& dev
->name
&& strncmp(dev
->name
, driver_name
, IFNAMSIZ
)) {
136 /* Find Ethernet bearer for device (or create one) */
138 for (;(eb_ptr
!= stop
) && eb_ptr
->dev
&& (eb_ptr
->dev
!= dev
); eb_ptr
++);
143 eb_ptr
->tipc_packet_type
.type
= __constant_htons(ETH_P_TIPC
);
144 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
));
149 dev_add_pack(&eb_ptr
->tipc_packet_type
);
152 /* Associate TIPC bearer with Ethernet bearer */
154 eb_ptr
->bearer
= tb_ptr
;
155 tb_ptr
->usr_handle
= (void *)eb_ptr
;
156 tb_ptr
->mtu
= dev
->mtu
;
158 tb_ptr
->addr
.type
= htonl(TIPC_MEDIA_TYPE_ETH
);
159 memcpy(&tb_ptr
->addr
.dev_addr
, &dev
->dev_addr
, ETH_ALEN
);
164 * disable_bearer - detach TIPC bearer from an Ethernet interface
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.
171 static void disable_bearer(struct tipc_bearer
*tb_ptr
)
173 ((struct eth_bearer
*)tb_ptr
->usr_handle
)->bearer
= NULL
;
177 * recv_notification - handle device updates from OS
179 * Change the state of the Ethernet bearer (if any) associated with the
183 static int recv_notification(struct notifier_block
*nb
, unsigned long evt
,
186 struct net_device
*dev
= (struct net_device
*)dv
;
187 struct eth_bearer
*eb_ptr
= ð_bearers
[0];
188 struct eth_bearer
*stop
= ð_bearers
[MAX_ETH_BEARERS
];
190 while ((eb_ptr
->dev
!= dev
)) {
191 if (++eb_ptr
== stop
)
192 return NOTIFY_DONE
; /* couldn't find device */
195 return NOTIFY_DONE
; /* bearer had been disabled */
197 eb_ptr
->bearer
->mtu
= dev
->mtu
;
201 if (netif_carrier_ok(dev
))
202 tipc_continue(eb_ptr
->bearer
);
204 tipc_block_bearer(eb_ptr
->bearer
->name
);
207 tipc_continue(eb_ptr
->bearer
);
210 tipc_block_bearer(eb_ptr
->bearer
->name
);
212 case NETDEV_CHANGEMTU
:
213 case NETDEV_CHANGEADDR
:
214 tipc_block_bearer(eb_ptr
->bearer
->name
);
215 tipc_continue(eb_ptr
->bearer
);
217 case NETDEV_UNREGISTER
:
218 case NETDEV_CHANGENAME
:
219 tipc_disable_bearer(eb_ptr
->bearer
->name
);
226 * eth_addr2str - convert Ethernet address to string
229 static char *eth_addr2str(struct tipc_media_addr
*a
, char *str_buf
, int str_size
)
231 unchar
*addr
= (unchar
*)&a
->dev_addr
;
236 sprintf(str_buf
, "%02x:%02x:%02x:%02x:%02x:%02x",
237 addr
[0], addr
[1], addr
[2], addr
[3], addr
[4], addr
[5]);
242 * tipc_eth_media_start - activate Ethernet bearer support
244 * Register Ethernet media type with TIPC bearer code. Also register
245 * with OS for notifications about device state changes.
248 int tipc_eth_media_start(void)
250 struct tipc_media_addr bcast_addr
;
256 bcast_addr
.type
= htonl(TIPC_MEDIA_TYPE_ETH
);
257 memset(&bcast_addr
.dev_addr
, 0xff, ETH_ALEN
);
259 memset(eth_bearers
, 0, sizeof(eth_bearers
));
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
,
264 ETH_LINK_TOLERANCE
, ETH_LINK_WINDOW
);
268 notifier
.notifier_call
= &recv_notification
;
269 notifier
.priority
= 0;
270 res
= register_netdevice_notifier(¬ifier
);
277 * tipc_eth_media_stop - deactivate Ethernet bearer support
280 void tipc_eth_media_stop(void)
287 unregister_netdevice_notifier(¬ifier
);
288 for (i
= 0; i
< MAX_ETH_BEARERS
; i
++) {
289 if (eth_bearers
[i
].bearer
) {
290 eth_bearers
[i
].bearer
->blocked
= 1;
291 eth_bearers
[i
].bearer
= NULL
;
293 if (eth_bearers
[i
].dev
) {
294 dev_remove_pack(ð_bearers
[i
].tipc_packet_type
);
295 dev_put(eth_bearers
[i
].dev
);
298 memset(ð_bearers
, 0, sizeof(eth_bearers
));