2 * net/tipc/eth_media.c: Ethernet bearer support for TIPC
4 * Copyright (c) 2001-2007, Ericsson AB
5 * Copyright (c) 2005-2007, 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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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.
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"
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
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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>
41 #include <net/net_namespace.h>
43 #define MAX_ETH_BEARERS 2
44 #define ETH_LINK_PRIORITY TIPC_DEF_LINK_PRI
45 #define ETH_LINK_TOLERANCE TIPC_DEF_LINK_TOL
46 #define ETH_LINK_WINDOW TIPC_DEF_LINK_WIN
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
56 struct tipc_bearer
*bearer
;
57 struct net_device
*dev
;
58 struct packet_type tipc_packet_type
;
61 static struct eth_bearer eth_bearers
[MAX_ETH_BEARERS
];
62 static int eth_started
= 0;
63 static struct notifier_block notifier
;
66 * send_msg - send a TIPC message out over an Ethernet interface
69 static int send_msg(struct sk_buff
*buf
, struct tipc_bearer
*tb_ptr
,
70 struct tipc_media_addr
*dest
)
72 struct sk_buff
*clone
;
73 struct net_device
*dev
;
75 clone
= skb_clone(buf
, GFP_ATOMIC
);
77 skb_reset_network_header(clone
);
78 dev
= ((struct eth_bearer
*)(tb_ptr
->usr_handle
))->dev
;
80 dev_hard_header(clone
, dev
, ETH_P_TIPC
,
81 &dest
->dev_addr
.eth_addr
,
82 dev
->dev_addr
, clone
->len
);
83 dev_queue_xmit(clone
);
89 * recv_msg - handle incoming TIPC message from an Ethernet interface
91 * 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).
94 * Routine truncates any Ethernet padding/CRC appended to the message,
95 * and ensures message size matches actual length
98 static int recv_msg(struct sk_buff
*buf
, struct net_device
*dev
,
99 struct packet_type
*pt
, struct net_device
*orig_dev
)
101 struct eth_bearer
*eb_ptr
= (struct eth_bearer
*)pt
->af_packet_priv
;
104 if (!net_eq(dev_net(dev
), &init_net
)) {
109 if (likely(eb_ptr
->bearer
)) {
110 if (likely(buf
->pkt_type
<= PACKET_BROADCAST
)) {
111 size
= msg_size((struct tipc_msg
*)buf
->data
);
113 if (likely(buf
->len
== size
)) {
115 tipc_recv_msg(buf
, eb_ptr
->bearer
);
125 * enable_bearer - attach TIPC bearer to an Ethernet interface
128 static int enable_bearer(struct tipc_bearer
*tb_ptr
)
130 struct net_device
*dev
= NULL
;
131 struct net_device
*pdev
= NULL
;
132 struct eth_bearer
*eb_ptr
= ð_bearers
[0];
133 struct eth_bearer
*stop
= ð_bearers
[MAX_ETH_BEARERS
];
134 char *driver_name
= strchr((const char *)tb_ptr
->name
, ':') + 1;
136 /* Find device with specified name */
138 for_each_netdev(&init_net
, pdev
){
139 if (!strncmp(pdev
->name
, driver_name
, IFNAMSIZ
)) {
147 /* Find Ethernet bearer for device (or create one) */
149 for (;(eb_ptr
!= stop
) && eb_ptr
->dev
&& (eb_ptr
->dev
!= dev
); eb_ptr
++);
154 eb_ptr
->tipc_packet_type
.type
= htons(ETH_P_TIPC
);
155 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
));
160 dev_add_pack(&eb_ptr
->tipc_packet_type
);
163 /* Associate TIPC bearer with Ethernet bearer */
165 eb_ptr
->bearer
= tb_ptr
;
166 tb_ptr
->usr_handle
= (void *)eb_ptr
;
167 tb_ptr
->mtu
= dev
->mtu
;
169 tb_ptr
->addr
.type
= htonl(TIPC_MEDIA_TYPE_ETH
);
170 memcpy(&tb_ptr
->addr
.dev_addr
, &dev
->dev_addr
, ETH_ALEN
);
175 * disable_bearer - detach TIPC bearer from an Ethernet interface
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.
182 static void disable_bearer(struct tipc_bearer
*tb_ptr
)
184 ((struct eth_bearer
*)tb_ptr
->usr_handle
)->bearer
= NULL
;
188 * recv_notification - handle device updates from OS
190 * Change the state of the Ethernet bearer (if any) associated with the
194 static int recv_notification(struct notifier_block
*nb
, unsigned long evt
,
197 struct net_device
*dev
= (struct net_device
*)dv
;
198 struct eth_bearer
*eb_ptr
= ð_bearers
[0];
199 struct eth_bearer
*stop
= ð_bearers
[MAX_ETH_BEARERS
];
201 if (!net_eq(dev_net(dev
), &init_net
))
204 while ((eb_ptr
->dev
!= dev
)) {
205 if (++eb_ptr
== stop
)
206 return NOTIFY_DONE
; /* couldn't find device */
209 return NOTIFY_DONE
; /* bearer had been disabled */
211 eb_ptr
->bearer
->mtu
= dev
->mtu
;
215 if (netif_carrier_ok(dev
))
216 tipc_continue(eb_ptr
->bearer
);
218 tipc_block_bearer(eb_ptr
->bearer
->name
);
221 tipc_continue(eb_ptr
->bearer
);
224 tipc_block_bearer(eb_ptr
->bearer
->name
);
226 case NETDEV_CHANGEMTU
:
227 case NETDEV_CHANGEADDR
:
228 tipc_block_bearer(eb_ptr
->bearer
->name
);
229 tipc_continue(eb_ptr
->bearer
);
231 case NETDEV_UNREGISTER
:
232 case NETDEV_CHANGENAME
:
233 tipc_disable_bearer(eb_ptr
->bearer
->name
);
240 * eth_addr2str - convert Ethernet address to string
243 static char *eth_addr2str(struct tipc_media_addr
*a
, char *str_buf
, int str_size
)
245 unchar
*addr
= (unchar
*)&a
->dev_addr
;
250 sprintf(str_buf
, "%pM", addr
);
255 * tipc_eth_media_start - activate Ethernet bearer support
257 * Register Ethernet media type with TIPC bearer code. Also register
258 * with OS for notifications about device state changes.
261 int tipc_eth_media_start(void)
263 struct tipc_media_addr bcast_addr
;
269 bcast_addr
.type
= htonl(TIPC_MEDIA_TYPE_ETH
);
270 memset(&bcast_addr
.dev_addr
, 0xff, ETH_ALEN
);
272 memset(eth_bearers
, 0, sizeof(eth_bearers
));
274 res
= tipc_register_media(TIPC_MEDIA_TYPE_ETH
, "eth",
275 enable_bearer
, disable_bearer
, send_msg
,
276 eth_addr2str
, &bcast_addr
, ETH_LINK_PRIORITY
,
277 ETH_LINK_TOLERANCE
, ETH_LINK_WINDOW
);
281 notifier
.notifier_call
= &recv_notification
;
282 notifier
.priority
= 0;
283 res
= register_netdevice_notifier(¬ifier
);
290 * tipc_eth_media_stop - deactivate Ethernet bearer support
293 void tipc_eth_media_stop(void)
300 unregister_netdevice_notifier(¬ifier
);
301 for (i
= 0; i
< MAX_ETH_BEARERS
; i
++) {
302 if (eth_bearers
[i
].bearer
) {
303 eth_bearers
[i
].bearer
->blocked
= 1;
304 eth_bearers
[i
].bearer
= NULL
;
306 if (eth_bearers
[i
].dev
) {
307 dev_remove_pack(ð_bearers
[i
].tipc_packet_type
);
308 dev_put(eth_bearers
[i
].dev
);
311 memset(ð_bearers
, 0, sizeof(eth_bearers
));