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1 | /* |
2 | * net/tipc/eth_media.c: Ethernet bearer support for TIPC | |
3 | * | |
4 | * Copyright (c) 2003-2005, Ericsson Research Canada | |
5 | * Copyright (c) 2005, Wind River Systems | |
6 | * Copyright (c) 2005-2006, Ericsson AB | |
7 | * All rights reserved. | |
8 | * | |
9ea1fd3c | 9 | * Redistribution and use in source and binary forms, with or without |
b97bf3fd PL |
10 | * modification, are permitted provided that the following conditions are met: |
11 | * | |
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12 | * 1. Redistributions of source code must retain the above copyright |
13 | * notice, this list of conditions and the following disclaimer. | |
14 | * 2. Redistributions in binary form must reproduce the above copyright | |
15 | * notice, this list of conditions and the following disclaimer in the | |
16 | * documentation and/or other materials provided with the distribution. | |
17 | * 3. Neither the names of the copyright holders nor the names of its | |
18 | * contributors may be used to endorse or promote products derived from | |
19 | * this software without specific prior written permission. | |
b97bf3fd | 20 | * |
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21 | * Alternatively, this software may be distributed under the terms of the |
22 | * GNU General Public License ("GPL") version 2 as published by the Free | |
23 | * Software Foundation. | |
24 | * | |
25 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
26 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
27 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
28 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
29 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
30 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
31 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
32 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
33 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
34 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
b97bf3fd PL |
35 | * POSSIBILITY OF SUCH DAMAGE. |
36 | */ | |
37 | ||
38 | #include <net/tipc/tipc.h> | |
39 | #include <net/tipc/tipc_bearer.h> | |
40 | #include <net/tipc/tipc_msg.h> | |
41 | #include <linux/netdevice.h> | |
42 | #include <linux/version.h> | |
43 | ||
44 | #define MAX_ETH_BEARERS 2 | |
45 | #define TIPC_PROTOCOL 0x88ca | |
46 | #define ETH_LINK_PRIORITY 10 | |
47 | #define ETH_LINK_TOLERANCE TIPC_DEF_LINK_TOL | |
48 | ||
49 | ||
50 | /** | |
51 | * struct eth_bearer - Ethernet bearer data structure | |
52 | * @bearer: ptr to associated "generic" bearer structure | |
53 | * @dev: ptr to associated Ethernet network device | |
54 | * @tipc_packet_type: used in binding TIPC to Ethernet driver | |
55 | */ | |
56 | ||
57 | struct eth_bearer { | |
58 | struct tipc_bearer *bearer; | |
59 | struct net_device *dev; | |
60 | struct packet_type tipc_packet_type; | |
61 | }; | |
62 | ||
63 | static struct eth_bearer eth_bearers[MAX_ETH_BEARERS]; | |
64 | static int eth_started = 0; | |
65 | static struct notifier_block notifier; | |
66 | ||
67 | /** | |
68 | * send_msg - send a TIPC message out over an Ethernet interface | |
69 | */ | |
70 | ||
71 | static int send_msg(struct sk_buff *buf, struct tipc_bearer *tb_ptr, | |
72 | struct tipc_media_addr *dest) | |
73 | { | |
74 | struct sk_buff *clone; | |
75 | struct net_device *dev; | |
76 | ||
77 | clone = skb_clone(buf, GFP_ATOMIC); | |
78 | if (clone) { | |
79 | clone->nh.raw = clone->data; | |
80 | dev = ((struct eth_bearer *)(tb_ptr->usr_handle))->dev; | |
81 | clone->dev = dev; | |
82 | dev->hard_header(clone, dev, TIPC_PROTOCOL, | |
83 | &dest->dev_addr.eth_addr, | |
84 | dev->dev_addr, clone->len); | |
85 | dev_queue_xmit(clone); | |
86 | } | |
87 | return TIPC_OK; | |
88 | } | |
89 | ||
90 | /** | |
91 | * recv_msg - handle incoming TIPC message from an Ethernet interface | |
92 | * | |
93 | * Routine truncates any Ethernet padding/CRC appended to the message, | |
94 | * and ensures message size matches actual length | |
95 | */ | |
96 | ||
97 | static int recv_msg(struct sk_buff *buf, struct net_device *dev, | |
98 | 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)) { | |
104 | size = msg_size((struct tipc_msg *)buf->data); | |
105 | skb_trim(buf, size); | |
106 | if (likely(buf->len == size)) { | |
107 | buf->next = NULL; | |
108 | tipc_recv_msg(buf, eb_ptr->bearer); | |
109 | } else { | |
110 | kfree_skb(buf); | |
111 | } | |
112 | } else { | |
113 | kfree_skb(buf); | |
114 | } | |
115 | return TIPC_OK; | |
116 | } | |
117 | ||
118 | /** | |
119 | * enable_bearer - attach TIPC bearer to an Ethernet interface | |
120 | */ | |
121 | ||
122 | static int enable_bearer(struct tipc_bearer *tb_ptr) | |
123 | { | |
124 | struct net_device *dev = dev_base; | |
125 | struct eth_bearer *eb_ptr = ð_bearers[0]; | |
126 | struct eth_bearer *stop = ð_bearers[MAX_ETH_BEARERS]; | |
127 | char *driver_name = strchr((const char *)tb_ptr->name, ':') + 1; | |
128 | ||
129 | /* Find device with specified name */ | |
130 | ||
131 | while (dev && dev->name && | |
132 | (memcmp(dev->name, driver_name, strlen(dev->name)))) { | |
133 | dev = dev->next; | |
134 | } | |
135 | if (!dev) | |
136 | return -ENODEV; | |
137 | ||
138 | /* Find Ethernet bearer for device (or create one) */ | |
139 | ||
140 | for (;(eb_ptr != stop) && eb_ptr->dev && (eb_ptr->dev != dev); eb_ptr++); | |
141 | if (eb_ptr == stop) | |
142 | return -EDQUOT; | |
143 | if (!eb_ptr->dev) { | |
144 | eb_ptr->dev = dev; | |
145 | eb_ptr->tipc_packet_type.type = __constant_htons(TIPC_PROTOCOL); | |
146 | eb_ptr->tipc_packet_type.dev = dev; | |
147 | eb_ptr->tipc_packet_type.func = recv_msg; | |
148 | eb_ptr->tipc_packet_type.af_packet_priv = eb_ptr; | |
149 | INIT_LIST_HEAD(&(eb_ptr->tipc_packet_type.list)); | |
150 | dev_hold(dev); | |
151 | dev_add_pack(&eb_ptr->tipc_packet_type); | |
152 | } | |
153 | ||
154 | /* Associate TIPC bearer with Ethernet bearer */ | |
155 | ||
156 | eb_ptr->bearer = tb_ptr; | |
157 | tb_ptr->usr_handle = (void *)eb_ptr; | |
158 | tb_ptr->mtu = dev->mtu; | |
159 | tb_ptr->blocked = 0; | |
160 | tb_ptr->addr.type = htonl(TIPC_MEDIA_TYPE_ETH); | |
161 | memcpy(&tb_ptr->addr.dev_addr, &dev->dev_addr, ETH_ALEN); | |
162 | return 0; | |
163 | } | |
164 | ||
165 | /** | |
166 | * disable_bearer - detach TIPC bearer from an Ethernet interface | |
167 | * | |
168 | * We really should do dev_remove_pack() here, but this function can not be | |
169 | * called at tasklet level. => Use eth_bearer->bearer as a flag to throw away | |
170 | * incoming buffers, & postpone dev_remove_pack() to eth_media_stop() on exit. | |
171 | */ | |
172 | ||
173 | static void disable_bearer(struct tipc_bearer *tb_ptr) | |
174 | { | |
175 | ((struct eth_bearer *)tb_ptr->usr_handle)->bearer = 0; | |
176 | } | |
177 | ||
178 | /** | |
179 | * recv_notification - handle device updates from OS | |
180 | * | |
181 | * Change the state of the Ethernet bearer (if any) associated with the | |
182 | * specified device. | |
183 | */ | |
184 | ||
185 | static int recv_notification(struct notifier_block *nb, unsigned long evt, | |
186 | void *dv) | |
187 | { | |
188 | struct net_device *dev = (struct net_device *)dv; | |
189 | struct eth_bearer *eb_ptr = ð_bearers[0]; | |
190 | struct eth_bearer *stop = ð_bearers[MAX_ETH_BEARERS]; | |
191 | ||
192 | while ((eb_ptr->dev != dev)) { | |
193 | if (++eb_ptr == stop) | |
194 | return NOTIFY_DONE; /* couldn't find device */ | |
195 | } | |
196 | if (!eb_ptr->bearer) | |
197 | return NOTIFY_DONE; /* bearer had been disabled */ | |
198 | ||
199 | eb_ptr->bearer->mtu = dev->mtu; | |
200 | ||
201 | switch (evt) { | |
202 | case NETDEV_CHANGE: | |
203 | if (netif_carrier_ok(dev)) | |
204 | tipc_continue(eb_ptr->bearer); | |
205 | else | |
206 | tipc_block_bearer(eb_ptr->bearer->name); | |
207 | break; | |
208 | case NETDEV_UP: | |
209 | tipc_continue(eb_ptr->bearer); | |
210 | break; | |
211 | case NETDEV_DOWN: | |
212 | tipc_block_bearer(eb_ptr->bearer->name); | |
213 | break; | |
214 | case NETDEV_CHANGEMTU: | |
215 | case NETDEV_CHANGEADDR: | |
216 | tipc_block_bearer(eb_ptr->bearer->name); | |
217 | tipc_continue(eb_ptr->bearer); | |
218 | break; | |
219 | case NETDEV_UNREGISTER: | |
220 | case NETDEV_CHANGENAME: | |
221 | tipc_disable_bearer(eb_ptr->bearer->name); | |
222 | break; | |
223 | } | |
224 | return NOTIFY_OK; | |
225 | } | |
226 | ||
227 | /** | |
228 | * eth_addr2str - convert Ethernet address to string | |
229 | */ | |
230 | ||
231 | static char *eth_addr2str(struct tipc_media_addr *a, char *str_buf, int str_size) | |
232 | { | |
233 | unchar *addr = (unchar *)&a->dev_addr; | |
234 | ||
235 | if (str_size < 18) | |
236 | *str_buf = '\0'; | |
237 | else | |
238 | sprintf(str_buf, "%02x:%02x:%02x:%02x:%02x:%02x", | |
239 | addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]); | |
240 | return str_buf; | |
241 | } | |
242 | ||
243 | /** | |
244 | * eth_media_start - activate Ethernet bearer support | |
245 | * | |
246 | * Register Ethernet media type with TIPC bearer code. Also register | |
247 | * with OS for notifications about device state changes. | |
248 | */ | |
249 | ||
250 | int eth_media_start(void) | |
251 | { | |
252 | struct tipc_media_addr bcast_addr; | |
253 | int res; | |
254 | ||
255 | if (eth_started) | |
256 | return -EINVAL; | |
257 | ||
258 | memset(&bcast_addr, 0xff, sizeof(bcast_addr)); | |
259 | memset(eth_bearers, 0, sizeof(eth_bearers)); | |
260 | ||
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, TIPC_DEF_LINK_WIN); | |
265 | if (res) | |
266 | return res; | |
267 | ||
268 | notifier.notifier_call = &recv_notification; | |
269 | notifier.priority = 0; | |
270 | res = register_netdevice_notifier(¬ifier); | |
271 | if (!res) | |
272 | eth_started = 1; | |
273 | return res; | |
274 | } | |
275 | ||
276 | /** | |
277 | * eth_media_stop - deactivate Ethernet bearer support | |
278 | */ | |
279 | ||
280 | void eth_media_stop(void) | |
281 | { | |
282 | int i; | |
283 | ||
284 | if (!eth_started) | |
285 | return; | |
286 | ||
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 = 0; | |
292 | } | |
293 | if (eth_bearers[i].dev) { | |
294 | dev_remove_pack(ð_bearers[i].tipc_packet_type); | |
295 | dev_put(eth_bearers[i].dev); | |
296 | } | |
297 | } | |
298 | memset(ð_bearers, 0, sizeof(eth_bearers)); | |
299 | eth_started = 0; | |
300 | } |