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b97bf3fd PL |
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 | * | |
9 | * Redistribution and use in source and binary forms, with or without | |
10 | * modification, are permitted provided that the following conditions are met: | |
11 | * | |
12 | * Redistributions of source code must retain the above copyright notice, this | |
13 | * list of conditions and the following disclaimer. | |
14 | * Redistributions in binary form must reproduce the above copyright notice, | |
15 | * this list of conditions and the following disclaimer in the documentation | |
16 | * and/or other materials provided with the distribution. | |
17 | * Neither the names of the copyright holders nor the names of its | |
18 | * contributors may be used to endorse or promote products derived from this | |
19 | * software without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
22 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
25 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
26 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
27 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
28 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
29 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
30 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
31 | * POSSIBILITY OF SUCH DAMAGE. | |
32 | */ | |
33 | ||
34 | #include <net/tipc/tipc.h> | |
35 | #include <net/tipc/tipc_bearer.h> | |
36 | #include <net/tipc/tipc_msg.h> | |
37 | #include <linux/netdevice.h> | |
38 | #include <linux/version.h> | |
39 | ||
40 | #define MAX_ETH_BEARERS 2 | |
41 | #define TIPC_PROTOCOL 0x88ca | |
42 | #define ETH_LINK_PRIORITY 10 | |
43 | #define ETH_LINK_TOLERANCE TIPC_DEF_LINK_TOL | |
44 | ||
45 | ||
46 | /** | |
47 | * struct eth_bearer - Ethernet bearer data structure | |
48 | * @bearer: ptr to associated "generic" bearer structure | |
49 | * @dev: ptr to associated Ethernet network device | |
50 | * @tipc_packet_type: used in binding TIPC to Ethernet driver | |
51 | */ | |
52 | ||
53 | struct eth_bearer { | |
54 | struct tipc_bearer *bearer; | |
55 | struct net_device *dev; | |
56 | struct packet_type tipc_packet_type; | |
57 | }; | |
58 | ||
59 | static struct eth_bearer eth_bearers[MAX_ETH_BEARERS]; | |
60 | static int eth_started = 0; | |
61 | static struct notifier_block notifier; | |
62 | ||
63 | /** | |
64 | * send_msg - send a TIPC message out over an Ethernet interface | |
65 | */ | |
66 | ||
67 | static int send_msg(struct sk_buff *buf, struct tipc_bearer *tb_ptr, | |
68 | struct tipc_media_addr *dest) | |
69 | { | |
70 | struct sk_buff *clone; | |
71 | struct net_device *dev; | |
72 | ||
73 | clone = skb_clone(buf, GFP_ATOMIC); | |
74 | if (clone) { | |
75 | clone->nh.raw = clone->data; | |
76 | dev = ((struct eth_bearer *)(tb_ptr->usr_handle))->dev; | |
77 | clone->dev = dev; | |
78 | dev->hard_header(clone, dev, TIPC_PROTOCOL, | |
79 | &dest->dev_addr.eth_addr, | |
80 | dev->dev_addr, clone->len); | |
81 | dev_queue_xmit(clone); | |
82 | } | |
83 | return TIPC_OK; | |
84 | } | |
85 | ||
86 | /** | |
87 | * recv_msg - handle incoming TIPC message from an Ethernet interface | |
88 | * | |
89 | * Routine truncates any Ethernet padding/CRC appended to the message, | |
90 | * and ensures message size matches actual length | |
91 | */ | |
92 | ||
93 | static int recv_msg(struct sk_buff *buf, struct net_device *dev, | |
94 | struct packet_type *pt, struct net_device *orig_dev) | |
95 | { | |
96 | struct eth_bearer *eb_ptr = (struct eth_bearer *)pt->af_packet_priv; | |
97 | u32 size; | |
98 | ||
99 | if (likely(eb_ptr->bearer)) { | |
100 | size = msg_size((struct tipc_msg *)buf->data); | |
101 | skb_trim(buf, size); | |
102 | if (likely(buf->len == size)) { | |
103 | buf->next = NULL; | |
104 | tipc_recv_msg(buf, eb_ptr->bearer); | |
105 | } else { | |
106 | kfree_skb(buf); | |
107 | } | |
108 | } else { | |
109 | kfree_skb(buf); | |
110 | } | |
111 | return TIPC_OK; | |
112 | } | |
113 | ||
114 | /** | |
115 | * enable_bearer - attach TIPC bearer to an Ethernet interface | |
116 | */ | |
117 | ||
118 | static int enable_bearer(struct tipc_bearer *tb_ptr) | |
119 | { | |
120 | struct net_device *dev = dev_base; | |
121 | struct eth_bearer *eb_ptr = ð_bearers[0]; | |
122 | struct eth_bearer *stop = ð_bearers[MAX_ETH_BEARERS]; | |
123 | char *driver_name = strchr((const char *)tb_ptr->name, ':') + 1; | |
124 | ||
125 | /* Find device with specified name */ | |
126 | ||
127 | while (dev && dev->name && | |
128 | (memcmp(dev->name, driver_name, strlen(dev->name)))) { | |
129 | dev = dev->next; | |
130 | } | |
131 | if (!dev) | |
132 | return -ENODEV; | |
133 | ||
134 | /* Find Ethernet bearer for device (or create one) */ | |
135 | ||
136 | for (;(eb_ptr != stop) && eb_ptr->dev && (eb_ptr->dev != dev); eb_ptr++); | |
137 | if (eb_ptr == stop) | |
138 | return -EDQUOT; | |
139 | if (!eb_ptr->dev) { | |
140 | eb_ptr->dev = dev; | |
141 | eb_ptr->tipc_packet_type.type = __constant_htons(TIPC_PROTOCOL); | |
142 | eb_ptr->tipc_packet_type.dev = dev; | |
143 | eb_ptr->tipc_packet_type.func = recv_msg; | |
144 | eb_ptr->tipc_packet_type.af_packet_priv = eb_ptr; | |
145 | INIT_LIST_HEAD(&(eb_ptr->tipc_packet_type.list)); | |
146 | dev_hold(dev); | |
147 | dev_add_pack(&eb_ptr->tipc_packet_type); | |
148 | } | |
149 | ||
150 | /* Associate TIPC bearer with Ethernet bearer */ | |
151 | ||
152 | eb_ptr->bearer = tb_ptr; | |
153 | tb_ptr->usr_handle = (void *)eb_ptr; | |
154 | tb_ptr->mtu = dev->mtu; | |
155 | tb_ptr->blocked = 0; | |
156 | tb_ptr->addr.type = htonl(TIPC_MEDIA_TYPE_ETH); | |
157 | memcpy(&tb_ptr->addr.dev_addr, &dev->dev_addr, ETH_ALEN); | |
158 | return 0; | |
159 | } | |
160 | ||
161 | /** | |
162 | * disable_bearer - detach TIPC bearer from an Ethernet interface | |
163 | * | |
164 | * We really should do dev_remove_pack() here, but this function can not be | |
165 | * called at tasklet level. => Use eth_bearer->bearer as a flag to throw away | |
166 | * incoming buffers, & postpone dev_remove_pack() to eth_media_stop() on exit. | |
167 | */ | |
168 | ||
169 | static void disable_bearer(struct tipc_bearer *tb_ptr) | |
170 | { | |
171 | ((struct eth_bearer *)tb_ptr->usr_handle)->bearer = 0; | |
172 | } | |
173 | ||
174 | /** | |
175 | * recv_notification - handle device updates from OS | |
176 | * | |
177 | * Change the state of the Ethernet bearer (if any) associated with the | |
178 | * specified device. | |
179 | */ | |
180 | ||
181 | static int recv_notification(struct notifier_block *nb, unsigned long evt, | |
182 | void *dv) | |
183 | { | |
184 | struct net_device *dev = (struct net_device *)dv; | |
185 | struct eth_bearer *eb_ptr = ð_bearers[0]; | |
186 | struct eth_bearer *stop = ð_bearers[MAX_ETH_BEARERS]; | |
187 | ||
188 | while ((eb_ptr->dev != dev)) { | |
189 | if (++eb_ptr == stop) | |
190 | return NOTIFY_DONE; /* couldn't find device */ | |
191 | } | |
192 | if (!eb_ptr->bearer) | |
193 | return NOTIFY_DONE; /* bearer had been disabled */ | |
194 | ||
195 | eb_ptr->bearer->mtu = dev->mtu; | |
196 | ||
197 | switch (evt) { | |
198 | case NETDEV_CHANGE: | |
199 | if (netif_carrier_ok(dev)) | |
200 | tipc_continue(eb_ptr->bearer); | |
201 | else | |
202 | tipc_block_bearer(eb_ptr->bearer->name); | |
203 | break; | |
204 | case NETDEV_UP: | |
205 | tipc_continue(eb_ptr->bearer); | |
206 | break; | |
207 | case NETDEV_DOWN: | |
208 | tipc_block_bearer(eb_ptr->bearer->name); | |
209 | break; | |
210 | case NETDEV_CHANGEMTU: | |
211 | case NETDEV_CHANGEADDR: | |
212 | tipc_block_bearer(eb_ptr->bearer->name); | |
213 | tipc_continue(eb_ptr->bearer); | |
214 | break; | |
215 | case NETDEV_UNREGISTER: | |
216 | case NETDEV_CHANGENAME: | |
217 | tipc_disable_bearer(eb_ptr->bearer->name); | |
218 | break; | |
219 | } | |
220 | return NOTIFY_OK; | |
221 | } | |
222 | ||
223 | /** | |
224 | * eth_addr2str - convert Ethernet address to string | |
225 | */ | |
226 | ||
227 | static char *eth_addr2str(struct tipc_media_addr *a, char *str_buf, int str_size) | |
228 | { | |
229 | unchar *addr = (unchar *)&a->dev_addr; | |
230 | ||
231 | if (str_size < 18) | |
232 | *str_buf = '\0'; | |
233 | else | |
234 | sprintf(str_buf, "%02x:%02x:%02x:%02x:%02x:%02x", | |
235 | addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]); | |
236 | return str_buf; | |
237 | } | |
238 | ||
239 | /** | |
240 | * eth_media_start - activate Ethernet bearer support | |
241 | * | |
242 | * Register Ethernet media type with TIPC bearer code. Also register | |
243 | * with OS for notifications about device state changes. | |
244 | */ | |
245 | ||
246 | int eth_media_start(void) | |
247 | { | |
248 | struct tipc_media_addr bcast_addr; | |
249 | int res; | |
250 | ||
251 | if (eth_started) | |
252 | return -EINVAL; | |
253 | ||
254 | memset(&bcast_addr, 0xff, sizeof(bcast_addr)); | |
255 | memset(eth_bearers, 0, sizeof(eth_bearers)); | |
256 | ||
257 | res = tipc_register_media(TIPC_MEDIA_TYPE_ETH, "eth", | |
258 | enable_bearer, disable_bearer, send_msg, | |
259 | eth_addr2str, &bcast_addr, ETH_LINK_PRIORITY, | |
260 | ETH_LINK_TOLERANCE, TIPC_DEF_LINK_WIN); | |
261 | if (res) | |
262 | return res; | |
263 | ||
264 | notifier.notifier_call = &recv_notification; | |
265 | notifier.priority = 0; | |
266 | res = register_netdevice_notifier(¬ifier); | |
267 | if (!res) | |
268 | eth_started = 1; | |
269 | return res; | |
270 | } | |
271 | ||
272 | /** | |
273 | * eth_media_stop - deactivate Ethernet bearer support | |
274 | */ | |
275 | ||
276 | void eth_media_stop(void) | |
277 | { | |
278 | int i; | |
279 | ||
280 | if (!eth_started) | |
281 | return; | |
282 | ||
283 | unregister_netdevice_notifier(¬ifier); | |
284 | for (i = 0; i < MAX_ETH_BEARERS ; i++) { | |
285 | if (eth_bearers[i].bearer) { | |
286 | eth_bearers[i].bearer->blocked = 1; | |
287 | eth_bearers[i].bearer = 0; | |
288 | } | |
289 | if (eth_bearers[i].dev) { | |
290 | dev_remove_pack(ð_bearers[i].tipc_packet_type); | |
291 | dev_put(eth_bearers[i].dev); | |
292 | } | |
293 | } | |
294 | memset(ð_bearers, 0, sizeof(eth_bearers)); | |
295 | eth_started = 0; | |
296 | } |