Commit | Line | Data |
---|---|---|
b97bf3fd PL |
1 | /* |
2 | * net/tipc/eth_media.c: Ethernet bearer support for TIPC | |
c4307285 | 3 | * |
f3ec75f6 | 4 | * Copyright (c) 2001-2007, Ericsson AB |
bcd326e8 | 5 | * Copyright (c) 2005-2008, 2011, Wind River Systems |
b97bf3fd PL |
6 | * All rights reserved. |
7 | * | |
9ea1fd3c | 8 | * Redistribution and use in source and binary forms, with or without |
b97bf3fd PL |
9 | * modification, are permitted provided that the following conditions are met: |
10 | * | |
9ea1fd3c PL |
11 | * 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. | |
b97bf3fd | 19 | * |
9ea1fd3c PL |
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. | |
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 | |
b97bf3fd PL |
34 | * POSSIBILITY OF SUCH DAMAGE. |
35 | */ | |
36 | ||
d265fef6 AS |
37 | #include "core.h" |
38 | #include "bearer.h" | |
39 | ||
909234cd | 40 | #define MAX_ETH_BEARERS MAX_BEARERS |
b97bf3fd PL |
41 | |
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 | */ | |
c4307285 | 48 | |
b97bf3fd PL |
49 | struct eth_bearer { |
50 | struct tipc_bearer *bearer; | |
51 | struct net_device *dev; | |
52 | struct packet_type tipc_packet_type; | |
53 | }; | |
54 | ||
55 | static struct eth_bearer eth_bearers[MAX_ETH_BEARERS]; | |
e3ec9c7d | 56 | static int eth_started; |
b97bf3fd PL |
57 | static struct notifier_block notifier; |
58 | ||
59 | /** | |
c4307285 | 60 | * send_msg - send a TIPC message out over an Ethernet interface |
b97bf3fd PL |
61 | */ |
62 | ||
c4307285 | 63 | static int send_msg(struct sk_buff *buf, struct tipc_bearer *tb_ptr, |
b97bf3fd PL |
64 | struct tipc_media_addr *dest) |
65 | { | |
66 | struct sk_buff *clone; | |
67 | struct net_device *dev; | |
9fbfca01 | 68 | int delta; |
b97bf3fd PL |
69 | |
70 | clone = skb_clone(buf, GFP_ATOMIC); | |
9fbfca01 AS |
71 | 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; | |
b97bf3fd | 81 | } |
9fbfca01 AS |
82 | |
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); | |
0e35fd5e | 88 | return 0; |
b97bf3fd PL |
89 | } |
90 | ||
91 | /** | |
92 | * recv_msg - handle incoming TIPC message from an Ethernet interface | |
c4307285 | 93 | * |
f3ec75f6 AS |
94 | * 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). | |
b97bf3fd PL |
97 | */ |
98 | ||
c4307285 | 99 | static int recv_msg(struct sk_buff *buf, struct net_device *dev, |
b97bf3fd PL |
100 | struct packet_type *pt, struct net_device *orig_dev) |
101 | { | |
102 | struct eth_bearer *eb_ptr = (struct eth_bearer *)pt->af_packet_priv; | |
b97bf3fd | 103 | |
721499e8 | 104 | if (!net_eq(dev_net(dev), &init_net)) { |
e730c155 EB |
105 | kfree_skb(buf); |
106 | return 0; | |
107 | } | |
108 | ||
b97bf3fd | 109 | if (likely(eb_ptr->bearer)) { |
f3ec75f6 | 110 | if (likely(buf->pkt_type <= PACKET_BROADCAST)) { |
b2abd4c0 PG |
111 | buf->next = NULL; |
112 | tipc_recv_msg(buf, eb_ptr->bearer); | |
113 | return 0; | |
b97bf3fd | 114 | } |
b97bf3fd | 115 | } |
5e3c8854 | 116 | kfree_skb(buf); |
0e35fd5e | 117 | return 0; |
b97bf3fd PL |
118 | } |
119 | ||
120 | /** | |
c4307285 | 121 | * enable_bearer - attach TIPC bearer to an Ethernet interface |
b97bf3fd PL |
122 | */ |
123 | ||
124 | static int enable_bearer(struct tipc_bearer *tb_ptr) | |
125 | { | |
cb283ead JPM |
126 | struct net_device *dev = NULL; |
127 | struct net_device *pdev = NULL; | |
b97bf3fd PL |
128 | struct eth_bearer *eb_ptr = ð_bearers[0]; |
129 | struct eth_bearer *stop = ð_bearers[MAX_ETH_BEARERS]; | |
130 | char *driver_name = strchr((const char *)tb_ptr->name, ':') + 1; | |
d1fb6279 AS |
131 | 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 | } | |
b97bf3fd PL |
141 | |
142 | /* Find device with specified name */ | |
cb283ead | 143 | |
bcd326e8 | 144 | read_lock(&dev_base_lock); |
0e65967e | 145 | for_each_netdev(&init_net, pdev) { |
cb283ead | 146 | if (!strncmp(pdev->name, driver_name, IFNAMSIZ)) { |
7562f876 | 147 | dev = pdev; |
bcd326e8 | 148 | dev_hold(dev); |
7562f876 PE |
149 | break; |
150 | } | |
cb283ead | 151 | } |
bcd326e8 | 152 | read_unlock(&dev_base_lock); |
b97bf3fd PL |
153 | if (!dev) |
154 | return -ENODEV; | |
155 | ||
18abf0fb AS |
156 | /* Create Ethernet bearer for device */ |
157 | ||
158 | 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); | |
b97bf3fd PL |
165 | |
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; | |
c4307285 | 171 | tb_ptr->blocked = 0; |
b97bf3fd | 172 | tb_ptr->addr.type = htonl(TIPC_MEDIA_TYPE_ETH); |
3a6d54c5 | 173 | memcpy(&tb_ptr->addr.dev_addr, dev->dev_addr, ETH_ALEN); |
b97bf3fd PL |
174 | return 0; |
175 | } | |
176 | ||
177 | /** | |
c4307285 | 178 | * disable_bearer - detach TIPC bearer from an Ethernet interface |
b97bf3fd PL |
179 | * |
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 | ||
185 | static void disable_bearer(struct tipc_bearer *tb_ptr) | |
186 | { | |
1fc54d8f | 187 | ((struct eth_bearer *)tb_ptr->usr_handle)->bearer = NULL; |
b97bf3fd PL |
188 | } |
189 | ||
190 | /** | |
191 | * recv_notification - handle device updates from OS | |
192 | * | |
c4307285 | 193 | * Change the state of the Ethernet bearer (if any) associated with the |
b97bf3fd PL |
194 | * specified device. |
195 | */ | |
196 | ||
c4307285 | 197 | static int recv_notification(struct notifier_block *nb, unsigned long evt, |
b97bf3fd PL |
198 | void *dv) |
199 | { | |
200 | struct net_device *dev = (struct net_device *)dv; | |
201 | struct eth_bearer *eb_ptr = ð_bearers[0]; | |
202 | struct eth_bearer *stop = ð_bearers[MAX_ETH_BEARERS]; | |
203 | ||
721499e8 | 204 | if (!net_eq(dev_net(dev), &init_net)) |
e9dc8653 EB |
205 | return NOTIFY_DONE; |
206 | ||
b97bf3fd PL |
207 | 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 | ||
c4307285 | 214 | eb_ptr->bearer->mtu = dev->mtu; |
b97bf3fd PL |
215 | |
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: | |
c4307285 | 230 | case NETDEV_CHANGEADDR: |
b97bf3fd | 231 | tipc_block_bearer(eb_ptr->bearer->name); |
c4307285 | 232 | tipc_continue(eb_ptr->bearer); |
b97bf3fd PL |
233 | break; |
234 | case NETDEV_UNREGISTER: | |
c4307285 | 235 | case NETDEV_CHANGENAME: |
b97bf3fd PL |
236 | 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 | ||
c61b666e | 246 | static int eth_addr2str(struct tipc_media_addr *a, char *str_buf, int str_size) |
c4307285 | 247 | { |
b97bf3fd PL |
248 | unchar *addr = (unchar *)&a->dev_addr; |
249 | ||
c61b666e AS |
250 | if (str_size < 18) /* 18 = strlen("aa:bb:cc:dd:ee:ff\0") */ |
251 | return 1; | |
252 | ||
253 | sprintf(str_buf, "%pM", addr); | |
254 | return 0; | |
b97bf3fd PL |
255 | } |
256 | ||
706767da AS |
257 | /* |
258 | * Ethernet media registration info | |
259 | */ | |
260 | ||
261 | static 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 | ||
b97bf3fd | 275 | /** |
4323add6 | 276 | * tipc_eth_media_start - activate Ethernet bearer support |
b97bf3fd PL |
277 | * |
278 | * Register Ethernet media type with TIPC bearer code. Also register | |
279 | * with OS for notifications about device state changes. | |
280 | */ | |
281 | ||
4323add6 | 282 | int tipc_eth_media_start(void) |
c4307285 | 283 | { |
b97bf3fd PL |
284 | int res; |
285 | ||
286 | if (eth_started) | |
287 | return -EINVAL; | |
288 | ||
b97bf3fd PL |
289 | memset(eth_bearers, 0, sizeof(eth_bearers)); |
290 | ||
706767da | 291 | res = tipc_register_media(ð_media_info); |
b97bf3fd PL |
292 | if (res) |
293 | return res; | |
294 | ||
295 | notifier.notifier_call = &recv_notification; | |
296 | notifier.priority = 0; | |
297 | res = register_netdevice_notifier(¬ifier); | |
298 | if (!res) | |
299 | eth_started = 1; | |
300 | return res; | |
301 | } | |
302 | ||
303 | /** | |
4323add6 | 304 | * tipc_eth_media_stop - deactivate Ethernet bearer support |
b97bf3fd PL |
305 | */ |
306 | ||
4323add6 | 307 | void tipc_eth_media_stop(void) |
b97bf3fd PL |
308 | { |
309 | int i; | |
310 | ||
311 | if (!eth_started) | |
312 | return; | |
313 | ||
314 | unregister_netdevice_notifier(¬ifier); | |
315 | for (i = 0; i < MAX_ETH_BEARERS ; i++) { | |
316 | if (eth_bearers[i].bearer) { | |
317 | eth_bearers[i].bearer->blocked = 1; | |
1fc54d8f | 318 | eth_bearers[i].bearer = NULL; |
b97bf3fd PL |
319 | } |
320 | if (eth_bearers[i].dev) { | |
321 | dev_remove_pack(ð_bearers[i].tipc_packet_type); | |
322 | dev_put(eth_bearers[i].dev); | |
323 | } | |
324 | } | |
325 | memset(ð_bearers, 0, sizeof(eth_bearers)); | |
326 | eth_started = 0; | |
327 | } |