Commit | Line | Data |
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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 |
16cb4b33 | 41 | #define ETH_LINK_PRIORITY TIPC_DEF_LINK_PRI |
b97bf3fd | 42 | #define ETH_LINK_TOLERANCE TIPC_DEF_LINK_TOL |
16cb4b33 | 43 | #define ETH_LINK_WINDOW TIPC_DEF_LINK_WIN |
b97bf3fd PL |
44 | |
45 | /** | |
46 | * struct eth_bearer - Ethernet bearer data structure | |
47 | * @bearer: ptr to associated "generic" bearer structure | |
48 | * @dev: ptr to associated Ethernet network device | |
49 | * @tipc_packet_type: used in binding TIPC to Ethernet driver | |
50 | */ | |
c4307285 | 51 | |
b97bf3fd PL |
52 | struct eth_bearer { |
53 | struct tipc_bearer *bearer; | |
54 | struct net_device *dev; | |
55 | struct packet_type tipc_packet_type; | |
56 | }; | |
57 | ||
58 | static struct eth_bearer eth_bearers[MAX_ETH_BEARERS]; | |
e3ec9c7d | 59 | static int eth_started; |
b97bf3fd PL |
60 | static struct notifier_block notifier; |
61 | ||
62 | /** | |
c4307285 | 63 | * send_msg - send a TIPC message out over an Ethernet interface |
b97bf3fd PL |
64 | */ |
65 | ||
c4307285 | 66 | static int send_msg(struct sk_buff *buf, struct tipc_bearer *tb_ptr, |
b97bf3fd PL |
67 | struct tipc_media_addr *dest) |
68 | { | |
69 | struct sk_buff *clone; | |
70 | struct net_device *dev; | |
9fbfca01 | 71 | int delta; |
b97bf3fd PL |
72 | |
73 | clone = skb_clone(buf, GFP_ATOMIC); | |
9fbfca01 AS |
74 | if (!clone) |
75 | return 0; | |
76 | ||
77 | dev = ((struct eth_bearer *)(tb_ptr->usr_handle))->dev; | |
78 | delta = dev->hard_header_len - skb_headroom(buf); | |
79 | ||
80 | if ((delta > 0) && | |
81 | pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) { | |
82 | kfree_skb(clone); | |
83 | return 0; | |
b97bf3fd | 84 | } |
9fbfca01 AS |
85 | |
86 | skb_reset_network_header(clone); | |
87 | clone->dev = dev; | |
88 | dev_hard_header(clone, dev, ETH_P_TIPC, &dest->dev_addr.eth_addr, | |
89 | dev->dev_addr, clone->len); | |
90 | dev_queue_xmit(clone); | |
0e35fd5e | 91 | return 0; |
b97bf3fd PL |
92 | } |
93 | ||
94 | /** | |
95 | * recv_msg - handle incoming TIPC message from an Ethernet interface | |
c4307285 | 96 | * |
f3ec75f6 AS |
97 | * Accept only packets explicitly sent to this node, or broadcast packets; |
98 | * ignores packets sent using Ethernet multicast, and traffic sent to other | |
99 | * nodes (which can happen if interface is running in promiscuous mode). | |
b97bf3fd PL |
100 | */ |
101 | ||
c4307285 | 102 | static int recv_msg(struct sk_buff *buf, struct net_device *dev, |
b97bf3fd PL |
103 | struct packet_type *pt, struct net_device *orig_dev) |
104 | { | |
105 | struct eth_bearer *eb_ptr = (struct eth_bearer *)pt->af_packet_priv; | |
b97bf3fd | 106 | |
721499e8 | 107 | if (!net_eq(dev_net(dev), &init_net)) { |
e730c155 EB |
108 | kfree_skb(buf); |
109 | return 0; | |
110 | } | |
111 | ||
b97bf3fd | 112 | if (likely(eb_ptr->bearer)) { |
f3ec75f6 | 113 | if (likely(buf->pkt_type <= PACKET_BROADCAST)) { |
b2abd4c0 PG |
114 | buf->next = NULL; |
115 | tipc_recv_msg(buf, eb_ptr->bearer); | |
116 | return 0; | |
b97bf3fd | 117 | } |
b97bf3fd | 118 | } |
5e3c8854 | 119 | kfree_skb(buf); |
0e35fd5e | 120 | return 0; |
b97bf3fd PL |
121 | } |
122 | ||
123 | /** | |
c4307285 | 124 | * enable_bearer - attach TIPC bearer to an Ethernet interface |
b97bf3fd PL |
125 | */ |
126 | ||
127 | static int enable_bearer(struct tipc_bearer *tb_ptr) | |
128 | { | |
cb283ead JPM |
129 | struct net_device *dev = NULL; |
130 | struct net_device *pdev = NULL; | |
b97bf3fd PL |
131 | struct eth_bearer *eb_ptr = ð_bearers[0]; |
132 | struct eth_bearer *stop = ð_bearers[MAX_ETH_BEARERS]; | |
133 | char *driver_name = strchr((const char *)tb_ptr->name, ':') + 1; | |
d1fb6279 AS |
134 | int pending_dev = 0; |
135 | ||
136 | /* Find unused Ethernet bearer structure */ | |
137 | ||
138 | while (eb_ptr->dev) { | |
139 | if (!eb_ptr->bearer) | |
140 | pending_dev++; | |
141 | if (++eb_ptr == stop) | |
142 | return pending_dev ? -EAGAIN : -EDQUOT; | |
143 | } | |
b97bf3fd PL |
144 | |
145 | /* Find device with specified name */ | |
cb283ead | 146 | |
bcd326e8 | 147 | read_lock(&dev_base_lock); |
0e65967e | 148 | for_each_netdev(&init_net, pdev) { |
cb283ead | 149 | if (!strncmp(pdev->name, driver_name, IFNAMSIZ)) { |
7562f876 | 150 | dev = pdev; |
bcd326e8 | 151 | dev_hold(dev); |
7562f876 PE |
152 | break; |
153 | } | |
cb283ead | 154 | } |
bcd326e8 | 155 | read_unlock(&dev_base_lock); |
b97bf3fd PL |
156 | if (!dev) |
157 | return -ENODEV; | |
158 | ||
18abf0fb AS |
159 | /* Create Ethernet bearer for device */ |
160 | ||
161 | eb_ptr->dev = dev; | |
162 | eb_ptr->tipc_packet_type.type = htons(ETH_P_TIPC); | |
163 | eb_ptr->tipc_packet_type.dev = dev; | |
164 | eb_ptr->tipc_packet_type.func = recv_msg; | |
165 | eb_ptr->tipc_packet_type.af_packet_priv = eb_ptr; | |
166 | INIT_LIST_HEAD(&(eb_ptr->tipc_packet_type.list)); | |
167 | dev_add_pack(&eb_ptr->tipc_packet_type); | |
b97bf3fd PL |
168 | |
169 | /* Associate TIPC bearer with Ethernet bearer */ | |
170 | ||
171 | eb_ptr->bearer = tb_ptr; | |
172 | tb_ptr->usr_handle = (void *)eb_ptr; | |
173 | tb_ptr->mtu = dev->mtu; | |
c4307285 | 174 | tb_ptr->blocked = 0; |
b97bf3fd | 175 | tb_ptr->addr.type = htonl(TIPC_MEDIA_TYPE_ETH); |
3a6d54c5 | 176 | memcpy(&tb_ptr->addr.dev_addr, dev->dev_addr, ETH_ALEN); |
b97bf3fd PL |
177 | return 0; |
178 | } | |
179 | ||
180 | /** | |
c4307285 | 181 | * disable_bearer - detach TIPC bearer from an Ethernet interface |
b97bf3fd PL |
182 | * |
183 | * We really should do dev_remove_pack() here, but this function can not be | |
184 | * called at tasklet level. => Use eth_bearer->bearer as a flag to throw away | |
185 | * incoming buffers, & postpone dev_remove_pack() to eth_media_stop() on exit. | |
186 | */ | |
187 | ||
188 | static void disable_bearer(struct tipc_bearer *tb_ptr) | |
189 | { | |
1fc54d8f | 190 | ((struct eth_bearer *)tb_ptr->usr_handle)->bearer = NULL; |
b97bf3fd PL |
191 | } |
192 | ||
193 | /** | |
194 | * recv_notification - handle device updates from OS | |
195 | * | |
c4307285 | 196 | * Change the state of the Ethernet bearer (if any) associated with the |
b97bf3fd PL |
197 | * specified device. |
198 | */ | |
199 | ||
c4307285 | 200 | static int recv_notification(struct notifier_block *nb, unsigned long evt, |
b97bf3fd PL |
201 | void *dv) |
202 | { | |
203 | struct net_device *dev = (struct net_device *)dv; | |
204 | struct eth_bearer *eb_ptr = ð_bearers[0]; | |
205 | struct eth_bearer *stop = ð_bearers[MAX_ETH_BEARERS]; | |
206 | ||
721499e8 | 207 | if (!net_eq(dev_net(dev), &init_net)) |
e9dc8653 EB |
208 | return NOTIFY_DONE; |
209 | ||
b97bf3fd PL |
210 | while ((eb_ptr->dev != dev)) { |
211 | if (++eb_ptr == stop) | |
212 | return NOTIFY_DONE; /* couldn't find device */ | |
213 | } | |
214 | if (!eb_ptr->bearer) | |
215 | return NOTIFY_DONE; /* bearer had been disabled */ | |
216 | ||
c4307285 | 217 | eb_ptr->bearer->mtu = dev->mtu; |
b97bf3fd PL |
218 | |
219 | switch (evt) { | |
220 | case NETDEV_CHANGE: | |
221 | if (netif_carrier_ok(dev)) | |
222 | tipc_continue(eb_ptr->bearer); | |
223 | else | |
224 | tipc_block_bearer(eb_ptr->bearer->name); | |
225 | break; | |
226 | case NETDEV_UP: | |
227 | tipc_continue(eb_ptr->bearer); | |
228 | break; | |
229 | case NETDEV_DOWN: | |
230 | tipc_block_bearer(eb_ptr->bearer->name); | |
231 | break; | |
232 | case NETDEV_CHANGEMTU: | |
c4307285 | 233 | case NETDEV_CHANGEADDR: |
b97bf3fd | 234 | tipc_block_bearer(eb_ptr->bearer->name); |
c4307285 | 235 | tipc_continue(eb_ptr->bearer); |
b97bf3fd PL |
236 | break; |
237 | case NETDEV_UNREGISTER: | |
c4307285 | 238 | case NETDEV_CHANGENAME: |
b97bf3fd PL |
239 | tipc_disable_bearer(eb_ptr->bearer->name); |
240 | break; | |
241 | } | |
242 | return NOTIFY_OK; | |
243 | } | |
244 | ||
245 | /** | |
246 | * eth_addr2str - convert Ethernet address to string | |
247 | */ | |
248 | ||
249 | static char *eth_addr2str(struct tipc_media_addr *a, char *str_buf, int str_size) | |
c4307285 | 250 | { |
b97bf3fd PL |
251 | unchar *addr = (unchar *)&a->dev_addr; |
252 | ||
253 | if (str_size < 18) | |
254 | *str_buf = '\0'; | |
255 | else | |
e174961c | 256 | sprintf(str_buf, "%pM", addr); |
b97bf3fd PL |
257 | return str_buf; |
258 | } | |
259 | ||
260 | /** | |
4323add6 | 261 | * tipc_eth_media_start - activate Ethernet bearer support |
b97bf3fd PL |
262 | * |
263 | * Register Ethernet media type with TIPC bearer code. Also register | |
264 | * with OS for notifications about device state changes. | |
265 | */ | |
266 | ||
4323add6 | 267 | int tipc_eth_media_start(void) |
c4307285 | 268 | { |
b97bf3fd PL |
269 | struct tipc_media_addr bcast_addr; |
270 | int res; | |
271 | ||
272 | if (eth_started) | |
273 | return -EINVAL; | |
274 | ||
49384507 AS |
275 | bcast_addr.type = htonl(TIPC_MEDIA_TYPE_ETH); |
276 | memset(&bcast_addr.dev_addr, 0xff, ETH_ALEN); | |
277 | ||
b97bf3fd PL |
278 | memset(eth_bearers, 0, sizeof(eth_bearers)); |
279 | ||
280 | res = tipc_register_media(TIPC_MEDIA_TYPE_ETH, "eth", | |
c4307285 YH |
281 | enable_bearer, disable_bearer, send_msg, |
282 | eth_addr2str, &bcast_addr, ETH_LINK_PRIORITY, | |
16cb4b33 | 283 | ETH_LINK_TOLERANCE, ETH_LINK_WINDOW); |
b97bf3fd PL |
284 | if (res) |
285 | return res; | |
286 | ||
287 | notifier.notifier_call = &recv_notification; | |
288 | notifier.priority = 0; | |
289 | res = register_netdevice_notifier(¬ifier); | |
290 | if (!res) | |
291 | eth_started = 1; | |
292 | return res; | |
293 | } | |
294 | ||
295 | /** | |
4323add6 | 296 | * tipc_eth_media_stop - deactivate Ethernet bearer support |
b97bf3fd PL |
297 | */ |
298 | ||
4323add6 | 299 | void tipc_eth_media_stop(void) |
b97bf3fd PL |
300 | { |
301 | int i; | |
302 | ||
303 | if (!eth_started) | |
304 | return; | |
305 | ||
306 | unregister_netdevice_notifier(¬ifier); | |
307 | for (i = 0; i < MAX_ETH_BEARERS ; i++) { | |
308 | if (eth_bearers[i].bearer) { | |
309 | eth_bearers[i].bearer->blocked = 1; | |
1fc54d8f | 310 | eth_bearers[i].bearer = NULL; |
b97bf3fd PL |
311 | } |
312 | if (eth_bearers[i].dev) { | |
313 | dev_remove_pack(ð_bearers[i].tipc_packet_type); | |
314 | dev_put(eth_bearers[i].dev); | |
315 | } | |
316 | } | |
317 | memset(ð_bearers, 0, sizeof(eth_bearers)); | |
318 | eth_started = 0; | |
319 | } |