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[lisovros/linux_canprio.git] / drivers / staging / batman-adv / soft-interface.c
1 /*
2  * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
3  *
4  * Marek Lindner, Simon Wunderlich
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of version 2 of the GNU General Public
8  * License as published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope that it will be useful, but
11  * WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13  * General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program; if not, write to the Free Software
17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
18  * 02110-1301, USA
19  *
20  */
21
22 #include "main.h"
23 #include "soft-interface.h"
24 #include "hard-interface.h"
25 #include "send.h"
26 #include "translation-table.h"
27 #include "types.h"
28 #include "hash.h"
29 #include <linux/slab.h>
30 #include <linux/ethtool.h>
31 #include <linux/etherdevice.h>
32
33 static uint16_t bcast_seqno = 1; /* give own bcast messages seq numbers to avoid
34                                   * broadcast storms */
35 static int32_t skb_packets;
36 static int32_t skb_bad_packets;
37
38 unsigned char mainIfAddr[ETH_ALEN];
39 static unsigned char mainIfAddr_default[ETH_ALEN];
40 static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd);
41 static void bat_get_drvinfo(struct net_device *dev,
42                             struct ethtool_drvinfo *info);
43 static u32 bat_get_msglevel(struct net_device *dev);
44 static void bat_set_msglevel(struct net_device *dev, u32 value);
45 static u32 bat_get_link(struct net_device *dev);
46 static u32 bat_get_rx_csum(struct net_device *dev);
47 static int bat_set_rx_csum(struct net_device *dev, u32 data);
48
49 static const struct ethtool_ops bat_ethtool_ops = {
50         .get_settings = bat_get_settings,
51         .get_drvinfo = bat_get_drvinfo,
52         .get_msglevel = bat_get_msglevel,
53         .set_msglevel = bat_set_msglevel,
54         .get_link = bat_get_link,
55         .get_rx_csum = bat_get_rx_csum,
56         .set_rx_csum = bat_set_rx_csum
57 };
58
59 void set_main_if_addr(uint8_t *addr)
60 {
61         memcpy(mainIfAddr, addr, ETH_ALEN);
62 }
63
64 int main_if_was_up(void)
65 {
66         return (memcmp(mainIfAddr, mainIfAddr_default, ETH_ALEN) != 0 ? 1 : 0);
67 }
68
69 int my_skb_push(struct sk_buff *skb, unsigned int len)
70 {
71         int result = 0;
72
73         skb_packets++;
74         if (skb_headroom(skb) < len) {
75                 skb_bad_packets++;
76                 result = pskb_expand_head(skb, len, 0, GFP_ATOMIC);
77
78                 if (result < 0)
79                         return result;
80         }
81
82         skb_push(skb, len);
83         return 0;
84 }
85
86 #ifdef HAVE_NET_DEVICE_OPS
87 static const struct net_device_ops bat_netdev_ops = {
88         .ndo_open = interface_open,
89         .ndo_stop = interface_release,
90         .ndo_get_stats = interface_stats,
91         .ndo_set_mac_address = interface_set_mac_addr,
92         .ndo_change_mtu = interface_change_mtu,
93         .ndo_start_xmit = interface_tx,
94         .ndo_validate_addr = eth_validate_addr
95 };
96 #endif
97
98 void interface_setup(struct net_device *dev)
99 {
100         struct bat_priv *priv = netdev_priv(dev);
101         char dev_addr[ETH_ALEN];
102
103         ether_setup(dev);
104
105 #ifdef HAVE_NET_DEVICE_OPS
106         dev->netdev_ops = &bat_netdev_ops;
107 #else
108         dev->open = interface_open;
109         dev->stop = interface_release;
110         dev->get_stats = interface_stats;
111         dev->set_mac_address = interface_set_mac_addr;
112         dev->change_mtu = interface_change_mtu;
113         dev->hard_start_xmit = interface_tx;
114 #endif
115         dev->destructor = free_netdev;
116
117         dev->mtu = hardif_min_mtu();
118         dev->hard_header_len = BAT_HEADER_LEN; /* reserve more space in the
119                                                 * skbuff for our header */
120
121         /* generate random address */
122         random_ether_addr(dev_addr);
123         memcpy(dev->dev_addr, dev_addr, ETH_ALEN);
124
125         SET_ETHTOOL_OPS(dev, &bat_ethtool_ops);
126
127         memset(priv, 0, sizeof(struct bat_priv));
128 }
129
130 int interface_open(struct net_device *dev)
131 {
132         netif_start_queue(dev);
133         return 0;
134 }
135
136 int interface_release(struct net_device *dev)
137 {
138         netif_stop_queue(dev);
139         return 0;
140 }
141
142 struct net_device_stats *interface_stats(struct net_device *dev)
143 {
144         struct bat_priv *priv = netdev_priv(dev);
145         return &priv->stats;
146 }
147
148 int interface_set_mac_addr(struct net_device *dev, void *p)
149 {
150         struct sockaddr *addr = p;
151
152         if (!is_valid_ether_addr(addr->sa_data))
153                 return -EADDRNOTAVAIL;
154
155         /* only modify hna-table if it has been initialised before */
156         if (atomic_read(&module_state) == MODULE_ACTIVE) {
157                 hna_local_remove(dev->dev_addr, "mac address changed");
158                 hna_local_add(addr->sa_data);
159         }
160
161         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
162
163         return 0;
164 }
165
166 int interface_change_mtu(struct net_device *dev, int new_mtu)
167 {
168         /* check ranges */
169         if ((new_mtu < 68) || (new_mtu > hardif_min_mtu()))
170                 return -EINVAL;
171
172         dev->mtu = new_mtu;
173
174         return 0;
175 }
176
177 int interface_tx(struct sk_buff *skb, struct net_device *dev)
178 {
179         struct unicast_packet *unicast_packet;
180         struct bcast_packet *bcast_packet;
181         struct orig_node *orig_node;
182         struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
183         struct bat_priv *priv = netdev_priv(dev);
184         struct batman_if *batman_if;
185         struct bat_priv *bat_priv;
186         uint8_t dstaddr[6];
187         int data_len = skb->len;
188         unsigned long flags;
189
190         if (atomic_read(&module_state) != MODULE_ACTIVE)
191                 goto dropped;
192
193         /* FIXME: each batman_if will be attached to a softif */
194         bat_priv = netdev_priv(soft_device);
195
196         dev->trans_start = jiffies;
197         /* TODO: check this for locks */
198         hna_local_add(ethhdr->h_source);
199
200         /* ethernet packet should be broadcasted */
201         if (is_bcast(ethhdr->h_dest) || is_mcast(ethhdr->h_dest)) {
202
203                 if (my_skb_push(skb, sizeof(struct bcast_packet)) < 0)
204                         goto dropped;
205
206                 bcast_packet = (struct bcast_packet *)skb->data;
207                 bcast_packet->version = COMPAT_VERSION;
208
209                 /* batman packet type: broadcast */
210                 bcast_packet->packet_type = BAT_BCAST;
211
212                 /* hw address of first interface is the orig mac because only
213                  * this mac is known throughout the mesh */
214                 memcpy(bcast_packet->orig, mainIfAddr, ETH_ALEN);
215
216                 /* set broadcast sequence number */
217                 bcast_packet->seqno = htons(bcast_seqno);
218
219                 bcast_seqno++;
220
221                 /* broadcast packet */
222                 add_bcast_packet_to_list(skb);
223                 /* a copy is stored in the bcast list, therefore removing
224                  * the original skb. */
225                 kfree_skb(skb);
226
227         /* unicast packet */
228         } else {
229                 spin_lock_irqsave(&orig_hash_lock, flags);
230                 /* get routing information */
231                 orig_node = ((struct orig_node *)hash_find(orig_hash,
232                                                            ethhdr->h_dest));
233
234                 /* check for hna host */
235                 if (!orig_node)
236                         orig_node = transtable_search(ethhdr->h_dest);
237
238                 if ((orig_node) &&
239                     (orig_node->batman_if) &&
240                     (orig_node->router)) {
241                         if (my_skb_push(skb, sizeof(struct unicast_packet)) < 0)
242                                 goto unlock;
243
244                         unicast_packet = (struct unicast_packet *)skb->data;
245
246                         unicast_packet->version = COMPAT_VERSION;
247                         /* batman packet type: unicast */
248                         unicast_packet->packet_type = BAT_UNICAST;
249                         /* set unicast ttl */
250                         unicast_packet->ttl = TTL;
251                         /* copy the destination for faster routing */
252                         memcpy(unicast_packet->dest, orig_node->orig, ETH_ALEN);
253
254                         /* net_dev won't be available when not active */
255                         if (orig_node->batman_if->if_active != IF_ACTIVE)
256                                 goto unlock;
257
258                         /* don't lock while sending the packets ... we therefore
259                          * copy the required data before sending */
260
261                         batman_if = orig_node->batman_if;
262                         memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
263                         spin_unlock_irqrestore(&orig_hash_lock, flags);
264
265                         send_skb_packet(skb, batman_if, dstaddr);
266                 } else {
267                         goto unlock;
268                 }
269         }
270
271         priv->stats.tx_packets++;
272         priv->stats.tx_bytes += data_len;
273         goto end;
274
275 unlock:
276         spin_unlock_irqrestore(&orig_hash_lock, flags);
277 dropped:
278         priv->stats.tx_dropped++;
279 end:
280         return NETDEV_TX_OK;
281 }
282
283 void interface_rx(struct sk_buff *skb, int hdr_size)
284 {
285         struct net_device *dev = soft_device;
286         struct bat_priv *priv = netdev_priv(dev);
287
288         /* check if enough space is available for pulling, and pull */
289         if (!pskb_may_pull(skb, hdr_size)) {
290                 kfree_skb(skb);
291                 return;
292         }
293         skb_pull_rcsum(skb, hdr_size);
294 /*      skb_set_mac_header(skb, -sizeof(struct ethhdr));*/
295
296         skb->dev = dev;
297         skb->protocol = eth_type_trans(skb, dev);
298
299         /* should not be neccesary anymore as we use skb_pull_rcsum()
300          * TODO: please verify this and remove this TODO
301          * -- Dec 21st 2009, Simon Wunderlich */
302
303 /*      skb->ip_summed = CHECKSUM_UNNECESSARY;*/
304
305         /* TODO: set skb->pkt_type to PACKET_BROADCAST, PACKET_MULTICAST,
306          * PACKET_OTHERHOST or PACKET_HOST */
307
308         priv->stats.rx_packets++;
309         priv->stats.rx_bytes += skb->len;
310
311         dev->last_rx = jiffies;
312
313         netif_rx(skb);
314 }
315
316 /* ethtool */
317 static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
318 {
319         cmd->supported = 0;
320         cmd->advertising = 0;
321         cmd->speed = SPEED_10;
322         cmd->duplex = DUPLEX_FULL;
323         cmd->port = PORT_TP;
324         cmd->phy_address = 0;
325         cmd->transceiver = XCVR_INTERNAL;
326         cmd->autoneg = AUTONEG_DISABLE;
327         cmd->maxtxpkt = 0;
328         cmd->maxrxpkt = 0;
329
330         return 0;
331 }
332
333 static void bat_get_drvinfo(struct net_device *dev,
334                             struct ethtool_drvinfo *info)
335 {
336         strcpy(info->driver, "B.A.T.M.A.N. advanced");
337         strcpy(info->version, SOURCE_VERSION);
338         strcpy(info->fw_version, "N/A");
339         strcpy(info->bus_info, "batman");
340 }
341
342 static u32 bat_get_msglevel(struct net_device *dev)
343 {
344         return -EOPNOTSUPP;
345 }
346
347 static void bat_set_msglevel(struct net_device *dev, u32 value)
348 {
349 }
350
351 static u32 bat_get_link(struct net_device *dev)
352 {
353         return 1;
354 }
355
356 static u32 bat_get_rx_csum(struct net_device *dev)
357 {
358         return 0;
359 }
360
361 static int bat_set_rx_csum(struct net_device *dev, u32 data)
362 {
363         return -EOPNOTSUPP;
364 }