tcp: shrink tcp6_timewait_sock by one cache line
[kernel/kernel-generic.git] / net / mac802154 / monitor.c
1 /*
2  * Copyright 2007, 2008, 2009 Siemens AG
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License version 2
6  * as published by the Free Software Foundation.
7  *
8  * This program is distributed in the hope that it will be useful,
9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11  * GNU General Public License for more details.
12  *
13  * You should have received a copy of the GNU General Public License along
14  * with this program; if not, write to the Free Software Foundation, Inc.,
15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16  *
17  * Written by:
18  * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
19  * Sergey Lapin <slapin@ossfans.org>
20  * Maxim Gorbachyov <maxim.gorbachev@siemens.com>
21  * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
22  */
23
24 #include <linux/netdevice.h>
25 #include <linux/skbuff.h>
26 #include <linux/if_arp.h>
27 #include <linux/crc-ccitt.h>
28
29 #include <net/ieee802154.h>
30 #include <net/mac802154.h>
31 #include <net/netlink.h>
32 #include <net/wpan-phy.h>
33 #include <linux/nl802154.h>
34
35 #include "mac802154.h"
36
37 static netdev_tx_t mac802154_monitor_xmit(struct sk_buff *skb,
38                                           struct net_device *dev)
39 {
40         struct mac802154_sub_if_data *priv;
41         u8 chan, page;
42
43         priv = netdev_priv(dev);
44
45         /* FIXME: locking */
46         chan = priv->hw->phy->current_channel;
47         page = priv->hw->phy->current_page;
48
49         if (chan == MAC802154_CHAN_NONE) /* not initialized */
50                 return NETDEV_TX_OK;
51
52         if (WARN_ON(page >= WPAN_NUM_PAGES) ||
53             WARN_ON(chan >= WPAN_NUM_CHANNELS))
54                 return NETDEV_TX_OK;
55
56         skb->skb_iif = dev->ifindex;
57         dev->stats.tx_packets++;
58         dev->stats.tx_bytes += skb->len;
59
60         return mac802154_tx(priv->hw, skb, page, chan);
61 }
62
63
64 void mac802154_monitors_rx(struct mac802154_priv *priv, struct sk_buff *skb)
65 {
66         struct sk_buff *skb2;
67         struct mac802154_sub_if_data *sdata;
68         u16 crc = crc_ccitt(0, skb->data, skb->len);
69         u8 *data;
70
71         rcu_read_lock();
72         list_for_each_entry_rcu(sdata, &priv->slaves, list) {
73                 if (sdata->type != IEEE802154_DEV_MONITOR)
74                         continue;
75
76                 skb2 = skb_clone(skb, GFP_ATOMIC);
77                 skb2->dev = sdata->dev;
78                 skb2->pkt_type = PACKET_HOST;
79                 data = skb_put(skb2, 2);
80                 data[0] = crc & 0xff;
81                 data[1] = crc >> 8;
82
83                 netif_rx_ni(skb2);
84         }
85         rcu_read_unlock();
86 }
87
88 static const struct net_device_ops mac802154_monitor_ops = {
89         .ndo_open               = mac802154_slave_open,
90         .ndo_stop               = mac802154_slave_close,
91         .ndo_start_xmit         = mac802154_monitor_xmit,
92 };
93
94 void mac802154_monitor_setup(struct net_device *dev)
95 {
96         struct mac802154_sub_if_data *priv;
97
98         dev->addr_len           = 0;
99         dev->hard_header_len    = 0;
100         dev->needed_tailroom    = 2; /* room for FCS */
101         dev->mtu                = IEEE802154_MTU;
102         dev->tx_queue_len       = 10;
103         dev->type               = ARPHRD_IEEE802154_MONITOR;
104         dev->flags              = IFF_NOARP | IFF_BROADCAST;
105         dev->watchdog_timeo     = 0;
106
107         dev->destructor         = free_netdev;
108         dev->netdev_ops         = &mac802154_monitor_ops;
109         dev->ml_priv            = &mac802154_mlme_reduced;
110
111         priv = netdev_priv(dev);
112         priv->type = IEEE802154_DEV_MONITOR;
113
114         priv->chan = MAC802154_CHAN_NONE; /* not initialized */
115         priv->page = 0;
116 }