2 * Copyright (c) 2012 GCT Semiconductor, Inc. All rights reserved.
4 * This software is licensed under the terms of the GNU General Public
5 * License version 2, as published by the Free Software Foundation, and
6 * may be copied, distributed, and modified under those terms.
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.
14 #include <linux/version.h>
15 #include <linux/module.h>
16 #include <linux/etherdevice.h>
17 #include <linux/netlink.h>
18 #include <asm/byteorder.h>
21 #if !defined(NLMSG_HDRLEN)
22 #define NLMSG_HDRLEN ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))
25 #define ND_MAX_GROUP 30
26 #define ND_IFINDEX_LEN sizeof(int)
27 #define ND_NLMSG_SPACE(len) (NLMSG_SPACE(len) + ND_IFINDEX_LEN)
28 #define ND_NLMSG_DATA(nlh) \
29 ((void *)((char *)NLMSG_DATA(nlh) + ND_IFINDEX_LEN))
30 #define ND_NLMSG_S_LEN(len) (len+ND_IFINDEX_LEN)
31 #define ND_NLMSG_R_LEN(nlh) (nlh->nlmsg_len-ND_IFINDEX_LEN)
32 #define ND_NLMSG_IFIDX(nlh) NLMSG_DATA(nlh)
33 #define ND_MAX_MSG_LEN 8096
35 #if defined(DEFINE_MUTEX)
36 static DEFINE_MUTEX(netlink_mutex
);
38 static struct semaphore netlink_mutex
;
39 #define mutex_lock(x) down(x)
40 #define mutex_unlock(x) up(x)
43 static void (*rcv_cb
)(struct net_device
*dev
, u16 type
, void *msg
, int len
);
45 static void netlink_rcv_cb(struct sk_buff
*skb
)
48 struct net_device
*dev
;
53 if (skb
->len
>= NLMSG_SPACE(0)) {
54 nlh
= (struct nlmsghdr
*)skb
->data
;
56 if (skb
->len
< nlh
->nlmsg_len
||
57 nlh
->nlmsg_len
> ND_MAX_MSG_LEN
) {
58 printk(KERN_ERR
"Invalid length (%d,%d)\n", skb
->len
,
63 memcpy(&ifindex
, ND_NLMSG_IFIDX(nlh
), ND_IFINDEX_LEN
);
64 msg
= ND_NLMSG_DATA(nlh
);
65 mlen
= ND_NLMSG_R_LEN(nlh
);
68 dev
= dev_get_by_index(&init_net
, ifindex
);
70 rcv_cb(dev
, nlh
->nlmsg_type
, msg
, mlen
);
73 printk(KERN_ERR
"dev_get_by_index(%d) "
74 "is not found.\n", ifindex
);
76 printk(KERN_ERR
"Unregistered Callback\n");
80 static void netlink_rcv(struct sk_buff
*skb
)
82 mutex_lock(&netlink_mutex
);
84 mutex_unlock(&netlink_mutex
);
87 struct sock
*netlink_init(int unit
, void (*cb
)(struct net_device
*dev
, u16 type
,
92 #if !defined(DEFINE_MUTEX)
93 init_MUTEX(&netlink_mutex
);
96 sock
= netlink_kernel_create(&init_net
, unit
, 0, netlink_rcv
, NULL
,
105 void netlink_exit(struct sock
*sock
)
107 sock_release(sock
->sk_socket
);
110 int netlink_send(struct sock
*sock
, int group
, u16 type
, void *msg
, int len
)
113 struct sk_buff
*skb
= NULL
;
114 struct nlmsghdr
*nlh
;
117 if (group
> ND_MAX_GROUP
) {
118 printk(KERN_ERR
"Group %d is invalied.\n", group
);
119 printk(KERN_ERR
"Valid group is 0 ~ %d.\n", ND_MAX_GROUP
);
123 skb
= alloc_skb(NLMSG_SPACE(len
), GFP_ATOMIC
);
125 printk(KERN_ERR
"netlink_broadcast ret=%d\n", ret
);
130 nlh
= NLMSG_PUT(skb
, 0, seq
, type
, len
);
131 memcpy(NLMSG_DATA(nlh
), msg
, len
);
133 NETLINK_CB(skb
).pid
= 0;
134 NETLINK_CB(skb
).dst_group
= 0;
136 ret
= netlink_broadcast(sock
, skb
, 0, group
+1, GFP_ATOMIC
);
142 printk(KERN_ERR
"netlink_broadcast g=%d, t=%d, l=%d, r=%d\n",
143 group
, type
, len
, ret
);
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