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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
16 #include <linux/module.h>
17 #include <linux/etherdevice.h>
18 #include <net/netlink.h>
19 #include <asm/byteorder.h>
21 #include "netlink_k.h"
23 #if !defined(NLMSG_HDRLEN)
24 #define NLMSG_HDRLEN ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))
27 #define ND_MAX_GROUP 30
28 #define ND_IFINDEX_LEN sizeof(int)
29 #define ND_NLMSG_SPACE(len) (nlmsg_total_size(len) + ND_IFINDEX_LEN)
30 #define ND_NLMSG_DATA(nlh) \
31 ((void *)((char *)nlmsg_data(nlh) + ND_IFINDEX_LEN))
32 #define ND_NLMSG_S_LEN(len) (len+ND_IFINDEX_LEN)
33 #define ND_NLMSG_R_LEN(nlh) (nlh->nlmsg_len-ND_IFINDEX_LEN)
34 #define ND_NLMSG_IFIDX(nlh) nlmsg_data(nlh)
35 #define ND_MAX_MSG_LEN 8096
37 #if defined(DEFINE_MUTEX)
38 static DEFINE_MUTEX(netlink_mutex
);
40 static struct semaphore netlink_mutex
;
41 #define mutex_lock(x) down(x)
42 #define mutex_unlock(x) up(x)
45 static void (*rcv_cb
)(struct net_device
*dev
, u16 type
, void *msg
, int len
);
47 static void netlink_rcv_cb(struct sk_buff
*skb
)
50 struct net_device
*dev
;
55 if (skb
->len
>= NLMSG_HDRLEN
) {
56 nlh
= (struct nlmsghdr
*)skb
->data
;
58 if (skb
->len
< nlh
->nlmsg_len
||
59 nlh
->nlmsg_len
> ND_MAX_MSG_LEN
) {
60 netdev_err(skb
->dev
, "Invalid length (%d,%d)\n",
61 skb
->len
, nlh
->nlmsg_len
);
65 memcpy(&ifindex
, ND_NLMSG_IFIDX(nlh
), ND_IFINDEX_LEN
);
66 msg
= ND_NLMSG_DATA(nlh
);
67 mlen
= ND_NLMSG_R_LEN(nlh
);
70 dev
= dev_get_by_index(&init_net
, ifindex
);
72 rcv_cb(dev
, nlh
->nlmsg_type
, msg
, mlen
);
76 "dev_get_by_index(%d) is not found.\n",
79 netdev_err(skb
->dev
, "Unregistered Callback\n");
84 static void netlink_rcv(struct sk_buff
*skb
)
86 mutex_lock(&netlink_mutex
);
88 mutex_unlock(&netlink_mutex
);
91 struct sock
*netlink_init(int unit
, void (*cb
)(struct net_device
*dev
, u16 type
,
95 struct netlink_kernel_cfg cfg
= {
99 #if !defined(DEFINE_MUTEX)
100 init_MUTEX(&netlink_mutex
);
103 sock
= netlink_kernel_create(&init_net
, unit
, &cfg
);
111 void netlink_exit(struct sock
*sock
)
113 netlink_kernel_release(sock
);
116 int netlink_send(struct sock
*sock
, int group
, u16 type
, void *msg
, int len
)
119 struct sk_buff
*skb
= NULL
;
120 struct nlmsghdr
*nlh
;
123 if (group
> ND_MAX_GROUP
) {
124 pr_err("Group %d is invalid.\n", group
);
125 pr_err("Valid group is 0 ~ %d.\n", ND_MAX_GROUP
);
129 skb
= nlmsg_new(len
, GFP_ATOMIC
);
131 pr_err("netlink_broadcast ret=%d\n", ret
);
136 nlh
= nlmsg_put(skb
, 0, seq
, type
, len
, 0);
141 memcpy(nlmsg_data(nlh
), msg
, len
);
143 NETLINK_CB(skb
).portid
= 0;
144 NETLINK_CB(skb
).dst_group
= 0;
146 ret
= netlink_broadcast(sock
, skb
, 0, group
+1, GFP_ATOMIC
);
151 pr_err("netlink_broadcast g=%d, t=%d, l=%d, r=%d\n",
152 group
, type
, len
, ret
);
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