Commit | Line | Data |
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247e9cff SA |
1 | /* |
2 | * Copyright (c) 2012 GCT Semiconductor, Inc. All rights reserved. | |
3 | * | |
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. | |
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 | ||
cade0fe4 YT |
14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
15 | ||
247e9cff SA |
16 | #include <linux/module.h> |
17 | #include <linux/etherdevice.h> | |
b96dc464 | 18 | #include <net/netlink.h> |
247e9cff SA |
19 | #include <asm/byteorder.h> |
20 | #include <net/sock.h> | |
a6000538 | 21 | #include "netlink_k.h" |
247e9cff SA |
22 | |
23 | #if !defined(NLMSG_HDRLEN) | |
24 | #define NLMSG_HDRLEN ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr))) | |
25 | #endif | |
26 | ||
27 | #define ND_MAX_GROUP 30 | |
28 | #define ND_IFINDEX_LEN sizeof(int) | |
b96dc464 | 29 | #define ND_NLMSG_SPACE(len) (nlmsg_total_size(len) + ND_IFINDEX_LEN) |
247e9cff | 30 | #define ND_NLMSG_DATA(nlh) \ |
b96dc464 | 31 | ((void *)((char *)nlmsg_data(nlh) + ND_IFINDEX_LEN)) |
247e9cff SA |
32 | #define ND_NLMSG_S_LEN(len) (len+ND_IFINDEX_LEN) |
33 | #define ND_NLMSG_R_LEN(nlh) (nlh->nlmsg_len-ND_IFINDEX_LEN) | |
b96dc464 | 34 | #define ND_NLMSG_IFIDX(nlh) nlmsg_data(nlh) |
247e9cff SA |
35 | #define ND_MAX_MSG_LEN 8096 |
36 | ||
37 | #if defined(DEFINE_MUTEX) | |
38 | static DEFINE_MUTEX(netlink_mutex); | |
39 | #else | |
40 | static struct semaphore netlink_mutex; | |
41 | #define mutex_lock(x) down(x) | |
42 | #define mutex_unlock(x) up(x) | |
43 | #endif | |
44 | ||
45 | static void (*rcv_cb)(struct net_device *dev, u16 type, void *msg, int len); | |
46 | ||
47 | static void netlink_rcv_cb(struct sk_buff *skb) | |
48 | { | |
49 | struct nlmsghdr *nlh; | |
50 | struct net_device *dev; | |
51 | u32 mlen; | |
52 | void *msg; | |
53 | int ifindex; | |
54 | ||
b96dc464 | 55 | if (skb->len >= NLMSG_HDRLEN) { |
247e9cff SA |
56 | nlh = (struct nlmsghdr *)skb->data; |
57 | ||
a3709f7a DG |
58 | if (skb->len < nlh->nlmsg_len || |
59 | nlh->nlmsg_len > ND_MAX_MSG_LEN) { | |
cade0fe4 YT |
60 | netdev_err(skb->dev, "Invalid length (%d,%d)\n", |
61 | skb->len, nlh->nlmsg_len); | |
247e9cff SA |
62 | return; |
63 | } | |
64 | ||
65 | memcpy(&ifindex, ND_NLMSG_IFIDX(nlh), ND_IFINDEX_LEN); | |
66 | msg = ND_NLMSG_DATA(nlh); | |
67 | mlen = ND_NLMSG_R_LEN(nlh); | |
68 | ||
69 | if (rcv_cb) { | |
70 | dev = dev_get_by_index(&init_net, ifindex); | |
71 | if (dev) { | |
72 | rcv_cb(dev, nlh->nlmsg_type, msg, mlen); | |
73 | dev_put(dev); | |
74 | } else | |
cade0fe4 YT |
75 | netdev_err(skb->dev, |
76 | "dev_get_by_index(%d) is not found.\n", | |
77 | ifindex); | |
71fd11e1 | 78 | } else { |
cade0fe4 | 79 | netdev_err(skb->dev, "Unregistered Callback\n"); |
71fd11e1 | 80 | } |
247e9cff SA |
81 | } |
82 | } | |
83 | ||
84 | static void netlink_rcv(struct sk_buff *skb) | |
85 | { | |
86 | mutex_lock(&netlink_mutex); | |
87 | netlink_rcv_cb(skb); | |
88 | mutex_unlock(&netlink_mutex); | |
89 | } | |
90 | ||
91 | struct sock *netlink_init(int unit, void (*cb)(struct net_device *dev, u16 type, | |
39c511f8 | 92 | void *msg, int len)) |
247e9cff SA |
93 | { |
94 | struct sock *sock; | |
a31f2d17 PNA |
95 | struct netlink_kernel_cfg cfg = { |
96 | .input = netlink_rcv, | |
97 | }; | |
247e9cff SA |
98 | |
99 | #if !defined(DEFINE_MUTEX) | |
100 | init_MUTEX(&netlink_mutex); | |
101 | #endif | |
102 | ||
9f00d977 | 103 | sock = netlink_kernel_create(&init_net, unit, &cfg); |
247e9cff SA |
104 | |
105 | if (sock) | |
106 | rcv_cb = cb; | |
107 | ||
108 | return sock; | |
109 | } | |
110 | ||
111 | void netlink_exit(struct sock *sock) | |
112 | { | |
9f77186d | 113 | netlink_kernel_release(sock); |
247e9cff SA |
114 | } |
115 | ||
116 | int netlink_send(struct sock *sock, int group, u16 type, void *msg, int len) | |
117 | { | |
118 | static u32 seq; | |
119 | struct sk_buff *skb = NULL; | |
120 | struct nlmsghdr *nlh; | |
121 | int ret = 0; | |
122 | ||
123 | if (group > ND_MAX_GROUP) { | |
cade0fe4 YT |
124 | pr_err("Group %d is invalied.\n", group); |
125 | pr_err("Valid group is 0 ~ %d.\n", ND_MAX_GROUP); | |
247e9cff SA |
126 | return -EINVAL; |
127 | } | |
128 | ||
b96dc464 | 129 | skb = nlmsg_new(len, GFP_ATOMIC); |
247e9cff | 130 | if (!skb) { |
cade0fe4 | 131 | pr_err("netlink_broadcast ret=%d\n", ret); |
247e9cff SA |
132 | return -ENOMEM; |
133 | } | |
134 | ||
135 | seq++; | |
a8edf8a6 DM |
136 | nlh = nlmsg_put(skb, 0, seq, type, len, 0); |
137 | if (!nlh) { | |
138 | kfree_skb(skb); | |
139 | return -EMSGSIZE; | |
140 | } | |
141 | memcpy(nlmsg_data(nlh), msg, len); | |
247e9cff | 142 | |
15e47304 | 143 | NETLINK_CB(skb).portid = 0; |
247e9cff SA |
144 | NETLINK_CB(skb).dst_group = 0; |
145 | ||
146 | ret = netlink_broadcast(sock, skb, 0, group+1, GFP_ATOMIC); | |
147 | ||
71fd11e1 | 148 | if (!ret) { |
247e9cff | 149 | return len; |
71fd11e1 | 150 | } else { |
247e9cff | 151 | if (ret != -ESRCH) { |
cade0fe4 YT |
152 | pr_err("netlink_broadcast g=%d, t=%d, l=%d, r=%d\n", |
153 | group, type, len, ret); | |
247e9cff SA |
154 | } |
155 | ret = 0; | |
156 | } | |
247e9cff SA |
157 | return ret; |
158 | } |