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61e12104 WK |
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 | ||
0ec473b5 JP |
14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
15 | ||
61e12104 WK |
16 | #include <linux/export.h> |
17 | #include <linux/etherdevice.h> | |
18 | #include <linux/netlink.h> | |
19 | #include <asm/byteorder.h> | |
20 | #include <net/sock.h> | |
21 | ||
22 | #include "netlink_k.h" | |
23 | ||
24 | #if defined(DEFINE_MUTEX) | |
25 | static DEFINE_MUTEX(netlink_mutex); | |
26 | #else | |
27 | static struct semaphore netlink_mutex; | |
28 | #define mutex_lock(x) down(x) | |
29 | #define mutex_unlock(x) up(x) | |
30 | #endif | |
31 | ||
32 | #define ND_MAX_GROUP 30 | |
33 | #define ND_IFINDEX_LEN sizeof(int) | |
34 | #define ND_NLMSG_SPACE(len) (NLMSG_SPACE(len) + ND_IFINDEX_LEN) | |
a6708372 DN |
35 | #define ND_NLMSG_DATA(nlh) ((void *)((char *)NLMSG_DATA(nlh) + \ |
36 | ND_IFINDEX_LEN)) | |
61e12104 WK |
37 | #define ND_NLMSG_S_LEN(len) (len+ND_IFINDEX_LEN) |
38 | #define ND_NLMSG_R_LEN(nlh) (nlh->nlmsg_len-ND_IFINDEX_LEN) | |
39 | #define ND_NLMSG_IFIDX(nlh) NLMSG_DATA(nlh) | |
40 | #define ND_MAX_MSG_LEN (1024 * 32) | |
41 | ||
42 | static void (*rcv_cb)(struct net_device *dev, u16 type, void *msg, int len); | |
43 | ||
44 | static void netlink_rcv_cb(struct sk_buff *skb) | |
45 | { | |
46 | struct nlmsghdr *nlh; | |
47 | struct net_device *dev; | |
48 | u32 mlen; | |
49 | void *msg; | |
50 | int ifindex; | |
51 | ||
52 | if (!rcv_cb) { | |
0ec473b5 | 53 | pr_err("nl cb - unregistered\n"); |
61e12104 WK |
54 | return; |
55 | } | |
56 | ||
58419939 | 57 | if (skb->len < NLMSG_HDRLEN) { |
0ec473b5 | 58 | pr_err("nl cb - invalid skb length\n"); |
61e12104 WK |
59 | return; |
60 | } | |
61 | ||
62 | nlh = (struct nlmsghdr *)skb->data; | |
63 | ||
64 | if (skb->len < nlh->nlmsg_len || nlh->nlmsg_len > ND_MAX_MSG_LEN) { | |
0ec473b5 | 65 | pr_err("nl cb - invalid length (%d,%d)\n", |
61e12104 WK |
66 | skb->len, nlh->nlmsg_len); |
67 | return; | |
68 | } | |
69 | ||
70 | memcpy(&ifindex, ND_NLMSG_IFIDX(nlh), ND_IFINDEX_LEN); | |
71 | msg = ND_NLMSG_DATA(nlh); | |
72 | mlen = ND_NLMSG_R_LEN(nlh); | |
73 | ||
74 | dev = dev_get_by_index(&init_net, ifindex); | |
75 | if (dev) { | |
76 | rcv_cb(dev, nlh->nlmsg_type, msg, mlen); | |
77 | dev_put(dev); | |
78 | } else { | |
0ec473b5 | 79 | pr_err("nl cb - dev (%d) not found\n", ifindex); |
61e12104 WK |
80 | } |
81 | } | |
82 | ||
83 | static void netlink_rcv(struct sk_buff *skb) | |
84 | { | |
85 | mutex_lock(&netlink_mutex); | |
86 | netlink_rcv_cb(skb); | |
87 | mutex_unlock(&netlink_mutex); | |
88 | } | |
89 | ||
90 | struct sock *netlink_init(int unit, | |
91 | void (*cb)(struct net_device *dev, u16 type, void *msg, int len)) | |
92 | { | |
93 | struct sock *sock; | |
61e12104 WK |
94 | struct netlink_kernel_cfg cfg = { |
95 | .input = netlink_rcv, | |
96 | }; | |
61e12104 WK |
97 | |
98 | #if !defined(DEFINE_MUTEX) | |
99 | init_MUTEX(&netlink_mutex); | |
100 | #endif | |
101 | ||
61e12104 | 102 | sock = netlink_kernel_create(&init_net, unit, &cfg); |
61e12104 WK |
103 | |
104 | if (sock) | |
105 | rcv_cb = cb; | |
106 | ||
107 | return sock; | |
108 | } | |
109 | ||
110 | void netlink_exit(struct sock *sock) | |
111 | { | |
112 | sock_release(sock->sk_socket); | |
113 | } | |
114 | ||
115 | int netlink_send(struct sock *sock, int group, u16 type, void *msg, int len) | |
116 | { | |
117 | static u32 seq; | |
118 | struct sk_buff *skb = NULL; | |
119 | struct nlmsghdr *nlh; | |
120 | int ret = 0; | |
121 | ||
122 | if (group > ND_MAX_GROUP) | |
123 | return -EINVAL; | |
124 | ||
125 | if (!netlink_has_listeners(sock, group+1)) | |
126 | return -ESRCH; | |
127 | ||
128 | skb = alloc_skb(NLMSG_SPACE(len), GFP_ATOMIC); | |
129 | if (!skb) | |
130 | return -ENOMEM; | |
131 | ||
132 | seq++; | |
133 | ||
134 | nlh = nlmsg_put(skb, 0, seq, type, len, 0); | |
135 | memcpy(NLMSG_DATA(nlh), msg, len); | |
61e12104 | 136 | NETLINK_CB(skb).portid = 0; |
61e12104 WK |
137 | NETLINK_CB(skb).dst_group = 0; |
138 | ||
139 | ret = netlink_broadcast(sock, skb, 0, group+1, GFP_ATOMIC); | |
140 | if (!ret) | |
141 | return len; | |
142 | ||
143 | if (ret != -ESRCH) | |
0ec473b5 | 144 | pr_err("nl broadcast g=%d, t=%d, l=%d, r=%d\n", |
61e12104 WK |
145 | group, type, len, ret); |
146 | else if (netlink_has_listeners(sock, group+1)) | |
147 | return -EAGAIN; | |
148 | ||
149 | return ret; | |
150 | } |