Commit | Line | Data |
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1146ee4a | 1 | // SPDX-License-Identifier: GPL-2.0 |
ad9bd58c | 2 | /* Copyright (c) 2012 GCT Semiconductor, Inc. All rights reserved. */ |
61e12104 | 3 | |
0ec473b5 JP |
4 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
5 | ||
61e12104 | 6 | #include <linux/export.h> |
bf5cad61 | 7 | #include <linux/mutex.h> |
61e12104 WK |
8 | #include <linux/etherdevice.h> |
9 | #include <linux/netlink.h> | |
10 | #include <asm/byteorder.h> | |
11 | #include <net/sock.h> | |
12 | ||
13 | #include "netlink_k.h" | |
14 | ||
61e12104 | 15 | static DEFINE_MUTEX(netlink_mutex); |
61e12104 WK |
16 | |
17 | #define ND_MAX_GROUP 30 | |
18 | #define ND_IFINDEX_LEN sizeof(int) | |
19 | #define ND_NLMSG_SPACE(len) (NLMSG_SPACE(len) + ND_IFINDEX_LEN) | |
a6708372 DN |
20 | #define ND_NLMSG_DATA(nlh) ((void *)((char *)NLMSG_DATA(nlh) + \ |
21 | ND_IFINDEX_LEN)) | |
959aabed DJAL |
22 | #define ND_NLMSG_S_LEN(len) ((len) + ND_IFINDEX_LEN) |
23 | #define ND_NLMSG_R_LEN(nlh) ((nlh)->nlmsg_len - ND_IFINDEX_LEN) | |
61e12104 WK |
24 | #define ND_NLMSG_IFIDX(nlh) NLMSG_DATA(nlh) |
25 | #define ND_MAX_MSG_LEN (1024 * 32) | |
26 | ||
27 | static void (*rcv_cb)(struct net_device *dev, u16 type, void *msg, int len); | |
28 | ||
29 | static void netlink_rcv_cb(struct sk_buff *skb) | |
30 | { | |
31 | struct nlmsghdr *nlh; | |
32 | struct net_device *dev; | |
33 | u32 mlen; | |
34 | void *msg; | |
35 | int ifindex; | |
36 | ||
37 | if (!rcv_cb) { | |
0ec473b5 | 38 | pr_err("nl cb - unregistered\n"); |
61e12104 WK |
39 | return; |
40 | } | |
41 | ||
58419939 | 42 | if (skb->len < NLMSG_HDRLEN) { |
0ec473b5 | 43 | pr_err("nl cb - invalid skb length\n"); |
61e12104 WK |
44 | return; |
45 | } | |
46 | ||
47 | nlh = (struct nlmsghdr *)skb->data; | |
48 | ||
49 | if (skb->len < nlh->nlmsg_len || nlh->nlmsg_len > ND_MAX_MSG_LEN) { | |
0ec473b5 | 50 | pr_err("nl cb - invalid length (%d,%d)\n", |
61e12104 WK |
51 | skb->len, nlh->nlmsg_len); |
52 | return; | |
53 | } | |
54 | ||
55 | memcpy(&ifindex, ND_NLMSG_IFIDX(nlh), ND_IFINDEX_LEN); | |
56 | msg = ND_NLMSG_DATA(nlh); | |
57 | mlen = ND_NLMSG_R_LEN(nlh); | |
58 | ||
59 | dev = dev_get_by_index(&init_net, ifindex); | |
60 | if (dev) { | |
61 | rcv_cb(dev, nlh->nlmsg_type, msg, mlen); | |
62 | dev_put(dev); | |
63 | } else { | |
0ec473b5 | 64 | pr_err("nl cb - dev (%d) not found\n", ifindex); |
61e12104 WK |
65 | } |
66 | } | |
67 | ||
68 | static void netlink_rcv(struct sk_buff *skb) | |
69 | { | |
70 | mutex_lock(&netlink_mutex); | |
71 | netlink_rcv_cb(skb); | |
72 | mutex_unlock(&netlink_mutex); | |
73 | } | |
74 | ||
75 | struct sock *netlink_init(int unit, | |
47678e37 BC |
76 | void (*cb)(struct net_device *dev, u16 type, |
77 | void *msg, int len)) | |
61e12104 WK |
78 | { |
79 | struct sock *sock; | |
61e12104 WK |
80 | struct netlink_kernel_cfg cfg = { |
81 | .input = netlink_rcv, | |
82 | }; | |
61e12104 | 83 | |
61e12104 | 84 | sock = netlink_kernel_create(&init_net, unit, &cfg); |
61e12104 WK |
85 | |
86 | if (sock) | |
87 | rcv_cb = cb; | |
88 | ||
89 | return sock; | |
90 | } | |
91 | ||
79530291 LP |
92 | int netlink_send(struct sock *sock, int group, u16 type, void *msg, int len, |
93 | struct net_device *dev) | |
61e12104 WK |
94 | { |
95 | static u32 seq; | |
96 | struct sk_buff *skb = NULL; | |
97 | struct nlmsghdr *nlh; | |
98 | int ret = 0; | |
99 | ||
100 | if (group > ND_MAX_GROUP) | |
101 | return -EINVAL; | |
102 | ||
b6f6fd8a | 103 | if (!netlink_has_listeners(sock, group + 1)) |
61e12104 WK |
104 | return -ESRCH; |
105 | ||
106 | skb = alloc_skb(NLMSG_SPACE(len), GFP_ATOMIC); | |
107 | if (!skb) | |
108 | return -ENOMEM; | |
109 | ||
110 | seq++; | |
111 | ||
112 | nlh = nlmsg_put(skb, 0, seq, type, len, 0); | |
113 | memcpy(NLMSG_DATA(nlh), msg, len); | |
61e12104 | 114 | NETLINK_CB(skb).portid = 0; |
61e12104 WK |
115 | NETLINK_CB(skb).dst_group = 0; |
116 | ||
ba7f55b7 | 117 | ret = netlink_broadcast(sock, skb, 0, group + 1, GFP_ATOMIC); |
61e12104 WK |
118 | if (!ret) |
119 | return len; | |
120 | ||
121 | if (ret != -ESRCH) | |
79530291 LP |
122 | netdev_err(dev, "nl broadcast g=%d, t=%d, l=%d, r=%d\n", |
123 | group, type, len, ret); | |
ba7f55b7 | 124 | else if (netlink_has_listeners(sock, group + 1)) |
61e12104 WK |
125 | return -EAGAIN; |
126 | ||
127 | return ret; | |
128 | } |