151 lines
3.5 KiB
C
151 lines
3.5 KiB
C
/*
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* Copyright (c) 2012 GCT Semiconductor, Inc. All rights reserved.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/version.h>
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#include <linux/module.h>
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#include <linux/etherdevice.h>
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#include <linux/netlink.h>
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#include <asm/byteorder.h>
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#include <net/sock.h>
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#if !defined(NLMSG_HDRLEN)
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#define NLMSG_HDRLEN ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))
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#endif
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#define ND_MAX_GROUP 30
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#define ND_IFINDEX_LEN sizeof(int)
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#define ND_NLMSG_SPACE(len) (NLMSG_SPACE(len) + ND_IFINDEX_LEN)
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#define ND_NLMSG_DATA(nlh) \
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((void *)((char *)NLMSG_DATA(nlh) + ND_IFINDEX_LEN))
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#define ND_NLMSG_S_LEN(len) (len+ND_IFINDEX_LEN)
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#define ND_NLMSG_R_LEN(nlh) (nlh->nlmsg_len-ND_IFINDEX_LEN)
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#define ND_NLMSG_IFIDX(nlh) NLMSG_DATA(nlh)
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#define ND_MAX_MSG_LEN 8096
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#if defined(DEFINE_MUTEX)
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static DEFINE_MUTEX(netlink_mutex);
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#else
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static struct semaphore netlink_mutex;
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#define mutex_lock(x) down(x)
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#define mutex_unlock(x) up(x)
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#endif
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static void (*rcv_cb)(struct net_device *dev, u16 type, void *msg, int len);
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static void netlink_rcv_cb(struct sk_buff *skb)
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{
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struct nlmsghdr *nlh;
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struct net_device *dev;
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u32 mlen;
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void *msg;
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int ifindex;
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if (skb->len >= NLMSG_SPACE(0)) {
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nlh = (struct nlmsghdr *)skb->data;
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if (skb->len < nlh->nlmsg_len ||
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nlh->nlmsg_len > ND_MAX_MSG_LEN) {
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printk(KERN_ERR "Invalid length (%d,%d)\n", skb->len,
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nlh->nlmsg_len);
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return;
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}
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memcpy(&ifindex, ND_NLMSG_IFIDX(nlh), ND_IFINDEX_LEN);
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msg = ND_NLMSG_DATA(nlh);
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mlen = ND_NLMSG_R_LEN(nlh);
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if (rcv_cb) {
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dev = dev_get_by_index(&init_net, ifindex);
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if (dev) {
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rcv_cb(dev, nlh->nlmsg_type, msg, mlen);
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dev_put(dev);
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} else
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printk(KERN_ERR "dev_get_by_index(%d) "
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"is not found.\n", ifindex);
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} else
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printk(KERN_ERR "Unregistered Callback\n");
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}
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}
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static void netlink_rcv(struct sk_buff *skb)
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{
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mutex_lock(&netlink_mutex);
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netlink_rcv_cb(skb);
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mutex_unlock(&netlink_mutex);
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}
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struct sock *netlink_init(int unit, void (*cb)(struct net_device *dev, u16 type,
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void *msg, int len))
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{
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struct sock *sock;
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#if !defined(DEFINE_MUTEX)
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init_MUTEX(&netlink_mutex);
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#endif
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sock = netlink_kernel_create(&init_net, unit, 0, netlink_rcv, NULL,
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THIS_MODULE);
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if (sock)
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rcv_cb = cb;
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return sock;
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}
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void netlink_exit(struct sock *sock)
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{
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sock_release(sock->sk_socket);
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}
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int netlink_send(struct sock *sock, int group, u16 type, void *msg, int len)
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{
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static u32 seq;
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struct sk_buff *skb = NULL;
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struct nlmsghdr *nlh;
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int ret = 0;
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if (group > ND_MAX_GROUP) {
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printk(KERN_ERR "Group %d is invalied.\n", group);
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printk(KERN_ERR "Valid group is 0 ~ %d.\n", ND_MAX_GROUP);
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return -EINVAL;
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}
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skb = alloc_skb(NLMSG_SPACE(len), GFP_ATOMIC);
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if (!skb) {
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printk(KERN_ERR "netlink_broadcast ret=%d\n", ret);
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return -ENOMEM;
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}
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seq++;
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nlh = NLMSG_PUT(skb, 0, seq, type, len);
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memcpy(NLMSG_DATA(nlh), msg, len);
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NETLINK_CB(skb).pid = 0;
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NETLINK_CB(skb).dst_group = 0;
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ret = netlink_broadcast(sock, skb, 0, group+1, GFP_ATOMIC);
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if (!ret)
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return len;
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else {
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if (ret != -ESRCH) {
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printk(KERN_ERR "netlink_broadcast g=%d, t=%d, l=%d, r=%d\n",
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group, type, len, ret);
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}
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ret = 0;
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}
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nlmsg_failure:
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return ret;
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}
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