static void netlink_rcv_cb(struct sk_buff *skb)
{
struct nlmsghdr *nlh;
struct net_device *dev;
u32 mlen;
void *msg;
int ifindex;
if (skb->len >= NLMSG_SPACE(0)) {
nlh = (struct nlmsghdr *)skb->data;
if (skb->len < nlh->nlmsg_len ||
nlh->nlmsg_len > ND_MAX_MSG_LEN) {
printk(KERN_ERR "Invalid length (%d,%d)\n", skb->len,
nlh->nlmsg_len);
return;
}
memcpy(&ifindex, ND_NLMSG_IFIDX(nlh), ND_IFINDEX_LEN);
msg = ND_NLMSG_DATA(nlh);
mlen = ND_NLMSG_R_LEN(nlh);
if (rcv_cb) {
dev = dev_get_by_index(&init_net, ifindex);
if (dev) {
rcv_cb(dev, nlh->nlmsg_type, msg, mlen);
dev_put(dev);
} else
printk(KERN_ERR "dev_get_by_index(%d) "
"is not found.\n", ifindex);
} else
printk(KERN_ERR "Unregistered Callback\n");
}
}
static void netlink_rcv_cb(struct sk_buff *skb)
{
struct nlmsghdr *nlh;
struct net_device *dev;
u32 mlen;
void *msg;
int ifindex;
if (!rcv_cb) {
pr_err("nl cb - unregistered\n");
return;
}
if (skb->len < NLMSG_HDRLEN) {
pr_err("nl cb - invalid skb length\n");
return;
}
nlh = (struct nlmsghdr *)skb->data;
if (skb->len < nlh->nlmsg_len || nlh->nlmsg_len > ND_MAX_MSG_LEN) {
pr_err("nl cb - invalid length (%d,%d)\n",
skb->len, nlh->nlmsg_len);
return;
}
memcpy(&ifindex, ND_NLMSG_IFIDX(nlh), ND_IFINDEX_LEN);
msg = ND_NLMSG_DATA(nlh);
mlen = ND_NLMSG_R_LEN(nlh);
dev = dev_get_by_index(&init_net, ifindex);
if (dev) {
rcv_cb(dev, nlh->nlmsg_type, msg, mlen);
dev_put(dev);
} else {
pr_err("nl cb - dev (%d) not found\n", ifindex);
}
}