netlink 库函数:
http://www.infradead.org/~tgr/libnl/doc/core.html#core_netlink_fundamentals
#define NETLINK_TEST (31)
static
int s_send_ack_to_test(struct lua_nl_ack *ack)
{
struct sk_buff *nl_skb;
struct nlmsghdr *nlh;
int ret;
int len = sizeof(*ack);
nl_skb = nlmsg_new(len, GFP_ATOMIC);
if (!nl_skb) {
pr_err("netlink: nlmsg_new fail\n");
return -1;
}
nlh = nlmsg_put(nl_skb, 0, 0, NETLINK_WNS, len, 0);
if(nlh == NULL) {
pr_err("netlink: nlmsg_put fail\n");
nlmsg_free(nl_skb);
return -1;
}
memcpy(nlmsg_data(nlh), (void *)ack, len);
ret = netlink_unicast(nlsk, nl_skb, NETLINK_WNS_LUA, MSG_DONTWAIT);
return ret;
}
static
void test_input_cb(struct sk_buff *skb)
{
struct nlmsghdr *nlh = NULL;
struct lua_nl_req *req = NULL;
struct lua_nl_ack ack;
nlh = (struct nlmsghdr *)skb->data;
if (NLMSG_OK(nlh, skb->len) && skb->len >= NLMSG_HDRLEN + sizeof(struct lua_nl_req)) {
req = (struct lua_nl_req *)NLMSG_DATA(nlh);
(void)s_get_ip_mac(req, &ack);
if (s_send_ack_to_test(&ack) < 0) {
pr_err("netlink: s_send_ack_to_lua error\n");
}
//TODO: netlink消息失败的情况需要再仔细考虑下,可能导致阻塞
}
else {
pr_err("netlink: parameters error\n");
}
return ;
}
static struct netlink_kernel_cfg cfg = {
.input = test_input_cb,
};
static
int s_init_netlink()
{
nlsk = netlink_kernel_create(&init_net, NETLINK_TEST, THIS_MODULE, &cfg);
if (!nlsk) {
pr_err("netlink: init fail\n");
return -1;
}
return 0;
}
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