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Netlink 内核实现分析 4

古得曼_63b6 2022-06-24 阅读 96

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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