应用层通过socket接口的XFRM_MSG_NEWSA类型新增一个xfrm_usersa_info的C代码

#include <linux/xfrm.h> #include <linux/socket.h>

// 定义一个函数，用于新增xfrm_usersa_info int add_xfrm_usersa_info(int sockfd, struct xfrm_usersa_info *info) { // 定义一个消息结构体 struct { struct nlmsghdr nlh; struct xfrm_usersa_info info; } req;

// 初始化消息结构体
memset(&req, 0, sizeof(req));
req.nlh.nlmsg_type = XFRM_MSG_NEWSA; // 指定消息类型为XFRM_MSG_NEWSA
req.nlh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL;
req.info = *info;

// 发送消息
struct sockaddr_nl addr;
memset(&addr, 0, sizeof(addr));
addr.nl_family = AF_NETLINK;
struct iovec iov = { &req, sizeof(req) };
struct msghdr msg = { &addr, sizeof(addr), &iov, 1, NULL, 0, 0 };
return sendmsg(sockfd, &msg, 0);