int add_link()
{
struct rtattr *nest;
struct link_req req, ans;
int rtnetlink_sk, ifindex;
int ret;
rtnetlink_sk = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
memset(&req, 0, sizeof(req));
req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
req.nh.nlmsg_flags = NLM_F_REQUEST;
req.nh.nlmsg_type = RTM_NEWLINK;
req.ifa.ifi_family = AF_UNSPEC;
printf("nh:%ld, ifa:%ld, nlmsg_len:%d\n", sizeof(req.nh), sizeof(req.ifa), req.nh.nlmsg_len);
nest = rta_begin_nested(&req, IFLA_LINKINFO);
rta_put(&req, IFLA_INFO_KIND, "macvlan", strlen("macvlan")+1);
rta_end_nested(&req, nest);
printf("rta_len:%d, nlmsg_len:%d\n", nest->rta_len, req.nh.nlmsg_len);
ifindex = if_nametoindex("eth0");
rta_put(&req, IFLA_LINK, &ifindex, sizeof(int));
printf("nlmsg_len:%d\n", req.nh.nlmsg_len);
rta_put(&req, IFLA_IFNAME, "macvlan001", strlen("macvlan001")+1);
printf("nlmsg_len:%d\n", req.nh.nlmsg_len);
printf("send request for add macvlan001\n");
ret = send(rtnetlink_sk, &req, req.nh.nlmsg_len, 0);
printf("send ret:%d\n", ret);
ret = recv(rtnetlink_sk, &ans, NLMSG_LENGTH(sizeof(struct ifinfomsg) + 1024), 0);
printf("recv ret:%d, nlmsg_type:%d\n", ret, ans.nh.nlmsg_type);
if (ans.nh.nlmsg_type == NLMSG_ERROR) {
struct nlmsgerr *err = (struct nlmsgerr*)NLMSG_DATA(&ans);
printf("error:%d\n", err->error);
return err->error;
}
return 0;
}
struct rtattr *rta_begin_nested(struct link_req *req, int attr)
{
struct rtattr *rtattr = NLMSG_TAIL(&req->nh);
if (rta_put(req, attr, NULL, 0))
return NULL;
return rtattr;
}
hidden int
rta_put_address(struct nlmsghdr *msg, int type, struct sockaddr *adr)
{
switch (adr->sa_family) {
case AF_INET: {
struct in_addr *i = rta_put(msg, type, 4);
*i = ((struct sockaddr_in *)adr)->sin_addr;
break;
}
case AF_INET6: {
struct in6_addr *i6 = rta_put(msg, type, 16);
*i6 = ((struct sockaddr_in6 *)adr)->sin6_addr;
break;
}
default:
return -1;
}
return 0;
}
