#include #include int main(int argc, char *argv[]) { struct nl_cache *link_cache; struct rtnl_link *link; struct in_addr addr; struct nl_sock *sk; int err, if_index; sk = nl_socket_alloc(); if ((err = nl_connect(sk, NETLINK_ROUTE)) < 0) { nl_perror(err, "Unable to connect socket"); return err; } err = rtnl_link_alloc_cache(sk, AF_UNSPEC, &link_cache); if ( err < 0) { nl_perror(err, "Unable to allocate cache"); return err; } if_index = rtnl_link_name2i(link_cache, "eno16777736"); if (!if_index) { fprintf(stderr, "Unable to lookup eno16777736"); return -1; } link = rtnl_link_ipip_alloc(); if(!link) { nl_perror(err, "Unable to allocate link"); return -1; } rtnl_link_set_name(link, "ipip-tun"); rtnl_link_ipip_set_link(link, if_index); inet_pton(AF_INET, "192.168.254.12", &addr.s_addr); rtnl_link_ipip_set_local(link, addr.s_addr); inet_pton(AF_INET, "192.168.254.13", &addr.s_addr); rtnl_link_ipip_set_remote(link, addr.s_addr); rtnl_link_ipip_set_ttl(link, 64); err = rtnl_link_add(sk, link, NLM_F_CREATE); if (err < 0) { nl_perror(err, "Unable to add link"); return err; } rtnl_link_put(link); nl_close(sk); return 0; }