/* This example is placed in the public domain. */ #include #include #include #include #include #include #include #include #include #include #include int main(int argc, char *argv[]) { struct mnl_socket *nl; char buf[MNL_SOCKET_BUFFER_SIZE]; struct nlmsghdr *nlh; struct rtmsg *rtm; uint32_t prefix, seq, portid; union { in_addr_t ip; struct in6_addr ip6; } dst; union { in_addr_t ip; struct in6_addr ip6; } gw; int iface, ret, family = AF_INET; if (argc <= 3) { printf("Usage: %s iface destination cidr [gateway]\n", argv[0]); printf("Example: %s eth0 10.0.1.12 32 10.0.1.11\n", argv[0]); printf(" %s eth0 ffff::10.0.1.12 128 fdff::1\n", argv[0]); exit(EXIT_FAILURE); } iface = if_nametoindex(argv[1]); if (iface == 0) { perror("if_nametoindex"); exit(EXIT_FAILURE); } if (!inet_pton(AF_INET, argv[2], &dst)) { if (!inet_pton(AF_INET6, argv[2], &dst)) { perror("inet_pton"); exit(EXIT_FAILURE); } family = AF_INET6; } if (sscanf(argv[3], "%u", &prefix) == 0) { perror("sscanf"); exit(EXIT_FAILURE); } if (argc == 5 && !inet_pton(family, argv[4], &gw)) { perror("inet_pton"); exit(EXIT_FAILURE); } nlh = mnl_nlmsg_put_header(buf); nlh->nlmsg_type = RTM_NEWROUTE; nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_ACK; nlh->nlmsg_seq = seq = time(NULL); rtm = mnl_nlmsg_put_extra_header(nlh, sizeof(struct rtmsg)); rtm->rtm_family = family; rtm->rtm_dst_len = prefix; rtm->rtm_src_len = 0; rtm->rtm_tos = 0; rtm->rtm_protocol = RTPROT_STATIC; rtm->rtm_table = RT_TABLE_MAIN; rtm->rtm_type = RTN_UNICAST; /* is there any gateway? */ rtm->rtm_scope = (argc == 4) ? RT_SCOPE_LINK : RT_SCOPE_UNIVERSE; rtm->rtm_flags = 0; if (family == AF_INET) mnl_attr_put_u32(nlh, RTA_DST, dst.ip); else mnl_attr_put(nlh, RTA_DST, sizeof(struct in6_addr), &dst); mnl_attr_put_u32(nlh, RTA_OIF, iface); if (argc == 5) { if (family == AF_INET) mnl_attr_put_u32(nlh, RTA_GATEWAY, gw.ip); else { mnl_attr_put(nlh, RTA_GATEWAY, sizeof(struct in6_addr), &gw.ip6); } } nl = mnl_socket_open(NETLINK_ROUTE); if (nl == NULL) { perror("mnl_socket_open"); exit(EXIT_FAILURE); } if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) { perror("mnl_socket_bind"); exit(EXIT_FAILURE); } portid = mnl_socket_get_portid(nl); if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) { perror("mnl_socket_sendto"); exit(EXIT_FAILURE); } ret = mnl_socket_recvfrom(nl, buf, sizeof(buf)); if (ret < 0) { perror("mnl_socket_recvfrom"); exit(EXIT_FAILURE); } ret = mnl_cb_run(buf, ret, seq, portid, NULL, NULL); if (ret < 0) { perror("mnl_cb_run"); exit(EXIT_FAILURE); } mnl_socket_close(nl); return 0; }