summaryrefslogtreecommitdiffstats
path: root/examples/rtnl/rtnl-route-add.c
diff options
context:
space:
mode:
Diffstat (limited to 'examples/rtnl/rtnl-route-add.c')
-rw-r--r--examples/rtnl/rtnl-route-add.c99
1 files changed, 99 insertions, 0 deletions
diff --git a/examples/rtnl/rtnl-route-add.c b/examples/rtnl/rtnl-route-add.c
new file mode 100644
index 0000000..1f2d1a0
--- /dev/null
+++ b/examples/rtnl/rtnl-route-add.c
@@ -0,0 +1,99 @@
+/*
+ * (C) 2009-2010 by Pablo Neira Ayuso <pablo@netfilter.org>
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License, incorporated herein by reference.
+ */
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <time.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <strings.h>
+#include <net/if.h>
+
+#include <libmnl/libmnl.h>
+#include <linux/if_link.h>
+#include <linux/rtnetlink.h>
+
+int main(int argc, char *argv[])
+{
+ 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]);
+ exit(EXIT_FAILURE);
+ }
+
+ int iface;
+ iface = if_nametoindex(argv[1]);
+ if (iface == 0) {
+ printf("Bad interface name\n");
+ exit(EXIT_FAILURE);
+ }
+
+ in_addr_t dst;
+ if (!inet_pton(AF_INET, argv[2], &dst)) {
+ printf("Bad destination\n");
+ exit(EXIT_FAILURE);
+ }
+
+ uint32_t mask;
+ if (sscanf(argv[3], "%u", &mask) == 0) {
+ printf("Bad CIDR\n");
+ exit(EXIT_FAILURE);
+ }
+
+ in_addr_t gw;
+ if (argc >= 5 && !inet_pton(AF_INET, argv[4], &gw)) {
+ printf("Bad gateway\n");
+ exit(EXIT_FAILURE);
+ }
+
+ struct mnl_socket *nl;
+ char buf[getpagesize()];
+ struct nlmsghdr *nlh;
+ struct rtmsg *rtm;
+
+ nlh = mnl_nlmsg_put_header(buf);
+ nlh->nlmsg_type = RTM_NEWROUTE;
+ nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE;
+ nlh->nlmsg_seq = time(NULL);
+
+ rtm = mnl_nlmsg_put_extra_header(nlh, sizeof(struct rtmsg));
+ rtm->rtm_family = AF_INET;
+ rtm->rtm_dst_len = mask;
+ rtm->rtm_src_len = 0;
+ rtm->rtm_tos = 0;
+ rtm->rtm_protocol = RTPROT_BOOT;
+ 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;
+
+ mnl_attr_put_u32(nlh, RTA_DST, dst);
+ mnl_attr_put_u32(nlh, RTA_OIF, iface);
+ if (argc >= 5)
+ mnl_attr_put_u32(nlh, RTA_GATEWAY, gw);
+
+ 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);
+ }
+
+ if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
+ perror("mnl_socket_send");
+ exit(EXIT_FAILURE);
+ }
+
+ mnl_socket_close(nl);
+
+ return 0;
+}