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-rw-r--r--examples/rtnl/rtnl-route-dump.c247
1 files changed, 247 insertions, 0 deletions
diff --git a/examples/rtnl/rtnl-route-dump.c b/examples/rtnl/rtnl-route-dump.c
new file mode 100644
index 0000000..34c95cf
--- /dev/null
+++ b/examples/rtnl/rtnl-route-dump.c
@@ -0,0 +1,247 @@
+/*
+ * (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 <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <time.h>
+#include <arpa/inet.h>
+
+#include <libmnl/libmnl.h>
+#include <linux/if.h>
+#include <linux/if_link.h>
+#include <linux/rtnetlink.h>
+
+static int data_attr_cb2(const struct nlattr *attr, void *data)
+{
+ /* skip unsupported attribute in user-space */
+ if (mnl_attr_type_valid(attr, RTAX_MAX) < 0)
+ return MNL_CB_OK;
+
+ if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) {
+ perror("mnl_attr_validate");
+ return MNL_CB_ERROR;
+ }
+ return MNL_CB_OK;
+}
+
+static void attributes_show_ipv4(struct nlattr *tb[])
+{
+ if (tb[RTA_TABLE]) {
+ printf("table=%u ", mnl_attr_get_u32(tb[RTA_TABLE]));
+ }
+ if (tb[RTA_DST]) {
+ struct in_addr *addr = mnl_attr_get_payload(tb[RTA_DST]);
+ printf("dst=%s ", inet_ntoa(*addr));
+ }
+ if (tb[RTA_SRC]) {
+ struct in_addr *addr = mnl_attr_get_payload(tb[RTA_SRC]);
+ printf("src=%s ", inet_ntoa(*addr));
+ }
+ if (tb[RTA_OIF]) {
+ printf("oif=%u ", mnl_attr_get_u32(tb[RTA_OIF]));
+ }
+ if (tb[RTA_FLOW]) {
+ printf("flow=%u ", mnl_attr_get_u32(tb[RTA_FLOW]));
+ }
+ if (tb[RTA_PREFSRC]) {
+ struct in_addr *addr = mnl_attr_get_payload(tb[RTA_PREFSRC]);
+ printf("prefsrc=%s ", inet_ntoa(*addr));
+ }
+ if (tb[RTA_GATEWAY]) {
+ struct in_addr *addr = mnl_attr_get_payload(tb[RTA_GATEWAY]);
+ printf("gw=%s ", inet_ntoa(*addr));
+ }
+ if (tb[RTA_METRICS]) {
+ int i;
+ struct nlattr *tbx[RTAX_MAX+1] = {};
+
+ mnl_attr_parse_nested(tb[RTA_METRICS], data_attr_cb2, tbx);
+
+ for (i=0; i<RTAX_MAX; i++) {
+ if (tbx[i]) {
+ printf("metrics[%d]=%u ",
+ i, mnl_attr_get_u32(tbx[i]));
+ }
+ }
+ }
+ printf("\n");
+}
+
+static int data_attr_cb(const struct nlattr *attr, void *data)
+{
+ const struct nlattr **tb = (const struct nlattr **)data;
+ int type = mnl_attr_get_type(attr);
+
+ /* skip unsupported attribute in user-space */
+ if (mnl_attr_type_valid(attr, RTA_MAX) < 0)
+ return MNL_CB_OK;
+
+ switch(type) {
+ case RTA_TABLE:
+ case RTA_DST:
+ case RTA_SRC:
+ case RTA_OIF:
+ case RTA_FLOW:
+ case RTA_PREFSRC:
+ case RTA_GATEWAY:
+ if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) {
+ perror("mnl_attr_validate");
+ return MNL_CB_ERROR;
+ }
+ break;
+ case RTA_METRICS:
+ if (mnl_attr_validate(attr, MNL_TYPE_NESTED) < 0) {
+ perror("mnl_attr_validate");
+ return MNL_CB_ERROR;
+ }
+ break;
+ }
+ tb[type] = attr;
+ return MNL_CB_OK;
+}
+
+static int data_cb(const struct nlmsghdr *nlh, void *data)
+{
+ struct nlattr *tb[RTA_MAX+1] = {};
+ struct rtmsg *rm = mnl_nlmsg_get_payload(nlh);
+
+ /* protocol family = AF_INET | AF_INET6 */
+ printf("family=%u ", rm->rtm_family);
+
+ /* destination CIDR, eg. 24 or 32 for IPv4 */
+ printf("dst_len=%u ", rm->rtm_dst_len);
+
+ /* source CIDR */
+ printf("src_len=%u ", rm->rtm_src_len);
+
+ /* type of service (TOS), eg. 0 */
+ printf("tos=%u ", rm->rtm_tos);
+
+ /* table id:
+ * RT_TABLE_UNSPEC = 0
+ *
+ * ... user defined values ...
+ *
+ * RT_TABLE_COMPAT = 252
+ * RT_TABLE_DEFAULT = 253
+ * RT_TABLE_MAIN = 254
+ * RT_TABLE_LOCAL = 255
+ * RT_TABLE_MAX = 0xFFFFFFFF
+ *
+ * Synonimous attribute: RTA_TABLE.
+ */
+ printf("table=%u ", rm->rtm_table);
+
+ /* type:
+ * RTN_UNSPEC = 0
+ * RTN_UNICAST = 1
+ * RTN_LOCAL = 2
+ * RTN_BROADCAST = 3
+ * RTN_ANYCAST = 4
+ * RTN_MULTICAST = 5
+ * RTN_BLACKHOLE = 6
+ * RTN_UNREACHABLE = 7
+ * RTN_PROHIBIT = 8
+ * RTN_THROW = 9
+ * RTN_NAT = 10
+ * RTN_XRESOLVE = 11
+ * __RTN_MAX = 12
+ */
+ printf("type=%u ", rm->rtm_type);
+
+ /* scope:
+ * RT_SCOPE_UNIVERSE = 0 : everywhere in the universe
+ *
+ * ... user defined values ...
+ *
+ * RT_SCOPE_SITE = 200
+ * RT_SCOPE_LINK = 253 : destination attached to link
+ * RT_SCOPE_HOST = 254 : local address
+ * RT_SCOPE_NOWHERE = 255 : not existing destination
+ */
+ printf("scope=%u ", rm->rtm_scope);
+
+ /* protocol:
+ * RTPROT_UNSPEC = 0
+ * RTPROT_REDIRECT = 1
+ * RTPROT_KERNEL = 2 : route installed by kernel
+ * RTPROT_BOOT = 3 : route installed during boot
+ * RTPROT_STATIC = 4 : route installed by administrator
+ *
+ * Values >= RTPROT_STATIC are not interpreted by kernel, they are
+ * just user-defined.
+ */
+ printf("proto=%u ", rm->rtm_protocol);
+
+ /* flags:
+ * RTM_F_NOTIFY = 0x100: notify user of route change
+ * RTM_F_CLONED = 0x200: this route is cloned
+ * RTM_F_EQUALIZE = 0x400: Multipath equalizer: NI
+ * RTM_F_PREFIX = 0x800: Prefix addresses
+ */
+ printf("flags=%x\n", rm->rtm_flags);
+
+ mnl_attr_parse(nlh, sizeof(*rm), data_attr_cb, tb);
+
+ switch(rm->rtm_family) {
+ case AF_INET:
+ attributes_show_ipv4(tb);
+ break;
+ }
+
+ return MNL_CB_OK;
+}
+
+int main()
+{
+ struct mnl_socket *nl;
+ char buf[getpagesize()];
+ struct nlmsghdr *nlh;
+ struct rtmsg *rtm;
+ int ret;
+ unsigned int seq, portid;
+
+ nlh = mnl_nlmsg_put_header(buf);
+ nlh->nlmsg_type = RTM_GETROUTE;
+ nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
+ nlh->nlmsg_seq = seq = time(NULL);
+ rtm = mnl_nlmsg_put_extra_header(nlh, sizeof(struct rtmsg));
+ rtm->rtm_family = AF_INET;
+
+ 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_send");
+ exit(EXIT_FAILURE);
+ }
+
+ ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+ while (ret > 0) {
+ ret = mnl_cb_run(buf, ret, seq, portid, data_cb, NULL);
+ if (ret <= MNL_CB_STOP)
+ break;
+ ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+ }
+ if (ret == -1) {
+ perror("error");
+ exit(EXIT_FAILURE);
+ }
+
+ mnl_socket_close(nl);
+
+ return 0;
+}