--- /dev/null
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * iplink_netkit.c netkit device management
+ *
+ * Authors: Daniel Borkmann <daniel@iogearbox.net>
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <linux/if_link.h>
+
+#include "rt_names.h"
+#include "utils.h"
+#include "ip_common.h"
+
+static const char * const netkit_mode_strings[] = {
+ [NETKIT_L2] = "l2",
+ [NETKIT_L3] = "l3",
+};
+
+static const char * const netkit_policy_strings[] = {
+ [NETKIT_PASS] = "forward",
+ [NETKIT_DROP] = "blackhole",
+};
+
+static void explain(struct link_util *lu, FILE *f)
+{
+ fprintf(f,
+ "Usage: ... %s [ mode MODE ] [ POLICY ] [ peer [ POLICY <options> ] ]\n"
+ "\n"
+ "MODE: l3 | l2\n"
+ "POLICY: forward | blackhole\n"
+ "(first values are the defaults if nothing is specified)\n"
+ "\n"
+ "To get <options> type 'ip link add help'.\n",
+ lu->id);
+}
+
+static int netkit_parse_opt(struct link_util *lu, int argc, char **argv,
+ struct nlmsghdr *n)
+{
+ __u32 ifi_flags, ifi_change, ifi_index;
+ struct ifinfomsg *ifm, *peer_ifm;
+ static bool seen_mode, seen_peer;
+ static struct rtattr *data;
+ int err;
+
+ ifm = NLMSG_DATA(n);
+ ifi_flags = ifm->ifi_flags;
+ ifi_change = ifm->ifi_change;
+ ifi_index = ifm->ifi_index;
+ ifm->ifi_flags = 0;
+ ifm->ifi_change = 0;
+ ifm->ifi_index = 0;
+ while (argc > 0) {
+ if (strcmp(*argv, "mode") == 0) {
+ __u32 mode = 0;
+
+ NEXT_ARG();
+ if (seen_mode)
+ duparg("mode", *argv);
+ seen_mode = true;
+
+ if (strcmp(*argv, "l3") == 0) {
+ mode = NETKIT_L3;
+ } else if (strcmp(*argv, "l2") == 0) {
+ mode = NETKIT_L2;
+ } else {
+ fprintf(stderr, "Error: argument of \"mode\" must be either \"l3\" or \"l2\"\n");
+ return -1;
+ }
+ addattr32(n, 1024, IFLA_NETKIT_MODE, mode);
+ } else if (strcmp(*argv, "forward") == 0 ||
+ strcmp(*argv, "blackhole") == 0) {
+ int attr_name = seen_peer ?
+ IFLA_NETKIT_PEER_POLICY :
+ IFLA_NETKIT_POLICY;
+ __u32 policy = 0;
+
+ if (strcmp(*argv, "forward") == 0) {
+ policy = NETKIT_PASS;
+ } else if (strcmp(*argv, "blackhole") == 0) {
+ policy = NETKIT_DROP;
+ } else {
+ fprintf(stderr, "Error: policy must be either \"forward\" or \"blackhole\"\n");
+ return -1;
+ }
+ addattr32(n, 1024, attr_name, policy);
+ } else if (strcmp(*argv, "peer") == 0) {
+ if (seen_peer)
+ duparg("peer", *(argv + 1));
+ seen_peer = true;
+ } else {
+ char *type = NULL;
+
+ if (seen_peer) {
+ data = addattr_nest(n, 1024, IFLA_NETKIT_PEER_INFO);
+ n->nlmsg_len += sizeof(struct ifinfomsg);
+ err = iplink_parse(argc, argv, (struct iplink_req *)n, &type);
+ if (err < 0)
+ return err;
+ if (type)
+ duparg("type", argv[err]);
+ goto out_ok;
+ }
+ fprintf(stderr, "%s: unknown option \"%s\"?\n",
+ lu->id, *argv);
+ explain(lu, stderr);
+ return -1;
+ }
+ argc--;
+ argv++;
+ }
+out_ok:
+ if (data) {
+ peer_ifm = RTA_DATA(data);
+ peer_ifm->ifi_index = ifm->ifi_index;
+ peer_ifm->ifi_flags = ifm->ifi_flags;
+ peer_ifm->ifi_change = ifm->ifi_change;
+ addattr_nest_end(n, data);
+ }
+ ifm->ifi_flags = ifi_flags;
+ ifm->ifi_change = ifi_change;
+ ifm->ifi_index = ifi_index;
+ return 0;
+}
+
+static const char *netkit_print_policy(__u32 policy)
+{
+ const char *inv = "UNKNOWN";
+
+ if (policy >= ARRAY_SIZE(netkit_policy_strings))
+ return inv;
+ return netkit_policy_strings[policy] ? : inv;
+}
+
+static const char *netkit_print_mode(__u32 mode)
+{
+ const char *inv = "UNKNOWN";
+
+ if (mode >= ARRAY_SIZE(netkit_mode_strings))
+ return inv;
+ return netkit_mode_strings[mode] ? : inv;
+}
+
+static void netkit_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
+{
+ if (!tb)
+ return;
+ if (tb[IFLA_NETKIT_MODE]) {
+ __u32 mode = rta_getattr_u32(tb[IFLA_NETKIT_MODE]);
+
+ print_string(PRINT_ANY, "mode", "mode %s ",
+ netkit_print_mode(mode));
+ }
+ if (tb[IFLA_NETKIT_PRIMARY]) {
+ __u8 primary = rta_getattr_u8(tb[IFLA_NETKIT_PRIMARY]);
+
+ print_string(PRINT_ANY, "type", "type %s ",
+ primary ? "primary" : "peer");
+ }
+ if (tb[IFLA_NETKIT_POLICY]) {
+ __u32 policy = rta_getattr_u32(tb[IFLA_NETKIT_POLICY]);
+
+ print_string(PRINT_ANY, "policy", "policy %s ",
+ netkit_print_policy(policy));
+ }
+}
+
+static void netkit_print_help(struct link_util *lu,
+ int argc, char **argv, FILE *f)
+{
+ explain(lu, f);
+}
+
+struct link_util netkit_link_util = {
+ .id = "netkit",
+ .maxattr = IFLA_NETKIT_MAX,
+ .parse_opt = netkit_parse_opt,
+ .print_opt = netkit_print_opt,
+ .print_help = netkit_print_help,
+};
projects / thirdparty / iproute2.git / commitdiff
