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-rw-r--r--ip/link_xfrm.c101
1 files changed, 101 insertions, 0 deletions
diff --git a/ip/link_xfrm.c b/ip/link_xfrm.c
new file mode 100644
index 0000000..d76398c
--- /dev/null
+++ b/ip/link_xfrm.c
@@ -0,0 +1,101 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * link_xfrm.c Virtual XFRM Interface driver module
+ *
+ * Authors: Matt Ellison <matt@arroyo.io>
+ */
+
+#include <string.h>
+#include <linux/if_link.h>
+
+#include "rt_names.h"
+#include "utils.h"
+#include "ip_common.h"
+#include "tunnel.h"
+
+static void xfrm_print_help(struct link_util *lu, int argc, char **argv,
+ FILE *f)
+{
+ fprintf(f,
+ "Usage: ... %-4s dev [ PHYS_DEV ] [ if_id IF-ID ]\n"
+ " [ external ]\n"
+ "\n"
+ "Where: IF-ID := { 0x1..0xffffffff }\n",
+ lu->id);
+}
+
+static int xfrm_parse_opt(struct link_util *lu, int argc, char **argv,
+ struct nlmsghdr *n)
+{
+ unsigned int link = 0;
+ bool metadata = false;
+ __u32 if_id = 0;
+
+ while (argc > 0) {
+ if (!matches(*argv, "dev")) {
+ NEXT_ARG();
+ link = ll_name_to_index(*argv);
+ if (!link)
+ exit(nodev(*argv));
+ } else if (!matches(*argv, "if_id")) {
+ NEXT_ARG();
+ if (get_u32(&if_id, *argv, 0))
+ invarg("if_id value is invalid", *argv);
+ else if (!if_id)
+ invarg("if_id value is invalid", *argv);
+ else
+ addattr32(n, 1024, IFLA_XFRM_IF_ID, if_id);
+ } else if (!strcmp(*argv, "external")) {
+ metadata = true;
+ } else {
+ xfrm_print_help(lu, argc, argv, stderr);
+ return -1;
+ }
+ argc--; argv++;
+ }
+
+ if (metadata) {
+ if (if_id || link) {
+ fprintf(stderr, "xfrmi: both 'external' and if_id/link cannot be specified\n");
+ return -1;
+ }
+ addattr(n, 1024, IFLA_XFRM_COLLECT_METADATA);
+ return 0;
+ }
+
+ if (!if_id)
+ missarg("IF_ID");
+
+ if (link)
+ addattr32(n, 1024, IFLA_XFRM_LINK, link);
+
+ return 0;
+}
+
+static void xfrm_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
+{
+
+ if (!tb)
+ return;
+
+ if (tb[IFLA_XFRM_COLLECT_METADATA]) {
+ print_bool(PRINT_ANY, "external", "external ", true);
+ return;
+ }
+
+ if (tb[IFLA_XFRM_IF_ID]) {
+ __u32 id = rta_getattr_u32(tb[IFLA_XFRM_IF_ID]);
+
+ print_0xhex(PRINT_ANY, "if_id", "if_id %#llx ", id);
+
+ }
+
+}
+
+struct link_util xfrm_link_util = {
+ .id = "xfrm",
+ .maxattr = IFLA_XFRM_MAX,
+ .parse_opt = xfrm_parse_opt,
+ .print_opt = xfrm_print_opt,
+ .print_help = xfrm_print_help,
+};