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// 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,
};
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