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/* SPDX-License-Identifier: GPL-2.0-or-later */
/* iplink_vrf.c VRF device support
*
* Authors: Shrijeet Mukherjee <shm@cumulusnetworks.com>
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <linux/if_link.h>
#include <errno.h>
#include "rt_names.h"
#include "utils.h"
#include "ip_common.h"
static void vrf_explain(FILE *f)
{
fprintf(f, "Usage: ... vrf table TABLEID\n");
}
static void explain(void)
{
vrf_explain(stderr);
}
static int vrf_parse_opt(struct link_util *lu, int argc, char **argv,
struct nlmsghdr *n)
{
while (argc > 0) {
if (matches(*argv, "table") == 0) {
__u32 table;
NEXT_ARG();
if (rtnl_rttable_a2n(&table, *argv))
invarg("invalid table ID\n", *argv);
addattr32(n, 1024, IFLA_VRF_TABLE, table);
} else if (matches(*argv, "help") == 0) {
explain();
return -1;
} else {
fprintf(stderr, "vrf: unknown option \"%s\"?\n",
*argv);
explain();
return -1;
}
argc--, argv++;
}
return 0;
}
static void vrf_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
{
if (!tb)
return;
if (tb[IFLA_VRF_TABLE])
print_uint(PRINT_ANY,
"table",
"table %u ",
rta_getattr_u32(tb[IFLA_VRF_TABLE]));
}
static void vrf_slave_print_opt(struct link_util *lu, FILE *f,
struct rtattr *tb[])
{
if (!tb)
return;
if (tb[IFLA_VRF_PORT_TABLE]) {
print_uint(PRINT_ANY,
"table",
"table %u ",
rta_getattr_u32(tb[IFLA_VRF_PORT_TABLE]));
}
}
static void vrf_print_help(struct link_util *lu, int argc, char **argv,
FILE *f)
{
vrf_explain(f);
}
struct link_util vrf_link_util = {
.id = "vrf",
.maxattr = IFLA_VRF_MAX,
.parse_opt = vrf_parse_opt,
.print_opt = vrf_print_opt,
.print_help = vrf_print_help,
};
struct link_util vrf_slave_link_util = {
.id = "vrf_slave",
.maxattr = IFLA_VRF_PORT_MAX,
.print_opt = vrf_slave_print_opt,
};
/* returns table id if name is a VRF device */
__u32 ipvrf_get_table(const char *name)
{
struct {
struct nlmsghdr n;
struct ifinfomsg i;
char buf[1024];
} req = {
.n = {
.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
.nlmsg_flags = NLM_F_REQUEST,
.nlmsg_type = RTM_GETLINK,
},
.i = {
.ifi_family = preferred_family,
},
};
struct nlmsghdr *answer;
struct rtattr *tb[IFLA_MAX+1];
struct rtattr *li[IFLA_INFO_MAX+1];
struct rtattr *vrf_attr[IFLA_VRF_MAX + 1];
struct ifinfomsg *ifi;
__u32 tb_id = 0;
int len;
addattr_l(&req.n, sizeof(req), IFLA_IFNAME, name, strlen(name) + 1);
if (rtnl_talk_suppress_rtnl_errmsg(&rth, &req.n, &answer) < 0) {
/* special case "default" vrf to be the main table */
if (errno == ENODEV && !strcmp(name, "default"))
if (rtnl_rttable_a2n(&tb_id, "main"))
fprintf(stderr,
"BUG: RTTable \"main\" not found.\n");
return tb_id;
}
ifi = NLMSG_DATA(answer);
len = answer->nlmsg_len - NLMSG_LENGTH(sizeof(*ifi));
if (len < 0) {
fprintf(stderr, "BUG: Invalid response to link query.\n");
goto out;
}
parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), len);
if (!tb[IFLA_LINKINFO])
goto out;
parse_rtattr_nested(li, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);
if (!li[IFLA_INFO_KIND] || !li[IFLA_INFO_DATA])
goto out;
if (strcmp(RTA_DATA(li[IFLA_INFO_KIND]), "vrf"))
goto out;
parse_rtattr_nested(vrf_attr, IFLA_VRF_MAX, li[IFLA_INFO_DATA]);
if (vrf_attr[IFLA_VRF_TABLE])
tb_id = rta_getattr_u32(vrf_attr[IFLA_VRF_TABLE]);
if (!tb_id)
fprintf(stderr, "BUG: VRF %s is missing table id\n", name);
out:
free(answer);
return tb_id;
}
int name_is_vrf(const char *name)
{
struct {
struct nlmsghdr n;
struct ifinfomsg i;
char buf[1024];
} req = {
.n = {
.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
.nlmsg_flags = NLM_F_REQUEST,
.nlmsg_type = RTM_GETLINK,
},
.i = {
.ifi_family = preferred_family,
},
};
struct nlmsghdr *answer;
struct rtattr *tb[IFLA_MAX+1];
struct rtattr *li[IFLA_INFO_MAX+1];
struct ifinfomsg *ifi;
int ifindex = 0;
int len;
addattr_l(&req.n, sizeof(req), IFLA_IFNAME, name, strlen(name) + 1);
if (rtnl_talk_suppress_rtnl_errmsg(&rth, &req.n, &answer) < 0)
return 0;
ifi = NLMSG_DATA(answer);
len = answer->nlmsg_len - NLMSG_LENGTH(sizeof(*ifi));
if (len < 0) {
fprintf(stderr, "BUG: Invalid response to link query.\n");
goto out;
}
parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), len);
if (!tb[IFLA_LINKINFO])
goto out;
parse_rtattr_nested(li, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);
if (!li[IFLA_INFO_KIND])
goto out;
if (strcmp(RTA_DATA(li[IFLA_INFO_KIND]), "vrf"))
goto out;
ifindex = ifi->ifi_index;
out:
free(answer);
return ifindex;
}
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