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-rw-r--r--ip/iplink_vrf.c226
1 files changed, 226 insertions, 0 deletions
diff --git a/ip/iplink_vrf.c b/ip/iplink_vrf.c
new file mode 100644
index 0000000..5d20f29
--- /dev/null
+++ b/ip/iplink_vrf.c
@@ -0,0 +1,226 @@
+/* iplink_vrf.c VRF device support
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * 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;
+}