Since commit a8f820a380a2a06 ('can: add Virtual CAN Tunnel driver (vxcan)')
for Linux 4.12 a virtual CAN tunnel driver analogue to veth is available in
Linux.
This patch adds the ability to create vxcan device pairs.
Signed-off-by: Oliver Hartkopp <socket...@hartkopp.net>
---
include/linux/can/vxcan.h | 12 ++++++
ip/Makefile | 2 +-
ip/iplink_vxcan.c | 99 +++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 112 insertions(+), 1 deletion(-)
create mode 100644 include/linux/can/vxcan.h
create mode 100644 ip/iplink_vxcan.c
diff --git a/include/linux/can/vxcan.h b/include/linux/can/vxcan.h
new file mode 100644
index 00000000..ffb0b715
--- /dev/null
+++ b/include/linux/can/vxcan.h
@@ -0,0 +1,12 @@
+#ifndef _UAPI_CAN_VXCAN_H
+#define _UAPI_CAN_VXCAN_H
+
+enum {
+ VXCAN_INFO_UNSPEC,
+ VXCAN_INFO_PEER,
+
+ __VXCAN_INFO_MAX
+#define VXCAN_INFO_MAX (__VXCAN_INFO_MAX - 1)
+};
+
+#endif
diff --git a/ip/Makefile b/ip/Makefile
index e08c170a..8424b1f6 100644
--- a/ip/Makefile
+++ b/ip/Makefile
@@ -2,7 +2,7 @@ IPOBJ=ip.o ipaddress.o ipaddrlabel.o iproute.o iprule.o
ipnetns.o \
rtm_map.o iptunnel.o ip6tunnel.o tunnel.o ipneigh.o ipntable.o iplink.o \
ipmaddr.o ipmonitor.o ipmroute.o ipprefix.o iptuntap.o iptoken.o \
ipxfrm.o xfrm_state.o xfrm_policy.o xfrm_monitor.o iplink_dummy.o \
- iplink_ifb.o iplink_nlmon.o iplink_team.o iplink_vcan.o \
+ iplink_ifb.o iplink_nlmon.o iplink_team.o iplink_vcan.o iplink_vxcan.o \
iplink_vlan.o link_veth.o link_gre.o iplink_can.o iplink_xdp.o \
iplink_macvlan.o ipl2tp.o link_vti.o link_vti6.o \
iplink_vxlan.o tcp_metrics.o iplink_ipoib.o ipnetconf.o link_ip6tnl.o \
diff --git a/ip/iplink_vxcan.c b/ip/iplink_vxcan.c
new file mode 100644
index 00000000..680f640f
--- /dev/null
+++ b/ip/iplink_vxcan.c
@@ -0,0 +1,99 @@
+/*
+ * iplink_vxcan.c vxcan device support (Virtual CAN Tunnel)
+ *
+ * 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.
+ *
+ * Author: Oliver Hartkopp <socket...@hartkopp.net>
+ * Based on: link_veth.c from Pavel Emelianov <xe...@openvz.org>
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <net/if.h>
+#include <linux/can/vxcan.h>
+
+#include "utils.h"
+#include "ip_common.h"
+
+static void print_usage(FILE *f)
+{
+ printf("Usage: ip link <options> type vxcan [peer <options>]\n"
+ "To get <options> type 'ip link add help'\n");
+}
+
+static void usage(void)
+{
+ print_usage(stderr);
+}
+
+static int vxcan_parse_opt(struct link_util *lu, int argc, char **argv,
+ struct nlmsghdr *hdr)
+{
+ char *dev = NULL;
+ char *name = NULL;
+ char *link = NULL;
+ char *type = NULL;
+ int index = 0;
+ int err, len;
+ struct rtattr *data;
+ int group;
+ struct ifinfomsg *ifm, *peer_ifm;
+ unsigned int ifi_flags, ifi_change;
+
+ if (strcmp(argv[0], "peer") != 0) {
+ usage();
+ return -1;
+ }
+
+ ifm = NLMSG_DATA(hdr);
+ ifi_flags = ifm->ifi_flags;
+ ifi_change = ifm->ifi_change;
+ ifm->ifi_flags = 0;
+ ifm->ifi_change = 0;
+
+ data = NLMSG_TAIL(hdr);
+ addattr_l(hdr, 1024, VXCAN_INFO_PEER, NULL, 0);
+
+ hdr->nlmsg_len += sizeof(struct ifinfomsg);
+
+ err = iplink_parse(argc - 1, argv + 1, (struct iplink_req *)hdr,
+ &name, &type, &link, &dev, &group, &index);
+ if (err < 0)
+ return err;
+
+ if (name) {
+ len = strlen(name) + 1;
+ if (len > IFNAMSIZ)
+ invarg("\"name\" too long\n", *argv);
+ addattr_l(hdr, 1024, IFLA_IFNAME, name, len);
+ }
+
+ peer_ifm = RTA_DATA(data);
+ peer_ifm->ifi_index = index;
+ peer_ifm->ifi_flags = ifm->ifi_flags;
+ peer_ifm->ifi_change = ifm->ifi_change;
+ ifm->ifi_flags = ifi_flags;
+ ifm->ifi_change = ifi_change;
+
+ if (group != -1)
+ addattr32(hdr, 1024, IFLA_GROUP, group);
+
+ data->rta_len = (void *)NLMSG_TAIL(hdr) - (void *)data;
+ return argc - 1 - err;
+}
+
+static void vxcan_print_help(struct link_util *lu, int argc, char **argv,
+ FILE *f)
+{
+ print_usage(f);
+}
+
+struct link_util vxcan_link_util = {
+ .id = "vxcan",
+ .parse_opt = vxcan_parse_opt,
+ .print_help = vxcan_print_help,
+};
--
2.11.0
