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networkd: introduce vxcan netdev. (#7150)

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Similar to the virtual ethernet driver veth, vxcan implements a
local CAN traffic tunnel between two virtual CAN network devices.
When creating a vxcan, two vxcan devices are created as pair
When one end receives the packet it appears on its pair and vice
versa. The vxcan can be used for cross namespace communication.
This commit is contained in:
Susant Sahani 2017-11-22 12:53:22 +05:30 committed by Zbigniew Jędrzejewski-Szmek
parent a217a4bcc5
commit d6df583c87
11 changed files with 173 additions and 0 deletions
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20
man/systemd.netdev.xml
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@ -180,6 +180,10 @@
<row><entry><varname>vcan</varname></entry>
<entry>The virtual CAN driver (vcan). Similar to the network loopback devices, vcan offers a virtual local CAN interface.</entry></row>
<row><entry><varname>vxcan</varname></entry>
<entry>The virtual CAN tunnel driver (vxcan). Similar to the virtual ethernet driver veth, vxcan implements a local CAN traffic tunnel between two virtual CAN network devices. When creating a vxcan, two vxcan devices are created as pair. When one end receives the packet it appears on its pair and vice versa. The vxcan can be used for cross namespace communication.
</entry></row>
</tbody>
</tgroup>
</table>
@ -894,6 +898,22 @@
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>[VXCAN] Section Options</title>
<para>The <literal>[VXCAN]</literal> section only applies for
netdevs of kind <literal>vxcan</literal> and accepts the
following key:</para>
<variablelist class='network-directives'>
<varlistentry>
<term><varname>Peer=</varname></term>
<listitem>
<para>The peer interface name used when creating the netdev.
This option is compulsory.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>[Tun] Section Options</title>

1
meson.build
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@ -427,6 +427,7 @@ foreach decl : [['IFLA_INET6_ADDR_GEN_MODE', 'linux/if_link.h'],
['IFA_FLAGS', 'linux/if_addr.h'],
['FRA_UID_RANGE', 'linux/fib_rules.h'],
['LO_FLAGS_PARTSCAN', 'linux/loop.h'],
['VXCAN_INFO_PEER', 'linux/can/vxcan.h'],
]
prefix = decl.length() > 2 ? decl[2] : ''
have = cc.has_header_symbol(decl[1], decl[0], prefix : prefix)

4
src/basic/missing.h
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@ -956,6 +956,10 @@ struct input_mask {
#define IFLA_VRF_TABLE 1
#endif
#if !HAVE_VXCAN_INFO_PEER
#define VXCAN_INFO_PEER 1
#endif
#if !HAVE_NDA_IFINDEX
#define NDA_UNSPEC 0
#define NDA_DST 1

12
src/libsystemd/sd-netlink/netlink-types.c
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@ -37,6 +37,10 @@
#include <linux/if_tunnel.h>
#include <linux/fib_rules.h>
#if HAVE_VXCAN_INFO_PEER
#include <linux/can/vxcan.h>
#endif
#include "macro.h"
#include "missing.h"
#include "netlink-types.h"
@ -92,6 +96,10 @@ static const NLType rtnl_link_info_data_veth_types[] = {
[VETH_INFO_PEER] = { .type = NETLINK_TYPE_NESTED, .type_system = &rtnl_link_type_system, .size = sizeof(struct ifinfomsg) },
};
static const NLType rtnl_link_info_data_vxcan_types[] = {
[VXCAN_INFO_PEER] = { .type = NETLINK_TYPE_NESTED, .type_system = &rtnl_link_type_system, .size = sizeof(struct ifinfomsg) },
};
static const NLType rtnl_link_info_data_ipvlan_types[] = {
[IFLA_IPVLAN_MODE] = { .type = NETLINK_TYPE_U16 },
};
@ -328,6 +336,8 @@ static const char* const nl_union_link_info_data_table[] = {
[NL_UNION_LINK_INFO_DATA_VRF] = "vrf",
[NL_UNION_LINK_INFO_DATA_VCAN] = "vcan",
[NL_UNION_LINK_INFO_DATA_GENEVE] = "geneve",
[NL_UNION_LINK_INFO_DATA_VXCAN] = "vxcan",
};
DEFINE_STRING_TABLE_LOOKUP(nl_union_link_info_data, NLUnionLinkInfoData);
@ -371,6 +381,8 @@ static const NLTypeSystem rtnl_link_info_data_type_systems[] = {
.types = rtnl_link_info_data_vrf_types },
[NL_UNION_LINK_INFO_DATA_GENEVE] = { .count = ELEMENTSOF(rtnl_link_info_data_geneve_types),
.types = rtnl_link_info_data_geneve_types },
[NL_UNION_LINK_INFO_DATA_VXCAN] = { .count = ELEMENTSOF(rtnl_link_info_data_vxcan_types),
.types = rtnl_link_info_data_vxcan_types },
};
static const NLTypeSystemUnion rtnl_link_info_data_type_system_union = {

1
src/libsystemd/sd-netlink/netlink-types.h
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@ -90,6 +90,7 @@ typedef enum NLUnionLinkInfoData {
NL_UNION_LINK_INFO_DATA_VRF,
NL_UNION_LINK_INFO_DATA_VCAN,
NL_UNION_LINK_INFO_DATA_GENEVE,
NL_UNION_LINK_INFO_DATA_VXCAN,
_NL_UNION_LINK_INFO_DATA_MAX,
_NL_UNION_LINK_INFO_DATA_INVALID = -1
} NLUnionLinkInfoData;

2
src/network/meson.build
View File

@ -44,6 +44,8 @@ sources = files('''
netdev/vxlan.h
netdev/geneve.c
netdev/geneve.h
netdev/vxcan.c
netdev/vxcan.h
networkd-address-label.c
networkd-address-label.h
networkd-address-pool.c

2
src/network/netdev/netdev-gperf.gperf
View File

@ -17,6 +17,7 @@ _Pragma("GCC diagnostic ignored \"-Wimplicit-fallthrough\"")
#include "netdev/vxlan.h"
#include "netdev/vrf.h"
#include "netdev/netdev.h"
#include "netdev/vxcan.h"
#include "vlan-util.h"
%}
struct ConfigPerfItem;
@ -62,6 +63,7 @@ Tunnel.EncapsulationLimit, config_parse_encap_limit, 0,
Tunnel.Independent, config_parse_bool, 0, offsetof(Tunnel, independent)
Peer.Name, config_parse_ifname, 0, offsetof(Veth, ifname_peer)
Peer.MACAddress, config_parse_hwaddr, 0, offsetof(Veth, mac_peer)
VXCAN.Peer, config_parse_ifname, 0, offsetof(VxCan, ifname_peer)
VXLAN.Id, config_parse_uint64, 0, offsetof(VxLan, id)
VXLAN.Group, config_parse_vxlan_address, 0, offsetof(VxLan, remote)
VXLAN.Local, config_parse_vxlan_address, 0, offsetof(VxLan, local)

3
src/network/netdev/netdev.c
View File

@ -48,6 +48,7 @@
#include "netdev/dummy.h"
#include "netdev/vrf.h"
#include "netdev/vcan.h"
#include "netdev/vxcan.h"
const NetDevVTable * const netdev_vtable[_NETDEV_KIND_MAX] = {
[NETDEV_KIND_BRIDGE] = &bridge_vtable,
@ -73,6 +74,7 @@ const NetDevVTable * const netdev_vtable[_NETDEV_KIND_MAX] = {
[NETDEV_KIND_VRF] = &vrf_vtable,
[NETDEV_KIND_VCAN] = &vcan_vtable,
[NETDEV_KIND_GENEVE] = &geneve_vtable,
[NETDEV_KIND_VXCAN] = &vxcan_vtable,
};
static const char* const netdev_kind_table[_NETDEV_KIND_MAX] = {
@ -99,6 +101,7 @@ static const char* const netdev_kind_table[_NETDEV_KIND_MAX] = {
[NETDEV_KIND_VRF] = "vrf",
[NETDEV_KIND_VCAN] = "vcan",
[NETDEV_KIND_GENEVE] = "geneve",
[NETDEV_KIND_VXCAN] = "vxcan",
};
DEFINE_STRING_TABLE_LOOKUP(netdev_kind, NetDevKind);

1
src/network/netdev/netdev.h
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@ -59,6 +59,7 @@ typedef enum NetDevKind {
NETDEV_KIND_VRF,
NETDEV_KIND_VCAN,
NETDEV_KIND_GENEVE,
NETDEV_KIND_VXCAN,
_NETDEV_KIND_MAX,
_NETDEV_KIND_INVALID = -1
} NetDevKind;

89
src/network/netdev/vxcan.c Normal file
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@ -0,0 +1,89 @@
/***
This file is part of systemd.
Copyright 2017 Susant Sahani
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include "netdev/vxcan.h"
#include "missing.h"
static int netdev_vxcan_fill_message_create(NetDev *netdev, Link *link, sd_netlink_message *m) {
VxCan *v;
int r;
assert(netdev);
assert(!link);
assert(m);
v = VXCAN(netdev);
assert(v);
r = sd_netlink_message_open_container(m, VXCAN_INFO_PEER);
if (r < 0)
return log_netdev_error_errno(netdev, r, "Could not append VXCAN_INFO_PEER attribute: %m");
if (v->ifname_peer) {
r = sd_netlink_message_append_string(m, IFLA_IFNAME, v->ifname_peer);
if (r < 0)
return log_error_errno(r, "Failed to add vxcan netlink interface peer name: %m");
}
r = sd_netlink_message_close_container(m);
if (r < 0)
return log_netdev_error_errno(netdev, r, "Could not append VXCAN_INFO_PEER attribute: %m");
return r;
}
static int netdev_vxcan_verify(NetDev *netdev, const char *filename) {
VxCan *v;
assert(netdev);
assert(filename);
v = VXCAN(netdev);
assert(v);
if (!v->ifname_peer) {
log_warning("VxCan NetDev without peer name configured in %s. Ignoring", filename);
return -EINVAL;
}
return 0;
}
static void vxcan_done(NetDev *n) {
VxCan *v;
assert(n);
v = VXCAN(n);
assert(v);
free(v->ifname_peer);
}
const NetDevVTable vxcan_vtable = {
.object_size = sizeof(VxCan),
.sections = "Match\0NetDev\0VXCAN\0",
.done = vxcan_done,
.fill_message_create = netdev_vxcan_fill_message_create,
.create_type = NETDEV_CREATE_INDEPENDENT,
.config_verify = netdev_vxcan_verify,
};

38
src/network/netdev/vxcan.h Normal file
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@ -0,0 +1,38 @@
#pragma once
/***
This file is part of systemd.
Copyright 2017 Susant Sahani
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
typedef struct VxCan VxCan;
#if HAVE_VXCAN_INFO_PEER
#include <linux/can/vxcan.h>
#endif
#include "netdev/netdev.h"
struct VxCan {
NetDev meta;
char *ifname_peer;
};
DEFINE_NETDEV_CAST(VXCAN, VxCan);
extern const NetDevVTable vxcan_vtable;