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networkd: Add support to configure ISATAP tunnel

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Let's just reuse the code of sit tunnel to create a ISATAP tunnel.
Matter of turning a flag

Please see https://elixir.bootlin.com/linux/v4.19.6/source/net/ipv6/sit.c#L208
This commit is contained in:
Susant Sahani 2018-12-01 18:21:20 +05:30
parent b2ac2b01c8
commit 918049ad53
5 changed files with 22 additions and 0 deletions
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7
man/systemd.netdev.xml
View file

@ -924,6 +924,13 @@
applicable to SIT tunnels.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>ISATAP=</varname></term>
<listitem>
<para>Takes a boolean. If set, configures the tunnel as Intra-Site Automatic Tunnel Addressing Protocol (ISATAP) tunnel.
Only applicable to SIT tunnels. When unset, the kernel's default will be used.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>SerializeTunneledPackets=</varname></term>
<listitem>

1
src/network/netdev/netdev-gperf.gperf
View file

@ -73,6 +73,7 @@ Tunnel.Encapsulation, config_parse_fou_encap_type, 0,
Tunnel.IPv6RapidDeploymentPrefix, config_parse_6rd_prefix, 0, 0
Tunnel.ERSPANIndex, config_parse_uint32, 0, offsetof(Tunnel, erspan_index)
Tunnel.SerializeTunneledPackets, config_parse_tristate, 0, offsetof(Tunnel, erspan_sequence)
Tunnel.ISATAP, config_parse_tristate, 0, offsetof(Tunnel, isatap)
FooOverUDP.Protocol, config_parse_uint8, 0, offsetof(FouTunnel, fou_protocol)
FooOverUDP.Encapsulation, config_parse_fou_encap_type, 0, offsetof(FouTunnel, fou_encap_type)
FooOverUDP.Port, config_parse_ip_port, 0, offsetof(FouTunnel, port)

12
src/network/netdev/tunnel.c
View file

@ -118,6 +118,7 @@ static int netdev_sit_fill_message_create(NetDev *netdev, Link *link, sd_netlink
r = sd_netlink_message_append_in6_addr(m, IFLA_IPTUN_6RD_PREFIX, &t->sixrd_prefix);
if (r < 0)
return log_netdev_error_errno(netdev, r, "Could not append IFLA_IPTUN_6RD_PREFIX attribute: %m");
/* u16 is deliberate here, even though we're passing a netmask that can never be >128. The kernel is
* expecting to receive the prefixlen as a u16.
*/
@ -126,6 +127,16 @@ static int netdev_sit_fill_message_create(NetDev *netdev, Link *link, sd_netlink
return log_netdev_error_errno(netdev, r, "Could not append IFLA_IPTUN_6RD_PREFIXLEN attribute: %m");
}
if (t->isatap >= 0) {
uint16_t flags = 0;
SET_FLAG(flags, SIT_ISATAP, t->isatap);
r = sd_netlink_message_append_u16(m, IFLA_IPTUN_FLAGS, flags);
if (r < 0)
return log_netdev_error_errno(netdev, r, "Could not append IFLA_IPTUN_FLAGS attribute: %m");
}
return r;
}
@ -761,6 +772,7 @@ static void sit_init(NetDev *n) {
assert(t);
t->pmtudisc = true;
t->isatap = -1;
}
static void vti_init(NetDev *n) {

1
src/network/netdev/tunnel.h
View file

@ -30,6 +30,7 @@ typedef struct Tunnel {
int ipv6_flowlabel;
int allow_localremote;
int erspan_sequence;
int isatap;
unsigned ttl;
unsigned tos;

1
test/fuzz/fuzz-netdev-parser/directives.netdev
View file

@ -76,6 +76,7 @@ FOUSourcePort=
IPv6RapidDeploymentPrefix=
ERSPANIndex=
SerializeTunneledPackets=
ISATAP=
[VXLAN]
UDP6ZeroChecksumRx=
ARPProxy=