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network: xfrm: refuse zero interface ID

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Since kernel 5.17-rc1, 5.16.3, and 5.15.17 (more specifically,
8dce439195)
the kernel refuses to create an xfrm interface with zero ID.
This commit is contained in:
Yu Watanabe 2022-02-01 13:00:51 +09:00
parent 04660b10d3
commit fd11005951
2 changed files with 20 additions and 1 deletions
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2
man/systemd.netdev.xml
View file

@ -1994,7 +1994,7 @@
<term><varname>InterfaceId=</varname></term>
<listitem>
<para>Sets the ID/key of the xfrm interface which needs to be associated with a SA/policy.
Can be decimal or hexadecimal, valid range is 0-0xffffffff, defaults to 0.</para>
Can be decimal or hexadecimal, valid range is 1-0xffffffff. This is mandatory.</para>
</listitem>
</varlistentry>
<varlistentry>

19
src/network/netdev/xfrm.c
View file

@ -14,6 +14,7 @@ static int xfrm_fill_message_create(NetDev *netdev, Link *link, sd_netlink_messa
x = XFRM(netdev);
assert(x);
assert(link || x->independent);
r = sd_netlink_message_append_u32(message, IFLA_XFRM_LINK, link ? link->ifindex : LOOPBACK_IFINDEX);
@ -27,10 +28,28 @@ static int xfrm_fill_message_create(NetDev *netdev, Link *link, sd_netlink_messa
return 0;
}
static int xfrm_verify(NetDev *netdev, const char *filename) {
Xfrm *x;
assert(netdev);
assert(filename);
x = XFRM(netdev);
assert(x);
if (x->if_id == 0)
return log_netdev_warning_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
"%s: Xfrm interface ID cannot be zero.", filename);
return 0;
}
const NetDevVTable xfrm_vtable = {
.object_size = sizeof(Xfrm),
.sections = NETDEV_COMMON_SECTIONS "Xfrm\0",
.fill_message_create = xfrm_fill_message_create,
.config_verify = xfrm_verify,
.create_type = NETDEV_CREATE_STACKED,
.iftype = ARPHRD_NONE,
};