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device: support IPv6 EUI64 link-local address for ipv6 tunnels

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Currently, if a IPv6 tunnel device is configured to use an EUI64
link-local address (via per-connection or global configuration), the
IPv6 configuration fails because NM cannot determine an interface
identifier.

Generate the interface identifier use the same mechanism [1] as
kernel, which relies on the fake "permanent" address and treats the
interface as Ethernet.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/net/ipv6/addrconf.c?h=v6.11#n2364

Fixes-test: @iptunnel_ip6gre_create_device

https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/merge_requests/2065
(cherry picked from commit 2932825952)
This commit is contained in:
Beniamino Galvani 2024-11-02 21:03:38 +01:00
parent 429a4d1996
commit 33f6099845
1 changed files with 16 additions and 0 deletions
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16
src/core/devices/nm-device.c
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@ -5403,6 +5403,7 @@ get_ip_iface_identifier(NMDevice *self, NMUtilsIPv6IfaceId *out_iid)
NMDevicePrivate *priv = NM_DEVICE_GET_PRIVATE(self);
NMPlatform *platform = nm_device_get_platform(self);
const NMPlatformLink *pllink;
NMPLinkAddress permanent_hwaddr;
NMLinkType link_type;
const guint8 *hwaddr;
guint8 pseudo_hwaddr[ETH_ALEN];
@ -5446,6 +5447,21 @@ get_ip_iface_identifier(NMDevice *self, NMUtilsIPv6IfaceId *out_iid)
hwaddr_len = G_N_ELEMENTS(pseudo_hwaddr);
link_type = NM_LINK_TYPE_ETHERNET;
}
} else if (NM_IN_SET(pllink->type,
NM_LINK_TYPE_VTI6,
NM_LINK_TYPE_IP6TNL,
NM_LINK_TYPE_IP6GRE)) {
/* Use the "permanent" 48-bit address to construct a EUI64
* according to RFC 4291 Appendix A. */
if (!nm_platform_link_get_permanent_address(platform, pllink, &permanent_hwaddr))
return FALSE;
if (permanent_hwaddr.len < ETH_ALEN)
return FALSE;
memcpy(pseudo_hwaddr, permanent_hwaddr.data, ETH_ALEN);
hwaddr = pseudo_hwaddr;
hwaddr_len = ETH_ALEN;
link_type = NM_LINK_TYPE_ETHERNET;
}
success = nm_utils_get_ipv6_interface_identifier(link_type,