The function `sid_exist` verifies if a given SRv6 SID has already been
allocated for a given IS-IS area. This commit extends `sid_exist` to
also consider adjacency SIDs when checking for the existence of the SID.
An SRv6 adjacency SID is a SID that is associated with a particular
adjacency. Adjacency SIDs are advertised using the SRv6 End.X SID
Sub-TLV (RFC 9352 section #8.1) or SRv6 LAN End.X SID Sub-TLV (RFC 9352
section #8.2).
This commit defines the following Adj SIDs management functions:
* srv6_endx_sid_add_single: add a new SRv6 Adjacency SID
* srv6_endx_sid_del: delete an SRv6 Adjacency SID
* isis_srv6_endx_sid_find: lookup SRv6 End.X SID by type
It also attaches some callbacks to the hooks isis_adj_state_change_hook,
isis_adj_ip_enabled_hook, isis_adj_ip_disabled_hook, which are
responsible for installing/removing an SRv6 Adjacency SID automatically
when the state of an IS-IS adjacency changes.
An SRv6 adjacency SID is a SID that is associated with a particular
adjacency. Adjacency SIDs are advertised using the SRv6 End.X SID
Sub-TLV (RFC 9352 section #8.1) or SRv6 LAN End.X SID Sub-TLV (RFC 9352
section #8.2).
This commit defines a data structure `srv6_adjacency` for storing
information about an SRv6 Adjacency SID. This data structure will be
used to support SRv6 Adjacency SIDs functionalities in future commits.
We need to allocate memory SRv6 SID Structure Sub-Sub-TLV in
isis_srv6.c. MTYPE_ISIS_SUBSUBTLV is statically defined in isis_tlvs.c
and therefore is not visible in isis_srv6.c. Let's make
MTYPE_ISIS_SUBSUBTLV non-static to provide visibility to the external
world..
Add SRv6 End.X SID Sub-TLV and SRv6 LAN End.X SID Sub-TLV codepoints
(defined in "IS-IS Sub-TLVs for TLVs Advertising Neighbor Information"
IANA registry). These codepoints will be used in future commits to
pack/unpack corresponding Sub-TLVs.
SRv6 End.X SID Sub-TLV (RFC 9352 section #8.1) and SRv6 LAN End.X SID
Sub-TLV (RFC 9352 section #8.2) contain a `flag` field. Currently, three
flags are defined:
* B-Flag: Backup flag
* S-Flag: Set flag
* P-Flag: Persistent flag
This commit defines three constants representing these flags.
isisd: Add SRv6 End.X SID to IS ext reach Sub-TLVs
Add SRv6 End.X SID Sub-TLV and SRv6 LAN End.X SID Sub-TLV to the
Extended IS Reachability Sub-TLVs data structure and perform proper
initialization/free when the Sub-TLVs data structure is
allocated/destroyed.
According to RFC 9352 section #5, the SRv6 Locators associated with
algorithms 0 and 1 should be also advertised in a Prefix Reachability
TLV (236 or 237) to allow legacy routers (i.e., routers that do not
support SRv6) installing a forwarding entry for algorithms 0 and 1 SRv6
traffic.
This commits extend IS-IS to advertise SRv6 Locators in IPv6
Reachability TLV.
Add a function to build an SRv6 SID Structure Sub-Sub-TLV (RFC 9352
section #9) to advertise the structure of a specific SRv6 End SID passed
as an argument.
General Sub-Sub-TLV processing functions (i.e., copy, format, free,
pack, and unpack) perform a lookup of the handler specific for a
Sub-Sub-TLV in the `tlv_table`, and then call the specific handler to
process the Sub-Sub-TLV.
This commit adds the handlers for the SRv6 Structure Sub-Sub-TLV (stored
in `subsubtlv_srv6_sid_structure_ops`) to the `tlv_table`.
Add a function to pack all the Sub-Sub-TLVs passed as an argument.
At this time, this function does not pack any Sub-Sub-TLVs because no
Sub-Sub-TLVs have been defined yet. This function will be extended in
future commits to pack specific Sub-Sub-TLVs, as they become supported.
Add a function to free all the Sub-Sub-TLVs and the `isis_subsubtlvs`
data structure passed as an argument.
At this time, this function only frees the `isis_subsubtlvs`. It does
not free any specific Sub-Sub-TLVs because no Sub-Sub-TLVs have been
defined yet. This function will be extended in future commits to free
specific Sub-Sub-TLVs, as they become supported.
isisd: Add format func for Sub-Sub-TLVs in general
Add a function to return information about all the Sub-Sub-TLVs passed
as an argument.
At this time, this function does nothing because no Sub-Sub-TLVs have
been defined yet. This function will be extended in
future commits to return information about specific Sub-Sub-TLVs,
as they become supported.
Add a function to copy all the Sub-Sub-TLVs passed as an argument.
At this time, this function does not copy any Sub-Sub-TLVs because no
Sub-Sub-TLVs have been defined yet. This function will be extended in
future commits to copy specific Sub-Sub-TLVs, as they become supported.
Add a data structure to store IS-IS Sub-Sub-TLVs information. At this
time, does not contain any Sub-Sub-TLV information because no
Sub-Sub-TLVs have been defined yet. This data structure will be extended
in future commits to store specific Sub-Sub-TLVs, as they become
supported.
General Sub-TLV processing functions (i.e., copy, format, free, pack,
and unpack) perform a lookup of the specific handler for a Sub-TLV in
the `tlv_table`, and then call the specific handler to process the
Sub-TLV.
This commit adds the handlers for the SRv6 End SID Sub-TLV (stored in
`tlv_srv6_end_sid_ops`) to the `tlv_table`.
Add a new TLV context value for the SRv6 End SID Sub-TLV. It will be
needed to support unpacking of the Sub-Sub-TLVs of the SRv6 End SID
Sub-TLV in future commits.
isisd: Decode MTID when unpacking SRv6 Locator TLV
The SRv6 Locator TLV (RFC 9352 section #7.1) starts with the MTID field.
Let's expect the MTID as the first field when we are unpacking an SRv6
Locator TLV.
The SRv6 Locator TLV (RFC 9352 section #7.1) starts with the MTID field.
Let's put the MTID as the first field when we are packing an SRv6
Locator TLV.
isisd: Bind SRv6 Locator TLV ops to IS-IS TLV type
General TLV processing functions (i.e., copy, format, free, pack, and
unpack) perform a lookup of the specific handler for a TLV in the
`tlv_table`, and then call the specific handler to process the TLV.
This commit adds the handlers for the SRv6 Locator TLV (stored in
`tlv_srv6_locator_ops`) to the `tlv_table`.
Add the `IS-IS SRv6 SID Structure Sub-Sub-TLV Codepoint` as defined in the
`IS-IS Sub-Sub-TLVs for SRv6 SID Sub-TLVs` IANA registry. This codepoint
will be used as the Sub-Sub-TLV Type to advertise the SRv6 SID Structure
Sub-Sub-TLV in the SRv6 End SID, SRv6 End.X SID, and SRv6 LAN End.X SID
Sub-TLVs.
Add the `IS-IS SRv6 End SID Sub-TLV Codepoint` as defined in the
`IS-IS Sub-TLVs for TLVs Advertising Prefix Reachability` IANA registry.
This codepoint will be used as the Sub-TLV
Type to advertise the SRv6 End SID Sub-TLV in the SRv6 Locator TLV.
Add a new TLV context value for the SRv6 Locator TLV. It will be needed
to support unpacking of the Sub-TLVs of the SRv6 Locator TLV in future
commits.
When zebra assigns a chunk to IS-IS, zebra sends a
ZEBRA_SRV6_MANAGER_GET_LOCATOR_CHUNK notification to IS-IS.
IS-IS invokes the `isis_zebra_process_srv6_locator_chunk()` callback to
process the received notification.
Actually, `isis_zebra_process_srv6_locator_chunk()` iterates over all
areas of the current IS-IS instance and looks for an area for which the
received chunk was requested.
If a match is found, the new chunk is added to the area's chunk list and
`lsp_regenerate_schedule()` is called to regenerate the LSPs to
advertise the new SRv6 locator.
This commit extends the `isis_zebra_process_srv6_locator_chunk()`
function to automatically allocate an SRv6 End SID from the received
chunk and install it in the data plane.
The SRv6 End SID is the instantiation of a Prefix-SID (RFC 8986 section
In some cases, IS-IS may attempt to remove routes that have not been
installed before. We can prevent IS-IS from doing this by aborting
`isis_zebra_route_del_route` when the ISIS_ROUTE_FLAG_ZEBRA_SYNCED flag
is unset, meaning that the route is not installed in the kernel.
zebra: Resolve default values for SRv6 flavor attr
When zebra receives a Netlink message containing a seg6local nexthop,
let's use the default values for optional attributes `lcblock_len` and
`lcnode_fn_len`, if they are not specified.
zebra: Resolve default values for SRv6 flavor attr
When zebra receives a Netlink message containing a seg6local nexthop,
let's use the default values for optional attributes `lcblock_len` and
`lcnode_fn_len`, if they are not specified.
When installing a local SID in the Linux kernel, `lcblock_len` and
`lcnode_fn_len` Netlink attributes are optional. When omitted, the
kernel uses the default values: lcblock_len=32 and lcnode_fn_len=16.
Let's use the same default values in FRR.
projects / matthieu / frr.git / log