BGP MPLSVPN next hop label allocation was using only the next-hop
IP address. As MPLSVPN contexts rely on bnc contexts, the real
nexthop interface is known, and the LSP entry to enter can apply
to the specific interface. To illustrate, the BGP service is able
to handle the following two iproute2 commands:
> ip -f mpls route add 105 via inet 192.0.2.45 dev r1-eth1
> ip -f mpls route add 105 via inet 192.0.2.46 dev r1-eth2
Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>
This commit introduces a new method to associate a label to
prefixes to export to a VPNv4 backbone. All the methods to
associate a label to a BGP update is documented in rfc4364,
chapter 4.3.2. Initially, the "single label for an entire
VRF" method was available. This commit adds "single label
for each attachment circuit" method.
The change impacts the control-plane, because each BGP update
is checked to know if the nexthop has reachability in the VRF
or not. If this is the case, then a unique label for a given
destination IP in the VRF will be picked up. This label will
be reused for an other BGP update that will have the same
nexthop IP address.
The change impacts the data-plane, because the MPLs pop
mechanism applied to incoming labelled packets changes: the
MPLS label is popped, and the packet is directly sent to the
connected nexthop described in the previous outgoing BGP VPN
update.
By default per-vrf mode is done, but the user may choose
the per-nexthop mode, by using the vty command from the
previous commit. In the latter case, a per-vrf label
will however be allocated to handle networks that are not directly
connected. This is the case for local traffic for instance.
The change also include the following:
- ECMP case
In case a route is learnt in a given VRF, and is resolved via an
ECMP nexthop. This implies that when exporting the route as a BGP
update, if label allocation per nexthop is used, then two possible
MPLS values could be picked up, which is not possible with the
current implementation. Actually, the NLRI for VPNv4 stores one
prefix, and one single label value, not two. Today, RFC8277 with
multiple label capability is not yet available.
To avoid this corner case, when a route is resolved via more than one
nexthop, the label allocation per nexthop will not apply, and the
default per-vrf label will be chosen.
Let us imagine BGP redistributes a static route using the `172.31.0.20`
nexthop. The nexthop resolution will find two different nexthops fo a
unique BGP update.
> r1# show running-config
> [..]
> vrf vrf1
> ip route 172.31.0.30/32 172.31.0.20
> r1# show bgp vrf vrf1 nexthop
> [..]
> 172.31.0.20 valid [IGP metric 0], #paths 1
> gate 192.0.2.11
> gate 192.0.2.12
> Last update: Mon Jan 16 09:27:09 2023
> Paths:
> 1/1 172.31.0.30/32 VRF vrf1 flags 0x20018
To avoid this situation, BGP updates that resolve over multiple
nexthops are using the unique per-vrf label.
- recursive route case
Prefixes that need a recursive route to be resolved can
also be eligible for mpls allocation per nexthop. In that
case, the nexthop will be the recursive nexthop calculated.
To achieve this, all nexthop types in bnc contexts are valid,
except for the blackhole nexthops.
- network declared prefixes
Nexthop tracking is used to look for the reachability of the
prefixes. When the the 'no bgp network import-check' command
is used, network declared prefixes are maintained active,
even if there is no active nexthop.
Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>
This commit introduces the necessary structs and apis to
create the cache entries that store the label information
associated to a given nexthop.
A hash table is created in each BGP instance for all the
AFIs: IPv4 and IPv6. That hash table is initialised.
An API to look and/or create an entry based on a given
nexthop.
Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>
A new label type is introduced: LP_TYPE_NEXTHOP. This new
label type will be used in next commits to allocate labels
for a specific nexthop IP address.
The commit changes add vty and json outputs to display
the new label type and the label values associated.
Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>
A new VTY command is introduced in ipv4 unicast and ipv6 unicast
address family, under a BGP instance.
> r1# label vpn export allocation-mode per-nexthop|per-vrf
This command will update the label values associated for each
BGP update to export to the global instance. Two modes are
available: per-nexthop and per-vrf. The latter is the default
one.
With this commit only, configuring label allocation per nexthop
will only reset the BGP updates, and the per-vrf mode label
allocation will be chosen.
Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>
This commit addresses an issue with an MPLS VPN network
redistributing static routes that are exported to the VPN,
and where the labels are allocated per next-hop.
For that purpose, the nexthop of the static routes is
checked against the nexthop tracking. The validation
of a valid nexthop will trigger the use of a unique
label for all prefixes using that destination.
However, the nexthop fails to be validated, with the
following message:
> evaluate_paths: prefix 172:31::14/128 (vrf vrf1), ignoring path due to
> martian or self-next-hop
The reason is due to the way the attr is created.
By default, the ATTR_NEXTHOP attribute is set for
all prefixes, whereas this flag should only be valid
for IPv4. In the case there is an IPv6 nexthop, remove
the ATTR_NEXTHOP flag.
Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>
The 'show mpls table json' command displays the outgoing interface
name only when the nexthop type is either NEXTHOP_TYPE_IFINDEX or
NEXTHOP_TYPE_IPV6_IFINDEX. add the interface name for the nexthop
type NEXTHOP_TYPE_IPV4_IFINDEX.
Fixes: ("b78b820d46d6") MPLS: Display enhancements and JSON support
Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>
This commit addresses the case where a service wants to install
an LSP entry to a next-hop located in a VRF instance. The incoming
MPLS packet is on the namespace and has to be directed to a nexthop
located behind an interface that sits in a specific VRF instance.
The below iproute command can illustrate:
> ip link add vrf1 type vrf table 10
> ip link set dev vrf1 up
> ip link set dev eth0 master vrf1
> ip a a 192.0.2.1/24 dev eth0
> ip -f mpls route add 105 via inet 192.0.2.45 dev eth0
If a service uses the ZEBRA_MPLS_LABELS messages, then the LSP
message is ignored: from zebra perspective, the MPLS entries are
visible via the 'show mpls table' command, but no LSP entry is
installed in the kernel.
The issue is in the nhlfe_nexthop_active_ipv[4/6] function: the
outgoing interface mentioned in the nexthop is searched in the
main VRF, whereas the interface is in a separate VRF. The interface
is not found, and the nhlfe to install is considered not active.
To address this issue, reuse the incoming vrf_id parameter transmitted
in the nexthop structure from the ZEBRA_MPLS_LABELS message. When
creating an NHLFE entry, the vrf_id is used instead of the DEFAULT_VRF.
And the nhlfe entry can be considered as active.
One alternate solution to reuse the vrf_id parameter in the mpls network
context would be to modify the search function in nhlfe_nexthop_active..()
function: looking for an existing ifindex in the zns. However, this
solution may not fit later when netns backend would be used.
Note that some changes have not been done yet and are considered
sufficient for now:
- The 'nhlfe_find' API: the assumption is done that only the linux vrf
backend is used for now.
- The 'mpls_lsp_install()' API: It is currently used by the CLI command
which does not handle the interface parameter, and the SRTE service, whih
always sends LSPs towards a nexthop located in the VRF_DEFAULT.
Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>
The ZEBRA_MPLS_LABELS_[ADD/DELETE/REPLACE] messages may change an
LSP entry based on an incoming MPLS entry, followed by a given
next-hop.
Having a next hop with no label information inside is rejected
by the zebra layer. As illustration, the following ZAPI message
would be rejected, because the next hop does not contain any
label information.
> ip -f mpls route add 105 via inet 192.0.2.45
At the same time, such configuration is desirable to be
supported:
An attempt has been done to configure the next-hop with an implicit-
null label. But the message is rejected by the kernel:
> ip -f mpls route add 104 as 3 via inet 192.0.2.45
> Error: Implicit NULL Label (3) can not be used in encapsulation.
The commit proposes to accept ZEBRA_MPLS_LABELS_[XX] messages with
a nexthop that does not contain any label information.
Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>
This commit contains fixes for the following issues found
- 'mgmt commit check' issued through 'vtysh -f' was actually commtting the changeset.
- On config validation failure backend, mgmtd was not passing the correct error-reason
to frontend.
- 'mgmt rollback ...' was reverting the change on backend, but config on mgmtd daemon
remains intact
Signed-off-by: Pushpasis Sarkar <pushpasis@gmail.com>
This commit adds user documentation for the new MGMT daemon and
new FRR Management Framework.
Co-authored-by: Yash Ranjan <ranjany@vmware.com>
Co-authored-by: Abhinay Ramesh <rabhinay@vmware.com>
Co-authored-by: Ujwal P <ujwalp@vmware.com>
Signed-off-by: Pushpasis Sarkar <pushpasis@gmail.com>
This commmit introduces Staticd as a backend client for the MGMTd
framework. All the static commands will be diverted to the MGMT
daemon and will use the transactional model to make changes to the
internal state. Similar mechanism can be used by other daemons to use
the MGMT framework in the future.
This commit includes the following functionalities in the changeset:
1. Diverts all the staticd (config only) commands to MGMTd.
2. Enrolls staticd as a backend client to use the MGMT framework.
3. Modify the staticd NB config handlers so that they can be compiled
into a library and loaded in the MGMTd process context.
Co-authored-by: Pushpasis Sarkar <pushpasis@gmail.com>
Co-authored-by: Abhinay Ramesh <rabhinay@vmware.com>
Co-authored-by: Ujwal P <ujwalp@vmware.com>
Signed-off-by: Yash Ranjan <ranjany@vmware.com>
This commit introduces the MGMT Transaction framework that takes
management requests from one (or more) frontend client sessions,
translates them into transactions and drives them to completion
in co-oridination with one (or more) backend client daemons
involved in the request.
This commit includes the following functionalities in the changeset:
1. Introduces the actual Transaction module. Commands added related to
transaction are:
a. show mgmt transaction all
2. Adds support for commit rollback feature which stores upto the 10
commit buffers. Each commit has a commit-id which can be used to
rollback to the exact configuration state.
Commands supported for this feature are:
a. show mgmt commit-history
b. mgmt rollback commit-id COMMIT_ID
3. Add hidden commands to enable record various performance metrics:
a. mgmt performance-measurement
b. mgmt reset-statistic
Co-authored-by: Pushpasis Sarkar <pushpasis@gmail.com>
Co-authored-by: Abhinay Ramesh <rabhinay@vmware.com>
Co-authored-by: Ujwal P <ujwalp@vmware.com>
Signed-off-by: Yash Ranjan <ranjany@vmware.com>
This commit introduces the MGMT Backend Interface which can be used
by back-end management client daemons like BGPd, Staticd, Zebra to
connect with new FRR Management daemon (MGMTd) and utilize the new
FRR Management Framework to let any Frontend clients to retrieve any
operational data or manipulate any configuration data owned by the
individual Backend daemon component.
This commit includes the following functionalities in the changeset:
1. Add new Backend server for Backend daemons connect to.
2. Add a C-based Backend client library which can be used by daemons
to communicate with MGMTd via the Backend interface.
3. Maintain a backend adapter for each connection from an appropriate
Backend client to facilitate client requests and track one or more
transactions initiated from Frontend client sessions that involves
the backend client component.
4. Add the following commands to inspect various Backend client
related information
a. show mgmt backend-adapter all
b. show mgmt backend-yang-xpath-registry
c. show mgmt yang-xpath-subscription
Co-authored-by: Pushpasis Sarkar <pushpasis@gmail.com>
Co-authored-by: Abhinay Ramesh <rabhinay@vmware.com>
Co-authored-by: Ujwal P <ujwalp@vmware.com>
Signed-off-by: Yash Ranjan <ranjany@vmware.com>
This commit introduces the Frontend Interface which can be used
by front-end management clients like Netconf server, Restconf
Server and CLI to interact with new FRR Management daemon (MGMTd)
to access and sometimes modify FRR management data.
This commit includes the following functionalities in the changeset:
1. Add new Frontend server for clients connect to.
2. Add a C-based Frontend client library which can be used by Frontend
clients to communicate with MGMTd via the Frontend interface.
3. Maintain a frontend adapter for each connection from an appropriate
Frontend client to facilitate client requests and track one or more
client sessions across it.
4. Define the protobuf message format for messages to be exchanged
between MGMTd Frontend module and the Frontend client.
5. This changeset also introduces an instance of MGMT Frontend client
embedded within the lib/vty module that can be leveraged by any FRR
daemon to connect to MGMTd's Frontend interface. The same has been
integrated with and initialized within the MGMTd daemon's process
context to implement a bunch of 'set-config', 'commit-apply',
'get-config' and 'get-data' commands via VTYSH
Co-authored-by: Pushpasis Sarkar <pushpasis@gmail.com>
Co-authored-by: Abhinay Ramesh <rabhinay@vmware.com>
Co-authored-by: Ujwal P <ujwalp@vmware.com>
Signed-off-by: Yash Ranjan <ranjany@vmware.com>
Features added in this commit:
1. Bringup/shutdown new management daemon 'mgmtd' along with FRR.
2. Support for Startup, Candidate and Running DBs.
3. Lock/Unlock DS feature using pthread lock.
4. Load config from a JSON file onto candidate DS.
5. Save config to a JSON file from running/candidate DS.
6. Dump candidate or running DS contents on the terminal or a file in
JSON/XML format.
7. Maintaining commit history (Full rollback support to be added in
future commits).
8. Addition of debug commands.
Co-authored-by: Yash Ranjan <ranjany@vmware.com>
Co-authored-by: Abhinay Ramesh <rabhinay@vmware.com>
Co-authored-by: Ujwal P <ujwalp@vmware.com>
Signed-off-by: Pushpasis Sarkar <pushpasis@gmail.com>
It's not allowed to install routes with zero distance, let's disallow this
for route-maps as well.
Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org>
Some debugs were especially hard to figure out in bgp_route.c
a) If using a %p pointer to print the bgp_path_info this
is pretty useless. Print where it came from instead
b) Use A.B.C.D/M(VRFNAME) when outputing the prefix
Just basically give more useful information.
Signed-off-by: Donald Sharp <sharpd@nvidia.com>
This path replaces isisd_format_id, sysid_print, snpa_print, rawlspid_print and
isonet_print functions by the new printfrr ISO System ID & Network Address
format facilities. It also updates the isisd code to the new iso_address
structure defined in lib/iso.h
Signed-off-by: Olivier Dugeon <olivier.dugeon@orange.com>
Like for IP addresses, this patch add a new format for printfrr collection to
print ISO System ID and Network address a.k.a IS-IS system ID & Network.
This new format is added to the library instead of isisd because other daemons
and tools need to print ISO System ID & Network Address.
Signed-off-by: Olivier Dugeon <olivier.dugeon@orange.com>
Prevent a use after free and tell the bfd subsystem
we are shutting down in staticd.
./bfd_topo3.test_bfd_topo3/r4.staticd.asan.2264460:==2264460==ERROR: AddressSanitizer: heap-use-after-free on address 0x61f000004698 at pc 0x7f65d1eb11b2 bp 0x7ffdbface490 sp 0x7ffdbface488
./bfd_topo3.test_bfd_topo3/r4.staticd.asan.2264460-READ of size 4 at 0x61f000004698 thread T0
./bfd_topo3.test_bfd_topo3/r4.staticd.asan.2264460- #0 0x7f65d1eb11b1 in zclient_bfd_command lib/bfd.c:307
./bfd_topo3.test_bfd_topo3/r4.staticd.asan.2264460- #1 0x7f65d1eb20f5 in _bfd_sess_send lib/bfd.c:507
./bfd_topo3.test_bfd_topo3/r4.staticd.asan.2264460- #2 0x7f65d20510aa in thread_call lib/thread.c:1989
./bfd_topo3.test_bfd_topo3/r4.staticd.asan.2264460- #3 0x7f65d2051f0a in _thread_execute lib/thread.c:2081
./bfd_topo3.test_bfd_topo3/r4.staticd.asan.2264460- #4 0x7f65d1eb271b in _bfd_sess_remove lib/bfd.c:544
./bfd_topo3.test_bfd_topo3/r4.staticd.asan.2264460- #5 0x7f65d1eb278d in bfd_sess_free lib/bfd.c:553
./bfd_topo3.test_bfd_topo3/r4.staticd.asan.2264460- #6 0x7f65d1eb5400 in bfd_protocol_integration_finish lib/bfd.c:1029
./bfd_topo3.test_bfd_topo3/r4.staticd.asan.2264460- #7 0x7f65d1f42f77 in hook_call_frr_fini lib/libfrr.c:41
./bfd_topo3.test_bfd_topo3/r4.staticd.asan.2264460- #8 0x7f65d1f494a1 in frr_fini lib/libfrr.c:1199
./bfd_topo3.test_bfd_topo3/r4.staticd.asan.2264460- #9 0x563b7abefd76 in sigint staticd/static_main.c:70
./bfd_topo3.test_bfd_topo3/r4.staticd.asan.2264460- #10 0x7f65d200ef91 in frr_sigevent_process lib/sigevent.c:115
./bfd_topo3.test_bfd_topo3/r4.staticd.asan.2264460- #11 0x7f65d204fac6 in thread_fetch lib/thread.c:1758
./bfd_topo3.test_bfd_topo3/r4.staticd.asan.2264460- #12 0x7f65d1f49377 in frr_run lib/libfrr.c:1184
./bfd_topo3.test_bfd_topo3/r4.staticd.asan.2264460- #13 0x563b7abefed1 in main staticd/static_main.c:160
./bfd_topo3.test_bfd_topo3/r4.staticd.asan.2264460- #14 0x7f65d1b92d09 in __libc_start_main ../csu/libc-start.c:308
./bfd_topo3.test_bfd_topo3/r4.staticd.asan.2264460- #15 0x563b7abefa99 in _start (/usr/lib/frr/staticd+0x15a99)
./bfd_topo3.test_bfd_topo3/r4.staticd.asan.2264460-
Signed-off-by: Donald Sharp <sharpd@nvidia.com>
Add a hash_clean_and_free() function as well as convert
the code to use it. This function also takes a double
pointer to the hash to set it NULL. Also it cleanly
does nothing if the pointer is NULL( as a bunch of
code tested for ).
Signed-off-by: Donald Sharp <sharpd@nvidia.com>
There are some specific edge-cases when is a need to run FRR and another FRR
and/or another BGP implementation on the same box. Relaxing 127.0.0.0/8 for
this case might be reasonable.
An example below peering via 127.0.0.0/8 between FRR and GoBGP:
```
% ss -ntlp | grep 179
LISTEN 0 4096 127.0.0.1:179 0.0.0.0:*
LISTEN 0 128 127.0.0.2:179 0.0.0.0:*
% grep 127.0.0.2 /etc/frr/daemons
bgpd_options=" -A 127.0.0.1 -l 127.0.0.2"
% grep local /etc/gobgp/config.toml
local-address-list = ["127.0.0.1"]
donatas-pc# sh ip bgp summary
IPv4 Unicast Summary (VRF default):
BGP router identifier 192.168.10.17, local AS number 65001 vrf-id 0
BGP table version 0
RIB entries 0, using 0 bytes of memory
Peers 1, using 725 KiB of memory
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd PfxSnt Desc
127.0.0.1 4 65002 7 7 0 0 0 00:02:02 0 0 N/A
Total number of neighbors 1
donatas-pc#
```
Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org>
Description:
After area range config, summary lsas are aggerated to configured
route but later it was being flushed instead of the actual summary
lsa. This was seen when prefix-id of the aggregated route is same
as one of the actual summary route.
Here, aggregated summary lsa need to be returned to set the flag
SUMMARY_APPROVE after originating aggregated summary lsa but its not.
Which is being cleaned up as part of unapproved summary cleanup.
Corrected this now.
Issue: #13028
Signed-off-by: Rajesh Girada <rgirada@vmware.com>
Due to the wrong input argv id, "argv[idx_word]->arg"
fetched in-correctly and it clears all the route-maps instead of
specific one.
Now correct argv id is passed to clear the given route-map counters.
Also, use RMAP_NAME which allows to show list of configured
route-maps in the system.
After Fix:-
Ticket:#3407773
Issue:3407773
Testing: UT done
Before:
TORC11# clear route-map counters
<cr>
WORD route-map name
After:
TORC11# clear route-map counters
<cr>
RMAP_NAME route-map name
my-as
Signed-off-by: Chirag Shah <chirag@nvidia.com>
Signed-off-by: Sindhu Parvathi Gopinathan's <sgopinathan@nvidia.com>
When deleting a bfd peer during shutdown, let's ensure
that any scheduled events are actually stopped.
==7759== Invalid read of size 4
==7759== at 0x48BF700: _bfd_sess_valid (bfd.c:419)
==7759== by 0x48BF700: _bfd_sess_send (bfd.c:470)
==7759== by 0x492F79C: thread_call (thread.c:2008)
==7759== by 0x48E9BD7: frr_run (libfrr.c:1223)
==7759== by 0x1C739B: main (bgp_main.c:550)
==7759== Address 0xfb687a4 is 4 bytes inside a block of size 272 free'd
==7759== at 0x48369AB: free (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so)
==7759== by 0x48BFA5A: bfd_sess_free (bfd.c:535)
==7759== by 0x2B7034: bgp_peer_remove_bfd (bgp_bfd.c:339)
==7759== by 0x29FF8A: peer_free (bgpd.c:1160)
==7759== by 0x29FF8A: peer_unlock_with_caller (bgpd.c:1192)
==7759== by 0x2A0506: peer_delete (bgpd.c:2633)
==7759== by 0x208190: bgp_stop (bgp_fsm.c:1639)
==7759== by 0x20C082: bgp_event_update (bgp_fsm.c:2751)
==7759== by 0x492F79C: thread_call (thread.c:2008)
==7759== by 0x48E9BD7: frr_run (libfrr.c:1223)
==7759== by 0x1C739B: main (bgp_main.c:550)
==7759== Block was alloc'd at
==7759== at 0x4837B65: calloc (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so)
==7759== by 0x48F53AF: qcalloc (memory.c:116)
==7759== by 0x48BF98D: bfd_sess_new (bfd.c:397)
==7759== by 0x2B76DC: bgp_peer_configure_bfd (bgp_bfd.c:298)
==7759== by 0x2B76DC: bgp_peer_configure_bfd (bgp_bfd.c:279)
==7759== by 0x29BA06: peer_group2peer_config_copy (bgpd.c:2803)
==7759== by 0x2A3D96: peer_create_bind_dynamic_neighbor (bgpd.c:4107)
==7759== by 0x2A4195: peer_lookup_dynamic_neighbor (bgpd.c:4239)
==7759== by 0x21AB72: bgp_accept (bgp_network.c:422)
==7759== by 0x492F79C: thread_call (thread.c:2008)
==7759== by 0x48E9BD7: frr_run (libfrr.c:1223)
==7759== by 0x1C739B: main (bgp_main.c:550)
tl;dr -> Effectively, in this test setup we have 300 dynamic bgp
sessions all of which are using bfd. When a peer collision is detected
or we remove the peers, if an event has been scheduled but not actually
executed yet the event event was not actually being stopped, leaving
the bsp pointer on the thread->arg and causing a crash when it is
executed.
Signed-off-by: Donald Sharp <sharpd@nvidia.com>
