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authorChristian Breunig <christian@breunig.cc>2023-12-21 16:27:53 +0100
committerGitHub <noreply@github.com>2023-12-21 16:27:53 +0100
commit2df14d0a2b07061835d1718457925355a7a951c3 (patch)
treead3c2657c66ea7e94bb28fd41b8b99a79607b05c /src/conf_mode
parent11b3750c4a01a120dc386e72a6781b1c16ed1120 (diff)
parent774cc97eda61eb0b91df820797fb3c705d0073d5 (diff)
downloadvyos-1x-2df14d0a2b07061835d1718457925355a7a951c3.tar.gz
vyos-1x-2df14d0a2b07061835d1718457925355a7a951c3.zip
Merge pull request #2663 from c-po/srv6-part2
srv6: T591: enable SR enabled packet processing on defined interfaces
Diffstat (limited to 'src/conf_mode')
-rwxr-xr-xsrc/conf_mode/protocols_segment_routing.py66
-rwxr-xr-xsrc/conf_mode/vrf.py12
2 files changed, 67 insertions, 11 deletions
diff --git a/src/conf_mode/protocols_segment_routing.py b/src/conf_mode/protocols_segment_routing.py
index eb1653212..d865c2ac0 100755
--- a/src/conf_mode/protocols_segment_routing.py
+++ b/src/conf_mode/protocols_segment_routing.py
@@ -19,7 +19,10 @@ import os
from sys import exit
from vyos.config import Config
+from vyos.configdict import node_changed
from vyos.template import render_to_string
+from vyos.utils.dict import dict_search
+from vyos.utils.system import sysctl_write
from vyos import ConfigError
from vyos import frr
from vyos import airbag
@@ -32,33 +35,74 @@ def get_config(config=None):
conf = Config()
base = ['protocols', 'segment-routing']
- sr = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True, no_tag_node_value_mangle=True)
+ sr = conf.get_config_dict(base, key_mangling=('-', '_'),
+ get_first_key=True,
+ no_tag_node_value_mangle=True,
+ with_recursive_defaults=True)
- # We have gathered the dict representation of the CLI, but there are default
- # options which we need to update into the dictionary retrived.
- sr = conf.merge_defaults(sr, recursive=True)
+ # FRR has VRF support for different routing daemons. As interfaces belong
+ # to VRFs - or the global VRF, we need to check for changed interfaces so
+ # that they will be properly rendered for the FRR config. Also this eases
+ # removal of interfaces from the running configuration.
+ interfaces_removed = node_changed(conf, base + ['interface'])
+ if interfaces_removed:
+ sr['interface_removed'] = list(interfaces_removed)
+ import pprint
+ pprint.pprint(sr)
return sr
-def verify(static):
+def verify(sr):
+ if 'srv6' in sr:
+ srv6_enable = False
+ if 'interface' in sr:
+ for interface, interface_config in sr['interface'].items():
+ if 'srv6' in interface_config:
+ srv6_enable = True
+ break
+ if not srv6_enable:
+ raise ConfigError('SRv6 should be enabled on at least one interface!')
return None
-def generate(static):
- if not static:
+def generate(sr):
+ if not sr:
return None
- static['new_frr_config'] = render_to_string('frr/zebra.segment_routing.frr.j2', static)
+ sr['new_frr_config'] = render_to_string('frr/zebra.segment_routing.frr.j2', sr)
return None
-def apply(static):
+def apply(sr):
zebra_daemon = 'zebra'
+ if 'interface_removed' in sr:
+ for interface in sr['interface_removed']:
+ # Disable processing of IPv6-SR packets
+ sysctl_write(f'net.ipv6.conf.{interface}.seg6_enabled', '0')
+
+ if 'interface' in sr:
+ for interface, interface_config in sr['interface'].items():
+ # Accept or drop SR-enabled IPv6 packets on this interface
+ if 'srv6' in interface_config:
+ sysctl_write(f'net.ipv6.conf.{interface}.seg6_enabled', '1')
+ # Define HMAC policy for ingress SR-enabled packets on this interface
+ # It's a redundant check as HMAC has a default value - but better safe
+ # then sorry
+ tmp = dict_search('srv6.hmac', interface_config)
+ if tmp == 'accept':
+ sysctl_write(f'net.ipv6.conf.{interface}.seg6_require_hmac', '0')
+ elif tmp == 'drop':
+ sysctl_write(f'net.ipv6.conf.{interface}.seg6_require_hmac', '1')
+ elif tmp == 'ignore':
+ sysctl_write(f'net.ipv6.conf.{interface}.seg6_require_hmac', '-1')
+ else:
+ sysctl_write(f'net.ipv6.conf.{interface}.seg6_enabled', '0')
+
# Save original configuration prior to starting any commit actions
frr_cfg = frr.FRRConfig()
frr_cfg.load_configuration(zebra_daemon)
frr_cfg.modify_section(r'^segment-routing')
- if 'new_frr_config' in static:
- frr_cfg.add_before(frr.default_add_before, static['new_frr_config'])
+ if 'new_frr_config' in sr:
+ frr_cfg.add_before(frr.default_add_before, sr['new_frr_config'])
frr_cfg.commit_configuration(zebra_daemon)
return None
diff --git a/src/conf_mode/vrf.py b/src/conf_mode/vrf.py
index 37625142c..9b1b6355f 100755
--- a/src/conf_mode/vrf.py
+++ b/src/conf_mode/vrf.py
@@ -214,6 +214,18 @@ def apply(vrf):
# Delete the VRF Kernel interface
call(f'ip link delete dev {tmp}')
+ # Enable/Disable VRF strict mode
+ # When net.vrf.strict_mode=0 (default) it is possible to associate multiple
+ # VRF devices to the same table. Conversely, when net.vrf.strict_mode=1 a
+ # table can be associated to a single VRF device.
+ #
+ # A VRF table can be used by the VyOS CLI only once (ensured by verify()),
+ # this simply adds an additional Kernel safety net
+ strict_mode = '0'
+ # Set to 1 if any VRF is defined
+ if 'name' in vrf: strict_mode = '1'
+ sysctl_write('net.vrf.strict_mode', strict_mode)
+
if 'name' in vrf:
# Separate VRFs in conntrack table
# check if table already exists