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authorChristian Breunig <christian@breunig.cc>2023-12-20 22:38:52 +0100
committerChristian Breunig <christian@breunig.cc>2023-12-20 22:38:52 +0100
commit774cc97eda61eb0b91df820797fb3c705d0073d5 (patch)
tree84d94d5132b3f184bcc62f34541c05f0c4652745 /src
parent10701108fecb36f7be7eb7ef5f1e54e63da5fb4e (diff)
downloadvyos-1x-774cc97eda61eb0b91df820797fb3c705d0073d5.tar.gz
vyos-1x-774cc97eda61eb0b91df820797fb3c705d0073d5.zip
srv6: T591: enable SR enabled packet processing on defined interfaces
The Linux Kernel needs to be told if IPv6 SR enabled packets whether should be processed or not. This is done using /proc/sys/net/conf/<iface>/seg6_* variables: seg6_enabled - BOOL Accept or drop SR-enabled IPv6 packets on this interface. Relevant packets are those with SRH present and DA = local. 0 - disabled (default) not 0 - enabled Or the VyOS CLI command: * set protocols segment-routing interface eth0 srv6
Diffstat (limited to 'src')
-rwxr-xr-xsrc/conf_mode/protocols_segment_routing.py66
-rw-r--r--src/etc/sysctl.d/30-vyos-router.conf3
2 files changed, 58 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/etc/sysctl.d/30-vyos-router.conf b/src/etc/sysctl.d/30-vyos-router.conf
index 1c9b8999f..6291be5f0 100644
--- a/src/etc/sysctl.d/30-vyos-router.conf
+++ b/src/etc/sysctl.d/30-vyos-router.conf
@@ -105,3 +105,6 @@ net.core.rps_sock_flow_entries = 32768
net.core.default_qdisc=fq_codel
net.ipv4.tcp_congestion_control=bbr
+# Disable IPv6 Segment Routing packets by default
+net.ipv6.conf.all.seg6_enabled = 0
+net.ipv6.conf.default.seg6_enabled = 0