backport: policy: T4151: Add policy ipv6-local-route

Adds support for `ip -6 rule` policy based routing.
Also, extends the existing ipv4 implemenation with a
`destination` key, which is translated as
`ip rule add to x.x.x.x/x` rules.

https://phabricator.vyos.net/T4151

1 files changed, 86 insertions, 53 deletions

diff --git a/src/conf_mode/policy-local-route.py b/src/conf_mode/policy-local-route.py
index 539189442..5e2b8c267 100755
--- a/src/conf_mode/policy-local-route.py
+++ b/src/conf_mode/policy-local-route.py
@@ -35,31 +35,56 @@ def get_config(config=None):
         conf = config
     else:
         conf = Config()
-    base = ['policy', 'local-route']
+    base = ['policy']
+
     pbr = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True)
 
-    # delete policy local-route
-    dict = {}
-    tmp = node_changed(conf, ['policy', 'local-route', 'rule'], key_mangling=('-', '_'))
-    if tmp:
-        for rule in (tmp or []):
-            src = leaf_node_changed(conf, ['policy', 'local-route', 'rule', rule, 'source'])
-            fwmk = leaf_node_changed(conf, ['policy', 'local-route', 'rule', rule, 'fwmark'])
-            if src:
-                dict = dict_merge({'rule_remove' : {rule : {'source' : src}}}, dict)
+    for route in ['local_route', 'local_route6']:
+        dict_id = 'rule_remove' if route == 'local_route' else 'rule6_remove'
+        route_key = 'local-route' if route == 'local_route' else 'local-route6'
+        base_rule = base + [route_key, 'rule']
+
+        # delete policy local-route
+        dict = {}
+        tmp = node_changed(conf, base_rule, key_mangling=('-', '_'))
+        if tmp:
+            for rule in (tmp or []):
+                src = leaf_node_changed(conf, base_rule + [rule, 'source'])
+                fwmk = leaf_node_changed(conf, base_rule + [rule, 'fwmark'])
+                dst = leaf_node_changed(conf, base_rule + [rule, 'destination'])
+                rule_def = {}
+                if src:
+                    rule_def = dict_merge({'source' : src}, rule_def)
+                if fwmk:
+                    rule_def = dict_merge({'fwmark' : fwmk}, rule_def)
+                if dst:
+                    rule_def = dict_merge({'destination' : dst}, rule_def)
+                dict = dict_merge({dict_id : {rule : rule_def}}, dict)
                 pbr.update(dict)
             if fwmk:
                 dict = dict_merge({'rule_remove' : {rule : {'fwmark' : fwmk}}}, dict)
                 pbr.update(dict)
 
-    # delete policy local-route rule x source x.x.x.x
-    # delete policy local-route rule x fwmark x
-    if 'rule' in pbr:
-        for rule in pbr['rule']:
-            src = leaf_node_changed(conf, ['policy', 'local-route', 'rule', rule, 'source'])
-            fwmk = leaf_node_changed(conf, ['policy', 'local-route', 'rule', rule, 'fwmark'])
-            if src:
-                dict = dict_merge({'rule_remove' : {rule : {'source' : src}}}, dict)
+        if not route in pbr:
+            continue
+
+        # delete policy local-route rule x source x.x.x.x
+        # delete policy local-route rule x fwmark x
+        # delete policy local-route rule x destination x.x.x.x
+        if 'rule' in pbr[route]:
+            for rule in pbr[route]['rule']:
+                src = leaf_node_changed(conf, base_rule + [rule, 'source'])
+                fwmk = leaf_node_changed(conf, base_rule + [rule, 'fwmark'])
+                dst = leaf_node_changed(conf, base_rule + [rule, 'destination'])
+
+                rule_def = {}
+                if src:
+                    rule_def = dict_merge({'source' : src}, rule_def)
+                if fwmk:
+                    rule_def = dict_merge({'fwmark' : fwmk}, rule_def)
+                if dst:
+                    rule_def = dict_merge({'destination' : dst}, rule_def)
+                dict = dict_merge({dict_id : {rule : rule_def}}, dict)
                 pbr.update(dict)
             if fwmk:
                 dict = dict_merge({'rule_remove' : {rule : {'fwmark' : fwmk}}}, dict)
@@ -72,13 +97,18 @@ def verify(pbr):
     if not pbr:
         return None
 
-    if 'rule' in pbr:
-        for rule in pbr['rule']:
-            if 'source' not in pbr['rule'][rule] and 'fwmark' not in pbr['rule'][rule]:
-                raise ConfigError('Source address or fwmark is required!')
-            else:
-                if 'set' not in pbr['rule'][rule] or 'table' not in pbr['rule'][rule]['set']:
-                    raise ConfigError('Table set is required!')
+    for route in ['local_route', 'local_route6']:
+        if not route in pbr:
+            continue
+
+        pbr_route = pbr[route]
+        if 'rule' in pbr_route:
+            for rule in pbr_route['rule']:
+                if 'source' not in pbr_route['rule'][rule] and 'destination' not in pbr_route['rule'][rule] and 'fwmark' not in pbr_route['rule'][rule]:
+                    raise ConfigError('Source or destination address or fwmark is required!')
+                else:
+                    if 'set' not in pbr_route['rule'][rule] or 'table' not in pbr_route['rule'][rule]['set']:
+                        raise ConfigError('Table set is required!')
 
     return None
 
@@ -93,36 +123,39 @@ def apply(pbr):
         return None
 
     # Delete old rule if needed
-    if 'rule_remove' in pbr:
-        for rule in pbr['rule_remove']:
-            if 'source' in pbr['rule_remove'][rule]:
-                for src in pbr['rule_remove'][rule]['source']:
-                    call(f'ip rule del prio {rule} from {src}')
-            if 'fwmark' in  pbr['rule_remove'][rule]:
-                for fwmk in pbr['rule_remove'][rule]['fwmark']:
-                    call(f'ip rule del prio {rule} from all fwmark {fwmk}')
+    for rule_rm in ['rule_remove', 'rule6_remove']:
+        if rule_rm in pbr:
+            v6 = " -6" if rule_rm == 'rule6_remove' else ""
+            for rule, rule_config in pbr[rule_rm].items():
+                for src in (rule_config['source'] or ['']):
+                    f_src = '' if src == '' else f' from {src} '
+                    for dst in (rule_config['destination'] or ['']):
+                        f_dst = '' if dst == '' else f' to {dst} '
+                        for fwmk in (rule_config['fwmark'] or ['']):
+                            f_fwmk = '' if fwmk == '' else f' fwmark {fwmk} '
+                            call(f'ip{v6} rule del prio {rule} {f_src}{f_dst}{f_fwmk}')
 
     # Generate new config
-    if 'rule' in pbr:
-        for rule in pbr['rule']:
-            table = pbr['rule'][rule]['set']['table']
-            # Only source in the rule
-            # set policy local-route rule 100 source '203.0.113.1'
-            if 'source' in pbr['rule'][rule] and not 'fwmark' in pbr['rule'][rule]:
-                for src in pbr['rule'][rule]['source']:
-                    call(f'ip rule add prio {rule} from {src} lookup {table}')
-            # Only fwmark in the rule
-            # set policy local-route rule 101 fwmark '23'
-            if 'fwmark' in pbr['rule'][rule] and not 'source' in pbr['rule'][rule]:
-                fwmk = pbr['rule'][rule]['fwmark']
-                call(f'ip rule add prio {rule} from all fwmark {fwmk} lookup {table}')
-            # Source and fwmark in the rule
-            # set policy local-route rule 100 source '203.0.113.1'
-            # set policy local-route rule 100 fwmark '23'
-            if 'source' in pbr['rule'][rule] and 'fwmark' in pbr['rule'][rule]:
-                fwmk = pbr['rule'][rule]['fwmark']
-                for src in pbr['rule'][rule]['source']:
-                    call(f'ip rule add prio {rule} from {src} fwmark {fwmk} lookup {table}')
+    for route in ['local_route', 'local_route6']:
+        if not route in pbr:
+            continue
+
+        v6 = " -6" if route == 'local_route6' else ""
+
+        pbr_route = pbr[route]
+        if 'rule' in pbr_route:
+            for rule, rule_config in pbr_route['rule'].items():
+                table = rule_config['set']['table']
+
+                for src in (rule_config['source'] or ['all']):
+                    f_src = '' if src == '' else f' from {src} '
+                    for dst in (rule_config['destination'] or ['all']):
+                        f_dst = '' if dst == '' else f' to {dst} '
+                        f_fwmk = ''
+                        if 'fwmark' in rule_config:
+                            fwmk = rule_config['fwmark']
+                            f_fwmk = f' fwmark {fwmk} '
+                        call(f'ip{v6} rule add prio {rule} {f_src}{f_dst}{f_fwmk} lookup {table}')
 
     return None