path: root/meta/recipes-core/systemd/systemd/0001-network-remove-only-managed-configs-on-reconfigure-o.patch

From 31b25c7d360a2ef2da1717aa39f190de5222d11a Mon Sep 17 00:00:00 2001
From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Mon, 31 Jan 2022 19:08:27 +0900
Subject: [PATCH] network: remove only managed configs on reconfigure or
 carrier lost

Otherwise, if the carrir of the non-managed interface is lost, the
configs such as addresses or routes on the interface will be removed by
networkd.

Upstream-Status: Backport [systemd v251 a0e99a377a2f22c0ba460d3e7228214008714c14]
Signed-off-by: C. Andy Martin <cam@myfastmail.com>
---
 src/network/networkd-address.c              | 13 +++++--------
 src/network/networkd-address.h              |  2 +-
 src/network/networkd-link.c                 | 18 ++++++++++--------
 src/network/networkd-neighbor.c             |  6 +++++-
 src/network/networkd-neighbor.h             |  2 +-
 src/network/networkd-nexthop.c              | 16 ++++++++++------
 src/network/networkd-nexthop.h              |  2 +-
 src/network/networkd-route.c                | 16 ++++++++++------
 src/network/networkd-route.h                |  2 +-
 src/network/networkd-routing-policy-rule.c  |  4 ++--
 src/network/networkd-routing-policy-rule.h  |  2 +-
 test/test-network/systemd-networkd-tests.py |  2 +-
 12 files changed, 48 insertions(+), 37 deletions(-)

diff --git a/src/network/networkd-address.c b/src/network/networkd-address.c
index 7df743efb5..01c1d88dec 100644
--- a/src/network/networkd-address.c
+++ b/src/network/networkd-address.c
@@ -891,22 +891,19 @@ int link_drop_foreign_addresses(Link *link) {
         return r;
 }
 
-int link_drop_addresses(Link *link) {
+int link_drop_managed_addresses(Link *link) {
         Address *address;
         int k, r = 0;
 
         assert(link);
 
         SET_FOREACH(address, link->addresses) {
-                /* Ignore addresses not assigned yet or already removing. */
-                if (!address_exists(address))
+                /* Do not touch addresses managed by kernel or other tools. */
+                if (address->source == NETWORK_CONFIG_SOURCE_FOREIGN)
                         continue;
 
-                /* Do not drop IPv6LL addresses assigned by the kernel here. They will be dropped in
-                 * link_drop_ipv6ll_addresses() if IPv6LL addressing is disabled. */
-                if (address->source == NETWORK_CONFIG_SOURCE_FOREIGN &&
-                    address->family == AF_INET6 &&
-                    in6_addr_is_link_local(&address->in_addr.in6))
+                /* Ignore addresses not assigned yet or already removing. */
+                if (!address_exists(address))
                         continue;
 
                 k = address_remove(address);
diff --git a/src/network/networkd-address.h b/src/network/networkd-address.h
index 41c4ce6fa4..b2110d8d21 100644
--- a/src/network/networkd-address.h
+++ b/src/network/networkd-address.h
@@ -74,7 +74,7 @@ void address_set_broadcast(Address *a);
 
 DEFINE_NETWORK_SECTION_FUNCTIONS(Address, address_free);
 
-int link_drop_addresses(Link *link);
+int link_drop_managed_addresses(Link *link);
 int link_drop_foreign_addresses(Link *link);
 int link_drop_ipv6ll_addresses(Link *link);
 void link_foreignize_addresses(Link *link);
diff --git a/src/network/networkd-link.c b/src/network/networkd-link.c
index b62a154828..12c592b257 100644
--- a/src/network/networkd-link.c
+++ b/src/network/networkd-link.c
@@ -1070,27 +1070,27 @@ static int link_drop_foreign_config(Link *link) {
         return r;
 }
 
-static int link_drop_config(Link *link) {
+static int link_drop_managed_config(Link *link) {
         int k, r;
 
         assert(link);
         assert(link->manager);
 
-        r = link_drop_routes(link);
+        r = link_drop_managed_routes(link);
 
-        k = link_drop_nexthops(link);
+        k = link_drop_managed_nexthops(link);
         if (k < 0 && r >= 0)
                 r = k;
 
-        k = link_drop_addresses(link);
+        k = link_drop_managed_addresses(link);
         if (k < 0 && r >= 0)
                 r = k;
 
-        k = link_drop_neighbors(link);
+        k = link_drop_managed_neighbors(link);
         if (k < 0 && r >= 0)
                 r = k;
 
-        k = link_drop_routing_policy_rules(link);
+        k = link_drop_managed_routing_policy_rules(link);
         if (k < 0 && r >= 0)
                 r = k;
 
@@ -1318,7 +1318,9 @@ static int link_reconfigure_impl(Link *link, bool force) {
                  * link_drop_foreign_config() in link_configure(). */
                 link_foreignize_config(link);
         else {
-                r = link_drop_config(link);
+                /* Remove all managed configs. Note, foreign configs are removed in later by
+                 * link_configure() -> link_drop_foreign_config() if the link is managed by us. */
+                r = link_drop_managed_config(link);
                 if (r < 0)
                         return r;
         }
@@ -1705,7 +1707,7 @@ static int link_carrier_lost_impl(Link *link) {
         if (r < 0)
                 ret = r;
 
-        r = link_drop_config(link);
+        r = link_drop_managed_config(link);
         if (r < 0 && ret >= 0)
                 ret = r;
 
diff --git a/src/network/networkd-neighbor.c b/src/network/networkd-neighbor.c
index 1766095e53..b58898a6dc 100644
--- a/src/network/networkd-neighbor.c
+++ b/src/network/networkd-neighbor.c
@@ -406,13 +406,17 @@ int link_drop_foreign_neighbors(Link *link) {
         return r;
 }
 
-int link_drop_neighbors(Link *link) {
+int link_drop_managed_neighbors(Link *link) {
         Neighbor *neighbor;
         int k, r = 0;
 
         assert(link);
 
         SET_FOREACH(neighbor, link->neighbors) {
+                /* Do not touch nexthops managed by kernel or other tools. */
+                if (neighbor->source == NETWORK_CONFIG_SOURCE_FOREIGN)
+                        continue;
+
                 /* Ignore neighbors not assigned yet or already removing. */
                 if (!neighbor_exists(neighbor))
                         continue;
diff --git a/src/network/networkd-neighbor.h b/src/network/networkd-neighbor.h
index e9e1854110..8e3c510cd5 100644
--- a/src/network/networkd-neighbor.h
+++ b/src/network/networkd-neighbor.h
@@ -34,7 +34,7 @@ int neighbor_compare_func(const Neighbor *a, const Neighbor *b);
 
 void network_drop_invalid_neighbors(Network *network);
 
-int link_drop_neighbors(Link *link);
+int link_drop_managed_neighbors(Link *link);
 int link_drop_foreign_neighbors(Link *link);
 void link_foreignize_neighbors(Link *link);
 
diff --git a/src/network/networkd-nexthop.c b/src/network/networkd-nexthop.c
index b829aaab90..42aa8c4c59 100644
--- a/src/network/networkd-nexthop.c
+++ b/src/network/networkd-nexthop.c
@@ -613,8 +613,8 @@ static void manager_mark_nexthops(Manager *manager, bool foreign, const Link *ex
                 if (nexthop->protocol == RTPROT_KERNEL)
                         continue;
 
-                /* When 'foreign' is true, do not remove nexthops we configured. */
-                if (foreign && nexthop->source != NETWORK_CONFIG_SOURCE_FOREIGN)
+                /* When 'foreign' is true, mark only foreign nexthops, and vice versa. */
+                if (foreign != (nexthop->source == NETWORK_CONFIG_SOURCE_FOREIGN))
                         continue;
 
                 /* Ignore nexthops not assigned yet or already removed. */
@@ -641,7 +641,7 @@ static void manager_mark_nexthops(Manager *manager, bool foreign, const Link *ex
         }
 }
 
-static int manager_drop_nexthops(Manager *manager) {
+static int manager_drop_marked_nexthops(Manager *manager) {
         NextHop *nexthop;
         int k, r = 0;
 
@@ -704,14 +704,14 @@ int link_drop_foreign_nexthops(Link *link) {
 
         manager_mark_nexthops(link->manager, /* foreign = */ true, NULL);
 
-        k = manager_drop_nexthops(link->manager);
+        k = manager_drop_marked_nexthops(link->manager);
         if (k < 0 && r >= 0)
                 r = k;
 
         return r;
 }
 
-int link_drop_nexthops(Link *link) {
+int link_drop_managed_nexthops(Link *link) {
         NextHop *nexthop;
         int k, r = 0;
 
@@ -723,6 +723,10 @@ int link_drop_nexthops(Link *link) {
                 if (nexthop->protocol == RTPROT_KERNEL)
                         continue;
 
+                /* Do not touch addresses managed by kernel or other tools. */
+                if (nexthop->source == NETWORK_CONFIG_SOURCE_FOREIGN)
+                        continue;
+
                 /* Ignore nexthops not assigned yet or already removing. */
                 if (!nexthop_exists(nexthop))
                         continue;
@@ -734,7 +738,7 @@ int link_drop_nexthops(Link *link) {
 
         manager_mark_nexthops(link->manager, /* foreign = */ false, link);
 
-        k = manager_drop_nexthops(link->manager);
+        k = manager_drop_marked_nexthops(link->manager);
         if (k < 0 && r >= 0)
                 r = k;
 
diff --git a/src/network/networkd-nexthop.h b/src/network/networkd-nexthop.h
index 7a8920238c..1e54e9f211 100644
--- a/src/network/networkd-nexthop.h
+++ b/src/network/networkd-nexthop.h
@@ -44,7 +44,7 @@ int nexthop_compare_func(const NextHop *a, const NextHop *b);
 
 void network_drop_invalid_nexthops(Network *network);
 
-int link_drop_nexthops(Link *link);
+int link_drop_managed_nexthops(Link *link);
 int link_drop_foreign_nexthops(Link *link);
 void link_foreignize_nexthops(Link *link);
 
diff --git a/src/network/networkd-route.c b/src/network/networkd-route.c
index ee7a535075..7e6fe8bc11 100644
--- a/src/network/networkd-route.c
+++ b/src/network/networkd-route.c
@@ -788,8 +788,8 @@ static void manager_mark_routes(Manager *manager, bool foreign, const Link *exce
                 if (route->protocol == RTPROT_KERNEL)
                         continue;
 
-                /* When 'foreign' is true, do not remove routes we configured. */
-                if (foreign && route->source != NETWORK_CONFIG_SOURCE_FOREIGN)
+                /* When 'foreign' is true, mark only foreign routes, and vice versa. */
+                if (foreign != (route->source == NETWORK_CONFIG_SOURCE_FOREIGN))
                         continue;
 
                 /* Do not touch dynamic routes. They will removed by dhcp_pd_prefix_lost() */
@@ -834,7 +834,7 @@ static void manager_mark_routes(Manager *manager, bool foreign, const Link *exce
         }
 }
 
-static int manager_drop_routes(Manager *manager) {
+static int manager_drop_marked_routes(Manager *manager) {
         Route *route;
         int k, r = 0;
 
@@ -955,14 +955,14 @@ int link_drop_foreign_routes(Link *link) {
 
         manager_mark_routes(link->manager, /* foreign = */ true, NULL);
 
-        k = manager_drop_routes(link->manager);
+        k = manager_drop_marked_routes(link->manager);
         if (k < 0 && r >= 0)
                 r = k;
 
         return r;
 }
 
-int link_drop_routes(Link *link) {
+int link_drop_managed_routes(Link *link) {
         Route *route;
         int k, r = 0;
 
@@ -973,6 +973,10 @@ int link_drop_routes(Link *link) {
                 if (route_by_kernel(route))
                         continue;
 
+                /* Do not touch routes managed by kernel or other tools. */
+                if (route->source == NETWORK_CONFIG_SOURCE_FOREIGN)
+                        continue;
+
                 if (!route_exists(route))
                         continue;
 
@@ -983,7 +987,7 @@ int link_drop_routes(Link *link) {
 
         manager_mark_routes(link->manager, /* foreign = */ false, link);
 
-        k = manager_drop_routes(link->manager);
+        k = manager_drop_marked_routes(link->manager);
         if (k < 0 && r >= 0)
                 r = k;
 
diff --git a/src/network/networkd-route.h b/src/network/networkd-route.h
index e3e22a5985..2180a196fc 100644
--- a/src/network/networkd-route.h
+++ b/src/network/networkd-route.h
@@ -82,7 +82,7 @@ int route_remove(Route *route);
 
 int route_get(Manager *manager, Link *link, const Route *in, Route **ret);
 
-int link_drop_routes(Link *link);
+int link_drop_managed_routes(Link *link);
 int link_drop_foreign_routes(Link *link);
 void link_foreignize_routes(Link *link);
 
diff --git a/src/network/networkd-routing-policy-rule.c b/src/network/networkd-routing-policy-rule.c
index 90086f35a7..d4363060d8 100644
--- a/src/network/networkd-routing-policy-rule.c
+++ b/src/network/networkd-routing-policy-rule.c
@@ -653,8 +653,8 @@ static void manager_mark_routing_policy_rules(Manager *m, bool foreign, const Li
                 if (rule->protocol == RTPROT_KERNEL)
                         continue;
 
-                /* When 'foreign' is true, do not remove rules we configured. */
-                if (foreign && rule->source != NETWORK_CONFIG_SOURCE_FOREIGN)
+                /* When 'foreign' is true, mark only foreign rules, and vice versa. */
+                if (foreign != (rule->source == NETWORK_CONFIG_SOURCE_FOREIGN))
                         continue;
 
                 /* Ignore rules not assigned yet or already removing. */
diff --git a/src/network/networkd-routing-policy-rule.h b/src/network/networkd-routing-policy-rule.h
index f52943bd2e..7cc6f55c8d 100644
--- a/src/network/networkd-routing-policy-rule.h
+++ b/src/network/networkd-routing-policy-rule.h
@@ -71,7 +71,7 @@ int manager_drop_routing_policy_rules_internal(Manager *m, bool foreign, const L
 static inline int manager_drop_foreign_routing_policy_rules(Manager *m) {
         return manager_drop_routing_policy_rules_internal(m, true, NULL);
 }
-static inline int link_drop_routing_policy_rules(Link *link) {
+static inline int link_drop_managed_routing_policy_rules(Link *link) {
         assert(link);
         return manager_drop_routing_policy_rules_internal(link->manager, false, link);
 }
diff --git a/test/test-network/systemd-networkd-tests.py b/test/test-network/systemd-networkd-tests.py
index ac2c1ba034..ed4d4992b1 100755
--- a/test/test-network/systemd-networkd-tests.py
+++ b/test/test-network/systemd-networkd-tests.py
@@ -3876,7 +3876,7 @@ class NetworkdBridgeTests(unittest.TestCase, Utilities):
         print(output)
         self.assertRegex(output, 'NO-CARRIER')
         self.assertNotRegex(output, '192.168.0.15/24')
-        self.assertNotRegex(output, '192.168.0.16/24')
+        self.assertRegex(output, '192.168.0.16/24') # foreign address is kept
 
         print('### ip -6 route list table all dev bridge99')
         output = check_output('ip -6 route list table all dev bridge99')
-- 
2.34.1