systemd-networkd: backport fix for rm unmanaged wifi

Upstream v250 of systemd-newtorkd contains a race which will drop the
config of unmanaged wireless interfaces during reconfigure or carrier
loss. This bug is fixed in v251 by this commit:

commit a0e99a377a2f22c0ba460d3e7228214008714c14
Author: Yu Watanabe <watanabe.yu+github@gmail.com>
Date:   Mon Jan 31 19:08:27 2022 +0900

    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.

A bug was filed upstream on v250 to have upstream backport but was
rejected as "version-too-ancient", so backport this commit as a patch to
systemd-networkd for kirkstone.

Fixes: [YOCTO #15134]

(From OE-Core rev: 56fdf57d99900b8dfb75bf915fcab45d4c1a458e)

Signed-off-by: C. Andy Martin <cam@myfastmail.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

2 files changed, 359 insertions, 0 deletions

diff --git a/meta/recipes-core/systemd/systemd/0001-network-remove-only-managed-configs-on-reconfigure-o.patch b/meta/recipes-core/systemd/systemd/0001-network-remove-only-managed-configs-on-reconfigure-o.patch
new file mode 100644
index 0000000000..8950981d2e
--- /dev/null
+++ b/meta/recipes-core/systemd/systemd/0001-network-remove-only-managed-configs-on-reconfigure-o.patch
@@ -0,0 +1,358 @@
+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
+
diff --git a/meta/recipes-core/systemd/systemd_250.5.bb b/meta/recipes-core/systemd/systemd_250.5.bb
index 784a7af271..21a09d8594 100644
--- a/meta/recipes-core/systemd/systemd_250.5.bb
+++ b/meta/recipes-core/systemd/systemd_250.5.bb
@@ -30,6 +30,7 @@ SRC_URI += "file://touchscreen.rules \
            file://0001-shared-json-allow-json_variant_dump-to-return-an-err.patch \
            file://CVE-2022-4415-1.patch \
            file://CVE-2022-4415-2.patch \
+           file://0001-network-remove-only-managed-configs-on-reconfigure-o.patch \
            "
 
 # patches needed by musl