network: read link specific sysctl value

This introduce link_sysctl_ipv6_enabled() and replaces
manager_sysctl_ipv6_enabled() with it.

8 files changed, 27 insertions, 29 deletions

diff --git a/src/network/networkd-address.c b/src/network/networkd-address.c
index 7fe99bc485..e75a49f614 100644
--- a/src/network/networkd-address.c
+++ b/src/network/networkd-address.c
@@ -566,7 +566,7 @@ int address_configure(
         assert(link->manager->rtnl);
         assert(callback);
 
-        if (address->family == AF_INET6 && manager_sysctl_ipv6_enabled(link->manager) == 0) {
+        if (address->family == AF_INET6 && link_sysctl_ipv6_enabled(link) == 0) {
                 log_link_warning(link, "An IPv6 address is requested, but IPv6 is disabled by sysctl, ignoring.");
                 return 0;
         }
diff --git a/src/network/networkd-fdb.c b/src/network/networkd-fdb.c
index 4cacc44106..e3333698f8 100644
--- a/src/network/networkd-fdb.c
+++ b/src/network/networkd-fdb.c
@@ -124,7 +124,7 @@ int fdb_entry_configure(Link *link, FdbEntry *fdb_entry) {
         assert(link->manager);
         assert(fdb_entry);
 
-        if (fdb_entry->family == AF_INET6 && manager_sysctl_ipv6_enabled(link->manager) == 0) {
+        if (fdb_entry->family == AF_INET6 && link_sysctl_ipv6_enabled(link) == 0) {
                 log_link_warning(link, "An IPv6 fdb entry is requested, but IPv6 is disabled by sysctl, ignoring.");
                 return 0;
         }
diff --git a/src/network/networkd-link.c b/src/network/networkd-link.c
index 115e26e307..67c0903fa6 100644
--- a/src/network/networkd-link.c
+++ b/src/network/networkd-link.c
@@ -62,6 +62,20 @@ DUID* link_get_duid(Link *link) {
                 return &link->manager->duid;
 }
 
+int link_sysctl_ipv6_enabled(Link *link) {
+        _cleanup_free_ char *value = NULL;
+        int r;
+
+        r = sysctl_read_ip_property(AF_INET6, link->ifname, "disable_ipv6", &value);
+        if (r < 0)
+                return log_link_warning_errno(link, r,
+                                              "Failed to read net.ipv6.conf.%s.disable_ipv6 sysctl property: %m",
+                                              link->ifname);
+
+        link->sysctl_ipv6_enabled = value[0] == '0';
+        return link->sysctl_ipv6_enabled;
+}
+
 static bool link_dhcp6_enabled(Link *link) {
         assert(link);
 
@@ -80,7 +94,7 @@ static bool link_dhcp6_enabled(Link *link) {
         if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan"))
                 return false;
 
-        if (manager_sysctl_ipv6_enabled(link->manager) == 0)
+        if (link_sysctl_ipv6_enabled(link) == 0)
                 return false;
 
         return link->network->dhcp & ADDRESS_FAMILY_IPV6;
@@ -166,7 +180,7 @@ static bool link_ipv6ll_enabled(Link *link) {
         if (link->network->bond)
                 return false;
 
-        if (manager_sysctl_ipv6_enabled(link->manager) == 0)
+        if (link_sysctl_ipv6_enabled(link) == 0)
                 return false;
 
         return link->network->link_local & ADDRESS_FAMILY_IPV6;
@@ -181,7 +195,7 @@ static bool link_ipv6_enabled(Link *link) {
         if (link->network->bond)
                 return false;
 
-        if (manager_sysctl_ipv6_enabled(link->manager) == 0)
+        if (link_sysctl_ipv6_enabled(link) == 0)
                 return false;
 
         if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan"))
@@ -230,7 +244,7 @@ static bool link_ipv6_forward_enabled(Link *link) {
         if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
                 return false;
 
-        if (manager_sysctl_ipv6_enabled(link->manager) == 0)
+        if (link_sysctl_ipv6_enabled(link) == 0)
                 return false;
 
         return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
@@ -541,6 +555,7 @@ static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
                 .rtnl_extended_attrs = true,
                 .ifindex = ifindex,
                 .iftype = iftype,
+                .sysctl_ipv6_enabled = -1,
         };
 
         link->ifname = strdup(ifname);
diff --git a/src/network/networkd-link.h b/src/network/networkd-link.h
index f2aa504f1f..80fc4baee6 100644
--- a/src/network/networkd-link.h
+++ b/src/network/networkd-link.h
@@ -126,6 +126,8 @@ typedef struct Link {
         /* For speed meter */
         struct rtnl_link_stats64 stats_old, stats_new;
         bool stats_updated;
+
+        int sysctl_ipv6_enabled;
 } Link;
 
 typedef int (*link_netlink_message_handler_t)(sd_netlink*, sd_netlink_message*, Link*);
@@ -192,6 +194,8 @@ uint32_t link_get_dhcp_route_table(Link *link);
 uint32_t link_get_ipv6_accept_ra_route_table(Link *link);
 int link_request_set_routes(Link *link);
 
+int link_sysctl_ipv6_enabled(Link *link);
+
 #define ADDRESS_FMT_VAL(address)                   \
         be32toh((address).s_addr) >> 24,           \
         (be32toh((address).s_addr) >> 16) & 0xFFu, \
diff --git a/src/network/networkd-manager.c b/src/network/networkd-manager.c
index e1f4d7623f..92e3b0a0f1 100644
--- a/src/network/networkd-manager.c
+++ b/src/network/networkd-manager.c
@@ -1382,8 +1382,6 @@ int manager_new(Manager **ret) {
         if (!m->state_file)
                 return -ENOMEM;
 
-        m->sysctl_ipv6_enabled = -1;
-
         r = sd_event_default(&m->event);
         if (r < 0)
                 return r;
@@ -1886,18 +1884,3 @@ int manager_request_product_uuid(Manager *m, Link *link) {
 
         return 0;
 }
-
-int manager_sysctl_ipv6_enabled(Manager *manager) {
-        _cleanup_free_ char *value = NULL;
-        int r;
-
-        if (manager->sysctl_ipv6_enabled >= 0)
-                return manager->sysctl_ipv6_enabled;
-
-        r = sysctl_read_ip_property(AF_INET6, "all", "disable_ipv6", &value);
-        if (r < 0)
-                return log_warning_errno(r, "Failed to read net.ipv6.conf.all.disable_ipv6 sysctl property: %m");
-
-        manager->sysctl_ipv6_enabled = value[0] == '0';
-        return manager->sysctl_ipv6_enabled;
-}
diff --git a/src/network/networkd-manager.h b/src/network/networkd-manager.h
index c816d86d18..281e9cbac4 100644
--- a/src/network/networkd-manager.h
+++ b/src/network/networkd-manager.h
@@ -55,8 +55,6 @@ struct Manager {
         Set *rules_foreign;
         Set *rules_saved;
 
-        int sysctl_ipv6_enabled;
-
         /* For link speed meter*/
         bool use_speed_meter;
         sd_event_source *speed_meter_event_source;
@@ -100,6 +98,4 @@ Link *manager_dhcp6_prefix_get(Manager *m, struct in6_addr *addr);
 int manager_dhcp6_prefix_add(Manager *m, struct in6_addr *addr, Link *link);
 int manager_dhcp6_prefix_remove_all(Manager *m, Link *link);
 
-int manager_sysctl_ipv6_enabled(Manager *manager);
-
 DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_free);
diff --git a/src/network/networkd-route.c b/src/network/networkd-route.c
index b3a3d4134e..cd31548f94 100644
--- a/src/network/networkd-route.c
+++ b/src/network/networkd-route.c
@@ -500,7 +500,7 @@ int route_configure(
         assert(IN_SET(route->family, AF_INET, AF_INET6));
         assert(callback);
 
-        if (route->family == AF_INET6 && manager_sysctl_ipv6_enabled(link->manager) == 0) {
+        if (route->family == AF_INET6 && link_sysctl_ipv6_enabled(link) == 0) {
                 log_link_warning(link, "An IPv6 route is requested, but IPv6 is disabled by sysctl, ignoring.");
                 return 0;
         }
diff --git a/src/network/networkd-routing-policy-rule.c b/src/network/networkd-routing-policy-rule.c
index be7f2f225b..e4dca83071 100644
--- a/src/network/networkd-routing-policy-rule.c
+++ b/src/network/networkd-routing-policy-rule.c
@@ -484,7 +484,7 @@ int routing_policy_rule_configure(RoutingPolicyRule *rule, Link *link, link_netl
         assert(link->manager);
         assert(link->manager->rtnl);
 
-        if (rule->family == AF_INET6 && manager_sysctl_ipv6_enabled(link->manager) == 0) {
+        if (rule->family == AF_INET6 && link_sysctl_ipv6_enabled(link) == 0) {
                 log_link_warning(link, "An IPv6 routing policy rule is requested, but IPv6 is disabled by sysctl, ignoring.");
                 return 0;
         }