1 files changed, 287 insertions, 44 deletions

diff --git a/src/resolve/resolved-link.c b/src/resolve/resolved-link.c
index ddd9427dab..b203f19dbb 100644
--- a/src/resolve/resolved-link.c
+++ b/src/resolve/resolved-link.c
@@ -46,7 +46,9 @@ int link_new(Manager *m, Link **ret, int ifindex) {
                 return -ENOMEM;
 
         l->ifindex = ifindex;
-        l->llmnr_support = SUPPORT_YES;
+        l->llmnr_support = RESOLVE_SUPPORT_YES;
+        l->mdns_support = RESOLVE_SUPPORT_NO;
+        l->dnssec_mode = _DNSSEC_MODE_INVALID;
 
         r = hashmap_put(m->links, INT_TO_PTR(ifindex), l);
         if (r < 0)
@@ -61,15 +63,27 @@ int link_new(Manager *m, Link **ret, int ifindex) {
         return 0;
 }
 
+void link_flush_settings(Link *l) {
+        assert(l);
+
+        l->llmnr_support = RESOLVE_SUPPORT_YES;
+        l->mdns_support = RESOLVE_SUPPORT_NO;
+        l->dnssec_mode = _DNSSEC_MODE_INVALID;
+
+        dns_server_unlink_all(l->dns_servers);
+        dns_search_domain_unlink_all(l->search_domains);
+
+        l->dnssec_negative_trust_anchors = set_free_free(l->dnssec_negative_trust_anchors);
+}
+
 Link *link_free(Link *l) {
         if (!l)
                 return NULL;
 
-        dns_server_unlink_marked(l->dns_servers);
-        dns_search_domain_unlink_all(l->search_domains);
+        link_flush_settings(l);
 
         while (l->addresses)
-                link_address_free(l->addresses);
+                (void) link_address_free(l->addresses);
 
         if (l->manager)
                 hashmap_remove(l->manager->links, INT_TO_PTR(l->ifindex));
@@ -77,17 +91,20 @@ Link *link_free(Link *l) {
         dns_scope_free(l->unicast_scope);
         dns_scope_free(l->llmnr_ipv4_scope);
         dns_scope_free(l->llmnr_ipv6_scope);
+        dns_scope_free(l->mdns_ipv4_scope);
+        dns_scope_free(l->mdns_ipv6_scope);
 
         free(l);
         return NULL;
 }
 
-static void link_allocate_scopes(Link *l) {
+void link_allocate_scopes(Link *l) {
         int r;
 
         assert(l);
 
-        if (l->dns_servers) {
+        if (link_relevant(l, AF_UNSPEC, false) &&
+            l->dns_servers) {
                 if (!l->unicast_scope) {
                         r = dns_scope_new(l->manager, &l->unicast_scope, l, DNS_PROTOCOL_DNS, AF_UNSPEC);
                         if (r < 0)
@@ -96,9 +113,9 @@ static void link_allocate_scopes(Link *l) {
         } else
                 l->unicast_scope = dns_scope_free(l->unicast_scope);
 
-        if (link_relevant(l, AF_INET) &&
-            l->llmnr_support != SUPPORT_NO &&
-            l->manager->llmnr_support != SUPPORT_NO) {
+        if (link_relevant(l, AF_INET, true) &&
+            l->llmnr_support != RESOLVE_SUPPORT_NO &&
+            l->manager->llmnr_support != RESOLVE_SUPPORT_NO) {
                 if (!l->llmnr_ipv4_scope) {
                         r = dns_scope_new(l->manager, &l->llmnr_ipv4_scope, l, DNS_PROTOCOL_LLMNR, AF_INET);
                         if (r < 0)
@@ -107,9 +124,9 @@ static void link_allocate_scopes(Link *l) {
         } else
                 l->llmnr_ipv4_scope = dns_scope_free(l->llmnr_ipv4_scope);
 
-        if (link_relevant(l, AF_INET6) &&
-            l->llmnr_support != SUPPORT_NO &&
-            l->manager->llmnr_support != SUPPORT_NO &&
+        if (link_relevant(l, AF_INET6, true) &&
+            l->llmnr_support != RESOLVE_SUPPORT_NO &&
+            l->manager->llmnr_support != RESOLVE_SUPPORT_NO &&
             socket_ipv6_is_supported()) {
                 if (!l->llmnr_ipv6_scope) {
                         r = dns_scope_new(l->manager, &l->llmnr_ipv6_scope, l, DNS_PROTOCOL_LLMNR, AF_INET6);
@@ -118,6 +135,28 @@ static void link_allocate_scopes(Link *l) {
                 }
         } else
                 l->llmnr_ipv6_scope = dns_scope_free(l->llmnr_ipv6_scope);
+
+        if (link_relevant(l, AF_INET, true) &&
+            l->mdns_support != RESOLVE_SUPPORT_NO &&
+            l->manager->mdns_support != RESOLVE_SUPPORT_NO) {
+                if (!l->mdns_ipv4_scope) {
+                        r = dns_scope_new(l->manager, &l->mdns_ipv4_scope, l, DNS_PROTOCOL_MDNS, AF_INET);
+                        if (r < 0)
+                                log_warning_errno(r, "Failed to allocate mDNS IPv4 scope: %m");
+                }
+        } else
+                l->mdns_ipv4_scope = dns_scope_free(l->mdns_ipv4_scope);
+
+        if (link_relevant(l, AF_INET6, true) &&
+            l->mdns_support != RESOLVE_SUPPORT_NO &&
+            l->manager->mdns_support != RESOLVE_SUPPORT_NO) {
+                if (!l->mdns_ipv6_scope) {
+                        r = dns_scope_new(l->manager, &l->mdns_ipv6_scope, l, DNS_PROTOCOL_MDNS, AF_INET6);
+                        if (r < 0)
+                                log_warning_errno(r, "Failed to allocate mDNS IPv6 scope: %m");
+                }
+        } else
+                l->mdns_ipv6_scope = dns_scope_free(l->mdns_ipv6_scope);
 }
 
 void link_add_rrs(Link *l, bool force_remove) {
@@ -159,6 +198,10 @@ static int link_update_dns_servers(Link *l) {
         assert(l);
 
         r = sd_network_link_get_dns(l->ifindex, &nameservers);
+        if (r == -ENODATA) {
+                r = 0;
+                goto clear;
+        }
         if (r < 0)
                 goto clear;
 
@@ -198,25 +241,137 @@ static int link_update_llmnr_support(Link *l) {
         assert(l);
 
         r = sd_network_link_get_llmnr(l->ifindex, &b);
+        if (r == -ENODATA) {
+                r = 0;
+                goto clear;
+        }
         if (r < 0)
                 goto clear;
 
-        r = parse_boolean(b);
-        if (r < 0) {
-                if (streq(b, "resolve"))
-                        l->llmnr_support = SUPPORT_RESOLVE;
-                else
-                        goto clear;
+        l->llmnr_support = resolve_support_from_string(b);
+        if (l->llmnr_support < 0) {
+                r = -EINVAL;
+                goto clear;
+        }
+
+        return 0;
+
+clear:
+        l->llmnr_support = RESOLVE_SUPPORT_YES;
+        return r;
+}
+
+static int link_update_mdns_support(Link *l) {
+        _cleanup_free_ char *b = NULL;
+        int r;
+
+        assert(l);
+
+        r = sd_network_link_get_mdns(l->ifindex, &b);
+        if (r == -ENODATA) {
+                r = 0;
+                goto clear;
+        }
+        if (r < 0)
+                goto clear;
+
+        l->mdns_support = resolve_support_from_string(b);
+        if (l->mdns_support < 0) {
+                r = -EINVAL;
+                goto clear;
+        }
+
+        return 0;
+
+clear:
+        l->mdns_support = RESOLVE_SUPPORT_NO;
+        return r;
+}
+
+void link_set_dnssec_mode(Link *l, DnssecMode mode) {
+
+        assert(l);
+
+        if (l->dnssec_mode == mode)
+                return;
+
+        if ((l->dnssec_mode == _DNSSEC_MODE_INVALID) ||
+            (l->dnssec_mode == DNSSEC_NO && mode != DNSSEC_NO) ||
+            (l->dnssec_mode == DNSSEC_ALLOW_DOWNGRADE && mode == DNSSEC_YES)) {
+
+                /* When switching from non-DNSSEC mode to DNSSEC mode, flush the cache. Also when switching from the
+                 * allow-downgrade mode to full DNSSEC mode, flush it too. */
+                if (l->unicast_scope)
+                        dns_cache_flush(&l->unicast_scope->cache);
+        }
+
+        l->dnssec_mode = mode;
+}
+
+static int link_update_dnssec_mode(Link *l) {
+        _cleanup_free_ char *m = NULL;
+        DnssecMode mode;
+        int r;
+
+        assert(l);
+
+        r = sd_network_link_get_dnssec(l->ifindex, &m);
+        if (r == -ENODATA) {
+                r = 0;
+                goto clear;
+        }
+        if (r < 0)
+                goto clear;
+
+        mode = dnssec_mode_from_string(m);
+        if (mode < 0) {
+                r = -EINVAL;
+                goto clear;
+        }
+
+        link_set_dnssec_mode(l, mode);
+
+        return 0;
 
-        } else if (r > 0)
-                l->llmnr_support = SUPPORT_YES;
-        else
-                l->llmnr_support = SUPPORT_NO;
+clear:
+        l->dnssec_mode = _DNSSEC_MODE_INVALID;
+        return r;
+}
+
+static int link_update_dnssec_negative_trust_anchors(Link *l) {
+        _cleanup_strv_free_ char **ntas = NULL;
+        _cleanup_set_free_free_ Set *ns = NULL;
+        char **i;
+        int r;
+
+        assert(l);
+
+        r = sd_network_link_get_dnssec_negative_trust_anchors(l->ifindex, &ntas);
+        if (r == -ENODATA) {
+                r = 0;
+                goto clear;
+        }
+        if (r < 0)
+                goto clear;
+
+        ns = set_new(&dns_name_hash_ops);
+        if (!ns)
+                return -ENOMEM;
+
+        STRV_FOREACH(i, ntas) {
+                r = set_put_strdup(ns, *i);
+                if (r < 0)
+                        return r;
+        }
+
+        set_free_free(l->dnssec_negative_trust_anchors);
+        l->dnssec_negative_trust_anchors = ns;
+        ns = NULL;
 
         return 0;
 
 clear:
-        l->llmnr_support = SUPPORT_YES;
+        l->dnssec_negative_trust_anchors = set_free_free(l->dnssec_negative_trust_anchors);
         return r;
 }
 
@@ -228,6 +383,11 @@ static int link_update_search_domains(Link *l) {
         assert(l);
 
         r = sd_network_link_get_domains(l->ifindex, &domains);
+        if (r == -ENODATA) {
+                /* networkd knows nothing about this interface, and that's fine. */
+                r = 0;
+                goto clear;
+        }
         if (r < 0)
                 goto clear;
 
@@ -257,46 +417,109 @@ clear:
         return r;
 }
 
-int link_update_monitor(Link *l) {
+static int link_is_unmanaged(Link *l) {
+        _cleanup_free_ char *state = NULL;
         int r;
 
         assert(l);
 
-        link_update_dns_servers(l);
-        link_update_llmnr_support(l);
-        link_allocate_scopes(l);
+        r = sd_network_link_get_setup_state(l->ifindex, &state);
+        if (r == -ENODATA)
+                return 1;
+        if (r < 0)
+                return r;
+
+        return STR_IN_SET(state, "pending", "unmanaged");
+}
+
+static void link_read_settings(Link *l) {
+        int r;
+
+        assert(l);
+
+        /* Read settings from networkd, except when networkd is not managing this interface. */
+
+        r = link_is_unmanaged(l);
+        if (r < 0) {
+                log_warning_errno(r, "Failed to determine whether interface %s is managed: %m", l->name);
+                return;
+        }
+        if (r > 0) {
+
+                /* If this link used to be managed, but is now unmanaged, flush all our settings -- but only once. */
+                if (l->is_managed)
+                        link_flush_settings(l);
+
+                l->is_managed = false;
+                return;
+        }
+
+        l->is_managed = true;
+
+        r = link_update_dns_servers(l);
+        if (r < 0)
+                log_warning_errno(r, "Failed to read DNS servers for interface %s, ignoring: %m", l->name);
+
+        r = link_update_llmnr_support(l);
+        if (r < 0)
+                log_warning_errno(r, "Failed to read LLMNR support for interface %s, ignoring: %m", l->name);
+
+        r = link_update_mdns_support(l);
+        if (r < 0)
+                log_warning_errno(r, "Failed to read mDNS support for interface %s, ignoring: %m", l->name);
+
+        r = link_update_dnssec_mode(l);
+        if (r < 0)
+                log_warning_errno(r, "Failed to read DNSSEC mode for interface %s, ignoring: %m", l->name);
+
+        r = link_update_dnssec_negative_trust_anchors(l);
+        if (r < 0)
+                log_warning_errno(r, "Failed to read DNSSEC negative trust anchors for interface %s, ignoring: %m", l->name);
 
         r = link_update_search_domains(l);
         if (r < 0)
                 log_warning_errno(r, "Failed to read search domains for interface %s, ignoring: %m", l->name);
+}
 
+int link_update_monitor(Link *l) {
+        assert(l);
+
+        link_read_settings(l);
+        link_allocate_scopes(l);
         link_add_rrs(l, false);
 
         return 0;
 }
 
-bool link_relevant(Link *l, int family) {
+bool link_relevant(Link *l, int family, bool multicast) {
         _cleanup_free_ char *state = NULL;
         LinkAddress *a;
 
         assert(l);
 
-        /* A link is relevant if it isn't a loopback or pointopoint
-         * device, has a link beat, can do multicast and has at least
-         * one relevant IP address */
+        /* A link is relevant for multicast traffic if it isn't a loopback or pointopoint device, has a link beat, can
+         * do multicast and has at least one relevant IP address */
 
-        if (l->flags & (IFF_LOOPBACK|IFF_POINTOPOINT|IFF_DORMANT))
+        if (l->flags & (IFF_LOOPBACK|IFF_DORMANT))
                 return false;
 
-        if ((l->flags & (IFF_UP|IFF_LOWER_UP|IFF_MULTICAST)) != (IFF_UP|IFF_LOWER_UP|IFF_MULTICAST))
+        if ((l->flags & (IFF_UP|IFF_LOWER_UP)) != (IFF_UP|IFF_LOWER_UP))
                 return false;
 
+        if (multicast) {
+                if (l->flags & IFF_POINTOPOINT)
+                        return false;
+
+                if ((l->flags & IFF_MULTICAST) != IFF_MULTICAST)
+                        return false;
+        }
+
         sd_network_link_get_operational_state(l->ifindex, &state);
         if (state && !STR_IN_SET(state, "unknown", "degraded", "routable"))
                 return false;
 
         LIST_FOREACH(addresses, a, l->addresses)
-                if (a->family == family && link_address_relevant(a))
+                if ((family == AF_UNSPEC || a->family == family) && link_address_relevant(a))
                         return true;
 
         return false;
@@ -320,12 +543,8 @@ DnsServer* link_set_dns_server(Link *l, DnsServer *s) {
         if (l->current_dns_server == s)
                 return s;
 
-        if (s) {
-                _cleanup_free_ char *ip = NULL;
-
-                in_addr_to_string(s->family, &s->address, &ip);
-                log_info("Switching to DNS server %s for interface %s.", strna(ip), l->name);
-        }
+        if (s)
+                log_info("Switching to DNS server %s for interface %s.", dns_server_string(s), l->name);
 
         dns_server_unref(l->current_dns_server);
         l->current_dns_server = dns_server_ref(s);
@@ -361,6 +580,30 @@ void link_next_dns_server(Link *l) {
         link_set_dns_server(l, l->dns_servers);
 }
 
+DnssecMode link_get_dnssec_mode(Link *l) {
+        assert(l);
+
+        if (l->dnssec_mode != _DNSSEC_MODE_INVALID)
+                return l->dnssec_mode;
+
+        return manager_get_dnssec_mode(l->manager);
+}
+
+bool link_dnssec_supported(Link *l) {
+        DnsServer *server;
+
+        assert(l);
+
+        if (link_get_dnssec_mode(l) == DNSSEC_NO)
+                return false;
+
+        server = link_get_dns_server(l);
+        if (server)
+                return dns_server_dnssec_supported(server);
+
+        return true;
+}
+
 int link_address_new(Link *l, LinkAddress **ret, int family, const union in_addr_union *in_addr) {
         LinkAddress *a;
 
@@ -422,8 +665,8 @@ void link_address_add_rrs(LinkAddress *a, bool force_remove) {
                 if (!force_remove &&
                     link_address_relevant(a) &&
                     a->link->llmnr_ipv4_scope &&
-                    a->link->llmnr_support == SUPPORT_YES &&
-                    a->link->manager->llmnr_support == SUPPORT_YES) {
+                    a->link->llmnr_support == RESOLVE_SUPPORT_YES &&
+                    a->link->manager->llmnr_support == RESOLVE_SUPPORT_YES) {
 
                         if (!a->link->manager->llmnr_host_ipv4_key) {
                                 a->link->manager->llmnr_host_ipv4_key = dns_resource_key_new(DNS_CLASS_IN, DNS_TYPE_A, a->link->manager->llmnr_hostname);
@@ -479,8 +722,8 @@ void link_address_add_rrs(LinkAddress *a, bool force_remove) {
                 if (!force_remove &&
                     link_address_relevant(a) &&
                     a->link->llmnr_ipv6_scope &&
-                    a->link->llmnr_support == SUPPORT_YES &&
-                    a->link->manager->llmnr_support == SUPPORT_YES) {
+                    a->link->llmnr_support == RESOLVE_SUPPORT_YES &&
+                    a->link->manager->llmnr_support == RESOLVE_SUPPORT_YES) {
 
                         if (!a->link->manager->llmnr_host_ipv6_key) {
                                 a->link->manager->llmnr_host_ipv6_key = dns_resource_key_new(DNS_CLASS_IN, DNS_TYPE_AAAA, a->link->manager->llmnr_hostname);