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Diffstat (limited to 'src/resolve/resolved-link.c')
-rw-r--r--src/resolve/resolved-link.c146
1 files changed, 125 insertions, 21 deletions
diff --git a/src/resolve/resolved-link.c b/src/resolve/resolved-link.c
index 928307e004..b203f19dbb 100644
--- a/src/resolve/resolved-link.c
+++ b/src/resolve/resolved-link.c
@@ -63,15 +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_all(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));
@@ -82,18 +94,17 @@ Link *link_free(Link *l) {
dns_scope_free(l->mdns_ipv4_scope);
dns_scope_free(l->mdns_ipv6_scope);
- set_free_free(l->dnssec_negative_trust_anchors);
-
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)
@@ -102,7 +113,7 @@ static void link_allocate_scopes(Link *l) {
} else
l->unicast_scope = dns_scope_free(l->unicast_scope);
- if (link_relevant(l, AF_INET) &&
+ 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) {
@@ -113,7 +124,7 @@ 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) &&
+ if (link_relevant(l, AF_INET6, true) &&
l->llmnr_support != RESOLVE_SUPPORT_NO &&
l->manager->llmnr_support != RESOLVE_SUPPORT_NO &&
socket_ipv6_is_supported()) {
@@ -125,7 +136,7 @@ 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) &&
+ 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) {
@@ -136,7 +147,7 @@ static void link_allocate_scopes(Link *l) {
} else
l->mdns_ipv4_scope = dns_scope_free(l->mdns_ipv4_scope);
- if (link_relevant(l, AF_INET6) &&
+ 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) {
@@ -277,8 +288,29 @@ clear:
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);
@@ -291,12 +323,14 @@ static int link_update_dnssec_mode(Link *l) {
if (r < 0)
goto clear;
- l->dnssec_mode = dnssec_mode_from_string(m);
- if (l->dnssec_mode < 0) {
+ mode = dnssec_mode_from_string(m);
+ if (mode < 0) {
r = -EINVAL;
goto clear;
}
+ link_set_dnssec_mode(l, mode);
+
return 0;
clear:
@@ -383,11 +417,45 @@ 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);
+
+ 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);
@@ -411,35 +479,47 @@ int link_update_monitor(Link *l) {
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;
@@ -500,6 +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;
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-07-25 05:03:48 +0000