resolved: properly handle MTU logic

[elogind.git] / src / resolve / resolved-dns-scope.c

diff --git a/src/resolve/resolved-dns-scope.c b/src/resolve/resolved-dns-scope.c
index 0a70cb1f0f6486ff9e79fcc91069d305b09cb0e0..a39e705a3ba60c39df5d30bf13d3beab231fc6f5 100644 (file)
--- a/src/resolve/resolved-dns-scope.c
+++ b/src/resolve/resolved-dns-scope.c
@@ -102,8 +102,19 @@ int dns_scope_send(DnsScope *s, DnsPacket *p) {
                         return -EMSGSIZE;
 
                 ifindex = s->link->ifindex;
+        } else {
+                uint32_t mtu;
+
+                mtu = manager_find_mtu(s->manager);
+                if (mtu > 0) {
+                        if (p->size > mtu)
+                                return -EMSGSIZE;
+                }
         }
 
+        if (p->size > DNS_PACKET_UNICAST_SIZE_MAX)
+                return -EMSGSIZE;
+
         if (srv->family == AF_INET)
                 r = manager_dns_ipv4_send(s->manager, srv, ifindex, p);
         else if (srv->family == AF_INET6)