+ }
+
+ if (be32toh(message->magic) != DHCP_MAGIC_COOKIE) {
+ log_dhcp_client(client, "not a DHCP message: ignoring");
+ return 0;
+ }
+
+ if (message->op != BOOTREPLY) {
+ log_dhcp_client(client, "not a BOOTREPLY message: ignoring");
+ return 0;
+ }
+
+ if (message->htype != client->arp_type) {
+ log_dhcp_client(client, "packet type does not match client type");
+ return 0;
+ }
+
+ if (client->arp_type == ARPHRD_ETHER) {
+ expected_hlen = ETH_ALEN;
+ expected_chaddr = (const struct ether_addr *) &client->mac_addr;
+ } else {
+ /* Non-ethernet links expect zero chaddr */
+ expected_hlen = 0;
+ expected_chaddr = &zero_mac;
+ }
+
+ if (message->hlen != expected_hlen) {
+ log_dhcp_client(client, "unexpected packet hlen %d", message->hlen);
+ return 0;
+ }
+
+ if (memcmp(&message->chaddr[0], expected_chaddr, ETH_ALEN)) {
+ log_dhcp_client(client, "received chaddr does not match "
+ "expected: ignoring");
+ return 0;
+ }
+
+ if (client->state != DHCP_STATE_BOUND &&
+ be32toh(message->xid) != client->xid) {
+ /* in BOUND state, we may receive FORCERENEW with xid set by server,
+ so ignore the xid in this case */
+ log_dhcp_client(client, "received xid (%u) does not match "
+ "expected (%u): ignoring",
+ be32toh(message->xid), client->xid);
+ return 0;
+ }