[DCCP]: Ignore Ack Vectors / Elapsed Time on DCCP-Request also

Small update with regard to RFC 4340 (references added as documentation):
on Requests, Ack Vectors / Elapsed Time should be ignored.
Length handling of Elapsed Time also simplified.

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/dccp/options.c b/net/dccp/options.c
index d286cff..523250b 100644 (file)
--- a/net/dccp/options.c
+++ b/net/dccp/options.c
@@ -136,7 +136,7 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb)
                        break;
                case DCCPO_ACK_VECTOR_0:
                case DCCPO_ACK_VECTOR_1:
-                       if (pkt_type == DCCP_PKT_DATA)
+                       if (dccp_packet_without_ack(skb))   /* RFC 4340, 11.4 */
                                break;
 
                        if (dccp_msk(sk)->dccpms_send_ack_vector &&
@@ -194,18 +194,17 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb)
                                opt_recv->dccpor_elapsed_time = elapsed_time;
                        break;
                case DCCPO_ELAPSED_TIME:
-                       if (len != 2 && len != 4)
-                               goto out_invalid_option;
-
-                       if (pkt_type == DCCP_PKT_DATA)
-                               continue;
+                       if (dccp_packet_without_ack(skb))   /* RFC 4340, 13.2 */
+                               break;
 
                        if (len == 2) {
                                __be16 opt_val2 = get_unaligned((__be16 *)value);
                                elapsed_time = ntohs(opt_val2);
-                       } else {
+                       } else if (len == 4) {
                                opt_val = get_unaligned((__be32 *)value);
                                elapsed_time = ntohl(opt_val);
+                       } else {
+                               goto out_invalid_option;
                        }
 
                        if (elapsed_time > opt_recv->dccpor_elapsed_time)