dccp: Processing Confirm options

Analogous to the previous patch, this adds code to interpret incoming Confirm
feature-negotiation options. Both functions operate on the feature-negotiation
list of either the request_sock (server) or the dccp_sock (client).

Thanks to Wei Yongjun for pointing out that it is overly restrictive to check
the entire list of confirmed SP values.

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 14 deletions

diff --git a/net/dccp/options.c b/net/dccp/options.c
index 2c444c199725..debb1008c7ad 100644
--- a/net/dccp/options.c
+++ b/net/dccp/options.c
@@ -134,26 +134,14 @@ int dccp_parse_options(struct sock *sk, struct dccp_request_sock *dreq,
                         dccp_pr_debug("%s opt: NDP count=%llu\n", dccp_role(sk),
                                       (unsigned long long)opt_recv->dccpor_ndp);
                         break;
-                case DCCPO_CHANGE_L:
-                case DCCPO_CHANGE_R:
-                        if (pkt_type == DCCP_PKT_DATA)
+                case DCCPO_CHANGE_L ... DCCPO_CONFIRM_R:
+                        if (pkt_type == DCCP_PKT_DATA)      /* RFC 4340, 6 */
                                 break;
                         rc = dccp_feat_parse_options(sk, dreq, mandatory, opt,
                                                     *value, value + 1, len - 1);
                         if (rc)
                                 goto out_featneg_failed;
                         break;
-                case DCCPO_CONFIRM_L:
-                        /* fall through */
-                case DCCPO_CONFIRM_R:
-                        if (pkt_type == DCCP_PKT_DATA)
-                                break;
-                        if (len < 2)    /* FIXME this disallows empty confirm */
-                                goto out_invalid_option;
-                        if (dccp_feat_confirm_recv(sk, opt, *value,
-                                                   value + 1, len - 1))
-                                goto out_invalid_option;
-                        break;
                 case DCCPO_ACK_VECTOR_0:
                 case DCCPO_ACK_VECTOR_1:
                         if (dccp_packet_without_ack(skb))   /* RFC 4340, 11.4 */