1 files changed, 19 insertions, 23 deletions

diff --git a/include/linux/dccp.h b/include/linux/dccp.h
index 6080449fbec..61734e27abb 100644
--- a/include/linux/dccp.h
+++ b/include/linux/dccp.h
@@ -168,6 +168,8 @@ enum {
         DCCPO_MIN_CCID_SPECIFIC = 128,
         DCCPO_MAX_CCID_SPECIFIC = 255,
 };
+/* maximum size of a single TLV-encoded DCCP option (sans type/len bytes) */
+#define DCCP_SINGLE_OPT_MAXLEN  253
 
 /* DCCP CCIDS */
 enum {
@@ -176,29 +178,23 @@ enum {
 };
 
 /* DCCP features (RFC 4340 section 6.4) */
-enum {
+enum dccp_feature_numbers {
         DCCPF_RESERVED = 0,
         DCCPF_CCID = 1,
-        DCCPF_SHORT_SEQNOS = 2,         /* XXX: not yet implemented */
+        DCCPF_SHORT_SEQNOS = 2,
         DCCPF_SEQUENCE_WINDOW = 3,
-        DCCPF_ECN_INCAPABLE = 4,        /* XXX: not yet implemented */
+        DCCPF_ECN_INCAPABLE = 4,
         DCCPF_ACK_RATIO = 5,
         DCCPF_SEND_ACK_VECTOR = 6,
         DCCPF_SEND_NDP_COUNT = 7,
         DCCPF_MIN_CSUM_COVER = 8,
-        DCCPF_DATA_CHECKSUM = 9,        /* XXX: not yet implemented */
+        DCCPF_DATA_CHECKSUM = 9,
         /* 10-127 reserved */
         DCCPF_MIN_CCID_SPECIFIC = 128,
+        DCCPF_SEND_LEV_RATE = 192,      /* RFC 4342, sec. 8.4 */
         DCCPF_MAX_CCID_SPECIFIC = 255,
 };
 
-/* this structure is argument to DCCP_SOCKOPT_CHANGE_X */
-struct dccp_so_feat {
-        __u8 dccpsf_feat;
-        __u8 __user *dccpsf_val;
-        __u8 dccpsf_len;
-};
-
 /* DCCP socket options */
 #define DCCP_SOCKOPT_PACKET_SIZE        1 /* XXX deprecated, without effect */
 #define DCCP_SOCKOPT_SERVICE            2
@@ -208,6 +204,10 @@ struct dccp_so_feat {
 #define DCCP_SOCKOPT_SERVER_TIMEWAIT    6
 #define DCCP_SOCKOPT_SEND_CSCOV         10
 #define DCCP_SOCKOPT_RECV_CSCOV         11
+#define DCCP_SOCKOPT_AVAILABLE_CCIDS    12
+#define DCCP_SOCKOPT_CCID               13
+#define DCCP_SOCKOPT_TX_CCID            14
+#define DCCP_SOCKOPT_RX_CCID            15
 #define DCCP_SOCKOPT_CCID_RX_INFO       128
 #define DCCP_SOCKOPT_CCID_TX_INFO       192
 
@@ -360,7 +360,6 @@ static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
 #define DCCPF_INITIAL_SEQUENCE_WINDOW           100
 #define DCCPF_INITIAL_ACK_RATIO                 2
 #define DCCPF_INITIAL_CCID                      DCCPC_CCID2
-#define DCCPF_INITIAL_SEND_ACK_VECTOR           1
 /* FIXME: for now we're default to 1 but it should really be 0 */
 #define DCCPF_INITIAL_SEND_NDP_COUNT            1
 
@@ -370,20 +369,11 @@ static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
   * Will be used to pass the state from dccp_request_sock to dccp_sock.
   *
   * @dccpms_sequence_window - Sequence Window Feature (section 7.5.2)
-  * @dccpms_ccid - Congestion Control Id (CCID) (section 10)
-  * @dccpms_send_ack_vector - Send Ack Vector Feature (section 11.5)
-  * @dccpms_send_ndp_count - Send NDP Count Feature (7.7.2)
-  * @dccpms_ack_ratio - Ack Ratio Feature (section 11.3)
   * @dccpms_pending - List of features being negotiated
   * @dccpms_conf -
   */
 struct dccp_minisock {
         __u64                   dccpms_sequence_window;
-        __u8                    dccpms_rx_ccid;
-        __u8                    dccpms_tx_ccid;
-        __u8                    dccpms_send_ack_vector;
-        __u8                    dccpms_send_ndp_count;
-        __u8                    dccpms_ack_ratio;
         struct list_head        dccpms_pending;
         struct list_head        dccpms_conf;
 };
@@ -411,6 +401,7 @@ extern void dccp_minisock_init(struct dccp_minisock *dmsk);
  * @dreq_iss: initial sequence number sent on the Response (RFC 4340, 7.1)
  * @dreq_isr: initial sequence number received on the Request
  * @dreq_service: service code present on the Request (there is just one)
+ * @dreq_featneg: feature negotiation options for this connection
  * The following two fields are analogous to the ones in dccp_sock:
  * @dreq_timestamp_echo: last received timestamp to echo (13.1)
  * @dreq_timestamp_echo: the time of receiving the last @dreq_timestamp_echo
@@ -420,6 +411,7 @@ struct dccp_request_sock {
         __u64                    dreq_iss;
         __u64                    dreq_isr;
         __be32                   dreq_service;
+        struct list_head         dreq_featneg;
         __u32                    dreq_timestamp_echo;
         __u32                    dreq_timestamp_time;
 };
@@ -493,10 +485,12 @@ struct dccp_ackvec;
  * @dccps_r_ack_ratio - feature-remote Ack Ratio
  * @dccps_pcslen - sender   partial checksum coverage (via sockopt)
  * @dccps_pcrlen - receiver partial checksum coverage (via sockopt)
+ * @dccps_send_ndp_count - local Send NDP Count feature (7.7.2)
  * @dccps_ndp_count - number of Non Data Packets since last data packet
  * @dccps_mss_cache - current value of MSS (path MTU minus header sizes)
  * @dccps_rate_last - timestamp for rate-limiting DCCP-Sync (RFC 4340, 7.5.4)
  * @dccps_minisock - associated minisock (accessed via dccp_msk)
+ * @dccps_featneg - tracks feature-negotiation state (mostly during handshake)
  * @dccps_hc_rx_ackvec - rx half connection ack vector
  * @dccps_hc_rx_ccid - CCID used for the receiver (or receiving half-connection)
  * @dccps_hc_tx_ccid - CCID used for the sender (or sending half-connection)
@@ -529,11 +523,13 @@ struct dccp_sock {
         __u32                           dccps_timestamp_time;
         __u16                           dccps_l_ack_ratio;
         __u16                           dccps_r_ack_ratio;
-        __u16                           dccps_pcslen;
-        __u16                           dccps_pcrlen;
+        __u8                            dccps_pcslen:4;
+        __u8                            dccps_pcrlen:4;
+        __u8                            dccps_send_ndp_count:1;
         __u64                           dccps_ndp_count:48;
         unsigned long                   dccps_rate_last;
         struct dccp_minisock            dccps_minisock;
+        struct list_head                dccps_featneg;
         struct dccp_ackvec              *dccps_hc_rx_ackvec;
         struct ccid                     *dccps_hc_rx_ccid;
         struct ccid                     *dccps_hc_tx_ccid;