1 files changed, 432 insertions, 0 deletions
diff --git a/include/linux/dccp.h b/include/linux/dccp.h
new file mode 100644
index 000000000000..e3b4bf7346bb
--- /dev/null
+++ b/include/linux/dccp.h
@@ -0,0 +1,432 @@
+#ifndef _LINUX_DCCP_H
+#define _LINUX_DCCP_H
+#include <linux/in.h>
+#include <linux/list.h>
+#include <linux/types.h>
+#include <linux/uio.h>
+#include <linux/workqueue.h>
+#include <net/inet_connection_sock.h>
+#include <net/sock.h>
+#include <net/tcp_states.h>
+#include <net/tcp.h>
+/* FIXME: this is utterly wrong */
+struct sockaddr_dccp {
+        struct sockaddr_in      in;
+        unsigned int            service;
+};
+enum dccp_state {
+        DCCP_OPEN       = TCP_ESTABLISHED,
+        DCCP_REQUESTING = TCP_SYN_SENT,
+        DCCP_PARTOPEN   = TCP_FIN_WAIT1, /* FIXME:
+                                            This mapping is horrible, but TCP has
+                                            no matching state for DCCP_PARTOPEN,
+                                            as TCP_SYN_RECV is already used by
+                                            DCCP_RESPOND, why don't stop using TCP
+                                            mapping of states? OK, now we don't use
+                                            sk_stream_sendmsg anymore, so doesn't
+                                            seem to exist any reason for us to
+                                            do the TCP mapping here */
+        DCCP_LISTEN     = TCP_LISTEN,
+        DCCP_RESPOND    = TCP_SYN_RECV,
+        DCCP_CLOSING    = TCP_CLOSING,
+        DCCP_TIME_WAIT  = TCP_TIME_WAIT,
+        DCCP_CLOSED     = TCP_CLOSE,
+        DCCP_MAX_STATES = TCP_MAX_STATES,
+};
+#define DCCP_STATE_MASK 0xf
+#define DCCP_ACTION_FIN (1<<7)
+enum {
+        DCCPF_OPEN       = TCPF_ESTABLISHED,
+        DCCPF_REQUESTING = TCPF_SYN_SENT,
+        DCCPF_PARTOPEN   = TCPF_FIN_WAIT1,
+        DCCPF_LISTEN     = TCPF_LISTEN,
+        DCCPF_RESPOND    = TCPF_SYN_RECV,
+        DCCPF_CLOSING    = TCPF_CLOSING,
+        DCCPF_TIME_WAIT  = TCPF_TIME_WAIT,
+        DCCPF_CLOSED     = TCPF_CLOSE,
+};
+/**
+ * struct dccp_hdr - generic part of DCCP packet header
+ *
+ * @dccph_sport - Relevant port on the endpoint that sent this packet
+ * @dccph_dport - Relevant port on the other endpoint
+ * @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words
+ * @dccph_ccval - Used by the HC-Sender CCID
+ * @dccph_cscov - Parts of the packet that are covered by the Checksum field
+ * @dccph_checksum - Internet checksum, depends on dccph_cscov
+ * @dccph_x - 0 = 24 bit sequence number, 1 = 48
+ * @dccph_type - packet type, see DCCP_PKT_ prefixed macros
+ * @dccph_seq - sequence number high or low order 24 bits, depends on dccph_x
+ */
+struct dccp_hdr {
+        __u16   dccph_sport,
+                dccph_dport;
+        __u8    dccph_doff;
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+        __u8    dccph_cscov:4,
+                dccph_ccval:4;
+#elif defined(__BIG_ENDIAN_BITFIELD)
+        __u8    dccph_ccval:4,
+                dccph_cscov:4;
+#else
+#error  "Adjust your <asm/byteorder.h> defines"
+#endif
+        __u16   dccph_checksum;
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+        __u32   dccph_x:1,
+                dccph_type:4,
+                dccph_reserved:3,
+                dccph_seq:24;
+#elif defined(__BIG_ENDIAN_BITFIELD)
+        __u32   dccph_reserved:3,
+                dccph_type:4,
+                dccph_x:1,
+                dccph_seq:24;
+#else
+#error  "Adjust your <asm/byteorder.h> defines"
+#endif
+};
+static inline struct dccp_hdr *dccp_hdr(const struct sk_buff *skb)
+{
+        return (struct dccp_hdr *)skb->h.raw;
+}
+/**
+ * struct dccp_hdr_ext - the low bits of a 48 bit seq packet
+ *
+ * @dccph_seq_low - low 24 bits of a 48 bit seq packet
+ */
+struct dccp_hdr_ext {
+        __u32   dccph_seq_low;
+};
+static inline struct dccp_hdr_ext *dccp_hdrx(const struct sk_buff *skb)
+{
+        return (struct dccp_hdr_ext *)(skb->h.raw + sizeof(struct dccp_hdr));
+}
+static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb)
+{
+        const struct dccp_hdr *dh = dccp_hdr(skb);
+        return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0);
+}
+static inline __u64 dccp_hdr_seq(const struct sk_buff *skb)
+{
+        const struct dccp_hdr *dh = dccp_hdr(skb);
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+        __u64 seq_nr = ntohl(dh->dccph_seq << 8);
+#elif defined(__BIG_ENDIAN_BITFIELD)
+        __u64 seq_nr = ntohl(dh->dccph_seq);
+#else
+#error  "Adjust your <asm/byteorder.h> defines"
+#endif
+        if (dh->dccph_x != 0)
+                seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(skb)->dccph_seq_low);
+        return seq_nr;
+}
+/**
+ * struct dccp_hdr_request - Conection initiation request header
+ *
+ * @dccph_req_service - Service to which the client app wants to connect
+ * @dccph_req_options - list of options (must be a multiple of 32 bits
+ */
+struct dccp_hdr_request {
+        __u32   dccph_req_service;
+};
+static inline struct dccp_hdr_request *dccp_hdr_request(struct sk_buff *skb)
+{
+        return (struct dccp_hdr_request *)(skb->h.raw + dccp_basic_hdr_len(skb));
+}
+/**
+ * struct dccp_hdr_ack_bits - acknowledgment bits common to most packets
+ *
+ * @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR
+ * @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR
+ */
+struct dccp_hdr_ack_bits {
+        __u32   dccph_reserved1:8,
+                dccph_ack_nr_high:24;
+        __u32   dccph_ack_nr_low;
+};
+static inline struct dccp_hdr_ack_bits *dccp_hdr_ack_bits(const struct sk_buff *skb)
+{
+        return (struct dccp_hdr_ack_bits *)(skb->h.raw + dccp_basic_hdr_len(skb));
+}
+static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb)
+{
+        const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb);
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+        return (((u64)ntohl(dhack->dccph_ack_nr_high << 8)) << 32) + ntohl(dhack->dccph_ack_nr_low);
+#elif defined(__BIG_ENDIAN_BITFIELD)
+        return (((u64)ntohl(dhack->dccph_ack_nr_high)) << 32) + ntohl(dhack->dccph_ack_nr_low);
+#else
+#error  "Adjust your <asm/byteorder.h> defines"
+#endif
+}
+/**
+ * struct dccp_hdr_response - Conection initiation response header
+ *
+ * @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR
+ * @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR
+ * @dccph_resp_service - Echoes the Service Code on a received DCCP-Request
+ * @dccph_resp_options - list of options (must be a multiple of 32 bits
+ */
+struct dccp_hdr_response {
+        struct dccp_hdr_ack_bits        dccph_resp_ack;
+        __u32                           dccph_resp_service;
+};
+static inline struct dccp_hdr_response *dccp_hdr_response(struct sk_buff *skb)
+{
+        return (struct dccp_hdr_response *)(skb->h.raw + dccp_basic_hdr_len(skb));
+}
+/**
+ * struct dccp_hdr_reset - Unconditionally shut down a connection
+ *
+ * @dccph_reset_service - Echoes the Service Code on a received DCCP-Request
+ * @dccph_reset_options - list of options (must be a multiple of 32 bits
+ */
+struct dccp_hdr_reset {
+        struct dccp_hdr_ack_bits        dccph_reset_ack;
+        __u8                            dccph_reset_code,
+                                        dccph_reset_data[3];
+};
+static inline struct dccp_hdr_reset *dccp_hdr_reset(struct sk_buff *skb)
+{
+        return (struct dccp_hdr_reset *)(skb->h.raw + dccp_basic_hdr_len(skb));
+}
+enum dccp_pkt_type {
+        DCCP_PKT_REQUEST = 0,
+        DCCP_PKT_RESPONSE,
+        DCCP_PKT_DATA,
+        DCCP_PKT_ACK,
+        DCCP_PKT_DATAACK,
+        DCCP_PKT_CLOSEREQ,
+        DCCP_PKT_CLOSE,
+        DCCP_PKT_RESET,
+        DCCP_PKT_SYNC,
+        DCCP_PKT_SYNCACK,
+        DCCP_PKT_INVALID,
+};
+#define DCCP_NR_PKT_TYPES DCCP_PKT_INVALID
+static inline unsigned int dccp_packet_hdr_len(const __u8 type)
+{
+        if (type == DCCP_PKT_DATA)
+                return 0;
+        if (type == DCCP_PKT_DATAACK    ||
+            type == DCCP_PKT_ACK        ||
+            type == DCCP_PKT_SYNC       ||
+            type == DCCP_PKT_SYNCACK    ||
+            type == DCCP_PKT_CLOSE      ||
+            type == DCCP_PKT_CLOSEREQ)
+                return sizeof(struct dccp_hdr_ack_bits);
+        if (type == DCCP_PKT_REQUEST)
+                return sizeof(struct dccp_hdr_request);
+        if (type == DCCP_PKT_RESPONSE)
+                return sizeof(struct dccp_hdr_response);
+        return sizeof(struct dccp_hdr_reset);
+}
+static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
+{
+        return dccp_basic_hdr_len(skb) +
+               dccp_packet_hdr_len(dccp_hdr(skb)->dccph_type);
+}
+enum dccp_reset_codes {
+        DCCP_RESET_CODE_UNSPECIFIED = 0,
+        DCCP_RESET_CODE_CLOSED,
+        DCCP_RESET_CODE_ABORTED,
+        DCCP_RESET_CODE_NO_CONNECTION,
+        DCCP_RESET_CODE_PACKET_ERROR,
+        DCCP_RESET_CODE_OPTION_ERROR,
+        DCCP_RESET_CODE_MANDATORY_ERROR,
+        DCCP_RESET_CODE_CONNECTION_REFUSED,
+        DCCP_RESET_CODE_BAD_SERVICE_CODE,
+        DCCP_RESET_CODE_TOO_BUSY,
+        DCCP_RESET_CODE_BAD_INIT_COOKIE,
+        DCCP_RESET_CODE_AGGRESSION_PENALTY,
+};
+/* DCCP options */
+enum {
+        DCCPO_PADDING = 0,
+        DCCPO_MANDATORY = 1,
+        DCCPO_MIN_RESERVED = 3,
+        DCCPO_MAX_RESERVED = 31,
+        DCCPO_NDP_COUNT = 37,
+        DCCPO_ACK_VECTOR_0 = 38,
+        DCCPO_ACK_VECTOR_1 = 39,
+        DCCPO_TIMESTAMP = 41,
+        DCCPO_TIMESTAMP_ECHO = 42,
+        DCCPO_ELAPSED_TIME = 43,
+        DCCPO_MAX = 45,
+        DCCPO_MIN_CCID_SPECIFIC = 128,
+        DCCPO_MAX_CCID_SPECIFIC = 255,
+};
+/* DCCP features */
+enum {
+        DCCPF_RESERVED = 0,
+        DCCPF_SEQUENCE_WINDOW = 3,
+        DCCPF_SEND_ACK_VECTOR = 6,
+        DCCPF_SEND_NDP_COUNT = 7,
+        /* 10-127 reserved */
+        DCCPF_MIN_CCID_SPECIFIC = 128,
+        DCCPF_MAX_CCID_SPECIFIC = 255,
+};
+/* initial values for each feature */
+#define DCCPF_INITIAL_SEQUENCE_WINDOW           100
+/* FIXME: for now we're using CCID 3 (TFRC) */
+#define DCCPF_INITIAL_CCID                      3
+#define DCCPF_INITIAL_SEND_ACK_VECTOR           0
+/* FIXME: for now we're default to 1 but it should really be 0 */
+#define DCCPF_INITIAL_SEND_NDP_COUNT            1
+#define DCCP_NDP_LIMIT 0xFFFFFF
+/**
+  * struct dccp_options - option values for a DCCP connection
+  *     @dccpo_sequence_window - Sequence Window Feature (section 7.5.2)
+  *     @dccpo_ccid - Congestion Control Id (CCID) (section 10)
+  *     @dccpo_send_ack_vector - Send Ack Vector Feature (section 11.5)
+  *     @dccpo_send_ndp_count - Send NDP Count Feature (7.7.2)
+  */
+struct dccp_options {
+        __u64   dccpo_sequence_window;
+        __u8    dccpo_ccid;
+        __u8    dccpo_send_ack_vector;
+        __u8    dccpo_send_ndp_count;
+};
+extern void __dccp_options_init(struct dccp_options *dccpo);
+extern void dccp_options_init(struct dccp_options *dccpo);
+extern int dccp_parse_options(struct sock *sk, struct sk_buff *skb);
+struct dccp_request_sock {
+        struct inet_request_sock dreq_inet_rsk;
+        __u64                    dreq_iss;
+        __u64                    dreq_isr;
+        __u32                    dreq_service;
+};
+static inline struct dccp_request_sock *dccp_rsk(const struct request_sock *req)
+{
+        return (struct dccp_request_sock *)req;
+}
+/* Read about the ECN nonce to see why it is 253 */
+#define DCCP_MAX_ACK_VECTOR_LEN 253
+struct dccp_options_received {
+        u32     dccpor_ndp:24,
+                dccpor_ack_vector_len:8;
+        u32     dccpor_ack_vector_idx:10;
+        /* 22 bits hole, try to pack */
+        u32     dccpor_timestamp;
+        u32     dccpor_timestamp_echo;
+        u32     dccpor_elapsed_time;
+};
+struct ccid;
+enum dccp_role {
+        DCCP_ROLE_UNDEFINED,
+        DCCP_ROLE_LISTEN,
+        DCCP_ROLE_CLIENT,
+        DCCP_ROLE_SERVER,
+};
+/**
+ * struct dccp_sock - DCCP socket state
+ *
+ * @dccps_swl - sequence number window low
+ * @dccps_swh - sequence number window high
+ * @dccps_awl - acknowledgement number window low
+ * @dccps_awh - acknowledgement number window high
+ * @dccps_iss - initial sequence number sent
+ * @dccps_isr - initial sequence number received
+ * @dccps_osr - first OPEN sequence number received
+ * @dccps_gss - greatest sequence number sent
+ * @dccps_gsr - greatest valid sequence number received
+ * @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss
+ * @dccps_timestamp_time - time of latest TIMESTAMP option
+ * @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option
+ * @dccps_ext_header_len - network protocol overhead (IP/IPv6 options)
+ * @dccps_pmtu_cookie - Last pmtu seen by socket
+ * @dccps_avg_packet_size - FIXME: has to be set by the app thru some setsockopt or ioctl, CCID3 uses it
+ * @dccps_role - Role of this sock, one of %dccp_role
+ * @dccps_ndp_count - number of Non Data Packets since last data packet
+ * @dccps_hc_rx_ackpkts - receiver half connection acked packets
+ */
+struct dccp_sock {
+        /* inet_connection_sock has to be the first member of dccp_sock */
+        struct inet_connection_sock     dccps_inet_connection;
+        __u64                           dccps_swl;
+        __u64                           dccps_swh;
+        __u64                           dccps_awl;
+        __u64                           dccps_awh;
+        __u64                           dccps_iss;
+        __u64                           dccps_isr;
+        __u64                           dccps_osr;
+        __u64                           dccps_gss;
+        __u64                           dccps_gsr;
+        __u64                           dccps_gar;
+        unsigned long                   dccps_service;
+        unsigned long                   dccps_timestamp_time;
+        __u32                           dccps_timestamp_echo;
+        __u32                           dccps_avg_packet_size;
+        unsigned long                   dccps_ndp_count;
+        __u16                           dccps_ext_header_len;
+        __u32                           dccps_pmtu_cookie;
+        __u32                           dccps_mss_cache;
+        struct dccp_options             dccps_options;
+        struct dccp_ackpkts             *dccps_hc_rx_ackpkts;
+        void                            *dccps_hc_rx_ccid_private;
+        void                            *dccps_hc_tx_ccid_private;
+        struct ccid                     *dccps_hc_rx_ccid;
+        struct ccid                     *dccps_hc_tx_ccid;
+        struct dccp_options_received    dccps_options_received;
+        enum dccp_role                  dccps_role:2;
+};
+ 
+static inline struct dccp_sock *dccp_sk(const struct sock *sk)
+{
+        return (struct dccp_sock *)sk;
+}
+static inline const char *dccp_role(const struct sock *sk)
+{
+        switch (dccp_sk(sk)->dccps_role) {
+        case DCCP_ROLE_UNDEFINED: return "undefined";
+        case DCCP_ROLE_LISTEN:    return "listen";
+        case DCCP_ROLE_SERVER:    return "server";
+        case DCCP_ROLE_CLIENT:    return "client";
+        }
+        return NULL;
+}
+#endif /* _LINUX_DCCP_H */

diff --git a/include/linux/dccp.h b/include/linux/dccp.h new file mode 100644 index 000000000000..e3b4bf7346bb --- /dev/null +++ b/include/linux/dccp.h
@@ -0,0 +1,432 @@
	1	#ifndef _LINUX_DCCP_H
	2	#define _LINUX_DCCP_H
	3
	4	#include <linux/in.h>
	5	#include <linux/list.h>
	6	#include <linux/types.h>
	7	#include <linux/uio.h>
	8	#include <linux/workqueue.h>
	9
	10	#include <net/inet_connection_sock.h>
	11	#include <net/sock.h>
	12	#include <net/tcp_states.h>
	13	#include <net/tcp.h>
	14
	15	/* FIXME: this is utterly wrong */
	16	struct sockaddr_dccp {
	17	struct sockaddr_in in;
	18	unsigned int service;
	19	};
	20
	21	enum dccp_state {
	22	DCCP_OPEN = TCP_ESTABLISHED,
	23	DCCP_REQUESTING = TCP_SYN_SENT,
	24	DCCP_PARTOPEN = TCP_FIN_WAIT1, /* FIXME:
	25	This mapping is horrible, but TCP has
	26	no matching state for DCCP_PARTOPEN,
	27	as TCP_SYN_RECV is already used by
	28	DCCP_RESPOND, why don't stop using TCP
	29	mapping of states? OK, now we don't use
	30	sk_stream_sendmsg anymore, so doesn't
	31	seem to exist any reason for us to
	32	do the TCP mapping here */
	33	DCCP_LISTEN = TCP_LISTEN,
	34	DCCP_RESPOND = TCP_SYN_RECV,
	35	DCCP_CLOSING = TCP_CLOSING,
	36	DCCP_TIME_WAIT = TCP_TIME_WAIT,
	37	DCCP_CLOSED = TCP_CLOSE,
	38	DCCP_MAX_STATES = TCP_MAX_STATES,
	39	};
	40
	41	#define DCCP_STATE_MASK 0xf
	42	#define DCCP_ACTION_FIN (1<<7)
	43
	44	enum {
	45	DCCPF_OPEN = TCPF_ESTABLISHED,
	46	DCCPF_REQUESTING = TCPF_SYN_SENT,
	47	DCCPF_PARTOPEN = TCPF_FIN_WAIT1,
	48	DCCPF_LISTEN = TCPF_LISTEN,
	49	DCCPF_RESPOND = TCPF_SYN_RECV,
	50	DCCPF_CLOSING = TCPF_CLOSING,
	51	DCCPF_TIME_WAIT = TCPF_TIME_WAIT,
	52	DCCPF_CLOSED = TCPF_CLOSE,
	53	};
	54
	55	/**
	56	* struct dccp_hdr - generic part of DCCP packet header
	57	*
	58	* @dccph_sport - Relevant port on the endpoint that sent this packet
	59	* @dccph_dport - Relevant port on the other endpoint
	60	* @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words
	61	* @dccph_ccval - Used by the HC-Sender CCID
	62	* @dccph_cscov - Parts of the packet that are covered by the Checksum field
	63	* @dccph_checksum - Internet checksum, depends on dccph_cscov
	64	* @dccph_x - 0 = 24 bit sequence number, 1 = 48
	65	* @dccph_type - packet type, see DCCP_PKT_ prefixed macros
	66	* @dccph_seq - sequence number high or low order 24 bits, depends on dccph_x
	67	*/
	68	struct dccp_hdr {
	69	__u16 dccph_sport,
	70	dccph_dport;
	71	__u8 dccph_doff;
	72	#if defined(__LITTLE_ENDIAN_BITFIELD)
	73	__u8 dccph_cscov:4,
	74	dccph_ccval:4;
	75	#elif defined(__BIG_ENDIAN_BITFIELD)
	76	__u8 dccph_ccval:4,
	77	dccph_cscov:4;
	78	#else
	79	#error "Adjust your <asm/byteorder.h> defines"
	80	#endif
	81	__u16 dccph_checksum;
	82	#if defined(__LITTLE_ENDIAN_BITFIELD)
	83	__u32 dccph_x:1,
	84	dccph_type:4,
	85	dccph_reserved:3,
	86	dccph_seq:24;
	87	#elif defined(__BIG_ENDIAN_BITFIELD)
	88	__u32 dccph_reserved:3,
	89	dccph_type:4,
	90	dccph_x:1,
	91	dccph_seq:24;
	92	#else
	93	#error "Adjust your <asm/byteorder.h> defines"
	94	#endif
	95	};
	96
	97	static inline struct dccp_hdr dccp_hdr(const struct sk_buff skb)
	98	{
	99	return (struct dccp_hdr *)skb->h.raw;
	100	}
	101
	102	/**
	103	* struct dccp_hdr_ext - the low bits of a 48 bit seq packet
	104	*
	105	* @dccph_seq_low - low 24 bits of a 48 bit seq packet
	106	*/
	107	struct dccp_hdr_ext {
	108	__u32 dccph_seq_low;
	109	};
	110
	111	static inline struct dccp_hdr_ext dccp_hdrx(const struct sk_buff skb)
	112	{
	113	return (struct dccp_hdr_ext *)(skb->h.raw + sizeof(struct dccp_hdr));
	114	}
	115
	116	static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb)
	117	{
	118	const struct dccp_hdr *dh = dccp_hdr(skb);
	119	return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0);
	120	}
	121
	122	static inline __u64 dccp_hdr_seq(const struct sk_buff *skb)
	123	{
	124	const struct dccp_hdr *dh = dccp_hdr(skb);
	125	#if defined(__LITTLE_ENDIAN_BITFIELD)
	126	__u64 seq_nr = ntohl(dh->dccph_seq << 8);
	127	#elif defined(__BIG_ENDIAN_BITFIELD)
	128	__u64 seq_nr = ntohl(dh->dccph_seq);
	129	#else
	130	#error "Adjust your <asm/byteorder.h> defines"
	131	#endif
	132
	133	if (dh->dccph_x != 0)
	134	seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(skb)->dccph_seq_low);
	135
	136	return seq_nr;
	137	}
	138
	139	/**
	140	* struct dccp_hdr_request - Conection initiation request header
	141	*
	142	* @dccph_req_service - Service to which the client app wants to connect
	143	* @dccph_req_options - list of options (must be a multiple of 32 bits
	144	*/
	145	struct dccp_hdr_request {
	146	__u32 dccph_req_service;
	147	};
	148
	149	static inline struct dccp_hdr_request dccp_hdr_request(struct sk_buff skb)
	150	{
	151	return (struct dccp_hdr_request *)(skb->h.raw + dccp_basic_hdr_len(skb));
	152	}
	153
	154	/**
	155	* struct dccp_hdr_ack_bits - acknowledgment bits common to most packets
	156	*
	157	* @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR
	158	* @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR
	159	*/
	160	struct dccp_hdr_ack_bits {
	161	__u32 dccph_reserved1:8,
	162	dccph_ack_nr_high:24;
	163	__u32 dccph_ack_nr_low;
	164	};
	165
	166	static inline struct dccp_hdr_ack_bits dccp_hdr_ack_bits(const struct sk_buff skb)
	167	{
	168	return (struct dccp_hdr_ack_bits *)(skb->h.raw + dccp_basic_hdr_len(skb));
	169	}
	170
	171	static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb)
	172	{
	173	const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb);
	174	#if defined(__LITTLE_ENDIAN_BITFIELD)
	175	return (((u64)ntohl(dhack->dccph_ack_nr_high << 8)) << 32) + ntohl(dhack->dccph_ack_nr_low);
	176	#elif defined(__BIG_ENDIAN_BITFIELD)
	177	return (((u64)ntohl(dhack->dccph_ack_nr_high)) << 32) + ntohl(dhack->dccph_ack_nr_low);
	178	#else
	179	#error "Adjust your <asm/byteorder.h> defines"
	180	#endif
	181	}
	182
	183	/**
	184	* struct dccp_hdr_response - Conection initiation response header
	185	*
	186	* @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR
	187	* @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR
	188	* @dccph_resp_service - Echoes the Service Code on a received DCCP-Request
	189	* @dccph_resp_options - list of options (must be a multiple of 32 bits
	190	*/
	191	struct dccp_hdr_response {
	192	struct dccp_hdr_ack_bits dccph_resp_ack;
	193	__u32 dccph_resp_service;
	194	};
	195
	196	static inline struct dccp_hdr_response dccp_hdr_response(struct sk_buff skb)
	197	{
	198	return (struct dccp_hdr_response *)(skb->h.raw + dccp_basic_hdr_len(skb));
	199	}
	200
	201	/**
	202	* struct dccp_hdr_reset - Unconditionally shut down a connection
	203	*
	204	* @dccph_reset_service - Echoes the Service Code on a received DCCP-Request
	205	* @dccph_reset_options - list of options (must be a multiple of 32 bits
	206	*/
	207	struct dccp_hdr_reset {
	208	struct dccp_hdr_ack_bits dccph_reset_ack;
	209	__u8 dccph_reset_code,
	210	dccph_reset_data[3];
	211	};
	212
	213	static inline struct dccp_hdr_reset dccp_hdr_reset(struct sk_buff skb)
	214	{
	215	return (struct dccp_hdr_reset *)(skb->h.raw + dccp_basic_hdr_len(skb));
	216	}
	217
	218	enum dccp_pkt_type {
	219	DCCP_PKT_REQUEST = 0,
	220	DCCP_PKT_RESPONSE,
	221	DCCP_PKT_DATA,
	222	DCCP_PKT_ACK,
	223	DCCP_PKT_DATAACK,
	224	DCCP_PKT_CLOSEREQ,
	225	DCCP_PKT_CLOSE,
	226	DCCP_PKT_RESET,
	227	DCCP_PKT_SYNC,
	228	DCCP_PKT_SYNCACK,
	229	DCCP_PKT_INVALID,
	230	};
	231
	232	#define DCCP_NR_PKT_TYPES DCCP_PKT_INVALID
	233
	234	static inline unsigned int dccp_packet_hdr_len(const __u8 type)
	235	{
	236	if (type == DCCP_PKT_DATA)
	237	return 0;
	238	if (type == DCCP_PKT_DATAACK \|\|
	239	type == DCCP_PKT_ACK \|\|
	240	type == DCCP_PKT_SYNC \|\|
	241	type == DCCP_PKT_SYNCACK \|\|
	242	type == DCCP_PKT_CLOSE \|\|
	243	type == DCCP_PKT_CLOSEREQ)
	244	return sizeof(struct dccp_hdr_ack_bits);
	245	if (type == DCCP_PKT_REQUEST)
	246	return sizeof(struct dccp_hdr_request);
	247	if (type == DCCP_PKT_RESPONSE)
	248	return sizeof(struct dccp_hdr_response);
	249	return sizeof(struct dccp_hdr_reset);
	250	}
	251
	252	static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
	253	{
	254	return dccp_basic_hdr_len(skb) +
	255	dccp_packet_hdr_len(dccp_hdr(skb)->dccph_type);
	256	}
	257
	258	enum dccp_reset_codes {
	259	DCCP_RESET_CODE_UNSPECIFIED = 0,
	260	DCCP_RESET_CODE_CLOSED,
	261	DCCP_RESET_CODE_ABORTED,
	262	DCCP_RESET_CODE_NO_CONNECTION,
	263	DCCP_RESET_CODE_PACKET_ERROR,
	264	DCCP_RESET_CODE_OPTION_ERROR,
	265	DCCP_RESET_CODE_MANDATORY_ERROR,
	266	DCCP_RESET_CODE_CONNECTION_REFUSED,
	267	DCCP_RESET_CODE_BAD_SERVICE_CODE,
	268	DCCP_RESET_CODE_TOO_BUSY,
	269	DCCP_RESET_CODE_BAD_INIT_COOKIE,
	270	DCCP_RESET_CODE_AGGRESSION_PENALTY,
	271	};
	272
	273	/* DCCP options */
	274	enum {
	275	DCCPO_PADDING = 0,
	276	DCCPO_MANDATORY = 1,
	277	DCCPO_MIN_RESERVED = 3,
	278	DCCPO_MAX_RESERVED = 31,
	279	DCCPO_NDP_COUNT = 37,
	280	DCCPO_ACK_VECTOR_0 = 38,
	281	DCCPO_ACK_VECTOR_1 = 39,
	282	DCCPO_TIMESTAMP = 41,
	283	DCCPO_TIMESTAMP_ECHO = 42,
	284	DCCPO_ELAPSED_TIME = 43,
	285	DCCPO_MAX = 45,
	286	DCCPO_MIN_CCID_SPECIFIC = 128,
	287	DCCPO_MAX_CCID_SPECIFIC = 255,
	288	};
	289
	290	/* DCCP features */
	291	enum {
	292	DCCPF_RESERVED = 0,
	293	DCCPF_SEQUENCE_WINDOW = 3,
	294	DCCPF_SEND_ACK_VECTOR = 6,
	295	DCCPF_SEND_NDP_COUNT = 7,
	296	/* 10-127 reserved */
	297	DCCPF_MIN_CCID_SPECIFIC = 128,
	298	DCCPF_MAX_CCID_SPECIFIC = 255,
	299	};
	300
	301	/* initial values for each feature */
	302	#define DCCPF_INITIAL_SEQUENCE_WINDOW 100
	303	/* FIXME: for now we're using CCID 3 (TFRC) */
	304	#define DCCPF_INITIAL_CCID 3
	305	#define DCCPF_INITIAL_SEND_ACK_VECTOR 0
	306	/* FIXME: for now we're default to 1 but it should really be 0 */
	307	#define DCCPF_INITIAL_SEND_NDP_COUNT 1
	308
	309	#define DCCP_NDP_LIMIT 0xFFFFFF
	310
	311	/**
	312	* struct dccp_options - option values for a DCCP connection
	313	* @dccpo_sequence_window - Sequence Window Feature (section 7.5.2)
	314	* @dccpo_ccid - Congestion Control Id (CCID) (section 10)
	315	* @dccpo_send_ack_vector - Send Ack Vector Feature (section 11.5)
	316	* @dccpo_send_ndp_count - Send NDP Count Feature (7.7.2)
	317	*/
	318	struct dccp_options {
	319	__u64 dccpo_sequence_window;
	320	__u8 dccpo_ccid;
	321	__u8 dccpo_send_ack_vector;
	322	__u8 dccpo_send_ndp_count;
	323	};
	324
	325	extern void __dccp_options_init(struct dccp_options *dccpo);
	326	extern void dccp_options_init(struct dccp_options *dccpo);
	327	extern int dccp_parse_options(struct sock sk, struct sk_buff skb);
	328
	329	struct dccp_request_sock {
	330	struct inet_request_sock dreq_inet_rsk;
	331	__u64 dreq_iss;
	332	__u64 dreq_isr;
	333	__u32 dreq_service;
	334	};
	335
	336	static inline struct dccp_request_sock dccp_rsk(const struct request_sock req)
	337	{
	338	return (struct dccp_request_sock *)req;
	339	}
	340
	341	/* Read about the ECN nonce to see why it is 253 */
	342	#define DCCP_MAX_ACK_VECTOR_LEN 253
	343
	344	struct dccp_options_received {
	345	u32 dccpor_ndp:24,
	346	dccpor_ack_vector_len:8;
	347	u32 dccpor_ack_vector_idx:10;
	348	/* 22 bits hole, try to pack */
	349	u32 dccpor_timestamp;
	350	u32 dccpor_timestamp_echo;
	351	u32 dccpor_elapsed_time;
	352	};
	353
	354	struct ccid;
	355
	356	enum dccp_role {
	357	DCCP_ROLE_UNDEFINED,
	358	DCCP_ROLE_LISTEN,
	359	DCCP_ROLE_CLIENT,
	360	DCCP_ROLE_SERVER,
	361	};
	362
	363	/**
	364	* struct dccp_sock - DCCP socket state
	365	*
	366	* @dccps_swl - sequence number window low
	367	* @dccps_swh - sequence number window high
	368	* @dccps_awl - acknowledgement number window low
	369	* @dccps_awh - acknowledgement number window high
	370	* @dccps_iss - initial sequence number sent
	371	* @dccps_isr - initial sequence number received
	372	* @dccps_osr - first OPEN sequence number received
	373	* @dccps_gss - greatest sequence number sent
	374	* @dccps_gsr - greatest valid sequence number received
	375	* @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss
	376	* @dccps_timestamp_time - time of latest TIMESTAMP option
	377	* @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option
	378	* @dccps_ext_header_len - network protocol overhead (IP/IPv6 options)
	379	* @dccps_pmtu_cookie - Last pmtu seen by socket
	380	* @dccps_avg_packet_size - FIXME: has to be set by the app thru some setsockopt or ioctl, CCID3 uses it
	381	* @dccps_role - Role of this sock, one of %dccp_role
	382	* @dccps_ndp_count - number of Non Data Packets since last data packet
	383	* @dccps_hc_rx_ackpkts - receiver half connection acked packets
	384	*/
	385	struct dccp_sock {
	386	/* inet_connection_sock has to be the first member of dccp_sock */
	387	struct inet_connection_sock dccps_inet_connection;
	388	__u64 dccps_swl;
	389	__u64 dccps_swh;
	390	__u64 dccps_awl;
	391	__u64 dccps_awh;
	392	__u64 dccps_iss;
	393	__u64 dccps_isr;
	394	__u64 dccps_osr;
	395	__u64 dccps_gss;
	396	__u64 dccps_gsr;
	397	__u64 dccps_gar;
	398	unsigned long dccps_service;
	399	unsigned long dccps_timestamp_time;
	400	__u32 dccps_timestamp_echo;
	401	__u32 dccps_avg_packet_size;
	402	unsigned long dccps_ndp_count;
	403	__u16 dccps_ext_header_len;
	404	__u32 dccps_pmtu_cookie;
	405	__u32 dccps_mss_cache;
	406	struct dccp_options dccps_options;
	407	struct dccp_ackpkts *dccps_hc_rx_ackpkts;
	408	void *dccps_hc_rx_ccid_private;
	409	void *dccps_hc_tx_ccid_private;
	410	struct ccid *dccps_hc_rx_ccid;
	411	struct ccid *dccps_hc_tx_ccid;
	412	struct dccp_options_received dccps_options_received;
	413	enum dccp_role dccps_role:2;
	414	};
	415
	416	static inline struct dccp_sock dccp_sk(const struct sock sk)
	417	{
	418	return (struct dccp_sock *)sk;
	419	}
	420
	421	static inline const char dccp_role(const struct sock sk)
	422	{
	423	switch (dccp_sk(sk)->dccps_role) {
	424	case DCCP_ROLE_UNDEFINED: return "undefined";
	425	case DCCP_ROLE_LISTEN: return "listen";
	426	case DCCP_ROLE_SERVER: return "server";
	427	case DCCP_ROLE_CLIENT: return "client";
	428	}
	429	return NULL;
	430	}
	431
	432	#endif /* _LINUX_DCCP_H */