[DCCP]: Initial implementation
Development to this point was done on a subversion repository at:
http://oops.ghostprotocols.net:81/cgi-bin/viewcvs.cgi/dccp-2.6/
This repository will be kept at this site for the foreseable future,
so that interested parties can see the history of this code,
attributions, etc.
If I ever decide to take this offline I'll provide the full history at
some other suitable place.
Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/dccp.h b/include/linux/dccp.h
new file mode 100644
index 0000000..e3b4bf7
--- /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 */