dccp.h
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上传日期:2009-04-28
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- #ifndef _LINUX_DCCP_H
- #define _LINUX_DCCP_H
- #include <linux/types.h>
- #include <asm/byteorder.h>
- /**
- * 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
- };
- /**
- * 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;
- };
- /**
- * 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;
- };
- /**
- * 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;
- };
- /**
- * 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;
- };
- /**
- * 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];
- };
- 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);
- }
- 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,
- };
- /* DCCP socket options */
- #define DCCP_SOCKOPT_PACKET_SIZE 1
- #define DCCP_SOCKOPT_SERVICE 2
- #define DCCP_SOCKOPT_CCID_RX_INFO 128
- #define DCCP_SOCKOPT_CCID_TX_INFO 192
- #define DCCP_SERVICE_LIST_MAX_LEN 32
- #ifdef __KERNEL__
- #include <linux/in.h>
- #include <linux/list.h>
- #include <linux/uio.h>
- #include <linux/workqueue.h>
- #include <net/inet_connection_sock.h>
- #include <net/inet_timewait_sock.h>
- #include <net/sock.h>
- #include <net/tcp_states.h>
- #include <net/tcp.h>
- 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,
- };
- static inline struct dccp_hdr *dccp_hdr(const struct sk_buff *skb)
- {
- return (struct dccp_hdr *)skb->h.raw;
- }
- 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 dccp_hdr *dh)
- {
- return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0);
- }
- static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb)
- {
- const struct dccp_hdr *dh = dccp_hdr(skb);
- return __dccp_basic_hdr_len(dh);
- }
- 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;
- }
- 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));
- }
- 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
- }
- 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));
- }
- 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));
- }
- static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh)
- {
- return __dccp_basic_hdr_len(dh) +
- dccp_packet_hdr_len(dh->dccph_type);
- }
- static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
- {
- return __dccp_hdr_len(dccp_hdr(skb));
- }
- /* 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_rx_ccid;
- __u8 dccpo_tx_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;
- }
- extern struct inet_timewait_death_row dccp_death_row;
- struct dccp_options_received {
- u32 dccpor_ndp; /* only 24 bits */
- 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_service_list {
- __u32 dccpsl_nr;
- __u32 dccpsl_list[0];
- };
- #define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1)
- static inline int dccp_list_has_service(const struct dccp_service_list *sl,
- const u32 service)
- {
- if (likely(sl != NULL)) {
- u32 i = sl->dccpsl_nr;
- while (i--)
- if (sl->dccpsl_list[i] == service)
- return 1;
- }
- return 0;
- }
- struct dccp_ackvec;
- /**
- * 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_packet_size - Set thru setsockopt
- * @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_ackvec - rx half connection ack vector
- */
- 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;
- __u32 dccps_service;
- struct dccp_service_list *dccps_service_list;
- struct timeval dccps_timestamp_time;
- __u32 dccps_timestamp_echo;
- __u32 dccps_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_ackvec *dccps_hc_rx_ackvec;
- 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;
- struct timeval dccps_epoch;
- enum dccp_role dccps_role:2;
- __u8 dccps_hc_rx_insert_options:1;
- __u8 dccps_hc_tx_insert_options:1;
- };
-
- static inline struct dccp_sock *dccp_sk(const struct sock *sk)
- {
- return (struct dccp_sock *)sk;
- }
- static inline int dccp_service_not_initialized(const struct sock *sk)
- {
- return dccp_sk(sk)->dccps_service == DCCP_SERVICE_INVALID_VALUE;
- }
- 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 /* __KERNEL__ */
- #endif /* _LINUX_DCCP_H */