477 lines
13 KiB
C
477 lines
13 KiB
C
#ifndef _LINUX_DCCP_H
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#define _LINUX_DCCP_H
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#include <linux/types.h>
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#include <asm/byteorder.h>
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/**
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* struct dccp_hdr - generic part of DCCP packet header
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*
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* @dccph_sport - Relevant port on the endpoint that sent this packet
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* @dccph_dport - Relevant port on the other endpoint
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* @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words
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* @dccph_ccval - Used by the HC-Sender CCID
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* @dccph_cscov - Parts of the packet that are covered by the Checksum field
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* @dccph_checksum - Internet checksum, depends on dccph_cscov
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* @dccph_x - 0 = 24 bit sequence number, 1 = 48
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* @dccph_type - packet type, see DCCP_PKT_ prefixed macros
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* @dccph_seq - sequence number high or low order 24 bits, depends on dccph_x
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*/
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struct dccp_hdr {
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__u16 dccph_sport,
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dccph_dport;
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__u8 dccph_doff;
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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__u8 dccph_cscov:4,
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dccph_ccval:4;
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#elif defined(__BIG_ENDIAN_BITFIELD)
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__u8 dccph_ccval:4,
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dccph_cscov:4;
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#else
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#error "Adjust your <asm/byteorder.h> defines"
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#endif
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__u16 dccph_checksum;
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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__u32 dccph_x:1,
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dccph_type:4,
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dccph_reserved:3,
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dccph_seq:24;
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#elif defined(__BIG_ENDIAN_BITFIELD)
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__u32 dccph_reserved:3,
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dccph_type:4,
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dccph_x:1,
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dccph_seq:24;
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#else
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#error "Adjust your <asm/byteorder.h> defines"
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#endif
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};
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/**
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* struct dccp_hdr_ext - the low bits of a 48 bit seq packet
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*
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* @dccph_seq_low - low 24 bits of a 48 bit seq packet
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*/
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struct dccp_hdr_ext {
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__u32 dccph_seq_low;
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};
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/**
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* struct dccp_hdr_request - Conection initiation request header
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*
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* @dccph_req_service - Service to which the client app wants to connect
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* @dccph_req_options - list of options (must be a multiple of 32 bits
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*/
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struct dccp_hdr_request {
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__u32 dccph_req_service;
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};
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/**
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* struct dccp_hdr_ack_bits - acknowledgment bits common to most packets
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*
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* @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR
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* @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR
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*/
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struct dccp_hdr_ack_bits {
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__u32 dccph_reserved1:8,
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dccph_ack_nr_high:24;
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__u32 dccph_ack_nr_low;
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};
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/**
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* struct dccp_hdr_response - Conection initiation response header
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*
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* @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR
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* @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR
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* @dccph_resp_service - Echoes the Service Code on a received DCCP-Request
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* @dccph_resp_options - list of options (must be a multiple of 32 bits
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*/
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struct dccp_hdr_response {
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struct dccp_hdr_ack_bits dccph_resp_ack;
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__u32 dccph_resp_service;
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};
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/**
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* struct dccp_hdr_reset - Unconditionally shut down a connection
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*
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* @dccph_reset_service - Echoes the Service Code on a received DCCP-Request
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* @dccph_reset_options - list of options (must be a multiple of 32 bits
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*/
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struct dccp_hdr_reset {
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struct dccp_hdr_ack_bits dccph_reset_ack;
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__u8 dccph_reset_code,
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dccph_reset_data[3];
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};
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enum dccp_pkt_type {
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DCCP_PKT_REQUEST = 0,
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DCCP_PKT_RESPONSE,
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DCCP_PKT_DATA,
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DCCP_PKT_ACK,
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DCCP_PKT_DATAACK,
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DCCP_PKT_CLOSEREQ,
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DCCP_PKT_CLOSE,
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DCCP_PKT_RESET,
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DCCP_PKT_SYNC,
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DCCP_PKT_SYNCACK,
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DCCP_PKT_INVALID,
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};
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#define DCCP_NR_PKT_TYPES DCCP_PKT_INVALID
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static inline unsigned int dccp_packet_hdr_len(const __u8 type)
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{
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if (type == DCCP_PKT_DATA)
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return 0;
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if (type == DCCP_PKT_DATAACK ||
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type == DCCP_PKT_ACK ||
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type == DCCP_PKT_SYNC ||
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type == DCCP_PKT_SYNCACK ||
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type == DCCP_PKT_CLOSE ||
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type == DCCP_PKT_CLOSEREQ)
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return sizeof(struct dccp_hdr_ack_bits);
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if (type == DCCP_PKT_REQUEST)
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return sizeof(struct dccp_hdr_request);
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if (type == DCCP_PKT_RESPONSE)
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return sizeof(struct dccp_hdr_response);
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return sizeof(struct dccp_hdr_reset);
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}
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enum dccp_reset_codes {
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DCCP_RESET_CODE_UNSPECIFIED = 0,
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DCCP_RESET_CODE_CLOSED,
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DCCP_RESET_CODE_ABORTED,
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DCCP_RESET_CODE_NO_CONNECTION,
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DCCP_RESET_CODE_PACKET_ERROR,
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DCCP_RESET_CODE_OPTION_ERROR,
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DCCP_RESET_CODE_MANDATORY_ERROR,
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DCCP_RESET_CODE_CONNECTION_REFUSED,
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DCCP_RESET_CODE_BAD_SERVICE_CODE,
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DCCP_RESET_CODE_TOO_BUSY,
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DCCP_RESET_CODE_BAD_INIT_COOKIE,
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DCCP_RESET_CODE_AGGRESSION_PENALTY,
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};
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/* DCCP options */
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enum {
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DCCPO_PADDING = 0,
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DCCPO_MANDATORY = 1,
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DCCPO_MIN_RESERVED = 3,
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DCCPO_MAX_RESERVED = 31,
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DCCPO_NDP_COUNT = 37,
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DCCPO_ACK_VECTOR_0 = 38,
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DCCPO_ACK_VECTOR_1 = 39,
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DCCPO_TIMESTAMP = 41,
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DCCPO_TIMESTAMP_ECHO = 42,
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DCCPO_ELAPSED_TIME = 43,
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DCCPO_MAX = 45,
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DCCPO_MIN_CCID_SPECIFIC = 128,
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DCCPO_MAX_CCID_SPECIFIC = 255,
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};
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/* DCCP features */
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enum {
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DCCPF_RESERVED = 0,
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DCCPF_SEQUENCE_WINDOW = 3,
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DCCPF_SEND_ACK_VECTOR = 6,
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DCCPF_SEND_NDP_COUNT = 7,
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/* 10-127 reserved */
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DCCPF_MIN_CCID_SPECIFIC = 128,
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DCCPF_MAX_CCID_SPECIFIC = 255,
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};
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/* DCCP socket options */
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#define DCCP_SOCKOPT_PACKET_SIZE 1
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#define DCCP_SOCKOPT_SERVICE 2
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#define DCCP_SOCKOPT_CCID_RX_INFO 128
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#define DCCP_SOCKOPT_CCID_TX_INFO 192
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#define DCCP_SERVICE_LIST_MAX_LEN 32
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#ifdef __KERNEL__
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#include <linux/in.h>
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#include <linux/list.h>
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#include <linux/uio.h>
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#include <linux/workqueue.h>
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#include <net/inet_connection_sock.h>
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#include <net/inet_timewait_sock.h>
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#include <net/sock.h>
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#include <net/tcp_states.h>
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#include <net/tcp.h>
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enum dccp_state {
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DCCP_OPEN = TCP_ESTABLISHED,
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DCCP_REQUESTING = TCP_SYN_SENT,
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DCCP_PARTOPEN = TCP_FIN_WAIT1, /* FIXME:
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This mapping is horrible, but TCP has
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no matching state for DCCP_PARTOPEN,
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as TCP_SYN_RECV is already used by
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DCCP_RESPOND, why don't stop using TCP
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mapping of states? OK, now we don't use
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sk_stream_sendmsg anymore, so doesn't
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seem to exist any reason for us to
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do the TCP mapping here */
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DCCP_LISTEN = TCP_LISTEN,
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DCCP_RESPOND = TCP_SYN_RECV,
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DCCP_CLOSING = TCP_CLOSING,
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DCCP_TIME_WAIT = TCP_TIME_WAIT,
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DCCP_CLOSED = TCP_CLOSE,
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DCCP_MAX_STATES = TCP_MAX_STATES,
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};
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#define DCCP_STATE_MASK 0xf
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#define DCCP_ACTION_FIN (1<<7)
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enum {
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DCCPF_OPEN = TCPF_ESTABLISHED,
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DCCPF_REQUESTING = TCPF_SYN_SENT,
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DCCPF_PARTOPEN = TCPF_FIN_WAIT1,
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DCCPF_LISTEN = TCPF_LISTEN,
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DCCPF_RESPOND = TCPF_SYN_RECV,
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DCCPF_CLOSING = TCPF_CLOSING,
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DCCPF_TIME_WAIT = TCPF_TIME_WAIT,
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DCCPF_CLOSED = TCPF_CLOSE,
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};
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static inline struct dccp_hdr *dccp_hdr(const struct sk_buff *skb)
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{
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return (struct dccp_hdr *)skb->h.raw;
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}
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static inline struct dccp_hdr_ext *dccp_hdrx(const struct sk_buff *skb)
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{
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return (struct dccp_hdr_ext *)(skb->h.raw + sizeof(struct dccp_hdr));
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}
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static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh)
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{
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return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0);
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}
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static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb)
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{
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const struct dccp_hdr *dh = dccp_hdr(skb);
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return __dccp_basic_hdr_len(dh);
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}
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static inline __u64 dccp_hdr_seq(const struct sk_buff *skb)
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{
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const struct dccp_hdr *dh = dccp_hdr(skb);
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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__u64 seq_nr = ntohl(dh->dccph_seq << 8);
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#elif defined(__BIG_ENDIAN_BITFIELD)
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__u64 seq_nr = ntohl(dh->dccph_seq);
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#else
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#error "Adjust your <asm/byteorder.h> defines"
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#endif
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if (dh->dccph_x != 0)
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seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(skb)->dccph_seq_low);
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return seq_nr;
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}
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static inline struct dccp_hdr_request *dccp_hdr_request(struct sk_buff *skb)
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{
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return (struct dccp_hdr_request *)(skb->h.raw + dccp_basic_hdr_len(skb));
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}
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static inline struct dccp_hdr_ack_bits *dccp_hdr_ack_bits(const struct sk_buff *skb)
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{
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return (struct dccp_hdr_ack_bits *)(skb->h.raw + dccp_basic_hdr_len(skb));
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}
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static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb)
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{
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const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb);
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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return (((u64)ntohl(dhack->dccph_ack_nr_high << 8)) << 32) + ntohl(dhack->dccph_ack_nr_low);
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#elif defined(__BIG_ENDIAN_BITFIELD)
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return (((u64)ntohl(dhack->dccph_ack_nr_high)) << 32) + ntohl(dhack->dccph_ack_nr_low);
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#else
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#error "Adjust your <asm/byteorder.h> defines"
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#endif
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}
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static inline struct dccp_hdr_response *dccp_hdr_response(struct sk_buff *skb)
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{
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return (struct dccp_hdr_response *)(skb->h.raw + dccp_basic_hdr_len(skb));
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}
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static inline struct dccp_hdr_reset *dccp_hdr_reset(struct sk_buff *skb)
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{
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return (struct dccp_hdr_reset *)(skb->h.raw + dccp_basic_hdr_len(skb));
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}
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static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh)
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{
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return __dccp_basic_hdr_len(dh) +
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dccp_packet_hdr_len(dh->dccph_type);
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}
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static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
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{
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return __dccp_hdr_len(dccp_hdr(skb));
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}
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/* initial values for each feature */
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#define DCCPF_INITIAL_SEQUENCE_WINDOW 100
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/* FIXME: for now we're using CCID 3 (TFRC) */
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#define DCCPF_INITIAL_CCID 3
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#define DCCPF_INITIAL_SEND_ACK_VECTOR 0
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/* FIXME: for now we're default to 1 but it should really be 0 */
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#define DCCPF_INITIAL_SEND_NDP_COUNT 1
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#define DCCP_NDP_LIMIT 0xFFFFFF
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/**
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* struct dccp_options - option values for a DCCP connection
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* @dccpo_sequence_window - Sequence Window Feature (section 7.5.2)
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* @dccpo_ccid - Congestion Control Id (CCID) (section 10)
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* @dccpo_send_ack_vector - Send Ack Vector Feature (section 11.5)
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* @dccpo_send_ndp_count - Send NDP Count Feature (7.7.2)
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*/
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struct dccp_options {
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__u64 dccpo_sequence_window;
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__u8 dccpo_rx_ccid;
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__u8 dccpo_tx_ccid;
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__u8 dccpo_send_ack_vector;
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__u8 dccpo_send_ndp_count;
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};
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extern void __dccp_options_init(struct dccp_options *dccpo);
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extern void dccp_options_init(struct dccp_options *dccpo);
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extern int dccp_parse_options(struct sock *sk, struct sk_buff *skb);
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struct dccp_request_sock {
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struct inet_request_sock dreq_inet_rsk;
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__u64 dreq_iss;
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__u64 dreq_isr;
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__u32 dreq_service;
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};
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static inline struct dccp_request_sock *dccp_rsk(const struct request_sock *req)
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{
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return (struct dccp_request_sock *)req;
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}
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extern struct inet_timewait_death_row dccp_death_row;
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struct dccp_options_received {
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u32 dccpor_ndp; /* only 24 bits */
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u32 dccpor_timestamp;
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u32 dccpor_timestamp_echo;
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u32 dccpor_elapsed_time;
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};
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struct ccid;
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enum dccp_role {
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DCCP_ROLE_UNDEFINED,
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DCCP_ROLE_LISTEN,
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DCCP_ROLE_CLIENT,
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DCCP_ROLE_SERVER,
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};
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struct dccp_service_list {
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__u32 dccpsl_nr;
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__u32 dccpsl_list[0];
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};
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#define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1)
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static inline int dccp_list_has_service(const struct dccp_service_list *sl,
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const u32 service)
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{
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if (likely(sl != NULL)) {
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u32 i = sl->dccpsl_nr;
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while (i--)
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if (sl->dccpsl_list[i] == service)
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return 1;
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}
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return 0;
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}
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struct dccp_ackvec;
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/**
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* struct dccp_sock - DCCP socket state
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*
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* @dccps_swl - sequence number window low
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* @dccps_swh - sequence number window high
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* @dccps_awl - acknowledgement number window low
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* @dccps_awh - acknowledgement number window high
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* @dccps_iss - initial sequence number sent
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* @dccps_isr - initial sequence number received
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* @dccps_osr - first OPEN sequence number received
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* @dccps_gss - greatest sequence number sent
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* @dccps_gsr - greatest valid sequence number received
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* @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss
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* @dccps_timestamp_time - time of latest TIMESTAMP option
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* @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option
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* @dccps_ext_header_len - network protocol overhead (IP/IPv6 options)
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* @dccps_pmtu_cookie - Last pmtu seen by socket
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* @dccps_packet_size - Set thru setsockopt
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* @dccps_role - Role of this sock, one of %dccp_role
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* @dccps_ndp_count - number of Non Data Packets since last data packet
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* @dccps_hc_rx_ackvec - rx half connection ack vector
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*/
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struct dccp_sock {
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/* inet_connection_sock has to be the first member of dccp_sock */
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struct inet_connection_sock dccps_inet_connection;
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__u64 dccps_swl;
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__u64 dccps_swh;
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__u64 dccps_awl;
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__u64 dccps_awh;
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__u64 dccps_iss;
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__u64 dccps_isr;
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__u64 dccps_osr;
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__u64 dccps_gss;
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__u64 dccps_gsr;
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__u64 dccps_gar;
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__u32 dccps_service;
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struct dccp_service_list *dccps_service_list;
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struct timeval dccps_timestamp_time;
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__u32 dccps_timestamp_echo;
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__u32 dccps_packet_size;
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unsigned long dccps_ndp_count;
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__u16 dccps_ext_header_len;
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__u32 dccps_pmtu_cookie;
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__u32 dccps_mss_cache;
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struct dccp_options dccps_options;
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struct dccp_ackvec *dccps_hc_rx_ackvec;
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void *dccps_hc_rx_ccid_private;
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void *dccps_hc_tx_ccid_private;
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struct ccid *dccps_hc_rx_ccid;
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struct ccid *dccps_hc_tx_ccid;
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struct dccp_options_received dccps_options_received;
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struct timeval dccps_epoch;
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enum dccp_role dccps_role:2;
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__u8 dccps_hc_rx_insert_options:1;
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__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 */
|