#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 { __be16 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 __sum16 dccph_checksum; #if defined(__LITTLE_ENDIAN_BITFIELD) __u8 dccph_x:1, dccph_type:4, dccph_reserved:3; #elif defined(__BIG_ENDIAN_BITFIELD) __u8 dccph_reserved:3, dccph_type:4, dccph_x:1; #else #error "Adjust your <asm/byteorder.h> defines" #endif __u8 dccph_seq2; __be16 dccph_seq; }; /** * 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 { __be32 dccph_seq_low; }; /** * struct dccp_hdr_request - Connection initiation request header * * @dccph_req_service - Service to which the client app wants to connect */ struct dccp_hdr_request { __be32 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 { __be16 dccph_reserved1; __be16 dccph_ack_nr_high; __be32 dccph_ack_nr_low; }; /** * struct dccp_hdr_response - Connection initiation response header * * @dccph_resp_ack - 48 bit Acknowledgment Number Subheader (5.3) * @dccph_resp_service - Echoes the Service Code on a received DCCP-Request */ struct dccp_hdr_response { struct dccp_hdr_ack_bits dccph_resp_ack; __be32 dccph_resp_service; }; /** * struct dccp_hdr_reset - Unconditionally shut down a connection * * @dccph_reset_ack - 48 bit Acknowledgment Number Subheader (5.6) * @dccph_reset_code - one of %dccp_reset_codes * @dccph_reset_data - the Data 1 ... Data 3 fields from 5.6 */ 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_MAX_RESET_CODES /* Leave at the end! */ }; /* DCCP options */ enum { DCCPO_PADDING = 0, DCCPO_MANDATORY = 1, DCCPO_MIN_RESERVED = 3, DCCPO_MAX_RESERVED = 31, DCCPO_CHANGE_L = 32, DCCPO_CONFIRM_L = 33, DCCPO_CHANGE_R = 34, DCCPO_CONFIRM_R = 35, 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_RX_CCID_SPECIFIC = 128, /* from sender to receiver */ DCCPO_MAX_RX_CCID_SPECIFIC = 191, DCCPO_MIN_TX_CCID_SPECIFIC = 192, /* from receiver to sender */ DCCPO_MAX_TX_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 { DCCPC_CCID2 = 2, DCCPC_CCID3 = 3, }; /* DCCP features (RFC 4340 section 6.4) */ enum dccp_feature_numbers { DCCPF_RESERVED = 0, DCCPF_CCID = 1, DCCPF_SHORT_SEQNOS = 2, DCCPF_SEQUENCE_WINDOW = 3, 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, /* 10-127 reserved */ DCCPF_MIN_CCID_SPECIFIC = 128, DCCPF_SEND_LEV_RATE = 192, /* RFC 4342, sec. 8.4 */ DCCPF_MAX_CCID_SPECIFIC = 255, }; /* DCCP socket control message types for cmsg */ enum dccp_cmsg_type { DCCP_SCM_PRIORITY = 1, DCCP_SCM_QPOLICY_MAX = 0xFFFF, /* ^-- Up to here reserved exclusively for qpolicy parameters */ DCCP_SCM_MAX }; /* DCCP priorities for outgoing/queued packets */ enum dccp_packet_dequeueing_policy { DCCPQ_POLICY_SIMPLE, DCCPQ_POLICY_PRIO, DCCPQ_POLICY_MAX }; /* DCCP socket options */ #define DCCP_SOCKOPT_PACKET_SIZE 1 /* XXX deprecated, without effect */ #define DCCP_SOCKOPT_SERVICE 2 #define DCCP_SOCKOPT_CHANGE_L 3 #define DCCP_SOCKOPT_CHANGE_R 4 #define DCCP_SOCKOPT_GET_CUR_MPS 5 #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_QPOLICY_ID 16 #define DCCP_SOCKOPT_QPOLICY_TXQLEN 17 #define DCCP_SOCKOPT_CCID_RX_INFO 128 #define DCCP_SOCKOPT_CCID_TX_INFO 192 /* maximum number of services provided on the same listening port */ #define DCCP_SERVICE_LIST_MAX_LEN 32 #ifdef __KERNEL__ #include <linux/in.h> #include <linux/ktime.h> #include <linux/list.h> #include <linux/uio.h> #include <linux/workqueue.h> #include <net/inet_connection_sock.h> #include <net/inet_sock.h> #include <net/inet_timewait_sock.h> #include <net/tcp_states.h> enum dccp_state { DCCP_OPEN = TCP_ESTABLISHED, DCCP_REQUESTING = TCP_SYN_SENT, DCCP_LISTEN = TCP_LISTEN, DCCP_RESPOND = TCP_SYN_RECV, /* * States involved in closing a DCCP connection: * 1) ACTIVE_CLOSEREQ is entered by a server sending a CloseReq. * * 2) CLOSING can have three different meanings (RFC 4340, 8.3): * a. Client has performed active-close, has sent a Close to the server * from state OPEN or PARTOPEN, and is waiting for the final Reset * (in this case, SOCK_DONE == 1). * b. Client is asked to perform passive-close, by receiving a CloseReq * in (PART)OPEN state. It sends a Close and waits for final Reset * (in this case, SOCK_DONE == 0). * c. Server performs an active-close as in (a), keeps TIMEWAIT state. * * 3) The following intermediate states are employed to give passively * closing nodes a chance to process their unread data: * - PASSIVE_CLOSE (from OPEN => CLOSED) and * - PASSIVE_CLOSEREQ (from (PART)OPEN to CLOSING; case (b) above). */ DCCP_ACTIVE_CLOSEREQ = TCP_FIN_WAIT1, DCCP_PASSIVE_CLOSE = TCP_CLOSE_WAIT, /* any node receiving a Close */ DCCP_CLOSING = TCP_CLOSING, DCCP_TIME_WAIT = TCP_TIME_WAIT, DCCP_CLOSED = TCP_CLOSE, DCCP_PARTOPEN = TCP_MAX_STATES, DCCP_PASSIVE_CLOSEREQ, /* clients receiving CloseReq */ DCCP_MAX_STATES }; #define DCCP_STATE_MASK 0x1f enum { DCCPF_OPEN = TCPF_ESTABLISHED, DCCPF_REQUESTING = TCPF_SYN_SENT, DCCPF_LISTEN = TCPF_LISTEN, DCCPF_RESPOND = TCPF_SYN_RECV, DCCPF_ACTIVE_CLOSEREQ = TCPF_FIN_WAIT1, DCCPF_CLOSING = TCPF_CLOSING, DCCPF_TIME_WAIT = TCPF_TIME_WAIT, DCCPF_CLOSED = TCPF_CLOSE, DCCPF_PARTOPEN = (1 << DCCP_PARTOPEN), }; static inline struct dccp_hdr *dccp_hdr(const struct sk_buff *skb) { return (struct dccp_hdr *)skb_transport_header(skb); } static inline struct dccp_hdr *dccp_zeroed_hdr(struct sk_buff *skb, int headlen) { skb_push(skb, headlen); skb_reset_transport_header(skb); return memset(skb_transport_header(skb), 0, headlen); } static inline struct dccp_hdr_ext *dccp_hdrx(const struct dccp_hdr *dh) { return (struct dccp_hdr_ext *)((unsigned char *)dh + sizeof(*dh)); } 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 dccp_hdr *dh) { __u64 seq_nr = ntohs(dh->dccph_seq); if (dh->dccph_x != 0) seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(dh)->dccph_seq_low); else seq_nr += (u32)dh->dccph_seq2 << 16; return seq_nr; } static inline struct dccp_hdr_request *dccp_hdr_request(struct sk_buff *skb) { return (struct dccp_hdr_request *)(skb_transport_header(skb) + 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_transport_header(skb) + 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); return ((u64)ntohs(dhack->dccph_ack_nr_high) << 32) + ntohl(dhack->dccph_ack_nr_low); } static inline struct dccp_hdr_response *dccp_hdr_response(struct sk_buff *skb) { return (struct dccp_hdr_response *)(skb_transport_header(skb) + dccp_basic_hdr_len(skb)); } static inline struct dccp_hdr_reset *dccp_hdr_reset(struct sk_buff *skb) { return (struct dccp_hdr_reset *)(skb_transport_header(skb) + 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)); } /** * struct dccp_request_sock - represent DCCP-specific connection request * @dreq_inet_rsk: structure inherited from * @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 */ struct dccp_request_sock { struct inet_request_sock dreq_inet_rsk; __u64 dreq_iss; __u64 dreq_isr; __be32 dreq_service; struct list_head dreq_featneg; __u32 dreq_timestamp_echo; __u32 dreq_timestamp_time; }; 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; extern int dccp_parse_options(struct sock *sk, struct dccp_request_sock *dreq, struct sk_buff *skb); struct dccp_options_received { u64 dccpor_ndp:48; 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; __be32 dccpsl_list[0]; }; #define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1) #define DCCP_SERVICE_CODE_IS_ABSENT 0 static inline int dccp_list_has_service(const struct dccp_service_list *sl, const __be32 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_service - first (passive sock) or unique (active sock) service code * @dccps_service_list - second .. last service code on passive socket * @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option * @dccps_timestamp_time - time of receiving latest @dccps_timestamp_echo * @dccps_l_ack_ratio - feature-local Ack Ratio * @dccps_r_ack_ratio - feature-remote Ack Ratio * @dccps_l_seq_win - local Sequence Window (influences ack number validity) * @dccps_r_seq_win - remote Sequence Window (influences seq number validity) * @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_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) * @dccps_options_received - parsed set of retrieved options * @dccps_qpolicy - TX dequeueing policy, one of %dccp_packet_dequeueing_policy * @dccps_tx_qlen - maximum length of the TX queue * @dccps_role - role of this sock, one of %dccp_role * @dccps_hc_rx_insert_options - receiver wants to add options when acking * @dccps_hc_tx_insert_options - sender wants to add options when sending * @dccps_server_timewait - server holds timewait state on close (RFC 4340, 8.3) * @dccps_sync_scheduled - flag which signals "send out-of-band message soon" * @dccps_xmitlet - tasklet scheduled by the TX CCID to dequeue data packets * @dccps_xmit_timer - used by the TX CCID to delay sending (rate-based pacing) * @dccps_syn_rtt - RTT sample from Request/Response exchange (in usecs) */ struct dccp_sock { /* inet_connection_sock has to be the first member of dccp_sock */ struct inet_connection_sock dccps_inet_connection; #define dccps_syn_rtt dccps_inet_connection.icsk_ack.lrcvtime __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; __be32 dccps_service; __u32 dccps_mss_cache; struct dccp_service_list *dccps_service_list; __u32 dccps_timestamp_echo; __u32 dccps_timestamp_time; __u16 dccps_l_ack_ratio; __u16 dccps_r_ack_ratio; __u64 dccps_l_seq_win:48; __u64 dccps_r_seq_win:48; __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 list_head dccps_featneg; struct dccp_ackvec *dccps_hc_rx_ackvec; struct ccid *dccps_hc_rx_ccid; struct ccid *dccps_hc_tx_ccid; struct dccp_options_received dccps_options_received; __u8 dccps_qpolicy; __u32 dccps_tx_qlen; enum dccp_role dccps_role:2; __u8 dccps_hc_rx_insert_options:1; __u8 dccps_hc_tx_insert_options:1; __u8 dccps_server_timewait:1; __u8 dccps_sync_scheduled:1; struct tasklet_struct dccps_xmitlet; struct timer_list dccps_xmit_timer; }; 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 /* __KERNEL__ */ #endif /* _LINUX_DCCP_H */