/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _LINUX_DCCP_H #define _LINUX_DCCP_H #include <linux/in.h> #include <linux/interrupt.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> #include <uapi/linux/dccp.h> enum dccp_state { … }; enum { … }; static inline struct dccp_hdr *dccp_hdr(const struct sk_buff *skb) { … } static inline struct dccp_hdr *dccp_zeroed_hdr(struct sk_buff *skb, int headlen) { … } static inline struct dccp_hdr_ext *dccp_hdrx(const struct dccp_hdr *dh) { … } static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh) { … } static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb) { … } static inline __u64 dccp_hdr_seq(const struct dccp_hdr *dh) { … } static inline struct dccp_hdr_request *dccp_hdr_request(struct sk_buff *skb) { … } static inline struct dccp_hdr_ack_bits *dccp_hdr_ack_bits(const struct sk_buff *skb) { … } static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb) { … } static inline struct dccp_hdr_response *dccp_hdr_response(struct sk_buff *skb) { … } static inline struct dccp_hdr_reset *dccp_hdr_reset(struct sk_buff *skb) { … } static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh) { … } static inline unsigned int dccp_hdr_len(const struct sk_buff *skb) { … } /** * struct dccp_request_sock - represent DCCP-specific connection request * @dreq_inet_rsk: structure inherited from * @dreq_iss: initial sequence number, sent on the first Response (RFC 4340, 7.1) * @dreq_gss: greatest sequence number sent (for retransmitted Responses) * @dreq_isr: initial sequence number received in the first Request * @dreq_gsr: greatest sequence number received (for retransmitted Request(s)) * @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 { … }; static inline struct dccp_request_sock *dccp_rsk(const struct 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 { … }; struct ccid; enum dccp_role { … }; struct dccp_service_list { … }; #define DCCP_SERVICE_INVALID_VALUE … #define DCCP_SERVICE_CODE_IS_ABSENT … static inline bool dccp_list_has_service(const struct dccp_service_list *sl, const __be32 service) { … } 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 { … }; #define dccp_sk(ptr) … static inline const char *dccp_role(const struct sock *sk) { … } extern void dccp_syn_ack_timeout(const struct request_sock *req); #endif /* _LINUX_DCCP_H */
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