| /* 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 { |
| 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_NEW_SYN_RECV = TCP_NEW_SYN_RECV, |
| DCCP_PARTOPEN = TCP_MAX_STATES, |
| DCCP_PASSIVE_CLOSEREQ, /* clients receiving CloseReq */ |
| DCCP_MAX_STATES |
| }; |
| |
| 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_NEW_SYN_RECV = TCPF_NEW_SYN_RECV, |
| 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 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 { |
| struct inet_request_sock dreq_inet_rsk; |
| __u64 dreq_iss; |
| __u64 dreq_gss; |
| __u64 dreq_isr; |
| __u64 dreq_gsr; |
| __be32 dreq_service; |
| spinlock_t dreq_lock; |
| 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[]; |
| }; |
| |
| #define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1) |
| #define DCCP_SERVICE_CODE_IS_ABSENT 0 |
| |
| static inline bool 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 true; |
| } |
| return false; |
| } |
| |
| 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; |
| } |
| |
| extern void dccp_syn_ack_timeout(const struct request_sock *req); |
| |
| #endif /* _LINUX_DCCP_H */ |