/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_DCCP_H
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#define _LINUX_DCCP_H
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#include <linux/in.h>
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#include <linux/interrupt.h>
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#include <linux/ktime.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_sock.h>
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#include <net/inet_timewait_sock.h>
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#include <net/tcp_states.h>
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#include <uapi/linux/dccp.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_LISTEN = TCP_LISTEN,
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DCCP_RESPOND = TCP_SYN_RECV,
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/*
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* States involved in closing a DCCP connection:
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* 1) ACTIVE_CLOSEREQ is entered by a server sending a CloseReq.
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*
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* 2) CLOSING can have three different meanings (RFC 4340, 8.3):
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* a. Client has performed active-close, has sent a Close to the server
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* from state OPEN or PARTOPEN, and is waiting for the final Reset
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* (in this case, SOCK_DONE == 1).
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* b. Client is asked to perform passive-close, by receiving a CloseReq
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* in (PART)OPEN state. It sends a Close and waits for final Reset
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* (in this case, SOCK_DONE == 0).
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* c. Server performs an active-close as in (a), keeps TIMEWAIT state.
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*
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* 3) The following intermediate states are employed to give passively
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* closing nodes a chance to process their unread data:
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* - PASSIVE_CLOSE (from OPEN => CLOSED) and
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* - PASSIVE_CLOSEREQ (from (PART)OPEN to CLOSING; case (b) above).
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*/
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DCCP_ACTIVE_CLOSEREQ = TCP_FIN_WAIT1,
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DCCP_PASSIVE_CLOSE = TCP_CLOSE_WAIT, /* any node receiving a Close */
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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_NEW_SYN_RECV = TCP_NEW_SYN_RECV,
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DCCP_PARTOPEN = TCP_MAX_STATES,
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DCCP_PASSIVE_CLOSEREQ, /* clients receiving CloseReq */
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DCCP_MAX_STATES
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};
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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_LISTEN = TCPF_LISTEN,
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DCCPF_RESPOND = TCPF_SYN_RECV,
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DCCPF_ACTIVE_CLOSEREQ = TCPF_FIN_WAIT1,
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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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DCCPF_NEW_SYN_RECV = TCPF_NEW_SYN_RECV,
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DCCPF_PARTOPEN = (1 << DCCP_PARTOPEN),
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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_transport_header(skb);
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}
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static inline struct dccp_hdr *dccp_zeroed_hdr(struct sk_buff *skb, int headlen)
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{
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skb_push(skb, headlen);
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skb_reset_transport_header(skb);
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return memset(skb_transport_header(skb), 0, headlen);
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}
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static inline struct dccp_hdr_ext *dccp_hdrx(const struct dccp_hdr *dh)
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{
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return (struct dccp_hdr_ext *)((unsigned char *)dh + sizeof(*dh));
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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 dccp_hdr *dh)
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{
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__u64 seq_nr = ntohs(dh->dccph_seq);
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if (dh->dccph_x != 0)
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seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(dh)->dccph_seq_low);
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else
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seq_nr += (u32)dh->dccph_seq2 << 16;
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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_transport_header(skb) +
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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_transport_header(skb) +
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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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return ((u64)ntohs(dhack->dccph_ack_nr_high) << 32) + ntohl(dhack->dccph_ack_nr_low);
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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_transport_header(skb) +
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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_transport_header(skb) +
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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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/**
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* struct dccp_request_sock - represent DCCP-specific connection request
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* @dreq_inet_rsk: structure inherited from
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* @dreq_iss: initial sequence number, sent on the first Response (RFC 4340, 7.1)
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* @dreq_gss: greatest sequence number sent (for retransmitted Responses)
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* @dreq_isr: initial sequence number received in the first Request
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* @dreq_gsr: greatest sequence number received (for retransmitted Request(s))
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* @dreq_service: service code present on the Request (there is just one)
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* @dreq_featneg: feature negotiation options for this connection
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* The following two fields are analogous to the ones in dccp_sock:
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* @dreq_timestamp_echo: last received timestamp to echo (13.1)
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* @dreq_timestamp_echo: the time of receiving the last @dreq_timestamp_echo
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*/
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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_gss;
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__u64 dreq_isr;
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__u64 dreq_gsr;
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__be32 dreq_service;
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spinlock_t dreq_lock;
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struct list_head dreq_featneg;
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__u32 dreq_timestamp_echo;
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__u32 dreq_timestamp_time;
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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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extern int dccp_parse_options(struct sock *sk, struct dccp_request_sock *dreq,
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struct sk_buff *skb);
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struct dccp_options_received {
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u64 dccpor_ndp:48;
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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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__be32 dccpsl_list[];
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};
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#define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1)
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#define DCCP_SERVICE_CODE_IS_ABSENT 0
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static inline bool dccp_list_has_service(const struct dccp_service_list *sl,
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const __be32 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 true;
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}
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return false;
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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_service - first (passive sock) or unique (active sock) service code
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* @dccps_service_list - second .. last service code on passive socket
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* @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option
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* @dccps_timestamp_time - time of receiving latest @dccps_timestamp_echo
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* @dccps_l_ack_ratio - feature-local Ack Ratio
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* @dccps_r_ack_ratio - feature-remote Ack Ratio
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* @dccps_l_seq_win - local Sequence Window (influences ack number validity)
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* @dccps_r_seq_win - remote Sequence Window (influences seq number validity)
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* @dccps_pcslen - sender partial checksum coverage (via sockopt)
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* @dccps_pcrlen - receiver partial checksum coverage (via sockopt)
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* @dccps_send_ndp_count - local Send NDP Count feature (7.7.2)
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* @dccps_ndp_count - number of Non Data Packets since last data packet
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* @dccps_mss_cache - current value of MSS (path MTU minus header sizes)
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* @dccps_rate_last - timestamp for rate-limiting DCCP-Sync (RFC 4340, 7.5.4)
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* @dccps_featneg - tracks feature-negotiation state (mostly during handshake)
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* @dccps_hc_rx_ackvec - rx half connection ack vector
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* @dccps_hc_rx_ccid - CCID used for the receiver (or receiving half-connection)
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* @dccps_hc_tx_ccid - CCID used for the sender (or sending half-connection)
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* @dccps_options_received - parsed set of retrieved options
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* @dccps_qpolicy - TX dequeueing policy, one of %dccp_packet_dequeueing_policy
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* @dccps_tx_qlen - maximum length of the TX queue
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* @dccps_role - role of this sock, one of %dccp_role
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* @dccps_hc_rx_insert_options - receiver wants to add options when acking
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* @dccps_hc_tx_insert_options - sender wants to add options when sending
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* @dccps_server_timewait - server holds timewait state on close (RFC 4340, 8.3)
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* @dccps_sync_scheduled - flag which signals "send out-of-band message soon"
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* @dccps_xmitlet - tasklet scheduled by the TX CCID to dequeue data packets
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* @dccps_xmit_timer - used by the TX CCID to delay sending (rate-based pacing)
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* @dccps_syn_rtt - RTT sample from Request/Response exchange (in usecs)
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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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#define dccps_syn_rtt dccps_inet_connection.icsk_ack.lrcvtime
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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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__be32 dccps_service;
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__u32 dccps_mss_cache;
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struct dccp_service_list *dccps_service_list;
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__u32 dccps_timestamp_echo;
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__u32 dccps_timestamp_time;
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__u16 dccps_l_ack_ratio;
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__u16 dccps_r_ack_ratio;
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__u64 dccps_l_seq_win:48;
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__u64 dccps_r_seq_win:48;
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__u8 dccps_pcslen:4;
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__u8 dccps_pcrlen:4;
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__u8 dccps_send_ndp_count:1;
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__u64 dccps_ndp_count:48;
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unsigned long dccps_rate_last;
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struct list_head dccps_featneg;
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struct dccp_ackvec *dccps_hc_rx_ackvec;
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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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__u8 dccps_qpolicy;
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__u32 dccps_tx_qlen;
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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;
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__u8 dccps_server_timewait:1;
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__u8 dccps_sync_scheduled:1;
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struct tasklet_struct dccps_xmitlet;
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struct timer_list dccps_xmit_timer;
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};
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static inline struct dccp_sock *dccp_sk(const struct sock *sk)
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{
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return (struct dccp_sock *)sk;
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}
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static inline const char *dccp_role(const struct sock *sk)
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{
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switch (dccp_sk(sk)->dccps_role) {
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case DCCP_ROLE_UNDEFINED: return "undefined";
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case DCCP_ROLE_LISTEN: return "listen";
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case DCCP_ROLE_SERVER: return "server";
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case DCCP_ROLE_CLIENT: return "client";
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}
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return NULL;
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}
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extern void dccp_syn_ack_timeout(const struct request_sock *req);
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#endif /* _LINUX_DCCP_H */
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