diff options
Diffstat (limited to 'include/linux/dccp.h')
| -rw-r--r-- | include/linux/dccp.h | 324 |
1 files changed, 324 insertions, 0 deletions
diff --git a/include/linux/dccp.h b/include/linux/dccp.h new file mode 100644 index 000000000..325af6119 --- /dev/null +++ b/include/linux/dccp.h @@ -0,0 +1,324 @@ +/* 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; +}; + +#define dccp_sk(ptr) container_of_const(ptr, struct dccp_sock, \ + dccps_inet_connection.icsk_inet.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 */ |