diff options
Diffstat (limited to 'include/net/inet_connection_sock.h')
| -rw-r--r-- | include/net/inet_connection_sock.h | 342 |
1 files changed, 342 insertions, 0 deletions
diff --git a/include/net/inet_connection_sock.h b/include/net/inet_connection_sock.h new file mode 100644 index 000000000..ff901aade --- /dev/null +++ b/include/net/inet_connection_sock.h @@ -0,0 +1,342 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * NET Generic infrastructure for INET connection oriented protocols. + * + * Definitions for inet_connection_sock + * + * Authors: Many people, see the TCP sources + * + * From code originally in TCP + */ +#ifndef _INET_CONNECTION_SOCK_H +#define _INET_CONNECTION_SOCK_H + +#include <linux/compiler.h> +#include <linux/string.h> +#include <linux/timer.h> +#include <linux/poll.h> +#include <linux/kernel.h> +#include <linux/sockptr.h> + +#include <net/inet_sock.h> +#include <net/request_sock.h> + +/* Cancel timers, when they are not required. */ +#undef INET_CSK_CLEAR_TIMERS + +struct inet_bind_bucket; +struct tcp_congestion_ops; + +/* + * Pointers to address related TCP functions + * (i.e. things that depend on the address family) + */ +struct inet_connection_sock_af_ops { + int (*queue_xmit)(struct sock *sk, struct sk_buff *skb, struct flowi *fl); + void (*send_check)(struct sock *sk, struct sk_buff *skb); + int (*rebuild_header)(struct sock *sk); + void (*sk_rx_dst_set)(struct sock *sk, const struct sk_buff *skb); + int (*conn_request)(struct sock *sk, struct sk_buff *skb); + struct sock *(*syn_recv_sock)(const struct sock *sk, struct sk_buff *skb, + struct request_sock *req, + struct dst_entry *dst, + struct request_sock *req_unhash, + bool *own_req); + u16 net_header_len; + u16 net_frag_header_len; + u16 sockaddr_len; + int (*setsockopt)(struct sock *sk, int level, int optname, + sockptr_t optval, unsigned int optlen); + int (*getsockopt)(struct sock *sk, int level, int optname, + char __user *optval, int __user *optlen); + void (*addr2sockaddr)(struct sock *sk, struct sockaddr *); + void (*mtu_reduced)(struct sock *sk); +}; + +/** inet_connection_sock - INET connection oriented sock + * + * @icsk_accept_queue: FIFO of established children + * @icsk_bind_hash: Bind node + * @icsk_timeout: Timeout + * @icsk_retransmit_timer: Resend (no ack) + * @icsk_rto: Retransmit timeout + * @icsk_pmtu_cookie Last pmtu seen by socket + * @icsk_ca_ops Pluggable congestion control hook + * @icsk_af_ops Operations which are AF_INET{4,6} specific + * @icsk_ulp_ops Pluggable ULP control hook + * @icsk_ulp_data ULP private data + * @icsk_clean_acked Clean acked data hook + * @icsk_listen_portaddr_node hash to the portaddr listener hashtable + * @icsk_ca_state: Congestion control state + * @icsk_retransmits: Number of unrecovered [RTO] timeouts + * @icsk_pending: Scheduled timer event + * @icsk_backoff: Backoff + * @icsk_syn_retries: Number of allowed SYN (or equivalent) retries + * @icsk_probes_out: unanswered 0 window probes + * @icsk_ext_hdr_len: Network protocol overhead (IP/IPv6 options) + * @icsk_ack: Delayed ACK control data + * @icsk_mtup; MTU probing control data + * @icsk_probes_tstamp: Probe timestamp (cleared by non-zero window ack) + * @icsk_user_timeout: TCP_USER_TIMEOUT value + */ +struct inet_connection_sock { + /* inet_sock has to be the first member! */ + struct inet_sock icsk_inet; + struct request_sock_queue icsk_accept_queue; + struct inet_bind_bucket *icsk_bind_hash; + unsigned long icsk_timeout; + struct timer_list icsk_retransmit_timer; + struct timer_list icsk_delack_timer; + __u32 icsk_rto; + __u32 icsk_rto_min; + __u32 icsk_delack_max; + __u32 icsk_pmtu_cookie; + const struct tcp_congestion_ops *icsk_ca_ops; + const struct inet_connection_sock_af_ops *icsk_af_ops; + const struct tcp_ulp_ops *icsk_ulp_ops; + void __rcu *icsk_ulp_data; + void (*icsk_clean_acked)(struct sock *sk, u32 acked_seq); + struct hlist_node icsk_listen_portaddr_node; + unsigned int (*icsk_sync_mss)(struct sock *sk, u32 pmtu); + __u8 icsk_ca_state:5, + icsk_ca_initialized:1, + icsk_ca_setsockopt:1, + icsk_ca_dst_locked:1; + __u8 icsk_retransmits; + __u8 icsk_pending; + __u8 icsk_backoff; + __u8 icsk_syn_retries; + __u8 icsk_probes_out; + __u16 icsk_ext_hdr_len; + struct { + __u8 pending; /* ACK is pending */ + __u8 quick; /* Scheduled number of quick acks */ + __u8 pingpong; /* The session is interactive */ + __u8 retry; /* Number of attempts */ + __u32 ato; /* Predicted tick of soft clock */ + unsigned long timeout; /* Currently scheduled timeout */ + __u32 lrcvtime; /* timestamp of last received data packet */ + __u16 last_seg_size; /* Size of last incoming segment */ + __u16 rcv_mss; /* MSS used for delayed ACK decisions */ + } icsk_ack; + struct { + int enabled; + + /* Range of MTUs to search */ + int search_high; + int search_low; + + /* Information on the current probe. */ + int probe_size; + + u32 probe_timestamp; + } icsk_mtup; + u32 icsk_probes_tstamp; + u32 icsk_user_timeout; + + u64 icsk_ca_priv[104 / sizeof(u64)]; +#define ICSK_CA_PRIV_SIZE (13 * sizeof(u64)) +}; + +#define ICSK_TIME_RETRANS 1 /* Retransmit timer */ +#define ICSK_TIME_DACK 2 /* Delayed ack timer */ +#define ICSK_TIME_PROBE0 3 /* Zero window probe timer */ +#define ICSK_TIME_EARLY_RETRANS 4 /* Early retransmit timer */ +#define ICSK_TIME_LOSS_PROBE 5 /* Tail loss probe timer */ +#define ICSK_TIME_REO_TIMEOUT 6 /* Reordering timer */ + +static inline struct inet_connection_sock *inet_csk(const struct sock *sk) +{ + return (struct inet_connection_sock *)sk; +} + +static inline void *inet_csk_ca(const struct sock *sk) +{ + return (void *)inet_csk(sk)->icsk_ca_priv; +} + +struct sock *inet_csk_clone_lock(const struct sock *sk, + const struct request_sock *req, + const gfp_t priority); + +enum inet_csk_ack_state_t { + ICSK_ACK_SCHED = 1, + ICSK_ACK_TIMER = 2, + ICSK_ACK_PUSHED = 4, + ICSK_ACK_PUSHED2 = 8, + ICSK_ACK_NOW = 16 /* Send the next ACK immediately (once) */ +}; + +void inet_csk_init_xmit_timers(struct sock *sk, + void (*retransmit_handler)(struct timer_list *), + void (*delack_handler)(struct timer_list *), + void (*keepalive_handler)(struct timer_list *)); +void inet_csk_clear_xmit_timers(struct sock *sk); + +static inline void inet_csk_schedule_ack(struct sock *sk) +{ + inet_csk(sk)->icsk_ack.pending |= ICSK_ACK_SCHED; +} + +static inline int inet_csk_ack_scheduled(const struct sock *sk) +{ + return inet_csk(sk)->icsk_ack.pending & ICSK_ACK_SCHED; +} + +static inline void inet_csk_delack_init(struct sock *sk) +{ + memset(&inet_csk(sk)->icsk_ack, 0, sizeof(inet_csk(sk)->icsk_ack)); +} + +void inet_csk_delete_keepalive_timer(struct sock *sk); +void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long timeout); + +static inline void inet_csk_clear_xmit_timer(struct sock *sk, const int what) +{ + struct inet_connection_sock *icsk = inet_csk(sk); + + if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0) { + icsk->icsk_pending = 0; +#ifdef INET_CSK_CLEAR_TIMERS + sk_stop_timer(sk, &icsk->icsk_retransmit_timer); +#endif + } else if (what == ICSK_TIME_DACK) { + icsk->icsk_ack.pending = 0; + icsk->icsk_ack.retry = 0; +#ifdef INET_CSK_CLEAR_TIMERS + sk_stop_timer(sk, &icsk->icsk_delack_timer); +#endif + } else { + pr_debug("inet_csk BUG: unknown timer value\n"); + } +} + +/* + * Reset the retransmission timer + */ +static inline void inet_csk_reset_xmit_timer(struct sock *sk, const int what, + unsigned long when, + const unsigned long max_when) +{ + struct inet_connection_sock *icsk = inet_csk(sk); + + if (when > max_when) { + pr_debug("reset_xmit_timer: sk=%p %d when=0x%lx, caller=%p\n", + sk, what, when, (void *)_THIS_IP_); + when = max_when; + } + + if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0 || + what == ICSK_TIME_EARLY_RETRANS || what == ICSK_TIME_LOSS_PROBE || + what == ICSK_TIME_REO_TIMEOUT) { + icsk->icsk_pending = what; + icsk->icsk_timeout = jiffies + when; + sk_reset_timer(sk, &icsk->icsk_retransmit_timer, icsk->icsk_timeout); + } else if (what == ICSK_TIME_DACK) { + icsk->icsk_ack.pending |= ICSK_ACK_TIMER; + icsk->icsk_ack.timeout = jiffies + when; + sk_reset_timer(sk, &icsk->icsk_delack_timer, icsk->icsk_ack.timeout); + } else { + pr_debug("inet_csk BUG: unknown timer value\n"); + } +} + +static inline unsigned long +inet_csk_rto_backoff(const struct inet_connection_sock *icsk, + unsigned long max_when) +{ + u64 when = (u64)icsk->icsk_rto << icsk->icsk_backoff; + + return (unsigned long)min_t(u64, when, max_when); +} + +struct sock *inet_csk_accept(struct sock *sk, int flags, int *err, bool kern); + +int inet_csk_get_port(struct sock *sk, unsigned short snum); + +struct dst_entry *inet_csk_route_req(const struct sock *sk, struct flowi4 *fl4, + const struct request_sock *req); +struct dst_entry *inet_csk_route_child_sock(const struct sock *sk, + struct sock *newsk, + const struct request_sock *req); + +struct sock *inet_csk_reqsk_queue_add(struct sock *sk, + struct request_sock *req, + struct sock *child); +void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req, + unsigned long timeout); +struct sock *inet_csk_complete_hashdance(struct sock *sk, struct sock *child, + struct request_sock *req, + bool own_req); + +static inline void inet_csk_reqsk_queue_added(struct sock *sk) +{ + reqsk_queue_added(&inet_csk(sk)->icsk_accept_queue); +} + +static inline int inet_csk_reqsk_queue_len(const struct sock *sk) +{ + return reqsk_queue_len(&inet_csk(sk)->icsk_accept_queue); +} + +static inline int inet_csk_reqsk_queue_is_full(const struct sock *sk) +{ + return inet_csk_reqsk_queue_len(sk) >= sk->sk_max_ack_backlog; +} + +bool inet_csk_reqsk_queue_drop(struct sock *sk, struct request_sock *req); +void inet_csk_reqsk_queue_drop_and_put(struct sock *sk, struct request_sock *req); + +static inline void inet_csk_prepare_for_destroy_sock(struct sock *sk) +{ + /* The below has to be done to allow calling inet_csk_destroy_sock */ + sock_set_flag(sk, SOCK_DEAD); + this_cpu_inc(*sk->sk_prot->orphan_count); +} + +void inet_csk_destroy_sock(struct sock *sk); +void inet_csk_prepare_forced_close(struct sock *sk); + +/* + * LISTEN is a special case for poll.. + */ +static inline __poll_t inet_csk_listen_poll(const struct sock *sk) +{ + return !reqsk_queue_empty(&inet_csk(sk)->icsk_accept_queue) ? + (EPOLLIN | EPOLLRDNORM) : 0; +} + +int inet_csk_listen_start(struct sock *sk, int backlog); +void inet_csk_listen_stop(struct sock *sk); + +void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr); + +/* update the fast reuse flag when adding a socket */ +void inet_csk_update_fastreuse(struct inet_bind_bucket *tb, + struct sock *sk); + +struct dst_entry *inet_csk_update_pmtu(struct sock *sk, u32 mtu); + +#define TCP_PINGPONG_THRESH 1 + +static inline void inet_csk_enter_pingpong_mode(struct sock *sk) +{ + inet_csk(sk)->icsk_ack.pingpong = TCP_PINGPONG_THRESH; +} + +static inline void inet_csk_exit_pingpong_mode(struct sock *sk) +{ + inet_csk(sk)->icsk_ack.pingpong = 0; +} + +static inline bool inet_csk_in_pingpong_mode(struct sock *sk) +{ + return inet_csk(sk)->icsk_ack.pingpong >= TCP_PINGPONG_THRESH; +} + +static inline bool inet_csk_has_ulp(struct sock *sk) +{ + return inet_sk(sk)->is_icsk && !!inet_csk(sk)->icsk_ulp_ops; +} + +#endif /* _INET_CONNECTION_SOCK_H */ |