/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright (c) 2021 Red Hat GmbH
* Author: Stefano Brivio <sbrivio@redhat.com>
*/
#ifndef TCP_H
#define TCP_H
#define TCP_TIMER_INTERVAL 1000 /* ms */
#define TCP_CONN_INDEX_BITS 17 /* 128k - 1 */
#define TCP_MAX_CONNS MAX_FROM_BITS(TCP_CONN_INDEX_BITS)
struct ctx;
void tcp_timer_handler(struct ctx *c, union epoll_ref ref);
void tcp_listen_handler(struct ctx *c, union epoll_ref ref,
const struct timespec *now);
void tcp_sock_handler(struct ctx *c, union epoll_ref ref, uint32_t events);
int tcp_tap_handler(struct ctx *c, int af, const void *saddr, const void *daddr,
const struct pool *p, int idx, const struct timespec *now);
int tcp_sock_init(const struct ctx *c, sa_family_t af, const void *addr,
const char *ifname, in_port_t port);
int tcp_init(struct ctx *c);
void tcp_timer(struct ctx *c, const struct timespec *ts);
void tcp_defer_handler(struct ctx *c);
void tcp_sock_set_bufsize(const struct ctx *c, int s);
void tcp_update_l2_buf(const unsigned char *eth_d, const unsigned char *eth_s);
/**
* union tcp_epoll_ref - epoll reference portion for TCP connections
* @index: Index of connection in table
* @u32: Opaque u32 value of reference
*/
union tcp_epoll_ref {
uint32_t index:20;
uint32_t u32;
};
/**
* union tcp_listen_epoll_ref - epoll reference portion for TCP listening
* @port: Port number we're forwarding *to* (listening port plus delta)
* @pif: pif in which the socket is listening
* @u32: Opaque u32 value of reference
*/
union tcp_listen_epoll_ref {
struct {
in_port_t port;
uint8_t pif;
};
uint32_t u32;
};
/**
* struct tcp_ctx - Execution context for TCP routines
* @hash_secret: 128-bit secret for hash functions, ISN and hash table
* @conn_count: Count of total connections in connection table
* @port_to_tap: Ports bound host-side, packets to tap or spliced
* @fwd_in: Port forwarding configuration for inbound packets
* @fwd_out: Port forwarding configuration for outbound packets
* @timer_run: Timestamp of most recent timer run
* @kernel_snd_wnd: Kernel reports sending window (with commit 8f7baad7f035)
* @pipe_size: Size of pipes for spliced connections
*/
struct tcp_ctx {
uint64_t hash_secret[2];
int conn_count;
struct port_fwd fwd_in;
struct port_fwd fwd_out;
struct timespec timer_run;
#ifdef HAS_SND_WND
int kernel_snd_wnd;
#endif
size_t pipe_size;
};
#endif /* TCP_H */
