54d9df3903
...by: - storing the chained-hash next connection pointer as numeric reference rather than as pointer - storing the MSS as 14-bit value, and rounding it - using only the effective amount of bits needed to store the hash bucket number - explicitly limiting window scaling factors to 4-bit values (maximum factor is 14, from RFC 7323) - scaling SO_SNDBUF values, and using a 8-bit representation for the duplicate ACK sequence - keeping window values unscaled, as received and sent Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
87 lines
2.9 KiB
C
87 lines
2.9 KiB
C
/* SPDX-License-Identifier: AGPL-3.0-or-later
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* Copyright (c) 2021 Red Hat GmbH
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* Author: Stefano Brivio <sbrivio@redhat.com>
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*/
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#ifndef TCP_H
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#define TCP_H
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#define REFILL_INTERVAL 1000 /* ms */
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#define PORT_DETECT_INTERVAL 1000
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#define TCP_TIMER_INTERVAL MIN(REFILL_INTERVAL, PORT_DETECT_INTERVAL)
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#define TCP_CONN_INDEX_BITS 17 /* 128k */
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#define TCP_MAX_CONNS (1 << TCP_CONN_INDEX_BITS)
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#define TCP_MAX_SOCKS (TCP_MAX_CONNS + USHRT_MAX * 2)
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#define TCP_SOCK_POOL_SIZE 32
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struct ctx;
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void tcp_sock_handler(struct ctx *c, union epoll_ref ref, uint32_t events,
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struct timespec *now);
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int tcp_tap_handler(struct ctx *c, int af, void *addr,
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struct tap_l4_msg *msg, int count, struct timespec *now);
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int tcp_sock_init(struct ctx *c, struct timespec *now);
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void tcp_timer(struct ctx *c, struct timespec *now);
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void tcp_defer_handler(struct ctx *c);
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void tcp_sock_set_bufsize(struct ctx *c, int s);
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void tcp_update_l2_buf(unsigned char *eth_d, unsigned char *eth_s,
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const uint32_t *ip_da);
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void tcp_remap_to_tap(in_port_t port, in_port_t delta);
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void tcp_remap_to_init(in_port_t port, in_port_t delta);
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/**
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* union tcp_epoll_ref - epoll reference portion for TCP connections
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* @listen: Set if this file descriptor is a listening socket
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* @splice: Set if descriptor is associated to a spliced connection
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* @v6: Set for IPv6 sockets or connections
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* @timer: Reference is a timerfd descriptor for connection
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* @index: Index of connection in table, or port for bound sockets
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* @u32: Opaque u32 value of reference
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*/
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union tcp_epoll_ref {
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struct {
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uint32_t listen:1,
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splice:1,
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v6:1,
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timer:1,
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index:20;
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} tcp;
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uint32_t u32;
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};
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/**
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* struct tcp_ctx - Execution context for TCP routines
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* @hash_secret: 128-bit secret for hash functions, ISN and hash table
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* @conn_count: Count of connections (not spliced) in connection table
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* @splice_conn_count: Count of spliced connections in connection table
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* @port_to_tap: Ports bound host-side, packets to tap or spliced
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* @init_detect_ports: If set, periodically detect ports bound in init
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* @port_to_init: Ports bound namespace-side, spliced to init
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* @ns_detect_ports: If set, periodically detect ports bound in namespace
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* @timer_run: Timestamp of most recent timer run
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* @kernel_snd_wnd: Kernel reports sending window (with commit 8f7baad7f035)
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* @pipe_size: Size of pipes for spliced connections
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* @refill_ts: Time of last refill operation for pools of sockets/pipes
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* @port_detect_ts: Time of last TCP port detection/rebind, if enabled
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*/
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struct tcp_ctx {
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uint64_t hash_secret[2];
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int conn_count;
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int splice_conn_count;
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uint8_t port_to_tap [USHRT_MAX / 8];
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int init_detect_ports;
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uint8_t port_to_init [USHRT_MAX / 8];
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int ns_detect_ports;
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struct timespec timer_run;
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#ifdef HAS_SND_WND
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int kernel_snd_wnd;
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#endif
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size_t pipe_size;
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struct timespec refill_ts;
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struct timespec port_detect_ts;
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};
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#endif /* TCP_H */
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