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enum conf_port_type is local to conf.c and is used to track the port forwarding mode during configuration. We don't keep it around in the context structure, however the 'init_detect_ports' and 'ns_detect_ports' fields in the context are based solely on this. Rather than changing encoding, just include the forwarding mode into the context structure. Move the type definition to a new port_fwd.h, which is kind of trivial at the moment but will have more stuff later. While we're there, "conf_port_type" doesn't really convey that this enum is describing how port forwarding is configured. Rename it to port_fwd_mode. The variables (now fields) of this type also have mildly confusing names since it's not immediately obvious whether 'ns' and 'init' refer to the source or destination of the packets. Use "in" (host to guest / init to ns) and "out" (guest to host / ns to init) instead. This has the added bonus that we no longer have locals 'udp_init' and 'tcp_init' which shadow global functions. In addition, add a typedef 'port_fwd_map' for a bitmap of each port number, which is used in several places. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
84 lines
2.7 KiB
C
84 lines
2.7 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 TCP_TIMER_INTERVAL 1000 /* ms */
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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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const struct timespec *now);
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int tcp_tap_handler(struct ctx *c, int af, const void *addr,
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const struct pool *p, const struct timespec *now);
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void tcp_sock_init(const struct ctx *c, int ns, sa_family_t af,
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const void *addr, in_port_t port);
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int tcp_init(struct ctx *c);
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void tcp_timer(struct ctx *c, const struct timespec *ts);
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void tcp_defer_handler(struct ctx *c);
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void tcp_sock_set_bufsize(const struct ctx *c, int s);
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void tcp_update_l2_buf(const unsigned char *eth_d, const 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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* @fwd_mode_in: Port forwarding mode for inbound packets
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* @port_to_init: Ports bound namespace-side, spliced to init
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* @fwd_mode_out: Port forwarding mode for outbound packets
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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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*/
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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 [PORT_BITMAP_SIZE];
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enum port_fwd_mode fwd_mode_in;
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uint8_t port_to_init [PORT_BITMAP_SIZE];
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enum port_fwd_mode fwd_mode_out;
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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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};
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#endif /* TCP_H */
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