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https://passt.top/passt
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ca2749e1bd
In practical terms, passt doesn't benefit from the additional protection offered by the AGPL over the GPL, because it's not suitable to be executed over a computer network. Further, restricting the distribution under the version 3 of the GPL wouldn't provide any practical advantage either, as long as the passt codebase is concerned, and might cause unnecessary compatibility dilemmas. Change licensing terms to the GNU General Public License Version 2, or any later version, with written permission from all current and past contributors, namely: myself, David Gibson, Laine Stump, Andrea Bolognani, Paul Holzinger, Richard W.M. Jones, Chris Kuhn, Florian Weimer, Giuseppe Scrivano, Stefan Hajnoczi, and Vasiliy Ulyanov. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
74 lines
2.3 KiB
C
74 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-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 - 1 */
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#define TCP_MAX_CONNS MAX_FROM_BITS(TCP_CONN_INDEX_BITS)
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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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int tcp_sock_init(const struct ctx *c, sa_family_t af, const void *addr,
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const char *ifname, 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 struct in_addr *ip_da);
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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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* @outbound: Listening socket maps to outbound, spliced connection
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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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outbound: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 total connections 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_in: Port forwarding configuration for inbound packets
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* @fwd_out: Port forwarding configuration 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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struct port_fwd fwd_in;
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struct port_fwd fwd_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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