91dbc8d21a
The conditional compilation support is now centralized in tcp_fastopen.h and tcp_var.h. This doesn't provide the minimum theoretical code/data footprint when TCP_RFC7413 is disabled, but nearly all the TFO code should wind up being removed by the optimizer, the additional footprint in the syncache entries is a single pointer, and the additional overhead in the tcpcb is at the end of the structure. This enables the TCP_RFC7413 kernel option by default in amd64 and arm64 GENERIC. Reviewed by: hiren MFC after: 1 month Sponsored by: Limelight Networks Differential Revision: https://reviews.freebsd.org/D14048
109 lines
3.7 KiB
C
109 lines
3.7 KiB
C
/*-
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* Copyright (c) 2015-2017 Patrick Kelsey
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _TCP_FASTOPEN_H_
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#define _TCP_FASTOPEN_H_
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#ifdef _KERNEL
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#include "opt_inet.h"
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#define TCP_FASTOPEN_COOKIE_LEN 8 /* SipHash24 64-bit output */
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#ifdef TCP_RFC7413
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VNET_DECLARE(unsigned int, tcp_fastopen_client_enable);
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#define V_tcp_fastopen_client_enable VNET(tcp_fastopen_client_enable)
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VNET_DECLARE(unsigned int, tcp_fastopen_server_enable);
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#define V_tcp_fastopen_server_enable VNET(tcp_fastopen_server_enable)
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#else
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#define V_tcp_fastopen_client_enable 0
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#define V_tcp_fastopen_server_enable 0
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#endif /* TCP_RFC7413 */
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union tcp_fastopen_ip_addr {
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struct in_addr v4;
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struct in6_addr v6;
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};
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struct tcp_fastopen_ccache_entry {
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TAILQ_ENTRY(tcp_fastopen_ccache_entry) cce_link;
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union tcp_fastopen_ip_addr cce_client_ip; /* network byte order */
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union tcp_fastopen_ip_addr cce_server_ip; /* network byte order */
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uint16_t server_port; /* network byte order */
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uint16_t server_mss; /* host byte order */
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uint8_t af;
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uint8_t cookie_len;
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uint8_t cookie[TCP_FASTOPEN_MAX_COOKIE_LEN];
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sbintime_t disable_time; /* non-zero value means path is disabled */
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};
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struct tcp_fastopen_ccache;
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struct tcp_fastopen_ccache_bucket {
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struct mtx ccb_mtx;
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TAILQ_HEAD(bucket_entries, tcp_fastopen_ccache_entry) ccb_entries;
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int ccb_num_entries;
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struct tcp_fastopen_ccache *ccb_ccache;
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};
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struct tcp_fastopen_ccache {
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uma_zone_t zone;
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struct tcp_fastopen_ccache_bucket *base;
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unsigned int bucket_limit;
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unsigned int buckets;
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unsigned int mask;
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uint32_t secret;
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};
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#ifdef TCP_RFC7413
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void tcp_fastopen_init(void);
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void tcp_fastopen_destroy(void);
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unsigned int *tcp_fastopen_alloc_counter(void);
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void tcp_fastopen_decrement_counter(unsigned int *);
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int tcp_fastopen_check_cookie(struct in_conninfo *, uint8_t *, unsigned int,
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uint64_t *);
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void tcp_fastopen_connect(struct tcpcb *);
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void tcp_fastopen_disable_path(struct tcpcb *);
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void tcp_fastopen_update_cache(struct tcpcb *, uint16_t, uint8_t,
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uint8_t *);
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#else
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#define tcp_fastopen_init() ((void)0)
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#define tcp_fastopen_destroy() ((void)0)
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#define tcp_fastopen_alloc_counter() NULL
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#define tcp_fastopen_decrement_counter(c) ((void)0)
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#define tcp_fastopen_check_cookie(i, c, l, lc) (-1)
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#define tcp_fastopen_connect(t) ((void)0)
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#define tcp_fastopen_disable_path(t) ((void)0)
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#define tcp_fastopen_update_cache(t, m, l, c) ((void)0)
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#endif /* TCP_RFC7413 */
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#endif /* _KERNEL */
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#endif /* _TCP_FASTOPEN_H_ */
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