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- /*-
- * SPDX-License-Identifier: BSD-3-Clause
- *
- * Copyright (c) 1982, 1986, 1993, 1994, 1995
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * @(#)tcp_var.h 8.4 (Berkeley) 5/24/95
- * $FreeBSD$
- */
- #ifndef _NETINET_TCP_SYNCACHE_H_
- #define _NETINET_TCP_SYNCACHE_H_
- #ifdef _KERNEL
- void syncache_init(void);
- #ifdef VIMAGE
- void syncache_destroy(void);
- #endif
- void syncache_unreach(struct in_conninfo *, tcp_seq);
- int syncache_expand(struct in_conninfo *, struct tcpopt *,
- struct tcphdr *, struct socket **, struct mbuf *);
- int syncache_add(struct in_conninfo *, struct tcpopt *,
- struct tcphdr *, struct inpcb *, struct socket **, struct mbuf *,
- void *, void *, uint8_t);
- void syncache_chkrst(struct in_conninfo *, struct tcphdr *, struct mbuf *);
- void syncache_badack(struct in_conninfo *);
- int syncache_pcblist(struct sysctl_req *);
- struct syncache {
- TAILQ_ENTRY(syncache) sc_hash;
- struct in_conninfo sc_inc; /* addresses */
- int sc_rxttime; /* retransmit time */
- u_int16_t sc_rxmits; /* retransmit counter */
- u_int32_t sc_tsreflect; /* timestamp to reflect */
- u_int32_t sc_tsoff; /* ts offset w/ syncookies */
- u_int32_t sc_flowlabel; /* IPv6 flowlabel */
- tcp_seq sc_irs; /* seq from peer */
- tcp_seq sc_iss; /* our ISS */
- struct mbuf *sc_ipopts; /* source route */
- u_int16_t sc_peer_mss; /* peer's MSS */
- u_int16_t sc_wnd; /* advertised window */
- u_int8_t sc_ip_ttl; /* TTL / Hop Limit */
- u_int8_t sc_ip_tos; /* TOS / Traffic Class */
- u_int8_t sc_requested_s_scale:4,
- sc_requested_r_scale:4;
- u_int16_t sc_flags;
- #if defined(TCP_OFFLOAD) || !defined(TCP_OFFLOAD_DISABLE)
- struct toedev *sc_tod; /* entry added by this TOE */
- void *sc_todctx; /* TOE driver context */
- #endif
- struct label *sc_label; /* MAC label reference */
- struct ucred *sc_cred; /* cred cache for jail checks */
- void *sc_tfo_cookie; /* for TCP Fast Open response */
- void *sc_pspare; /* TCP_SIGNATURE */
- u_int32_t sc_spare[2]; /* UTO */
- };
- /*
- * Flags for the sc_flags field.
- */
- #define SCF_NOOPT 0x01 /* no TCP options */
- #define SCF_WINSCALE 0x02 /* negotiated window scaling */
- #define SCF_TIMESTAMP 0x04 /* negotiated timestamps */
- /* MSS is implicit */
- #define SCF_UNREACH 0x10 /* icmp unreachable received */
- #define SCF_SIGNATURE 0x20 /* send MD5 digests */
- #define SCF_SACK 0x80 /* send SACK option */
- #define SCF_ECN 0x100 /* send ECN setup packet */
- #define SCF_ACE_N 0x200 /* send ACE non-ECT setup */
- #define SCF_ACE_0 0x400 /* send ACE ECT0 setup */
- #define SCF_ACE_1 0x800 /* send ACE ECT1 setup */
- #define SCF_ACE_CE 0x1000 /* send ACE CE setup */
- struct syncache_head {
- struct mtx sch_mtx;
- TAILQ_HEAD(sch_head, syncache) sch_bucket;
- struct callout sch_timer;
- int sch_nextc;
- u_int sch_length;
- struct tcp_syncache *sch_sc;
- time_t sch_last_overflow;
- };
- #define SYNCOOKIE_SECRET_SIZE 16
- #define SYNCOOKIE_LIFETIME 15 /* seconds */
- struct syncookie_secret {
- volatile u_int oddeven;
- uint8_t key[2][SYNCOOKIE_SECRET_SIZE];
- struct callout reseed;
- u_int lifetime;
- };
- #define TCP_SYNCACHE_PAUSE_TIME SYNCOOKIE_LIFETIME
- #define TCP_SYNCACHE_MAX_BACKOFF 6 /* 16 minutes */
- struct tcp_syncache {
- struct syncache_head *hashbase;
- uma_zone_t zone;
- u_int hashsize;
- u_int hashmask;
- u_int bucket_limit;
- u_int cache_limit;
- u_int rexmt_limit;
- uint32_t hash_secret;
- struct vnet *vnet;
- struct syncookie_secret secret;
- struct mtx pause_mtx;
- struct callout pause_co;
- time_t pause_until;
- uint8_t pause_backoff;
- volatile bool paused;
- };
- /* Internal use for the syncookie functions. */
- union syncookie {
- uint8_t cookie;
- struct {
- uint8_t odd_even:1,
- sack_ok:1,
- wscale_idx:3,
- mss_idx:3;
- } flags;
- };
- #endif /* _KERNEL */
- #endif /* !_NETINET_TCP_SYNCACHE_H_ */
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