b67689ea7e
so that fixed TCP_SIGNATURE handling can later be merged. This is derived from follow-up work to SVN r183001 posted to net@ on Sep 13 2008. Approved by: re (gjb)
139 lines
4.7 KiB
C
139 lines
4.7 KiB
C
/*-
|
|
* 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.
|
|
* 4. 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 *, struct tcphdr *);
|
|
int syncache_expand(struct in_conninfo *, struct tcpopt *,
|
|
struct tcphdr *, struct socket **, struct mbuf *);
|
|
void syncache_add(struct in_conninfo *, struct tcpopt *,
|
|
struct tcphdr *, struct inpcb *, struct socket **, struct mbuf *,
|
|
void *, void *);
|
|
void syncache_chkrst(struct in_conninfo *, struct tcphdr *);
|
|
void syncache_badack(struct in_conninfo *);
|
|
int syncache_pcbcount(void);
|
|
int syncache_pcblist(struct sysctl_req *req, int max_pcbs, int *pcbs_exported);
|
|
|
|
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_ts; /* our timestamp to send */
|
|
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; /* IPv4 TTL */
|
|
u_int8_t sc_ip_tos; /* IPv4 TOS */
|
|
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_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 */
|
|
|
|
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;
|
|
};
|
|
|
|
#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;
|
|
};
|
|
|
|
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;
|
|
u_int hash_secret;
|
|
struct vnet *vnet;
|
|
struct syncookie_secret secret;
|
|
};
|
|
|
|
/* 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_ */
|