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29 * @(#)tcp_var.h 8.4 (Berkeley) 5/24/95
33 #ifndef _NETINET_TCP_SYNCACHE_H_
34 #define _NETINET_TCP_SYNCACHE_H_
37 void syncache_init(void);
38 void syncache_unreach(struct in_conninfo *, struct tcphdr *);
39 int syncache_expand(struct in_conninfo *, struct tcpopt *,
40 struct tcphdr *, struct socket **, struct mbuf *);
41 int tcp_offload_syncache_expand(struct in_conninfo *inc, struct tcpopt *to,
42 struct tcphdr *th, struct socket **lsop, struct mbuf *m);
43 void syncache_add(struct in_conninfo *, struct tcpopt *,
44 struct tcphdr *, struct inpcb *, struct socket **, struct mbuf *);
45 void tcp_offload_syncache_add(struct in_conninfo *, struct tcpopt *,
46 struct tcphdr *, struct inpcb *, struct socket **,
47 struct toe_usrreqs *tu, void *toepcb);
49 void syncache_chkrst(struct in_conninfo *, struct tcphdr *);
50 void syncache_badack(struct in_conninfo *);
51 int syncache_pcbcount(void);
52 int syncache_pcblist(struct sysctl_req *req, int max_pcbs, int *pcbs_exported);
55 TAILQ_ENTRY(syncache) sc_hash;
56 struct in_conninfo sc_inc; /* addresses */
57 int sc_rxttime; /* retransmit time */
58 u_int16_t sc_rxmits; /* retransmit counter */
60 u_int32_t sc_tsreflect; /* timestamp to reflect */
61 u_int32_t sc_ts; /* our timestamp to send */
62 u_int32_t sc_tsoff; /* ts offset w/ syncookies */
63 u_int32_t sc_flowlabel; /* IPv6 flowlabel */
64 tcp_seq sc_irs; /* seq from peer */
65 tcp_seq sc_iss; /* our ISS */
66 struct mbuf *sc_ipopts; /* source route */
68 u_int16_t sc_peer_mss; /* peer's MSS */
69 u_int16_t sc_wnd; /* advertised window */
70 u_int8_t sc_ip_ttl; /* IPv4 TTL */
71 u_int8_t sc_ip_tos; /* IPv4 TOS */
72 u_int8_t sc_requested_s_scale:4,
73 sc_requested_r_scale:4;
75 #define SCF_NOOPT 0x01 /* no TCP options */
76 #define SCF_WINSCALE 0x02 /* negotiated window scaling */
77 #define SCF_TIMESTAMP 0x04 /* negotiated timestamps */
79 #define SCF_UNREACH 0x10 /* icmp unreachable received */
80 #define SCF_SIGNATURE 0x20 /* send MD5 digests */
81 #define SCF_SACK 0x80 /* send SACK option */
82 #define SCF_ECN 0x100 /* send ECN setup packet */
83 #ifndef TCP_OFFLOAD_DISABLE
84 struct toe_usrreqs *sc_tu; /* TOE operations */
85 void *sc_toepcb; /* TOE protocol block */
88 struct label *sc_label; /* MAC label reference */
90 struct ucred *sc_cred; /* cred cache for jail checks */
93 #define SYNCOOKIE_SECRET_SIZE 8 /* dwords */
94 #define SYNCOOKIE_LIFETIME 16 /* seconds */
96 struct syncache_head {
98 TAILQ_HEAD(sch_head, syncache) sch_bucket;
99 struct callout sch_timer;
103 u_int32_t sch_secbits_odd[SYNCOOKIE_SECRET_SIZE];
104 u_int32_t sch_secbits_even[SYNCOOKIE_SECRET_SIZE];
105 u_int sch_reseed; /* time_uptime, seconds */
108 struct tcp_syncache {
109 struct syncache_head *hashbase;
114 u_int cache_count; /* XXX: unprotected */
121 #endif /* !_NETINET_TCP_SYNCACHE_H_ */