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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);
39 void syncache_destroy(void);
41 void syncache_unreach(struct in_conninfo *, struct tcphdr *);
42 int syncache_expand(struct in_conninfo *, struct tcpopt *,
43 struct tcphdr *, struct socket **, struct mbuf *);
44 void syncache_add(struct in_conninfo *, struct tcpopt *,
45 struct tcphdr *, struct inpcb *, struct socket **, struct mbuf *,
47 void syncache_chkrst(struct in_conninfo *, struct tcphdr *);
48 void syncache_badack(struct in_conninfo *);
49 int syncache_pcbcount(void);
50 int syncache_pcblist(struct sysctl_req *req, int max_pcbs, int *pcbs_exported);
53 TAILQ_ENTRY(syncache) sc_hash;
54 struct in_conninfo sc_inc; /* addresses */
55 int sc_rxttime; /* retransmit time */
56 u_int16_t sc_rxmits; /* retransmit counter */
57 u_int32_t sc_tsreflect; /* timestamp to reflect */
58 u_int32_t sc_ts; /* our timestamp to send */
59 u_int32_t sc_tsoff; /* ts offset w/ syncookies */
60 u_int32_t sc_flowlabel; /* IPv6 flowlabel */
61 tcp_seq sc_irs; /* seq from peer */
62 tcp_seq sc_iss; /* our ISS */
63 struct mbuf *sc_ipopts; /* source route */
64 u_int16_t sc_peer_mss; /* peer's MSS */
65 u_int16_t sc_wnd; /* advertised window */
66 u_int8_t sc_ip_ttl; /* IPv4 TTL */
67 u_int8_t sc_ip_tos; /* IPv4 TOS */
68 u_int8_t sc_requested_s_scale:4,
69 sc_requested_r_scale:4;
71 #if defined(TCP_OFFLOAD) || !defined(TCP_OFFLOAD_DISABLE)
72 struct toedev *sc_tod; /* entry added by this TOE */
73 void *sc_todctx; /* TOE driver context */
75 struct label *sc_label; /* MAC label reference */
76 struct ucred *sc_cred; /* cred cache for jail checks */
78 void *sc_pspare; /* TCP_SIGNATURE */
79 u_int32_t sc_spare[2]; /* UTO */
83 * Flags for the sc_flags field.
85 #define SCF_NOOPT 0x01 /* no TCP options */
86 #define SCF_WINSCALE 0x02 /* negotiated window scaling */
87 #define SCF_TIMESTAMP 0x04 /* negotiated timestamps */
89 #define SCF_UNREACH 0x10 /* icmp unreachable received */
90 #define SCF_SIGNATURE 0x20 /* send MD5 digests */
91 #define SCF_SACK 0x80 /* send SACK option */
92 #define SCF_ECN 0x100 /* send ECN setup packet */
94 struct syncache_head {
96 TAILQ_HEAD(sch_head, syncache) sch_bucket;
97 struct callout sch_timer;
100 struct tcp_syncache *sch_sc;
103 #define SYNCOOKIE_SECRET_SIZE 16
104 #define SYNCOOKIE_LIFETIME 15 /* seconds */
106 struct syncookie_secret {
107 volatile u_int oddeven;
108 uint8_t key[2][SYNCOOKIE_SECRET_SIZE];
109 struct callout reseed;
113 struct tcp_syncache {
114 struct syncache_head *hashbase;
121 uint32_t hash_secret;
123 struct syncookie_secret secret;
126 /* Internal use for the syncookie functions. */
138 #endif /* !_NETINET_TCP_SYNCACHE_H_ */