tcp_syncache.h File Reference

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Data Structures
struct	syncache
struct	syncache_head
struct	syncookie_secret
struct	tcp_syncache
union	syncookie

Macros
#define	SCF_NOOPT   0x01 /* no TCP options */
#define	SCF_WINSCALE   0x02 /* negotiated window scaling */
#define	SCF_TIMESTAMP   0x04 /* negotiated timestamps */
#define	SCF_UNREACH   0x10 /* icmp unreachable received */
#define	SCF_SIGNATURE   0x20 /* send MD5 digests */
#define	SCF_SACK   0x80 /* send SACK option */
#define	SCF_ECN_MASK   0x700 /* ECN codepoint mask */
#define	SCF_ECN   0x100 /* send ECN setup packet */
#define	SCF_ACE_N   0x400 /* send ACE non-ECT setup */
#define	SCF_ACE_0   0x500 /* send ACE ECT0 setup */
#define	SCF_ACE_1   0x600 /* send ACE ECT1 setup */
#define	SCF_ACE_CE   0x700 /* send ACE CE setup */
#define	SYNCOOKIE_SECRET_SIZE   16
#define	SYNCOOKIE_LIFETIME   15 /* seconds */
#define	TCP_SYNCACHE_PAUSE_TIME   SYNCOOKIE_LIFETIME
#define	TCP_SYNCACHE_MAX_BACKOFF   6 /* 16 minutes */

Functions
void	syncache_init (void)
void	syncache_unreach (struct in_conninfo *, tcp_seq, uint16_t)
int	syncache_expand (struct in_conninfo *, struct tcpopt *, struct tcphdr *, struct socket **, struct mbuf *, uint16_t)
struct socket *	syncache_add (struct in_conninfo *, struct tcpopt *, struct tcphdr *, struct inpcb *, struct socket *, struct mbuf *, void *, void *, uint8_t, uint16_t)
void	syncache_chkrst (struct in_conninfo *, struct tcphdr *, struct mbuf *, uint16_t)
void	syncache_badack (struct in_conninfo *, uint16_t)
int	syncache_pcblist (struct sysctl_req *)

Macro Definition Documentation

SCF_ACE_0

#define SCF_ACE_0   0x500 /* send ACE ECT0 setup */

Definition at line 97 of file tcp_syncache.h.

SCF_ACE_1

#define SCF_ACE_1   0x600 /* send ACE ECT1 setup */

Definition at line 98 of file tcp_syncache.h.

SCF_ACE_CE

#define SCF_ACE_CE   0x700 /* send ACE CE setup */

Definition at line 99 of file tcp_syncache.h.

SCF_ACE_N

#define SCF_ACE_N   0x400 /* send ACE non-ECT setup */

Definition at line 96 of file tcp_syncache.h.

SCF_ECN

#define SCF_ECN   0x100 /* send ECN setup packet */

Definition at line 95 of file tcp_syncache.h.

SCF_ECN_MASK

#define SCF_ECN_MASK   0x700 /* ECN codepoint mask */

Definition at line 94 of file tcp_syncache.h.

SCF_NOOPT

#define SCF_NOOPT   0x01 /* no TCP options */

Definition at line 87 of file tcp_syncache.h.

SCF_SACK

#define SCF_SACK   0x80 /* send SACK option */

Definition at line 93 of file tcp_syncache.h.

SCF_SIGNATURE

#define SCF_SIGNATURE   0x20 /* send MD5 digests */

Definition at line 92 of file tcp_syncache.h.

SCF_TIMESTAMP

#define SCF_TIMESTAMP   0x04 /* negotiated timestamps */

Definition at line 89 of file tcp_syncache.h.

SCF_UNREACH

#define SCF_UNREACH   0x10 /* icmp unreachable received */

Definition at line 91 of file tcp_syncache.h.

SCF_WINSCALE

#define SCF_WINSCALE   0x02 /* negotiated window scaling */

Definition at line 88 of file tcp_syncache.h.

SYNCOOKIE_LIFETIME

#define SYNCOOKIE_LIFETIME   15 /* seconds */

Definition at line 112 of file tcp_syncache.h.

SYNCOOKIE_SECRET_SIZE

#define SYNCOOKIE_SECRET_SIZE   16

Definition at line 111 of file tcp_syncache.h.

TCP_SYNCACHE_MAX_BACKOFF

#define TCP_SYNCACHE_MAX_BACKOFF   6 /* 16 minutes */

Definition at line 122 of file tcp_syncache.h.

TCP_SYNCACHE_PAUSE_TIME

#define TCP_SYNCACHE_PAUSE_TIME   SYNCOOKIE_LIFETIME

Definition at line 121 of file tcp_syncache.h.

Function Documentation

syncache_add()

struct socket * syncache_add	(	struct in_conninfo *	inc,
		struct tcpopt *	to,
		struct tcphdr *	th,
		struct inpcb *	inp,
		struct socket *	so,
		struct mbuf *	m,
		void *	tod,
		void *	todctx,
		uint8_t	iptos,
		uint16_t	port
	)

Definition at line 1402 of file tcp_syncache.c.

References IN6P_AUTOFLOWLABEL, inpcb::in6p_outputopts, in_conninfo::inc_flags, INC_ISIPV6, inpcb::inp_flags, inpcb::inp_ip_tos, inpcb::inp_ip_ttl, INP_RLOCK_ASSERT, INP_RUNLOCK, ip_srcroute(), ip_tos, ip_ttl, IPV6_FLOWLABEL_MASK, IS_FASTOPEN, syncache::sc_cred, syncache::sc_flags, syncache::sc_flowlabel, syncache::sc_inc, syncache::sc_ip_tos, syncache::sc_ip_ttl, syncache::sc_ipopts, syncache::sc_irs, syncache::sc_iss, syncache::sc_label, syncache::sc_peer_mss, syncache::sc_port, syncache::sc_requested_r_scale, syncache::sc_requested_s_scale, syncache::sc_rxmits, syncache::sc_tfo_cookie, syncache::sc_tod, syncache::sc_todctx, syncache::sc_tsoff, syncache::sc_tsreflect, syncache::sc_wnd, SCF_ECN, SCF_NOOPT, SCF_SACK, SCF_SIGNATURE, SCF_TIMESTAMP, SCF_WINSCALE, syncache_head::sch_last_overflow, SCH_LOCK_ASSERT, SCH_UNLOCK, sototcpcb, syncache_cookiesonly(), syncache_drop(), syncache_free(), syncache_hashbucket(), syncache_insert(), syncache_lookup(), syncache_pause(), syncache_respond(), syncache_tfo_expand(), syncache_timeout(), syncookie_generate(), tcpcb::t_flags, tcpcb::t_tfo_pending, tcp_ecn_syncache_add(), tcp_fastopen_check_cookie(), tcp_fastopen_decrement_counter(), tcp_get_flags(), tcp_log_addrs(), tcp_new_ts_offset(), TCP_PROBE5, TCPSTAT_INC, TF_NOOPT, TF_SIGNATURE, tcpopt::to_flags, tcpopt::to_mss, tcpopt::to_signature, tcpopt::to_tfo_cookie, tcpopt::to_tfo_len, tcpopt::to_tsval, tcpopt::to_wscale, TOF_FASTOPEN, TOF_MSS, TOF_SACKPERM, TOF_SCALE, TOF_SIGNATURE, TOF_TS, V_tcp_do_ecn, V_tcp_do_rfc1323, V_tcp_fastopen_server_enable, V_tcp_syncache, V_tcp_syncookies, and V_tcp_syncookiesonly.

Referenced by tcp_input_with_port(), and toe_syncache_add().

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syncache_badack()

void syncache_badack	(	struct in_conninfo *	inc,
		uint16_t	port
	)

Definition at line 732 of file tcp_syncache.c.

References syncache::sc_port, SCH_LOCK_ASSERT, SCH_UNLOCK, syncache_cookiesonly(), syncache_drop(), syncache_lookup(), and TCPSTAT_INC.

Referenced by tcp_input_with_port().

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syncache_chkrst()

void syncache_chkrst	(	struct in_conninfo *	inc,
		struct tcphdr *	th,
		struct mbuf *	m,
		uint16_t	port
	)

Definition at line 615 of file tcp_syncache.c.

References syncache::sc_irs, syncache::sc_port, syncache::sc_wnd, SCH_LOCK_ASSERT, SCH_UNLOCK, SEQ_GEQ, SEQ_LT, syncache_cookiesonly(), syncache_drop(), syncache_lookup(), syncache_respond(), tcp_get_flags(), tcp_log_addrs(), TCPSTAT_INC, and V_tcp_insecure_rst.

Referenced by tcp_input_with_port().

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syncache_expand()

int syncache_expand	(	struct in_conninfo *	inc,
		struct tcpopt *	to,
		struct tcphdr *	th,
		struct socket **	lsop,
		struct mbuf *	m,
		uint16_t	port
	)

Definition at line 1090 of file tcp_syncache.c.

References syncache::sc_flags, syncache::sc_irs, syncache::sc_iss, syncache::sc_port, syncache::sc_tod, syncache::sc_todctx, syncache::sc_tsreflect, syncache::sc_wnd, SCF_SIGNATURE, SCF_TIMESTAMP, syncache_head::sch_last_overflow, syncache_head::sch_length, SCH_LOCK_ASSERT, SCH_UNLOCK, SEQ_GT, SEQ_LEQ, syncache_cookiesonly(), syncache_free(), syncache_hashbucket(), syncache_lookup(), syncache_socket(), SYNCOOKIE_LIFETIME, syncookie_lookup(), tcp_get_flags(), tcp_log_addrs(), TCPS_SYN_RECEIVED, TCPSTAT_INC, TCPSTATES_DEC, tcpopt::to_flags, tcpopt::to_signature, tcpopt::to_tsval, toedev::tod_syncache_removed, TOF_SIGNATURE, TOF_TS, TSTMP_LT, V_tcp_syncookies, V_tcp_syncookiesonly, and V_tcp_tolerate_missing_ts.

Referenced by tcp_input_with_port(), and toe_syncache_expand().

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syncache_init()

void syncache_init

(

void

)

Definition at line 254 of file tcp_syncache.c.

References SYNCACHE_MAXREXMTS, SYNCOOKIE_LIFETIME, syncookie_reseed(), SYNCOOKIE_SECRET_SIZE, TCP_SYNCACHE_BUCKETLIMIT, TCP_SYNCACHE_HASHSIZE, TCP_SYNCACHE_PAUSE_TIME, and V_tcp_syncache.

Referenced by tcp_vnet_init().

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syncache_pcblist()

int syncache_pcblist

(

struct sysctl_req *

req

)

Definition at line 2554 of file tcp_syncache.c.

References in_conninfo::inc_flags, INC_ISIPV6, INP_IPV4, INP_IPV6, IPPROTO_TCP, syncache::sc_cred, syncache::sc_inc, syncache::sc_port, SCH_LOCK, SCH_UNLOCK, TCPS_SYN_RECEIVED, and V_tcp_syncache.

Referenced by tcp_pcblist().

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syncache_unreach()

void syncache_unreach	(	struct in_conninfo *	inc,
		tcp_seq	th_seq,
		uint16_t	port
	)

Definition at line 749 of file tcp_syncache.c.

References syncache::sc_flags, syncache::sc_iss, syncache::sc_port, syncache::sc_rxmits, SCF_UNREACH, SCH_LOCK_ASSERT, SCH_UNLOCK, syncache_cookiesonly(), syncache_drop(), syncache_lookup(), and TCPSTAT_INC.

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