#include <sys/tree.h>
#include <sys/types.h>
#include <sys/sysctl.h>
#include <sys/malloc.h>
#include <sys/param.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <netinet/libalias/alias_sctp.h>

Include dependency graph for alias_local.h:

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Go to the source code of this file.

Data Structures
struct	group_in

struct	libalias

Macros
#define	INADDR_NONE 0xffffffff

#define	GET_ALIAS_PORT -1

#define	GET_ALIAS_ID GET_ALIAS_PORT

#define	INET_NTOA_BUF(buf) (buf)

#define	LIBALIAS_LOCK_INIT(l) mtx_init(&l->mutex, "per-instance libalias mutex", NULL, MTX_DEF)

#define	LIBALIAS_LOCK_ASSERT(l) mtx_assert(&l->mutex, MA_OWNED)

#define	LIBALIAS_LOCK(l) mtx_lock(&l->mutex)

#define	LIBALIAS_UNLOCK(l) mtx_unlock(&l->mutex)

#define	LIBALIAS_LOCK_DESTROY(l) mtx_destroy(&l->mutex)

#define	ADJUST_CHECKSUM(acc, cksum)

Enumerations
enum	alias_tcp_state { ALIAS_TCP_STATE_NOT_CONNECTED , ALIAS_TCP_STATE_CONNECTED , ALIAS_TCP_STATE_DISCONNECTED }

Functions
void	AliasSctpInit (struct libalias *la)
	Initialises the SCTP NAT Implementation. More...

void	AliasSctpTerm (struct libalias *la)
	Cleans-up the SCTP NAT Implementation prior to unloading. More...

int	SctpAlias (struct libalias la, struct ip ip, int direction)
	Handles SCTP packets passed from libalias. More...

void	DifferentialChecksum (u_short _cksum, void _new, void *_old, int _n)

struct alias_link *	AddLink (struct libalias *la, struct in_addr src_addr, struct in_addr dst_addr, struct in_addr alias_addr, u_short src_port, u_short dst_port, int alias_param, int link_type)

struct alias_link *	FindIcmpIn (struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr, u_short _id_alias, int _create)

struct alias_link *	FindIcmpOut (struct libalias *la, struct in_addr _src_addr, struct in_addr _dst_addr, u_short _id, int _create)

struct alias_link *	FindFragmentIn1 (struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr, u_short _ip_id)

struct alias_link *	FindFragmentIn2 (struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr, u_short _ip_id)

struct alias_link *	AddFragmentPtrLink (struct libalias *la, struct in_addr _dst_addr, u_short _ip_id)

struct alias_link *	FindFragmentPtr (struct libalias *la, struct in_addr _dst_addr, u_short _ip_id)

struct alias_link *	FindProtoIn (struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr, u_char _proto)

struct alias_link *	FindProtoOut (struct libalias *la, struct in_addr _src_addr, struct in_addr _dst_addr, u_char _proto)

struct alias_link *	FindUdpTcpIn (struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr, u_short _dst_port, u_short _alias_port, u_char _proto, int _create)

struct alias_link *	FindUdpTcpOut (struct libalias *la, struct in_addr _src_addr, struct in_addr _dst_addr, u_short _src_port, u_short _dst_port, u_char _proto, int _create)

struct alias_link *	AddPptp (struct libalias *la, struct in_addr _src_addr, struct in_addr _dst_addr, struct in_addr _alias_addr, u_int16_t _src_call_id)

struct alias_link *	FindPptpOutByCallId (struct libalias *la, struct in_addr _src_addr, struct in_addr _dst_addr, u_int16_t _src_call_id)

struct alias_link *	FindPptpInByCallId (struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr, u_int16_t _dst_call_id)

struct alias_link *	FindPptpOutByPeerCallId (struct libalias *la, struct in_addr _src_addr, struct in_addr _dst_addr, u_int16_t _dst_call_id)

struct alias_link *	FindPptpInByPeerCallId (struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr, u_int16_t _alias_call_id)

struct alias_link *	FindRtspOut (struct libalias *la, struct in_addr _src_addr, struct in_addr _dst_addr, u_short _src_port, u_short _alias_port, u_char _proto)

struct in_addr	FindOriginalAddress (struct libalias *la, struct in_addr _alias_addr)

struct in_addr	FindAliasAddress (struct libalias *la, struct in_addr _original_addr)

struct in_addr	FindSctpRedirectAddress (struct libalias la, struct sctp_nat_msg sm)

int	FindNewPortGroup (struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr, u_short _src_port, u_short _dst_port, u_short _port_count, u_char _proto, u_char _align)

void	GetFragmentAddr (struct alias_link _lnk, struct in_addr _src_addr)

void	SetFragmentAddr (struct alias_link *_lnk, struct in_addr _src_addr)

void	GetFragmentPtr (struct alias_link _lnk, void *_fptr)

void	SetFragmentPtr (struct alias_link _lnk, void fptr)

void	SetStateIn (struct alias_link *_lnk, int _state)

void	SetStateOut (struct alias_link *_lnk, int _state)

int	GetStateIn (struct alias_link *_lnk)

int	GetStateOut (struct alias_link *_lnk)

struct in_addr	GetOriginalAddress (struct alias_link *_lnk)

struct in_addr	GetDestAddress (struct alias_link *_lnk)

struct in_addr	GetAliasAddress (struct alias_link *_lnk)

struct in_addr	GetDefaultAliasAddress (struct libalias *la)

void	SetDefaultAliasAddress (struct libalias *la, struct in_addr _alias_addr)

u_short	GetOriginalPort (struct alias_link *_lnk)

u_short	GetAliasPort (struct alias_link *_lnk)

struct in_addr	GetProxyAddress (struct alias_link *_lnk)

void	SetProxyAddress (struct alias_link *_lnk, struct in_addr _addr)

u_short	GetProxyPort (struct alias_link *_lnk)

void	SetProxyPort (struct alias_link *_lnk, u_short _port)

void	SetAckModified (struct alias_link *_lnk)

int	GetAckModified (struct alias_link *_lnk)

int	GetDeltaAckIn (u_long, struct alias_link *_lnk)

int	GetDeltaSeqOut (u_long, struct alias_link *lnk)

void	AddSeq (struct alias_link *lnk, int delta, u_int ip_hl, u_short ip_len, u_long th_seq, u_int th_off)

void	SetExpire (struct alias_link *_lnk, int _expire)

void	SetProtocolFlags (struct alias_link *_lnk, int _pflags)

int	GetProtocolFlags (struct alias_link *_lnk)

void	SetDestCallId (struct alias_link *_lnk, u_int16_t _cid)

void	PunchFWHole (struct alias_link *_lnk)

void	HouseKeeping (struct libalias *)

int	ProxyCheck (struct libalias la, struct in_addr proxy_server_addr, u_short *proxy_server_port, struct in_addr src_addr, struct in_addr dst_addr, u_short dst_port, u_char ip_p)

void	ProxyModify (struct libalias la, struct alias_link _lnk, struct ip *_pip, int _maxpacketsize, int _proxy_type)

Variables
int	LibAliasTime

Macro Definition Documentation

◆ ADJUST_CHECKSUM

#define ADJUST_CHECKSUM	(	acc,
		cksum
	)

Value:

        do { \
                acc += cksum; \
                if (acc < 0) { \
                        acc = -acc; \
                        acc = (acc >> 16) + (acc & 0xffff); \
                        acc += acc >> 16; \
                        cksum = (u_short) ~acc; \
                } else { \
                        acc = (acc >> 16) + (acc & 0xffff); \
                        acc += acc >> 16; \
                        cksum = (u_short) acc; \
                } \
        } while (0)

Definition at line 194 of file alias_local.h.

◆ GET_ALIAS_ID

#define GET_ALIAS_ID GET_ALIAS_PORT

Definition at line 71 of file alias_local.h.

◆ GET_ALIAS_PORT

#define GET_ALIAS_PORT -1

Definition at line 70 of file alias_local.h.

◆ INADDR_NONE

#define INADDR_NONE 0xffffffff

Definition at line 62 of file alias_local.h.

◆ INET_NTOA_BUF

#define INET_NTOA_BUF ( buf ) (buf)

Definition at line 74 of file alias_local.h.

◆ LIBALIAS_LOCK

#define LIBALIAS_LOCK ( l ) mtx_lock(&l->mutex)

Definition at line 175 of file alias_local.h.

◆ LIBALIAS_LOCK_ASSERT

#define LIBALIAS_LOCK_ASSERT ( l ) mtx_assert(&l->mutex, MA_OWNED)

Definition at line 174 of file alias_local.h.

◆ LIBALIAS_LOCK_DESTROY

#define LIBALIAS_LOCK_DESTROY ( l ) mtx_destroy(&l->mutex)

Definition at line 177 of file alias_local.h.

◆ LIBALIAS_LOCK_INIT

#define LIBALIAS_LOCK_INIT ( l ) mtx_init(&l->mutex, "per-instance libalias mutex", NULL, MTX_DEF)

Definition at line 172 of file alias_local.h.

◆ LIBALIAS_UNLOCK

#define LIBALIAS_UNLOCK ( l ) mtx_unlock(&l->mutex)

Definition at line 176 of file alias_local.h.

Enumeration Type Documentation

◆ alias_tcp_state

enum alias_tcp_state

Enumerator
ALIAS_TCP_STATE_NOT_CONNECTED
ALIAS_TCP_STATE_CONNECTED
ALIAS_TCP_STATE_DISCONNECTED

Definition at line 350 of file alias_local.h.

Function Documentation

◆ AddFragmentPtrLink()

struct alias_link * AddFragmentPtrLink	(	struct libalias *	la,
		struct in_addr	_dst_addr,
		u_short	_ip_id
	)

Definition at line 1069 of file alias_db.c.

References AddLink(), ANY_ADDR, alias_link::dst_addr, ip_id, alias_link::la, LIBALIAS_LOCK_ASSERT, LINK_FRAGMENT_PTR, NO_DEST_PORT, and NO_SRC_PORT.

Referenced by LibAliasSaveFragment().

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◆ AddLink()

struct alias_link * AddLink	(	struct libalias *	la,
		struct in_addr	src_addr,
		struct in_addr	dst_addr,
		struct in_addr	alias_addr,
		u_short	src_port,
		u_short	dst_port,
		int	alias_param,
		int	link_type
	)

Definition at line 564 of file alias_db.c.

References tcp_dat::ack, tcp_state::ack_modified, ack_data_record::active, alias_link::alias_addr, group_in::alias_addr, alias_link::alias_port, ALIAS_TCP_STATE_NOT_CONNECTED, alias_link::data, alias_link::dst_addr, alias_link::dst_port, expire, alias_link::expire, alias_link::flags, FRAGMENT_ID_EXPIRE_TIME, FRAGMENT_PTR_EXPIRE_TIME, libalias::fragmentIdLinkCount, libalias::fragmentPtrLinkCount, tcp_dat::fwhole, GetNewPort(), ICMP_EXPIRE_TIME, libalias::icmpLinkCount, tcp_state::in, INADDR_ANY, tcp_state::index, alias_link::la, LIBALIAS_LOCK_ASSERT, LibAliasTime, LINK_ADDR, LINK_FRAGMENT_ID, LINK_FRAGMENT_PTR, LINK_ICMP, LINK_PARTIALLY_SPECIFIED, LINK_PPTP, LINK_TCP, alias_link::link_type, group_in::link_type, LINK_UDP, LINK_UNKNOWN_DEST_ADDR, LINK_UNKNOWN_DEST_PORT, N_LINK_TCP_DATA, tcp_state::out, libalias::packetAliasMode, group_in::partial, alias_link::pflags, PKT_ALIAS_LOG, libalias::pptpLinkCount, PROTO_EXPIRE_TIME, libalias::protoLinkCount, alias_link::proxy_addr, alias_link::proxy_port, in_addr::s_addr, alias_link::server, ShowAliasStats(), alias_link::sockfd, alias_link::src_addr, alias_link::src_port, StartPointIn(), tcp_dat::state, alias_link::tcp, TCP_EXPIRE_INITIAL, libalias::tcpLinkCount, alias_link::time, alias_link::timestamp, UDP_EXPIRE_TIME, and libalias::udpLinkCount.

Referenced by AddFragmentPtrLink(), AddPptp(), AliasHandleFtpIn(), FindFragmentIn1(), FindIcmpIn(), FindIcmpOut(), FindProtoIn(), FindProtoOut(), FindRtspOut(), FindUdpTcpIn(), FindUdpTcpOut(), LibAliasRedirectAddr(), LibAliasRedirectPort(), LibAliasRedirectProto(), NewFtpMessage(), and ReLink().

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◆ AddPptp()

struct alias_link * AddPptp	(	struct libalias *	la,
		struct in_addr	_src_addr,
		struct in_addr	_dst_addr,
		struct in_addr	_alias_addr,
		u_int16_t	_src_call_id
	)

Definition at line 1211 of file alias_db.c.

References AddLink(), alias_link::alias_addr, alias_link::dst_addr, GET_ALIAS_PORT, alias_link::la, LIBALIAS_LOCK_ASSERT, LINK_PPTP, and alias_link::src_addr.

Referenced by AliasHandlePptpOut().

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◆ AddSeq()

void AddSeq	(	struct alias_link *	lnk,
		int	delta,
		u_int	ip_hl,
		u_short	ip_len,
		u_long	th_seq,
		u_int	th_off
	)

Definition at line 1672 of file alias_db.c.

References tcp_dat::ack, ack_data_record::ack_new, ack_data_record::ack_old, ack_data_record::active, alias_link::data, ack_data_record::delta, tcp_state::index, ip_hl, ip_len, N_LINK_TCP_DATA, tcp_dat::state, and alias_link::tcp.

Referenced by alias_rtsp_out(), AliasHandleIrcOut(), NewFtpMessage(), and ProxyEncodeTcpStream().

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◆ AliasSctpInit()

void AliasSctpInit ( struct libalias * la )

Initialises the SCTP NAT Implementation.

Creates the look-up tables and the timer queue and initialises all state variables

Parameters

la	Pointer to the relevant libalias instance

Definition at line 653 of file alias_sctp.c.

Referenced by LibAliasInit().

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◆ AliasSctpTerm()

void AliasSctpTerm ( struct libalias * la )

Cleans-up the SCTP NAT Implementation prior to unloading.

Removes all entries from the timer queue, freeing associations as it goes. We then free memory allocated to the look-up tables and the time queue

NOTE: We do not need to traverse the look-up tables as each association will always have an entry in the timer queue, freeing this memory once will free all memory allocated to entries in the look-up tables

Parameters

la	Pointer to the relevant libalias instance

Definition at line 694 of file alias_sctp.c.

Referenced by LibAliasInit(), and LibAliasUninit().

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◆ DifferentialChecksum()

void DifferentialChecksum	(	u_short *	_cksum,
		void *	_new,
		void *	_old,
		int	_n
	)

Definition at line 154 of file alias_util.c.

Referenced by alias_rtsp_out(), AliasHandleIrcOut(), AliasHandlePptpGreIn(), AliasHandlePptpGreOut(), FragmentIn(), FragmentOut(), IcmpAliasIn1(), IcmpAliasIn2(), IcmpAliasOut1(), IcmpAliasOut2(), LibAliasFragmentIn(), LibAliasUnaliasOut(), NewFtpMessage(), ProtoAliasIn(), ProtoAliasOut(), UdpAliasIn(), and UdpAliasOut().

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◆ FindAliasAddress()

struct in_addr FindAliasAddress	(	struct libalias *	la,
		struct in_addr	_original_addr
	)

Definition at line 1363 of file alias_db.c.

References alias_link::alias_addr, libalias::aliasAddress, ANY_ADDR, FindLinkOut(), INADDR_ANY, alias_link::la, LIBALIAS_LOCK_ASSERT, LINK_ADDR, and in_addr::s_addr.

Referenced by alias_rtsp_out(), FindIcmpOut(), FindProtoOut(), FindRtspOut(), FindUdpTcpOut(), and FragmentOut().

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◆ FindFragmentIn1()

struct alias_link * FindFragmentIn1	(	struct libalias *	la,
		struct in_addr	_dst_addr,
		struct in_addr	_alias_addr,
		u_short	_ip_id
	)

Definition at line 1038 of file alias_db.c.

References AddLink(), alias_link::alias_addr, ANY_ADDR, alias_link::dst_addr, FindLinkIn(), ip_id, alias_link::la, LIBALIAS_LOCK_ASSERT, LINK_FRAGMENT_ID, NO_DEST_PORT, and NO_SRC_PORT.

Referenced by LibAliasInLocked().

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◆ FindFragmentIn2()

struct alias_link * FindFragmentIn2	(	struct libalias *	la,
		struct in_addr	_dst_addr,
		struct in_addr	_alias_addr,
		u_short	_ip_id
	)

Definition at line 1059 of file alias_db.c.

References alias_link::alias_addr, alias_link::dst_addr, FindLinkIn(), ip_id, alias_link::la, LIBALIAS_LOCK_ASSERT, LINK_FRAGMENT_ID, and NO_DEST_PORT.

Referenced by FragmentIn().

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◆ FindFragmentPtr()

struct alias_link * FindFragmentPtr	(	struct libalias *	la,
		struct in_addr	_dst_addr,
		u_short	_ip_id
	)

Definition at line 1079 of file alias_db.c.

References ANY_ADDR, alias_link::dst_addr, FindLinkIn(), ip_id, alias_link::la, LIBALIAS_LOCK_ASSERT, LINK_FRAGMENT_PTR, and NO_DEST_PORT.

Referenced by LibAliasGetFragment().

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◆ FindIcmpIn()

struct alias_link * FindIcmpIn	(	struct libalias *	la,
		struct in_addr	_dst_addr,
		struct in_addr	_alias_addr,
		u_short	_id_alias,
		int	_create
	)

Definition at line 992 of file alias_db.c.

References AddLink(), alias_link::alias_addr, alias_link::dst_addr, FindLinkIn(), FindOriginalAddress(), alias_link::la, LIBALIAS_LOCK_ASSERT, LINK_ICMP, NO_DEST_PORT, libalias::packetAliasMode, and PKT_ALIAS_DENY_INCOMING.

Referenced by IcmpAliasIn1(), IcmpAliasIn2(), and LibAliasUnaliasOut().

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◆ FindIcmpOut()

struct alias_link * FindIcmpOut	(	struct libalias *	la,
		struct in_addr	_src_addr,
		struct in_addr	_dst_addr,
		u_short	_id,
		int	_create
	)

Definition at line 1015 of file alias_db.c.

References AddLink(), alias_link::dst_addr, FindAliasAddress(), FindLinkOut(), GET_ALIAS_ID, alias_link::la, LIBALIAS_LOCK_ASSERT, LINK_ICMP, NO_DEST_PORT, and alias_link::src_addr.

Referenced by IcmpAliasOut1(), and IcmpAliasOut2().

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◆ FindNewPortGroup()

int FindNewPortGroup	(	struct libalias *	la,
		struct in_addr	_dst_addr,
		struct in_addr	_alias_addr,
		u_short	_src_port,
		u_short	_dst_port,
		u_short	_port_count,
		u_char	_proto,
		u_char	_align
	)

Definition at line 344 of file alias_db.c.

References _RandomPort(), alias_link::alias_addr, alias_link::dst_addr, alias_link::dst_port, FindLinkIn(), GET_NEW_PORT_MAX_ATTEMPTS, IPPROTO_TCP, IPPROTO_UDP, alias_link::la, LIBALIAS_LOCK_ASSERT, LINK_TCP, alias_link::link_type, LINK_UDP, libalias::packetAliasMode, and PKT_ALIAS_SAME_PORTS.

Referenced by alias_rtsp_out().

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◆ FindOriginalAddress()

struct in_addr FindOriginalAddress	(	struct libalias *	la,
		struct in_addr	_alias_addr
	)

Definition at line 1332 of file alias_db.c.

References server::addr, alias_link::alias_addr, libalias::aliasAddress, ANY_ADDR, FindLinkIn(), INADDR_ANY, INADDR_NONE, alias_link::la, LIBALIAS_LOCK_ASSERT, LINK_ADDR, server::next, in_addr::s_addr, alias_link::server, alias_link::src_addr, and libalias::targetAddress.

Referenced by FindIcmpIn(), FindProtoIn(), FindSctpRedirectAddress(), and FindUdpTcpIn().

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◆ FindPptpInByCallId()

struct alias_link * FindPptpInByCallId	(	struct libalias *	la,
		struct in_addr	_dst_addr,
		struct in_addr	_alias_addr,
		u_int16_t	_dst_call_id
	)

Definition at line 1261 of file alias_db.c.

References alias_link::alias_addr, alias_link::dst_addr, alias_link::dst_port, alias_link::la, LIBALIAS_LOCK_ASSERT, alias_link::pptp, in_addr::s_addr, and UseLink().

Referenced by AliasHandlePptpIn().

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◆ FindPptpInByPeerCallId()

struct alias_link * FindPptpInByPeerCallId	(	struct libalias *	la,
		struct in_addr	_dst_addr,
		struct in_addr	_alias_addr,
		u_int16_t	_alias_call_id
	)

Definition at line 1279 of file alias_db.c.

References alias_link::alias_addr, alias_link::alias_port, alias_link::dst_addr, alias_link::la, LIBALIAS_LOCK_ASSERT, alias_link::pptp, and in_addr::s_addr.

Referenced by AliasHandlePptpGreIn(), and AliasHandlePptpIn().

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◆ FindPptpOutByCallId()

struct alias_link * FindPptpOutByCallId	(	struct libalias *	la,
		struct in_addr	_src_addr,
		struct in_addr	_dst_addr,
		u_int16_t	_src_call_id
	)

Definition at line 1227 of file alias_db.c.

References alias_link::dst_addr, alias_link::la, LIBALIAS_LOCK_ASSERT, alias_link::pptp, in_addr::s_addr, alias_link::src_addr, alias_link::src_port, and UseLink().

Referenced by AliasHandlePptpOut().

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◆ FindPptpOutByPeerCallId()

struct alias_link * FindPptpOutByPeerCallId	(	struct libalias *	la,
		struct in_addr	_src_addr,
		struct in_addr	_dst_addr,
		u_int16_t	_dst_call_id
	)

Definition at line 1244 of file alias_db.c.

References alias_link::dst_addr, alias_link::dst_port, alias_link::la, LIBALIAS_LOCK_ASSERT, alias_link::pptp, in_addr::s_addr, alias_link::src_addr, and UseLink().

Referenced by AliasHandlePptpGreOut().

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◆ FindProtoIn()

struct alias_link * FindProtoIn	(	struct libalias *	la,
		struct in_addr	_dst_addr,
		struct in_addr	_alias_addr,
		u_char	_proto
	)

Definition at line 1089 of file alias_db.c.

References AddLink(), alias_link::alias_addr, alias_link::dst_addr, FindLinkIn(), FindOriginalAddress(), alias_link::la, LIBALIAS_LOCK_ASSERT, NO_DEST_PORT, NO_SRC_PORT, libalias::packetAliasMode, and PKT_ALIAS_DENY_INCOMING.

Referenced by ProtoAliasIn().

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◆ FindProtoOut()

struct alias_link * FindProtoOut	(	struct libalias *	la,
		struct in_addr	_src_addr,
		struct in_addr	_dst_addr,
		u_char	_proto
	)

Definition at line 1112 of file alias_db.c.

References AddLink(), alias_link::dst_addr, FindAliasAddress(), FindLinkOut(), alias_link::la, LIBALIAS_LOCK_ASSERT, NO_DEST_PORT, NO_SRC_PORT, and alias_link::src_addr.

Referenced by ProtoAliasOut().

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◆ FindRtspOut()

struct alias_link * FindRtspOut	(	struct libalias *	la,
		struct in_addr	_src_addr,
		struct in_addr	_dst_addr,
		u_short	_src_port,
		u_short	_alias_port,
		u_char	_proto
	)

Definition at line 1296 of file alias_db.c.

References AddLink(), alias_link::dst_addr, FindAliasAddress(), FindLinkOut(), IPPROTO_TCP, IPPROTO_UDP, alias_link::la, LIBALIAS_LOCK_ASSERT, LINK_TCP, alias_link::link_type, LINK_UDP, alias_link::src_addr, and alias_link::src_port.

Referenced by alias_rtsp_out(), and protohandler().

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◆ FindSctpRedirectAddress()

struct in_addr FindSctpRedirectAddress	(	struct libalias *	la,
		struct sctp_nat_msg *	sm
	)

Definition at line 2459 of file alias_db.c.

References FindLinkIn(), FindOriginalAddress(), LIBALIAS_LOCK_ASSERT, LINK_SCTP, NO_DEST_PORT, in_addr::s_addr, and alias_link::src_addr.

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◆ FindUdpTcpIn()

struct alias_link * FindUdpTcpIn	(	struct libalias *	la,
		struct in_addr	_dst_addr,
		struct in_addr	_alias_addr,
		u_short	_dst_port,
		u_short	_alias_port,
		u_char	_proto,
		int	_create
	)

Definition at line 1135 of file alias_db.c.

References AddLink(), alias_link::alias_addr, alias_link::alias_port, alias_link::dst_addr, alias_link::dst_port, FindLinkIn(), FindOriginalAddress(), IPPROTO_TCP, IPPROTO_UDP, alias_link::la, LIBALIAS_LOCK_ASSERT, LINK_TCP, alias_link::link_type, LINK_UDP, libalias::packetAliasMode, and PKT_ALIAS_DENY_INCOMING.

Referenced by IcmpAliasIn2(), LibAliasUnaliasOut(), TcpAliasIn(), and UdpAliasIn().

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◆ FindUdpTcpOut()

struct alias_link * FindUdpTcpOut	(	struct libalias *	la,
		struct in_addr	_src_addr,
		struct in_addr	_dst_addr,
		u_short	_src_port,
		u_short	_dst_port,
		u_char	_proto,
		int	_create
	)

Definition at line 1174 of file alias_db.c.

References AddLink(), alias_link::dst_addr, alias_link::dst_port, FindAliasAddress(), FindLinkOut(), GET_ALIAS_PORT, IPPROTO_TCP, IPPROTO_UDP, alias_link::la, LIBALIAS_LOCK_ASSERT, LINK_TCP, alias_link::link_type, LINK_UDP, alias_link::src_addr, and alias_link::src_port.

Referenced by alias_pna_out(), alias_skinny_opnrcvch_ack(), AliasHandleIrcOut(), IcmpAliasOut2(), TcpAliasOut(), and UdpAliasOut().

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◆ GetAckModified()

int GetAckModified ( struct alias_link * _lnk )

Definition at line 1576 of file alias_db.c.

References tcp_state::ack_modified, alias_link::data, tcp_dat::state, and alias_link::tcp.

Referenced by ProxyEncodeTcpStream(), TcpAliasIn(), and TcpAliasOut().

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◆ GetAliasAddress()

struct in_addr GetAliasAddress ( struct alias_link * _lnk )

Definition at line 1500 of file alias_db.c.

References INADDR_ANY.

Referenced by alias_skinny_opnrcvch_ack(), alias_skinny_reg_msg(), AliasHandleFtpIn(), AliasHandleIrcOut(), AliasHandlePptpGreOut(), AliasHandlePptpIn(), AliasHandlePptpOut(), IcmpAliasOut1(), IcmpAliasOut2(), NewFtpMessage(), ProtoAliasOut(), TcpAliasIn(), TcpAliasOut(), UdpAliasIn(), and UdpAliasOut().

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◆ GetAliasPort()

u_short GetAliasPort ( struct alias_link * _lnk )

Definition at line 1529 of file alias_db.c.

References alias_link::alias_port.

Referenced by alias_pna_out(), alias_skinny_opnrcvch_ack(), alias_skinny_port_msg(), AliasHandleIrcOut(), AliasHandlePptpOut(), IcmpAliasOut1(), IcmpAliasOut2(), NewFtpMessage(), TcpAliasOut(), and UdpAliasOut().

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◆ GetDefaultAliasAddress()

struct in_addr GetDefaultAliasAddress ( struct libalias * la )

Definition at line 1509 of file alias_db.c.

References LIBALIAS_LOCK_ASSERT.

Referenced by LibAliasOutLocked().

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◆ GetDeltaAckIn()

int GetDeltaAckIn	(	u_long	ack,
		struct alias_link *	_lnk
	)

Definition at line 1588 of file alias_db.c.

References tcp_dat::ack, ack_data_record::ack_new, ack_data_record::active, alias_link::data, ack_data_record::delta, tcp_state::index, N_LINK_TCP_DATA, SeqDiff(), tcp_dat::state, and alias_link::tcp.

Referenced by TcpAliasIn().

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◆ GetDeltaSeqOut()

int GetDeltaSeqOut	(	u_long	seq,
		struct alias_link *	lnk
	)

Definition at line 1630 of file alias_db.c.

References tcp_dat::ack, ack_data_record::ack_old, ack_data_record::active, alias_link::data, ack_data_record::delta, tcp_state::index, N_LINK_TCP_DATA, SeqDiff(), tcp_dat::state, and alias_link::tcp.

Referenced by alias_rtsp_out(), AliasHandleIrcOut(), NewFtpMessage(), ProxyEncodeTcpStream(), and TcpAliasOut().

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◆ GetDestAddress()

struct in_addr GetDestAddress ( struct alias_link * _lnk )

Definition at line 1494 of file alias_db.c.

Referenced by alias_pna_out(), AliasHandlePptpIn(), AliasHandlePptpOut(), NewFtpMessage(), and PunchFWHole().

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◆ GetFragmentAddr()

void GetFragmentAddr	(	struct alias_link *	_lnk,
		struct in_addr *	_src_addr
	)

Definition at line 1403 of file alias_db.c.

References alias_link::data, alias_link::frag_addr, and alias_link::src_addr.

Referenced by FragmentIn().

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◆ GetFragmentPtr()

void GetFragmentPtr	(	struct alias_link *	_lnk,
		void **	_fptr
	)

Definition at line 1415 of file alias_db.c.

References alias_link::data, and alias_link::frag_ptr.

Referenced by LibAliasGetFragment().

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◆ GetOriginalAddress()

struct in_addr GetOriginalAddress ( struct alias_link * _lnk )

Definition at line 1485 of file alias_db.c.

References INADDR_ANY.

Referenced by alias_rtsp_out(), AliasHandleFtpIn(), AliasHandlePptpGreIn(), AliasHandlePptpOut(), IcmpAliasIn1(), IcmpAliasIn2(), LibAliasUnaliasOut(), ProtoAliasIn(), PunchFWHole(), TcpAliasIn(), and UdpAliasIn().

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◆ GetOriginalPort()

u_short GetOriginalPort ( struct alias_link * _lnk )

Definition at line 1523 of file alias_db.c.

References alias_link::src_port.

Referenced by AliasHandlePptpGreIn(), AliasHandlePptpIn(), IcmpAliasIn1(), IcmpAliasIn2(), LibAliasUnaliasOut(), PunchFWHole(), TcpAliasIn(), and UdpAliasIn().

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◆ GetProtocolFlags()

int GetProtocolFlags ( struct alias_link * _lnk )

Definition at line 1723 of file alias_db.c.

References alias_link::pflags.

Referenced by AliasHandleFtpIn(), and AliasHandleFtpOut().

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◆ GetProxyAddress()

struct in_addr GetProxyAddress ( struct alias_link * _lnk )

Definition at line 1551 of file alias_db.c.

Referenced by ProxyEncodeTcpStream(), TcpAliasIn(), and UdpAliasIn().

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◆ GetProxyPort()

u_short GetProxyPort ( struct alias_link * _lnk )

Definition at line 1563 of file alias_db.c.

References alias_link::proxy_port.

Referenced by ProxyEncodeTcpStream(), TcpAliasIn(), and UdpAliasIn().

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◆ GetStateIn()

int GetStateIn ( struct alias_link * _lnk )

Definition at line 1471 of file alias_db.c.

References alias_link::data, tcp_state::in, tcp_dat::state, and alias_link::tcp.

Referenced by TcpMonitorIn().

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◆ GetStateOut()

int GetStateOut ( struct alias_link * _lnk )

Definition at line 1478 of file alias_db.c.

References alias_link::data, tcp_state::out, tcp_dat::state, and alias_link::tcp.

Referenced by TcpMonitorOut().

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◆ HouseKeeping()

void HouseKeeping ( struct libalias * la )

Definition at line 1753 of file alias_db.c.

References CleanupLink(), alias_link::la, LIBALIAS_LOCK_ASSERT, LibAliasTime, libalias::tcpLinkCount, and libalias::udpLinkCount.

Referenced by LibAliasInLocked(), and LibAliasOutLocked().

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◆ ProxyCheck()

int ProxyCheck	(	struct libalias *	la,
		struct in_addr *	proxy_server_addr,
		u_short *	proxy_server_port,
		struct in_addr	src_addr,
		struct in_addr	dst_addr,
		u_short	dst_port,
		u_char	ip_p
	)

Definition at line 457 of file alias_proxy.c.

References proxy_entry::dst_addr, proxy_entry::dst_mask, ip_p, proxy_entry::la, LIBALIAS_LOCK_ASSERT, proxy_entry::next, proxy_entry::proto, proxy_entry::proxy_port, proxy_entry::proxy_type, libalias::proxyList, in_addr::s_addr, proxy_entry::server_addr, proxy_entry::server_port, proxy_entry::src_addr, and proxy_entry::src_mask.

Referenced by TcpAliasOut(), and UdpAliasOut().

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◆ ProxyModify()

void ProxyModify	(	struct libalias *	la,
		struct alias_link *	_lnk,
		struct ip *	_pip,
		int	_maxpacketsize,
		int	_proxy_type
	)

Definition at line 494 of file alias_proxy.c.

References LIBALIAS_LOCK_ASSERT, PROXY_TYPE_ENCODE_IPHDR, PROXY_TYPE_ENCODE_TCPSTREAM, ProxyEncodeIpHeader(), and ProxyEncodeTcpStream().

Referenced by TcpAliasOut(), and UdpAliasOut().

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◆ PunchFWHole()

void PunchFWHole ( struct alias_link * _lnk )

Build rule

Definition at line 2318 of file alias_db.c.

References alias_link::data, fill_rule(), libalias::fireWallActiveNum, libalias::fireWallBaseNum, libalias::fireWallFD, libalias::fireWallField, libalias::fireWallNumNums, fw_setfield, fw_tstfield, tcp_dat::fwhole, GetDestAddress(), GetDestPort(), GetOriginalAddress(), GetOriginalPort(), IPPROTO_IP, IPPROTO_TCP, alias_link::la, LINK_TCP, alias_link::link_type, O_ACCEPT, libalias::packetAliasMode, rule, and alias_link::tcp.

Referenced by alias_pna_out(), alias_rtsp_out(), AliasHandleIrcOut(), NewFtpMessage(), and ReLink().

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◆ SctpAlias()

int SctpAlias	(	struct libalias *	la,
		struct ip *	pip,
		int	direction
	)

Handles SCTP packets passed from libalias.

This function needs to actually NAT/drop packets and possibly create and send AbortM or ErrorM packets in response. The process involves:

Validating the direction parameter passed by the caller
Checking and handling any expired timers for the NAT
Calling sctp_PktParser() to parse the packet
Call ProcessSctpMsg() to decide the appropriate outcome and to update the NAT tables
Based on the return code either:
- NAT the packet
- Construct and send an ErrorM|AbortM packet
- Mark the association for removal from the tables
Potentially remove the association from all lookup tables
Return the appropriate result to libalias