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NetBSD/sys/dist/ipf/netinet/ip_proxy.h

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/* $NetBSD: ip_proxy.h,v 1.2 2005/04/03 15:05:30 martti Exp $ */
/*
* Copyright (C) 1997-2001 by Darren Reed.
*
* See the IPFILTER.LICENCE file for details on licencing.
*
* Id: ip_proxy.h,v 2.31.2.2 2005/03/12 19:33:48 darrenr Exp
*/
#ifndef _NETINET_IP_PROXY_H_
#define _NETINET_IP_PROXY_H_
#ifndef SOLARIS
#define SOLARIS (defined(sun) && (defined(__svr4__) || defined(__SVR4)))
#endif
#ifndef APR_LABELLEN
#define APR_LABELLEN 16
#endif
#define AP_SESS_SIZE 53
struct nat;
struct ipnat;
typedef struct ap_tcp {
u_short apt_sport; /* source port */
u_short apt_dport; /* destination port */
short apt_sel[2]; /* {seq,ack}{off,min} set selector */
short apt_seqoff[2]; /* sequence # difference */
tcp_seq apt_seqmin[2]; /* don't change seq-off until after this */
short apt_ackoff[2]; /* sequence # difference */
tcp_seq apt_ackmin[2]; /* don't change seq-off until after this */
u_char apt_state[2]; /* connection state */
} ap_tcp_t;
typedef struct ap_udp {
u_short apu_sport; /* source port */
u_short apu_dport; /* destination port */
} ap_udp_t;
typedef struct ap_session {
struct aproxy *aps_apr;
union {
struct ap_tcp apu_tcp;
struct ap_udp apu_udp;
} aps_un;
u_int aps_flags;
U_QUAD_T aps_bytes; /* bytes sent */
U_QUAD_T aps_pkts; /* packets sent */
void *aps_nat; /* pointer back to nat struct */
void *aps_data; /* private data */
int aps_p; /* protocol */
int aps_psiz; /* size of private data */
struct ap_session *aps_hnext;
struct ap_session *aps_next;
} ap_session_t;
#define aps_sport aps_un.apu_tcp.apt_sport
#define aps_dport aps_un.apu_tcp.apt_dport
#define aps_sel aps_un.apu_tcp.apt_sel
#define aps_seqoff aps_un.apu_tcp.apt_seqoff
#define aps_seqmin aps_un.apu_tcp.apt_seqmin
#define aps_state aps_un.apu_tcp.apt_state
#define aps_ackoff aps_un.apu_tcp.apt_ackoff
#define aps_ackmin aps_un.apu_tcp.apt_ackmin
typedef struct ap_control {
char apc_label[APR_LABELLEN];
u_char apc_p;
/*
* The following fields are upto the proxy's apr_ctl routine to deal
* with. When the proxy gets this in kernel space, apc_data will
* point to a malloc'd region of memory of apc_dsize bytes. If the
* proxy wants to keep that memory, it must set apc_data to NULL
* before it returns. It is expected if this happens that it will
* take care to free it in apr_fini or otherwise as appropriate.
* apc_cmd is provided as a standard place to put simple commands,
* with apc_arg being available to put a simple arg.
*/
u_long apc_cmd;
u_long apc_arg;
void *apc_data;
size_t apc_dsize;
} ap_ctl_t;
typedef struct aproxy {
struct aproxy *apr_next;
char apr_label[APR_LABELLEN]; /* Proxy label # */
u_char apr_p; /* protocol */
int apr_ref; /* +1 per rule referencing it */
int apr_flags;
int (* apr_init) __P((void));
void (* apr_fini) __P((void));
int (* apr_new) __P((fr_info_t *, ap_session_t *, struct nat *));
void (* apr_del) __P((ap_session_t *));
int (* apr_inpkt) __P((fr_info_t *, ap_session_t *, struct nat *));
int (* apr_outpkt) __P((fr_info_t *, ap_session_t *, struct nat *));
int (* apr_match) __P((fr_info_t *, ap_session_t *, struct nat *));
int (* apr_ctl) __P((struct aproxy *, struct ap_control *));
} aproxy_t;
#define APR_DELETE 1
#define APR_ERR(x) ((x) << 16)
#define APR_EXIT(x) (((x) >> 16) & 0xffff)
#define APR_INC(x) ((x) & 0xffff)
/*
* Generic #define's to cover missing things in the kernel
*/
#ifndef isdigit
#define isdigit(x) ((x) >= '0' && (x) <= '9')
#endif
#ifndef isupper
#define isupper(x) (((unsigned)(x) >= 'A') && ((unsigned)(x) <= 'Z'))
#endif
#ifndef islower
#define islower(x) (((unsigned)(x) >= 'a') && ((unsigned)(x) <= 'z'))
#endif
#ifndef isalpha
#define isalpha(x) (isupper(x) || islower(x))
#endif
#ifndef toupper
#define toupper(x) (isupper(x) ? (x) : (x) - 'a' + 'A')
#endif
#ifndef isspace
#define isspace(x) (((x) == ' ') || ((x) == '\r') || ((x) == '\n') || \
((x) == '\t') || ((x) == '\b'))
#endif
/*
* This is the scratch buffer size used to hold strings from the TCP stream
* that we may want to parse. It's an arbitrary size, really, but it must
* be at least as large as IPF_FTPBUFSZ.
*/
#define FTP_BUFSZ 120
/*
* This buffer, however, doesn't need to be nearly so big. It just needs to
* be able to squeeze in the largest command it needs to rewrite, Which ones
* does it rewrite? EPRT, PORT, 227 replies.
*/
#define IPF_FTPBUFSZ 80 /* This *MUST* be >= 53! */
typedef struct ftpside {
char *ftps_rptr;
char *ftps_wptr;
void *ftps_ifp;
u_32_t ftps_seq[2];
u_32_t ftps_len;
int ftps_junk; /* 2 = no cr/lf yet, 1 = cannot parse */
int ftps_cmds;
char ftps_buf[FTP_BUFSZ];
} ftpside_t;
typedef struct ftpinfo {
int ftp_passok;
int ftp_incok;
ftpside_t ftp_side[2];
} ftpinfo_t;
/*
* For the irc proxy.
*/
typedef struct ircinfo {
size_t irc_len;
char *irc_snick;
char *irc_dnick;
char *irc_type;
char *irc_arg;
char *irc_addr;
u_32_t irc_ipnum;
u_short irc_port;
} ircinfo_t;
/*
* Real audio proxy structure and #defines
*/
typedef struct raudio_s {
int rap_seenpna;
int rap_seenver;
int rap_version;
int rap_eos; /* End Of Startup */
int rap_gotid;
int rap_gotlen;
int rap_mode;
int rap_sdone;
u_short rap_plport;
u_short rap_prport;
u_short rap_srport;
char rap_svr[19];
u_32_t rap_sbf; /* flag to indicate which of the 19 bytes have
* been filled
*/
tcp_seq rap_sseq;
} raudio_t;
#define RA_ID_END 0
#define RA_ID_UDP 1
#define RA_ID_ROBUST 7
#define RAP_M_UDP 1
#define RAP_M_ROBUST 2
#define RAP_M_TCP 4
#define RAP_M_UDP_ROBUST (RAP_M_UDP|RAP_M_ROBUST)
/*
* MSN RPC proxy
*/
typedef struct msnrpcinfo {
u_int mri_flags;
int mri_cmd[2];
u_int mri_valid;
struct in_addr mri_raddr;
u_short mri_rport;
} msnrpcinfo_t;
/*
* IPSec proxy
*/
typedef u_32_t ipsec_cookie_t[2];
typedef struct ipsec_pxy {
ipsec_cookie_t ipsc_icookie;
ipsec_cookie_t ipsc_rcookie;
int ipsc_rckset;
ipnat_t ipsc_rule;
nat_t *ipsc_nat;
ipstate_t *ipsc_state;
} ipsec_pxy_t;
/*
* PPTP proxy
*/
typedef struct pptp_side {
u_32_t pptps_nexthdr;
u_32_t pptps_next;
int pptps_state;
int pptps_gothdr;
int pptps_len;
int pptps_bytes;
char *pptps_wptr;
char pptps_buffer[512];
} pptp_side_t;
typedef struct pptp_pxy {
ipnat_t pptp_rule;
nat_t *pptp_nat;
ipstate_t *pptp_state;
u_short pptp_call[2];
pptp_side_t pptp_side[2];
} pptp_pxy_t;
/*
* Sun RPCBIND proxy
*/
#define RPCB_MAXMSG 888
#define RPCB_RES_PMAP 0 /* Response contains a v2 port. */
#define RPCB_RES_STRING 1 /* " " " v3 (GETADDR) string. */
#define RPCB_RES_LIST 2 /* " " " v4 (GETADDRLIST) list. */
#define RPCB_MAXREQS 32 /* Arbitrary limit on tracked transactions */
#define RPCB_REQMIN 40
#define RPCB_REQMAX 888
#define RPCB_REPMIN 20
#define RPCB_REPMAX 604 /* XXX double check this! */
/*
* These macros determine the number of bytes between p and the end of
* r->rs_buf relative to l.
*/
#define RPCB_BUF_END(r) (char *)((r)->rm_msgbuf + (r)->rm_buflen)
#define RPCB_BUF_GEQ(r, p, l) \
((RPCB_BUF_END((r)) > (char *)(p)) && \
((RPCB_BUF_END((r)) - (char *)(p)) >= (l)))
#define RPCB_BUF_EQ(r, p, l) \
(RPCB_BUF_END((r)) == ((char *)(p) + (l)))
/*
* The following correspond to RPC(B) detailed in RFC183[13].
*/
#define RPCB_CALL 0
#define RPCB_REPLY 1
#define RPCB_MSG_VERSION 2
#define RPCB_PROG 100000
#define RPCB_GETPORT 3
#define RPCB_GETADDR 3
#define RPCB_GETADDRLIST 11
#define RPCB_MSG_ACCEPTED 0
#define RPCB_MSG_DENIED 1
/* BEGIN (Generic XDR structures) */
typedef struct xdr_string {
u_32_t *xs_len;
char *xs_str;
} xdr_string_t;
typedef struct xdr_auth {
/* u_32_t xa_flavor; */
xdr_string_t xa_string;
} xdr_auth_t;
typedef struct xdr_uaddr {
u_32_t xu_ip;
u_short xu_port;
xdr_string_t xu_str;
} xdr_uaddr_t;
typedef struct xdr_proto {
u_int xp_proto;
xdr_string_t xp_str;
} xdr_proto_t;
#define xu_xslen xu_str.xs_len
#define xu_xsstr xu_str.xs_str
#define xp_xslen xp_str.xs_len
#define xp_xsstr xp_str.xs_str
/* END (Generic XDR structures) */
/* BEGIN (RPC call structures) */
typedef struct pmap_args {
/* u_32_t pa_prog; */
/* u_32_t pa_vers; */
u_32_t *pa_prot;
/* u_32_t pa_port; */
} pmap_args_t;
typedef struct rpcb_args {
/* u_32_t *ra_prog; */
/* u_32_t *ra_vers; */
xdr_proto_t ra_netid;
xdr_uaddr_t ra_maddr;
/* xdr_string_t ra_owner; */
} rpcb_args_t;
typedef struct rpc_call {
/* u_32_t rc_rpcvers; */
/* u_32_t rc_prog; */
u_32_t *rc_vers;
u_32_t *rc_proc;
xdr_auth_t rc_authcred;
xdr_auth_t rc_authverf;
union {
pmap_args_t ra_pmapargs;
rpcb_args_t ra_rpcbargs;
} rpcb_args;
} rpc_call_t;
#define rc_pmapargs rpcb_args.ra_pmapargs
#define rc_rpcbargs rpcb_args.ra_rpcbargs
/* END (RPC call structures) */
/* BEGIN (RPC reply structures) */
typedef struct rpcb_entry {
xdr_uaddr_t re_maddr;
xdr_proto_t re_netid;
/* u_32_t re_semantics; */
xdr_string_t re_family;
xdr_proto_t re_proto;
u_32_t *re_more; /* 1 == another entry follows */
} rpcb_entry_t;
typedef struct rpcb_listp {
u_32_t *rl_list; /* 1 == list follows */
int rl_cnt;
rpcb_entry_t rl_entries[2]; /* TCP / UDP only */
} rpcb_listp_t;
typedef struct rpc_resp {
/* u_32_t rr_acceptdeny; */
/* Omitted 'message denied' fork; we don't care about rejects. */
xdr_auth_t rr_authverf;
/* u_32_t *rr_astat; */
union {
u_32_t *resp_pmap;
xdr_uaddr_t resp_getaddr;
rpcb_listp_t resp_getaddrlist;
} rpcb_reply;
} rpc_resp_t;
#define rr_v2 rpcb_reply.resp_pmap
#define rr_v3 rpcb_reply.resp_getaddr
#define rr_v4 rpcb_reply.resp_getaddrlist
/* END (RPC reply structures) */
/* BEGIN (RPC message structure & macros) */
typedef struct rpc_msg {
char rm_msgbuf[RPCB_MAXMSG]; /* RPCB data buffer */
u_int rm_buflen;
u_32_t *rm_xid;
/* u_32_t Call vs Reply */
union {
rpc_call_t rb_call;
rpc_resp_t rb_resp;
} rm_body;
} rpc_msg_t;
#define rm_call rm_body.rb_call
#define rm_resp rm_body.rb_resp
/* END (RPC message structure & macros) */
/*
* These code paths aren't hot enough to warrant per transaction
* mutexes.
*/
typedef struct rpcb_xact {
struct rpcb_xact *rx_next;
struct rpcb_xact **rx_pnext;
u_32_t rx_xid; /* RPC transmission ID */
u_int rx_type; /* RPCB response type */
u_int rx_ref; /* reference count */
u_int rx_proto; /* transport protocol (v2 only) */
} rpcb_xact_t;
typedef struct rpcb_session {
ipfmutex_t rs_rxlock;
rpcb_xact_t *rs_rxlist;
} rpcb_session_t;
/*
* For an explanation, please see the following:
* RFC1832 - Sections 3.11, 4.4, and 4.5.
*/
#define XDRALIGN(x) ((((x) % 4) != 0) ? ((((x) + 3) / 4) * 4) : (x))
extern ap_session_t *ap_sess_tab[AP_SESS_SIZE];
extern ap_session_t *ap_sess_list;
extern aproxy_t ap_proxies[];
extern int ippr_ftp_pasvonly;
extern int appr_add __P((aproxy_t *));
extern int appr_ctl __P((ap_ctl_t *));
extern int appr_del __P((aproxy_t *));
extern int appr_init __P((void));
extern void appr_unload __P((void));
extern int appr_ok __P((fr_info_t *, tcphdr_t *, struct ipnat *));
extern int appr_match __P((fr_info_t *, struct nat *));
extern void appr_free __P((aproxy_t *));
extern void aps_free __P((ap_session_t *));
extern int appr_check __P((fr_info_t *, struct nat *));
extern aproxy_t *appr_lookup __P((u_int, char *));
extern int appr_new __P((fr_info_t *, struct nat *));
extern int appr_ioctl __P((caddr_t, ioctlcmd_t, int));
#endif /* _NETINET_IP_PROXY_H_ */
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