795 lines
18 KiB
C
795 lines
18 KiB
C
/* $NetBSD: ip_proxy.c,v 1.38 2004/07/23 05:39:04 martti Exp $ */
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/*
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* Copyright (C) 1997-2003 by Darren Reed.
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*
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* See the IPFILTER.LICENCE file for details on licencing.
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*/
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#if defined(KERNEL) || defined(_KERNEL)
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# undef KERNEL
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# undef _KERNEL
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# define KERNEL 1
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# define _KERNEL 1
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#endif
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#include <sys/errno.h>
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/file.h>
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#include <sys/fcntl.h>
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#if !defined(_KERNEL) && !defined(__KERNEL__)
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# include <stdio.h>
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# include <string.h>
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# include <stdlib.h>
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# include <ctype.h>
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# define _KERNEL
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# ifdef __OpenBSD__
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struct file;
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# endif
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# include <sys/uio.h>
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# undef _KERNEL
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#endif
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#if !defined(linux)
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# include <sys/protosw.h>
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#endif
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#include <sys/socket.h>
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#if defined(_KERNEL)
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# if !defined(__NetBSD__) && !defined(sun) && !defined(__osf__) && \
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!defined(__OpenBSD__) && !defined(__hpux) && !defined(__sgi)
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# include <sys/ctype.h>
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# endif
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# include <sys/systm.h>
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# if !defined(__SVR4) && !defined(__svr4__)
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# include <sys/mbuf.h>
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# endif
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#endif
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#if defined(_KERNEL) && (__FreeBSD_version >= 220000)
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# include <sys/filio.h>
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# include <sys/fcntl.h>
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# if (__FreeBSD_version >= 300000) && !defined(IPFILTER_LKM)
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# include "opt_ipfilter.h"
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# endif
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#else
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# include <sys/ioctl.h>
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#endif
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#if defined(__SVR4) || defined(__svr4__)
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# include <sys/byteorder.h>
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# ifdef _KERNEL
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# include <sys/dditypes.h>
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# endif
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# include <sys/stream.h>
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# include <sys/kmem.h>
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#endif
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#if __FreeBSD__ > 2
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# include <sys/queue.h>
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#endif
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#include <net/if.h>
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#ifdef sun
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# include <net/af.h>
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#endif
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#ifndef linux
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# include <netinet/ip_var.h>
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#endif
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#include <netinet/tcp.h>
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#include <netinet/udp.h>
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#include <netinet/ip_icmp.h>
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#include "netinet/ip_compat.h"
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#include <netinet/tcpip.h>
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#include "netinet/ip_fil.h"
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#include "netinet/ip_nat.h"
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#include "netinet/ip_state.h"
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#include "netinet/ip_proxy.h"
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#if (__FreeBSD_version >= 300000)
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# include <sys/malloc.h>
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#endif
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#include "netinet/ip_ftp_pxy.c"
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#include "netinet/ip_rcmd_pxy.c"
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#if defined(_KERNEL)
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# include "netinet/ip_irc_pxy.c"
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# include "netinet/ip_raudio_pxy.c"
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# include "netinet/ip_h323_pxy.c"
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# include "netinet/ip_pptp_pxy.c"
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# ifdef IPFILTER_PRO
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# include "netinet/ip_msnrpc_pxy.c"
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# endif
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# include "netinet/ip_netbios_pxy.c"
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#endif
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#include "netinet/ip_ipsec_pxy.c"
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#include "netinet/ip_rpcb_pxy.c"
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/* END OF INCLUDES */
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#if !defined(lint)
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static const char rcsid[] = "@(#)Id: ip_proxy.c,v 2.62.2.7 2004/07/11 10:40:54 darrenr Exp";
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#endif
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static int appr_fixseqack __P((fr_info_t *, ip_t *, ap_session_t *, int ));
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#define AP_SESS_SIZE 53
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ap_session_t *ap_sess_tab[AP_SESS_SIZE];
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ap_session_t *ap_sess_list = NULL;
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aproxy_t *ap_proxylist = NULL;
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aproxy_t ap_proxies[] = {
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#ifdef IPF_FTP_PROXY
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{ NULL, "ftp", (char)IPPROTO_TCP, 0, 0, ippr_ftp_init, ippr_ftp_fini,
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ippr_ftp_new, NULL, ippr_ftp_in, ippr_ftp_out, NULL },
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#endif
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#ifdef IPF_IRC_PROXY
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{ NULL, "irc", (char)IPPROTO_TCP, 0, 0, ippr_irc_init, ippr_irc_fini,
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ippr_irc_new, NULL, NULL, ippr_irc_out, NULL, NULL },
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#endif
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#ifdef IPF_RCMD_PROXY
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{ NULL, "rcmd", (char)IPPROTO_TCP, 0, 0, ippr_rcmd_init, ippr_rcmd_fini,
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ippr_rcmd_new, NULL, ippr_rcmd_in, ippr_rcmd_out, NULL, NULL },
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#endif
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#ifdef IPF_RAUDIO_PROXY
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{ NULL, "raudio", (char)IPPROTO_TCP, 0, 0, ippr_raudio_init, ippr_raudio_fini,
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ippr_raudio_new, NULL, ippr_raudio_in, ippr_raudio_out, NULL, NULL },
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#endif
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#ifdef IPF_MSNRPC_PROXY
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{ NULL, "msnrpc", (char)IPPROTO_TCP, 0, 0, ippr_msnrpc_init, ippr_msnrpc_fini,
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ippr_msnrpc_new, NULL, ippr_msnrpc_in, ippr_msnrpc_out, NULL, NULL },
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#endif
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#ifdef IPF_NETBIOS_PROXY
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{ NULL, "netbios", (char)IPPROTO_UDP, 0, 0, ippr_netbios_init, ippr_netbios_fini,
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NULL, NULL, NULL, ippr_netbios_out, NULL, NULL },
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#endif
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#ifdef IPF_IPSEC_PROXY
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{ NULL, "ipsec", (char)IPPROTO_UDP, 0, 0,
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ippr_ipsec_init, ippr_ipsec_fini, ippr_ipsec_new, ippr_ipsec_del,
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ippr_ipsec_inout, ippr_ipsec_inout, ippr_ipsec_match, NULL },
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#endif
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#ifdef IPF_PPTP_PROXY
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{ NULL, "pptp", (char)IPPROTO_TCP, 0, 0,
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ippr_pptp_init, ippr_pptp_fini, ippr_pptp_new, ippr_pptp_del,
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ippr_pptp_inout, ippr_pptp_inout, ippr_pptp_match, NULL },
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#endif
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#ifdef IPF_H323_PROXY
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{ NULL, "h323", (char)IPPROTO_TCP, 0, 0, ippr_h323_init, ippr_h323_fini,
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ippr_h323_new, ippr_h323_del, ippr_h323_in, NULL, NULL },
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{ NULL, "h245", (char)IPPROTO_TCP, 0, 0, NULL, NULL,
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ippr_h245_new, NULL, NULL, ippr_h245_out, NULL },
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#endif
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#ifdef IPF_RPCB_PROXY
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# if 0
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{ NULL, "rpcbt", (char)IPPROTO_TCP, 0, 0,
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ippr_rpcb_init, ippr_rpcb_fini, ippr_rpcb_new, ippr_rpcb_del,
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ippr_rpcb_in, ippr_rpcb_out, NULL, NULL },
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# endif
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{ NULL, "rpcbu", (char)IPPROTO_UDP, 0, 0,
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ippr_rpcb_init, ippr_rpcb_fini, ippr_rpcb_new, ippr_rpcb_del,
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ippr_rpcb_in, ippr_rpcb_out, NULL, NULL },
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#endif
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{ NULL, "", '\0', 0, 0, NULL, NULL, NULL, NULL }
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};
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/*
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* Dynamically add a new kernel proxy. Ensure that it is unique in the
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* collection compiled in and dynamically added.
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*/
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int appr_add(ap)
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aproxy_t *ap;
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{
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aproxy_t *a;
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for (a = ap_proxies; a->apr_p; a++)
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if ((a->apr_p == ap->apr_p) &&
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!strncmp(a->apr_label, ap->apr_label,
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sizeof(ap->apr_label)))
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return -1;
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for (a = ap_proxylist; a->apr_p; a = a->apr_next)
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if ((a->apr_p == ap->apr_p) &&
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!strncmp(a->apr_label, ap->apr_label,
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sizeof(ap->apr_label)))
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return -1;
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ap->apr_next = ap_proxylist;
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ap_proxylist = ap;
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if (ap->apr_init != NULL)
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return (*ap->apr_init)();
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return 0;
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}
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/*
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* Check to see if the proxy this control request has come through for
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* exists, and if it does and it has a control function then invoke that
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* control function.
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*/
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int appr_ctl(ctl)
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ap_ctl_t *ctl;
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{
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aproxy_t *a;
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int error;
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a = appr_lookup(ctl->apc_p, ctl->apc_label);
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if (a == NULL)
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error = ESRCH;
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else if (a->apr_ctl == NULL)
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error = ENXIO;
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else
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error = (*a->apr_ctl)(a, ctl);
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return error;
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}
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/*
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* Delete a proxy that has been added dynamically from those available.
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* If it is in use, return 1 (do not destroy NOW), not in use 0 or -1
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* if it cannot be matched.
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*/
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int appr_del(ap)
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aproxy_t *ap;
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{
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aproxy_t *a, **app;
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for (app = &ap_proxylist; ((a = *app) != NULL); app = &a->apr_next)
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if (a == ap) {
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a->apr_flags |= APR_DELETE;
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*app = a->apr_next;
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if (ap->apr_ref != 0)
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return 1;
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return 0;
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}
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return -1;
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}
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/*
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* Return 1 if the packet is a good match against a proxy, else 0.
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*/
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int appr_ok(fin, tcp, nat)
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fr_info_t *fin;
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tcphdr_t *tcp;
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ipnat_t *nat;
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{
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aproxy_t *apr = nat->in_apr;
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u_short dport = nat->in_dport;
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if ((apr == NULL) || (apr->apr_flags & APR_DELETE) ||
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(fin->fin_p != apr->apr_p))
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return 0;
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if ((tcp == NULL) && dport)
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return 0;
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return 1;
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}
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int appr_ioctl(data, cmd, mode)
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caddr_t data;
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ioctlcmd_t cmd;
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int mode;
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{
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ap_ctl_t ctl;
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caddr_t ptr;
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int error;
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mode = mode; /* LINT */
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switch (cmd)
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{
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case SIOCPROXY :
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BCOPYIN(data, &ctl, sizeof(ctl));
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ptr = NULL;
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if (ctl.apc_dsize > 0) {
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KMALLOCS(ptr, caddr_t, ctl.apc_dsize);
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if (ptr == NULL)
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error = ENOMEM;
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else {
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error = copyinptr(ctl.apc_data, ptr,
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ctl.apc_dsize);
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if (error == 0)
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ctl.apc_data = ptr;
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}
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} else {
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ctl.apc_data = NULL;
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error = 0;
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}
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if (error == 0)
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error = appr_ctl(&ctl);
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if (ctl.apc_dsize > 0 && ptr != NULL && ctl.apc_data == ptr) {
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KFREES(ptr, ctl.apc_dsize);
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}
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break;
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default :
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error = EINVAL;
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}
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return error;
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}
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/*
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* If a proxy has a match function, call that to do extended packet
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* matching.
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*/
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int appr_match(fin, nat)
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fr_info_t *fin;
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nat_t *nat;
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{
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aproxy_t *apr;
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ipnat_t *ipn;
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#if PROXY_DEBUG
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printf("appr_match(%lx,%lx)\n", fin, nat);
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#endif
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if ((fin->fin_flx & (FI_SHORT|FI_BAD)) != 0)
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return -1;
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ipn = nat->nat_ptr;
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if (ipn == NULL)
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return -1;
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apr = ipn->in_apr;
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if ((apr == NULL) || (apr->apr_flags & APR_DELETE) ||
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(nat->nat_aps == NULL))
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return -1;
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if (apr->apr_match != NULL)
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if ((*apr->apr_match)(fin, nat->nat_aps, nat) != 0)
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return -1;
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return 0;
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}
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/*
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* Allocate a new application proxy structure and fill it in with the
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* relevant details. call the init function once complete, prior to
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* returning.
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*/
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int appr_new(fin, nat)
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fr_info_t *fin;
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nat_t *nat;
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{
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register ap_session_t *aps;
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aproxy_t *apr;
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#if PROXY_DEBUG
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printf("appr_new(%lx,%lx)\n", fin, nat);
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#endif
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if ((nat->nat_ptr == NULL) || (nat->nat_aps != NULL))
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return -1;
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apr = nat->nat_ptr->in_apr;
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if (!apr || (apr->apr_flags & APR_DELETE) ||
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(fin->fin_p != apr->apr_p))
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return -1;
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KMALLOC(aps, ap_session_t *);
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if (!aps)
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return -1;
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bzero((char *)aps, sizeof(*aps));
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aps->aps_p = fin->fin_p;
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aps->aps_data = NULL;
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aps->aps_apr = apr;
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aps->aps_psiz = 0;
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if (apr->apr_new != NULL)
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if ((*apr->apr_new)(fin, aps, nat) == -1) {
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if ((aps->aps_data != NULL) && (aps->aps_psiz != 0)) {
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KFREES(aps->aps_data, aps->aps_psiz);
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}
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KFREE(aps);
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return -1;
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}
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aps->aps_nat = nat;
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aps->aps_next = ap_sess_list;
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ap_sess_list = aps;
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nat->nat_aps = aps;
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return 0;
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}
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/*
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* Check to see if a packet should be passed through an active proxy routine
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* if one has been setup for it. We don't need to check the checksum here if
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* IPFILTER_CKSUM is defined because if it is, a failed check causes FI_BAD
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* to be set.
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*/
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int appr_check(fin, nat)
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fr_info_t *fin;
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nat_t *nat;
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{
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#if SOLARIS && defined(_KERNEL) && (SOLARIS2 >= 6)
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# if defined(ICK_VALID)
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mb_t *m;
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# endif
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int dosum = 1;
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#endif
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tcphdr_t *tcp = NULL;
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udphdr_t *udp = NULL;
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ap_session_t *aps;
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aproxy_t *apr;
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ip_t *ip;
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short rv;
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int err;
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#if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi)
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u_32_t s1, s2, sd;
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#endif
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if (fin->fin_flx & FI_BAD)
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return -1;
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#ifndef IPFILTER_CKSUM
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if ((fin->fin_out == 0) && (fr_checkl4sum(fin) == -1)) {
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# if PROXY_DEBUG || !defined(_KERNEL)
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printf("proxy l4 checksum failure on %p\n", fin);
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# endif
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if (fin->fin_p == IPPROTO_TCP)
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frstats[fin->fin_out].fr_tcpbad++;
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return -1;
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}
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#endif
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aps = nat->nat_aps;
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if ((aps != NULL) && (aps->aps_p == fin->fin_p)) {
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/*
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* If there is data in this packet to be proxied then try and
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* get it all into the one buffer, else drop it.
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*/
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#if defined(MENTAT) || defined(HAVE_M_PULLDOWN)
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if ((fin->fin_dlen > 0) && !(fin->fin_flx & FI_COALESCE))
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if (fr_coalesce(fin) == -1)
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return -1;
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#endif
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ip = fin->fin_ip;
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switch (fin->fin_p)
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{
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case IPPROTO_TCP :
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tcp = (tcphdr_t *)fin->fin_dp;
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#if SOLARIS && defined(_KERNEL) && (SOLARIS2 >= 6) && defined(ICK_VALID)
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m = fin->fin_qfm;
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if (dohwcksum && (m->b_ick_flag == ICK_VALID))
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dosum = 0;
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#endif
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/*
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* Don't bother the proxy with these...or in fact,
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* should we free up proxy stuff when seen?
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*/
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if ((fin->fin_tcpf & TH_RST) != 0)
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break;
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/*FALLTHROUGH*/
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case IPPROTO_UDP :
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udp = (udphdr_t *)fin->fin_dp;
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break;
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default :
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break;
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}
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apr = aps->aps_apr;
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err = 0;
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if (fin->fin_out != 0) {
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if (apr->apr_outpkt != NULL)
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err = (*apr->apr_outpkt)(fin, aps, nat);
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} else {
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if (apr->apr_inpkt != NULL)
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err = (*apr->apr_inpkt)(fin, aps, nat);
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}
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rv = APR_EXIT(err);
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if (rv == 1) {
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#if PROXY_DEBUG || !defined(_KERNEL)
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printf("%d:proxy says bad packet received (%x)\n",
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fin->fin_out, err);
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#endif
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return -1;
|
|
}
|
|
if (rv == 2) {
|
|
#if PROXY_DEBUG || !defined(_KERNEL)
|
|
printf("proxy says free app proxy data (%x)\n", err);
|
|
#endif
|
|
appr_free(apr);
|
|
nat->nat_aps = NULL;
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* If err != 0 then the data size of the packet has changed
|
|
* so we need to recalculate the header checksums for the
|
|
* packet.
|
|
*/
|
|
#if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi)
|
|
if (err != 0) {
|
|
short adjlen = err & 0xffff;
|
|
|
|
s1 = LONG_SUM(ip->ip_len - adjlen);
|
|
s2 = LONG_SUM(ip->ip_len);
|
|
CALC_SUMD(s1, s2, sd);
|
|
fix_outcksum(fin, &ip->ip_sum, sd);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* For TCP packets, we may need to adjust the sequence and
|
|
* acknowledgement numbers to reflect changes in size of the
|
|
* data stream.
|
|
*
|
|
* For both TCP and UDP, recalculate the layer 4 checksum,
|
|
* regardless, as we can't tell (here) if data has been
|
|
* changed or not.
|
|
*/
|
|
if (tcp != NULL) {
|
|
err = appr_fixseqack(fin, ip, aps, APR_INC(err));
|
|
#if SOLARIS && defined(_KERNEL) && (SOLARIS2 >= 6)
|
|
if (dosum)
|
|
tcp->th_sum = fr_cksum(fin->fin_qfm, ip,
|
|
IPPROTO_TCP, tcp);
|
|
#else
|
|
tcp->th_sum = fr_cksum(fin->fin_m, ip,
|
|
IPPROTO_TCP, tcp);
|
|
#endif
|
|
} else if ((udp != NULL) && (udp->uh_sum != 0)) {
|
|
#if SOLARIS && defined(_KERNEL) && (SOLARIS2 >= 6)
|
|
if (dosum)
|
|
udp->uh_sum = fr_cksum(fin->fin_qfm, ip,
|
|
IPPROTO_UDP, udp);
|
|
#else
|
|
udp->uh_sum = fr_cksum(fin->fin_m, ip,
|
|
IPPROTO_UDP, udp);
|
|
#endif
|
|
}
|
|
aps->aps_bytes += fin->fin_plen;
|
|
aps->aps_pkts++;
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* Search for an proxy by the protocol it is being used with and its name.
|
|
*/
|
|
aproxy_t *appr_lookup(pr, name)
|
|
u_int pr;
|
|
char *name;
|
|
{
|
|
aproxy_t *ap;
|
|
|
|
#if PROXY_DEBUG
|
|
printf("appr_lookup(%d,%s)\n", pr, name);
|
|
#endif
|
|
|
|
for (ap = ap_proxies; ap->apr_p; ap++)
|
|
if ((ap->apr_p == pr) &&
|
|
!strncmp(name, ap->apr_label, sizeof(ap->apr_label))) {
|
|
ap->apr_ref++;
|
|
return ap;
|
|
}
|
|
|
|
for (ap = ap_proxylist; ap; ap = ap->apr_next)
|
|
if ((ap->apr_p == pr) &&
|
|
!strncmp(name, ap->apr_label, sizeof(ap->apr_label))) {
|
|
ap->apr_ref++;
|
|
return ap;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
|
|
void appr_free(ap)
|
|
aproxy_t *ap;
|
|
{
|
|
ap->apr_ref--;
|
|
}
|
|
|
|
|
|
void aps_free(aps)
|
|
ap_session_t *aps;
|
|
{
|
|
ap_session_t *a, **ap;
|
|
aproxy_t *apr;
|
|
|
|
if (!aps)
|
|
return;
|
|
|
|
for (ap = &ap_sess_list; ((a = *ap) != NULL); ap = &a->aps_next)
|
|
if (a == aps) {
|
|
*ap = a->aps_next;
|
|
break;
|
|
}
|
|
|
|
apr = aps->aps_apr;
|
|
if ((apr != NULL) && (apr->apr_del != NULL))
|
|
(*apr->apr_del)(aps);
|
|
|
|
if ((aps->aps_data != NULL) && (aps->aps_psiz != 0))
|
|
KFREES(aps->aps_data, aps->aps_psiz);
|
|
KFREE(aps);
|
|
}
|
|
|
|
|
|
/*
|
|
* returns 2 if ack or seq number in TCP header is changed, returns 0 otherwise
|
|
*/
|
|
static int appr_fixseqack(fin, ip, aps, inc)
|
|
fr_info_t *fin;
|
|
ip_t *ip;
|
|
ap_session_t *aps;
|
|
int inc;
|
|
{
|
|
int sel, ch = 0, out, nlen;
|
|
u_32_t seq1, seq2;
|
|
tcphdr_t *tcp;
|
|
short inc2;
|
|
|
|
tcp = (tcphdr_t *)fin->fin_dp;
|
|
out = fin->fin_out;
|
|
/*
|
|
* ip_len has already been adjusted by 'inc'.
|
|
*/
|
|
nlen = ip->ip_len;
|
|
nlen -= (IP_HL(ip) << 2) + (TCP_OFF(tcp) << 2);
|
|
|
|
inc2 = inc;
|
|
inc = (int)inc2;
|
|
|
|
if (out != 0) {
|
|
seq1 = (u_32_t)ntohl(tcp->th_seq);
|
|
sel = aps->aps_sel[out];
|
|
|
|
/* switch to other set ? */
|
|
if ((aps->aps_seqmin[!sel] > aps->aps_seqmin[sel]) &&
|
|
(seq1 > aps->aps_seqmin[!sel])) {
|
|
#if PROXY_DEBUG
|
|
printf("proxy out switch set seq %d -> %d %x > %x\n",
|
|
sel, !sel, seq1, aps->aps_seqmin[!sel]);
|
|
#endif
|
|
sel = aps->aps_sel[out] = !sel;
|
|
}
|
|
|
|
if (aps->aps_seqoff[sel]) {
|
|
seq2 = aps->aps_seqmin[sel] - aps->aps_seqoff[sel];
|
|
if (seq1 > seq2) {
|
|
seq2 = aps->aps_seqoff[sel];
|
|
seq1 += seq2;
|
|
tcp->th_seq = htonl(seq1);
|
|
ch = 1;
|
|
}
|
|
}
|
|
|
|
if (inc && (seq1 > aps->aps_seqmin[!sel])) {
|
|
aps->aps_seqmin[sel] = seq1 + nlen - 1;
|
|
aps->aps_seqoff[sel] = aps->aps_seqoff[sel] + inc;
|
|
#if PROXY_DEBUG
|
|
printf("proxy seq set %d at %x to %d + %d\n", sel,
|
|
aps->aps_seqmin[sel], aps->aps_seqoff[sel],
|
|
inc);
|
|
#endif
|
|
}
|
|
|
|
/***/
|
|
|
|
seq1 = ntohl(tcp->th_ack);
|
|
sel = aps->aps_sel[1 - out];
|
|
|
|
/* switch to other set ? */
|
|
if ((aps->aps_ackmin[!sel] > aps->aps_ackmin[sel]) &&
|
|
(seq1 > aps->aps_ackmin[!sel])) {
|
|
#if PROXY_DEBUG
|
|
printf("proxy out switch set ack %d -> %d %x > %x\n",
|
|
sel, !sel, seq1, aps->aps_ackmin[!sel]);
|
|
#endif
|
|
sel = aps->aps_sel[1 - out] = !sel;
|
|
}
|
|
|
|
if (aps->aps_ackoff[sel] && (seq1 > aps->aps_ackmin[sel])) {
|
|
seq2 = aps->aps_ackoff[sel];
|
|
tcp->th_ack = htonl(seq1 - seq2);
|
|
ch = 1;
|
|
}
|
|
} else {
|
|
seq1 = ntohl(tcp->th_seq);
|
|
sel = aps->aps_sel[out];
|
|
|
|
/* switch to other set ? */
|
|
if ((aps->aps_ackmin[!sel] > aps->aps_ackmin[sel]) &&
|
|
(seq1 > aps->aps_ackmin[!sel])) {
|
|
#if PROXY_DEBUG
|
|
printf("proxy in switch set ack %d -> %d %x > %x\n",
|
|
sel, !sel, seq1, aps->aps_ackmin[!sel]);
|
|
#endif
|
|
sel = aps->aps_sel[out] = !sel;
|
|
}
|
|
|
|
if (aps->aps_ackoff[sel]) {
|
|
seq2 = aps->aps_ackmin[sel] - aps->aps_ackoff[sel];
|
|
if (seq1 > seq2) {
|
|
seq2 = aps->aps_ackoff[sel];
|
|
seq1 += seq2;
|
|
tcp->th_seq = htonl(seq1);
|
|
ch = 1;
|
|
}
|
|
}
|
|
|
|
if (inc && (seq1 > aps->aps_ackmin[!sel])) {
|
|
aps->aps_ackmin[!sel] = seq1 + nlen - 1;
|
|
aps->aps_ackoff[!sel] = aps->aps_ackoff[sel] + inc;
|
|
#if PROXY_DEBUG
|
|
printf("proxy ack set %d at %x to %d + %d\n", !sel,
|
|
aps->aps_seqmin[!sel], aps->aps_seqoff[sel],
|
|
inc);
|
|
#endif
|
|
}
|
|
|
|
/***/
|
|
|
|
seq1 = ntohl(tcp->th_ack);
|
|
sel = aps->aps_sel[1 - out];
|
|
|
|
/* switch to other set ? */
|
|
if ((aps->aps_seqmin[!sel] > aps->aps_seqmin[sel]) &&
|
|
(seq1 > aps->aps_seqmin[!sel])) {
|
|
#if PROXY_DEBUG
|
|
printf("proxy in switch set seq %d -> %d %x > %x\n",
|
|
sel, !sel, seq1, aps->aps_seqmin[!sel]);
|
|
#endif
|
|
sel = aps->aps_sel[1 - out] = !sel;
|
|
}
|
|
|
|
if (aps->aps_seqoff[sel] != 0) {
|
|
#if PROXY_DEBUG
|
|
printf("sel %d seqoff %d seq1 %x seqmin %x\n", sel,
|
|
aps->aps_seqoff[sel], seq1,
|
|
aps->aps_seqmin[sel]);
|
|
#endif
|
|
if (seq1 > aps->aps_seqmin[sel]) {
|
|
seq2 = aps->aps_seqoff[sel];
|
|
tcp->th_ack = htonl(seq1 - seq2);
|
|
ch = 1;
|
|
}
|
|
}
|
|
}
|
|
#if PROXY_DEBUG
|
|
printf("appr_fixseqack: seq %lx ack %lx\n", ntohl(tcp->th_seq),
|
|
ntohl(tcp->th_ack));
|
|
#endif
|
|
return ch ? 2 : 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* Initialise hook for kernel application proxies.
|
|
* Call the initialise routine for all the compiled in kernel proxies.
|
|
*/
|
|
int appr_init()
|
|
{
|
|
aproxy_t *ap;
|
|
int err = 0;
|
|
|
|
for (ap = ap_proxies; ap->apr_p; ap++) {
|
|
if (ap->apr_init != NULL) {
|
|
err = (*ap->apr_init)();
|
|
if (err != 0)
|
|
break;
|
|
}
|
|
}
|
|
return err;
|
|
}
|
|
|
|
|
|
/*
|
|
* Unload hook for kernel application proxies.
|
|
* Call the finialise routine for all the compiled in kernel proxies.
|
|
*/
|
|
void appr_unload()
|
|
{
|
|
aproxy_t *ap;
|
|
|
|
for (ap = ap_proxies; ap->apr_p; ap++)
|
|
if (ap->apr_fini != NULL)
|
|
(*ap->apr_fini)();
|
|
for (ap = ap_proxylist; ap; ap = ap->apr_next)
|
|
if (ap->apr_fini != NULL)
|
|
(*ap->apr_fini)();
|
|
}
|