diff options
Diffstat (limited to 'contrib/ipfilter/ip_proxy.c')
| -rw-r--r-- | contrib/ipfilter/ip_proxy.c | 854 |
1 files changed, 0 insertions, 854 deletions
diff --git a/contrib/ipfilter/ip_proxy.c b/contrib/ipfilter/ip_proxy.c deleted file mode 100644 index 18bc4e1..0000000 --- a/contrib/ipfilter/ip_proxy.c +++ /dev/null @@ -1,854 +0,0 @@ -/* $NetBSD$ */ - -/* - * Copyright (C) 1997-2003 by Darren Reed. - * - * See the IPFILTER.LICENCE file for details on licencing. - */ -#if defined(KERNEL) || defined(_KERNEL) -# undef KERNEL -# undef _KERNEL -# define KERNEL 1 -# define _KERNEL 1 -#endif -#include <sys/errno.h> -#include <sys/types.h> -#include <sys/param.h> -#include <sys/time.h> -#include <sys/file.h> -#include <sys/fcntl.h> -#if !defined(_KERNEL) && !defined(__KERNEL__) -# include <stdio.h> -# include <string.h> -# include <stdlib.h> -# include <ctype.h> -# define _KERNEL -# ifdef __OpenBSD__ -struct file; -# endif -# include <sys/uio.h> -# undef _KERNEL -#endif -#if !defined(linux) -# include <sys/protosw.h> -#endif -#include <sys/socket.h> -#if defined(_KERNEL) -# if !defined(__NetBSD__) && !defined(sun) && !defined(__osf__) && \ - !defined(__OpenBSD__) && !defined(__hpux) && !defined(__sgi) -# include <sys/ctype.h> -# endif -# include <sys/systm.h> -# if !defined(__SVR4) && !defined(__svr4__) -# include <sys/mbuf.h> -# endif -#endif -#if defined(_KERNEL) && (__FreeBSD_version >= 220000) -# include <sys/filio.h> -# include <sys/fcntl.h> -# if (__FreeBSD_version >= 300000) && !defined(IPFILTER_LKM) -# include "opt_ipfilter.h" -# endif -#else -# include <sys/ioctl.h> -#endif -#if defined(__SVR4) || defined(__svr4__) -# include <sys/byteorder.h> -# ifdef _KERNEL -# include <sys/dditypes.h> -# endif -# include <sys/stream.h> -# include <sys/kmem.h> -#endif -#if __FreeBSD__ > 2 -# include <sys/queue.h> -#endif -#include <net/if.h> -#ifdef sun -# include <net/af.h> -#endif -#include <net/route.h> -#include <netinet/in.h> -#include <netinet/in_systm.h> -#include <netinet/ip.h> -#ifndef linux -# include <netinet/ip_var.h> -#endif -#include <netinet/tcp.h> -#include <netinet/udp.h> -#include <netinet/ip_icmp.h> -#include "netinet/ip_compat.h" -#include <netinet/tcpip.h> -#include "netinet/ip_fil.h" -#include "netinet/ip_nat.h" -#include "netinet/ip_state.h" -#include "netinet/ip_proxy.h" -#if (__FreeBSD_version >= 300000) -# include <sys/malloc.h> -#endif - -#include "netinet/ip_ftp_pxy.c" -#include "netinet/ip_rcmd_pxy.c" -# include "netinet/ip_pptp_pxy.c" -#if defined(_KERNEL) -# include "netinet/ip_irc_pxy.c" -# include "netinet/ip_raudio_pxy.c" -# include "netinet/ip_h323_pxy.c" -# ifdef IPFILTER_PRO -# include "netinet/ip_msnrpc_pxy.c" -# endif -# include "netinet/ip_netbios_pxy.c" -#endif -#include "netinet/ip_ipsec_pxy.c" -#include "netinet/ip_rpcb_pxy.c" - -/* END OF INCLUDES */ - -#if !defined(lint) -static const char rcsid[] = "@(#)Id: ip_proxy.c,v 2.62.2.12 2005/03/03 14:28:24 darrenr Exp"; -#endif - -static int appr_fixseqack __P((fr_info_t *, ip_t *, ap_session_t *, int )); - -#define AP_SESS_SIZE 53 - -#if defined(_KERNEL) -int ipf_proxy_debug = 0; -#else -int ipf_proxy_debug = 2; -#endif -ap_session_t *ap_sess_tab[AP_SESS_SIZE]; -ap_session_t *ap_sess_list = NULL; -aproxy_t *ap_proxylist = NULL; -aproxy_t ap_proxies[] = { -#ifdef IPF_FTP_PROXY - { NULL, "ftp", (char)IPPROTO_TCP, 0, 0, ippr_ftp_init, ippr_ftp_fini, - ippr_ftp_new, NULL, ippr_ftp_in, ippr_ftp_out, NULL }, -#endif -#ifdef IPF_IRC_PROXY - { NULL, "irc", (char)IPPROTO_TCP, 0, 0, ippr_irc_init, ippr_irc_fini, - ippr_irc_new, NULL, NULL, ippr_irc_out, NULL, NULL }, -#endif -#ifdef IPF_RCMD_PROXY - { NULL, "rcmd", (char)IPPROTO_TCP, 0, 0, ippr_rcmd_init, ippr_rcmd_fini, - ippr_rcmd_new, NULL, ippr_rcmd_in, ippr_rcmd_out, NULL, NULL }, -#endif -#ifdef IPF_RAUDIO_PROXY - { NULL, "raudio", (char)IPPROTO_TCP, 0, 0, ippr_raudio_init, ippr_raudio_fini, - ippr_raudio_new, NULL, ippr_raudio_in, ippr_raudio_out, NULL, NULL }, -#endif -#ifdef IPF_MSNRPC_PROXY - { NULL, "msnrpc", (char)IPPROTO_TCP, 0, 0, ippr_msnrpc_init, ippr_msnrpc_fini, - ippr_msnrpc_new, NULL, ippr_msnrpc_in, ippr_msnrpc_out, NULL, NULL }, -#endif -#ifdef IPF_NETBIOS_PROXY - { NULL, "netbios", (char)IPPROTO_UDP, 0, 0, ippr_netbios_init, ippr_netbios_fini, - NULL, NULL, NULL, ippr_netbios_out, NULL, NULL }, -#endif -#ifdef IPF_IPSEC_PROXY - { NULL, "ipsec", (char)IPPROTO_UDP, 0, 0, - ippr_ipsec_init, ippr_ipsec_fini, ippr_ipsec_new, ippr_ipsec_del, - ippr_ipsec_inout, ippr_ipsec_inout, ippr_ipsec_match, NULL }, -#endif -#ifdef IPF_PPTP_PROXY - { NULL, "pptp", (char)IPPROTO_TCP, 0, 0, - ippr_pptp_init, ippr_pptp_fini, ippr_pptp_new, ippr_pptp_del, - ippr_pptp_inout, ippr_pptp_inout, NULL, NULL }, -#endif -#ifdef IPF_H323_PROXY - { NULL, "h323", (char)IPPROTO_TCP, 0, 0, ippr_h323_init, ippr_h323_fini, - ippr_h323_new, ippr_h323_del, ippr_h323_in, NULL, NULL }, - { NULL, "h245", (char)IPPROTO_TCP, 0, 0, NULL, NULL, - ippr_h245_new, NULL, NULL, ippr_h245_out, NULL }, -#endif -#ifdef IPF_RPCB_PROXY -# if 0 - { NULL, "rpcbt", (char)IPPROTO_TCP, 0, 0, - ippr_rpcb_init, ippr_rpcb_fini, ippr_rpcb_new, ippr_rpcb_del, - ippr_rpcb_in, ippr_rpcb_out, NULL, NULL }, -# endif - { NULL, "rpcbu", (char)IPPROTO_UDP, 0, 0, - ippr_rpcb_init, ippr_rpcb_fini, ippr_rpcb_new, ippr_rpcb_del, - ippr_rpcb_in, ippr_rpcb_out, NULL, NULL }, -#endif - { NULL, "", '\0', 0, 0, NULL, NULL, NULL, NULL } -}; - -/* - * Dynamically add a new kernel proxy. Ensure that it is unique in the - * collection compiled in and dynamically added. - */ -int appr_add(ap) -aproxy_t *ap; -{ - aproxy_t *a; - - for (a = ap_proxies; a->apr_p; a++) - if ((a->apr_p == ap->apr_p) && - !strncmp(a->apr_label, ap->apr_label, - sizeof(ap->apr_label))) { - if (ipf_proxy_debug > 1) - printf("appr_add: %s/%d already present (B)\n", - a->apr_label, a->apr_p); - return -1; - } - - for (a = ap_proxylist; a->apr_p; a = a->apr_next) - if ((a->apr_p == ap->apr_p) && - !strncmp(a->apr_label, ap->apr_label, - sizeof(ap->apr_label))) { - if (ipf_proxy_debug > 1) - printf("appr_add: %s/%d already present (D)\n", - a->apr_label, a->apr_p); - return -1; - } - ap->apr_next = ap_proxylist; - ap_proxylist = ap; - if (ap->apr_init != NULL) - return (*ap->apr_init)(); - return 0; -} - - -/* - * Check to see if the proxy this control request has come through for - * exists, and if it does and it has a control function then invoke that - * control function. - */ -int appr_ctl(ctl) -ap_ctl_t *ctl; -{ - aproxy_t *a; - int error; - - a = appr_lookup(ctl->apc_p, ctl->apc_label); - if (a == NULL) { - if (ipf_proxy_debug > 1) - printf("appr_ctl: can't find %s/%d\n", - ctl->apc_label, ctl->apc_p); - error = ESRCH; - } else if (a->apr_ctl == NULL) { - if (ipf_proxy_debug > 1) - printf("appr_ctl: no ctl function for %s/%d\n", - ctl->apc_label, ctl->apc_p); - error = ENXIO; - } else { - error = (*a->apr_ctl)(a, ctl); - if ((error != 0) && (ipf_proxy_debug > 1)) - printf("appr_ctl: %s/%d ctl error %d\n", - a->apr_label, a->apr_p, error); - } - return error; -} - - -/* - * Delete a proxy that has been added dynamically from those available. - * If it is in use, return 1 (do not destroy NOW), not in use 0 or -1 - * if it cannot be matched. - */ -int appr_del(ap) -aproxy_t *ap; -{ - aproxy_t *a, **app; - - for (app = &ap_proxylist; ((a = *app) != NULL); app = &a->apr_next) - if (a == ap) { - a->apr_flags |= APR_DELETE; - *app = a->apr_next; - if (ap->apr_ref != 0) { - if (ipf_proxy_debug > 2) - printf("appr_del: orphaning %s/%d\n", - ap->apr_label, ap->apr_p); - return 1; - } - return 0; - } - if (ipf_proxy_debug > 1) - printf("appr_del: proxy %lx not found\n", (u_long)ap); - return -1; -} - - -/* - * Return 1 if the packet is a good match against a proxy, else 0. - */ -int appr_ok(fin, tcp, nat) -fr_info_t *fin; -tcphdr_t *tcp; -ipnat_t *nat; -{ - aproxy_t *apr = nat->in_apr; - u_short dport = nat->in_dport; - - if ((apr == NULL) || (apr->apr_flags & APR_DELETE) || - (fin->fin_p != apr->apr_p)) - return 0; - if ((tcp == NULL) && dport) - return 0; - return 1; -} - - -int appr_ioctl(data, cmd, mode) -caddr_t data; -ioctlcmd_t cmd; -int mode; -{ - ap_ctl_t ctl; - caddr_t ptr; - int error; - - mode = mode; /* LINT */ - - switch (cmd) - { - case SIOCPROXY : - BCOPYIN(data, &ctl, sizeof(ctl)); - ptr = NULL; - - if (ctl.apc_dsize > 0) { - KMALLOCS(ptr, caddr_t, ctl.apc_dsize); - if (ptr == NULL) - error = ENOMEM; - else { - error = copyinptr(ctl.apc_data, ptr, - ctl.apc_dsize); - if (error == 0) - ctl.apc_data = ptr; - } - } else { - ctl.apc_data = NULL; - error = 0; - } - - if (error == 0) - error = appr_ctl(&ctl); - - if ((ctl.apc_dsize > 0) && (ptr != NULL) && - (ctl.apc_data == ptr)) { - KFREES(ptr, ctl.apc_dsize); - } - break; - - default : - error = EINVAL; - } - return error; -} - - -/* - * If a proxy has a match function, call that to do extended packet - * matching. - */ -int appr_match(fin, nat) -fr_info_t *fin; -nat_t *nat; -{ - aproxy_t *apr; - ipnat_t *ipn; - int result; - - ipn = nat->nat_ptr; - if (ipf_proxy_debug > 8) - printf("appr_match(%lx,%lx) aps %lx ptr %lx\n", - (u_long)fin, (u_long)nat, (u_long)nat->nat_aps, - (u_long)ipn); - - if ((fin->fin_flx & (FI_SHORT|FI_BAD)) != 0) { - if (ipf_proxy_debug > 0) - printf("appr_match: flx 0x%x (BAD|SHORT)\n", - fin->fin_flx); - return -1; - } - - apr = ipn->in_apr; - if ((apr == NULL) || (apr->apr_flags & APR_DELETE)) { - if (ipf_proxy_debug > 0) - printf("appr_match:apr %lx apr_flags 0x%x\n", - (u_long)apr, apr ? apr->apr_flags : 0); - return -1; - } - - if (apr->apr_match != NULL) { - result = (*apr->apr_match)(fin, nat->nat_aps, nat); - if (result != 0) { - if (ipf_proxy_debug > 4) - printf("appr_match: result %d\n", result); - return -1; - } - } - return 0; -} - - -/* - * Allocate a new application proxy structure and fill it in with the - * relevant details. call the init function once complete, prior to - * returning. - */ -int appr_new(fin, nat) -fr_info_t *fin; -nat_t *nat; -{ - register ap_session_t *aps; - aproxy_t *apr; - - if (ipf_proxy_debug > 8) - printf("appr_new(%lx,%lx) \n", (u_long)fin, (u_long)nat); - - if ((nat->nat_ptr == NULL) || (nat->nat_aps != NULL)) { - if (ipf_proxy_debug > 0) - printf("appr_new: nat_ptr %lx nat_aps %lx\n", - (u_long)nat->nat_ptr, (u_long)nat->nat_aps); - return -1; - } - - apr = nat->nat_ptr->in_apr; - - if ((apr->apr_flags & APR_DELETE) || - (fin->fin_p != apr->apr_p)) { - if (ipf_proxy_debug > 2) - printf("appr_new: apr_flags 0x%x p %d/%d\n", - apr->apr_flags, fin->fin_p, apr->apr_p); - return -1; - } - - KMALLOC(aps, ap_session_t *); - if (!aps) { - if (ipf_proxy_debug > 0) - printf("appr_new: malloc failed (%lu)\n", - (u_long)sizeof(ap_session_t)); - return -1; - } - - bzero((char *)aps, sizeof(*aps)); - aps->aps_p = fin->fin_p; - aps->aps_data = NULL; - aps->aps_apr = apr; - aps->aps_psiz = 0; - if (apr->apr_new != NULL) - if ((*apr->apr_new)(fin, aps, nat) == -1) { - if ((aps->aps_data != NULL) && (aps->aps_psiz != 0)) { - KFREES(aps->aps_data, aps->aps_psiz); - } - KFREE(aps); - if (ipf_proxy_debug > 2) - printf("appr_new: new(%lx) failed\n", - (u_long)apr->apr_new); - return -1; - } - aps->aps_nat = nat; - aps->aps_next = ap_sess_list; - ap_sess_list = aps; - nat->nat_aps = aps; - - return 0; -} - - -/* - * Check to see if a packet should be passed through an active proxy routine - * if one has been setup for it. We don't need to check the checksum here if - * IPFILTER_CKSUM is defined because if it is, a failed check causes FI_BAD - * to be set. - */ -int appr_check(fin, nat) -fr_info_t *fin; -nat_t *nat; -{ -#if SOLARIS && defined(_KERNEL) && (SOLARIS2 >= 6) -# if defined(ICK_VALID) - mb_t *m; -# endif - int dosum = 1; -#endif - tcphdr_t *tcp = NULL; - udphdr_t *udp = NULL; - ap_session_t *aps; - aproxy_t *apr; - ip_t *ip; - short rv; - int err; -#if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi) - u_32_t s1, s2, sd; -#endif - - if (fin->fin_flx & FI_BAD) { - if (ipf_proxy_debug > 0) - printf("appr_check: flx 0x%x (BAD)\n", fin->fin_flx); - return -1; - } - -#ifndef IPFILTER_CKSUM - if ((fin->fin_out == 0) && (fr_checkl4sum(fin) == -1)) { - if (ipf_proxy_debug > 0) - printf("appr_check: l4 checksum failure %d\n", - fin->fin_p); - if (fin->fin_p == IPPROTO_TCP) - frstats[fin->fin_out].fr_tcpbad++; - return -1; - } -#endif - - aps = nat->nat_aps; - if ((aps != NULL) && (aps->aps_p == fin->fin_p)) { - /* - * If there is data in this packet to be proxied then try and - * get it all into the one buffer, else drop it. - */ -#if defined(MENTAT) || defined(HAVE_M_PULLDOWN) - if ((fin->fin_dlen > 0) && !(fin->fin_flx & FI_COALESCE)) - if (fr_coalesce(fin) == -1) { - if (ipf_proxy_debug > 0) - printf("appr_check: fr_coalesce failed %x\n", fin->fin_flx); - return -1; - } -#endif - ip = fin->fin_ip; - - switch (fin->fin_p) - { - case IPPROTO_TCP : - tcp = (tcphdr_t *)fin->fin_dp; - -#if SOLARIS && defined(_KERNEL) && (SOLARIS2 >= 6) && defined(ICK_VALID) - m = fin->fin_qfm; - if (dohwcksum && (m->b_ick_flag == ICK_VALID)) - dosum = 0; -#endif - /* - * Don't bother the proxy with these...or in fact, - * should we free up proxy stuff when seen? - */ - if ((fin->fin_tcpf & TH_RST) != 0) - break; - /*FALLTHROUGH*/ - case IPPROTO_UDP : - udp = (udphdr_t *)fin->fin_dp; - break; - default : - break; - } - - apr = aps->aps_apr; - err = 0; - if (fin->fin_out != 0) { - if (apr->apr_outpkt != NULL) - err = (*apr->apr_outpkt)(fin, aps, nat); - } else { - if (apr->apr_inpkt != NULL) - err = (*apr->apr_inpkt)(fin, aps, nat); - } - - rv = APR_EXIT(err); - if (((ipf_proxy_debug > 0) && (rv != 0)) || - (ipf_proxy_debug > 8)) - printf("appr_check: out %d err %x rv %d\n", - fin->fin_out, err, rv); - if (rv == 1) - return -1; - - if (rv == 2) { - 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 (ipf_proxy_debug > 8) - printf("appr_lookup(%d,%s)\n", pr, name); - - 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; - } - if (ipf_proxy_debug > 2) - printf("appr_lookup: failed for %d/%s\n", pr, name); - 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 (ipf_proxy_debug > 7) - printf("proxy out switch set seq %d -> %d %x > %x\n", - sel, !sel, seq1, - aps->aps_seqmin[!sel]); - 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 (ipf_proxy_debug > 7) - printf("proxy seq set %d at %x to %d + %d\n", - sel, aps->aps_seqmin[sel], - aps->aps_seqoff[sel], inc); - } - - /***/ - - 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 (ipf_proxy_debug > 7) - printf("proxy out switch set ack %d -> %d %x > %x\n", - sel, !sel, seq1, - aps->aps_ackmin[!sel]); - 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 (ipf_proxy_debug > 7) - printf("proxy in switch set ack %d -> %d %x > %x\n", - sel, !sel, seq1, aps->aps_ackmin[!sel]); - 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 (ipf_proxy_debug > 7) - printf("proxy ack set %d at %x to %d + %d\n", - !sel, aps->aps_seqmin[!sel], - aps->aps_seqoff[sel], inc); - } - - /***/ - - 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 (ipf_proxy_debug > 7) - printf("proxy in switch set seq %d -> %d %x > %x\n", - sel, !sel, seq1, aps->aps_seqmin[!sel]); - sel = aps->aps_sel[1 - out] = !sel; - } - - if (aps->aps_seqoff[sel] != 0) { - if (ipf_proxy_debug > 7) - printf("sel %d seqoff %d seq1 %x seqmin %x\n", - sel, aps->aps_seqoff[sel], seq1, - aps->aps_seqmin[sel]); - if (seq1 > aps->aps_seqmin[sel]) { - seq2 = aps->aps_seqoff[sel]; - tcp->th_ack = htonl(seq1 - seq2); - ch = 1; - } - } - } - - if (ipf_proxy_debug > 8) - printf("appr_fixseqack: seq %x ack %x\n", - ntohl(tcp->th_seq), ntohl(tcp->th_ack)); - 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)(); -} |
