diff options
author | peter <peter@FreeBSD.org> | 1999-10-10 15:09:59 +0000 |
---|---|---|
committer | peter <peter@FreeBSD.org> | 1999-10-10 15:09:59 +0000 |
commit | c5fae336058615ac8e0d149bdc8b7c6efc88d07b (patch) | |
tree | 6e714dd0327e7889cd95ee2f995266b8229a10b5 /sys/netinet/ip_frag.c | |
parent | 76c8e9b267ecd06e50fdc045c919d158999307b0 (diff) | |
download | FreeBSD-src-c5fae336058615ac8e0d149bdc8b7c6efc88d07b.zip FreeBSD-src-c5fae336058615ac8e0d149bdc8b7c6efc88d07b.tar.gz |
Nuke the old antique copy of ipfilter from the tree. This is old enough
to be dangerous. It will better serve us as a port building a KLD,
ala SKIP.
The hooks are staying although it would be better to port and use
the NetBSD pfil interface rather than have custom hooks.
Diffstat (limited to 'sys/netinet/ip_frag.c')
-rw-r--r-- | sys/netinet/ip_frag.c | 467 |
1 files changed, 0 insertions, 467 deletions
diff --git a/sys/netinet/ip_frag.c b/sys/netinet/ip_frag.c deleted file mode 100644 index de104e5..0000000 --- a/sys/netinet/ip_frag.c +++ /dev/null @@ -1,467 +0,0 @@ -/* - * Copyright (C) 1993-1997 by Darren Reed. - * - * Redistribution and use in source and binary forms are permitted - * provided that this notice is preserved and due credit is given - * to the original author and the contributors. - */ -#if !defined(lint) -static const char sccsid[] = "@(#)ip_frag.c 1.11 3/24/96 (C) 1993-1995 Darren Reed"; -static const char rcsid[] = "@(#)$FreeBSD$"; -#endif - -#if !defined(_KERNEL) && defined(KERNEL) -#define _KERNEL -#endif -#define __FreeBSD_version 300000 /* it's a hack, but close enough */ - -#if !defined(_KERNEL) && !defined(KERNEL) -# include <string.h> -# include <stdlib.h> -#endif -#include <sys/errno.h> -#include <sys/types.h> -#include <sys/param.h> -#include <sys/time.h> -#include <sys/file.h> -#if defined(KERNEL) && (__FreeBSD_version >= 220000) -#include <sys/filio.h> -#include <sys/fcntl.h> -#include <sys/malloc.h> -#else -#include <sys/ioctl.h> -#endif -#include <sys/uio.h> -#ifndef linux -#include <sys/protosw.h> -#endif -#include <sys/socket.h> -#if defined(_KERNEL) && !defined(linux) -# include <sys/systm.h> -#endif -#if !defined(__SVR4) && !defined(__svr4__) -# ifndef linux -# include <sys/mbuf.h> -# endif -#else -# include <sys/byteorder.h> -# include <sys/dditypes.h> -# include <sys/stream.h> -# include <sys/kmem.h> -#endif -#if defined(KERNEL) && (__FreeBSD_version >= 300000) -#include <sys/malloc.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_proxy.h" -#include "netinet/ip_nat.h" -#include "netinet/ip_frag.h" -#include "netinet/ip_state.h" -#include "netinet/ip_auth.h" - -static ipfr_t *ipfr_heads[IPFT_SIZE]; -static ipfr_t *ipfr_nattab[IPFT_SIZE]; -static ipfrstat_t ipfr_stats; -static int ipfr_inuse = 0; - int fr_ipfrttl = 120; /* 60 seconds */ -#ifdef _KERNEL -extern int ipfr_timer_id; -#endif -#if (SOLARIS || defined(__sgi)) && defined(_KERNEL) -extern kmutex_t ipf_frag; -extern kmutex_t ipf_natfrag; -extern kmutex_t ipf_nat; -#endif - - -static ipfr_t *ipfr_new __P((ip_t *, fr_info_t *, int, ipfr_t **)); -static ipfr_t *ipfr_lookup __P((ip_t *, fr_info_t *, ipfr_t **)); - - -ipfrstat_t *ipfr_fragstats() -{ - ipfr_stats.ifs_table = ipfr_heads; - ipfr_stats.ifs_nattab = ipfr_nattab; - ipfr_stats.ifs_inuse = ipfr_inuse; - return &ipfr_stats; -} - - -/* - * add a new entry to the fragment cache, registering it as having come - * through this box, with the result of the filter operation. - */ -static ipfr_t *ipfr_new(ip, fin, pass, table) -ip_t *ip; -fr_info_t *fin; -int pass; -ipfr_t *table[]; -{ - ipfr_t **fp, *fr, frag; - u_int idx; - - frag.ipfr_p = ip->ip_p; - idx = ip->ip_p; - frag.ipfr_id = ip->ip_id; - idx += ip->ip_id; - frag.ipfr_tos = ip->ip_tos; - frag.ipfr_src.s_addr = ip->ip_src.s_addr; - idx += ip->ip_src.s_addr; - frag.ipfr_dst.s_addr = ip->ip_dst.s_addr; - idx += ip->ip_dst.s_addr; - idx *= 127; - idx %= IPFT_SIZE; - - /* - * first, make sure it isn't already there... - */ - for (fp = &table[idx]; (fr = *fp); fp = &fr->ipfr_next) - if (!bcmp((char *)&frag.ipfr_src, (char *)&fr->ipfr_src, - IPFR_CMPSZ)) { - ipfr_stats.ifs_exists++; - return NULL; - } - - /* - * allocate some memory, if possible, if not, just record that we - * failed to do so. - */ - KMALLOC(fr, ipfr_t *, sizeof(*fr)); - if (fr == NULL) { - ipfr_stats.ifs_nomem++; - return NULL; - } - - /* - * Instert the fragment into the fragment table, copy the struct used - * in the search using bcopy rather than reassign each field. - * Set the ttl to the default and mask out logging from "pass" - */ - if ((fr->ipfr_next = table[idx])) - table[idx]->ipfr_prev = fr; - fr->ipfr_prev = NULL; - fr->ipfr_data = NULL; - table[idx] = fr; - bcopy((char *)&frag.ipfr_src, (char *)&fr->ipfr_src, IPFR_CMPSZ); - fr->ipfr_ttl = fr_ipfrttl; - fr->ipfr_pass = pass & ~(FR_LOGFIRST|FR_LOG); - /* - * Compute the offset of the expected start of the next packet. - */ - fr->ipfr_off = (ip->ip_off & 0x1fff) + (fin->fin_dlen >> 3); - ipfr_stats.ifs_new++; - ipfr_inuse++; - return fr; -} - - -int ipfr_newfrag(ip, fin, pass) -ip_t *ip; -fr_info_t *fin; -int pass; -{ - ipfr_t *ipf; - - MUTEX_ENTER(&ipf_frag); - ipf = ipfr_new(ip, fin, pass, ipfr_heads); - MUTEX_EXIT(&ipf_frag); - return ipf ? 0 : -1; -} - - -int ipfr_nat_newfrag(ip, fin, pass, nat) -ip_t *ip; -fr_info_t *fin; -int pass; -nat_t *nat; -{ - ipfr_t *ipf; - - MUTEX_ENTER(&ipf_natfrag); - if ((ipf = ipfr_new(ip, fin, pass, ipfr_nattab))) { - ipf->ipfr_data = nat; - nat->nat_data = ipf; - } - MUTEX_EXIT(&ipf_natfrag); - return ipf ? 0 : -1; -} - - -/* - * check the fragment cache to see if there is already a record of this packet - * with its filter result known. - */ -static ipfr_t *ipfr_lookup(ip, fin, table) -ip_t *ip; -fr_info_t *fin; -ipfr_t *table[]; -{ - ipfr_t *f, frag; - u_int idx; - - /* - * For fragments, we record protocol, packet id, TOS and both IP#'s - * (these should all be the same for all fragments of a packet). - * - * build up a hash value to index the table with. - */ - frag.ipfr_p = ip->ip_p; - idx = ip->ip_p; - frag.ipfr_id = ip->ip_id; - idx += ip->ip_id; - frag.ipfr_tos = ip->ip_tos; - frag.ipfr_src.s_addr = ip->ip_src.s_addr; - idx += ip->ip_src.s_addr; - frag.ipfr_dst.s_addr = ip->ip_dst.s_addr; - idx += ip->ip_dst.s_addr; - idx *= 127; - idx %= IPFT_SIZE; - - /* - * check the table, careful to only compare the right amount of data - */ - for (f = table[idx]; f; f = f->ipfr_next) - if (!bcmp((char *)&frag.ipfr_src, (char *)&f->ipfr_src, - IPFR_CMPSZ)) { - u_short atoff, off; - - if (f != table[idx]) { - /* - * move fragment info. to the top of the list - * to speed up searches. - */ - if ((f->ipfr_prev->ipfr_next = f->ipfr_next)) - f->ipfr_next->ipfr_prev = f->ipfr_prev; - f->ipfr_next = table[idx]; - table[idx]->ipfr_prev = f; - f->ipfr_prev = NULL; - table[idx] = f; - } - off = ip->ip_off; - atoff = off + (fin->fin_dlen >> 3); - /* - * If we've follwed the fragments, and this is the - * last (in order), shrink expiration time. - */ - if ((off & 0x1fff) == f->ipfr_off) { - if (!(off & IP_MF)) - f->ipfr_ttl = 1; - else - f->ipfr_off = atoff; - } - ipfr_stats.ifs_hits++; - return f; - } - return NULL; -} - - -/* - * functional interface for NAT lookups of the NAT fragment cache - */ -nat_t *ipfr_nat_knownfrag(ip, fin) -ip_t *ip; -fr_info_t *fin; -{ - nat_t *nat; - ipfr_t *ipf; - - MUTEX_ENTER(&ipf_natfrag); - ipf = ipfr_lookup(ip, fin, ipfr_nattab); - if (ipf) { - nat = ipf->ipfr_data; - /* - * This is the last fragment for this packet. - */ - if (ipf->ipfr_ttl == 1) { - nat->nat_data = NULL; - ipf->ipfr_data = NULL; - } - } else - nat = NULL; - MUTEX_EXIT(&ipf_natfrag); - return nat; -} - - -/* - * functional interface for normal lookups of the fragment cache - */ -int ipfr_knownfrag(ip, fin) -ip_t *ip; -fr_info_t *fin; -{ - int ret; - ipfr_t *ipf; - - MUTEX_ENTER(&ipf_frag); - ipf = ipfr_lookup(ip, fin, ipfr_heads); - ret = ipf ? ipf->ipfr_pass : 0; - MUTEX_EXIT(&ipf_frag); - return ret; -} - - -/* - * forget any references to this external object. - */ -void ipfr_forget(nat) -void *nat; -{ - ipfr_t *fr; - int idx; - - MUTEX_ENTER(&ipf_natfrag); - for (idx = IPFT_SIZE - 1; idx >= 0; idx--) - for (fr = ipfr_heads[idx]; fr; fr = fr->ipfr_next) - if (fr->ipfr_data == nat) - fr->ipfr_data = NULL; - - MUTEX_EXIT(&ipf_natfrag); -} - - -/* - * Free memory in use by fragment state info. kept. - */ -void ipfr_unload() -{ - ipfr_t **fp, *fr; - nat_t *nat; - int idx; - - MUTEX_ENTER(&ipf_frag); - for (idx = IPFT_SIZE - 1; idx >= 0; idx--) - for (fp = &ipfr_heads[idx]; (fr = *fp); ) { - *fp = fr->ipfr_next; - KFREE(fr); - } - MUTEX_EXIT(&ipf_frag); - - MUTEX_ENTER(&ipf_nat); - MUTEX_ENTER(&ipf_natfrag); - for (idx = IPFT_SIZE - 1; idx >= 0; idx--) - for (fp = &ipfr_nattab[idx]; (fr = *fp); ) { - *fp = fr->ipfr_next; - if ((nat = (nat_t *)fr->ipfr_data)) { - if (nat->nat_data == fr) - nat->nat_data = NULL; - } - KFREE(fr); - } - MUTEX_EXIT(&ipf_natfrag); - MUTEX_EXIT(&ipf_nat); -} - - -#ifdef _KERNEL -/* - * Slowly expire held state for fragments. Timeouts are set * in expectation - * of this being called twice per second. - */ -# if (BSD >= 199306) || SOLARIS || defined(__sgi) -void ipfr_slowtimer() -# else -int ipfr_slowtimer() -# endif -{ - ipfr_t **fp, *fr; - nat_t *nat; - int s, idx; - -#ifdef __sgi - ipfilter_sgi_intfsync(); -#endif - - SPL_NET(s); - MUTEX_ENTER(&ipf_frag); - - /* - * Go through the entire table, looking for entries to expire, - * decreasing the ttl by one for each entry. If it reaches 0, - * remove it from the chain and free it. - */ - for (idx = IPFT_SIZE - 1; idx >= 0; idx--) - for (fp = &ipfr_heads[idx]; (fr = *fp); ) { - --fr->ipfr_ttl; - if (fr->ipfr_ttl == 0) { - if (fr->ipfr_prev) - fr->ipfr_prev->ipfr_next = - fr->ipfr_next; - if (fr->ipfr_next) - fr->ipfr_next->ipfr_prev = - fr->ipfr_prev; - *fp = fr->ipfr_next; - ipfr_stats.ifs_expire++; - ipfr_inuse--; - KFREE(fr); - } else - fp = &fr->ipfr_next; - } - MUTEX_EXIT(&ipf_frag); - - /* - * Same again for the NAT table, except that if the structure also - * still points to a NAT structure, and the NAT structure points back - * at the one to be free'd, NULL the reference from the NAT struct. - * NOTE: We need to grab both mutex's early, and in this order so as - * to prevent a deadlock if both try to expire at the same time. - */ - MUTEX_ENTER(&ipf_nat); - MUTEX_ENTER(&ipf_natfrag); - for (idx = IPFT_SIZE - 1; idx >= 0; idx--) - for (fp = &ipfr_nattab[idx]; (fr = *fp); ) { - --fr->ipfr_ttl; - if (fr->ipfr_ttl == 0) { - if (fr->ipfr_prev) - fr->ipfr_prev->ipfr_next = - fr->ipfr_next; - if (fr->ipfr_next) - fr->ipfr_next->ipfr_prev = - fr->ipfr_prev; - *fp = fr->ipfr_next; - ipfr_stats.ifs_expire++; - ipfr_inuse--; - if ((nat = (nat_t *)fr->ipfr_data)) { - if (nat->nat_data == fr) - nat->nat_data = NULL; - } - KFREE(fr); - } else - fp = &fr->ipfr_next; - } - MUTEX_EXIT(&ipf_natfrag); - MUTEX_EXIT(&ipf_nat); - SPL_X(s); - fr_timeoutstate(); - ip_natexpire(); - fr_authexpire(); -# if SOLARIS - ipfr_timer_id = timeout(ipfr_slowtimer, NULL, drv_usectohz(500000)); -# else -# ifndef linux - ip_slowtimo(); -# endif -# if (BSD < 199306) && !defined(__sgi) - return 0; -# endif -# endif -} -#endif /* defined(_KERNEL) */ |