976 lines
20 KiB
C
976 lines
20 KiB
C
/*
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* Copyright (C) 1993-2001 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(lint)
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static const char rcsid[] = "@(#)$Id: ip_lfil.c,v 2.6.2.5 2002/10/03 13:47:19 darrenr Exp $";
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#endif
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#if defined(KERNEL) && !defined(_KERNEL)
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# define _KERNEL
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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/file.h>
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#include <sys/ioctl.h>
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#include <sys/time.h>
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#include <sys/dir.h>
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#include <sys/socket.h>
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#ifndef _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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#else
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# include <linux/module.h>
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#endif
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#include <net/if.h>
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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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#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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#ifndef _KERNEL
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# include <syslog.h>
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#endif
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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_proxy.h"
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#include "netinet/ip_frag.h"
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#include "netinet/ip_state.h"
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#include "netinet/ip_auth.h"
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#ifdef _KERNEL
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#include <net/ip_forward.h>
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#endif
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#ifndef MIN
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#define MIN(a,b) (((a)<(b))?(a):(b))
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#endif
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#ifndef _KERNEL
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# include "ipt.h"
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static struct ifnet **ifneta = NULL;
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static int nifs = 0;
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#endif
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int fr_running = 0;
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int ipl_unreach = ICMP_UNREACH_FILTER;
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u_long ipl_frouteok[2] = {0, 0};
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static int frzerostats __P((caddr_t));
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static void frsync __P((void));
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#if defined(__NetBSD__) || defined(__OpenBSD__)
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static int frrequest __P((int, u_long, caddr_t, int));
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#else
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static int frrequest __P((int, u_long, caddr_t, int));
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#endif
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#ifdef _KERNEL
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static int (*fr_savep) __P((ip_t *, int, void *, int, mb_t **));
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#else
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int ipllog __P((void));
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void init_ifp __P((void));
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static int no_output __P((mb_t *, struct ifnet *));
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static int write_output __P((mb_t *, struct ifnet *));
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#endif
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#ifdef _KERNEL
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int fr_precheck(struct iphdr *ip, struct device *dev, int out, struct device **ifp)
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{
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int hlen = ip->ihl << 2;
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return fr_check((ip_t *)ip, hlen, dev, out, (mb_t **)ifp);
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}
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int iplattach()
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{
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char *defpass;
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int s;
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if (fr_running || (fr_checkp == fr_precheck)) {
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printk("IP Filter: already initialized\n");
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return EBUSY;
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}
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fr_running = 1;
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bzero((char *)frcache, sizeof(frcache));
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bzero((char *)nat_table, sizeof(nat_table));
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fr_savep = fr_checkp;
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fr_checkp = fr_precheck;
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# ifdef IPFILTER_LOG
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ipflog_init();
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# endif
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if (fr_pass & FR_PASS)
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defpass = "pass";
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else if (fr_pass & FR_BLOCK)
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defpass = "block";
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else
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defpass = "no-match -> block";
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printk("IP Filter: initialized. Default = %s all, Logging = %s\n",
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defpass,
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# ifdef IPFILTER_LOG
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"enabled");
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# else
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"disabled");
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# endif
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return 0;
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}
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/*
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* Disable the filter by removing the hooks from the IP input/output
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* stream.
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*/
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int ipldetach()
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{
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int s, i = FR_INQUE|FR_OUTQUE;
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if (!fr_running)
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{
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printk("IP Filter: not initialized\n");
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return 0;
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}
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fr_checkp = fr_savep;
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i = frflush(IPL_LOGIPF, i);
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fr_running = 0;
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ipfr_unload();
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ip_natunload();
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fr_stateunload();
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fr_authunload();
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printk("IP Filter: unloaded\n");
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return 0;
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}
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#endif /* _KERNEL */
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static int frzerostats(data)
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caddr_t data;
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{
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struct friostat fio;
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int error;
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bcopy((char *)frstats, (char *)fio.f_st,
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sizeof(struct filterstats) * 2);
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fio.f_fin[0] = ipfilter[0][0];
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fio.f_fin[1] = ipfilter[0][1];
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fio.f_fout[0] = ipfilter[1][0];
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fio.f_fout[1] = ipfilter[1][1];
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fio.f_acctin[0] = ipacct[0][0];
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fio.f_acctin[1] = ipacct[0][1];
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fio.f_acctout[0] = ipacct[1][0];
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fio.f_acctout[1] = ipacct[1][1];
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fio.f_active = fr_active;
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fio.f_froute[0] = ipl_frouteok[0];
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fio.f_froute[1] = ipl_frouteok[1];
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error = IWCOPYPTR((caddr_t)&fio, data, sizeof(fio));
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if (!error)
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bzero((char *)frstats, sizeof(*frstats) * 2);
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return error;
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}
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/*
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* Filter ioctl interface.
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*/
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#if defined(_KERNEL)
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int iplioctl(struct inode *inode, struct file *file, u_int cmd, u_long arg)
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{
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int s;
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caddr_t data = (caddr_t)arg;
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int mode = file->f_mode;
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#else
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int iplioctl(dev_t dev, int cmd, caddr_t data, int mode)
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{
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#endif
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int error = 0, unit = 0, tmp;
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#ifdef _KERNEL
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unit = GET_MINOR(inode->i_rdev);
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if ((IPL_LOGMAX < unit) || (unit < 0))
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return ENXIO;
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#endif
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if (unit == IPL_LOGNAT) {
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error = nat_ioctl(data, cmd, mode);
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return error;
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}
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if (unit == IPL_LOGSTATE) {
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error = fr_state_ioctl(data, cmd, mode);
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return error;
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}
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switch (cmd) {
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case FIONREAD :
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#ifdef IPFILTER_LOG
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error = IWCOPY((caddr_t)&iplused[IPL_LOGIPF], data,
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sizeof(iplused[IPL_LOGIPF]));
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#endif
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break;
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#if !defined(IPFILTER_LKM) && defined(_KERNEL)
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case SIOCFRENB :
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{
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u_int enable;
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if (!(mode & FWRITE))
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error = EPERM;
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else {
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error = IRCOPY(data, (caddr_t)&enable, sizeof(enable));
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if (error)
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break;
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if (enable)
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error = iplattach();
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else
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error = ipldetach();
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}
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break;
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}
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#endif
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case SIOCSETFF :
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if (!(mode & FWRITE))
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error = EPERM;
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else
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error = IRCOPY(data, (caddr_t)&fr_flags,
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sizeof(fr_flags));
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break;
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case SIOCGETFF :
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error = IWCOPY((caddr_t)&fr_flags, data, sizeof(fr_flags));
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break;
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case SIOCINAFR :
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case SIOCRMAFR :
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case SIOCADAFR :
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case SIOCZRLST :
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if (!(mode & FWRITE))
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error = EPERM;
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else
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error = frrequest(unit, cmd, data, fr_active);
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break;
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case SIOCINIFR :
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case SIOCRMIFR :
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case SIOCADIFR :
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if (!(mode & FWRITE))
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error = EPERM;
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else
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error = frrequest(unit, cmd, data, 1 - fr_active);
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break;
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case SIOCSWAPA :
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if (!(mode & FWRITE))
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error = EPERM;
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else {
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bzero((char *)frcache, sizeof(frcache[0]) * 2);
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*(u_int *)data = fr_active;
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fr_active = 1 - fr_active;
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}
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break;
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case SIOCGETFS :
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{
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struct friostat fio;
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bcopy((char *)frstats, (char *)fio.f_st,
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sizeof(struct filterstats) * 2);
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fio.f_fin[0] = ipfilter[0][0];
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fio.f_fin[1] = ipfilter[0][1];
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fio.f_fout[0] = ipfilter[1][0];
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fio.f_fout[1] = ipfilter[1][1];
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fio.f_acctin[0] = ipacct[0][0];
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fio.f_acctin[1] = ipacct[0][1];
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fio.f_acctout[0] = ipacct[1][0];
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fio.f_acctout[1] = ipacct[1][1];
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fio.f_auth = ipauth;
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fio.f_active = fr_active;
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fio.f_froute[0] = ipl_frouteok[0];
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fio.f_froute[1] = ipl_frouteok[1];
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error = IWCOPYPTR((caddr_t)&fio, data, sizeof(fio));
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break;
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}
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case SIOCFRZST :
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if (!(mode & FWRITE))
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error = EPERM;
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else
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error = frzerostats(data);
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break;
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case SIOCIPFFL :
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if (!(mode & FWRITE))
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error = EPERM;
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else {
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error = IRCOPY(data, (caddr_t)&tmp, sizeof(tmp));
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if (!error) {
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tmp = frflush(unit, tmp);
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error = IWCOPY((caddr_t)&tmp, data,
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sizeof(tmp));
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}
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}
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break;
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#ifdef IPFILTER_LOG
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case SIOCIPFFB :
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if (!(mode & FWRITE))
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error = EPERM;
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else
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*(int *)data = ipflog_clear(unit);
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break;
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#endif /* IPFILTER_LOG */
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case SIOCGFRST :
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error = IWCOPYPTR((caddr_t)ipfr_fragstats(), data,
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sizeof(ipfrstat_t));
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break;
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case SIOCFRSYN :
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if (!(mode & FWRITE))
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error = EPERM;
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else {
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#if defined(_KERNEL) && defined(__sgi)
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ipfsync();
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#endif
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frsync();
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}
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break;
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default :
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error = EINVAL;
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break;
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}
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return error;
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}
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static void frsync()
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{
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#ifdef _KERNEL
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struct device *dev;
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for (dev = dev_base; dev; dev = dev->next)
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ip_natsync(dev);
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#endif
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}
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static int frrequest(unit, req, data, set)
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int unit;
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u_long req;
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int set;
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caddr_t data;
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{
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register frentry_t *fp, *f, **fprev;
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register frentry_t **ftail;
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frentry_t frd;
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frdest_t *fdp;
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frgroup_t *fg = NULL;
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int error = 0, in;
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u_int group;
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fp = &frd;
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error = IRCOPYPTR(data, (caddr_t)fp, sizeof(*fp));
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if (error)
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return error;
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/*
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* Check that the group number does exist and that if a head group
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* has been specified, doesn't exist.
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*/
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if (fp->fr_grhead &&
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fr_findgroup((u_int)fp->fr_grhead, fp->fr_flags, unit, set, NULL))
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return EEXIST;
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if (fp->fr_group &&
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!fr_findgroup((u_int)fp->fr_group, fp->fr_flags, unit, set, NULL))
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return ESRCH;
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in = (fp->fr_flags & FR_INQUE) ? 0 : 1;
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if (unit == IPL_LOGAUTH)
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ftail = fprev = &ipauth;
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else if (fp->fr_flags & FR_ACCOUNT)
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ftail = fprev = &ipacct[in][set];
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else if (fp->fr_flags & (FR_OUTQUE|FR_INQUE))
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ftail = fprev = &ipfilter[in][set];
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else
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return ESRCH;
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if ((group = fp->fr_group)) {
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if (!(fg = fr_findgroup(group, fp->fr_flags, unit, set, NULL)))
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return ESRCH;
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ftail = fprev = fg->fg_start;
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}
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bzero((char *)frcache, sizeof(frcache[0]) * 2);
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if (*fp->fr_ifname) {
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fp->fr_ifa = GETUNIT(fp->fr_ifname, fp->fr_ip.fi_v);
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if (!fp->fr_ifa)
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fp->fr_ifa = (void *)-1;
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}
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fdp = &fp->fr_dif;
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fp->fr_flags &= ~FR_DUP;
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if (*fdp->fd_ifname) {
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fdp->fd_ifp = GETUNIT(fdp->fd_ifname, fp->fr_ip.fi_v);
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if (!fdp->fd_ifp)
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fdp->fd_ifp = (struct ifnet *)-1;
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else
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fp->fr_flags |= FR_DUP;
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}
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fdp = &fp->fr_tif;
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if (*fdp->fd_ifname) {
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fdp->fd_ifp = GETUNIT(fdp->fd_ifname, fp->fr_ip.fi_v);
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if (!fdp->fd_ifp)
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fdp->fd_ifp = (struct ifnet *)-1;
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}
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/*
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* Look for a matching filter rule, but don't include the next or
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* interface pointer in the comparison (fr_next, fr_ifa).
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*/
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for (; (f = *ftail); ftail = &f->fr_next)
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if (bcmp((char *)&f->fr_ip, (char *)&fp->fr_ip,
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FR_CMPSIZ) == 0)
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break;
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/*
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* If zero'ing statistics, copy current to caller and zero.
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*/
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if (req == SIOCZRLST) {
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if (!f)
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return ESRCH;
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error = IWCOPYPTR((caddr_t)f, data, sizeof(*f));
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if (error)
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return error;
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f->fr_hits = 0;
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f->fr_bytes = 0;
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return 0;
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}
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if (!f) {
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if (req == SIOCINAFR || req == SIOCINIFR) {
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ftail = fprev;
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if (fp->fr_hits) {
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while (--fp->fr_hits && (f = *ftail)) {
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ftail = &f->fr_next;
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}
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}
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}
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f = NULL;
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}
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if (req == SIOCRMAFR || req == SIOCRMIFR) {
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if (!f)
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error = ESRCH;
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else {
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if (f->fr_ref > 1)
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return EBUSY;
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if (fg && fg->fg_head)
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fg->fg_head->fr_ref--;
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if (unit == IPL_LOGAUTH)
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return fr_auth_ioctl(data, mode, req, f, ftail);
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if (f->fr_grhead)
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fr_delgroup((u_int)f->fr_grhead, fp->fr_flags,
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unit, set);
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fixskip(fprev, f, -1);
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*ftail = f->fr_next;
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KFREE(f);
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}
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} else {
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if (f)
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error = EEXIST;
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else {
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if (unit == IPL_LOGAUTH)
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return fr_auth_ioctl(data, mode, req, f, ftail);
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KMALLOC(f, frentry_t *);
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if (f != NULL) {
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if (fg && fg->fg_head)
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fg->fg_head->fr_ref++;
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bcopy((char *)fp, (char *)f, sizeof(*f));
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f->fr_ref = 1;
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f->fr_hits = 0;
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f->fr_next = *ftail;
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*ftail = f;
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if (req == SIOCINIFR || req == SIOCINAFR)
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fixskip(fprev, f, 1);
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f->fr_grp = NULL;
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if ((group = f->fr_grhead))
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fg = fr_addgroup(group, f, unit, set);
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} else
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error = ENOMEM;
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}
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}
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return (error);
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}
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|
|
|
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#ifdef _KERNEL
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/*
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* routines below for saving IP headers to buffer
|
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*/
|
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int iplopen(struct inode *inode, struct file *file)
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{
|
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u_int min = GET_MINOR(inode->i_rdev);
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|
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if (IPL_LOGMAX < min)
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min = ENXIO;
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else {
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MOD_INC_USE_COUNT;
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min = 0;
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}
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return min;
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}
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|
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|
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void iplclose(struct inode *inode, struct file *file)
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{
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u_int min = GET_MINOR(inode->i_rdev);
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|
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if (IPL_LOGMAX >= min) {
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MOD_DEC_USE_COUNT;
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}
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}
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|
|
|
/*
|
|
* iplread/ipllog
|
|
* both of these must operate with at least splnet() lest they be
|
|
* called during packet processing and cause an inconsistancy to appear in
|
|
* the filter lists.
|
|
*/
|
|
int iplread(struct inode *inode, struct file *file, char *buf, int nbytes)
|
|
{
|
|
struct uio uiob, *uio = &uiob;
|
|
|
|
uio->uio_buf = buf;
|
|
uio->uio_resid = nbytes;
|
|
# ifdef IPFILTER_LOG
|
|
return ipflog_read(GET_MINOR(inode->i_rdev), uio);
|
|
# else
|
|
return ENXIO;
|
|
# endif
|
|
}
|
|
|
|
|
|
/*
|
|
* send_reset - this could conceivably be a call to tcp_respond(), but that
|
|
* requires a large amount of setting up and isn't any more efficient.
|
|
*/
|
|
int send_reset(ti, ifp)
|
|
struct tcpiphdr *ti;
|
|
struct ifnet *ifp;
|
|
{
|
|
tcphdr_t *tcp;
|
|
int tlen = 0;
|
|
ip_t *ip;
|
|
mb_t *m;
|
|
|
|
if (ti->ti_flags & TH_RST)
|
|
return -1; /* feedback loop */
|
|
|
|
m = alloc_skb(sizeof(tcpiphdr_t), GFP_ATOMIC);
|
|
if (m == NULL)
|
|
return -1;
|
|
|
|
if (ti->ti_flags & TH_SYN)
|
|
tlen = 1;
|
|
|
|
m->dev = ifp;
|
|
m->csum = 0;
|
|
ip = mtod(m, ip_t *);
|
|
m->h.iph = ip;
|
|
m->ip_hdr = NULL;
|
|
m->m_len = sizeof(tcpiphdr_t);
|
|
tcp = (tcphdr_t *)((char *)ip + sizeof(ip_t));
|
|
bzero((char *)ip, sizeof(tcpiphdr_t));
|
|
|
|
ip->ip_v = IPVERSION;
|
|
ip->ip_hl = sizeof(ip_t) >> 2;
|
|
ip->ip_tos = ((ip_t *)ti)->ip_tos;
|
|
ip->ip_p = ((ip_t *)ti)->ip_p;
|
|
ip->ip_id = ((ip_t *)ti)->ip_id;
|
|
ip->ip_len = htons(sizeof(tcpiphdr_t));
|
|
ip->ip_ttl = 127;
|
|
ip->ip_src.s_addr = ti->ti_dst.s_addr;
|
|
ip->ip_dst.s_addr = ti->ti_src.s_addr;
|
|
tcp->th_dport = ti->ti_sport;
|
|
tcp->th_sport = ti->ti_dport;
|
|
tcp->th_ack = htonl(ntohl(ti->ti_seq) + tlen);
|
|
tcp->th_off = sizeof(tcphdr_t) >> 2;
|
|
tcp->th_flags = TH_RST|TH_ACK;
|
|
|
|
ip->ip_sum = 0;
|
|
ip->ip_sum = ipf_cksum((u_short *)ip, sizeof(ip_t));
|
|
tcp->th_sum = fr_tcpsum(m, ip, tcp);
|
|
return ip_forward(m, NULL, IPFWD_NOTTLDEC, ip->ip_dst.s_addr);
|
|
}
|
|
|
|
|
|
size_t mbufchainlen(m0)
|
|
register mb_t *m0;
|
|
{
|
|
register size_t len = 0;
|
|
|
|
for (; m0; m0 = m0->m_next)
|
|
len += m0->m_len;
|
|
return len;
|
|
}
|
|
|
|
|
|
void ipfr_fastroute(m0, fin, fdp)
|
|
mb_t *m0;
|
|
fr_info_t *fin;
|
|
frdest_t *fdp;
|
|
{
|
|
#if notyet
|
|
register ip_t *ip, *mhip;
|
|
register mb_t *m = m0;
|
|
register struct route *ro;
|
|
struct ifnet *ifp = fdp->fd_ifp;
|
|
int len, off, error = 0;
|
|
int hlen = fin->fin_hlen;
|
|
struct route iproute;
|
|
struct sockaddr_in *dst;
|
|
|
|
ip = mtod(m0, ip_t *);
|
|
/*
|
|
* Route packet.
|
|
*/
|
|
ro = &iproute;
|
|
bzero((caddr_t)ro, sizeof (*ro));
|
|
dst = (struct sockaddr_in *)&ro->ro_dst;
|
|
dst->sin_family = AF_INET;
|
|
dst->sin_addr = fdp->fd_ip.s_addr ? fdp->fd_ip : ip->ip_dst;
|
|
/*
|
|
* XXX -allocate route here
|
|
*/
|
|
if (!ifp) {
|
|
if (!(fin->fin_fr->fr_flags & FR_FASTROUTE)) {
|
|
error = -2;
|
|
goto bad;
|
|
}
|
|
if (ro->ro_rt == 0 || (ifp = ro->ro_rt->rt_ifp) == 0) {
|
|
if (in_localaddr(ip->ip_dst))
|
|
error = EHOSTUNREACH;
|
|
else
|
|
error = ENETUNREACH;
|
|
goto bad;
|
|
}
|
|
if (ro->ro_rt->rt_flags & RTF_GATEWAY)
|
|
dst = (struct sockaddr_in *)&ro->ro_rt->rt_gateway;
|
|
}
|
|
ro->ro_rt->rt_use++;
|
|
|
|
/*
|
|
* For input packets which are being "fastrouted", they won't
|
|
* go back through output filtering and miss their chance to get
|
|
* NAT'd.
|
|
*/
|
|
(void) ip_natout(ip, hlen, fin);
|
|
if (fin->fin_out)
|
|
ip->ip_sum = 0;
|
|
/*
|
|
* If small enough for interface, can just send directly.
|
|
*/
|
|
if (ip->ip_len <= ifp->if_mtu) {
|
|
# ifndef sparc
|
|
ip->ip_id = htons(ip->ip_id);
|
|
ip->ip_len = htons(ip->ip_len);
|
|
ip->ip_off = htons(ip->ip_off);
|
|
# endif
|
|
if (!ip->ip_sum)
|
|
ip->ip_sum = in_cksum(m, hlen);
|
|
error = (*ifp->hard_start_xmit)(m, ifp, m);
|
|
goto done;
|
|
}
|
|
/*
|
|
* Too large for interface; fragment if possible.
|
|
* Must be able to put at least 8 bytes per fragment.
|
|
*/
|
|
if (ip->ip_off & IP_DF) {
|
|
error = EMSGSIZE;
|
|
goto bad;
|
|
}
|
|
len = (ifp->if_mtu - hlen) &~ 7;
|
|
if (len < 8) {
|
|
error = EMSGSIZE;
|
|
goto bad;
|
|
}
|
|
|
|
{
|
|
int mhlen, firstlen = len;
|
|
mb_t **mnext = &m->m_act;
|
|
|
|
/*
|
|
* Loop through length of segment after first fragment,
|
|
* make new header and copy data of each part and link onto chain.
|
|
*/
|
|
m0 = m;
|
|
mhlen = sizeof (struct ip);
|
|
for (off = hlen + len; off < ip->ip_len; off += len) {
|
|
MGET(m, M_DONTWAIT, MT_HEADER);
|
|
if (m == 0) {
|
|
error = ENOBUFS;
|
|
goto bad;
|
|
}
|
|
m->m_data += max_linkhdr;
|
|
mhip = mtod(m, struct ip *);
|
|
bcopy((char *)ip, (char *)mhip, sizeof(*ip));
|
|
if (hlen > sizeof (struct ip)) {
|
|
mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
|
|
mhip->ip_hl = mhlen >> 2;
|
|
}
|
|
m->m_len = mhlen;
|
|
mhip->ip_off = ((off - hlen) >> 3) + (ip->ip_off & ~IP_MF);
|
|
if (ip->ip_off & IP_MF)
|
|
mhip->ip_off |= IP_MF;
|
|
if (off + len >= ip->ip_len)
|
|
len = ip->ip_len - off;
|
|
else
|
|
mhip->ip_off |= IP_MF;
|
|
mhip->ip_len = htons((u_short)(len + mhlen));
|
|
m->m_next = m_copy(m0, off, len);
|
|
if (m->m_next == 0) {
|
|
error = ENOBUFS; /* ??? */
|
|
goto sendorfree;
|
|
}
|
|
# ifndef sparc
|
|
mhip->ip_off = htons((u_short)mhip->ip_off);
|
|
# endif
|
|
mhip->ip_sum = 0;
|
|
mhip->ip_sum = in_cksum(m, mhlen);
|
|
*mnext = m;
|
|
mnext = &m->m_act;
|
|
}
|
|
/*
|
|
* Update first fragment by trimming what's been copied out
|
|
* and updating header, then send each fragment (in order).
|
|
*/
|
|
m_adj(m0, hlen + firstlen - ip->ip_len);
|
|
ip->ip_len = htons((u_short)(hlen + firstlen));
|
|
ip->ip_off = htons((u_short)(ip->ip_off | IP_MF));
|
|
ip->ip_sum = 0;
|
|
ip->ip_sum = in_cksum(m0, hlen);
|
|
sendorfree:
|
|
for (m = m0; m; m = m0) {
|
|
m0 = m->m_act;
|
|
m->m_act = 0;
|
|
if (error == 0)
|
|
error = (*ifp->if_output)(ifp, m,
|
|
(struct sockaddr *)dst);
|
|
else
|
|
m_freem(m);
|
|
}
|
|
}
|
|
done:
|
|
if (!error)
|
|
ipl_frouteok[0]++;
|
|
else
|
|
ipl_frouteok[1]++;
|
|
|
|
if (ro->ro_rt) {
|
|
RTFREE(ro->ro_rt);
|
|
}
|
|
return;
|
|
bad:
|
|
m_freem(m);
|
|
goto done;
|
|
# endif
|
|
}
|
|
|
|
|
|
/*
|
|
* Fake BSD uiomove() call.
|
|
*/
|
|
int uiomove(caddr_t src, size_t ssize, int rw, struct uio *uio)
|
|
{
|
|
int error;
|
|
size_t mv = MIN(ssize, uio->uio_resid);
|
|
|
|
if (rw == UIO_READ) {
|
|
error = IWCOPY(src, (caddr_t)uio->uio_buf, mv);
|
|
} else if (rw == UIO_WRITE) {
|
|
error = IRCOPY((caddr_t)uio->uio_buf, src, mv);
|
|
} else
|
|
error = EINVAL;
|
|
if (!error) {
|
|
uio->uio_resid -= mv;
|
|
uio->uio_buf += mv;
|
|
}
|
|
return error;
|
|
}
|
|
|
|
# ifdef IPFILTER_LKM
|
|
# ifndef IPL_MAJOR
|
|
# define IPL_MAJOR 95
|
|
# endif
|
|
|
|
# ifndef IPL_NAME
|
|
# define IPL_NAME "/dev/ipl"
|
|
# endif
|
|
|
|
static struct file_operations ipl_fops = {
|
|
NULL, /* lseek */
|
|
iplread, /* read */
|
|
NULL, /* write */
|
|
NULL, /* readdir */
|
|
NULL, /* select */
|
|
iplioctl, /* ioctl */
|
|
NULL, /* mmap */
|
|
iplopen, /* open */
|
|
iplclose, /* release */
|
|
NULL, /* fsync */
|
|
NULL, /* fasync */
|
|
NULL, /* check_media_change */
|
|
NULL, /* revalidate */
|
|
};
|
|
|
|
|
|
int init_module(void)
|
|
{
|
|
int error = 0, major;
|
|
|
|
if (register_chrdev(IPL_MAJOR, "ipf", &ipl_fops)) {
|
|
printk("ipf: unable to get major number: %d\n", IPL_MAJOR);
|
|
return -EIO;
|
|
}
|
|
|
|
error = iplattach();
|
|
if (!error)
|
|
register_symtab(0);
|
|
return -error;
|
|
}
|
|
|
|
void cleanup_module(void)
|
|
{
|
|
unregister_chrdev(IPL_MAJOR, "ipf");
|
|
(void) ipldetach();
|
|
}
|
|
# endif /* IPFILTER_LKM */
|
|
#else /* #ifdef _KERNEL */
|
|
|
|
|
|
static int no_output __P((mb_t *m, struct ifnet *ifp))
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int write_output __P((mb_t *m, struct ifnet *ifp))
|
|
{
|
|
FILE *fp;
|
|
char fname[32];
|
|
ip_t *ip;
|
|
|
|
ip = mtod(m, ip_t *);
|
|
sprintf(fname, "/tmp/%s", ifp->name);
|
|
if ((fp = fopen(fname, "a"))) {
|
|
fwrite((char *)ip, ntohs(ip->ip_len), 1, fp);
|
|
fclose(fp);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
struct ifnet *get_unit(name, v)
|
|
char *name;
|
|
int v;
|
|
{
|
|
struct ifnet *ifp, **ifa;
|
|
char ifname[32], *s;
|
|
|
|
for (ifa = ifneta; ifa && (ifp = *ifa); ifa++) {
|
|
(void) sprintf(ifname, "%s", ifp->name);
|
|
if (!strcmp(name, ifname))
|
|
return ifp;
|
|
}
|
|
|
|
if (!ifneta) {
|
|
ifneta = (struct ifnet **)malloc(sizeof(ifp) * 2);
|
|
ifneta[1] = NULL;
|
|
ifneta[0] = (struct ifnet *)calloc(1, sizeof(*ifp));
|
|
nifs = 1;
|
|
} else {
|
|
nifs++;
|
|
ifneta = (struct ifnet **)realloc(ifneta,
|
|
(nifs + 1) * sizeof(*ifa));
|
|
ifneta[nifs] = NULL;
|
|
ifneta[nifs - 1] = (struct ifnet *)malloc(sizeof(*ifp));
|
|
}
|
|
ifp = ifneta[nifs - 1];
|
|
|
|
for (s = name; *s && !isdigit(*s); s++)
|
|
;
|
|
if (*s && isdigit(*s)) {
|
|
ifp->name = (char *)malloc(s - name + 1);
|
|
strncpy(ifp->name, name, s - name);
|
|
ifp->name[s - name] = '\0';
|
|
} else {
|
|
ifp->name = strdup(name);
|
|
}
|
|
ifp->hard_start_xmit = no_output;
|
|
return ifp;
|
|
}
|
|
|
|
|
|
|
|
void init_ifp()
|
|
{
|
|
FILE *fp;
|
|
struct ifnet *ifp, **ifa;
|
|
char fname[32];
|
|
|
|
for (ifa = ifneta; ifa && (ifp = *ifa); ifa++) {
|
|
ifp->hard_start_xmit = write_output;
|
|
sprintf(fname, "/tmp/%s", ifp->name);
|
|
if ((fp = fopen(fname, "w")))
|
|
fclose(fp);
|
|
}
|
|
}
|
|
|
|
|
|
void ipfr_fastroute(ip, fin, fdp)
|
|
ip_t *ip;
|
|
fr_info_t *fin;
|
|
frdest_t *fdp;
|
|
{
|
|
struct ifnet *ifp = fdp->fd_ifp;
|
|
|
|
if (!ifp)
|
|
return; /* no routing table out here */
|
|
|
|
ip->ip_len = htons((u_short)ip->ip_len);
|
|
ip->ip_off = htons((u_short)(ip->ip_off | IP_MF));
|
|
ip->ip_sum = 0;
|
|
(*ifp->hard_start_xmit)((mb_t *)ip, ifp);
|
|
}
|
|
|
|
|
|
int ipllog __P((void))
|
|
{
|
|
verbose("l");
|
|
return 0;
|
|
}
|
|
|
|
|
|
int send_reset(ip, ifp)
|
|
ip_t *ip;
|
|
struct ifnet *ifp;
|
|
{
|
|
verbose("- TCP RST sent\n");
|
|
return 0;
|
|
}
|
|
|
|
|
|
int icmp_error(ip, ifp)
|
|
ip_t *ip;
|
|
struct ifnet *ifp;
|
|
{
|
|
verbose("- TCP RST sent\n");
|
|
return 0;
|
|
}
|
|
#endif /* _KERNEL */
|