1100 lines
23 KiB
C
1100 lines
23 KiB
C
/*
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* (C)opyright 1993,1994,1995 by Darren Reed.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that this notice is preserved and due credit is given
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* to the original author and the contributors.
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*/
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#if !defined(lint) && defined(LIBC_SCCS)
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static char sccsid[] = "@(#)ip_fil.c 2.41 6/5/96 (C) 1993-1995 Darren Reed";
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static char rcsid[] = "$Id: ip_fil.c,v 1.1.1.3 1997/04/03 10:10:52 darrenr Exp $";
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#endif
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#ifndef SOLARIS
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#define SOLARIS (defined(sun) && (defined(__svr4__) || defined(__SVR4)))
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#endif
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#ifdef __FreeBSD__
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#include <osreldate.h>
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#endif
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#ifndef _KERNEL
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#include <stdio.h>
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#include <string.h>
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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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#ifdef _KERNEL
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#include <sys/systm.h>
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#endif
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#include <sys/uio.h>
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#if !SOLARIS
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#include <sys/dir.h>
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#include <sys/mbuf.h>
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#else
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#define bcmp memcmp
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#define bzero(a,b) memset(a,0,b)
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#define bcopy(a,b,c) memcpy(b,a,c)
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#include <sys/filio.h>
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#endif
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#include <sys/protosw.h>
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#include <sys/socket.h>
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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_var.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/tcp.h>
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#include <netinet/udp.h>
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#include <netinet/tcpip.h>
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#include <netinet/ip_icmp.h>
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#include <syslog.h>
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#include "ip_compat.h"
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#include "ip_fil.h"
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#include "ip_frag.h"
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#include "ip_nat.h"
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#include "ip_state.h"
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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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extern fr_flags, fr_active;
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extern struct protosw inetsw[];
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#if BSD < 199306
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static int (*fr_saveslowtimo) __P((void));
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extern int tcp_ttl;
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#else
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static void (*fr_saveslowtimo) __P((void));
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#endif
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int ipl_inited = 0;
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int ipl_unreach = ICMP_UNREACH_FILTER;
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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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struct ifnet *get_unit __P((char *));
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#endif
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#ifdef IPFILTER_LOG
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char iplbuf[3][IPLLOGSIZE];
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caddr_t iplh[3], iplt[3];
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int iplused[3] = {0,0,0};
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#endif /* IPFILTER_LOG */
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static void frflush __P((caddr_t));
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static int frrequest __P((int, caddr_t, int));
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static void frzerostats __P((caddr_t));
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#ifdef _KERNEL
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static int (*fr_savep) __P((struct ip *, int, struct ifnet *,
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int, struct mbuf **));
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#else
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void init_ifp __P((void));
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static int (*fr_savep) __P((struct ip *, int, struct ifnet *,
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int, char *));
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static int no_output __P((struct ifnet *, struct mbuf *,
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struct sockaddr *, struct rtentry *));
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static int write_output __P((struct ifnet *, struct mbuf *,
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struct sockaddr *, struct rtentry *));
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#endif
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#if (_BSDI_VERSION >= 199510) && defined(_KERNEL)
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# include <sys/device.h>
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# include <sys/conf.h>
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struct cfdriver iplcd = {
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NULL, "ipl", NULL, NULL, DV_DULL, 0
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};
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struct devsw iplsw = {
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&iplcd,
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iplopen, iplclose, iplread, nowrite, iplioctl, noselect, nommap,
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nostrat, nodump, nopsize, 0,
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nostop
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};
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#endif /* _BSDI_VERSION >= 199510 && _KERNEL */
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#ifdef _KERNEL
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# ifdef IPFILTER_LKM
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int iplidentify(s)
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char *s;
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{
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if (strcmp(s, "ipl") == 0)
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return 1;
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return 0;
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}
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# endif /* IPFILTER_LKM */
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int iplattach()
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{
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int s, i;
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SPLNET(s);
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if (ipl_inited || (fr_checkp == fr_check)) {
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printf("IP Filter: already initialized\n");
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SPLX(s);
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return EBUSY;
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}
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ipl_inited = 1;
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bzero((char *)nat_table, sizeof(nat_t *) * NAT_SIZE * 2);
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fr_savep = fr_checkp;
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fr_checkp = fr_check;
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fr_saveslowtimo = inetsw[0].pr_slowtimo;
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inetsw[0].pr_slowtimo = ipfr_slowtimer;
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/*
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* Set log buffer pointers for each of the log buffers
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*/
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for (i = 0; i <= 2; i++) {
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iplh[i] = iplbuf[i];
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iplt[i] = iplbuf[i];
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}
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SPLX(s);
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return 0;
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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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SPLNET(s);
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if (!ipl_inited)
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{
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printf("IP Filter: not initialized\n");
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SPLX(s);
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return EBUSY;
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}
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#if defined(IPFILTER_LKM) || defined(IPFILTER)
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fr_checkp = fr_savep;
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#endif
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inetsw[0].pr_slowtimo = fr_saveslowtimo;
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frflush((caddr_t)&i);
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ipl_inited = 0;
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ipfr_unload();
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ip_natunload();
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fr_stateunload();
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SPLX(s);
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return 0;
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}
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#endif /* _KERNEL */
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static void frzerostats(data)
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caddr_t data;
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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_active = fr_active;
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IWCOPY((caddr_t)&fio, data, sizeof(fio));
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bzero((char *)frstats, sizeof(*frstats) * 2);
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}
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static void frflush(data)
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caddr_t data;
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{
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struct frentry *f, **fp;
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int flags = *(int *)data, flushed = 0, set = fr_active;
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bzero((char *)frcache, sizeof(frcache[0]) * 2);
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if (flags & FR_INACTIVE)
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set = 1 - set;
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if (flags & FR_OUTQUE) {
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for (fp = &ipfilter[1][set]; (f = *fp); ) {
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*fp = f->fr_next;
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KFREE(f);
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flushed++;
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}
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for (fp = &ipacct[1][set]; (f = *fp); ) {
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*fp = f->fr_next;
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KFREE(f);
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flushed++;
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}
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}
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if (flags & FR_INQUE) {
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for (fp = &ipfilter[0][set]; (f = *fp); ) {
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*fp = f->fr_next;
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KFREE(f);
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flushed++;
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}
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for (fp = &ipacct[0][set]; (f = *fp); ) {
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*fp = f->fr_next;
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KFREE(f);
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flushed++;
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}
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}
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*(int *)data = flushed;
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}
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/*
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* Filter ioctl interface.
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*/
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int iplioctl(dev, cmd, data, mode
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#if ((_BSDI_VERSION >= 199510) || (BSD >= 199506)) && defined(_KERNEL)
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, p)
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struct proc *p;
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#else
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)
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#endif
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dev_t dev;
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int cmd;
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caddr_t data;
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int mode;
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{
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int error = 0, s, unit;
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#ifdef _KERNEL
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unit = minor(dev);
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if ((2 < unit) || (unit < 0))
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return ENXIO;
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#endif
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SPLNET(s);
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switch (cmd) {
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case FIONREAD :
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#ifdef IPFILTER_LOG
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*(int *)data = iplused[unit];
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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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IRCOPY(data, (caddr_t)&enable, sizeof(enable));
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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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IRCOPY(data, (caddr_t)&fr_flags, sizeof(fr_flags));
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break;
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case SIOCGETFF :
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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(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(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_active = fr_active;
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IWCOPY((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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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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frflush(data);
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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 = iplused[unit];
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iplh[unit] = iplt[unit] = iplbuf[unit];
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iplused[unit] = 0;
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}
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break;
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#endif /* IPFILTER_LOG */
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case SIOCADNAT :
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case SIOCRMNAT :
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case SIOCGNATS :
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case SIOCGNATL :
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case SIOCFLNAT :
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case SIOCCNATL :
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error = nat_ioctl(data, cmd, mode);
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break;
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case SIOCGFRST :
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IWCOPY((caddr_t)ipfr_fragstats(), data, sizeof(ipfrstat_t));
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break;
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case SIOCGIPST :
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IWCOPY((caddr_t)fr_statetstats(), data, sizeof(ips_stat_t));
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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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SPLX(s);
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return error;
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}
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static int frrequest(req, data, set)
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int req, 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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int error = 0, in;
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fp = &frd;
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IRCOPY(data, (caddr_t)fp, sizeof(*fp));
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in = (fp->fr_flags & FR_INQUE) ? 0 : 1;
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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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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);
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if (!fp->fr_ifa)
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fp->fr_ifa = (struct ifnet *)-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);
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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);
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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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IWCOPY((caddr_t)f, data, sizeof(*f));
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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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ftail = fprev;
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if (req != SIOCINAFR && req != SIOCINIFR)
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while ((f = *ftail))
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ftail = &f->fr_next;
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else 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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f = NULL;
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}
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if (req == SIOCDELFR || req == SIOCRMIFR) {
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if (!f)
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error = ESRCH;
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else {
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*ftail = f->fr_next;
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(void) 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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KMALLOC(f, frentry_t *, sizeof(*f));
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if (f != NULL) {
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bcopy((char *)fp, (char *)f, sizeof(*f));
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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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} 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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#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(dev, flags
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#if ((_BSDI_VERSION >= 199510) || (BSD >= 199506)) && defined(_KERNEL)
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, devtype, p)
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int devtype;
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struct proc *p;
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# else
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)
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# endif
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dev_t dev;
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int flags;
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{
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u_int min = minor(dev);
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if (2 < min)
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min = ENXIO;
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else
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min = 0;
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return min;
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}
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int iplclose(dev, flags
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#if ((_BSDI_VERSION >= 199510) || (BSD >= 199506)) && defined(_KERNEL)
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, devtype, p)
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int devtype;
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struct proc *p;
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# else
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)
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# endif
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dev_t dev;
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int flags;
|
|
{
|
|
u_int min = minor(dev);
|
|
|
|
if (2 < min)
|
|
min = ENXIO;
|
|
else
|
|
min = 0;
|
|
return min;
|
|
}
|
|
|
|
# ifdef IPFILTER_LOG
|
|
/*
|
|
* 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.
|
|
*/
|
|
# if BSD >= 199306
|
|
int iplread(dev, uio, ioflag)
|
|
int ioflag;
|
|
# else
|
|
int iplread(dev, uio)
|
|
# endif
|
|
dev_t dev;
|
|
register struct uio *uio;
|
|
{
|
|
register int ret, s, unit;
|
|
register size_t sz, sx;
|
|
int error;
|
|
|
|
unit = minor(dev);
|
|
if ((2 < unit) || (unit < 0))
|
|
return ENXIO;
|
|
|
|
if (!uio->uio_resid)
|
|
return 0;
|
|
|
|
while (!iplused[unit]) {
|
|
error = SLEEP(iplbuf[unit], "ipl sleep");
|
|
if (error)
|
|
return error;
|
|
}
|
|
SPLNET(s);
|
|
|
|
sx = sz = MIN(uio->uio_resid, iplused[unit]);
|
|
if (iplh[unit] < iplt[unit])
|
|
sz = MIN(sz, IPLLOGSIZE - (iplt[unit] - iplbuf[unit]));
|
|
sx -= sz;
|
|
|
|
# if BSD >= 199306 || defined(__FreeBSD__)
|
|
uio->uio_rw = UIO_READ;
|
|
# endif
|
|
if (!(ret = UIOMOVE(iplt[unit], sz, UIO_READ, uio))) {
|
|
iplt[unit] += sz;
|
|
iplused[unit] -= sz;
|
|
if ((iplh[unit] < iplt[unit]) && (iplt[unit] == iplbuf[unit] + IPLLOGSIZE))
|
|
iplt[unit] = iplbuf[unit];
|
|
|
|
if (sx && !(ret = UIOMOVE(iplt[unit], sx, UIO_READ, uio))) {
|
|
iplt[unit] += sx;
|
|
iplused[unit] -= sx;
|
|
if ((iplh[unit] < iplt[unit]) && (iplt[unit] == iplbuf[unit] + IPLLOGSIZE))
|
|
iplt[unit] = iplbuf[unit];
|
|
}
|
|
if (!iplused[unit]) /* minimise wrapping around the end */
|
|
iplh[unit] = iplt[unit] = iplbuf[unit];
|
|
}
|
|
SPLX(s);
|
|
return ret;
|
|
}
|
|
# endif /* IPFILTER_LOG */
|
|
|
|
|
|
# ifdef IPFILTER_LOG
|
|
int ipllog(flags, dev, ip, fin, m)
|
|
u_int flags;
|
|
int dev;
|
|
ip_t *ip;
|
|
register fr_info_t *fin;
|
|
struct mbuf *m;
|
|
{
|
|
struct ipl_ci iplci;
|
|
register int len, mlen, hlen;
|
|
struct ifnet *ifp = fin->fin_ifp;
|
|
|
|
hlen = fin->fin_hlen;
|
|
if (ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP)
|
|
hlen += MIN(sizeof(tcphdr_t), fin->fin_dlen);
|
|
else if (ip->ip_p == IPPROTO_ICMP) {
|
|
struct icmp *icmp = (struct icmp *)((char *)ip + hlen);
|
|
|
|
switch (icmp->icmp_type) {
|
|
case ICMP_UNREACH :
|
|
case ICMP_SOURCEQUENCH :
|
|
case ICMP_REDIRECT :
|
|
case ICMP_TIMXCEED :
|
|
case ICMP_PARAMPROB :
|
|
hlen += MIN(sizeof(struct icmp) + 8, fin->fin_dlen);
|
|
break;
|
|
default :
|
|
hlen += MIN(sizeof(struct icmp), fin->fin_dlen);
|
|
break;
|
|
}
|
|
}
|
|
|
|
mlen = (flags & FR_LOGBODY) ? MIN(ip->ip_len - hlen, 128) : 0;
|
|
len = hlen + sizeof(iplci) + mlen;
|
|
if (iplused[dev] + len > IPLLOGSIZE)
|
|
return 0;
|
|
iplused[dev] += len;
|
|
|
|
# ifdef sun
|
|
uniqtime(&iplci);
|
|
# endif
|
|
# if BSD >= 199306 || defined(__FreeBSD__)
|
|
microtime((struct timeval *)&iplci);
|
|
# endif
|
|
iplci.flags = flags;
|
|
iplci.hlen = (u_char)hlen;
|
|
iplci.plen = (u_char)mlen;
|
|
iplci.rule = fin->fin_rule;
|
|
# if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199603))
|
|
strncpy(iplci.ifname, ifp->if_xname, IFNAMSIZ);
|
|
# else
|
|
iplci.unit = (u_char)ifp->if_unit;
|
|
if ((iplci.ifname[0] = ifp->if_name[0]))
|
|
if ((iplci.ifname[1] = ifp->if_name[1]))
|
|
if ((iplci.ifname[2] = ifp->if_name[2]))
|
|
iplci.ifname[3] = ifp->if_name[3];
|
|
# endif
|
|
if (iplh[dev] == iplbuf[dev] + IPLLOGSIZE)
|
|
iplh[dev] = iplbuf[dev];
|
|
|
|
/*
|
|
* Gauranteed to succeed from above
|
|
*/
|
|
(void) fr_copytolog(dev, (char *)&iplci, sizeof(iplci));
|
|
|
|
for (len -= sizeof(iplci); m && len > 0; m = m->m_next, len -= hlen) {
|
|
hlen = MIN(len, m->m_len);
|
|
if (fr_copytolog(dev, mtod(m, char *), hlen))
|
|
break;
|
|
}
|
|
|
|
wakeup(iplbuf[dev]);
|
|
return 1;
|
|
}
|
|
# endif /* IPFILTER_LOG */
|
|
|
|
/*
|
|
* 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)
|
|
struct tcpiphdr *ti;
|
|
{
|
|
struct tcpiphdr *tp;
|
|
struct ip *ip;
|
|
struct tcphdr *tcp;
|
|
struct mbuf *m;
|
|
int tlen = 0;
|
|
|
|
if (ti->ti_flags & TH_RST)
|
|
return -1; /* feedback loop */
|
|
# if BSD < 199306
|
|
m = m_get(M_DONTWAIT, MT_HEADER);
|
|
# else
|
|
m = m_gethdr(M_DONTWAIT, MT_HEADER);
|
|
m->m_data += max_linkhdr;
|
|
# endif
|
|
if (m == NULL)
|
|
return -1;
|
|
|
|
if (ti->ti_flags & TH_SYN)
|
|
tlen = 1;
|
|
m->m_len = sizeof (struct tcpiphdr);
|
|
# if BSD >= 199306
|
|
m->m_pkthdr.len = sizeof (struct tcpiphdr);
|
|
m->m_pkthdr.rcvif = (struct ifnet *)0;
|
|
# endif
|
|
bzero(mtod(m, char *), sizeof(struct tcpiphdr));
|
|
ip = mtod(m, struct ip *);
|
|
tp = mtod(m, struct tcpiphdr *);
|
|
tcp = (struct tcphdr *)((char *)ip + sizeof(struct ip));
|
|
|
|
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(struct tcphdr) >> 2;
|
|
tcp->th_flags = TH_RST|TH_ACK;
|
|
tp->ti_pr = ((struct ip *)ti)->ip_p;
|
|
tp->ti_len = htons(sizeof(struct tcphdr));
|
|
tcp->th_sum = in_cksum(m, sizeof(struct tcpiphdr));
|
|
|
|
ip->ip_tos = ((struct ip *)ti)->ip_tos;
|
|
ip->ip_p = ((struct ip *)ti)->ip_p;
|
|
ip->ip_len = sizeof (struct tcpiphdr);
|
|
# if BSD < 199306
|
|
ip->ip_ttl = tcp_ttl;
|
|
# else
|
|
ip->ip_ttl = ip_defttl;
|
|
# endif
|
|
|
|
/*
|
|
* extra 0 in case of multicast
|
|
*/
|
|
(void) ip_output(m, (struct mbuf *)0, 0, 0, 0);
|
|
return 0;
|
|
}
|
|
|
|
|
|
# ifndef IPFILTER_LKM
|
|
# if BSD < 199306
|
|
int
|
|
# else
|
|
void
|
|
# endif
|
|
iplinit()
|
|
{
|
|
(void) iplattach();
|
|
ip_init();
|
|
}
|
|
# endif
|
|
|
|
|
|
void ipfr_fastroute(m0, fin, fdp)
|
|
struct mbuf *m0;
|
|
fr_info_t *fin;
|
|
frdest_t *fdp;
|
|
{
|
|
register struct ip *ip, *mhip;
|
|
register struct mbuf *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, struct ip *);
|
|
/*
|
|
* 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;
|
|
#ifdef __bsdi__
|
|
dst->sin_len = sizeof(*dst);
|
|
#endif
|
|
#if (BSD >= 199306) && !defined(__NetBSD__) && !defined(__bsdi__)
|
|
# ifdef RTF_CLONING
|
|
rtalloc_ign(ro, RTF_CLONING);
|
|
# else
|
|
rtalloc_ign(ro, RTF_PRCLONING);
|
|
# endif
|
|
# else
|
|
rtalloc(ro);
|
|
# endif
|
|
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);
|
|
# if BSD >= 199306
|
|
error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst,
|
|
ro->ro_rt);
|
|
# else
|
|
error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst);
|
|
# endif
|
|
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;
|
|
struct mbuf **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;
|
|
}
|
|
# if BSD >= 199306
|
|
m->m_data += max_linkhdr;
|
|
# else
|
|
m->m_off = MMAXOFF - hlen;
|
|
# endif
|
|
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)
|
|
# if BSD >= 199306
|
|
error = (*ifp->if_output)(ifp, m,
|
|
(struct sockaddr *)dst, ro->ro_rt);
|
|
# else
|
|
error = (*ifp->if_output)(ifp, m,
|
|
(struct sockaddr *)dst);
|
|
# endif
|
|
else
|
|
m_freem(m);
|
|
}
|
|
}
|
|
done:
|
|
if (ro->ro_rt) {
|
|
RTFREE(ro->ro_rt);
|
|
}
|
|
return;
|
|
bad:
|
|
m_freem(m);
|
|
goto done;
|
|
}
|
|
#else /* #ifdef _KERNEL */
|
|
|
|
|
|
static int no_output __P((struct ifnet *ifp, struct mbuf *m,
|
|
struct sockaddr *s, struct rtentry *rt))
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
|
|
# ifdef __STDC__
|
|
static int write_output __P((struct ifnet *ifp, struct mbuf *m,
|
|
struct sockaddr *s, struct rtentry *rt))
|
|
{
|
|
ip_t *ip = (ip_t *)m;
|
|
# else
|
|
static int write_output(ifp, ip)
|
|
struct ifnet *ifp;
|
|
ip_t *ip;
|
|
{
|
|
# endif
|
|
FILE *fp;
|
|
char fname[32];
|
|
|
|
#if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199606))
|
|
sprintf(fname, "/tmp/%s", ifp->if_xname);
|
|
if ((fp = fopen(fname, "a"))) {
|
|
fclose(fp);
|
|
}
|
|
#else
|
|
sprintf(fname, "/tmp/%s%d", ifp->if_name, ifp->if_unit);
|
|
if ((fp = fopen(fname, "a"))) {
|
|
fwrite((char *)ip, ntohs(ip->ip_len), 1, fp);
|
|
fclose(fp);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
|
|
struct ifnet *get_unit(name)
|
|
char *name;
|
|
{
|
|
struct ifnet *ifp, **ifa;
|
|
#if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199606))
|
|
for (ifa = ifneta; ifa && (ifp = *ifa); ifa++) {
|
|
if (!strcmp(name, ifp->if_xname))
|
|
return ifp;
|
|
}
|
|
#else
|
|
char ifname[32], *s;
|
|
|
|
for (ifa = ifneta; ifa && (ifp = *ifa); ifa++) {
|
|
(void) sprintf(ifname, "%s%d", ifp->if_name, ifp->if_unit);
|
|
if (!strcmp(name, ifname))
|
|
return ifp;
|
|
}
|
|
#endif
|
|
|
|
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];
|
|
|
|
#if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199606))
|
|
strncpy(ifp->if_xname, name, sizeof(ifp->if_xname));
|
|
#else
|
|
for (s = name; *s && !isdigit(*s); s++)
|
|
;
|
|
if (*s && isdigit(*s)) {
|
|
ifp->if_unit = atoi(s);
|
|
ifp->if_name = (char *)malloc(s - name + 1);
|
|
strncpy(ifp->if_name, name, s - name);
|
|
ifp->if_name[s - name] = '\0';
|
|
} else {
|
|
ifp->if_name = strdup(name);
|
|
ifp->if_unit = -1;
|
|
}
|
|
#endif
|
|
ifp->if_output = no_output;
|
|
return ifp;
|
|
}
|
|
|
|
|
|
void init_ifp()
|
|
{
|
|
FILE *fp;
|
|
struct ifnet *ifp, **ifa;
|
|
char fname[32];
|
|
#if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199606))
|
|
for (ifa = ifneta; ifa && (ifp = *ifa); ifa++) {
|
|
ifp->if_output = write_output;
|
|
sprintf(fname, "/tmp/%s", ifp->if_xname);
|
|
if ((fp = fopen(fname, "w")))
|
|
fclose(fp);
|
|
}
|
|
#else
|
|
|
|
for (ifa = ifneta; ifa && (ifp = *ifa); ifa++) {
|
|
ifp->if_output = write_output;
|
|
sprintf(fname, "/tmp/%s%d", ifp->if_name, ifp->if_unit);
|
|
if ((fp = fopen(fname, "w")))
|
|
fclose(fp);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
|
|
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->if_output)(ifp, (void *)ip, NULL, 0);
|
|
}
|
|
|
|
|
|
void ipllog()
|
|
{
|
|
verbose("l");
|
|
}
|
|
|
|
|
|
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 */
|