diff options
Diffstat (limited to 'contrib/ipfilter/ip_fil.c')
| -rw-r--r-- | contrib/ipfilter/ip_fil.c | 1147 |
1 files changed, 1147 insertions, 0 deletions
diff --git a/contrib/ipfilter/ip_fil.c b/contrib/ipfilter/ip_fil.c new file mode 100644 index 0000000..b79c030 --- /dev/null +++ b/contrib/ipfilter/ip_fil.c @@ -0,0 +1,1147 @@ +/* + * (C)opyright 1993-1997 by Darren Reed. + * + * Redistribution and use in source and binary forms are permitted + * provided that this notice is preserved and due credit is given + * to the original author and the contributors. + */ +#if !defined(lint) && defined(LIBC_SCCS) +static char sccsid[] = "@(#)ip_fil.c 2.41 6/5/96 (C) 1993-1995 Darren Reed"; +static char rcsid[] = "$Id: ip_fil.c,v 2.0.2.12 1997/05/24 07:39:56 darrenr Exp $"; +#endif + +#ifndef SOLARIS +#define SOLARIS (defined(sun) && (defined(__svr4__) || defined(__SVR4))) +#endif + +#ifdef __FreeBSD__ +# if defined(KERNEL) && !defined(_KERNEL) +# define _KERNEL +# endif +# if defined(_KERNEL) && !defined(IPFILTER_LKM) +# include <sys/osreldate.h> +# else +# include <osreldate.h> +# endif +#endif +#ifndef _KERNEL +#include <stdio.h> +#include <string.h> +#endif +#include <sys/errno.h> +#include <sys/types.h> +#include <sys/param.h> +#include <sys/file.h> +#if __FreeBSD_version >= 220000 && defined(_KERNEL) +# include <sys/fcntl.h> +# include <sys/filio.h> +#else +# include <sys/ioctl.h> +#endif +#include <sys/time.h> +#ifdef _KERNEL +#include <sys/systm.h> +#endif +#include <sys/uio.h> +#if !SOLARIS +#include <sys/dir.h> +#include <sys/mbuf.h> +#else +#include <sys/filio.h> +#endif +#include <sys/protosw.h> +#include <sys/socket.h> + +#include <net/if.h> +#ifdef sun +#include <net/af.h> +#endif +#if __FreeBSD_version >= 300000 +# include <net/if_var.h> +#endif +#include <net/route.h> +#include <netinet/in.h> +#include <netinet/in_var.h> +#include <netinet/in_systm.h> +#include <netinet/ip.h> +#include <netinet/ip_var.h> +#include <netinet/tcp.h> +#include <netinet/udp.h> +#include <netinet/tcpip.h> +#include <netinet/ip_icmp.h> +#ifndef _KERNEL +# include <syslog.h> +#endif +#include "netinet/ip_compat.h" +#include "netinet/ip_fil.h" +#include "netinet/ip_proxy.h" +#include "netinet/ip_nat.h" +#include "netinet/ip_frag.h" +#include "netinet/ip_state.h" +#ifndef MIN +#define MIN(a,b) (((a)<(b))?(a):(b)) +#endif +#if !SOLARIS && defined(_KERNEL) +extern int ip_optcopy __P((struct ip *, struct ip *)); +#endif + + +extern struct protosw inetsw[]; +#if BSD < 199306 +static int (*fr_saveslowtimo) __P((void)); +extern int tcp_ttl; +#else +static void (*fr_saveslowtimo) __P((void)); +#endif + +int ipl_inited = 0; +int ipl_unreach = ICMP_UNREACH_FILTER; + +#ifndef _KERNEL +#include "ipt.h" +static struct ifnet **ifneta = NULL; +static int nifs = 0; +struct ifnet *get_unit __P((char *)); +#endif + +#ifdef IPFILTER_LOG +char iplbuf[3][IPLLOGSIZE]; +caddr_t iplh[3], iplt[3]; +int iplused[3] = {0,0,0}; +#endif /* IPFILTER_LOG */ +static void frflush __P((caddr_t)); +static int frrequest __P((int, caddr_t, int)); +static void frzerostats __P((caddr_t)); +#ifdef _KERNEL +static int (*fr_savep) __P((struct ip *, int, struct ifnet *, + int, struct mbuf **)); +#else +void init_ifp __P((void)); +static int (*fr_savep) __P((struct ip *, int, struct ifnet *, + int, char *)); +static int no_output __P((struct ifnet *, struct mbuf *, + struct sockaddr *, struct rtentry *)); +static int write_output __P((struct ifnet *, struct mbuf *, + struct sockaddr *, struct rtentry *)); +#endif + + +#if (_BSDI_VERSION >= 199510) && defined(_KERNEL) +# include <sys/device.h> +# include <sys/conf.h> + +struct cfdriver iplcd = { + NULL, "ipl", NULL, NULL, DV_DULL, 0 +}; + +struct devsw iplsw = { + &iplcd, + iplopen, iplclose, iplread, nowrite, iplioctl, noselect, nommap, + nostrat, nodump, nopsize, 0, + nostop +}; +#endif /* _BSDI_VERSION >= 199510 && _KERNEL */ + + +#ifdef _KERNEL +# ifdef IPFILTER_LKM +int iplidentify(s) +char *s; +{ + if (strcmp(s, "ipl") == 0) + return 1; + return 0; +} +# endif /* IPFILTER_LKM */ + + +int iplattach() +{ + char *defpass; + int s, i; + + SPLNET(s); + if (ipl_inited || (fr_checkp == fr_check)) { + printf("IP Filter: already initialized\n"); + SPLX(s); + return EBUSY; + } + ipl_inited = 1; + bzero((char *)nat_table, sizeof(nat_t *) * NAT_SIZE * 2); + fr_savep = fr_checkp; + fr_checkp = fr_check; + fr_saveslowtimo = inetsw[0].pr_slowtimo; + inetsw[0].pr_slowtimo = ipfr_slowtimer; + + /* + * Set log buffer pointers for each of the log buffers + */ +#ifdef IPFILTER_LOG + for (i = 0; i <= 2; i++) { + iplh[i] = iplbuf[i]; + iplt[i] = iplbuf[i]; + } +#endif + SPLX(s); + if (fr_pass & FR_PASS) + defpass = "pass"; + else if (fr_pass & FR_BLOCK) + defpass = "block"; + else + defpass = "no-match -> block"; + + printf("IP Filter: initialized. Default = %s all\n", defpass); + return 0; +} + + +int ipldetach() +{ + int s, i = FR_INQUE|FR_OUTQUE; + + SPLNET(s); + if (!ipl_inited) + { + printf("IP Filter: not initialized\n"); + SPLX(s); + return EBUSY; + } + +#if defined(IPFILTER_LKM) || defined(IPFILTER) + fr_checkp = fr_savep; +#endif + inetsw[0].pr_slowtimo = fr_saveslowtimo; + frflush((caddr_t)&i); + ipl_inited = 0; + + ipfr_unload(); + ip_natunload(); + fr_stateunload(); + + SPLX(s); + return 0; +} +#endif /* _KERNEL */ + + +static void frzerostats(data) +caddr_t data; +{ + struct friostat fio; + + bcopy((char *)frstats, (char *)fio.f_st, + sizeof(struct filterstats) * 2); + fio.f_fin[0] = ipfilter[0][0]; + fio.f_fin[1] = ipfilter[0][1]; + fio.f_fout[0] = ipfilter[1][0]; + fio.f_fout[1] = ipfilter[1][1]; + fio.f_acctin[0] = ipacct[0][0]; + fio.f_acctin[1] = ipacct[0][1]; + fio.f_acctout[0] = ipacct[1][0]; + fio.f_acctout[1] = ipacct[1][1]; + fio.f_active = fr_active; + IWCOPY((caddr_t)&fio, data, sizeof(fio)); + bzero((char *)frstats, sizeof(*frstats) * 2); +} + + +static void frflush(data) +caddr_t data; +{ + struct frentry *f, **fp; + int flags = *(int *)data, flushed = 0, set = fr_active; + + bzero((char *)frcache, sizeof(frcache[0]) * 2); + + if (flags & FR_INACTIVE) + set = 1 - set; + if (flags & FR_OUTQUE) { + for (fp = &ipfilter[1][set]; (f = *fp); ) { + *fp = f->fr_next; + KFREE(f); + flushed++; + } + for (fp = &ipacct[1][set]; (f = *fp); ) { + *fp = f->fr_next; + KFREE(f); + flushed++; + } + } + if (flags & FR_INQUE) { + for (fp = &ipfilter[0][set]; (f = *fp); ) { + *fp = f->fr_next; + KFREE(f); + flushed++; + } + for (fp = &ipacct[0][set]; (f = *fp); ) { + *fp = f->fr_next; + KFREE(f); + flushed++; + } + } + *(int *)data = flushed; +} + + +/* + * Filter ioctl interface. + */ +int iplioctl(dev, cmd, data, mode +#if ((_BSDI_VERSION >= 199510) || (BSD >= 199506) || (NetBSD >= 199511) || \ + (__FreeBSD_version >= 220000)) && defined(_KERNEL) +, p) +struct proc *p; +#else +) +#endif +dev_t dev; +int cmd; +caddr_t data; +int mode; +{ + int error = 0, s, unit; + +#ifdef _KERNEL + unit = minor(dev); + if ((2 < unit) || (unit < 0)) + return ENXIO; +#endif + + SPLNET(s); + + if (unit == IPL_LOGNAT) { + error = nat_ioctl(data, cmd, mode); + SPLX(s); + return error; + } + if (unit == IPL_LOGSTATE) { + error = fr_state_ioctl(data, cmd, mode); + SPLX(s); + return error; + } + switch (cmd) { + case FIONREAD : +#ifdef IPFILTER_LOG + *(int *)data = iplused[IPL_LOGIPF]; +#endif + break; +#if !defined(IPFILTER_LKM) && defined(_KERNEL) + case SIOCFRENB : + { + u_int enable; + + if (!(mode & FWRITE)) + error = EPERM; + else { + IRCOPY(data, (caddr_t)&enable, sizeof(enable)); + if (enable) + error = iplattach(); + else + error = ipldetach(); + } + break; + } +#endif + case SIOCSETFF : + if (!(mode & FWRITE)) + error = EPERM; + else + IRCOPY(data, (caddr_t)&fr_flags, sizeof(fr_flags)); + break; + case SIOCGETFF : + IWCOPY((caddr_t)&fr_flags, data, sizeof(fr_flags)); + break; + case SIOCINAFR : + case SIOCRMAFR : + case SIOCADAFR : + case SIOCZRLST : + if (!(mode & FWRITE)) + error = EPERM; + else + error = frrequest(cmd, data, fr_active); + break; + case SIOCINIFR : + case SIOCRMIFR : + case SIOCADIFR : + if (!(mode & FWRITE)) + error = EPERM; + else + error = frrequest(cmd, data, 1 - fr_active); + break; + case SIOCSWAPA : + if (!(mode & FWRITE)) + error = EPERM; + else { + bzero((char *)frcache, sizeof(frcache[0]) * 2); + *(u_int *)data = fr_active; + fr_active = 1 - fr_active; + } + break; + case SIOCGETFS : + { + struct friostat fio; + + bcopy((char *)frstats, (char *)fio.f_st, + sizeof(struct filterstats) * 2); + fio.f_fin[0] = ipfilter[0][0]; + fio.f_fin[1] = ipfilter[0][1]; + fio.f_fout[0] = ipfilter[1][0]; + fio.f_fout[1] = ipfilter[1][1]; + fio.f_acctin[0] = ipacct[0][0]; + fio.f_acctin[1] = ipacct[0][1]; + fio.f_acctout[0] = ipacct[1][0]; + fio.f_acctout[1] = ipacct[1][1]; + fio.f_active = fr_active; + IWCOPY((caddr_t)&fio, data, sizeof(fio)); + break; + } + case SIOCFRZST : + if (!(mode & FWRITE)) + error = EPERM; + else + frzerostats(data); + break; + case SIOCIPFFL : + if (!(mode & FWRITE)) + error = EPERM; + else + frflush(data); + break; +#ifdef IPFILTER_LOG + case SIOCIPFFB : + if (!(mode & FWRITE)) + error = EPERM; + else { + *(int *)data = iplused[unit]; + iplh[unit] = iplt[unit] = iplbuf[unit]; + iplused[unix] = 0; + } + break; +#endif /* IPFILTER_LOG */ + case SIOCGFRST : + IWCOPY((caddr_t)ipfr_fragstats(), data, sizeof(ipfrstat_t)); + break; + default : + error = EINVAL; + break; + } + SPLX(s); + return error; +} + + +static int frrequest(req, data, set) +int req, set; +caddr_t data; +{ + register frentry_t *fp, *f, **fprev; + register frentry_t **ftail; + frentry_t frd; + frdest_t *fdp; + int error = 0, in; + + fp = &frd; + IRCOPY(data, (caddr_t)fp, sizeof(*fp)); + + in = (fp->fr_flags & FR_INQUE) ? 0 : 1; + if (fp->fr_flags & FR_ACCOUNT) { + ftail = fprev = &ipacct[in][set]; + } else if (fp->fr_flags & (FR_OUTQUE|FR_INQUE)) + ftail = fprev = &ipfilter[in][set]; + else + return ESRCH; + + bzero((char *)frcache, sizeof(frcache[0]) * 2); + + if (*fp->fr_ifname) { + fp->fr_ifa = GETUNIT(fp->fr_ifname); + if (!fp->fr_ifa) + fp->fr_ifa = (struct ifnet *)-1; + } + + fdp = &fp->fr_dif; + fp->fr_flags &= ~FR_DUP; + if (*fdp->fd_ifname) { + fdp->fd_ifp = GETUNIT(fdp->fd_ifname); + if (!fdp->fd_ifp) + fdp->fd_ifp = (struct ifnet *)-1; + else + fp->fr_flags |= FR_DUP; + } + + fdp = &fp->fr_tif; + if (*fdp->fd_ifname) { + fdp->fd_ifp = GETUNIT(fdp->fd_ifname); + if (!fdp->fd_ifp) + fdp->fd_ifp = (struct ifnet *)-1; + } + + /* + * Look for a matching filter rule, but don't include the next or + * interface pointer in the comparison (fr_next, fr_ifa). + */ + for (; (f = *ftail); ftail = &f->fr_next) + if (bcmp((char *)&f->fr_ip, (char *)&fp->fr_ip, + FR_CMPSIZ) == 0) + break; + + /* + * If zero'ing statistics, copy current to caller and zero. + */ + if (req == SIOCZRLST) { + if (!f) + return ESRCH; + IWCOPY((caddr_t)f, data, sizeof(*f)); + f->fr_hits = 0; + f->fr_bytes = 0; + return 0; + } + + if (!f) { + ftail = fprev; + if (req != SIOCINAFR && req != SIOCINIFR) + while ((f = *ftail)) + ftail = &f->fr_next; + else if (fp->fr_hits) + while (--fp->fr_hits && (f = *ftail)) + ftail = &f->fr_next; + f = NULL; + } + + if (req == SIOCDELFR || req == SIOCRMIFR) { + if (!f) + error = ESRCH; + else { + *ftail = f->fr_next; + (void) KFREE(f); + } + } else { + if (f) + error = EEXIST; + else { + KMALLOC(f, frentry_t *, sizeof(*f)); + if (f != NULL) { + bcopy((char *)fp, (char *)f, sizeof(*f)); + f->fr_hits = 0; + f->fr_next = *ftail; + *ftail = f; + } else + error = ENOMEM; + } + } + return (error); +} + + +#ifdef _KERNEL +/* + * routines below for saving IP headers to buffer + */ +int iplopen(dev, flags +#if ((_BSDI_VERSION >= 199510) || (BSD >= 199506) || (NetBSD >= 199511) || \ + (__FreeBSD_version >= 220000)) && defined(_KERNEL) +, devtype, p) +int devtype; +struct proc *p; +# else +) +# endif +dev_t dev; +int flags; +{ + u_int min = minor(dev); + + if (2 < min) + min = ENXIO; + else + min = 0; + return min; +} + + +int iplclose(dev, flags +#if ((_BSDI_VERSION >= 199510) || (BSD >= 199506) || (NetBSD >= 199511) || \ + (__FreeBSD_version >= 220000)) && defined(_KERNEL) +, devtype, p) +int devtype; +struct proc *p; +# else +) +# endif +dev_t dev; +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 defined(__FreeBSD_version) && (__FreeBSD_version >= 220000) + struct route ro; +#endif + + 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 defined(__FreeBSD_version) && (__FreeBSD_version >= 220000) +#endif + + 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 + +#if defined(__FreeBSD_version) && (__FreeBSD_version >= 220000) + bzero((char *)&ro, sizeof(ro)); + (void) ip_output(m, (struct mbuf *)0, &ro, 0, 0); + if (ro.ro_rt) + RTFREE(ro.ro_rt); +#else + /* + * extra 0 in case of multicast + */ + (void) ip_output(m, (struct mbuf *)0, 0, 0, 0); +#endif + return 0; +} + + +# if !defined(IPFILTER_LKM) && !(__FreeBSD_version >= 300000) +# if BSD < 199306 +int iplinit __P((void)); + +int +# else +void iplinit __P((void)); + +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 */ |
