version 1.75, 1998/12/18 21:35:11 |
version 1.83, 1999/04/07 02:31:05 |
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/* $NetBSD$ */ |
/* $NetBSD$ */ |
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/*- |
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* Copyright (c) 1998 The NetBSD Foundation, Inc. |
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* All rights reserved. |
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* |
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* This code is derived from software contributed to The NetBSD Foundation |
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* by Public Access Networks Corporation ("Panix"). It was developed under |
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* contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. All advertising materials mentioning features or use of this software |
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* must display the following acknowledgement: |
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* This product includes software developed by the NetBSD |
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* Foundation, Inc. and its contributors. |
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* 4. Neither the name of The NetBSD Foundation nor the names of its |
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* contributors may be used to endorse or promote products derived |
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* from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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/* |
/* |
* Copyright (c) 1982, 1986, 1988, 1993 |
* Copyright (c) 1982, 1986, 1988, 1993 |
* The Regents of the University of California. All rights reserved. |
* The Regents of the University of California. All rights reserved. |
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* @(#)ip_input.c 8.2 (Berkeley) 1/4/94 |
* @(#)ip_input.c 8.2 (Berkeley) 1/4/94 |
*/ |
*/ |
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/*- |
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* Copyright (c) 1998 The NetBSD Foundation, Inc. |
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* All rights reserved. |
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* |
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* This code is derived from software contributed to The NetBSD Foundation |
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* by Public Access Networks Corporation ("Panix"). It was developed under |
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* contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon. |
|
* |
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* Redistribution and use in source and binary forms, with or without |
|
* modification, are permitted provided that the following conditions |
|
* are met: |
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* 1. Redistributions of source code must retain the above copyright |
|
* notice, this list of conditions and the following disclaimer. |
|
* 2. Redistributions in binary form must reproduce the above copyright |
|
* notice, this list of conditions and the following disclaimer in the |
|
* documentation and/or other materials provided with the distribution. |
|
* 3. All advertising materials mentioning features or use of this software |
|
* must display the following acknowledgement: |
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* This product includes software developed by the NetBSD |
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* Foundation, Inc. and its contributors. |
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* 4. Neither the name of The NetBSD Foundation nor the names of its |
|
* contributors may be used to endorse or promote products derived |
|
* from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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#include "opt_gateway.h" |
#include "opt_gateway.h" |
#include "opt_pfil_hooks.h" |
#include "opt_pfil_hooks.h" |
#include "opt_mrouting.h" |
#include "opt_mrouting.h" |
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} |
} |
ip = mtod(m, struct ip *); |
ip = mtod(m, struct ip *); |
} |
} |
if ((ip->ip_sum = in_cksum(m, hlen)) != 0) { |
if (in_cksum(m, hlen) != 0) { |
ipstat.ips_badsum++; |
ipstat.ips_badsum++; |
goto bad; |
goto bad; |
} |
} |
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* Convert fields to host representation. |
* Convert fields to host representation. |
*/ |
*/ |
NTOHS(ip->ip_len); |
NTOHS(ip->ip_len); |
NTOHS(ip->ip_id); |
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NTOHS(ip->ip_off); |
NTOHS(ip->ip_off); |
len = ip->ip_len; |
len = ip->ip_len; |
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/* |
/* |
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* Check for additional length bogosity |
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*/ |
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if (len < hlen) |
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{ |
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ipstat.ips_badlen++; |
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goto bad; |
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} |
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/* |
* Check that the amount of data in the buffers |
* Check that the amount of data in the buffers |
* is as at least much as the IP header would have us expect. |
* is as at least much as the IP header would have us expect. |
* Trim mbufs if longer than we expect. |
* Trim mbufs if longer than we expect. |
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* Check our list of addresses, to see if the packet is for us. |
* Check our list of addresses, to see if the packet is for us. |
*/ |
*/ |
INADDR_TO_IA(ip->ip_dst, ia); |
INADDR_TO_IA(ip->ip_dst, ia); |
if (ia != NULL) goto ours; |
if (ia != NULL) { |
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if (ia->ia_ifp->if_flags & IFF_UP) |
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goto ours; |
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} |
if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) { |
if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) { |
for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first; |
for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first; |
ifa != NULL; ifa = ifa->ifa_list.tqe_next) { |
ifa != NULL; ifa = ifa->ifa_list.tqe_next) { |
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* as expected when ip_mforward() is called from |
* as expected when ip_mforward() is called from |
* ip_output().) |
* ip_output().) |
*/ |
*/ |
ip->ip_id = htons(ip->ip_id); |
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if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) { |
if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) { |
ipstat.ips_cantforward++; |
ipstat.ips_cantforward++; |
m_freem(m); |
m_freem(m); |
goto next; |
goto next; |
} |
} |
ip->ip_id = ntohs(ip->ip_id); |
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/* |
/* |
* The process-level routing demon needs to receive |
* The process-level routing demon needs to receive |
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ipstat.ips_reassembled++; |
ipstat.ips_reassembled++; |
ip = mtod(m, struct ip *); |
ip = mtod(m, struct ip *); |
hlen = ip->ip_hl << 2; |
hlen = ip->ip_hl << 2; |
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ip->ip_len += hlen; |
} else |
} else |
if (fp) |
if (fp) |
ip_freef(fp); |
ip_freef(fp); |
IPQ_UNLOCK(); |
IPQ_UNLOCK(); |
} else |
} |
ip->ip_len -= hlen; |
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/* |
/* |
* Switch out to protocol's input routine. |
* Switch out to protocol's input routine. |
*/ |
*/ |
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#if IFA_STATS |
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ia->ia_ifa.ifa_data.ifad_inbytes += ip->ip_len; |
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#endif |
ipstat.ips_delivered++; |
ipstat.ips_delivered++; |
(*inetsw[ip_protox[ip->ip_p]].pr_input)(m, hlen); |
(*inetsw[ip_protox[ip->ip_p]].pr_input)(m, hlen); |
goto next; |
goto next; |
Line 1021 ip_dooptions(m) |
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Line 1033 ip_dooptions(m) |
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} |
} |
return (0); |
return (0); |
bad: |
bad: |
ip->ip_len -= ip->ip_hl << 2; /* XXX icmp_error adds in hdr length */ |
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icmp_error(m, type, code, 0, 0); |
icmp_error(m, type, code, 0, 0); |
ipstat.ips_badoptions++; |
ipstat.ips_badoptions++; |
return (1); |
return (1); |
Line 1164 ip_stripoptions(m, mopt) |
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Line 1175 ip_stripoptions(m, mopt) |
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register caddr_t opts; |
register caddr_t opts; |
int olen; |
int olen; |
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olen = (ip->ip_hl<<2) - sizeof (struct ip); |
olen = (ip->ip_hl << 2) - sizeof (struct ip); |
opts = (caddr_t)(ip + 1); |
opts = (caddr_t)(ip + 1); |
i = m->m_len - (sizeof (struct ip) + olen); |
i = m->m_len - (sizeof (struct ip) + olen); |
bcopy(opts + olen, opts, (unsigned)i); |
bcopy(opts + olen, opts, (unsigned)i); |
m->m_len -= olen; |
m->m_len -= olen; |
if (m->m_flags & M_PKTHDR) |
if (m->m_flags & M_PKTHDR) |
m->m_pkthdr.len -= olen; |
m->m_pkthdr.len -= olen; |
ip->ip_hl = sizeof(struct ip) >> 2; |
ip->ip_len -= olen; |
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ip->ip_hl = sizeof (struct ip) >> 2; |
} |
} |
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int inetctlerrmap[PRC_NCMDS] = { |
int inetctlerrmap[PRC_NCMDS] = { |
Line 1222 ip_forward(m, srcrt) |
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Line 1234 ip_forward(m, srcrt) |
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m_freem(m); |
m_freem(m); |
return; |
return; |
} |
} |
HTONS(ip->ip_id); |
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if (ip->ip_ttl <= IPTTLDEC) { |
if (ip->ip_ttl <= IPTTLDEC) { |
icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0); |
icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0); |
return; |
return; |
Line 1269 ip_forward(m, srcrt) |
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Line 1280 ip_forward(m, srcrt) |
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if (rt->rt_ifa && |
if (rt->rt_ifa && |
(ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) == |
(ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) == |
ifatoia(rt->rt_ifa)->ia_subnet) { |
ifatoia(rt->rt_ifa)->ia_subnet) { |
if (rt->rt_flags & RTF_GATEWAY) |
if (rt->rt_flags & RTF_GATEWAY) |
dest = satosin(rt->rt_gateway)->sin_addr.s_addr; |
dest = satosin(rt->rt_gateway)->sin_addr.s_addr; |
else |
else |
dest = ip->ip_dst.s_addr; |
dest = ip->ip_dst.s_addr; |
/* Router requirements says to only send host redirects */ |
/* |
type = ICMP_REDIRECT; |
* Router requirements says to only send host |
code = ICMP_REDIRECT_HOST; |
* redirects. |
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*/ |
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type = ICMP_REDIRECT; |
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code = ICMP_REDIRECT_HOST; |
#ifdef DIAGNOSTIC |
#ifdef DIAGNOSTIC |
if (ipprintfs) |
if (ipprintfs) |
printf("redirect (%d) to %x\n", code, (u_int32_t)dest); |
printf("redirect (%d) to %x\n", code, |
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(u_int32_t)dest); |
#endif |
#endif |
} |
} |
} |
} |