version 1.50.4.1, 1997/09/01 21:00:39 |
version 1.70, 1998/09/09 04:57:18 |
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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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#include "opt_gateway.h" |
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#include "opt_pfil_hooks.h" |
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#include "opt_mrouting.h" |
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#include <sys/param.h> |
#include <sys/param.h> |
#include <sys/systm.h> |
#include <sys/systm.h> |
#include <sys/malloc.h> |
#include <sys/malloc.h> |
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#include <netinet/ip_var.h> |
#include <netinet/ip_var.h> |
#include <netinet/ip_icmp.h> |
#include <netinet/ip_icmp.h> |
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/* XXX should really put this in libkern.h */ |
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#define offsetof(type, member) ((size_t)(&((type *)0)->member)) |
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#ifndef IPFORWARDING |
#ifndef IPFORWARDING |
#ifdef GATEWAY |
#ifdef GATEWAY |
#define IPFORWARDING 1 /* forward IP packets not for us */ |
#define IPFORWARDING 1 /* forward IP packets not for us */ |
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#ifndef IPALLOWSRCRT |
#ifndef IPALLOWSRCRT |
#define IPALLOWSRCRT 1 /* allow source-routed packets */ |
#define IPALLOWSRCRT 1 /* allow source-routed packets */ |
#endif |
#endif |
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#ifndef IPMTUDISC |
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#define IPMTUDISC 0 |
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#endif |
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#ifndef IPMTUDISCTIMEOUT |
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#define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */ |
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#endif |
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/* |
/* |
* Note: DIRECTED_BROADCAST is handled this way so that previous |
* Note: DIRECTED_BROADCAST is handled this way so that previous |
* configuration using this option will Just Work. |
* configuration using this option will Just Work. |
Line 100 int ip_defttl = IPDEFTTL; |
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Line 145 int ip_defttl = IPDEFTTL; |
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int ip_forwsrcrt = IPFORWSRCRT; |
int ip_forwsrcrt = IPFORWSRCRT; |
int ip_directedbcast = IPDIRECTEDBCAST; |
int ip_directedbcast = IPDIRECTEDBCAST; |
int ip_allowsrcrt = IPALLOWSRCRT; |
int ip_allowsrcrt = IPALLOWSRCRT; |
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int ip_mtudisc = IPMTUDISC; |
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u_int ip_mtudisc_timeout = IPMTUDISCTIMEOUT; |
#ifdef DIAGNOSTIC |
#ifdef DIAGNOSTIC |
int ipprintfs = 0; |
int ipprintfs = 0; |
#endif |
#endif |
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struct rttimer_queue *ip_mtudisc_timeout_q = NULL; |
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extern struct domain inetdomain; |
extern struct domain inetdomain; |
extern struct protosw inetsw[]; |
extern struct protosw inetsw[]; |
u_char ip_protox[IPPROTO_MAX]; |
u_char ip_protox[IPPROTO_MAX]; |
int ipqmaxlen = IFQ_MAXLEN; |
int ipqmaxlen = IFQ_MAXLEN; |
struct in_ifaddrhead in_ifaddr; |
struct in_ifaddrhead in_ifaddr; |
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struct in_ifaddrhashhead *in_ifaddrhashtbl; |
struct ifqueue ipintrq; |
struct ifqueue ipintrq; |
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struct ipstat ipstat; |
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u_int16_t ip_id; |
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int ip_defttl; |
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struct ipqhead ipq; |
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/* |
/* |
* We need to save the IP options in case a protocol wants to respond |
* We need to save the IP options in case a protocol wants to respond |
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ip_id = time.tv_sec & 0xffff; |
ip_id = time.tv_sec & 0xffff; |
ipintrq.ifq_maxlen = ipqmaxlen; |
ipintrq.ifq_maxlen = ipqmaxlen; |
TAILQ_INIT(&in_ifaddr); |
TAILQ_INIT(&in_ifaddr); |
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in_ifaddrhashtbl = |
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hashinit(IN_IFADDR_HASH_SIZE, M_IFADDR, M_WAITOK, &in_ifaddrhash); |
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if (ip_mtudisc != 0) |
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ip_mtudisc_timeout_q = |
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rt_timer_queue_create(ip_mtudisc_timeout); |
} |
} |
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struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET }; |
struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET }; |
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register struct mbuf *m; |
register struct mbuf *m; |
register struct ipq *fp; |
register struct ipq *fp; |
register struct in_ifaddr *ia; |
register struct in_ifaddr *ia; |
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register struct ifaddr *ifa; |
struct ipqent *ipqe; |
struct ipqent *ipqe; |
int hlen = 0, mff, len, s; |
int hlen = 0, mff, len, s; |
#ifdef PFIL_HOOKS |
#ifdef PFIL_HOOKS |
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m_adj(m, len - m->m_pkthdr.len); |
m_adj(m, len - m->m_pkthdr.len); |
} |
} |
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/* |
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* Assume that we can create a fast-forward IP flow entry |
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* based on this packet. |
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*/ |
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m->m_flags |= M_CANFASTFWD; |
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#ifdef PFIL_HOOKS |
#ifdef PFIL_HOOKS |
/* |
/* |
* Run through list of hooks for input packets. |
* Run through list of hooks for input packets. If there are any |
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* filters which require that additional packets in the flow are |
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* not fast-forwarded, they must clear the M_CANFASTFWD flag. |
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* Note that filters must _never_ set this flag, as another filter |
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* in the list may have previously cleared it. |
*/ |
*/ |
m0 = m; |
m0 = m; |
for (pfh = pfil_hook_get(PFIL_IN); pfh; pfh = pfh->pfil_link.le_next) |
for (pfh = pfil_hook_get(PFIL_IN); pfh; pfh = pfh->pfil_link.tqe_next) |
if (pfh->pfil_func) { |
if (pfh->pfil_func) { |
rv = pfh->pfil_func(ip, hlen, m->m_pkthdr.rcvif, 0, &m0); |
rv = pfh->pfil_func(ip, hlen, m->m_pkthdr.rcvif, 0, &m0); |
if (rv) |
if (rv) |
goto next; |
goto next; |
ip = mtod(m = m0, struct ip *); |
m = m0; |
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if (m == NULL) |
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goto next; |
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ip = mtod(m, struct ip *); |
} |
} |
#endif /* PFIL_HOOKS */ |
#endif /* PFIL_HOOKS */ |
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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. |
*/ |
*/ |
for (ia = in_ifaddr.tqh_first; ia; ia = ia->ia_list.tqe_next) { |
INADDR_TO_IA(ip->ip_dst, ia); |
if (in_hosteq(ip->ip_dst, ia->ia_addr.sin_addr)) |
if (ia != NULL) goto ours; |
goto ours; |
if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) { |
if (((ip_directedbcast == 0) || (ip_directedbcast && |
for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first; |
ia->ia_ifp == m->m_pkthdr.rcvif)) && |
ifa != NULL; ifa = ifa->ifa_list.tqe_next) { |
(ia->ia_ifp->if_flags & IFF_BROADCAST)) { |
if (ifa->ifa_addr->sa_family != AF_INET) continue; |
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ia = ifatoia(ifa); |
if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) || |
if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) || |
in_hosteq(ip->ip_dst, ia->ia_netbroadcast) || |
in_hosteq(ip->ip_dst, ia->ia_netbroadcast) || |
/* |
/* |
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ip->ip_dst.s_addr == ia->ia_subnet || |
ip->ip_dst.s_addr == ia->ia_subnet || |
ip->ip_dst.s_addr == ia->ia_net) |
ip->ip_dst.s_addr == ia->ia_net) |
goto ours; |
goto ours; |
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/* |
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* An interface with IP address zero accepts |
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* all packets that arrive on that interface. |
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*/ |
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if (in_nullhost(ia->ia_addr.sin_addr)) |
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goto ours; |
} |
} |
/* |
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* An interface with IP address zero accepts |
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* all packets that arrive on that interface. |
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*/ |
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if ((ia->ia_ifp == m->m_pkthdr.rcvif) && |
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in_nullhost(ia->ia_addr.sin_addr)) |
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goto ours; |
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} |
} |
if (IN_MULTICAST(ip->ip_dst.s_addr)) { |
if (IN_MULTICAST(ip->ip_dst.s_addr)) { |
struct in_multi *inm; |
struct in_multi *inm; |
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ip_freef(fp); |
ip_freef(fp); |
} |
} |
} |
} |
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#ifdef GATEWAY |
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ipflow_slowtimo(); |
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#endif |
splx(s); |
splx(s); |
} |
} |
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break; |
break; |
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case IPOPT_TS_TSANDADDR: |
case IPOPT_TS_TSANDADDR: |
if (ipt->ipt_ptr + sizeof(n_time) + |
if (ipt->ipt_ptr - 1 + sizeof(n_time) + |
sizeof(struct in_addr) > ipt->ipt_len) |
sizeof(struct in_addr) > ipt->ipt_len) |
goto bad; |
goto bad; |
ipaddr.sin_addr = dst; |
ipaddr.sin_addr = dst; |
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break; |
break; |
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case IPOPT_TS_PRESPEC: |
case IPOPT_TS_PRESPEC: |
if (ipt->ipt_ptr + sizeof(n_time) + |
if (ipt->ipt_ptr - 1 + sizeof(n_time) + |
sizeof(struct in_addr) > ipt->ipt_len) |
sizeof(struct in_addr) > ipt->ipt_len) |
goto bad; |
goto bad; |
bcopy((caddr_t)sin, (caddr_t)&ipaddr.sin_addr, |
bcopy((caddr_t)sin, (caddr_t)&ipaddr.sin_addr, |
Line 1055 ip_forward(m, srcrt) |
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Line 1131 ip_forward(m, srcrt) |
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dest = 0; |
dest = 0; |
#ifdef DIAGNOSTIC |
#ifdef DIAGNOSTIC |
if (ipprintfs) |
if (ipprintfs) |
printf("forward: src %x dst %x ttl %x\n", |
printf("forward: src %2.2x dst %2.2x ttl %x\n", |
ip->ip_src.s_addr, ip->ip_dst.s_addr, ip->ip_ttl); |
ntohl(ip->ip_src.s_addr), |
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ntohl(ip->ip_dst.s_addr), ip->ip_ttl); |
#endif |
#endif |
if (m->m_flags & M_BCAST || in_canforward(ip->ip_dst) == 0) { |
if (m->m_flags & M_BCAST || in_canforward(ip->ip_dst) == 0) { |
ipstat.ips_cantforward++; |
ipstat.ips_cantforward++; |
Line 1133 ip_forward(m, srcrt) |
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Line 1210 ip_forward(m, srcrt) |
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if (type) |
if (type) |
ipstat.ips_redirectsent++; |
ipstat.ips_redirectsent++; |
else { |
else { |
if (mcopy) |
if (mcopy) { |
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#ifdef GATEWAY |
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if (mcopy->m_flags & M_CANFASTFWD) |
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ipflow_create(&ipforward_rt, mcopy); |
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#endif |
m_freem(mcopy); |
m_freem(mcopy); |
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} |
return; |
return; |
} |
} |
} |
} |
Line 1242 ip_sysctl(name, namelen, oldp, oldlenp, |
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Line 1324 ip_sysctl(name, namelen, oldp, oldlenp, |
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void *newp; |
void *newp; |
size_t newlen; |
size_t newlen; |
{ |
{ |
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extern int subnetsarelocal; |
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int error, old; |
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/* All sysctl names at this level are terminal. */ |
/* All sysctl names at this level are terminal. */ |
if (namelen != 1) |
if (namelen != 1) |
return (ENOTDIR); |
return (ENOTDIR); |
Line 1272 ip_sysctl(name, namelen, oldp, oldlenp, |
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Line 1358 ip_sysctl(name, namelen, oldp, oldlenp, |
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case IPCTL_ALLOWSRCRT: |
case IPCTL_ALLOWSRCRT: |
return (sysctl_int(oldp, oldlenp, newp, newlen, |
return (sysctl_int(oldp, oldlenp, newp, newlen, |
&ip_allowsrcrt)); |
&ip_allowsrcrt)); |
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case IPCTL_SUBNETSARELOCAL: |
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return (sysctl_int(oldp, oldlenp, newp, newlen, |
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&subnetsarelocal)); |
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case IPCTL_MTUDISC: |
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error = sysctl_int(oldp, oldlenp, newp, newlen, |
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&ip_mtudisc); |
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if (ip_mtudisc != 0 && ip_mtudisc_timeout_q == NULL) { |
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ip_mtudisc_timeout_q = |
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rt_timer_queue_create(ip_mtudisc_timeout); |
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} else if (ip_mtudisc == 0 && ip_mtudisc_timeout_q != NULL) { |
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rt_timer_queue_destroy(ip_mtudisc_timeout_q, TRUE); |
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ip_mtudisc_timeout_q = NULL; |
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} |
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return error; |
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case IPCTL_ANONPORTMIN: |
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old = anonportmin; |
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error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin); |
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if (anonportmin >= anonportmax || anonportmin > 65535 |
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#ifndef IPNOPRIVPORTS |
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|| anonportmin < IPPORT_RESERVED |
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#endif |
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) { |
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anonportmin = old; |
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return (EINVAL); |
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} |
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return (error); |
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case IPCTL_ANONPORTMAX: |
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old = anonportmax; |
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error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax); |
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if (anonportmin >= anonportmax || anonportmax > 65535 |
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#ifndef IPNOPRIVPORTS |
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|| anonportmax < IPPORT_RESERVED |
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#endif |
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) { |
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anonportmax = old; |
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return (EINVAL); |
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} |
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return (error); |
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case IPCTL_MTUDISCTIMEOUT: |
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error = sysctl_int(oldp, oldlenp, newp, newlen, |
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&ip_mtudisc_timeout); |
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if (ip_mtudisc_timeout_q != NULL) |
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rt_timer_queue_change(ip_mtudisc_timeout_q, |
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ip_mtudisc_timeout); |
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return (error); |
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#ifdef GATEWAY |
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case IPCTL_MAXFLOWS: |
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{ |
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int s; |
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error = sysctl_int(oldp, oldlenp, newp, newlen, |
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&ip_maxflows); |
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s = splsoftnet(); |
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ipflow_reap(0); |
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splx(s); |
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return (error); |
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} |
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#endif |
default: |
default: |
return (EOPNOTSUPP); |
return (EOPNOTSUPP); |
} |
} |