version 1.3.4.1, 1993/09/24 08:54:56 |
version 1.23, 1995/06/12 06:46:36 |
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/* $NetBSD$ */ |
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/* |
/* |
* Copyright (c) 1982, 1986, 1988 Regents of the University of California. |
* Copyright (c) 1982, 1986, 1988, 1993 |
* All rights reserved. |
* The Regents of the University of California. All rights reserved. |
* |
* |
* Redistribution and use in source and binary forms, with or without |
* Redistribution and use in source and binary forms, with or without |
* modification, are permitted provided that the following conditions |
* modification, are permitted provided that the following conditions |
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
* SUCH DAMAGE. |
* SUCH DAMAGE. |
* |
* |
* from: @(#)ip_input.c 7.19 (Berkeley) 5/25/91 |
* @(#)ip_input.c 8.2 (Berkeley) 1/4/94 |
* $Id$ |
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*/ |
*/ |
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#include "param.h" |
#include <sys/param.h> |
#include "systm.h" |
#include <sys/systm.h> |
#include "malloc.h" |
#include <sys/malloc.h> |
#include "mbuf.h" |
#include <sys/mbuf.h> |
#include "domain.h" |
#include <sys/domain.h> |
#include "protosw.h" |
#include <sys/protosw.h> |
#include "socket.h" |
#include <sys/socket.h> |
#include "errno.h" |
#include <sys/errno.h> |
#include "time.h" |
#include <sys/time.h> |
#include "kernel.h" |
#include <sys/kernel.h> |
|
|
#include "machine/cpu.h" |
#include <net/if.h> |
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#include <net/route.h> |
#include "../net/if.h" |
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#include "../net/route.h" |
#include <netinet/in.h> |
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#include <netinet/in_systm.h> |
#include "in.h" |
#include <netinet/ip.h> |
#include "in_systm.h" |
#include <netinet/in_pcb.h> |
#include "ip.h" |
#include <netinet/in_var.h> |
#include "in_pcb.h" |
#include <netinet/ip_var.h> |
#include "in_var.h" |
#include <netinet/ip_icmp.h> |
#include "ip_var.h" |
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#include "ip_icmp.h" |
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#ifndef IPFORWARDING |
#ifndef IPFORWARDING |
#ifdef GATEWAY |
#ifdef GATEWAY |
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#endif |
#endif |
int ipforwarding = IPFORWARDING; |
int ipforwarding = IPFORWARDING; |
int ipsendredirects = IPSENDREDIRECTS; |
int ipsendredirects = IPSENDREDIRECTS; |
|
int ip_defttl = IPDEFTTL; |
#ifdef DIAGNOSTIC |
#ifdef DIAGNOSTIC |
int ipprintfs = 0; |
int ipprintfs = 0; |
#endif |
#endif |
Line 78 extern struct domain inetdomain; |
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Line 78 extern struct domain inetdomain; |
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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_ifaddr *in_ifaddr; /* first inet address */ |
struct in_ifaddrhead in_ifaddr; |
|
struct ifqueue ipintrq; |
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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 |
Line 95 static struct ip_srcrt { |
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Line 96 static struct ip_srcrt { |
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struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)]; |
struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)]; |
} ip_srcrt; |
} ip_srcrt; |
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#ifdef GATEWAY |
static void save_rte __P((u_char *, struct in_addr)); |
extern int if_index; |
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u_long *ip_ifmatrix; |
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#endif |
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/* |
/* |
* IP initialization: fill in IP protocol switch table. |
* IP initialization: fill in IP protocol switch table. |
* All protocols not implemented in kernel go to raw IP protocol handler. |
* All protocols not implemented in kernel go to raw IP protocol handler. |
*/ |
*/ |
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void |
ip_init() |
ip_init() |
{ |
{ |
register struct protosw *pr; |
register struct protosw *pr; |
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ipq.next = ipq.prev = &ipq; |
ipq.next = ipq.prev = &ipq; |
ip_id = time.tv_sec & 0xffff; |
ip_id = time.tv_sec & 0xffff; |
ipintrq.ifq_maxlen = ipqmaxlen; |
ipintrq.ifq_maxlen = ipqmaxlen; |
#ifdef GATEWAY |
TAILQ_INIT(&in_ifaddr); |
i = (if_index + 1) * (if_index + 1) * sizeof (u_long); |
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if ((ip_ifmatrix = (u_long *) malloc(i, M_RTABLE, M_WAITOK)) == 0) |
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panic("no memory for ip_ifmatrix"); |
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#endif |
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} |
} |
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struct ip *ip_reass(); |
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struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET }; |
struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET }; |
struct route ipforward_rt; |
struct route ipforward_rt; |
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Line 137 struct route ipforward_rt; |
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Line 130 struct route ipforward_rt; |
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* Ip input routine. Checksum and byte swap header. If fragmented |
* Ip input routine. Checksum and byte swap header. If fragmented |
* try to reassemble. Process options. Pass to next level. |
* try to reassemble. Process options. Pass to next level. |
*/ |
*/ |
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void |
ipintr() |
ipintr() |
{ |
{ |
register struct ip *ip; |
register struct ip *ip; |
|
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register struct ipq *fp; |
register struct ipq *fp; |
register struct in_ifaddr *ia; |
register struct in_ifaddr *ia; |
int hlen, s; |
int hlen, s; |
#ifdef PARANOID |
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static int busy = 0; |
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if (busy) |
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panic("ipintr: called recursively\n"); |
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++busy; |
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#endif |
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next: |
next: |
/* |
/* |
* Get next datagram off input queue and get IP header |
* Get next datagram off input queue and get IP header |
|
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s = splimp(); |
s = splimp(); |
IF_DEQUEUE(&ipintrq, m); |
IF_DEQUEUE(&ipintrq, m); |
splx(s); |
splx(s); |
if (m == 0) { |
if (m == 0) |
#ifdef PARANOID |
|
--busy; |
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#endif |
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return; |
return; |
} |
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#ifdef DIAGNOSTIC |
#ifdef DIAGNOSTIC |
if ((m->m_flags & M_PKTHDR) == 0) |
if ((m->m_flags & M_PKTHDR) == 0) |
panic("ipintr no HDR"); |
panic("ipintr no HDR"); |
|
|
* If no IP addresses have been set yet but the interfaces |
* If no IP addresses have been set yet but the interfaces |
* are receiving, can't do anything with incoming packets yet. |
* are receiving, can't do anything with incoming packets yet. |
*/ |
*/ |
if (in_ifaddr == NULL) |
if (in_ifaddr.tqh_first == 0) |
goto bad; |
goto bad; |
ipstat.ips_total++; |
ipstat.ips_total++; |
if (m->m_len < sizeof (struct ip) && |
if (m->m_len < sizeof (struct ip) && |
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|
goto next; |
goto next; |
} |
} |
ip = mtod(m, struct ip *); |
ip = mtod(m, struct ip *); |
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if (ip->ip_v != IPVERSION) { |
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ipstat.ips_badvers++; |
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goto bad; |
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} |
hlen = ip->ip_hl << 2; |
hlen = ip->ip_hl << 2; |
if (hlen < sizeof(struct ip)) { /* minimum header length */ |
if (hlen < sizeof(struct ip)) { /* minimum header length */ |
ipstat.ips_badhlen++; |
ipstat.ips_badhlen++; |
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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; ia; ia = ia->ia_next) { |
for (ia = in_ifaddr.tqh_first; ia; ia = ia->ia_list.tqe_next) { |
#define satosin(sa) ((struct sockaddr_in *)(sa)) |
if (ip->ip_dst.s_addr == ia->ia_addr.sin_addr.s_addr) |
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if (IA_SIN(ia)->sin_addr.s_addr == ip->ip_dst.s_addr) |
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goto ours; |
goto ours; |
if ( |
if ( |
#ifdef DIRECTED_BROADCAST |
#ifdef DIRECTED_BROADCAST |
ia->ia_ifp == m->m_pkthdr.rcvif && |
ia->ia_ifp == m->m_pkthdr.rcvif && |
#endif |
#endif |
(ia->ia_ifp->if_flags & IFF_BROADCAST)) { |
(ia->ia_ifp->if_flags & IFF_BROADCAST)) { |
u_long t; |
if (ip->ip_dst.s_addr == ia->ia_broadaddr.sin_addr.s_addr || |
|
ip->ip_dst.s_addr == ia->ia_netbroadcast.s_addr || |
if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr == |
/* |
ip->ip_dst.s_addr) |
* Look for all-0's host part (old broadcast addr), |
goto ours; |
* either for subnet or net. |
if (ip->ip_dst.s_addr == ia->ia_netbroadcast.s_addr) |
*/ |
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ip->ip_dst.s_addr == ia->ia_subnet || |
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ip->ip_dst.s_addr == ia->ia_net) |
goto ours; |
goto ours; |
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} |
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} |
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if (IN_MULTICAST(ip->ip_dst.s_addr)) { |
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struct in_multi *inm; |
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#ifdef MROUTING |
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extern struct socket *ip_mrouter; |
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if (m->m_flags & M_EXT) { |
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if ((m = m_pullup(m, hlen)) == 0) { |
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ipstat.ips_toosmall++; |
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goto next; |
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} |
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ip = mtod(m, struct ip *); |
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} |
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if (ip_mrouter) { |
/* |
/* |
* Look for all-0's host part (old broadcast addr), |
* If we are acting as a multicast router, all |
* either for subnet or net. |
* incoming multicast packets are passed to the |
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* kernel-level multicast forwarding function. |
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* The packet is returned (relatively) intact; if |
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* ip_mforward() returns a non-zero value, the packet |
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* must be discarded, else it may be accepted below. |
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* |
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* (The IP ident field is put in the same byte order |
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* as expected when ip_mforward() is called from |
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* ip_output().) |
*/ |
*/ |
t = ntohl(ip->ip_dst.s_addr); |
ip->ip_id = htons(ip->ip_id); |
if (t == ia->ia_subnet) |
if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) { |
goto ours; |
ipstat.ips_cantforward++; |
if (t == ia->ia_net) |
m_freem(m); |
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goto next; |
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} |
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ip->ip_id = ntohs(ip->ip_id); |
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/* |
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* The process-level routing demon needs to receive |
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* all multicast IGMP packets, whether or not this |
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* host belongs to their destination groups. |
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*/ |
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if (ip->ip_p == IPPROTO_IGMP) |
goto ours; |
goto ours; |
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ipstat.ips_forward++; |
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} |
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#endif |
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/* |
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* See if we belong to the destination multicast group on the |
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* arrival interface. |
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*/ |
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IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm); |
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if (inm == NULL) { |
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ipstat.ips_cantforward++; |
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m_freem(m); |
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goto next; |
} |
} |
} |
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if (ip->ip_dst.s_addr == (u_long)INADDR_BROADCAST) |
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goto ours; |
goto ours; |
if (ip->ip_dst.s_addr == INADDR_ANY) |
} |
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if (ip->ip_dst.s_addr == INADDR_BROADCAST || |
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ip->ip_dst.s_addr == INADDR_ANY) |
goto ours; |
goto ours; |
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/* |
/* |
|
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* convert offset of this to bytes. |
* convert offset of this to bytes. |
*/ |
*/ |
ip->ip_len -= hlen; |
ip->ip_len -= hlen; |
((struct ipasfrag *)ip)->ipf_mff = 0; |
((struct ipasfrag *)ip)->ipf_mff &= ~1; |
if (ip->ip_off & IP_MF) |
if (ip->ip_off & IP_MF) { |
((struct ipasfrag *)ip)->ipf_mff = 1; |
/* |
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* Make sure that fragments have a data length |
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* that's a non-zero multiple of 8 bytes. |
|
*/ |
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if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) { |
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ipstat.ips_badfrags++; |
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goto bad; |
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} |
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((struct ipasfrag *)ip)->ipf_mff |= 1; |
|
} |
ip->ip_off <<= 3; |
ip->ip_off <<= 3; |
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/* |
/* |
|
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* or if this is not the first fragment, |
* or if this is not the first fragment, |
* attempt reassembly; if it succeeds, proceed. |
* attempt reassembly; if it succeeds, proceed. |
*/ |
*/ |
if (((struct ipasfrag *)ip)->ipf_mff || ip->ip_off) { |
if (((struct ipasfrag *)ip)->ipf_mff & 1 || ip->ip_off) { |
ipstat.ips_fragments++; |
ipstat.ips_fragments++; |
ip = ip_reass((struct ipasfrag *)ip, fp); |
ip = ip_reass((struct ipasfrag *)ip, fp); |
if (ip == 0) |
if (ip == 0) |
goto next; |
goto next; |
else |
ipstat.ips_reassembled++; |
ipstat.ips_reassembled++; |
|
m = dtom(ip); |
m = dtom(ip); |
} else |
} else |
if (fp) |
if (fp) |
|
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return (0); |
return (0); |
next += q->ip_len; |
next += q->ip_len; |
} |
} |
if (q->ipf_prev->ipf_mff) |
if (q->ipf_prev->ipf_mff & 1) |
return (0); |
return (0); |
|
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/* |
/* |
|
|
*/ |
*/ |
ip = fp->ipq_next; |
ip = fp->ipq_next; |
ip->ip_len = next; |
ip->ip_len = next; |
|
ip->ipf_mff &= ~1; |
((struct ip *)ip)->ip_src = fp->ipq_src; |
((struct ip *)ip)->ip_src = fp->ipq_src; |
((struct ip *)ip)->ip_dst = fp->ipq_dst; |
((struct ip *)ip)->ip_dst = fp->ipq_dst; |
remque(fp); |
remque(fp); |
|
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* Free a fragment reassembly header and all |
* Free a fragment reassembly header and all |
* associated datagrams. |
* associated datagrams. |
*/ |
*/ |
|
void |
ip_freef(fp) |
ip_freef(fp) |
struct ipq *fp; |
struct ipq *fp; |
{ |
{ |
|
|
* Put an ip fragment on a reassembly chain. |
* Put an ip fragment on a reassembly chain. |
* Like insque, but pointers in middle of structure. |
* Like insque, but pointers in middle of structure. |
*/ |
*/ |
|
void |
ip_enq(p, prev) |
ip_enq(p, prev) |
register struct ipasfrag *p, *prev; |
register struct ipasfrag *p, *prev; |
{ |
{ |
|
|
/* |
/* |
* To ip_enq as remque is to insque. |
* To ip_enq as remque is to insque. |
*/ |
*/ |
|
void |
ip_deq(p) |
ip_deq(p) |
register struct ipasfrag *p; |
register struct ipasfrag *p; |
{ |
{ |
|
|
* if a timer expires on a reassembly |
* if a timer expires on a reassembly |
* queue, discard it. |
* queue, discard it. |
*/ |
*/ |
|
void |
ip_slowtimo() |
ip_slowtimo() |
{ |
{ |
register struct ipq *fp; |
register struct ipq *fp; |
|
|
/* |
/* |
* Drain off all datagram fragments. |
* Drain off all datagram fragments. |
*/ |
*/ |
|
void |
ip_drain() |
ip_drain() |
{ |
{ |
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|
|
|
} |
} |
} |
} |
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extern struct in_ifaddr *ifptoia(); |
|
struct in_ifaddr *ip_rtaddr(); |
|
|
|
/* |
/* |
* Do option processing on a datagram, |
* Do option processing on a datagram, |
* possibly discarding it if bad options are encountered, |
* possibly discarding it if bad options are encountered, |
Line 587 struct in_ifaddr *ip_rtaddr(); |
|
Line 632 struct in_ifaddr *ip_rtaddr(); |
|
* Returns 1 if packet has been forwarded/freed, |
* Returns 1 if packet has been forwarded/freed, |
* 0 if the packet should be processed further. |
* 0 if the packet should be processed further. |
*/ |
*/ |
|
int |
ip_dooptions(m) |
ip_dooptions(m) |
struct mbuf *m; |
struct mbuf *m; |
{ |
{ |
|
|
register struct ip_timestamp *ipt; |
register struct ip_timestamp *ipt; |
register struct in_ifaddr *ia; |
register struct in_ifaddr *ia; |
int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0; |
int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0; |
struct in_addr *sin; |
struct in_addr *sin, dst; |
n_time ntime; |
n_time ntime; |
|
|
|
dst = ip->ip_dst; |
cp = (u_char *)(ip + 1); |
cp = (u_char *)(ip + 1); |
cnt = (ip->ip_hl << 2) - sizeof (struct ip); |
cnt = (ip->ip_hl << 2) - sizeof (struct ip); |
for (; cnt > 0; cnt -= optlen, cp += optlen) { |
for (; cnt > 0; cnt -= optlen, cp += optlen) { |
|
|
goto bad; |
goto bad; |
} |
} |
ipaddr.sin_addr = ip->ip_dst; |
ipaddr.sin_addr = ip->ip_dst; |
ia = (struct in_ifaddr *) |
ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))); |
ifa_ifwithaddr((struct sockaddr *)&ipaddr); |
|
if (ia == 0) { |
if (ia == 0) { |
if (opt == IPOPT_SSRR) { |
if (opt == IPOPT_SSRR) { |
type = ICMP_UNREACH; |
type = ICMP_UNREACH; |
|
|
#define INA struct in_ifaddr * |
#define INA struct in_ifaddr * |
#define SA struct sockaddr * |
#define SA struct sockaddr * |
if ((ia = (INA)ifa_ifwithdstaddr((SA)&ipaddr)) == 0) |
if ((ia = (INA)ifa_ifwithdstaddr((SA)&ipaddr)) == 0) |
ia = in_iaonnetof(in_netof(ipaddr.sin_addr)); |
ia = (INA)ifa_ifwithnet((SA)&ipaddr); |
} else |
} else |
ia = ip_rtaddr(ipaddr.sin_addr); |
ia = ip_rtaddr(ipaddr.sin_addr); |
if (ia == 0) { |
if (ia == 0) { |
|
|
goto bad; |
goto bad; |
} |
} |
ip->ip_dst = ipaddr.sin_addr; |
ip->ip_dst = ipaddr.sin_addr; |
bcopy((caddr_t)&(IA_SIN(ia)->sin_addr), |
bcopy((caddr_t)&ia->ia_addr.sin_addr, |
(caddr_t)(cp + off), sizeof(struct in_addr)); |
(caddr_t)(cp + off), sizeof(struct in_addr)); |
cp[IPOPT_OFFSET] += sizeof(struct in_addr); |
cp[IPOPT_OFFSET] += sizeof(struct in_addr); |
forward = 1; |
/* |
|
* Let ip_intr's mcast routing check handle mcast pkts |
|
*/ |
|
forward = !IN_MULTICAST(ip->ip_dst.s_addr); |
break; |
break; |
|
|
case IPOPT_RR: |
case IPOPT_RR: |
|
|
code = ICMP_UNREACH_HOST; |
code = ICMP_UNREACH_HOST; |
goto bad; |
goto bad; |
} |
} |
bcopy((caddr_t)&(IA_SIN(ia)->sin_addr), |
bcopy((caddr_t)&ia->ia_addr.sin_addr, |
(caddr_t)(cp + off), sizeof(struct in_addr)); |
(caddr_t)(cp + off), sizeof(struct in_addr)); |
cp[IPOPT_OFFSET] += sizeof(struct in_addr); |
cp[IPOPT_OFFSET] += sizeof(struct in_addr); |
break; |
break; |
|
|
ipt = (struct ip_timestamp *)cp; |
ipt = (struct ip_timestamp *)cp; |
if (ipt->ipt_len < 5) |
if (ipt->ipt_len < 5) |
goto bad; |
goto bad; |
if (ipt->ipt_ptr > ipt->ipt_len - sizeof (long)) { |
if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) { |
if (++ipt->ipt_oflw == 0) |
if (++ipt->ipt_oflw == 0) |
goto bad; |
goto bad; |
break; |
break; |
|
|
if (ipt->ipt_ptr + sizeof(n_time) + |
if (ipt->ipt_ptr + sizeof(n_time) + |
sizeof(struct in_addr) > ipt->ipt_len) |
sizeof(struct in_addr) > ipt->ipt_len) |
goto bad; |
goto bad; |
ia = ifptoia(m->m_pkthdr.rcvif); |
ipaddr.sin_addr = dst; |
bcopy((caddr_t)&IA_SIN(ia)->sin_addr, |
ia = (INA)ifaof_ifpforaddr((SA)&ipaddr, |
|
m->m_pkthdr.rcvif); |
|
if (ia == 0) |
|
continue; |
|
bcopy((caddr_t)&ia->ia_addr.sin_addr, |
(caddr_t)sin, sizeof(struct in_addr)); |
(caddr_t)sin, sizeof(struct in_addr)); |
ipt->ipt_ptr += sizeof(struct in_addr); |
ipt->ipt_ptr += sizeof(struct in_addr); |
break; |
break; |
|
|
if (forward) { |
if (forward) { |
ip_forward(m, 1); |
ip_forward(m, 1); |
return (1); |
return (1); |
} else |
} |
return (0); |
return (0); |
bad: |
bad: |
icmp_error(m, type, code); |
ip->ip_len -= ip->ip_hl << 2; /* XXX icmp_error adds in hdr length */ |
|
icmp_error(m, type, code, 0, 0); |
|
ipstat.ips_badoptions++; |
return (1); |
return (1); |
} |
} |
|
|
|
|
{ |
{ |
register struct sockaddr_in *sin; |
register struct sockaddr_in *sin; |
|
|
sin = (struct sockaddr_in *) &ipforward_rt.ro_dst; |
sin = satosin(&ipforward_rt.ro_dst); |
|
|
if (ipforward_rt.ro_rt == 0 || dst.s_addr != sin->sin_addr.s_addr) { |
if (ipforward_rt.ro_rt == 0 || dst.s_addr != sin->sin_addr.s_addr) { |
if (ipforward_rt.ro_rt) { |
if (ipforward_rt.ro_rt) { |
|
|
} |
} |
if (ipforward_rt.ro_rt == 0) |
if (ipforward_rt.ro_rt == 0) |
return ((struct in_ifaddr *)0); |
return ((struct in_ifaddr *)0); |
return ((struct in_ifaddr *) ipforward_rt.ro_rt->rt_ifa); |
return (ifatoia(ipforward_rt.ro_rt->rt_ifa)); |
} |
} |
|
|
/* |
/* |
* Save incoming source route for use in replies, |
* Save incoming source route for use in replies, |
* to be picked up later by ip_srcroute if the receiver is interested. |
* to be picked up later by ip_srcroute if the receiver is interested. |
*/ |
*/ |
|
void |
save_rte(option, dst) |
save_rte(option, dst) |
u_char *option; |
u_char *option; |
struct in_addr dst; |
struct in_addr dst; |
|
|
* will be moved, and return value is their length. |
* will be moved, and return value is their length. |
* XXX should be deleted; last arg currently ignored. |
* XXX should be deleted; last arg currently ignored. |
*/ |
*/ |
|
void |
ip_stripoptions(m, mopt) |
ip_stripoptions(m, mopt) |
register struct mbuf *m; |
register struct mbuf *m; |
struct mbuf *mopt; |
struct mbuf *mopt; |
Line 909 ip_stripoptions(m, mopt) |
|
Line 966 ip_stripoptions(m, mopt) |
|
ip->ip_hl = sizeof(struct ip) >> 2; |
ip->ip_hl = sizeof(struct ip) >> 2; |
} |
} |
|
|
u_char inetctlerrmap[PRC_NCMDS] = { |
int inetctlerrmap[PRC_NCMDS] = { |
0, 0, 0, 0, |
0, 0, 0, 0, |
0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, |
0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, |
EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, |
EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, |
Line 932 u_char inetctlerrmap[PRC_NCMDS] = { |
|
Line 989 u_char inetctlerrmap[PRC_NCMDS] = { |
|
* The srcrt parameter indicates whether the packet is being forwarded |
* The srcrt parameter indicates whether the packet is being forwarded |
* via a source route. |
* via a source route. |
*/ |
*/ |
|
void |
ip_forward(m, srcrt) |
ip_forward(m, srcrt) |
struct mbuf *m; |
struct mbuf *m; |
int srcrt; |
int srcrt; |
Line 941 ip_forward(m, srcrt) |
|
Line 999 ip_forward(m, srcrt) |
|
register struct rtentry *rt; |
register struct rtentry *rt; |
int error, type = 0, code; |
int error, type = 0, code; |
struct mbuf *mcopy; |
struct mbuf *mcopy; |
struct in_addr dest; |
n_long dest; |
|
struct ifnet *destifp; |
|
|
dest.s_addr = 0; |
dest = 0; |
#ifdef DIAGNOSTIC |
#ifdef DIAGNOSTIC |
if (ipprintfs) |
if (ipprintfs) |
printf("forward: src %x dst %x ttl %x\n", ip->ip_src, |
printf("forward: src %x dst %x ttl %x\n", ip->ip_src, |
Line 956 ip_forward(m, srcrt) |
|
Line 1015 ip_forward(m, srcrt) |
|
} |
} |
HTONS(ip->ip_id); |
HTONS(ip->ip_id); |
if (ip->ip_ttl <= IPTTLDEC) { |
if (ip->ip_ttl <= IPTTLDEC) { |
icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest); |
icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0); |
return; |
return; |
} |
} |
ip->ip_ttl -= IPTTLDEC; |
ip->ip_ttl -= IPTTLDEC; |
|
|
sin = (struct sockaddr_in *)&ipforward_rt.ro_dst; |
sin = satosin(&ipforward_rt.ro_dst); |
if ((rt = ipforward_rt.ro_rt) == 0 || |
if ((rt = ipforward_rt.ro_rt) == 0 || |
ip->ip_dst.s_addr != sin->sin_addr.s_addr) { |
ip->ip_dst.s_addr != sin->sin_addr.s_addr) { |
if (ipforward_rt.ro_rt) { |
if (ipforward_rt.ro_rt) { |
Line 974 ip_forward(m, srcrt) |
|
Line 1033 ip_forward(m, srcrt) |
|
|
|
rtalloc(&ipforward_rt); |
rtalloc(&ipforward_rt); |
if (ipforward_rt.ro_rt == 0) { |
if (ipforward_rt.ro_rt == 0) { |
icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest); |
icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0); |
return; |
return; |
} |
} |
rt = ipforward_rt.ro_rt; |
rt = ipforward_rt.ro_rt; |
Line 986 ip_forward(m, srcrt) |
|
Line 1045 ip_forward(m, srcrt) |
|
*/ |
*/ |
mcopy = m_copy(m, 0, imin((int)ip->ip_len, 64)); |
mcopy = m_copy(m, 0, imin((int)ip->ip_len, 64)); |
|
|
#ifdef GATEWAY |
|
ip_ifmatrix[rt->rt_ifp->if_index + |
|
if_index * m->m_pkthdr.rcvif->if_index]++; |
|
#endif |
|
/* |
/* |
* If forwarding packet using same interface that it came in on, |
* If forwarding packet using same interface that it came in on, |
* perhaps should send a redirect to sender to shortcut a hop. |
* perhaps should send a redirect to sender to shortcut a hop. |
Line 998 ip_forward(m, srcrt) |
|
Line 1053 ip_forward(m, srcrt) |
|
* Also, don't send redirect if forwarding using a default route |
* Also, don't send redirect if forwarding using a default route |
* or a route modified by a redirect. |
* or a route modified by a redirect. |
*/ |
*/ |
#define satosin(sa) ((struct sockaddr_in *)(sa)) |
|
if (rt->rt_ifp == m->m_pkthdr.rcvif && |
if (rt->rt_ifp == m->m_pkthdr.rcvif && |
(rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 && |
(rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 && |
satosin(rt_key(rt))->sin_addr.s_addr != 0 && |
satosin(rt_key(rt))->sin_addr.s_addr != 0 && |
ipsendredirects && !srcrt) { |
ipsendredirects && !srcrt) { |
struct in_ifaddr *ia; |
if (rt->rt_ifa && |
u_long src = ntohl(ip->ip_src.s_addr); |
(ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) == |
u_long dst = ntohl(ip->ip_dst.s_addr); |
ifatoia(rt->rt_ifa)->ia_subnet) { |
|
|
if ((ia = ifptoia(m->m_pkthdr.rcvif)) && |
|
(src & ia->ia_subnetmask) == ia->ia_subnet) { |
|
if (rt->rt_flags & RTF_GATEWAY) |
if (rt->rt_flags & RTF_GATEWAY) |
dest = satosin(rt->rt_gateway)->sin_addr; |
dest = satosin(rt->rt_gateway)->sin_addr.s_addr; |
else |
else |
dest = ip->ip_dst; |
dest = ip->ip_dst.s_addr; |
/* |
/* Router requirements says to only send host redirects */ |
* If the destination is reached by a route to host, |
|
* is on a subnet of a local net, or is directly |
|
* on the attached net (!), use host redirect. |
|
* (We may be the correct first hop for other subnets.) |
|
*/ |
|
#define RTA(rt) ((struct in_ifaddr *)(rt->rt_ifa)) |
|
type = ICMP_REDIRECT; |
type = ICMP_REDIRECT; |
if ((rt->rt_flags & RTF_HOST) || |
code = ICMP_REDIRECT_HOST; |
(rt->rt_flags & RTF_GATEWAY) == 0) |
|
code = ICMP_REDIRECT_HOST; |
|
else if (RTA(rt)->ia_subnetmask != RTA(rt)->ia_netmask && |
|
(dst & RTA(rt)->ia_netmask) == RTA(rt)->ia_net) |
|
code = ICMP_REDIRECT_HOST; |
|
else |
|
code = ICMP_REDIRECT_NET; |
|
#ifdef DIAGNOSTIC |
#ifdef DIAGNOSTIC |
if (ipprintfs) |
if (ipprintfs) |
printf("redirect (%d) to %x\n", code, dest.s_addr); |
printf("redirect (%d) to %lx\n", code, (u_int32_t)dest); |
#endif |
#endif |
} |
} |
} |
} |
|
|
error = ip_output(m, (struct mbuf *)0, &ipforward_rt, IP_FORWARDING); |
error = ip_output(m, (struct mbuf *)0, &ipforward_rt, IP_FORWARDING |
|
#ifdef DIRECTED_BROADCAST |
|
| IP_ALLOWBROADCAST |
|
#endif |
|
, 0); |
if (error) |
if (error) |
ipstat.ips_cantforward++; |
ipstat.ips_cantforward++; |
else { |
else { |
Line 1051 ip_forward(m, srcrt) |
|
Line 1093 ip_forward(m, srcrt) |
|
} |
} |
if (mcopy == NULL) |
if (mcopy == NULL) |
return; |
return; |
|
destifp = NULL; |
|
|
switch (error) { |
switch (error) { |
|
|
case 0: /* forwarded, but need redirect */ |
case 0: /* forwarded, but need redirect */ |
Line 1069 ip_forward(m, srcrt) |
|
Line 1113 ip_forward(m, srcrt) |
|
case EMSGSIZE: |
case EMSGSIZE: |
type = ICMP_UNREACH; |
type = ICMP_UNREACH; |
code = ICMP_UNREACH_NEEDFRAG; |
code = ICMP_UNREACH_NEEDFRAG; |
|
if (ipforward_rt.ro_rt) |
|
destifp = ipforward_rt.ro_rt->rt_ifp; |
ipstat.ips_cantfrag++; |
ipstat.ips_cantfrag++; |
break; |
break; |
|
|
Line 1077 ip_forward(m, srcrt) |
|
Line 1123 ip_forward(m, srcrt) |
|
code = 0; |
code = 0; |
break; |
break; |
} |
} |
icmp_error(mcopy, type, code, dest); |
icmp_error(mcopy, type, code, dest, destifp); |
|
} |
|
|
|
int |
|
ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen) |
|
int *name; |
|
u_int namelen; |
|
void *oldp; |
|
size_t *oldlenp; |
|
void *newp; |
|
size_t newlen; |
|
{ |
|
/* All sysctl names at this level are terminal. */ |
|
if (namelen != 1) |
|
return (ENOTDIR); |
|
|
|
switch (name[0]) { |
|
case IPCTL_FORWARDING: |
|
return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding)); |
|
case IPCTL_SENDREDIRECTS: |
|
return (sysctl_int(oldp, oldlenp, newp, newlen, |
|
&ipsendredirects)); |
|
case IPCTL_DEFTTL: |
|
return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl)); |
|
#ifdef notyet |
|
case IPCTL_DEFMTU: |
|
return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu)); |
|
#endif |
|
default: |
|
return (EOPNOTSUPP); |
|
} |
|
/* NOTREACHED */ |
} |
} |