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ip_input.c (7090) ip_input.c (7091)
1/*
2 * Copyright (c) 1982, 1986, 1988, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

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26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
1/*
2 * Copyright (c) 1982, 1986, 1988, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

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26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
34 * $Id: ip_input.c,v 1.17 1995/02/14 23:04:52 wollman Exp $
34 * $Id: ip_input.c,v 1.18 1995/03/16 18:14:55 bde Exp $
35 */
36
37#include <sys/param.h>
38#include <sys/systm.h>
39#include <sys/malloc.h>
40#include <sys/mbuf.h>
41#include <sys/domain.h>
42#include <sys/protosw.h>
43#include <sys/socket.h>
44#include <sys/errno.h>
45#include <sys/time.h>
46#include <sys/kernel.h>
35 */
36
37#include <sys/param.h>
38#include <sys/systm.h>
39#include <sys/malloc.h>
40#include <sys/mbuf.h>
41#include <sys/domain.h>
42#include <sys/protosw.h>
43#include <sys/socket.h>
44#include <sys/errno.h>
45#include <sys/time.h>
46#include <sys/kernel.h>
47#include <sys/syslog.h>
48
47#include <vm/vm.h>
48#include <sys/sysctl.h>
49
50#include <net/if.h>
51#include <net/route.h>
52
53#include <netinet/in.h>
54#include <netinet/in_systm.h>

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72#endif /* GATEWAY */
73#endif /* IPFORWARDING */
74#ifndef IPSENDREDIRECTS
75#define IPSENDREDIRECTS 1
76#endif
77int ipforwarding = IPFORWARDING;
78int ipsendredirects = IPSENDREDIRECTS;
79int ip_defttl = IPDEFTTL;
49#include <vm/vm.h>
50#include <sys/sysctl.h>
51
52#include <net/if.h>
53#include <net/route.h>
54
55#include <netinet/in.h>
56#include <netinet/in_systm.h>

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74#endif /* GATEWAY */
75#endif /* IPFORWARDING */
76#ifndef IPSENDREDIRECTS
77#define IPSENDREDIRECTS 1
78#endif
79int ipforwarding = IPFORWARDING;
80int ipsendredirects = IPSENDREDIRECTS;
81int ip_defttl = IPDEFTTL;
82int ip_dosourceroute = 0;
80#ifdef DIAGNOSTIC
81int ipprintfs = 0;
82#endif
83
84extern struct domain inetdomain;
85extern struct protosw inetsw[];
86u_char ip_protox[IPPROTO_MAX];
87int ipqmaxlen = IFQ_MAXLEN;

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101int ip_nhops = 0;
102static struct ip_srcrt {
103 struct in_addr dst; /* final destination */
104 char nop; /* one NOP to align */
105 char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
106 struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
107} ip_srcrt;
108
83#ifdef DIAGNOSTIC
84int ipprintfs = 0;
85#endif
86
87extern struct domain inetdomain;
88extern struct protosw inetsw[];
89u_char ip_protox[IPPROTO_MAX];
90int ipqmaxlen = IFQ_MAXLEN;

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104int ip_nhops = 0;
105static struct ip_srcrt {
106 struct in_addr dst; /* final destination */
107 char nop; /* one NOP to align */
108 char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
109 struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
110} ip_srcrt;
111
109#ifdef GATEWAY
110extern int if_index;
111u_long *ip_ifmatrix;
112#endif
113
114static void save_rte __P((u_char *, struct in_addr));
115/*
116 * IP initialization: fill in IP protocol switch table.
117 * All protocols not implemented in kernel go to raw IP protocol handler.
118 */
119void
120ip_init()
121{

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130 for (pr = inetdomain.dom_protosw;
131 pr < inetdomain.dom_protoswNPROTOSW; pr++)
132 if (pr->pr_domain->dom_family == PF_INET &&
133 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
134 ip_protox[pr->pr_protocol] = pr - inetsw;
135 ipq.next = ipq.prev = &ipq;
136 ip_id = time.tv_sec & 0xffff;
137 ipintrq.ifq_maxlen = ipqmaxlen;
112static void save_rte __P((u_char *, struct in_addr));
113/*
114 * IP initialization: fill in IP protocol switch table.
115 * All protocols not implemented in kernel go to raw IP protocol handler.
116 */
117void
118ip_init()
119{

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128 for (pr = inetdomain.dom_protosw;
129 pr < inetdomain.dom_protoswNPROTOSW; pr++)
130 if (pr->pr_domain->dom_family == PF_INET &&
131 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
132 ip_protox[pr->pr_protocol] = pr - inetsw;
133 ipq.next = ipq.prev = &ipq;
134 ip_id = time.tv_sec & 0xffff;
135 ipintrq.ifq_maxlen = ipqmaxlen;
138#ifdef GATEWAY
139 i = (if_index + 1) * (if_index + 1) * sizeof (u_long);
140 ip_ifmatrix = (u_long *) malloc(i, M_RTABLE, M_WAITOK);
141 bzero((char *)ip_ifmatrix, i);
142#endif
143}
144
145struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
146struct route ipforward_rt;
147
148/*
149 * Ip input routine. Checksum and byte swap header. If fragmented
150 * try to reassemble. Process options. Pass to next level.

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741 off--; /* 0 origin */
742 if (off > optlen - sizeof(struct in_addr)) {
743 /*
744 * End of source route. Should be for us.
745 */
746 save_rte(cp, ip->ip_src);
747 break;
748 }
136}
137
138struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
139struct route ipforward_rt;
140
141/*
142 * Ip input routine. Checksum and byte swap header. If fragmented
143 * try to reassemble. Process options. Pass to next level.

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734 off--; /* 0 origin */
735 if (off > optlen - sizeof(struct in_addr)) {
736 /*
737 * End of source route. Should be for us.
738 */
739 save_rte(cp, ip->ip_src);
740 break;
741 }
742
743 if (!ip_dosourceroute) {
744 char buf[4*sizeof "123"];
745 strcpy(buf, inet_ntoa(ip->ip_dst));
746
747 log(LOG_WARNING,
748 "attempted source route from %s to %s\n",
749 inet_ntoa(ip->ip_src), buf);
750 type = ICMP_UNREACH;
751 code = ICMP_UNREACH_SRCFAIL;
752 goto bad;
753 }
754
749 /*
750 * locate outgoing interface
751 */
752 bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
753 sizeof(ipaddr.sin_addr));
755 /*
756 * locate outgoing interface
757 */
758 bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
759 sizeof(ipaddr.sin_addr));
760
754 if (opt == IPOPT_SSRR) {
755#define INA struct in_ifaddr *
756#define SA struct sockaddr *
757 if ((ia = (INA)ifa_ifwithdstaddr((SA)&ipaddr)) == 0)
758 ia = (INA)ifa_ifwithnet((SA)&ipaddr);
759 } else
760 ia = ip_rtaddr(ipaddr.sin_addr);
761 if (ia == 0) {

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1086 }
1087
1088 /*
1089 * Save at most 64 bytes of the packet in case
1090 * we need to generate an ICMP message to the src.
1091 */
1092 mcopy = m_copy(m, 0, imin((int)ip->ip_len, 64));
1093
761 if (opt == IPOPT_SSRR) {
762#define INA struct in_ifaddr *
763#define SA struct sockaddr *
764 if ((ia = (INA)ifa_ifwithdstaddr((SA)&ipaddr)) == 0)
765 ia = (INA)ifa_ifwithnet((SA)&ipaddr);
766 } else
767 ia = ip_rtaddr(ipaddr.sin_addr);
768 if (ia == 0) {

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1093 }
1094
1095 /*
1096 * Save at most 64 bytes of the packet in case
1097 * we need to generate an ICMP message to the src.
1098 */
1099 mcopy = m_copy(m, 0, imin((int)ip->ip_len, 64));
1100
1094#ifdef bogus
1095#ifdef GATEWAY
1096 ip_ifmatrix[rt->rt_ifp->if_index +
1097 if_index * m->m_pkthdr.rcvif->if_index]++;
1098#endif
1099#endif
1100 /*
1101 * If forwarding packet using same interface that it came in on,
1102 * perhaps should send a redirect to sender to shortcut a hop.
1103 * Only send redirect if source is sending directly to us,
1104 * and if packet was not source routed (or has any options).
1105 * Also, don't send redirect if forwarding using a default route
1106 * or a route modified by a redirect.
1107 */

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1197 switch (name[0]) {
1198 case IPCTL_FORWARDING:
1199 return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
1200 case IPCTL_SENDREDIRECTS:
1201 return (sysctl_int(oldp, oldlenp, newp, newlen,
1202 &ipsendredirects));
1203 case IPCTL_DEFTTL:
1204 return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
1101 /*
1102 * If forwarding packet using same interface that it came in on,
1103 * perhaps should send a redirect to sender to shortcut a hop.
1104 * Only send redirect if source is sending directly to us,
1105 * and if packet was not source routed (or has any options).
1106 * Also, don't send redirect if forwarding using a default route
1107 * or a route modified by a redirect.
1108 */

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1198 switch (name[0]) {
1199 case IPCTL_FORWARDING:
1200 return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
1201 case IPCTL_SENDREDIRECTS:
1202 return (sysctl_int(oldp, oldlenp, newp, newlen,
1203 &ipsendredirects));
1204 case IPCTL_DEFTTL:
1205 return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
1206 case IPCTL_SOURCEROUTE:
1207 return (sysctl_int(oldp, oldlenp, newp, newlen,
1208 &ip_dosourceroute));
1205#ifdef notyet
1206 case IPCTL_DEFMTU:
1207 return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
1208#endif
1209 case IPCTL_RTEXPIRE:
1210 return (sysctl_int(oldp, oldlenp, newp, newlen,
1211 &rtq_reallyold));
1212 case IPCTL_RTMINEXPIRE:

--- 32 unchanged lines hidden --- 		1209#ifdef notyet
1210 case IPCTL_DEFMTU:
1211 return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
1212#endif
1213 case IPCTL_RTEXPIRE:
1214 return (sysctl_int(oldp, oldlenp, newp, newlen,
1215 &rtq_reallyold));
1216 case IPCTL_RTMINEXPIRE:

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