Check for IPv6 header files.

[tinc] / src / route.c

diff --git a/src/route.c b/src/route.c
index 53cf2d5..b6ec0dc 100644 (file)
--- a/src/route.c
+++ b/src/route.c
@@ -17,7 +17,7 @@
     along with this program; if not, write to the Free Software
     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 
-    $Id: route.c,v 1.1.2.48 2003/03/29 21:58:35 guus Exp $
+    $Id: route.c,v 1.1.2.53 2003/07/06 17:49:49 guus Exp $
 */
 
 #include "config.h"
@@ -38,8 +38,10 @@
 #endif
 #include <netinet/ip.h>
 #include <netinet/ip_icmp.h>
+#ifdef HAVE_NETINET_IP6_H
 #include <netinet/ip6.h>
 #include <netinet/icmp6.h>
+#endif
 #include <netinet/if_ether.h>
 #include <utils.h>
 #include <xalloc.h>
@@ -60,14 +62,29 @@
 
 #include "system.h"
 
+/* Missing definitions */
+
 #ifndef ETHER_ADDR_LEN
 #define ETHER_ADDR_LEN 6
 #endif
 
+#ifndef ICMP_DEST_UNREACH
+#define ICMP_DEST_UNREACH 3
+#endif
+
+#ifndef ICMP_NET_UNKNOWN
+#define ICMP_NET_UNKNOWN 6
+#endif
+
+#ifndef ICMP_NET_UNREACH
+#define ICMP_NET_UNREACH 0
+#endif
+
 int routing_mode = RMODE_ROUTER;
 int priorityinheritance = 0;
 int macexpire = 600;
-subnet_t mymac;
+int overwrite_mac = 0;
+mac_t mymac = {{0xFE, 0xFD, 0, 0, 0, 0}};
 
 /* RFC 1071 */
 
@@ -76,10 +93,13 @@ uint16_t inet_checksum(void *data, int len, uint16_t prevsum)
        uint16_t *p = data;
        uint32_t checksum = prevsum ^ 0xFFFF;
 
-       len /= 2;
-               
-       while(len--)
+       while(len >= 2) {
                checksum += *p++;
+               len -= 2;
+       }
+       
+       if(len)
+               checksum += *(unsigned char *)p;
 
        while(checksum >> 16)
                checksum = (checksum & 0xFFFF) + (checksum >> 16);
@@ -206,8 +226,8 @@ void route_ipv4_unreachable(vpn_packet_t *packet, uint8_t code)
        memcpy(&ip_dst, &hdr->ip_dst, 4);
        oldlen = packet->len - 14;
        
-       if(oldlen >= IP_MSS - sizeof(*hdr) - sizeof(struct icmphdr))
-               oldlen = IP_MSS - sizeof(*hdr) - sizeof(struct icmphdr);
+       if(oldlen >= IP_MSS - sizeof(*hdr) - sizeof(*icmp))
+               oldlen = IP_MSS - sizeof(*hdr) - sizeof(*icmp);
        
        /* Copy first part of original contents to ICMP message */
        
@@ -270,6 +290,8 @@ node_t *route_ipv4(vpn_packet_t *packet)
        return subnet->owner;
 }
 
+#ifdef HAVE_NETINET_IP6_H
+
 /* RFC 2463 */
 
 void route_ipv6_unreachable(vpn_packet_t *packet, uint8_t code)
@@ -338,6 +360,8 @@ void route_ipv6_unreachable(vpn_packet_t *packet, uint8_t code)
        write_packet(packet);
 }
 
+#endif
+
 node_t *route_ipv6(vpn_packet_t *packet)
 {
        subnet_t *subnet;
@@ -358,17 +382,23 @@ node_t *route_ipv6(vpn_packet_t *packet)
                                   ntohs(*(uint16_t *) & packet->data[50]),
                                   ntohs(*(uint16_t *) & packet->data[52]));
                }
+#ifdef HAVE_NETINET_IP6_H
                route_ipv6_unreachable(packet, ICMP6_DST_UNREACH_ADDR);
+#endif
 
                return NULL;
        }
 
+#ifdef HAVE_NETINET_IP6_H
        if(!subnet->owner->status.reachable)
                route_ipv6_unreachable(packet, ICMP6_DST_UNREACH_NOROUTE);
-
+#endif
+       
        return subnet->owner;
 }
 
+#ifdef HAVE_NETINET_IP6_H
+
 /* RFC 2461 */
 
 void route_neighborsol(vpn_packet_t *packet)
@@ -394,7 +424,8 @@ void route_neighborsol(vpn_packet_t *packet)
 
        /* First, snatch the source address from the neighbor solicitation packet */
 
-       memcpy(mymac.net.mac.address.x, packet->data + 6, 6);
+       if(overwrite_mac)
+               memcpy(mymac.x, packet->data + 6, 6);
 
        /* Check if this is a valid neighbor solicitation request */
 
@@ -484,6 +515,8 @@ void route_neighborsol(vpn_packet_t *packet)
        write_packet(packet);
 }
 
+#endif
+
 /* RFC 826 */
 
 void route_arp(vpn_packet_t *packet)
@@ -496,7 +529,8 @@ void route_arp(vpn_packet_t *packet)
 
        /* First, snatch the source address from the ARP packet */
 
-       memcpy(mymac.net.mac.address.x, packet->data + 6, 6);
+       if(overwrite_mac)
+               memcpy(mymac.x, packet->data + 6, 6);
 
        /* This routine generates replies to ARP requests.
           You don't need to set NOARP flag on the interface anymore (which is broken on FreeBSD).
@@ -566,10 +600,12 @@ void route_outgoing(vpn_packet_t *packet)
                                        break;
 
                                case 0x86DD:
+#ifdef HAVE_NETINET_IP6_H
                                        if(packet->data[20] == IPPROTO_ICMPV6 && packet->data[54] == ND_NEIGHBOR_SOLICIT) {
                                                route_neighborsol(packet);
                                                return;
                                        }
+#endif
                                        n = route_ipv6(packet);
                                        break;
 
@@ -625,7 +661,8 @@ void route_incoming(node_t *source, vpn_packet_t *packet)
 
                                if(n) {
                                        if(n == myself) {
-                                               memcpy(packet->data, mymac.net.mac.address.x, 6);
+                                               if(overwrite_mac)
+                                                       memcpy(packet->data, mymac.x, 6);
                                                write_packet(packet);
                                        } else
                                                send_packet(n, packet);