X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Froute.c;h=9a555de436a2bf3878c3259d2eecb7a4eab72063;hp=0509b962ca4a8279b710662cd68c237e814652b6;hb=9645cabc8e8364ed4df187fab8065b0991afa6af;hpb=698191fd2f512f3618e2d60592fcd57cd750b965 diff --git a/src/route.c b/src/route.c index 0509b962..9a555de4 100644 --- a/src/route.c +++ b/src/route.c @@ -1,7 +1,7 @@ /* route.c -- routing - Copyright (C) 2000 Ivo Timmermans , - 2000 Guus Sliepen + Copyright (C) 2000,2001 Ivo Timmermans , + 2000,2001 Guus Sliepen This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -17,96 +17,272 @@ along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - $Id: route.c,v 1.1.2.2 2000/11/04 22:57:33 guus Exp $ + $Id: route.c,v 1.1.2.15 2001/07/01 09:21:14 guus Exp $ */ #include "config.h" +#ifdef HAVE_FREEBSD + #include +#endif +#include +#include +#ifdef HAVE_SOLARIS + #include + #define ETHER_ADDR_LEN 6 +#else + #include +#endif +#include #include #include +#include +#include + +#include #include "net.h" -#include "connlist.h" +#include "connection.h" +#include "subnet.h" +#include "route.h" +#include "protocol.h" #include "system.h" -int routing_mode = 0; /* Will be used to determine if we route by MAC or by payload's protocol */ +int routing_mode = RMODE_ROUTER; +subnet_t mymac; -conn_list_t *route_packet(vpn_packet_t *packet) +void learn_mac(mac_t *address) { - unsigned short type; + subnet_t *subnet; + avl_node_t *node; + connection_t *p; cp - type = ntohs(*((unsigned short*)(&packet.data[12]))) + subnet = lookup_subnet_mac(address); - if(routing_mode) + /* If we don't know this MAC address yet, store it */ + + if(!subnet || subnet->owner!=myself) { - return route_mac(packet); - } + if(debug_lvl >= DEBUG_TRAFFIC) + syslog(LOG_INFO, _("Learned new MAC address %hhx:%hhx:%hhx:%hhx:%hhx:%hhx"), + address->x[0], address->x[1], address->x[2], address->x[3], address->x[4], address->x[5]); + + subnet = new_subnet(); + subnet->type = SUBNET_MAC; + memcpy(&subnet->net.mac.address, address, sizeof(mac_t)); + subnet_add(myself, subnet); - switch(type) - { - case 0x0800: - return route_ipv4(packet); - case 0x86DD: - return route_ipv6(packet); -/* - case 0x8137: - return route_ipx(packet); - case 0x0806: - return route_arp(packet); -*/ - default: - if(debug_lvl >= DEBUG_TRAFFIC) - { - syslog(LOG_WARNING, _("Cannot route packet: unknown type %hx"), type); - } - return NULL; - } + /* And tell all other tinc daemons it's our MAC */ + + for(node = connection_tree->head; node; node = node->next) + { + p = (connection_t *)node->data; + if(p->status.meta && p->status.active && p!= myself) + send_add_subnet(p, subnet); + } + } } -conn_list_t *route_mac(vpn_packet_t *packet) +connection_t *route_mac(vpn_packet_t *packet) { - conn_list_t *cl; + subnet_t *subnet; cp - cl = lookup_subnet_mac((mac_t *)(&packet.data[6])); - if(!cl) - if(debug_lvl >= DEBUG_TRAFFIC) - { - syslog(LOG_WARNING, _("Cannot route packet: unknown destination address %x:%x:%x:%x:%x:%x"), - packet.data[6], - packet.data[7], - packet.data[8], - packet.data[9], - packet.data[10], - packet.data[11]); - } -cp - return cl; -} + /* Learn source address */ + learn_mac((mac_t *)(&packet->data[6])); + + /* Lookup destination address */ + + subnet = lookup_subnet_mac((mac_t *)(&packet->data[0])); -conn_list_t *route_ipv4(vpn_packet_t *packet) + if(subnet) + return subnet->owner; + else + return NULL; +} + +connection_t *route_ipv4(vpn_packet_t *packet) { ipv4_t dest; - conn_list_t *cl; + subnet_t *subnet; cp - dest = ntohl(*((unsigned long*)(&packet.data[30]); + dest = ntohl(*((unsigned long*)(&packet->data[30]))); - cl = lookup_subnet_ipv4(dest); - if(!cl) - if(debug_lvl >= DEBUG_TRAFFIC) - { - syslog(LOG_WARNING, _("Cannot route packet: unknown destination address %d.%d.%d.%d"), - packet.data[30], packet.data[31], packet.data[32], packet.data[33]); - } + subnet = lookup_subnet_ipv4(&dest); + + if(!subnet) + { + if(debug_lvl >= DEBUG_TRAFFIC) + { + syslog(LOG_WARNING, _("Cannot route packet: unknown destination address %d.%d.%d.%d"), + packet->data[30], packet->data[31], packet->data[32], packet->data[33]); + } + + return NULL; + } cp - return cl; + return subnet->owner; } -conn_list_t *route_ipv6(vpn_packet_t *packet) +connection_t *route_ipv6(vpn_packet_t *packet) { cp - syslog(LOG_WARNING, _("Cannot route packet: IPv6 routing not implemented yet")); + if(debug_lvl > DEBUG_NOTHING) + { + syslog(LOG_WARNING, _("Cannot route packet: IPv6 routing not yet implemented")); + } cp return NULL; } + +void route_arp(vpn_packet_t *packet) +{ + struct ether_arp *arp; + subnet_t *subnet; + unsigned char ipbuf[4]; + ipv4_t dest; +cp + /* First, snatch the source address from the ARP packet */ + + memcpy(mymac.net.mac.address.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). + Most of the code here is taken from choparp.c by Takamichi Tateoka (tree@mma.club.uec.ac.jp) + */ + + arp = (struct ether_arp *)(packet->data + 14); + + /* Check if this is a valid ARP request */ + + if(ntohs(arp->arp_hrd) != ARPHRD_ETHER || + ntohs(arp->arp_pro) != ETHERTYPE_IP || + (int) (arp->arp_hln) != ETHER_ADDR_LEN || + (int) (arp->arp_pln) != 4 || + ntohs(arp->arp_op) != ARPOP_REQUEST ) + { + if(debug_lvl > DEBUG_TRAFFIC) + { + syslog(LOG_WARNING, _("Cannot route packet: received unknown type ARP request")); + } + return; + } + + /* Check if the IP address exists on the VPN */ + + dest = ntohl(*((unsigned long*)(arp->arp_tpa))); + subnet = lookup_subnet_ipv4(&dest); + + if(!subnet) + { + if(debug_lvl >= DEBUG_TRAFFIC) + { + syslog(LOG_WARNING, _("Cannot route packet: ARP request for unknown address %d.%d.%d.%d"), + arp->arp_tpa[0], arp->arp_tpa[1], arp->arp_tpa[2], arp->arp_tpa[3]); + } + + return; + } + + /* Check if it is for our own subnet */ + + if(subnet->owner == myself) + return; /* silently ignore */ + + memcpy(packet->data, packet->data + ETHER_ADDR_LEN, ETHER_ADDR_LEN); /* copy destination address */ + packet->data[ETHER_ADDR_LEN*2 - 1] ^= 0xFF; /* mangle source address so it looks like it's not from us */ + + memcpy(ipbuf, arp->arp_tpa, 4); /* save protocol addr */ + memcpy(arp->arp_tpa, arp->arp_spa, 4); /* swap destination and source protocol address */ + memcpy(arp->arp_spa, ipbuf, 4); /* ... */ + + memcpy(arp->arp_tha, arp->arp_sha, 10); /* set target hard/proto addr */ + memcpy(arp->arp_sha, packet->data + ETHER_ADDR_LEN, ETHER_ADDR_LEN); /* add fake source hard addr */ + arp->arp_op = htons(ARPOP_REPLY); + + accept_packet(packet); +cp +} + +void route_outgoing(vpn_packet_t *packet) +{ + unsigned short int type; + connection_t *cl; +cp + /* FIXME: multicast? */ + + switch(routing_mode) + { + case RMODE_ROUTER: + type = ntohs(*((unsigned short*)(&packet->data[12]))); + switch(type) + { + case 0x0800: + cl = route_ipv4(packet); + break; + case 0x86DD: + cl = route_ipv6(packet); + break; + case 0x0806: + route_arp(packet); + return; + default: + if(debug_lvl >= DEBUG_TRAFFIC) + { + syslog(LOG_WARNING, _("Cannot route packet: unknown type %hx"), type); + } + return; + } + if(cl) + send_packet(cl, packet); + break; + + case RMODE_SWITCH: + cl = route_mac(packet); + if(cl) + send_packet(cl, packet); + else + broadcast_packet(myself, packet); + break; + + case RMODE_HUB: + broadcast_packet(myself, packet); + break; + } +} + +void route_incoming(connection_t *source, vpn_packet_t *packet) +{ + switch(routing_mode) + { + case RMODE_ROUTER: + memcpy(packet->data, mymac.net.mac.address.x, 6); /* Override destination address to make the kernel accept it */ + accept_packet(packet); + break; + case RMODE_SWITCH: + { + subnet_t *subnet; + + subnet = lookup_subnet_mac((mac_t *)(&packet->data[0])); + + if(subnet) + { + if(subnet->owner == myself) + accept_packet(packet); + else + send_packet(subnet->owner, packet); + } + else + { + broadcast_packet(source, packet); + accept_packet(packet); + } + } + break; + case RMODE_HUB: + broadcast_packet(source,packet); /* Spread it on */ + accept_packet(packet); + break; + } +}