X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Froute.c;h=170f509e46fac88c7e2dd1af60fc425e7f8d93dc;hp=1b6336dcd168488886aaff62b1c17140126be4b4;hb=ac066bb057dcb187bf91670793ba5e6ca456e052;hpb=65247c063b36a76dd68156fe17b017c7460d982f diff --git a/src/route.c b/src/route.c index 1b6336dc..170f509e 100644 --- a/src/route.c +++ b/src/route.c @@ -17,103 +17,134 @@ along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - $Id: route.c,v 1.1.2.9 2001/05/28 08:21:43 guus Exp $ + $Id: route.c,v 1.1.2.20 2001/10/27 13:13:35 guus Exp $ */ #include "config.h" #ifdef HAVE_FREEBSD #include +#endif +#include +#include +#ifdef HAVE_SOLARIS + #include + #define ETHER_ADDR_LEN 6 #else - #include + #include #endif +#include #include #include #include +#include + +#include #include "net.h" #include "connection.h" #include "subnet.h" #include "route.h" +#include "protocol.h" +#include "device.h" #include "system.h" int routing_mode = RMODE_ROUTER; subnet_t mymac; -void learn_mac(connection_t *source, mac_t *address) +void learn_mac(mac_t *address) { subnet_t *subnet; + avl_node_t *node; + connection_t *c; cp subnet = lookup_subnet_mac(address); + + /* If we don't know this MAC address yet, store it */ - if(!subnet) + if(!subnet || subnet->owner!=myself) { + 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; -// subnet->lasttime = gettimeofday(); memcpy(&subnet->net.mac.address, address, sizeof(mac_t)); - subnet_add(source, subnet); + subnet_add(myself, subnet); - if(debug_lvl >= DEBUG_TRAFFIC) + /* And tell all other tinc daemons it's our MAC */ + + for(node = connection_tree->head; node; node = node->next) { - syslog(LOG_DEBUG, _("Learned new MAC address %x:%x:%x:%x:%x:%x from %s (%s)"), - address->x[0], - address->x[1], - address->x[2], - address->x[3], - address->x[4], - address->x[5], - source->name, source->hostname); + c = (connection_t *)node->data; + if(c->status.active) + send_add_subnet(c, subnet); } } } -connection_t *route_mac(connection_t *source, vpn_packet_t *packet) +node_t *route_mac(vpn_packet_t *packet) { subnet_t *subnet; cp /* Learn source address */ - learn_mac(source, (mac_t *)(&packet->data[0])); + learn_mac((mac_t *)(&packet->data[6])); /* Lookup destination address */ - subnet = lookup_subnet_mac((mac_t *)(&packet->data[6])); + subnet = lookup_subnet_mac((mac_t *)(&packet->data[0])); + + if(subnet) + return subnet->owner; + else + return NULL; +} +node_t *route_ipv4(vpn_packet_t *packet) +{ + ipv4_t dest; + subnet_t *subnet; +cp +#ifdef HAVE_SOLARIS + /* The other form gives bus errors on a SparcStation 20. */ + dest = ((packet->data[30] * 0x100 + packet->data[31]) * 0x100 + packet->data[32]) * 0x100 + packet->data[33]; +#else + dest = ntohl(*((unsigned long*)(&packet->data[30]))); +#endif +cp + subnet = lookup_subnet_ipv4(&dest); +cp if(!subnet) { 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]); - } + 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 +cp return subnet->owner; } -connection_t *route_ipv4(vpn_packet_t *packet) +node_t *route_ipv6(vpn_packet_t *packet) { - ipv4_t dest; + ipv6_t dest; subnet_t *subnet; cp - dest = ntohl(*((unsigned long*)(&packet->data[30]))); - - subnet = lookup_subnet_ipv4(&dest); + memcpy(&dest, &packet->data[30], sizeof(ipv6_t)); + subnet = lookup_subnet_ipv6(&dest); +cp 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]); + syslog(LOG_WARNING, _("Cannot route packet: unknown IPv6 destination address")); } return NULL; @@ -122,22 +153,79 @@ cp return subnet->owner; } -connection_t *route_ipv6(vpn_packet_t *packet) +void route_arp(vpn_packet_t *packet) { + struct ether_arp *arp; + subnet_t *subnet; + unsigned char ipbuf[4]; + ipv4_t dest; cp - if(debug_lvl > DEBUG_NOTHING) + /* 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) { - syslog(LOG_WARNING, _("Cannot route packet: IPv6 routing not yet implemented")); - } + 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); + + write_packet(packet); cp - return NULL; } void route_outgoing(vpn_packet_t *packet) { unsigned short int type; - avl_node_t *node; - connection_t *cl; + node_t *n; cp /* FIXME: multicast? */ @@ -148,11 +236,14 @@ cp switch(type) { case 0x0800: - cl = route_ipv4(packet); + n = route_ipv4(packet); break; case 0x86DD: - cl = route_ipv6(packet); + n = route_ipv6(packet); break; + case 0x0806: + route_arp(packet); + return; default: if(debug_lvl >= DEBUG_TRAFFIC) { @@ -160,38 +251,55 @@ cp } return; } - if(cl) - send_packet(cl, packet); + if(n) + send_packet(n, packet); break; case RMODE_SWITCH: - cl = route_mac(myself, packet); - if(cl) - send_packet(cl, packet); + n = route_mac(packet); + if(n) + send_packet(n, packet); + else + broadcast_packet(myself, packet); break; case RMODE_HUB: - for(node = connection_tree->head; node; node = node->next) - { - cl = (connection_t *)node->data; - if(cl->status.active) - send_packet(cl, packet); - } + broadcast_packet(myself, packet); break; } } -void route_incoming(connection_t *source, vpn_packet_t *packet) +void route_incoming(node_t *source, vpn_packet_t *packet) { switch(routing_mode) { case RMODE_ROUTER: - memcpy(packet->data, mymac.net.mac.address.x, 6); + memcpy(packet->data, mymac.net.mac.address.x, 6); /* Override destination address to make the kernel accept it */ + write_packet(packet); break; case RMODE_SWITCH: - learn_mac(source, (mac_t *)(&packet->data[0])); + { + subnet_t *subnet; + + subnet = lookup_subnet_mac((mac_t *)(&packet->data[0])); + + if(subnet) + { + if(subnet->owner == myself) + write_packet(packet); + else + send_packet(subnet->owner, packet); + } + else + { + broadcast_packet(source, packet); + write_packet(packet); + } + } + break; + case RMODE_HUB: + broadcast_packet(source, packet); /* Spread it on */ + write_packet(packet); break; } - - accept_packet(packet); }