X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Froute.c;h=1cdf964a4cd46ec9b6e198e38ec13a820d2e88cc;hp=0799c48c6e097dc0e9995223107967eab1def0b3;hb=1401faf608e1c8af0d0754e545b0ec79d2bd5d93;hpb=f219f156cf13fd30369d7cd4632c406ffd6ff628 diff --git a/src/route.c b/src/route.c index 0799c48c..1cdf964a 100644 --- a/src/route.c +++ b/src/route.c @@ -1,7 +1,7 @@ /* route.c -- routing - Copyright (C) 2000-2002 Ivo Timmermans , - 2000-2002 Guus Sliepen + Copyright (C) 2000-2002 Ivo Timmermans , + 2000-2002 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 @@ -17,31 +17,38 @@ along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - $Id: route.c,v 1.1.2.32 2002/03/12 14:25:04 guus Exp $ + $Id: route.c,v 1.1.2.55 2003/07/06 23:16:29 guus Exp $ */ #include "config.h" -#if defined(HAVE_FREEBSD) || defined(HAVE_OPENBSD) - #include +#ifdef HAVE_SYS_PARAM_H +#include #endif #include #include -#if defined(HAVE_SOLARIS) || defined(HAVE_OPENBSD) - #include - #define ETHER_ADDR_LEN 6 -#else - #include +#ifdef HAVE_NET_IF_H +#include #endif -#ifdef NEIGHBORSOL +#ifdef HAVE_NET_ETHERNET_H +#include +#endif +#ifdef HAVE_NETINET_IN_SYSTM_H +#include +#endif +#include +#include +#ifdef HAVE_NETINET_IP6_H #include #include #endif #include #include #include -#include #include +#ifdef HAVE_INTTYPES_H +#include +#endif #include @@ -51,450 +58,622 @@ #include "route.h" #include "protocol.h" #include "device.h" +#include "logger.h" #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; +static mac_t mymac = {{0xFE, 0xFD, 0, 0, 0, 0}}; -void learn_mac(mac_t *address) +/* RFC 1071 */ + +static uint16_t inet_checksum(void *data, int len, uint16_t prevsum) { - 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 || subnet->owner!=myself) - { - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_INFO, _("Learned new MAC address %hx:%hx:%hx:%hx:%hx:%hx"), - 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); - - /* And tell all other tinc daemons it's our MAC */ - - for(node = connection_tree->head; node; node = node->next) - { - c = (connection_t *)node->data; - if(c->status.active) - send_add_subnet(c, subnet); - } - } - - subnet->net.mac.lastseen = now; + uint16_t *p = data; + uint32_t checksum = prevsum ^ 0xFFFF; + + while(len >= 2) { + checksum += *p++; + len -= 2; + } + + if(len) + checksum += *(unsigned char *)p; + + while(checksum >> 16) + checksum = (checksum & 0xFFFF) + (checksum >> 16); + + return ~checksum; +} + +static int ratelimit(void) { + static time_t lasttime = 0; + + if(lasttime == now) + return 1; + + lasttime = now; + return 0; +} + +static 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 || subnet->owner != myself) { + logger(DEBUG_TRAFFIC, LOG_INFO, _("Learned new MAC address %hx:%hx:%hx:%hx:%hx:%hx"), + 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); + + /* And tell all other tinc daemons it's our MAC */ + + for(node = connection_tree->head; node; node = node->next) { + c = (connection_t *) node->data; + if(c->status.active) + send_add_subnet(c, subnet); + } + } + + subnet->net.mac.lastseen = now; } void age_mac(void) { - subnet_t *s; - connection_t *c; - avl_node_t *node, *next, *node2; -cp - for(node = myself->subnet_tree->head; node; node = next) - { - next = node->next; - s = (subnet_t *)node->data; - if(s->type == SUBNET_MAC && s->net.mac.lastseen && s->net.mac.lastseen + macexpire < now) - { - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_INFO, _("MAC address %hx:%hx:%hx:%hx:%hx:%hx expired"), - s->net.mac.address.x[0], s->net.mac.address.x[1], s->net.mac.address.x[2], s->net.mac.address.x[3], s->net.mac.address.x[4], s->net.mac.address.x[5]); - for(node2 = connection_tree->head; node2; node2 = node2->next) - { - c = (connection_t *)node2->data; - if(c->status.active) - send_del_subnet(c, s); - } - subnet_del(myself, s); + subnet_t *s; + connection_t *c; + avl_node_t *node, *next, *node2; + + cp(); + + for(node = myself->subnet_tree->head; node; node = next) { + next = node->next; + s = (subnet_t *) node->data; + if(s->type == SUBNET_MAC && s->net.mac.lastseen && s->net.mac.lastseen + macexpire < now) { + logger(DEBUG_TRAFFIC, LOG_INFO, _("MAC address %hx:%hx:%hx:%hx:%hx:%hx expired"), + s->net.mac.address.x[0], s->net.mac.address.x[1], + s->net.mac.address.x[2], s->net.mac.address.x[3], + s->net.mac.address.x[4], s->net.mac.address.x[5]); + + for(node2 = connection_tree->head; node2; node2 = node2->next) { + c = (connection_t *) node2->data; + if(c->status.active) + send_del_subnet(c, s); + } + + subnet_del(myself, s); + } } - } -cp } -node_t *route_mac(vpn_packet_t *packet) +static node_t *route_mac(vpn_packet_t *packet) { - subnet_t *subnet; -cp - /* Learn source address */ - - learn_mac((mac_t *)(&packet->data[6])); - - /* Lookup destination address */ - - subnet = lookup_subnet_mac((mac_t *)(&packet->data[0])); - - if(subnet) - return subnet->owner; - else - return NULL; + subnet_t *subnet; + + cp(); + + /* Learn source address */ + + learn_mac((mac_t *)(&packet->data[6])); + + /* Lookup destination address */ + + 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) +/* RFC 792 */ + +static void route_ipv4_unreachable(vpn_packet_t *packet, uint8_t code) { - subnet_t *subnet; -cp - if(priorityinheritance) - packet->priority = packet->data[15]; - - subnet = lookup_subnet_ipv4((ipv4_t *)&packet->data[30]); -cp - if(!subnet) - { - if(debug_lvl >= DEBUG_TRAFFIC) - { - syslog(LOG_WARNING, _("Cannot route packet: unknown IPv4 destination address %d.%d.%d.%d"), - packet->data[30], packet->data[31], packet->data[32], packet->data[33]); - } - - return NULL; - } -cp - return subnet->owner; + struct ip *hdr; + struct icmp *icmp; + + struct in_addr ip_src; + struct in_addr ip_dst; + uint32_t oldlen; + + if(ratelimit()) + return; + + cp(); + + hdr = (struct ip *)(packet->data + 14); + icmp = (struct icmp *)(packet->data + 14 + 20); + + /* Remember original source and destination */ + + memcpy(&ip_src, &hdr->ip_src, 4); + memcpy(&ip_dst, &hdr->ip_dst, 4); + oldlen = packet->len - 14; + + if(oldlen >= IP_MSS - sizeof(*hdr) - sizeof(*icmp)) + oldlen = IP_MSS - sizeof(*hdr) - sizeof(*icmp); + + /* Copy first part of original contents to ICMP message */ + + memmove(&icmp->icmp_ip, hdr, oldlen); + + /* Fill in IPv4 header */ + + hdr->ip_v = 4; + hdr->ip_hl = sizeof(*hdr) / 4; + hdr->ip_tos = 0; + hdr->ip_len = htons(20 + 8 + oldlen); + hdr->ip_id = 0; + hdr->ip_off = 0; + hdr->ip_ttl = 255; + hdr->ip_p = IPPROTO_ICMP; + hdr->ip_sum = 0; + memcpy(&hdr->ip_src, &ip_dst, 4); + memcpy(&hdr->ip_dst, &ip_src, 4); + + hdr->ip_sum = inet_checksum(hdr, 20, ~0); + + /* Fill in ICMP header */ + + icmp->icmp_type = ICMP_DEST_UNREACH; + icmp->icmp_code = code; + icmp->icmp_cksum = 0; + + icmp->icmp_cksum = inet_checksum(icmp, 8 + oldlen, ~0); + + packet->len = 14 + 20 + 8 + oldlen; + + write_packet(packet); } -node_t *route_ipv6(vpn_packet_t *packet) +static node_t *route_ipv4(vpn_packet_t *packet) { - subnet_t *subnet; -cp - subnet = lookup_subnet_ipv6((ipv6_t *)&packet->data[38]); -cp - if(!subnet) - { - if(debug_lvl >= DEBUG_TRAFFIC) - { - syslog(LOG_WARNING, _("Cannot route packet: unknown IPv6 destination address %hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx"), - ntohs(*(short unsigned int *)&packet->data[38]), - ntohs(*(short unsigned int *)&packet->data[40]), - ntohs(*(short unsigned int *)&packet->data[42]), - ntohs(*(short unsigned int *)&packet->data[44]), - ntohs(*(short unsigned int *)&packet->data[46]), - ntohs(*(short unsigned int *)&packet->data[48]), - ntohs(*(short unsigned int *)&packet->data[50]), - ntohs(*(short unsigned int *)&packet->data[52])); - } - - return NULL; - } -cp - return subnet->owner; + subnet_t *subnet; + + cp(); + + if(priorityinheritance) + packet->priority = packet->data[15]; + + subnet = lookup_subnet_ipv4((ipv4_t *) & packet->data[30]); + + if(!subnet) { + logger(DEBUG_TRAFFIC, LOG_WARNING, _("Cannot route packet: unknown IPv4 destination address %d.%d.%d.%d"), + packet->data[30], packet->data[31], packet->data[32], + packet->data[33]); + + route_ipv4_unreachable(packet, ICMP_NET_UNKNOWN); + return NULL; + } + + if(!subnet->owner->status.reachable) + route_ipv4_unreachable(packet, ICMP_NET_UNREACH); + + return subnet->owner; } -#ifdef NEIGHBORSOL -unsigned short int ipv6_cksum(short int *data, int len, unsigned short int cksum) +#ifdef HAVE_NETINET_IP6_H + +/* RFC 2463 */ + +static void route_ipv6_unreachable(vpn_packet_t *packet, uint8_t code) { - while(len--) - { - cksum += ntohs(*data++); - } - return cksum; + struct ip6_hdr *hdr; + struct icmp6_hdr *icmp; + uint16_t checksum; + + struct { + struct in6_addr ip6_src; /* source address */ + struct in6_addr ip6_dst; /* destination address */ + uint32_t length; + uint32_t next; + } pseudo; + + if(ratelimit()) + return; + + cp(); + + hdr = (struct ip6_hdr *)(packet->data + 14); + icmp = (struct icmp6_hdr *)(packet->data + 14 + sizeof(*hdr)); + + /* Remember original source and destination */ + + memcpy(&pseudo.ip6_src, &hdr->ip6_dst, 16); + memcpy(&pseudo.ip6_dst, &hdr->ip6_src, 16); + pseudo.length = ntohs(hdr->ip6_plen) + sizeof(*hdr); + + if(pseudo.length >= IP_MSS - sizeof(*hdr) - sizeof(*icmp)) + pseudo.length = IP_MSS - sizeof(*hdr) - sizeof(*icmp); + + /* Copy first part of original contents to ICMP message */ + + memmove(((char *)icmp) + sizeof(*icmp), hdr, pseudo.length); + + /* Fill in IPv6 header */ + + hdr->ip6_flow = htonl(0x60000000UL); + hdr->ip6_plen = htons(sizeof(*icmp) + pseudo.length); + hdr->ip6_nxt = IPPROTO_ICMPV6; + hdr->ip6_hlim = 255; + memcpy(&hdr->ip6_dst, &pseudo.ip6_dst, 16); + memcpy(&hdr->ip6_src, &pseudo.ip6_src, 16); + + /* Fill in ICMP header */ + + icmp->icmp6_type = ICMP6_DST_UNREACH; + icmp->icmp6_code = code; + icmp->icmp6_cksum = 0; + + /* Create pseudo header */ + + pseudo.length = htonl(sizeof(*icmp) + pseudo.length); + pseudo.next = htonl(IPPROTO_ICMPV6); + + /* Generate checksum */ + + checksum = inet_checksum(&pseudo, sizeof(pseudo), ~0); + checksum = inet_checksum(icmp, ntohl(pseudo.length), checksum); + + icmp->icmp6_cksum = checksum; + + packet->len = 14 + sizeof(*hdr) + ntohl(pseudo.length); + + write_packet(packet); } -void route_neighborsol(vpn_packet_t *packet) +#endif + +static node_t *route_ipv6(vpn_packet_t *packet) { - struct ip6_hdr *hdr; - struct nd_neighbor_solicit *ns; - struct nd_opt_hdr *opt; - subnet_t *subnet; - short int cksum; - - struct { - struct in6_addr ip6_src; /* source address */ - struct in6_addr ip6_dst; /* destination address */ - uint32_t length; - uint8_t junk[4]; - } pseudo; - -cp - hdr = (struct ip6_hdr *)(packet->data + 14); - ns = (struct nd_neighbor_solicit *)(packet->data + 14 + sizeof(struct ip6_hdr)); - opt = (struct nd_opt_hdr *)(packet->data + 14 + sizeof(struct ip6_hdr) + sizeof(struct nd_neighbor_solicit)); - - /* First, snatch the source address from the neighbor solicitation packet */ - - memcpy(mymac.net.mac.address.x, packet->data + 6, 6); - - /* Check if this is a valid neighbor solicitation request */ - - if(ns->nd_ns_hdr.icmp6_type != ND_NEIGHBOR_SOLICIT || - opt->nd_opt_type != ND_OPT_SOURCE_LINKADDR) - { - if(debug_lvl > DEBUG_TRAFFIC) - { - syslog(LOG_WARNING, _("Cannot route packet: received unknown type neighbor solicitation request")); - } - return; - } - - /* Check if the IPv6 address exists on the VPN */ -#if 0 - subnet = lookup_subnet_ipv6((ipv6_t *)&ns->nd_ns_target); - - if(!subnet) - { - if(debug_lvl >= DEBUG_TRAFFIC) - { - syslog(LOG_WARNING, _("Cannot route packet: neighbor solicitation request for unknown address %hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx"), - ntohs(ns->nd_ns_target.s6_addr16[0]), ntohs(ns->nd_ns_target.s6_addr16[1]), ntohs(ns->nd_ns_target.s6_addr16[2]), ntohs(ns->nd_ns_target.s6_addr16[3]), - ntohs(ns->nd_ns_target.s6_addr16[4]), ntohs(ns->nd_ns_target.s6_addr16[5]), ntohs(ns->nd_ns_target.s6_addr16[6]), ntohs(ns->nd_ns_target.s6_addr16[7])); - } - - return; - } - - /* Check if it is for our own subnet */ - - if(subnet->owner == myself) - return; /* silently ignore */ + subnet_t *subnet; + + cp(); + + subnet = lookup_subnet_ipv6((ipv6_t *) & packet->data[38]); + + if(!subnet) { + logger(DEBUG_TRAFFIC, LOG_WARNING, _("Cannot route packet: unknown IPv6 destination address %hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx"), + ntohs(*(uint16_t *) & packet->data[38]), + ntohs(*(uint16_t *) & packet->data[40]), + ntohs(*(uint16_t *) & packet->data[42]), + ntohs(*(uint16_t *) & packet->data[44]), + ntohs(*(uint16_t *) & packet->data[46]), + ntohs(*(uint16_t *) & packet->data[48]), + 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 - - syslog(LOG_DEBUG, "Neighbor solicitation request with checksum %hx", ntohs(ns->nd_ns_hdr.icmp6_cksum)); - - /* Create pseudo header */ - - memcpy(&pseudo.ip6_src, &hdr->ip6_src, 16); - memcpy(&pseudo.ip6_dst, &hdr->ip6_dst, 16); - pseudo.length = htonl(sizeof(*ns)); - pseudo.junk[0] = pseudo.junk[1] = pseudo.junk[2] = 0; - pseudo.junk[3] = IPPROTO_ICMPV6; - - /* Generate checksum */ - - ns->nd_ns_hdr.icmp6_cksum = 0; - - cksum = ipv6_cksum((short int *)&pseudo, sizeof(pseudo)/2, 0); - - syslog(LOG_DEBUG, "Our checksum %hx", cksum); - - cksum = ipv6_cksum((short int *)ns, sizeof(*ns)/2, cksum); - - syslog(LOG_DEBUG, "Our checksum %hx", cksum); - - cksum = ipv6_cksum((short int *)opt, sizeof(*opt)/2, cksum); - - syslog(LOG_DEBUG, "Our checksum %hx", cksum); - - /* Create neighbor advertation reply */ - - 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(&hdr->ip6_dst, &hdr->ip6_src, 16); /* swap destination and source protocol address */ - memcpy(&hdr->ip6_src, &ns->nd_ns_target, 16); /* ... */ - - memcpy((char *)opt + sizeof(*opt), packet->data + ETHER_ADDR_LEN, 6); /* add fake source hard addr */ - - ns->nd_ns_hdr.icmp6_cksum = 0; - ns->nd_ns_hdr.icmp6_type = ND_NEIGHBOR_ADVERT; - opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; - - /* Create pseudo header */ - - memcpy(&pseudo.ip6_src, &hdr->ip6_src, 16); - memcpy(&pseudo.ip6_dst, &hdr->ip6_dst, 16); - pseudo.length = htonl(sizeof(struct icmp6_hdr)); - pseudo.junk[0] = pseudo.junk[1] = pseudo.junk[2] = 0; - pseudo.junk[3] = IPPROTO_ICMPV6; - - /* Generate checksum */ - - cksum = ipv6_cksum((short int *)&pseudo, sizeof(pseudo)/2, 0); - cksum = ipv6_cksum((short int *)ns, sizeof(*ns)/2, cksum); - - ns->nd_ns_hdr.icmp6_cksum = htons(cksum); - - write_packet(packet); -cp + + 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 */ + +static void route_neighborsol(vpn_packet_t *packet) +{ + struct ip6_hdr *hdr; + struct nd_neighbor_solicit *ns; + struct nd_opt_hdr *opt; + subnet_t *subnet; + uint16_t checksum; + + struct { + struct in6_addr ip6_src; /* source address */ + struct in6_addr ip6_dst; /* destination address */ + uint32_t length; + uint32_t next; + } pseudo; + + cp(); + + hdr = (struct ip6_hdr *)(packet->data + 14); + ns = (struct nd_neighbor_solicit *)(packet->data + 14 + sizeof(*hdr)); + opt = (struct nd_opt_hdr *)(packet->data + 14 + sizeof(*hdr) + sizeof(*ns)); + + /* First, snatch the source address from the neighbor solicitation packet */ + + if(overwrite_mac) + memcpy(mymac.x, packet->data + 6, 6); + + /* Check if this is a valid neighbor solicitation request */ + + if(ns->nd_ns_hdr.icmp6_type != ND_NEIGHBOR_SOLICIT || + opt->nd_opt_type != ND_OPT_SOURCE_LINKADDR) { + logger(DEBUG_TRAFFIC, LOG_WARNING, _("Cannot route packet: received unknown type neighbor solicitation request")); + return; + } + + /* Create pseudo header */ + + memcpy(&pseudo.ip6_src, &hdr->ip6_src, 16); + memcpy(&pseudo.ip6_dst, &hdr->ip6_dst, 16); + pseudo.length = htonl(sizeof(*ns) + sizeof(*opt) + 6); + pseudo.next = htonl(IPPROTO_ICMPV6); + + /* Generate checksum */ + + checksum = inet_checksum(&pseudo, sizeof(pseudo), ~0); + checksum = inet_checksum(ns, sizeof(*ns) + 8, checksum); + + if(checksum) { + logger(DEBUG_TRAFFIC, LOG_WARNING, _("Cannot route packet: checksum error for neighbor solicitation request")); + return; + } + + /* Check if the IPv6 address exists on the VPN */ + + subnet = lookup_subnet_ipv6((ipv6_t *) & ns->nd_ns_target); + + if(!subnet) { + logger(DEBUG_TRAFFIC, LOG_WARNING, _("Cannot route packet: neighbor solicitation request for unknown address %hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx"), + ntohs(((uint16_t *) & ns->nd_ns_target)[0]), + ntohs(((uint16_t *) & ns->nd_ns_target)[1]), + ntohs(((uint16_t *) & ns->nd_ns_target)[2]), + ntohs(((uint16_t *) & ns->nd_ns_target)[3]), + ntohs(((uint16_t *) & ns->nd_ns_target)[4]), + ntohs(((uint16_t *) & ns->nd_ns_target)[5]), + ntohs(((uint16_t *) & ns->nd_ns_target)[6]), + ntohs(((uint16_t *) & ns->nd_ns_target)[7])); + + return; + } + + /* Check if it is for our own subnet */ + + if(subnet->owner == myself) + return; /* silently ignore */ + + /* Create neighbor advertation reply */ + + 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(&hdr->ip6_dst, &hdr->ip6_src, 16); /* swap destination and source protocol address */ + memcpy(&hdr->ip6_src, &ns->nd_ns_target, 16); /* ... */ + + memcpy((char *) opt + sizeof(*opt), packet->data + ETHER_ADDR_LEN, 6); /* add fake source hard addr */ + + ns->nd_ns_hdr.icmp6_cksum = 0; + ns->nd_ns_hdr.icmp6_type = ND_NEIGHBOR_ADVERT; + ns->nd_ns_hdr.icmp6_dataun.icmp6_un_data8[0] = 0x40; /* Set solicited flag */ + ns->nd_ns_hdr.icmp6_dataun.icmp6_un_data8[1] = + ns->nd_ns_hdr.icmp6_dataun.icmp6_un_data8[2] = + ns->nd_ns_hdr.icmp6_dataun.icmp6_un_data8[3] = 0; + opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; + + /* Create pseudo header */ + + memcpy(&pseudo.ip6_src, &hdr->ip6_src, 16); + memcpy(&pseudo.ip6_dst, &hdr->ip6_dst, 16); + pseudo.length = htonl(sizeof(*ns) + sizeof(*opt) + 6); + pseudo.next = htonl(IPPROTO_ICMPV6); + + /* Generate checksum */ + + checksum = inet_checksum(&pseudo, sizeof(pseudo), ~0); + checksum = inet_checksum(ns, sizeof(*ns) + 8, checksum); + + ns->nd_ns_hdr.icmp6_cksum = checksum; + + write_packet(packet); } + #endif -void route_arp(vpn_packet_t *packet) +/* RFC 826 */ + +static void route_arp(vpn_packet_t *packet) { - struct ether_arp *arp; - subnet_t *subnet; - unsigned char ipbuf[4]; -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 IPv4 address exists on the VPN */ - - subnet = lookup_subnet_ipv4((ipv4_t *)arp->arp_tpa); - - 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); - - write_packet(packet); -cp + struct ether_arp *arp; + subnet_t *subnet; + uint8_t ipbuf[4]; + + cp(); + + /* First, snatch the source address from the ARP packet */ + + 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). + 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 || + arp->arp_hln != ETHER_ADDR_LEN || arp->arp_pln != 4 || ntohs(arp->arp_op) != ARPOP_REQUEST) { + logger(DEBUG_TRAFFIC, LOG_WARNING, _("Cannot route packet: received unknown type ARP request")); + return; + } + + /* Check if the IPv4 address exists on the VPN */ + + subnet = lookup_subnet_ipv4((ipv4_t *) arp->arp_tpa); + + if(!subnet) { + logger(DEBUG_TRAFFIC, 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); } void route_outgoing(vpn_packet_t *packet) { - unsigned short int type; - node_t *n = NULL; -cp - /* FIXME: multicast? */ - - switch(routing_mode) - { - case RMODE_ROUTER: - type = ntohs(*((unsigned short*)(&packet->data[12]))); - switch(type) - { - case 0x0800: - n = route_ipv4(packet); - break; - case 0x86DD: - n = route_ipv6(packet); -#ifdef NEIGHBORSOL - if(!n && packet->data[0] == 0x33 && packet->data[1] == 0x33 && packet->data[2] == 0xff) - { - route_neighborsol(packet); - return; - } + uint16_t type; + node_t *n = NULL; + + cp(); + + /* FIXME: multicast? */ + + switch (routing_mode) { + case RMODE_ROUTER: + type = ntohs(*((uint16_t *)(&packet->data[12]))); + switch (type) { + case 0x0800: + n = route_ipv4(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 - 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(n) - send_packet(n, packet); - break; - - case RMODE_SWITCH: - n = route_mac(packet); - if(n) - send_packet(n, packet); - else - broadcast_packet(myself, packet); - break; - - case RMODE_HUB: - broadcast_packet(myself, packet); - break; - } + n = route_ipv6(packet); + break; + + case 0x0806: + route_arp(packet); + return; + + default: + logger(DEBUG_TRAFFIC, LOG_WARNING, _("Cannot route packet: unknown type %hx"), type); + return; + } + if(n) + send_packet(n, packet); + break; + + case RMODE_SWITCH: + n = route_mac(packet); + if(n) + send_packet(n, packet); + else + broadcast_packet(myself, packet); + break; + + case RMODE_HUB: + broadcast_packet(myself, packet); + break; + } } void route_incoming(node_t *source, vpn_packet_t *packet) { - switch(routing_mode) - { - case RMODE_ROUTER: - { - node_t *n = NULL; - unsigned short int type; - - type = ntohs(*((unsigned short*)(&packet->data[12]))); - switch(type) - { - case 0x0800: - n = route_ipv4(packet); - break; - case 0x86DD: - n = route_ipv6(packet); - break; - default: - n = myself; - break; - } - - if(n) - { - if(n == myself) - { - memcpy(packet->data, mymac.net.mac.address.x, 6); - write_packet(packet); - } - else - send_packet(n, packet); - } - } - break; - case RMODE_SWITCH: - { - 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; - } + switch (routing_mode) { + case RMODE_ROUTER: + { + node_t *n = NULL; + uint16_t type; + + type = ntohs(*((uint16_t *)(&packet->data[12]))); + switch (type) { + case 0x0800: + n = route_ipv4(packet); + break; + + case 0x86DD: + n = route_ipv6(packet); + break; + + default: + n = myself; + break; + } + + if(n) { + if(n == myself) { + if(overwrite_mac) + memcpy(packet->data, mymac.x, 6); + write_packet(packet); + } else + send_packet(n, packet); + } + } + break; + + case RMODE_SWITCH: + { + 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; + } }