X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Froute.c;h=0c9f2aa11e0f0a6ca5e1624c1645b5bed9b5fd33;hp=1535b18ec223ffc1ef3c66253f8c00df08ceff8d;hb=994adadf2752fd7515ee30ed5fdb91178a615fe9;hpb=de78d79db84c486afcc353884ec1770866beb653 diff --git a/src/route.c b/src/route.c index 1535b18e..0c9f2aa1 100644 --- a/src/route.c +++ b/src/route.c @@ -1,7 +1,7 @@ /* route.c -- routing Copyright (C) 2000-2005 Ivo Timmermans, - 2000-2006 Guus Sliepen + 2000-2013 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 @@ -13,21 +13,20 @@ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - - $Id$ + You should have received a copy of the GNU General Public License along + with this program; if not, write to the Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include "system.h" -#include "avl_tree.h" #include "connection.h" +#include "control_common.h" #include "ethernet.h" #include "ipv4.h" #include "ipv6.h" #include "logger.h" +#include "meta.h" #include "net.h" #include "protocol.h" #include "route.h" @@ -35,10 +34,15 @@ #include "utils.h" rmode_t routing_mode = RMODE_ROUTER; +fmode_t forwarding_mode = FMODE_INTERNAL; +bmode_t broadcast_mode = BMODE_MST; +bool decrement_ttl = false; +bool directonly = false; bool priorityinheritance = false; int macexpire = 600; bool overwrite_mac = false; mac_t mymac = {{0xFE, 0xFD, 0, 0, 0, 0}}; +bool pcap = false; /* Sizes of various headers */ @@ -51,10 +55,15 @@ static const size_t icmp6_size = sizeof(struct icmp6_hdr); static const size_t ns_size = sizeof(struct nd_neighbor_solicit); static const size_t opt_size = sizeof(struct nd_opt_hdr); +#ifndef MAX +#define MAX(a, b) ((a) > (b) ? (a) : (b)) +#endif + +static timeout_t age_subnets_timeout; + /* RFC 1071 */ -static uint16_t inet_checksum(void *data, int len, uint16_t prevsum) -{ +static uint16_t inet_checksum(void *data, int len, uint16_t prevsum) { uint16_t *p = data; uint32_t checksum = prevsum ^ 0xFFFF; @@ -62,7 +71,7 @@ static uint16_t inet_checksum(void *data, int len, uint16_t prevsum) checksum += *p++; len -= 2; } - + if(len) checksum += *(uint8_t *)p; @@ -75,144 +84,81 @@ static uint16_t inet_checksum(void *data, int len, uint16_t prevsum) static bool ratelimit(int frequency) { static time_t lasttime = 0; static int count = 0; - - if(lasttime == now) { - if(++count > frequency) + + if(lasttime == now.tv_sec) { + if(count >= frequency) return true; } else { - lasttime = now; + lasttime = now.tv_sec; count = 0; } + count++; return false; } static bool checklength(node_t *source, vpn_packet_t *packet, length_t length) { if(packet->len < length) { - ifdebug(TRAFFIC) logger(LOG_WARNING, _("Got too short packet from %s (%s)"), source->name, source->hostname); + logger(DEBUG_TRAFFIC, LOG_WARNING, "Got too short packet from %s (%s)", source->name, source->hostname); return false; } else return true; } - -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) { - ifdebug(TRAFFIC) logger(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; - subnet->expires = now + macexpire; - subnet->net.mac.address = *address; - subnet_add(myself, subnet); - - /* And tell all other tinc daemons it's our MAC */ - - for(node = connection_tree->head; node; node = node->next) { - c = node->data; - if(c->status.active) - send_add_subnet(c, subnet); - } - } - - if(subnet->expires) - subnet->expires = now + macexpire; -} - -void age_subnets(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 = node->data; - if(s->expires && s->expires < now) { - ifdebug(TRAFFIC) { - char netstr[MAXNETSTR]; - if(net2str(netstr, sizeof netstr, s)) - logger(LOG_INFO, _("Subnet %s expired"), netstr); - } - - for(node2 = connection_tree->head; node2; node2 = node2->next) { - c = node2->data; - if(c->status.active) - send_del_subnet(c, s); - } - - subnet_del(myself, s); - } - } -} - -static void route_mac(node_t *source, vpn_packet_t *packet) -{ - subnet_t *subnet; - - cp(); - - /* Learn source address */ - - if(source == myself) - learn_mac((mac_t *)(&packet->data[6])); - - /* Lookup destination address */ - - subnet = lookup_subnet_mac((mac_t *)(&packet->data[0])); - - if(!subnet) { - broadcast_packet(source, packet); - return; - } - - if(subnet->owner == source) { - ifdebug(TRAFFIC) logger(LOG_WARNING, _("Packet looping back to %s (%s)!"), source->name, source->hostname); - return; - } - - send_packet(subnet->owner, packet); +static void swap_mac_addresses(vpn_packet_t *packet) { + mac_t tmp; + memcpy(&tmp, &DATA(packet)[0], sizeof tmp); + memcpy(&DATA(packet)[0], &DATA(packet)[6], sizeof tmp); + memcpy(&DATA(packet)[6], &tmp, sizeof tmp); } /* RFC 792 */ -static void route_ipv4_unreachable(node_t *source, vpn_packet_t *packet, uint8_t type, uint8_t code) -{ +static void route_ipv4_unreachable(node_t *source, vpn_packet_t *packet, length_t ether_size, uint8_t type, uint8_t code) { struct ip ip = {0}; struct icmp icmp = {0}; - + struct in_addr ip_src; struct in_addr ip_dst; uint32_t oldlen; if(ratelimit(3)) return; - - cp(); + + /* Swap Ethernet source and destination addresses */ + + swap_mac_addresses(packet); /* Copy headers from packet into properly aligned structs on the stack */ - memcpy(&ip, packet->data + ether_size, ip_size); + memcpy(&ip, DATA(packet) + ether_size, ip_size); /* Remember original source and destination */ - + ip_src = ip.ip_src; ip_dst = ip.ip_dst; + /* Try to reply with an IP address assigned to the local machine */ + + if (type == ICMP_TIME_EXCEEDED && code == ICMP_EXC_TTL) { + int sockfd = socket(AF_INET, SOCK_DGRAM, 0); + if (sockfd != -1) { + struct sockaddr_in addr; + memset(&addr, 0, sizeof(addr)); + addr.sin_family = AF_INET; + addr.sin_addr = ip.ip_src; + if (!connect(sockfd, (const struct sockaddr*) &addr, sizeof(addr))) { + memset(&addr, 0, sizeof(addr)); + addr.sin_family = AF_INET; + socklen_t addrlen = sizeof(addr); + if (!getsockname(sockfd, (struct sockaddr*) &addr, &addrlen) && addrlen <= sizeof(addr)) { + ip_dst = addr.sin_addr; + } + } + close(sockfd); + } + } + oldlen = packet->len - ether_size; if(type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) @@ -220,13 +166,13 @@ static void route_ipv4_unreachable(node_t *source, vpn_packet_t *packet, uint8_t if(oldlen >= IP_MSS - ip_size - icmp_size) oldlen = IP_MSS - ip_size - icmp_size; - + /* Copy first part of original contents to ICMP message */ - - memmove(packet->data + ether_size + ip_size + icmp_size, packet->data + ether_size, oldlen); + + memmove(DATA(packet) + ether_size + ip_size + icmp_size, DATA(packet) + ether_size, oldlen); /* Fill in IPv4 header */ - + ip.ip_v = 4; ip.ip_hl = ip_size / 4; ip.ip_tos = 0; @@ -240,61 +186,359 @@ static void route_ipv4_unreachable(node_t *source, vpn_packet_t *packet, uint8_t ip.ip_dst = ip_src; ip.ip_sum = inet_checksum(&ip, ip_size, ~0); - + /* Fill in ICMP header */ - + icmp.icmp_type = type; icmp.icmp_code = code; icmp.icmp_cksum = 0; - + icmp.icmp_cksum = inet_checksum(&icmp, icmp_size, ~0); - icmp.icmp_cksum = inet_checksum(packet->data + ether_size + ip_size + icmp_size, oldlen, icmp.icmp_cksum); + icmp.icmp_cksum = inet_checksum(DATA(packet) + ether_size + ip_size + icmp_size, oldlen, icmp.icmp_cksum); /* Copy structs on stack back to packet */ - memcpy(packet->data + ether_size, &ip, ip_size); - memcpy(packet->data + ether_size + ip_size, &icmp, icmp_size); - + memcpy(DATA(packet) + ether_size, &ip, ip_size); + memcpy(DATA(packet) + ether_size + ip_size, &icmp, icmp_size); + packet->len = ether_size + ip_size + icmp_size + oldlen; send_packet(source, packet); } +/* RFC 2463 */ + +static void route_ipv6_unreachable(node_t *source, vpn_packet_t *packet, length_t ether_size, uint8_t type, uint8_t code) { + struct ip6_hdr ip6; + struct icmp6_hdr icmp6 = {0}; + 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(3)) + return; + + /* Swap Ethernet source and destination addresses */ + + swap_mac_addresses(packet); + + /* Copy headers from packet to structs on the stack */ + + memcpy(&ip6, DATA(packet) + ether_size, ip6_size); + + /* Remember original source and destination */ + + pseudo.ip6_src = ip6.ip6_dst; + pseudo.ip6_dst = ip6.ip6_src; + + /* Try to reply with an IP address assigned to the local machine */ + + if (type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT) { + int sockfd = socket(AF_INET6, SOCK_DGRAM, 0); + if (sockfd != -1) { + struct sockaddr_in6 addr; + memset(&addr, 0, sizeof(addr)); + addr.sin6_family = AF_INET6; + addr.sin6_addr = ip6.ip6_src; + if (!connect(sockfd, (const struct sockaddr*) &addr, sizeof(addr))) { + memset(&addr, 0, sizeof(addr)); + addr.sin6_family = AF_INET6; + socklen_t addrlen = sizeof(addr); + if (!getsockname(sockfd, (struct sockaddr*) &addr, &addrlen) && addrlen <= sizeof(addr)) { + pseudo.ip6_src = addr.sin6_addr; + } + } + close(sockfd); + } + } + + pseudo.length = packet->len - ether_size; + + if(type == ICMP6_PACKET_TOO_BIG) + icmp6.icmp6_mtu = htonl(pseudo.length); + + if(pseudo.length >= IP_MSS - ip6_size - icmp6_size) + pseudo.length = IP_MSS - ip6_size - icmp6_size; + + /* Copy first part of original contents to ICMP message */ + + memmove(DATA(packet) + ether_size + ip6_size + icmp6_size, DATA(packet) + ether_size, pseudo.length); + + /* Fill in IPv6 header */ + + ip6.ip6_flow = htonl(0x60000000UL); + ip6.ip6_plen = htons(icmp6_size + pseudo.length); + ip6.ip6_nxt = IPPROTO_ICMPV6; + ip6.ip6_hlim = 255; + ip6.ip6_src = pseudo.ip6_src; + ip6.ip6_dst = pseudo.ip6_dst; + + /* Fill in ICMP header */ + + icmp6.icmp6_type = type; + icmp6.icmp6_code = code; + icmp6.icmp6_cksum = 0; + + /* Create pseudo header */ + + pseudo.length = htonl(icmp6_size + pseudo.length); + pseudo.next = htonl(IPPROTO_ICMPV6); + + /* Generate checksum */ + + checksum = inet_checksum(&pseudo, sizeof pseudo, ~0); + checksum = inet_checksum(&icmp6, icmp6_size, checksum); + checksum = inet_checksum(DATA(packet) + ether_size + ip6_size + icmp6_size, ntohl(pseudo.length) - icmp6_size, checksum); + + icmp6.icmp6_cksum = checksum; + + /* Copy structs on stack back to packet */ + + memcpy(DATA(packet) + ether_size, &ip6, ip6_size); + memcpy(DATA(packet) + ether_size + ip6_size, &icmp6, icmp6_size); + + packet->len = ether_size + ip6_size + ntohl(pseudo.length); + + send_packet(source, packet); +} + +static bool do_decrement_ttl(node_t *source, vpn_packet_t *packet) { + uint16_t type = DATA(packet)[12] << 8 | DATA(packet)[13]; + length_t ethlen = ether_size; + + if(type == ETH_P_8021Q) { + type = DATA(packet)[16] << 8 | DATA(packet)[17]; + ethlen += 4; + } + + switch (type) { + case ETH_P_IP: + if(!checklength(source, packet, ethlen + ip_size)) + return false; + + if(DATA(packet)[ethlen + 8] <= 1) { + if(DATA(packet)[ethlen + 11] != IPPROTO_ICMP || DATA(packet)[ethlen + 32] != ICMP_TIME_EXCEEDED) + route_ipv4_unreachable(source, packet, ethlen, ICMP_TIME_EXCEEDED, ICMP_EXC_TTL); + return false; + } + + uint16_t old = DATA(packet)[ethlen + 8] << 8 | DATA(packet)[ethlen + 9]; + DATA(packet)[ethlen + 8]--; + uint16_t new = DATA(packet)[ethlen + 8] << 8 | DATA(packet)[ethlen + 9]; + + uint32_t checksum = DATA(packet)[ethlen + 10] << 8 | DATA(packet)[ethlen + 11]; + checksum += old + (~new & 0xFFFF); + while(checksum >> 16) + checksum = (checksum & 0xFFFF) + (checksum >> 16); + DATA(packet)[ethlen + 10] = checksum >> 8; + DATA(packet)[ethlen + 11] = checksum & 0xff; + + return true; + + case ETH_P_IPV6: + if(!checklength(source, packet, ethlen + ip6_size)) + return false; + + if(DATA(packet)[ethlen + 7] <= 1) { + if(DATA(packet)[ethlen + 6] != IPPROTO_ICMPV6 || DATA(packet)[ethlen + 40] != ICMP6_TIME_EXCEEDED) + route_ipv6_unreachable(source, packet, ethlen, ICMP6_TIME_EXCEEDED, ICMP6_TIME_EXCEED_TRANSIT); + return false; + } + + DATA(packet)[ethlen + 7]--; + + return true; + + default: + return true; + } +} + +static void clamp_mss(const node_t *source, const node_t *via, vpn_packet_t *packet) { + if(!source || !via || !(via->options & OPTION_CLAMP_MSS)) + return; + + uint16_t mtu = source->mtu; + if(via != myself && via->mtu < mtu) + mtu = via->mtu; + + /* Find TCP header */ + int start = ether_size; + uint16_t type = DATA(packet)[12] << 8 | DATA(packet)[13]; + + if(type == ETH_P_8021Q) { + start += 4; + type = DATA(packet)[16] << 8 | DATA(packet)[17]; + } + + if(type == ETH_P_IP && DATA(packet)[start + 9] == 6) + start += (DATA(packet)[start] & 0xf) * 4; + else if(type == ETH_P_IPV6 && DATA(packet)[start + 6] == 6) + start += 40; + else + return; + + if(packet->len <= start + 20) + return; + + /* Use data offset field to calculate length of options field */ + int len = ((DATA(packet)[start + 12] >> 4) - 5) * 4; + + if(packet->len < start + 20 + len) + return; + + /* Search for MSS option header */ + for(int i = 0; i < len;) { + if(DATA(packet)[start + 20 + i] == 0) + break; + + if(DATA(packet)[start + 20 + i] == 1) { + i++; + continue; + } + + if(i > len - 2 || i > len - DATA(packet)[start + 21 + i]) + break; + + if(DATA(packet)[start + 20 + i] != 2) { + if(DATA(packet)[start + 21 + i] < 2) + break; + i += DATA(packet)[start + 21 + i]; + continue; + } + + if(DATA(packet)[start + 21] != 4) + break; + + /* Found it */ + uint16_t oldmss = DATA(packet)[start + 22 + i] << 8 | DATA(packet)[start + 23 + i]; + uint16_t newmss = mtu - start - 20; + uint32_t csum = DATA(packet)[start + 16] << 8 | DATA(packet)[start + 17]; + + if(oldmss <= newmss) + break; + + logger(DEBUG_TRAFFIC, LOG_INFO, "Clamping MSS of packet from %s to %s to %d", source->name, via->name, newmss); + + /* Update the MSS value and the checksum */ + DATA(packet)[start + 22 + i] = newmss >> 8; + DATA(packet)[start + 23 + i] = newmss & 0xff; + csum ^= 0xffff; + csum += oldmss ^ 0xffff; + csum += newmss; + csum = (csum & 0xffff) + (csum >> 16); + csum += csum >> 16; + csum ^= 0xffff; + DATA(packet)[start + 16] = csum >> 8; + DATA(packet)[start + 17] = csum; + break; + } +} + +static void age_subnets(void *data) { + bool left = false; + + for splay_each(subnet_t, s, myself->subnet_tree) { + if(s->expires && s->expires < now.tv_sec) { + if(debug_level >= DEBUG_TRAFFIC) { + char netstr[MAXNETSTR]; + if(net2str(netstr, sizeof netstr, s)) + logger(DEBUG_TRAFFIC, LOG_INFO, "Subnet %s expired", netstr); + } + + for list_each(connection_t, c, connection_list) + if(c->edge) + send_del_subnet(c, s); + + subnet_del(myself, s); + } else { + if(s->expires) + left = true; + } + } + + if(left) + timeout_set(&age_subnets_timeout, &(struct timeval){10, rand() % 100000}); +} + +static void learn_mac(mac_t *address) { + subnet_t *subnet = lookup_subnet_mac(myself, address); + + /* If we don't know this MAC address yet, store it */ + + if(!subnet) { + logger(DEBUG_TRAFFIC, LOG_INFO, "Learned new MAC address %x:%x:%x:%x:%x:%x", + 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->expires = now.tv_sec + macexpire; + subnet->net.mac.address = *address; + subnet->weight = 10; + subnet_add(myself, subnet); + subnet_update(myself, subnet, true); + + /* And tell all other tinc daemons it's our MAC */ + + for list_each(connection_t, c, connection_list) + if(c->edge) + send_add_subnet(c, subnet); + + timeout_add(&age_subnets_timeout, age_subnets, NULL, &(struct timeval){10, rand() % 100000}); + } else { + if(subnet->expires) + subnet->expires = now.tv_sec + macexpire; + } +} + +static void route_broadcast(node_t *source, vpn_packet_t *packet) { + if(decrement_ttl && source != myself) + if(!do_decrement_ttl(source, packet)) + return; + + broadcast_packet(source, packet); +} + /* RFC 791 */ -static void fragment_ipv4_packet(node_t *dest, vpn_packet_t *packet) { +static void fragment_ipv4_packet(node_t *dest, vpn_packet_t *packet, length_t ether_size) { struct ip ip; vpn_packet_t fragment; int len, maxlen, todo; uint8_t *offset; uint16_t ip_off, origf; - - cp(); - memcpy(&ip, packet->data + ether_size, ip_size); + memcpy(&ip, DATA(packet) + ether_size, ip_size); fragment.priority = packet->priority; + fragment.offset = DEFAULT_PACKET_OFFSET; if(ip.ip_hl != ip_size / 4) return; - + todo = ntohs(ip.ip_len) - ip_size; if(ether_size + ip_size + todo != packet->len) { - ifdebug(TRAFFIC) logger(LOG_WARNING, _("Length of packet (%d) doesn't match length in IPv4 header (%d)"), packet->len, ether_size + ip_size + todo); + logger(DEBUG_TRAFFIC, LOG_WARNING, "Length of packet (%d) doesn't match length in IPv4 header (%d)", packet->len, (int)(ether_size + ip_size + todo)); return; } - ifdebug(TRAFFIC) logger(LOG_INFO, _("Fragmenting packet of %d bytes to %s (%s)"), packet->len, dest->name, dest->hostname); + logger(DEBUG_TRAFFIC, LOG_INFO, "Fragmenting packet of %d bytes to %s (%s)", packet->len, dest->name, dest->hostname); - offset = packet->data + ether_size + ip_size; + offset = DATA(packet) + ether_size + ip_size; maxlen = (dest->mtu - ether_size - ip_size) & ~0x7; ip_off = ntohs(ip.ip_off); origf = ip_off & ~IP_OFFMASK; ip_off &= IP_OFFMASK; - + while(todo) { len = todo > maxlen ? maxlen : todo; - memcpy(fragment.data + ether_size + ip_size, offset, len); + memcpy(DATA(&fragment) + ether_size + ip_size, offset, len); todo -= len; offset += len; @@ -302,242 +546,209 @@ static void fragment_ipv4_packet(node_t *dest, vpn_packet_t *packet) { ip.ip_off = htons(ip_off | origf | (todo ? IP_MF : 0)); ip.ip_sum = 0; ip.ip_sum = inet_checksum(&ip, ip_size, ~0); - memcpy(fragment.data, packet->data, ether_size); - memcpy(fragment.data + ether_size, &ip, ip_size); + memcpy(DATA(&fragment), DATA(packet), ether_size); + memcpy(DATA(&fragment) + ether_size, &ip, ip_size); fragment.len = ether_size + ip_size + len; send_packet(dest, &fragment); ip_off += len / 8; - } + } } -static void route_ipv4_unicast(node_t *source, vpn_packet_t *packet) -{ +static void route_ipv4(node_t *source, vpn_packet_t *packet) { + if(!checklength(source, packet, ether_size + ip_size)) + return; + subnet_t *subnet; node_t *via; + ipv4_t dest; - cp(); - - subnet = lookup_subnet_ipv4((ipv4_t *) &packet->data[30]); + memcpy(&dest, &DATA(packet)[30], sizeof dest); + subnet = lookup_subnet_ipv4(&dest); if(!subnet) { - ifdebug(TRAFFIC) logger(LOG_WARNING, _("Cannot route packet from %s (%s): unknown IPv4 destination address %d.%d.%d.%d"), + logger(DEBUG_TRAFFIC, LOG_WARNING, "Cannot route packet from %s (%s): unknown IPv4 destination address %d.%d.%d.%d", source->name, source->hostname, - packet->data[30], - packet->data[31], - packet->data[32], - packet->data[33]); + dest.x[0], + dest.x[1], + dest.x[2], + dest.x[3]); + + route_ipv4_unreachable(source, packet, ether_size, ICMP_DEST_UNREACH, ICMP_NET_UNKNOWN); + return; + } - route_ipv4_unreachable(source, packet, ICMP_DEST_UNREACH, ICMP_NET_UNKNOWN); + if (!subnet->owner) { + route_broadcast(source, packet); return; } - + if(subnet->owner == source) { - ifdebug(TRAFFIC) logger(LOG_WARNING, _("Packet looping back to %s (%s)!"), source->name, source->hostname); + logger(DEBUG_TRAFFIC, LOG_WARNING, "Packet looping back to %s (%s)!", source->name, source->hostname); return; } if(!subnet->owner->status.reachable) - route_ipv4_unreachable(source, packet, ICMP_DEST_UNREACH, ICMP_NET_UNREACH); + return route_ipv4_unreachable(source, packet, ether_size, ICMP_DEST_UNREACH, ICMP_NET_UNREACH); + + if(forwarding_mode == FMODE_OFF && source != myself && subnet->owner != myself) + return route_ipv4_unreachable(source, packet, ether_size, ICMP_DEST_UNREACH, ICMP_NET_ANO); + + if(decrement_ttl && source != myself && subnet->owner != myself) + if(!do_decrement_ttl(source, packet)) + return; if(priorityinheritance) - packet->priority = packet->data[15]; + packet->priority = DATA(packet)[15]; via = (subnet->owner->via == myself) ? subnet->owner->nexthop : subnet->owner->via; - - if(via && packet->len > via->mtu && via != myself) { - ifdebug(TRAFFIC) logger(LOG_INFO, _("Packet for %s (%s) length %d larger than MTU %d"), subnet->owner->name, subnet->owner->hostname, packet->len, via->mtu); - if(packet->data[20] & 0x40) { - packet->len = via->mtu; - route_ipv4_unreachable(source, packet, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED); - } else { - fragment_ipv4_packet(via, packet); - } + if(via == source) { + logger(DEBUG_TRAFFIC, LOG_ERR, "Routing loop for packet from %s (%s)!", source->name, source->hostname); return; } - send_packet(subnet->owner, packet); -} + if(directonly && subnet->owner != via) + return route_ipv4_unreachable(source, packet, ether_size, ICMP_DEST_UNREACH, ICMP_NET_ANO); -static void route_ipv4(node_t *source, vpn_packet_t *packet) -{ - cp(); + if(via && packet->len > MAX(via->mtu, 590) && via != myself) { + logger(DEBUG_TRAFFIC, LOG_INFO, "Packet for %s (%s) length %d larger than MTU %d", subnet->owner->name, subnet->owner->hostname, packet->len, via->mtu); + if(DATA(packet)[20] & 0x40) { + packet->len = MAX(via->mtu, 590); + route_ipv4_unreachable(source, packet, ether_size, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED); + } else { + fragment_ipv4_packet(via, packet, ether_size); + } - if(!checklength(source, packet, ether_size + ip_size)) return; + } - route_ipv4_unicast(source, packet); -} + clamp_mss(source, via, packet); -/* RFC 2463 */ - -static void route_ipv6_unreachable(node_t *source, vpn_packet_t *packet, uint8_t type, uint8_t code) -{ - struct ip6_hdr ip6; - struct icmp6_hdr icmp6 = {0}; - uint16_t checksum; + send_packet(subnet->owner, packet); +} - struct { - struct in6_addr ip6_src; /* source address */ - struct in6_addr ip6_dst; /* destination address */ - uint32_t length; - uint32_t next; - } pseudo; +static void route_neighborsol(node_t *source, vpn_packet_t *packet); - if(ratelimit(3)) +static void route_ipv6(node_t *source, vpn_packet_t *packet) { + if(!checklength(source, packet, ether_size + ip6_size)) return; - - cp(); - /* Copy headers from packet to structs on the stack */ - - memcpy(&ip6, packet->data + ether_size, ip6_size); - - /* Remember original source and destination */ - - pseudo.ip6_src = ip6.ip6_dst; - pseudo.ip6_dst = ip6.ip6_src; - - pseudo.length = packet->len - ether_size; - - if(type == ICMP6_PACKET_TOO_BIG) - icmp6.icmp6_mtu = htonl(pseudo.length); - - if(pseudo.length >= IP_MSS - ip6_size - icmp6_size) - pseudo.length = IP_MSS - ip6_size - icmp6_size; - - /* Copy first part of original contents to ICMP message */ - - memmove(packet->data + ether_size + ip6_size + icmp6_size, packet->data + ether_size, pseudo.length); - - /* Fill in IPv6 header */ - - ip6.ip6_flow = htonl(0x60000000UL); - ip6.ip6_plen = htons(icmp6_size + pseudo.length); - ip6.ip6_nxt = IPPROTO_ICMPV6; - ip6.ip6_hlim = 255; - ip6.ip6_src = pseudo.ip6_src; - ip6.ip6_dst = pseudo.ip6_dst; - - /* Fill in ICMP header */ - - icmp6.icmp6_type = type; - icmp6.icmp6_code = code; - icmp6.icmp6_cksum = 0; - - /* Create pseudo header */ - - pseudo.length = htonl(icmp6_size + pseudo.length); - pseudo.next = htonl(IPPROTO_ICMPV6); - - /* Generate checksum */ - - checksum = inet_checksum(&pseudo, sizeof(pseudo), ~0); - checksum = inet_checksum(&icmp6, icmp6_size, checksum); - checksum = inet_checksum(packet->data + ether_size + ip6_size + icmp6_size, ntohl(pseudo.length) - icmp6_size, checksum); - - icmp6.icmp6_cksum = checksum; - - /* Copy structs on stack back to packet */ - - memcpy(packet->data + ether_size, &ip6, ip6_size); - memcpy(packet->data + ether_size + ip6_size, &icmp6, icmp6_size); - - packet->len = ether_size + ip6_size + ntohl(pseudo.length); - - send_packet(source, packet); -} + if(DATA(packet)[20] == IPPROTO_ICMPV6 && checklength(source, packet, ether_size + ip6_size + icmp6_size) && DATA(packet)[54] == ND_NEIGHBOR_SOLICIT) { + route_neighborsol(source, packet); + return; + } -static void route_ipv6_unicast(node_t *source, vpn_packet_t *packet) -{ subnet_t *subnet; node_t *via; + ipv6_t dest; - cp(); - - subnet = lookup_subnet_ipv6((ipv6_t *) &packet->data[38]); + memcpy(&dest, &DATA(packet)[38], sizeof dest); + subnet = lookup_subnet_ipv6(&dest); if(!subnet) { - ifdebug(TRAFFIC) logger(LOG_WARNING, _("Cannot route packet from %s (%s): unknown IPv6 destination address %hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx"), + logger(DEBUG_TRAFFIC, LOG_WARNING, "Cannot route packet from %s (%s): unknown IPv6 destination address %hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx", source->name, source->hostname, - 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])); + ntohs(dest.x[0]), + ntohs(dest.x[1]), + ntohs(dest.x[2]), + ntohs(dest.x[3]), + ntohs(dest.x[4]), + ntohs(dest.x[5]), + ntohs(dest.x[6]), + ntohs(dest.x[7])); + + route_ipv6_unreachable(source, packet, ether_size, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_ADDR); + return; + } - route_ipv6_unreachable(source, packet, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_ADDR); + if (!subnet->owner) { + route_broadcast(source, packet); return; } if(subnet->owner == source) { - ifdebug(TRAFFIC) logger(LOG_WARNING, _("Packet looping back to %s (%s)!"), source->name, source->hostname); + logger(DEBUG_TRAFFIC, LOG_WARNING, "Packet looping back to %s (%s)!", source->name, source->hostname); return; } if(!subnet->owner->status.reachable) - route_ipv6_unreachable(source, packet, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOROUTE); + return route_ipv6_unreachable(source, packet, ether_size, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOROUTE); + + if(forwarding_mode == FMODE_OFF && source != myself && subnet->owner != myself) + return route_ipv6_unreachable(source, packet, ether_size, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_ADMIN); + + if(decrement_ttl && source != myself && subnet->owner != myself) + if(!do_decrement_ttl(source, packet)) + return; via = (subnet->owner->via == myself) ? subnet->owner->nexthop : subnet->owner->via; - - if(via && packet->len > via->mtu && via != myself) { - ifdebug(TRAFFIC) logger(LOG_INFO, _("Packet for %s (%s) length %d larger than MTU %d"), subnet->owner->name, subnet->owner->hostname, packet->len, via->mtu); - packet->len = via->mtu; - route_ipv6_unreachable(source, packet, ICMP6_PACKET_TOO_BIG, 0); + + if(via == source) { + logger(DEBUG_TRAFFIC, LOG_ERR, "Routing loop for packet from %s (%s)!", source->name, source->hostname); + return; + } + + if(directonly && subnet->owner != via) + return route_ipv6_unreachable(source, packet, ether_size, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_ADMIN); + + if(via && packet->len > MAX(via->mtu, 1294) && via != myself) { + logger(DEBUG_TRAFFIC, LOG_INFO, "Packet for %s (%s) length %d larger than MTU %d", subnet->owner->name, subnet->owner->hostname, packet->len, via->mtu); + packet->len = MAX(via->mtu, 1294); + route_ipv6_unreachable(source, packet, ether_size, ICMP6_PACKET_TOO_BIG, 0); return; } + clamp_mss(source, via, packet); + send_packet(subnet->owner, packet); } /* RFC 2461 */ -static void route_neighborsol(node_t *source, vpn_packet_t *packet) -{ +static void route_neighborsol(node_t *source, vpn_packet_t *packet) { struct ip6_hdr ip6; struct nd_neighbor_solicit ns; struct nd_opt_hdr opt; subnet_t *subnet; uint16_t checksum; + bool has_opt; struct { - struct in6_addr ip6_src; /* source address */ - struct in6_addr ip6_dst; /* destination address */ + struct in6_addr ip6_src; + struct in6_addr ip6_dst; uint32_t length; uint32_t next; } pseudo; - cp(); - - if(!checklength(source, packet, ether_size + ip6_size + ns_size + opt_size + ETH_ALEN)) + if(!checklength(source, packet, ether_size + ip6_size + ns_size)) return; - + + has_opt = packet->len >= ether_size + ip6_size + ns_size + opt_size + ETH_ALEN; + if(source != myself) { - ifdebug(TRAFFIC) logger(LOG_WARNING, _("Got neighbor solicitation request from %s (%s) while in router mode!"), source->name, source->hostname); + logger(DEBUG_TRAFFIC, LOG_WARNING, "Got neighbor solicitation request from %s (%s) while in router mode!", source->name, source->hostname); return; } /* Copy headers from packet to structs on the stack */ - memcpy(&ip6, packet->data + ether_size, ip6_size); - memcpy(&ns, packet->data + ether_size + ip6_size, ns_size); - memcpy(&opt, packet->data + ether_size + ip6_size + ns_size, opt_size); + memcpy(&ip6, DATA(packet) + ether_size, ip6_size); + memcpy(&ns, DATA(packet) + ether_size + ip6_size, ns_size); + if(has_opt) + memcpy(&opt, DATA(packet) + ether_size + ip6_size + ns_size, opt_size); /* First, snatch the source address from the neighbor solicitation packet */ if(overwrite_mac) - memcpy(mymac.x, packet->data + ETH_ALEN, ETH_ALEN); + memcpy(mymac.x, DATA(packet) + ETH_ALEN, ETH_ALEN); /* 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) { - ifdebug(TRAFFIC) logger(LOG_WARNING, _("Cannot route packet: received unknown type neighbor solicitation request")); + (has_opt && opt.nd_opt_type != ND_OPT_SOURCE_LINKADDR)) { + logger(DEBUG_TRAFFIC, LOG_WARNING, "Cannot route packet: received unknown type neighbor solicitation request"); return; } @@ -545,18 +756,23 @@ static void route_neighborsol(node_t *source, vpn_packet_t *packet) pseudo.ip6_src = ip6.ip6_src; pseudo.ip6_dst = ip6.ip6_dst; - pseudo.length = htonl(ns_size + opt_size + ETH_ALEN); + if(has_opt) + pseudo.length = htonl(ns_size + opt_size + ETH_ALEN); + else + pseudo.length = htonl(ns_size); pseudo.next = htonl(IPPROTO_ICMPV6); /* Generate checksum */ - checksum = inet_checksum(&pseudo, sizeof(pseudo), ~0); + checksum = inet_checksum(&pseudo, sizeof pseudo, ~0); checksum = inet_checksum(&ns, ns_size, checksum); - checksum = inet_checksum(&opt, opt_size, checksum); - checksum = inet_checksum(packet->data + ether_size + ip6_size + ns_size + opt_size, ETH_ALEN, checksum); + if(has_opt) { + checksum = inet_checksum(&opt, opt_size, checksum); + checksum = inet_checksum(DATA(packet) + ether_size + ip6_size + ns_size + opt_size, ETH_ALEN, checksum); + } if(checksum) { - ifdebug(TRAFFIC) logger(LOG_WARNING, _("Cannot route packet: checksum error for neighbor solicitation request")); + logger(DEBUG_TRAFFIC, LOG_WARNING, "Cannot route packet: checksum error for neighbor solicitation request"); return; } @@ -565,7 +781,7 @@ static void route_neighborsol(node_t *source, vpn_packet_t *packet) subnet = lookup_subnet_ipv6((ipv6_t *) &ns.nd_ns_target); if(!subnet) { - ifdebug(TRAFFIC) logger(LOG_WARNING, _("Cannot route packet: neighbor solicitation request for unknown address %hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx"), + 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]), @@ -581,95 +797,88 @@ static void route_neighborsol(node_t *source, vpn_packet_t *packet) /* Check if it is for our own subnet */ if(subnet->owner == myself) - return; /* silently ignore */ + return; /* silently ignore */ + + if(decrement_ttl) + if(!do_decrement_ttl(source, packet)) + return; /* Create neighbor advertation reply */ - memcpy(packet->data, packet->data + ETH_ALEN, ETH_ALEN); /* copy destination address */ - packet->data[ETH_ALEN * 2 - 1] ^= 0xFF; /* mangle source address so it looks like it's not from us */ + memcpy(DATA(packet), DATA(packet) + ETH_ALEN, ETH_ALEN); /* copy destination address */ + DATA(packet)[ETH_ALEN * 2 - 1] ^= 0xFF; /* mangle source address so it looks like it's not from us */ - ip6.ip6_dst = ip6.ip6_src; /* swap destination and source protocoll address */ + ip6.ip6_dst = ip6.ip6_src; /* swap destination and source protocoll address */ ip6.ip6_src = ns.nd_ns_target; - memcpy(packet->data + ether_size + ip6_size + ns_size + opt_size, packet->data + ETH_ALEN, ETH_ALEN); /* add fake source hard addr */ + if(has_opt) + memcpy(DATA(packet) + ether_size + ip6_size + ns_size + opt_size, DATA(packet) + ETH_ALEN, ETH_ALEN); /* add fake source hard addr */ ns.nd_ns_cksum = 0; ns.nd_ns_type = ND_NEIGHBOR_ADVERT; - ns.nd_ns_reserved = htonl(0x40000000UL); /* Set solicited flag */ + ns.nd_ns_reserved = htonl(0x40000000UL); /* Set solicited flag */ opt.nd_opt_type = ND_OPT_TARGET_LINKADDR; /* Create pseudo header */ pseudo.ip6_src = ip6.ip6_src; pseudo.ip6_dst = ip6.ip6_dst; - pseudo.length = htonl(ns_size + opt_size + ETH_ALEN); + if(has_opt) + pseudo.length = htonl(ns_size + opt_size + ETH_ALEN); + else + pseudo.length = htonl(ns_size); pseudo.next = htonl(IPPROTO_ICMPV6); /* Generate checksum */ - checksum = inet_checksum(&pseudo, sizeof(pseudo), ~0); + checksum = inet_checksum(&pseudo, sizeof pseudo, ~0); checksum = inet_checksum(&ns, ns_size, checksum); - checksum = inet_checksum(&opt, opt_size, checksum); - checksum = inet_checksum(packet->data + ether_size + ip6_size + ns_size + opt_size, ETH_ALEN, checksum); + if(has_opt) { + checksum = inet_checksum(&opt, opt_size, checksum); + checksum = inet_checksum(DATA(packet) + ether_size + ip6_size + ns_size + opt_size, ETH_ALEN, checksum); + } ns.nd_ns_hdr.icmp6_cksum = checksum; /* Copy structs on stack back to packet */ - memcpy(packet->data + ether_size, &ip6, ip6_size); - memcpy(packet->data + ether_size + ip6_size, &ns, ns_size); - memcpy(packet->data + ether_size + ip6_size + ns_size, &opt, opt_size); + memcpy(DATA(packet) + ether_size, &ip6, ip6_size); + memcpy(DATA(packet) + ether_size + ip6_size, &ns, ns_size); + if(has_opt) + memcpy(DATA(packet) + ether_size + ip6_size + ns_size, &opt, opt_size); send_packet(source, packet); } -static void route_ipv6(node_t *source, vpn_packet_t *packet) -{ - cp(); - - if(!checklength(source, packet, ether_size + ip6_size)) - return; - - if(packet->data[20] == IPPROTO_ICMPV6 && checklength(source, packet, ether_size + ip6_size + icmp6_size) && packet->data[54] == ND_NEIGHBOR_SOLICIT) { - route_neighborsol(source, packet); - return; - } - - route_ipv6_unicast(source, packet); -} - /* RFC 826 */ -static void route_arp(node_t *source, vpn_packet_t *packet) -{ +static void route_arp(node_t *source, vpn_packet_t *packet) { struct ether_arp arp; subnet_t *subnet; struct in_addr addr; - cp(); - if(!checklength(source, packet, ether_size + arp_size)) return; if(source != myself) { - ifdebug(TRAFFIC) logger(LOG_WARNING, _("Got ARP request from %s (%s) while in router mode!"), source->name, source->hostname); + logger(DEBUG_TRAFFIC, LOG_WARNING, "Got ARP request from %s (%s) while in router mode!", source->name, source->hostname); return; } /* First, snatch the source address from the ARP packet */ if(overwrite_mac) - memcpy(mymac.x, packet->data + ETH_ALEN, ETH_ALEN); + memcpy(mymac.x, DATA(packet) + ETH_ALEN, ETH_ALEN); /* Copy headers from packet to structs on the stack */ - memcpy(&arp, packet->data + ether_size, arp_size); + memcpy(&arp, DATA(packet) + ether_size, arp_size); /* Check if this is a valid ARP request */ if(ntohs(arp.arp_hrd) != ARPHRD_ETHER || ntohs(arp.arp_pro) != ETH_P_IP || - arp.arp_hln != ETH_ALEN || arp.arp_pln != sizeof(addr) || ntohs(arp.arp_op) != ARPOP_REQUEST) { - ifdebug(TRAFFIC) logger(LOG_WARNING, _("Cannot route packet: received unknown type ARP request")); + arp.arp_hln != ETH_ALEN || arp.arp_pln != sizeof addr || ntohs(arp.arp_op) != ARPOP_REQUEST) { + logger(DEBUG_TRAFFIC, LOG_WARNING, "Cannot route packet: received unknown type ARP request"); return; } @@ -678,7 +887,7 @@ static void route_arp(node_t *source, vpn_packet_t *packet) subnet = lookup_subnet_ipv4((ipv4_t *) &arp.arp_tpa); if(!subnet) { - ifdebug(TRAFFIC) logger(LOG_WARNING, _("Cannot route packet: ARP request for unknown address %d.%d.%d.%d"), + 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; @@ -687,56 +896,152 @@ static void route_arp(node_t *source, vpn_packet_t *packet) /* Check if it is for our own subnet */ if(subnet->owner == myself) - return; /* silently ignore */ + return; /* silently ignore */ - memcpy(packet->data, packet->data + ETH_ALEN, ETH_ALEN); /* copy destination address */ - packet->data[ETH_ALEN * 2 - 1] ^= 0xFF; /* mangle source address so it looks like it's not from us */ + if(decrement_ttl) + if(!do_decrement_ttl(source, packet)) + return; - memcpy(&addr, arp.arp_tpa, sizeof(addr)); /* save protocol addr */ - memcpy(arp.arp_tpa, arp.arp_spa, sizeof(addr)); /* swap destination and source protocol address */ - memcpy(arp.arp_spa, &addr, sizeof(addr)); /* ... */ + memcpy(&addr, arp.arp_tpa, sizeof addr); /* save protocol addr */ + memcpy(arp.arp_tpa, arp.arp_spa, sizeof addr); /* swap destination and source protocol address */ + memcpy(arp.arp_spa, &addr, sizeof addr); /* ... */ - memcpy(arp.arp_tha, arp.arp_sha, ETH_ALEN); /* set target hard/proto addr */ - memcpy(arp.arp_sha, packet->data + ETH_ALEN, ETH_ALEN); /* add fake source hard addr */ + memcpy(arp.arp_tha, arp.arp_sha, ETH_ALEN); /* set target hard/proto addr */ + memcpy(arp.arp_sha, DATA(packet) + ETH_ALEN, ETH_ALEN); /* set source hard/proto addr */ + arp.arp_sha[ETH_ALEN - 1] ^= 0xFF; /* for consistency with route_packet() */ arp.arp_op = htons(ARPOP_REPLY); /* Copy structs on stack back to packet */ - memcpy(packet->data + ether_size, &arp, arp_size); + memcpy(DATA(packet) + ether_size, &arp, arp_size); send_packet(source, packet); } -void route(node_t *source, vpn_packet_t *packet) -{ - cp(); +static void route_mac(node_t *source, vpn_packet_t *packet) { + subnet_t *subnet; + mac_t dest; + + /* Learn source address */ + + if(source == myself) { + mac_t src; + memcpy(&src, &DATA(packet)[6], sizeof src); + learn_mac(&src); + } + + /* Lookup destination address */ + + memcpy(&dest, &DATA(packet)[0], sizeof dest); + subnet = lookup_subnet_mac(NULL, &dest); + + if(!subnet || !subnet->owner) { + route_broadcast(source, packet); + return; + } + + if(subnet->owner == source) { + logger(DEBUG_TRAFFIC, LOG_WARNING, "Packet looping back to %s (%s)!", source->name, source->hostname); + return; + } + + if(forwarding_mode == FMODE_OFF && source != myself && subnet->owner != myself) + return; + + if(decrement_ttl && source != myself && subnet->owner != myself) + if(!do_decrement_ttl(source, packet)) + return; + + uint16_t type = DATA(packet)[12] << 8 | DATA(packet)[13]; + + if(priorityinheritance && type == ETH_P_IP && packet->len >= ether_size + ip_size) + packet->priority = DATA(packet)[15]; + + // Handle packets larger than PMTU + + node_t *via = (subnet->owner->via == myself) ? subnet->owner->nexthop : subnet->owner->via; + + if(directonly && subnet->owner != via) + return; + + if(via && packet->len > via->mtu && via != myself) { + logger(DEBUG_TRAFFIC, LOG_INFO, "Packet for %s (%s) length %d larger than MTU %d", subnet->owner->name, subnet->owner->hostname, packet->len, via->mtu); + length_t ethlen = 14; + + if(type == ETH_P_8021Q) { + type = DATA(packet)[16] << 8 | DATA(packet)[17]; + ethlen += 4; + } + + if(type == ETH_P_IP && packet->len > 576 + ethlen) { + if(DATA(packet)[6 + ethlen] & 0x40) { + packet->len = via->mtu; + route_ipv4_unreachable(source, packet, ethlen, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED); + } else { + fragment_ipv4_packet(via, packet, ethlen); + } + return; + } else if(type == ETH_P_IPV6 && packet->len > 1280 + ethlen) { + packet->len = via->mtu; + route_ipv6_unreachable(source, packet, ethlen, ICMP6_PACKET_TOO_BIG, 0); + return; + } + } + + clamp_mss(source, via, packet); + + send_packet(subnet->owner, packet); +} + +static void send_pcap(vpn_packet_t *packet) { + pcap = false; + + for list_each(connection_t, c, connection_list) { + if(!c->status.pcap) + continue; + + pcap = true; + int len = packet->len; + if(c->outmaclength && c->outmaclength < len) + len = c->outmaclength; + + if(send_request(c, "%d %d %d", CONTROL, REQ_PCAP, len)) + send_meta(c, (char *)DATA(packet), len); + } +} + +void route(node_t *source, vpn_packet_t *packet) { + if(pcap) + send_pcap(packet); + + if(forwarding_mode == FMODE_KERNEL && source != myself) { + send_packet(myself, packet); + return; + } if(!checklength(source, packet, ether_size)) return; + uint16_t type = DATA(packet)[12] << 8 | DATA(packet)[13]; + switch (routing_mode) { case RMODE_ROUTER: - { - uint16_t type; - - type = ntohs(*((uint16_t *)(&packet->data[12]))); - switch (type) { - case ETH_P_ARP: - route_arp(source, packet); - break; - - case ETH_P_IP: - route_ipv4(source, packet); - break; - - case ETH_P_IPV6: - route_ipv6(source, packet); - break; - - default: - ifdebug(TRAFFIC) logger(LOG_WARNING, _("Cannot route packet from %s (%s): unknown type %hx"), source->name, source->hostname, type); - break; - } + switch (type) { + case ETH_P_ARP: + route_arp(source, packet); + break; + + case ETH_P_IP: + route_ipv4(source, packet); + break; + + case ETH_P_IPV6: + route_ipv6(source, packet); + break; + + default: + logger(DEBUG_TRAFFIC, LOG_WARNING, "Cannot route packet from %s (%s): unknown type %hx", source->name, source->hostname, type); + break; } break; @@ -745,7 +1050,7 @@ void route(node_t *source, vpn_packet_t *packet) break; case RMODE_HUB: - broadcast_packet(source, packet); + route_broadcast(source, packet); break; } }