#include "system.h"
-#include "avl_tree.h"
+#include "splay_tree.h"
#include "connection.h"
#include "ethernet.h"
#include "ipv4.h"
static const size_t ns_size = sizeof(struct nd_neighbor_solicit);
static const size_t opt_size = sizeof(struct nd_opt_hdr);
+static struct event age_subnets_event;
+
/* RFC 1071 */
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;
+ time_t now = time(NULL);
if(lasttime == now) {
if(++count > frequency)
} 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;
+static void swap_mac_addresses(vpn_packet_t *packet) {
+ mac_t tmp;
+ memcpy(&tmp, &packet->data[0], sizeof tmp);
+ memcpy(&packet->data[0], &packet->data[6], sizeof tmp);
+ memcpy(&packet->data[6], &tmp, sizeof tmp);
}
-
-void age_subnets(void)
+
+static void age_subnets(int fd, short events, void *data)
{
subnet_t *s;
connection_t *c;
- avl_node_t *node, *next, *node2;
+ splay_node_t *node, *next, *node2;
+ bool left = false;
+ time_t now = time(NULL);
cp();
}
subnet_del(myself, s);
+ } else {
+ if(s->expires)
+ left = true;
}
}
+
+ if(left)
+ event_add(&age_subnets_event, &(struct timeval){10, 0});
}
-static void route_mac(node_t *source, vpn_packet_t *packet)
+static void learn_mac(mac_t *address)
{
subnet_t *subnet;
- mac_t dest;
+ splay_node_t *node;
+ connection_t *c;
cp();
+ subnet = lookup_subnet_mac(address);
- /* Learn source address */
+ /* If we don't know this MAC address yet, store it */
- if(source == myself) {
- mac_t src;
- memcpy(&src, &packet->data[6], sizeof src);
- learn_mac(&src);
- }
+ 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]);
- /* Lookup destination address */
+ subnet = new_subnet();
+ subnet->type = SUBNET_MAC;
+ subnet->expires = time(NULL) + macexpire;
+ subnet->net.mac.address = *address;
+ subnet_add(myself, subnet);
- memcpy(&dest, &packet->data[0], sizeof dest);
- subnet = lookup_subnet_mac(&dest);
+ /* And tell all other tinc daemons it's our MAC */
- if(!subnet) {
- broadcast_packet(source, packet);
- return;
- }
+ for(node = connection_tree->head; node; node = node->next) {
+ c = node->data;
+ if(c->status.active)
+ send_add_subnet(c, subnet);
+ }
- if(subnet->owner == source) {
- ifdebug(TRAFFIC) logger(LOG_WARNING, _("Packet looping back to %s (%s)!"), source->name, source->hostname);
- return;
+ if(!timeout_initialized(&age_subnets_event))
+ timeout_set(&age_subnets_event, age_subnets, NULL);
+ event_add(&age_subnets_event, &(struct timeval){10, 0});
+ } else {
+ if(subnet->expires)
+ subnet->expires = time(NULL) + macexpire;
}
-
- send_packet(subnet->owner, packet);
}
/* RFC 792 */
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);
cp();
+ /* Swap Ethernet source and destination addresses */
+
+ swap_mac_addresses(packet);
+
/* Copy headers from packet to structs on the stack */
memcpy(&ip6, packet->data + ether_size, ip6_size);
/* Generate checksum */
- checksum = inet_checksum(&pseudo, sizeof(pseudo), ~0);
+ 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);
/* Generate checksum */
- checksum = inet_checksum(&pseudo, sizeof(pseudo), ~0);
+ checksum = inet_checksum(&pseudo, sizeof pseudo, ~0);
checksum = inet_checksum(&ns, ns_size, checksum);
if(has_opt) {
checksum = inet_checksum(&opt, opt_size, checksum);
/* Generate checksum */
- checksum = inet_checksum(&pseudo, sizeof(pseudo), ~0);
+ checksum = inet_checksum(&pseudo, sizeof pseudo, ~0);
checksum = inet_checksum(&ns, ns_size, checksum);
if(has_opt) {
checksum = inet_checksum(&opt, opt_size, checksum);
/* 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) {
+ 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"));
return;
}
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(&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 */
send_packet(source, packet);
}
+static void route_mac(node_t *source, vpn_packet_t *packet)
+{
+ subnet_t *subnet;
+ mac_t dest;
+
+ cp();
+
+
+ /* Learn source address */
+
+ if(source == myself) {
+ mac_t src;
+ memcpy(&src, &packet->data[6], sizeof src);
+ learn_mac(&src);
+ }
+
+ /* Lookup destination address */
+
+ memcpy(&dest, &packet->data[0], sizeof dest);
+ subnet = lookup_subnet_mac(&dest);
+
+ 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;
+ }
+
+ // Handle packets larger than PMTU
+
+ node_t *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);
+ uint16_t type = packet->data[12] << 8 | packet->data[13];
+ if(type == ETH_P_IP) {
+ 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);
+ }
+ return;
+ } else if(type == ETH_P_IPV6) {
+ packet->len = via->mtu;
+ route_ipv6_unreachable(source, packet, ICMP6_PACKET_TOO_BIG, 0);
+ return;
+ }
+ }
+
+ send_packet(subnet->owner, packet);
+}
+
+
void route(node_t *source, vpn_packet_t *packet)
{
cp();
switch (routing_mode) {
case RMODE_ROUTER:
{
- uint16_t type;
+ uint16_t type = packet->data[12] << 8 | packet->data[13];
- type = ntohs(*((uint16_t *)(&packet->data[12])));
switch (type) {
case ETH_P_ARP:
route_arp(source, packet);
projects / meshlink / blobdiff