/*
net_packet.c -- Handles in- and outgoing VPN packets
Copyright (C) 1998-2005 Ivo Timmermans,
- 2000-2010 Guus Sliepen <guus@tinc-vpn.org>
+ 2000-2011 Guus Sliepen <guus@tinc-vpn.org>
+ 2010 Timothy Redaelli <timothy@redaelli.eu>
+ 2010 Brandon Black <blblack@gmail.com>
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
#include "device.h"
#include "ethernet.h"
#include "graph.h"
-#include "list.h"
#include "logger.h"
#include "net.h"
#include "netutl.h"
#include "xalloc.h"
int keylifetime = 0;
-int keyexpires = 0;
#ifdef HAVE_LZO
static char lzo_wrkmem[LZO1X_999_MEM_COMPRESS > LZO1X_1_MEM_COMPRESS ? LZO1X_999_MEM_COMPRESS : LZO1X_1_MEM_COMPRESS];
#endif
static void send_udppacket(node_t *, vpn_packet_t *);
+unsigned replaywin = 16;
+
#define MAX_SEQNO 1073741824
// mtuprobes == 1..30: initial discovery, send bursts with 1 second interval
}
if(n->mtuprobes > 32) {
+ if(!n->minmtu) {
+ n->mtuprobes = 31;
+ timeout = pinginterval;
+ goto end;
+ }
+
ifdebug(TRAFFIC) logger(LOG_INFO, "%s (%s) did not respond to UDP ping, restarting PMTU discovery", n->name, n->hostname);
n->mtuprobes = 1;
n->minmtu = 0;
n->maxmtu = MTU;
}
- if(n->mtuprobes >= 10 && !n->minmtu) {
+ if(n->mtuprobes >= 10 && n->mtuprobes < 32 && !n->minmtu) {
ifdebug(TRAFFIC) logger(LOG_INFO, "No response to MTU probes from %s (%s)", n->name, n->hostname);
- n->mtuprobes = 0;
- return;
+ n->mtuprobes = 31;
}
if(n->mtuprobes == 30 || (n->mtuprobes < 30 && n->minmtu >= n->maxmtu)) {
send_mtu_probe_handler(0, 0, n);
}
-void mtu_probe_h(node_t *n, vpn_packet_t *packet, length_t len) {
+static void mtu_probe_h(node_t *n, vpn_packet_t *packet, length_t len) {
ifdebug(TRAFFIC) logger(LOG_INFO, "Got MTU probe length %d from %s (%s)", packet->len, n->name, n->hostname);
if(!packet->data[0]) {
packet->data[0] = 1;
send_udppacket(n, packet);
} else {
+ if(n->mtuprobes > 30) {
+ if(n->minmtu)
+ n->mtuprobes = 30;
+ else
+ n->mtuprobes = 1;
+ }
+
if(len > n->maxmtu)
len = n->maxmtu;
if(n->minmtu < len)
n->minmtu = len;
- if(n->mtuprobes > 30)
- n->mtuprobes = 30;
}
}
ifdebug(TRAFFIC) logger(LOG_DEBUG, "Received packet of %d bytes from %s (%s)",
packet->len, n->name, n->hostname);
+ n->in_packets++;
+ n->in_bytes += packet->len;
+
route(n, packet);
}
int nextpkt = 0;
vpn_packet_t *outpkt = pkt[0];
size_t outlen;
- int i;
if(!cipher_active(&n->incipher)) {
ifdebug(TRAFFIC) logger(LOG_DEBUG, "Got packet from %s (%s) but he hasn't got our key yet",
inpkt->len -= sizeof inpkt->seqno;
inpkt->seqno = ntohl(inpkt->seqno);
- if(inpkt->seqno != n->received_seqno + 1) {
- if(inpkt->seqno >= n->received_seqno + sizeof n->late * 8) {
- logger(LOG_WARNING, "Lost %d packets from %s (%s)",
- inpkt->seqno - n->received_seqno - 1, n->name, n->hostname);
-
- memset(n->late, 0, sizeof n->late);
- } else if (inpkt->seqno <= n->received_seqno) {
- if((n->received_seqno >= sizeof n->late * 8 && inpkt->seqno <= n->received_seqno - sizeof n->late * 8) || !(n->late[(inpkt->seqno / 8) % sizeof n->late] & (1 << inpkt->seqno % 8))) {
- logger(LOG_WARNING, "Got late or replayed packet from %s (%s), seqno %d, last received %d",
- n->name, n->hostname, inpkt->seqno, n->received_seqno);
- return;
+ if(replaywin) {
+ if(inpkt->seqno != n->received_seqno + 1) {
+ if(inpkt->seqno >= n->received_seqno + replaywin * 8) {
+ if(n->farfuture++ < replaywin >> 2) {
+ logger(LOG_WARNING, "Packet from %s (%s) is %d seqs in the future, dropped (%u)",
+ n->name, n->hostname, inpkt->seqno - n->received_seqno - 1, n->farfuture);
+ return;
+ }
+ logger(LOG_WARNING, "Lost %d packets from %s (%s)",
+ inpkt->seqno - n->received_seqno - 1, n->name, n->hostname);
+ memset(n->late, 0, replaywin);
+ } else if (inpkt->seqno <= n->received_seqno) {
+ if((n->received_seqno >= replaywin * 8 && inpkt->seqno <= n->received_seqno - replaywin * 8) || !(n->late[(inpkt->seqno / 8) % replaywin] & (1 << inpkt->seqno % 8))) {
+ logger(LOG_WARNING, "Got late or replayed packet from %s (%s), seqno %d, last received %d",
+ n->name, n->hostname, inpkt->seqno, n->received_seqno);
+ return;
+ }
+ } else {
+ for(int i = n->received_seqno + 1; i < inpkt->seqno; i++)
+ n->late[(i / 8) % replaywin] |= 1 << i % 8;
}
- } else {
- for(i = n->received_seqno + 1; i < inpkt->seqno; i++)
- n->late[(i / 8) % sizeof n->late] |= 1 << i % 8;
}
+
+ n->farfuture = 0;
+ n->late[(inpkt->seqno / 8) % replaywin] &= ~(1 << inpkt->seqno % 8);
}
-
- n->late[(inpkt->seqno / 8) % sizeof n->late] &= ~(1 << inpkt->seqno % 8);
if(inpkt->seqno > n->received_seqno)
n->received_seqno = inpkt->seqno;
receive_packet(n, inpkt);
}
-void receive_tcppacket(connection_t *c, char *buffer, int len) {
+void receive_tcppacket(connection_t *c, const char *buffer, int len) {
vpn_packet_t outpkt;
outpkt.len = len;
vpn_packet_t *inpkt = origpkt;
int nextpkt = 0;
vpn_packet_t *outpkt;
- int origlen;
+ int origlen = origpkt->len;
size_t outlen;
+#if defined(SOL_IP) && defined(IP_TOS)
static int priority = 0;
- int origpriority;
+ int origpriority = origpkt->priority;
+#endif
int sock;
if(!n->status.reachable) {
"No valid key known yet for %s (%s), forwarding via TCP",
n->name, n->hostname);
- if(n->last_req_key + 10 < now) {
+ if(n->last_req_key + 10 <= now) {
send_req_key(n);
n->last_req_key = now;
}
return;
}
- origlen = inpkt->len;
- origpriority = inpkt->priority;
-
/* Compress the packet */
if(n->outcompression) {
/*
send a packet to the given vpn ip.
*/
-void send_packet(const node_t *n, vpn_packet_t *packet) {
+void send_packet(node_t *n, vpn_packet_t *packet) {
node_t *via;
if(n == myself) {
if(overwrite_mac)
memcpy(packet->data, mymac.x, ETH_ALEN);
+ n->out_packets++;
+ n->out_bytes += packet->len;
write_packet(packet);
return;
}
return;
}
+ n->out_packets++;
+ n->out_bytes += packet->len;
+
via = (packet->priority == -1 || n->via == myself) ? n->nexthop : n->via;
if(via != n)
static node_t *try_harder(const sockaddr_t *from, const vpn_packet_t *pkt) {
splay_node_t *node;
- node_t *n, *found = NULL;
+ edge_t *e;
+ node_t *n = NULL;
+ bool hard = false;
static time_t last_hard_try = 0;
time_t now = time(NULL);
else
last_hard_try = now;
- for(node = node_tree->head; node; node = node->next) {
- n = node->data;
+ for(node = edge_weight_tree->head; node; node = node->next) {
+ e = node->data;
- if(n == myself || !n->status.reachable || !digest_active(&n->indigest))
+ if(e->to == myself)
continue;
- if(try_mac(n, pkt)) {
- found = n;
- break;
+ if(sockaddrcmp_noport(from, &e->address)) {
+ if(last_hard_try == now)
+ continue;
+ hard = true;
}
+
+ if(!try_mac(e->to, pkt))
+ continue;
+
+ n = e->to;
+ break;
}
- return found;
+ if(hard)
+ last_hard_try = now;
+
+ return n;
}
void handle_incoming_vpn_data(int sock, short events, void *data) {
void handle_device_data(int sock, short events, void *data) {
vpn_packet_t packet;
- if(read_packet(&packet))
+ packet.priority = 0;
+
+ if(read_packet(&packet)) {
+ myself->in_packets++;
+ myself->in_bytes += packet.len;
route(myself, &packet);
+ }
}