/*
net_packet.c -- Handles in- and outgoing VPN packets
Copyright (C) 1998-2005 Ivo Timmermans,
- 2000-2014 Guus Sliepen <guus@tinc-vpn.org>
+ 2000-2018 Guus Sliepen <guus@tinc-vpn.org>
2010 Timothy Redaelli <timothy@redaelli.eu>
2010 Brandon Black <blblack@gmail.com>
#include "system.h"
#ifdef HAVE_ZLIB
+#define ZLIB_CONST
#include <zlib.h>
#endif
#include LZO1X_H
#endif
+#include "address_cache.h"
#include "cipher.h"
#include "conf.h"
#include "connection.h"
#define MAX(a, b) ((a) > (b) ? (a) : (b))
#endif
+/* The minimum size of a probe is 14 bytes, but since we normally use CBC mode
+ encryption, we can add a few extra random bytes without increasing the
+ resulting packet size. */
+#define MIN_PROBE_SIZE 18
+
int keylifetime = 0;
#ifdef HAVE_LZO
static char lzo_wrkmem[LZO1X_999_MEM_COMPRESS > LZO1X_1_MEM_COMPRESS ? LZO1X_999_MEM_COMPRESS : LZO1X_1_MEM_COMPRESS];
static void send_udppacket(node_t *, vpn_packet_t *);
-unsigned replaywin = 16;
+unsigned replaywin = 32;
bool localdiscovery = true;
bool udp_discovery = true;
-int udp_discovery_interval = 9;
+int udp_discovery_keepalive_interval = 10;
+int udp_discovery_interval = 2;
int udp_discovery_timeout = 30;
#define MAX_SEQNO 1073741824
static void try_fix_mtu(node_t *n) {
- if(n->mtuprobes < 0)
+ if(n->mtuprobes < 0) {
return;
+ }
if(n->mtuprobes == 20 || n->minmtu >= n->maxmtu) {
- if(n->minmtu > n->maxmtu)
+ if(n->minmtu > n->maxmtu) {
n->minmtu = n->maxmtu;
- else
+ } else {
n->maxmtu = n->minmtu;
+ }
+
n->mtu = n->minmtu;
logger(DEBUG_TRAFFIC, LOG_INFO, "Fixing MTU of %s (%s) to %d after %d probes", n->name, n->hostname, n->mtu, n->mtuprobes);
n->mtuprobes = -1;
static void udp_probe_timeout_handler(void *data) {
node_t *n = data;
- if(!n->status.udp_confirmed)
+
+ if(!n->status.udp_confirmed) {
return;
+ }
logger(DEBUG_TRAFFIC, LOG_INFO, "Too much time has elapsed since last UDP ping response from %s (%s), stopping UDP communication", n->name, n->hostname);
n->status.udp_confirmed = false;
+ n->udp_ping_rtt = -1;
+ n->maxrecentlen = 0;
n->mtuprobes = 0;
n->minmtu = 0;
n->maxmtu = MTU;
}
+static void send_udp_probe_reply(node_t *n, vpn_packet_t *packet, length_t len) {
+ if(!n->status.sptps && !n->status.validkey) {
+ logger(DEBUG_TRAFFIC, LOG_INFO, "Trying to send UDP probe reply to %s (%s) but we don't have his key yet", n->name, n->hostname);
+ return;
+ }
+
+ /* Type 2 probe replies were introduced in protocol 17.3 */
+ if((n->options >> 24) >= 3) {
+ DATA(packet)[0] = 2;
+ uint16_t len16 = htons(len);
+ memcpy(DATA(packet) + 1, &len16, 2);
+ packet->len = MIN_PROBE_SIZE;
+ logger(DEBUG_TRAFFIC, LOG_INFO, "Sending type 2 probe reply length %u to %s (%s)", len, n->name, n->hostname);
+
+ } else {
+ /* Legacy protocol: n won't understand type 2 probe replies. */
+ DATA(packet)[0] = 1;
+ logger(DEBUG_TRAFFIC, LOG_INFO, "Sending type 1 probe reply length %u to %s (%s)", len, n->name, n->hostname);
+ }
+
+ /* Temporarily set udp_confirmed, so that the reply is sent
+ back exactly the way it came in. */
+
+ bool udp_confirmed = n->status.udp_confirmed;
+ n->status.udp_confirmed = true;
+ send_udppacket(n, packet);
+ n->status.udp_confirmed = udp_confirmed;
+}
+
static void udp_probe_h(node_t *n, vpn_packet_t *packet, length_t len) {
if(!DATA(packet)[0]) {
logger(DEBUG_TRAFFIC, LOG_INFO, "Got UDP probe request %d from %s (%s)", packet->len, n->name, n->hostname);
+ send_udp_probe_reply(n, packet, len);
+ return;
+ }
- /* It's a probe request, send back a reply */
-
- /* Type 2 probe replies were introduced in protocol 17.3 */
- if ((n->options >> 24) >= 3) {
- uint8_t *data = DATA(packet);
- *data++ = 2;
- uint16_t len16 = htons(len); memcpy(data, &len16, 2); data += 2;
- struct timeval now;
- gettimeofday(&now, NULL);
- uint32_t sec = htonl(now.tv_sec); memcpy(data, &sec, 4); data += 4;
- uint32_t usec = htonl(now.tv_usec); memcpy(data, &usec, 4); data += 4;
- packet->len -= 10;
- } else {
- /* Legacy protocol: n won't understand type 2 probe replies. */
- DATA(packet)[0] = 1;
- }
-
- /* Temporarily set udp_confirmed, so that the reply is sent
- back exactly the way it came in. */
+ if(DATA(packet)[0] == 2) {
+ // It's a type 2 probe reply, use the length field inside the packet
+ uint16_t len16;
+ memcpy(&len16, DATA(packet) + 1, 2);
+ len = ntohs(len16);
+ }
- bool udp_confirmed = n->status.udp_confirmed;
- n->status.udp_confirmed = true;
- send_udppacket(n, packet);
- n->status.udp_confirmed = udp_confirmed;
+ if(n->udp_ping_sent.tv_sec != 0) { // a probe in flight
+ gettimeofday(&now, NULL);
+ struct timeval rtt;
+ timersub(&now, &n->udp_ping_sent, &rtt);
+ n->udp_ping_rtt = rtt.tv_sec * 1000000 + rtt.tv_usec;
+ logger(DEBUG_TRAFFIC, LOG_INFO, "Got type %d UDP probe reply %d from %s (%s) rtt=%d.%03d", DATA(packet)[0], len, n->name, n->hostname, n->udp_ping_rtt / 1000, n->udp_ping_rtt % 1000);
} else {
- length_t probelen = len;
- if (DATA(packet)[0] == 2) {
- if (len < 3)
- logger(DEBUG_TRAFFIC, LOG_WARNING, "Received invalid (too short) UDP probe reply from %s (%s)", n->name, n->hostname);
- else {
- uint16_t probelen16; memcpy(&probelen16, DATA(packet) + 1, 2); probelen = ntohs(probelen16);
- }
- }
- logger(DEBUG_TRAFFIC, LOG_INFO, "Got type %d UDP probe reply %d from %s (%s)", DATA(packet)[0], probelen, n->name, n->hostname);
+ logger(DEBUG_TRAFFIC, LOG_INFO, "Got type %d UDP probe reply %d from %s (%s)", DATA(packet)[0], len, n->name, n->hostname);
+ }
- /* It's a valid reply: now we know bidirectional communication
- is possible using the address and socket that the reply
- packet used. */
+ /* It's a valid reply: now we know bidirectional communication
+ is possible using the address and socket that the reply
+ packet used. */
+ if(!n->status.udp_confirmed) {
n->status.udp_confirmed = true;
- if(udp_discovery) {
- timeout_del(&n->udp_ping_timeout);
- timeout_add(&n->udp_ping_timeout, &udp_probe_timeout_handler, n, &(struct timeval){udp_discovery_timeout, 0});
+ if(!n->address_cache) {
+ n->address_cache = open_address_cache(n);
}
- if(probelen >= n->maxmtu + 1) {
- logger(DEBUG_TRAFFIC, LOG_INFO, "Increase in PMTU to %s (%s) detected, restarting PMTU discovery", n->name, n->hostname);
- n->maxmtu = MTU;
- /* Set mtuprobes to 1 so that try_mtu() doesn't reset maxmtu */
- n->mtuprobes = 1;
- return;
- }
+ reset_address_cache(n->address_cache, &n->address);
+ }
- /* If applicable, raise the minimum supported MTU */
+ // Reset the UDP ping timer. (no probe in flight)
+ n->udp_ping_sent.tv_sec = 0;
- if(probelen > n->maxmtu)
- probelen = n->maxmtu;
- if(n->minmtu < probelen) {
- n->minmtu = probelen;
- try_fix_mtu(n);
- }
-
- /* Calculate RTT.
- The RTT is the time between the MTU probe burst was sent and the first
- reply is received.
- */
+ if(udp_discovery) {
+ timeout_del(&n->udp_ping_timeout);
+ timeout_add(&n->udp_ping_timeout, &udp_probe_timeout_handler, n, &(struct timeval) {
+ udp_discovery_timeout, 0
+ });
+ }
- struct timeval now, diff;
- gettimeofday(&now, NULL);
- timersub(&now, &n->probe_time, &diff);
+ if(len > n->maxmtu) {
+ logger(DEBUG_TRAFFIC, LOG_INFO, "Increase in PMTU to %s (%s) detected, restarting PMTU discovery", n->name, n->hostname);
+ n->minmtu = len;
+ n->maxmtu = MTU;
+ /* Set mtuprobes to 1 so that try_mtu() doesn't reset maxmtu */
+ n->mtuprobes = 1;
+ return;
+ } else if(n->mtuprobes < 0 && len == n->maxmtu) {
+ /* We got a maxmtu sized packet, confirming the PMTU is still valid. */
+ n->mtuprobes = -1;
+ n->mtu_ping_sent = now;
+ }
- struct timeval probe_timestamp = now;
- if (DATA(packet)[0] == 2 && packet->len >= 11) {
- uint32_t sec; memcpy(&sec, DATA(packet) + 3, 4);
- uint32_t usec; memcpy(&usec, DATA(packet) + 7, 4);
- probe_timestamp.tv_sec = ntohl(sec);
- probe_timestamp.tv_usec = ntohl(usec);
- }
-
- n->probe_counter++;
+ /* If applicable, raise the minimum supported MTU */
- if(n->probe_counter == 1) {
- n->rtt = diff.tv_sec + diff.tv_usec * 1e-6;
- n->probe_time = probe_timestamp;
- logger(DEBUG_TRAFFIC, LOG_DEBUG, "%s (%s) RTT %.2f ms, rx packet loss %.2f %%", n->name, n->hostname, n->rtt * 1e3, n->packetloss * 1e2);
- }
+ if(n->minmtu < len) {
+ n->minmtu = len;
+ try_fix_mtu(n);
}
}
lzo1x_1_compress(source, len, dest, &lzolen, lzo_wrkmem);
return lzolen;
#else
- return -1;
+ return 0;
#endif
} else if(level < 10) {
#ifdef HAVE_ZLIB
unsigned long destlen = MAXSIZE;
- if(compress2(dest, &destlen, source, len, level) == Z_OK)
+
+ if(compress2(dest, &destlen, source, len, level) == Z_OK) {
return destlen;
- else
+ } else
#endif
- return -1;
+ return 0;
} else {
#ifdef HAVE_LZO
lzo_uint lzolen = MAXSIZE;
lzo1x_999_compress(source, len, dest, &lzolen, lzo_wrkmem);
return lzolen;
#else
- return -1;
+ return 0;
#endif
}
- return -1;
+ return 0;
}
static length_t uncompress_packet(uint8_t *dest, const uint8_t *source, length_t len, int level) {
} else if(level > 9) {
#ifdef HAVE_LZO
lzo_uint lzolen = MAXSIZE;
- if(lzo1x_decompress_safe(source, len, dest, &lzolen, NULL) == LZO_E_OK)
+
+ if(lzo1x_decompress_safe(source, len, dest, &lzolen, NULL) == LZO_E_OK) {
return lzolen;
- else
+ } else
#endif
- return -1;
+ return 0;
}
+
#ifdef HAVE_ZLIB
else {
unsigned long destlen = MAXSIZE;
- if(uncompress(dest, &destlen, source, len) == Z_OK)
- return destlen;
- else
- return -1;
+ static z_stream stream;
+
+ if(stream.next_in) {
+ inflateReset(&stream);
+ } else {
+ inflateInit(&stream);
+ }
+
+ stream.next_in = source;
+ stream.avail_in = len;
+ stream.next_out = dest;
+ stream.avail_out = destlen;
+ stream.total_out = 0;
+
+ if(inflate(&stream, Z_FINISH) == Z_STREAM_END) {
+ return stream.total_out;
+ } else {
+ return 0;
+ }
}
+
#endif
- return -1;
+ return 0;
}
/* VPN packet I/O */
static void receive_packet(node_t *n, vpn_packet_t *packet) {
logger(DEBUG_TRAFFIC, LOG_DEBUG, "Received packet of %d bytes from %s (%s)",
- packet->len, n->name, n->hostname);
+ packet->len, n->name, n->hostname);
n->in_packets++;
n->in_bytes += packet->len;
}
static bool try_mac(node_t *n, const vpn_packet_t *inpkt) {
- if(n->status.sptps)
+ if(n->status.sptps) {
return sptps_verify_datagram(&n->sptps, DATA(inpkt), inpkt->len);
+ }
#ifdef DISABLE_LEGACY
return false;
#else
- if(!digest_active(n->indigest) || inpkt->len < sizeof(seqno_t) + digest_length(n->indigest))
+
+ if(!n->status.validkey_in || !digest_active(n->indigest) || (size_t)inpkt->len < sizeof(seqno_t) + digest_length(n->indigest)) {
return false;
+ }
- return digest_verify(n->indigest, SEQNO(inpkt), inpkt->len - digest_length(n->indigest), DATA(inpkt) + inpkt->len - digest_length(n->indigest));
+ return digest_verify(n->indigest, inpkt->data, inpkt->len - digest_length(n->indigest), inpkt->data + inpkt->len - digest_length(n->indigest));
#endif
}
static bool receive_udppacket(node_t *n, vpn_packet_t *inpkt) {
- vpn_packet_t pkt1, pkt2;
- vpn_packet_t *pkt[] = { &pkt1, &pkt2, &pkt1, &pkt2 };
- int nextpkt = 0;
- size_t outlen;
- pkt1.offset = DEFAULT_PACKET_OFFSET;
- pkt2.offset = DEFAULT_PACKET_OFFSET;
-
if(n->status.sptps) {
if(!n->sptps.state) {
if(!n->status.waitingforkey) {
} else {
logger(DEBUG_TRAFFIC, LOG_DEBUG, "Got packet from %s (%s) but he hasn't got our key yet", n->name, n->hostname);
}
+
return false;
}
- inpkt->offset += 2 * sizeof(node_id_t);
- if(!sptps_receive_data(&n->sptps, DATA(inpkt), inpkt->len - 2 * sizeof(node_id_t))) {
- logger(DEBUG_TRAFFIC, LOG_ERR, "Got bad packet from %s (%s)", n->name, n->hostname);
+
+ n->status.udppacket = true;
+ bool result = sptps_receive_data(&n->sptps, DATA(inpkt), inpkt->len);
+ n->status.udppacket = false;
+
+ if(!result) {
+ /* Uh-oh. It might be that the tunnel is stuck in some corrupted state,
+ so let's restart SPTPS in case that helps. But don't do that too often
+ to prevent storms, and because that would make life a little too easy
+ for external attackers trying to DoS us. */
+ if(n->last_req_key < now.tv_sec - 10) {
+ logger(DEBUG_PROTOCOL, LOG_ERR, "Failed to decode raw TCP packet from %s (%s), restarting SPTPS", n->name, n->hostname);
+ send_req_key(n);
+ }
+
return false;
}
+
return true;
}
#ifdef DISABLE_LEGACY
return false;
#else
- if(!n->status.validkey) {
+ vpn_packet_t pkt1, pkt2;
+ vpn_packet_t *pkt[] = { &pkt1, &pkt2, &pkt1, &pkt2 };
+ int nextpkt = 0;
+ size_t outlen;
+ pkt1.offset = DEFAULT_PACKET_OFFSET;
+ pkt2.offset = DEFAULT_PACKET_OFFSET;
+
+ if(!n->status.validkey_in) {
logger(DEBUG_TRAFFIC, LOG_DEBUG, "Got packet from %s (%s) but he hasn't got our key yet", n->name, n->hostname);
return false;
}
/* Check packet length */
- if(inpkt->len < sizeof(seqno_t) + digest_length(n->indigest)) {
+ if((size_t)inpkt->len < sizeof(seqno_t) + digest_length(n->indigest)) {
logger(DEBUG_TRAFFIC, LOG_DEBUG, "Got too short packet from %s (%s)",
- n->name, n->hostname);
+ n->name, n->hostname);
return false;
}
if(digest_active(n->indigest)) {
inpkt->len -= digest_length(n->indigest);
+
if(!digest_verify(n->indigest, SEQNO(inpkt), inpkt->len, SEQNO(inpkt) + inpkt->len)) {
logger(DEBUG_TRAFFIC, LOG_DEBUG, "Got unauthenticated packet from %s (%s)", n->name, n->hostname);
return false;
}
}
+
/* Decrypt the packet */
if(cipher_active(n->incipher)) {
/* Check the sequence number */
seqno_t seqno;
- memcpy(&seqno, SEQNO(inpkt), sizeof seqno);
+ memcpy(&seqno, SEQNO(inpkt), sizeof(seqno));
seqno = ntohl(seqno);
- inpkt->len -= sizeof seqno;
+ inpkt->len -= sizeof(seqno);
if(replaywin) {
if(seqno != n->received_seqno + 1) {
if(seqno >= n->received_seqno + replaywin * 8) {
if(n->farfuture++ < replaywin >> 2) {
- logger(DEBUG_ALWAYS, LOG_WARNING, "Packet from %s (%s) is %d seqs in the future, dropped (%u)",
- n->name, n->hostname, seqno - n->received_seqno - 1, n->farfuture);
+ logger(DEBUG_TRAFFIC, LOG_WARNING, "Packet from %s (%s) is %d seqs in the future, dropped (%u)",
+ n->name, n->hostname, seqno - n->received_seqno - 1, n->farfuture);
return false;
}
- logger(DEBUG_ALWAYS, LOG_WARNING, "Lost %d packets from %s (%s)",
- seqno - n->received_seqno - 1, n->name, n->hostname);
+
+ logger(DEBUG_TRAFFIC, LOG_WARNING, "Lost %d packets from %s (%s)",
+ seqno - n->received_seqno - 1, n->name, n->hostname);
memset(n->late, 0, replaywin);
- } else if (seqno <= n->received_seqno) {
+ } else if(seqno <= n->received_seqno) {
if((n->received_seqno >= replaywin * 8 && seqno <= n->received_seqno - replaywin * 8) || !(n->late[(seqno / 8) % replaywin] & (1 << seqno % 8))) {
- logger(DEBUG_ALWAYS, LOG_WARNING, "Got late or replayed packet from %s (%s), seqno %d, last received %d",
- n->name, n->hostname, seqno, n->received_seqno);
+ logger(DEBUG_TRAFFIC, LOG_WARNING, "Got late or replayed packet from %s (%s), seqno %d, last received %d",
+ n->name, n->hostname, seqno, n->received_seqno);
return false;
}
} else {
- for(int i = n->received_seqno + 1; i < seqno; i++)
+ for(seqno_t i = n->received_seqno + 1; i < seqno; i++) {
n->late[(i / 8) % replaywin] |= 1 << i % 8;
+ }
}
}
n->late[(seqno / 8) % replaywin] &= ~(1 << seqno % 8);
}
- if(seqno > n->received_seqno)
+ if(seqno > n->received_seqno) {
n->received_seqno = seqno;
+ }
n->received++;
- if(n->received_seqno > MAX_SEQNO)
+ if(n->received_seqno > MAX_SEQNO) {
regenerate_key();
+ }
/* Decompress the packet */
if(n->incompression) {
vpn_packet_t *outpkt = pkt[nextpkt++];
- if((outpkt->len = uncompress_packet(DATA(outpkt), DATA(inpkt), inpkt->len, n->incompression)) < 0) {
+ if(!(outpkt->len = uncompress_packet(DATA(outpkt), DATA(inpkt), inpkt->len, n->incompression))) {
logger(DEBUG_TRAFFIC, LOG_ERR, "Error while uncompressing packet from %s (%s)",
- n->name, n->hostname);
+ n->name, n->hostname);
return false;
}
inpkt = outpkt;
- origlen -= MTU/64 + 20;
+ if(origlen > MTU / 64 + 20) {
+ origlen -= MTU / 64 + 20;
+ } else {
+ origlen = 0;
+ }
+ }
+
+ if(inpkt->len > n->maxrecentlen) {
+ n->maxrecentlen = inpkt->len;
}
inpkt->priority = 0;
- if(!DATA(inpkt)[12] && !DATA(inpkt)[13])
+ if(!DATA(inpkt)[12] && !DATA(inpkt)[13]) {
udp_probe_h(n, inpkt, origlen);
- else
+ } else {
receive_packet(n, inpkt);
+ }
+
return true;
#endif
}
-void receive_tcppacket(connection_t *c, const char *buffer, int len) {
+void receive_tcppacket(connection_t *c, const char *buffer, size_t len) {
vpn_packet_t outpkt;
outpkt.offset = DEFAULT_PACKET_OFFSET;
- if(len > sizeof outpkt.data - outpkt.offset)
+ if(len > sizeof(outpkt.data) - outpkt.offset) {
return;
+ }
outpkt.len = len;
- if(c->options & OPTION_TCPONLY)
+
+ if(c->options & OPTION_TCPONLY) {
outpkt.priority = 0;
- else
+ } else {
outpkt.priority = -1;
+ }
+
memcpy(DATA(&outpkt), buffer, len);
receive_packet(c->node, &outpkt);
}
+bool receive_tcppacket_sptps(connection_t *c, const char *data, size_t len) {
+ if(len < sizeof(node_id_t) + sizeof(node_id_t)) {
+ logger(DEBUG_PROTOCOL, LOG_ERR, "Got too short TCP SPTPS packet from %s (%s)", c->name, c->hostname);
+ return false;
+ }
+
+ node_t *to = lookup_node_id((node_id_t *)data);
+ data += sizeof(node_id_t);
+ len -= sizeof(node_id_t);
+
+ if(!to) {
+ logger(DEBUG_PROTOCOL, LOG_ERR, "Got TCP SPTPS packet from %s (%s) with unknown destination ID", c->name, c->hostname);
+ return true;
+ }
+
+ node_t *from = lookup_node_id((node_id_t *)data);
+ data += sizeof(node_id_t);
+ len -= sizeof(node_id_t);
+
+ if(!from) {
+ logger(DEBUG_PROTOCOL, LOG_ERR, "Got TCP SPTPS packet from %s (%s) with unknown source ID", c->name, c->hostname);
+ return true;
+ }
+
+ if(!to->status.reachable) {
+ /* This can happen in the form of a race condition
+ if the node just became unreachable. */
+ logger(DEBUG_TRAFFIC, LOG_WARNING, "Cannot relay TCP packet from %s (%s) because the destination, %s (%s), is unreachable", from->name, from->hostname, to->name, to->hostname);
+ return true;
+ }
+
+ /* Help the sender reach us over UDP.
+ Note that we only do this if we're the destination or the static relay;
+ otherwise every hop would initiate its own UDP info message, resulting in elevated chatter. */
+ if(to->via == myself) {
+ send_udp_info(myself, from);
+ }
+
+ /* If we're not the final recipient, relay the packet. */
+
+ if(to != myself) {
+ send_sptps_data(to, from, 0, data, len);
+ try_tx(to, true);
+ return true;
+ }
+
+ /* The packet is for us */
+
+ if(!sptps_receive_data(&from->sptps, data, len)) {
+ /* Uh-oh. It might be that the tunnel is stuck in some corrupted state,
+ so let's restart SPTPS in case that helps. But don't do that too often
+ to prevent storms. */
+ if(from->last_req_key < now.tv_sec - 10) {
+ logger(DEBUG_PROTOCOL, LOG_ERR, "Failed to decode raw TCP packet from %s (%s), restarting SPTPS", from->name, from->hostname);
+ send_req_key(from);
+ }
+
+ return true;
+ }
+
+ send_mtu_info(myself, from, MTU);
+ return true;
+}
+
static void send_sptps_packet(node_t *n, vpn_packet_t *origpkt) {
- if(!n->status.validkey && !n->connection)
+ if(!n->status.validkey && !n->connection) {
return;
+ }
uint8_t type = 0;
int offset = 0;
- if(!(DATA(origpkt)[12] | DATA(origpkt)[13])) {
+ if((!(DATA(origpkt)[12] | DATA(origpkt)[13])) && (n->sptps.outstate)) {
sptps_send_record(&n->sptps, PKT_PROBE, (char *)DATA(origpkt), origpkt->len);
return;
}
- if(routing_mode == RMODE_ROUTER)
+ if(routing_mode == RMODE_ROUTER) {
offset = 14;
- else
+ } else {
type = PKT_MAC;
+ }
- if(origpkt->len < offset)
+ if(origpkt->len < offset) {
return;
+ }
vpn_packet_t outpkt;
if(n->outcompression) {
outpkt.offset = 0;
- int len = compress_packet(DATA(&outpkt) + offset, DATA(origpkt) + offset, origpkt->len - offset, n->outcompression);
- if(len < 0) {
+ length_t len = compress_packet(DATA(&outpkt) + offset, DATA(origpkt) + offset, origpkt->len - offset, n->outcompression);
+
+ if(!len) {
logger(DEBUG_TRAFFIC, LOG_ERR, "Error while compressing packet to %s (%s)", n->name, n->hostname);
} else if(len < origpkt->len - offset) {
outpkt.len = len + offset;
don't bother with SPTPS and just use a "plaintext" PACKET message.
We don't really care about end-to-end security since we're not
sending the message through any intermediate nodes. */
- if(n->connection && origpkt->len > n->minmtu)
+ if(n->connection && origpkt->len > n->minmtu) {
send_tcppacket(n->connection, origpkt);
- else
+ } else {
sptps_send_record(&n->sptps, type, DATA(origpkt) + offset, origpkt->len - offset);
+ }
+
return;
}
*sock = n->sock;
/* If the UDP address is confirmed, use it. */
- if(n->status.udp_confirmed)
+ if(n->status.udp_confirmed) {
return;
+ }
/* Send every third packet to n->address; that could be set
to the node's reflexive UDP address discovered during key
exchange. */
static int x = 0;
+
if(++x >= 3) {
x = 0;
return;
}
}
- if (candidate && candidate->local_address.sa.sa_family) {
+ if(candidate && candidate->local_address.sa.sa_family) {
*sa = &candidate->local_address;
*sock = rand() % listen_sockets;
adapt_socket(*sa, sock);
}
static void send_udppacket(node_t *n, vpn_packet_t *origpkt) {
+ if(!n->status.reachable) {
+ logger(DEBUG_TRAFFIC, LOG_INFO, "Trying to send UDP packet to unreachable node %s (%s)", n->name, n->hostname);
+ return;
+ }
+
+ if(n->status.sptps) {
+ send_sptps_packet(n, origpkt);
+ return;
+ }
+
+#ifdef DISABLE_LEGACY
+ return;
+#else
vpn_packet_t pkt1, pkt2;
vpn_packet_t *pkt[] = { &pkt1, &pkt2, &pkt1, &pkt2 };
vpn_packet_t *inpkt = origpkt;
vpn_packet_t *outpkt;
int origlen = origpkt->len;
size_t outlen;
-#if defined(SOL_IP) && defined(IP_TOS)
- static int priority = 0;
int origpriority = origpkt->priority;
-#endif
pkt1.offset = DEFAULT_PACKET_OFFSET;
pkt2.offset = DEFAULT_PACKET_OFFSET;
- if(!n->status.reachable) {
- logger(DEBUG_TRAFFIC, LOG_INFO, "Trying to send UDP packet to unreachable node %s (%s)", n->name, n->hostname);
- return;
- }
-
- if(n->status.sptps)
- return send_sptps_packet(n, origpkt);
-
-#ifdef DISABLE_LEGACY
- return;
-#else
/* Make sure we have a valid key */
if(!n->status.validkey) {
logger(DEBUG_TRAFFIC, LOG_INFO,
- "No valid key known yet for %s (%s), forwarding via TCP",
- n->name, n->hostname);
+ "No valid key known yet for %s (%s), forwarding via TCP",
+ n->name, n->hostname);
send_tcppacket(n->nexthop->connection, origpkt);
return;
}
if(n->options & OPTION_PMTU_DISCOVERY && inpkt->len > n->minmtu && (DATA(inpkt)[12] | DATA(inpkt)[13])) {
logger(DEBUG_TRAFFIC, LOG_INFO,
- "Packet for %s (%s) larger than minimum MTU, forwarding via %s",
- n->name, n->hostname, n != n->nexthop ? n->nexthop->name : "TCP");
+ "Packet for %s (%s) larger than minimum MTU, forwarding via %s",
+ n->name, n->hostname, n != n->nexthop ? n->nexthop->name : "TCP");
- if(n != n->nexthop)
+ if(n != n->nexthop) {
send_packet(n->nexthop, origpkt);
- else
+ } else {
send_tcppacket(n->nexthop->connection, origpkt);
+ }
return;
}
if(n->outcompression) {
outpkt = pkt[nextpkt++];
- if((outpkt->len = compress_packet(DATA(outpkt), DATA(inpkt), inpkt->len, n->outcompression)) < 0) {
+ if(!(outpkt->len = compress_packet(DATA(outpkt), DATA(inpkt), inpkt->len, n->outcompression))) {
logger(DEBUG_TRAFFIC, LOG_ERR, "Error while compressing packet to %s (%s)",
- n->name, n->hostname);
+ n->name, n->hostname);
return;
}
/* Add sequence number */
seqno_t seqno = htonl(++(n->sent_seqno));
- memcpy(SEQNO(inpkt), &seqno, sizeof seqno);
- inpkt->len += sizeof seqno;
+ memcpy(SEQNO(inpkt), &seqno, sizeof(seqno));
+ inpkt->len += sizeof(seqno);
/* Encrypt the packet */
const sockaddr_t *sa = NULL;
int sock;
- if(n->status.send_locally)
+ if(n->status.send_locally) {
choose_local_address(n, &sa, &sock);
- if(!sa)
- choose_udp_address(n, &sa, &sock);
+ }
-#if defined(SOL_IP) && defined(IP_TOS)
- if(priorityinheritance && origpriority != priority
- && listen_socket[n->sock].sa.sa.sa_family == AF_INET) {
- priority = origpriority;
- logger(DEBUG_TRAFFIC, LOG_DEBUG, "Setting outgoing packet priority to %d", priority);
- if(setsockopt(listen_socket[n->sock].udp.fd, SOL_IP, IP_TOS, &priority, sizeof(priority))) /* SO_PRIORITY doesn't seem to work */
- logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "setsockopt", sockstrerror(sockerrno));
+ if(!sa) {
+ choose_udp_address(n, &sa, &sock);
}
+
+ if(priorityinheritance && origpriority != listen_socket[sock].priority) {
+ listen_socket[sock].priority = origpriority;
+
+ switch(sa->sa.sa_family) {
+#if defined(IP_TOS)
+
+ case AF_INET:
+ logger(DEBUG_TRAFFIC, LOG_DEBUG, "Setting IPv4 outgoing packet priority to %d", origpriority);
+
+ if(setsockopt(listen_socket[sock].udp.fd, IPPROTO_IP, IP_TOS, (void *)&origpriority, sizeof(origpriority))) { /* SO_PRIORITY doesn't seem to work */
+ logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "setsockopt", sockstrerror(sockerrno));
+ }
+
+ break;
+#endif
+#if defined(IPV6_TCLASS)
+
+ case AF_INET6:
+ logger(DEBUG_TRAFFIC, LOG_DEBUG, "Setting IPv6 outgoing packet priority to %d", origpriority);
+
+ if(setsockopt(listen_socket[sock].udp.fd, IPPROTO_IPV6, IPV6_TCLASS, (void *)&origpriority, sizeof(origpriority))) { /* SO_PRIORITY doesn't seem to work */
+ logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "setsockopt", sockstrerror(sockerrno));
+ }
+
+ break;
#endif
- if(sendto(listen_socket[sock].udp.fd, SEQNO(inpkt), inpkt->len, 0, &sa->sa, SALEN(sa->sa)) < 0 && !sockwouldblock(sockerrno)) {
+ default:
+ break;
+ }
+ }
+
+ if(sendto(listen_socket[sock].udp.fd, (void *)SEQNO(inpkt), inpkt->len, 0, &sa->sa, SALEN(sa->sa)) < 0 && !sockwouldblock(sockerrno)) {
if(sockmsgsize(sockerrno)) {
- if(n->maxmtu >= origlen)
+ if(n->maxmtu >= origlen) {
n->maxmtu = origlen - 1;
- if(n->mtu >= origlen)
+ }
+
+ if(n->mtu >= origlen) {
n->mtu = origlen - 1;
+ }
+
try_fix_mtu(n);
- } else
+ } else {
logger(DEBUG_TRAFFIC, LOG_WARNING, "Error sending packet to %s (%s): %s", n->name, n->hostname, sockstrerror(sockerrno));
+ }
}
end:
#endif
}
-static bool send_sptps_data_priv(node_t *to, node_t *from, int type, const void *data, size_t len) {
+bool send_sptps_data(node_t *to, node_t *from, int type, const void *data, size_t len) {
node_t *relay = (to->via != myself && (type == PKT_PROBE || (len - SPTPS_DATAGRAM_OVERHEAD) <= to->via->minmtu)) ? to->via : to->nexthop;
bool direct = from == myself && to == relay;
bool relay_supported = (relay->options >> 24) >= 4;
bool tcponly = (myself->options | relay->options) & OPTION_TCPONLY;
- /* Send it via TCP if it is a handshake packet, TCPOnly is in use, this is a relay packet that the other node cannot understand, or this packet is larger than the MTU.
- TODO: When relaying, the original sender does not know the end-to-end PMTU (it only knows the PMTU of the first hop).
- This can lead to scenarios where large packets are sent over UDP to relay, but then relay has no choice but fall back to TCP. */
+ /* Send it via TCP if it is a handshake packet, TCPOnly is in use, this is a relay packet that the other node cannot understand, or this packet is larger than the MTU. */
if(type == SPTPS_HANDSHAKE || tcponly || (!direct && !relay_supported) || (type != PKT_PROBE && (len - SPTPS_DATAGRAM_OVERHEAD) > relay->minmtu)) {
+ if(type != SPTPS_HANDSHAKE && (to->nexthop->connection->options >> 24) >= 7) {
+ char buf[len + sizeof(to->id) + sizeof(from->id)];
+ char *buf_ptr = buf;
+ memcpy(buf_ptr, &to->id, sizeof(to->id));
+ buf_ptr += sizeof(to->id);
+ memcpy(buf_ptr, &from->id, sizeof(from->id));
+ buf_ptr += sizeof(from->id);
+ memcpy(buf_ptr, data, len);
+ logger(DEBUG_TRAFFIC, LOG_INFO, "Sending packet from %s (%s) to %s (%s) via %s (%s) (TCP)", from->name, from->hostname, to->name, to->hostname, to->nexthop->name, to->nexthop->hostname);
+ return send_sptps_tcppacket(to->nexthop->connection, buf, sizeof(buf));
+ }
+
char buf[len * 4 / 3 + 5];
b64encode(data, buf, len);
- /* If no valid key is known yet, send the packets using ANS_KEY requests,
- to ensure we get to learn the reflexive UDP address. */
- if(from == myself && !to->status.validkey) {
+
+ /* If this is a handshake packet, use ANS_KEY instead of REQ_KEY, for two reasons:
+ - We don't want intermediate nodes to switch to UDP to relay these packets;
+ - ANS_KEY allows us to learn the reflexive UDP address. */
+ if(type == SPTPS_HANDSHAKE) {
to->incompression = myself->incompression;
return send_request(to->nexthop->connection, "%d %s %s %s -1 -1 -1 %d", ANS_KEY, from->name, to->name, buf, to->incompression);
} else {
- return send_request(to->nexthop->connection, "%d %s %s %d %s", REQ_KEY, from->name, to->name, REQ_SPTPS, buf);
+ return send_request(to->nexthop->connection, "%d %s %s %d %s", REQ_KEY, from->name, to->name, SPTPS_PACKET, buf);
}
}
size_t overhead = 0;
- if(relay_supported) overhead += sizeof to->id + sizeof from->id;
- char buf[len + overhead]; char* buf_ptr = buf;
+
+ if(relay_supported) {
+ overhead += sizeof(to->id) + sizeof(from->id);
+ }
+
+ char buf[len + overhead];
+ char *buf_ptr = buf;
+
if(relay_supported) {
if(direct) {
/* Inform the recipient that this packet was sent directly. */
- node_id_t nullid = {};
- memcpy(buf_ptr, &nullid, sizeof nullid); buf_ptr += sizeof nullid;
+ node_id_t nullid = {0};
+ memcpy(buf_ptr, &nullid, sizeof(nullid));
+ buf_ptr += sizeof(nullid);
} else {
- memcpy(buf_ptr, &to->id, sizeof to->id); buf_ptr += sizeof to->id;
+ memcpy(buf_ptr, &to->id, sizeof(to->id));
+ buf_ptr += sizeof(to->id);
}
- memcpy(buf_ptr, &from->id, sizeof from->id); buf_ptr += sizeof from->id;
+
+ memcpy(buf_ptr, &from->id, sizeof(from->id));
+ buf_ptr += sizeof(from->id);
}
+
/* TODO: if this copy turns out to be a performance concern, change sptps_send_record() to add some "pre-padding" to the buffer and use that instead */
- memcpy(buf_ptr, data, len); buf_ptr += len;
+ memcpy(buf_ptr, data, len);
+ buf_ptr += len;
const sockaddr_t *sa = NULL;
int sock;
- if(relay->status.send_locally)
+
+ if(relay->status.send_locally) {
choose_local_address(relay, &sa, &sock);
- if(!sa)
+ }
+
+ if(!sa) {
choose_udp_address(relay, &sa, &sock);
- logger(DEBUG_TRAFFIC, LOG_INFO, "Sending packet from %s (%s) to %s (%s) via %s (%s)", from->name, from->hostname, to->name, to->hostname, relay->name, relay->hostname);
+ }
+
+ logger(DEBUG_TRAFFIC, LOG_INFO, "Sending packet from %s (%s) to %s (%s) via %s (%s) (UDP)", from->name, from->hostname, to->name, to->hostname, relay->name, relay->hostname);
+
if(sendto(listen_socket[sock].udp.fd, buf, buf_ptr - buf, 0, &sa->sa, SALEN(sa->sa)) < 0 && !sockwouldblock(sockerrno)) {
if(sockmsgsize(sockerrno)) {
// Compensate for SPTPS overhead
len -= SPTPS_DATAGRAM_OVERHEAD;
- if(relay->maxmtu >= len)
+
+ if(relay->maxmtu >= len) {
relay->maxmtu = len - 1;
- if(relay->mtu >= len)
+ }
+
+ if(relay->mtu >= len) {
relay->mtu = len - 1;
+ }
+
try_fix_mtu(relay);
} else {
logger(DEBUG_TRAFFIC, LOG_WARNING, "Error sending UDP SPTPS packet to %s (%s): %s", relay->name, relay->hostname, sockstrerror(sockerrno));
return true;
}
-bool send_sptps_data(void *handle, uint8_t type, const void *data, size_t len) {
- return send_sptps_data_priv(handle, myself, type, data, len);
-}
-
bool receive_sptps_record(void *handle, uint8_t type, const void *data, uint16_t len) {
node_t *from = handle;
if(!from->status.validkey) {
from->status.validkey = true;
from->status.waitingforkey = false;
- logger(DEBUG_META, LOG_INFO, "SPTPS key exchange with %s (%s) succesful", from->name, from->hostname);
+ logger(DEBUG_META, LOG_INFO, "SPTPS key exchange with %s (%s) successful", from->name, from->hostname);
}
+
return true;
}
vpn_packet_t inpkt;
inpkt.offset = DEFAULT_PACKET_OFFSET;
+ inpkt.priority = 0;
if(type == PKT_PROBE) {
+ if(!from->status.udppacket) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Got SPTPS PROBE packet from %s (%s) via TCP", from->name, from->hostname);
+ return false;
+ }
+
inpkt.len = len;
memcpy(DATA(&inpkt), data, len);
+
+ if(inpkt.len > from->maxrecentlen) {
+ from->maxrecentlen = inpkt.len;
+ }
+
udp_probe_h(from, &inpkt, len);
return true;
}
}
int offset = (type & PKT_MAC) ? 0 : 14;
+
if(type & PKT_COMPRESSED) {
length_t ulen = uncompress_packet(DATA(&inpkt) + offset, (const uint8_t *)data, len, from->incompression);
- if(ulen < 0) {
+
+ if(!ulen) {
return false;
} else {
inpkt.len = ulen + offset;
}
- if(inpkt.len > MAXSIZE)
+
+ if(inpkt.len > MAXSIZE) {
abort();
+ }
} else {
memcpy(DATA(&inpkt) + offset, data, len);
inpkt.len = len + offset;
/* Generate the Ethernet packet type if necessary */
if(offset) {
switch(DATA(&inpkt)[14] >> 4) {
- case 4:
- DATA(&inpkt)[12] = 0x08;
- DATA(&inpkt)[13] = 0x00;
- break;
- case 6:
- DATA(&inpkt)[12] = 0x86;
- DATA(&inpkt)[13] = 0xDD;
- break;
- default:
- logger(DEBUG_TRAFFIC, LOG_ERR,
- "Unknown IP version %d while reading packet from %s (%s)",
- DATA(&inpkt)[14] >> 4, from->name, from->hostname);
- return false;
+ case 4:
+ DATA(&inpkt)[12] = 0x08;
+ DATA(&inpkt)[13] = 0x00;
+ break;
+
+ case 6:
+ DATA(&inpkt)[12] = 0x86;
+ DATA(&inpkt)[13] = 0xDD;
+ break;
+
+ default:
+ logger(DEBUG_TRAFFIC, LOG_ERR,
+ "Unknown IP version %d while reading packet from %s (%s)",
+ DATA(&inpkt)[14] >> 4, from->name, from->hostname);
+ return false;
}
}
+ if(from->status.udppacket && inpkt.len > from->maxrecentlen) {
+ from->maxrecentlen = inpkt.len;
+ }
+
receive_packet(from, &inpkt);
return true;
}
// This function tries to get SPTPS keys, if they aren't already known.
// This function makes no guarantees - it is up to the caller to check the node's state to figure out if the keys are available.
static void try_sptps(node_t *n) {
- if(n->status.validkey)
+ if(n->status.validkey) {
return;
+ }
logger(DEBUG_TRAFFIC, LOG_INFO, "No valid key known yet for %s (%s)", n->name, n->hostname);
- if(!n->status.waitingforkey)
+ if(!n->status.waitingforkey) {
send_req_key(n);
- else if(n->last_req_key + 10 < now.tv_sec) {
+ } else if(n->last_req_key + 10 < now.tv_sec) {
logger(DEBUG_ALWAYS, LOG_DEBUG, "No key from %s after 10 seconds, restarting SPTPS", n->name);
sptps_stop(&n->sptps);
n->status.waitingforkey = false;
// This function tries to establish a UDP tunnel to a node so that packets can be sent.
// If a tunnel is already established, it makes sure it stays up.
// This function makes no guarantees - it is up to the caller to check the node's state to figure out if UDP is usable.
-static void try_udp(node_t* n) {
- if(!udp_discovery)
+static void try_udp(node_t *n) {
+ if(!udp_discovery) {
return;
+ }
+
+ /* Send gratuitous probe replies to 1.1 nodes. */
+
+ if((n->options >> 24) >= 3 && n->status.udp_confirmed) {
+ struct timeval ping_tx_elapsed;
+ timersub(&now, &n->udp_reply_sent, &ping_tx_elapsed);
+
+ if(ping_tx_elapsed.tv_sec >= udp_discovery_keepalive_interval - 1) {
+ n->udp_reply_sent = now;
+
+ if(n->maxrecentlen) {
+ vpn_packet_t pkt;
+ pkt.len = n->maxrecentlen;
+ pkt.offset = DEFAULT_PACKET_OFFSET;
+ memset(DATA(&pkt), 0, 14);
+ randomize(DATA(&pkt) + 14, MIN_PROBE_SIZE - 14);
+ send_udp_probe_reply(n, &pkt, pkt.len);
+ n->maxrecentlen = 0;
+ }
+ }
+ }
+
+ /* Probe request */
- struct timeval now;
- gettimeofday(&now, NULL);
struct timeval ping_tx_elapsed;
timersub(&now, &n->udp_ping_sent, &ping_tx_elapsed);
- if(ping_tx_elapsed.tv_sec >= udp_discovery_interval) {
- send_udp_probe_packet(n, MAX(n->minmtu, 16));
- n->udp_ping_sent = now;
+ int interval = n->status.udp_confirmed ? udp_discovery_keepalive_interval : udp_discovery_interval;
+
+ if(ping_tx_elapsed.tv_sec >= interval) {
+ gettimeofday(&now, NULL);
+ n->udp_ping_sent = now; // a probe in flight
+ send_udp_probe_packet(n, MIN_PROBE_SIZE);
if(localdiscovery && !n->status.udp_confirmed && n->prevedge) {
n->status.send_locally = true;
- send_udp_probe_packet(n, 16);
+ send_udp_probe_packet(n, MIN_PROBE_SIZE);
n->status.send_locally = false;
}
}
const sockaddr_t *sa = NULL;
int sockindex;
choose_udp_address(n, &sa, &sockindex);
- if(!sa)
+
+ if(!sa) {
return MTU;
+ }
sock = socket(sa->sa.sa_family, SOCK_DGRAM, IPPROTO_UDP);
+
if(sock < 0) {
logger(DEBUG_TRAFFIC, LOG_ERR, "Creating MTU assessment socket for %s (%s) failed: %s", n->name, n->hostname, sockstrerror(sockerrno));
return MTU;
}
int ip_mtu;
- socklen_t ip_mtu_len = sizeof ip_mtu;
+ socklen_t ip_mtu_len = sizeof(ip_mtu);
+
if(getsockopt(sock, IPPROTO_IP, IP_MTU, &ip_mtu, &ip_mtu_len)) {
logger(DEBUG_TRAFFIC, LOG_ERR, "getsockopt(IP_MTU) on %s (%s) failed: %s", n->name, n->hostname, sockstrerror(sockerrno));
close(sock);
length_t mtu = ip_mtu;
mtu -= (sa->sa.sa_family == AF_INET6) ? sizeof(struct ip6_hdr) : sizeof(struct ip);
mtu -= 8; /* UDP */
+
if(n->status.sptps) {
mtu -= SPTPS_DATAGRAM_OVERHEAD;
- if((n->options >> 24) >= 4)
+
+ if((n->options >> 24) >= 4) {
mtu -= sizeof(node_id_t) + sizeof(node_id_t);
+ }
+
+#ifndef DISABLE_LEGACY
+ } else {
+ mtu -= digest_length(n->outdigest);
+
+ /* Now it's tricky. We use CBC mode, so the length of the
+ encrypted payload must be a multiple of the blocksize. The
+ sequence number is also part of the encrypted payload, so we
+ must account for it after correcting for the blocksize.
+ Furthermore, the padding in the last block must be at least
+ 1 byte. */
+
+ length_t blocksize = cipher_blocksize(n->outcipher);
+
+ if(blocksize > 1) {
+ mtu /= blocksize;
+ mtu *= blocksize;
+ mtu--;
+ }
+
+ mtu -= 4; // seqno
+#endif
}
- if (mtu < 512) {
+ if(mtu < 512) {
logger(DEBUG_TRAFFIC, LOG_ERR, "getsockopt(IP_MTU) on %s (%s) returned absurdly small value: %d", n->name, n->hostname, ip_mtu);
return MTU;
}
- if (mtu > MTU)
+
+ if(mtu > MTU) {
return MTU;
+ }
logger(DEBUG_TRAFFIC, LOG_INFO, "Using system-provided maximum tinc MTU for %s (%s): %hd", n->name, n->hostname, mtu);
return mtu;
#else
-
+ (void)n;
return MTU;
-
#endif
}
-// This function tries to determines the MTU of a node.
-// By calling this function repeatedly, n->minmtu will be progressively increased, and at some point, n->mtu will be fixed to n->minmtu.
-// If the MTU is already fixed, this function checks if it can be increased.
+/* This function tries to determines the MTU of a node.
+ By calling this function repeatedly, n->minmtu will be progressively
+ increased, and at some point, n->mtu will be fixed to n->minmtu. If the MTU
+ is already fixed, this function checks if it can be increased.
+*/
+
static void try_mtu(node_t *n) {
- if(!(n->options & OPTION_PMTU_DISCOVERY))
+ if(!(n->options & OPTION_PMTU_DISCOVERY)) {
return;
+ }
if(udp_discovery && !n->status.udp_confirmed) {
+ n->maxrecentlen = 0;
n->mtuprobes = 0;
n->minmtu = 0;
n->maxmtu = MTU;
/* mtuprobes == 0..19: initial discovery, send bursts with 1 second interval, mtuprobes++
mtuprobes == 20: fix MTU, and go to -1
- mtuprobes == -1: send one >maxmtu probe every pingtimeout */
+ mtuprobes == -1: send one maxmtu and one maxmtu+1 probe every pinginterval
+ mtuprobes ==-2..-3: send one maxmtu probe every second
+ mtuprobes == -4: maxmtu no longer valid, reset minmtu and maxmtu and go to 0 */
- struct timeval now;
- gettimeofday(&now, NULL);
struct timeval elapsed;
- timersub(&now, &n->probe_sent_time, &elapsed);
+ timersub(&now, &n->mtu_ping_sent, &elapsed);
+
if(n->mtuprobes >= 0) {
- if(n->mtuprobes != 0 && elapsed.tv_sec == 0 && elapsed.tv_usec < 333333)
+ if(n->mtuprobes != 0 && elapsed.tv_sec == 0 && elapsed.tv_usec < 333333) {
return;
+ }
} else {
- if(elapsed.tv_sec < pingtimeout)
- return;
+ if(n->mtuprobes < -1) {
+ if(elapsed.tv_sec < 1) {
+ return;
+ }
+ } else {
+ if(elapsed.tv_sec < pinginterval) {
+ return;
+ }
+ }
}
+ n->mtu_ping_sent = now;
+
try_fix_mtu(n);
- int timeout;
+ if(n->mtuprobes < -3) {
+ /* We lost three MTU probes, restart discovery */
+ logger(DEBUG_TRAFFIC, LOG_INFO, "Decrease in PMTU to %s (%s) detected, restarting PMTU discovery", n->name, n->hostname);
+ n->mtuprobes = 0;
+ n->minmtu = 0;
+ }
+
if(n->mtuprobes < 0) {
- /* After the initial discovery, we only send one >maxmtu probe
- to detect PMTU increases. */
- if(n->maxmtu + 1 < MTU)
+ /* After the initial discovery, we only send one maxmtu and one
+ maxmtu+1 probe to detect PMTU increases. */
+ send_udp_probe_packet(n, n->maxmtu);
+
+ if(n->mtuprobes == -1 && n->maxmtu + 1 < MTU) {
send_udp_probe_packet(n, n->maxmtu + 1);
+ }
+
+ n->mtuprobes--;
} else {
/* Before initial discovery begins, set maxmtu to the most likely value.
If it's underestimated, we will correct it after initial discovery. */
- if(n->mtuprobes == 0)
+ if(n->mtuprobes == 0) {
n->maxmtu = choose_initial_maxmtu(n);
+ }
- /* Decreasing the number of probes per cycle might make the algorithm react faster to lost packets,
- but it will typically increase convergence time in the no-loss case. */
- const length_t probes_per_cycle = 8;
-
- /* This magic value was determined using math simulations.
- It will result in a 1329-byte first probe, followed (if there was a reply) by a 1407-byte probe.
- Since 1407 is just below the range of tinc MTUs over typical networks,
- this fine-tuning allows tinc to cover a lot of ground very quickly.
- This fine-tuning is only valid for maxmtu = MTU; if maxmtu is smaller,
- then it's better to use a multiplier of 1. Indeed, this leads to an interesting scenario
- if choose_initial_maxmtu() returns the actual MTU value - it will get confirmed with one single probe. */
- const float multiplier = (n->maxmtu == MTU) ? 0.97 : 1;
-
- const float cycle_position = probes_per_cycle - (n->mtuprobes % probes_per_cycle) - 1;
- const length_t minmtu = MAX(n->minmtu, 512);
- const float interval = n->maxmtu - minmtu;
-
- /* The core of the discovery algorithm is this exponential.
- It produces very large probes early in the cycle, and then it very quickly decreases the probe size.
- This reflects the fact that in the most difficult cases, we don't get any feedback for probes that
- are too large, and therefore we need to concentrate on small offsets so that we can quickly converge
- on the precise MTU as we are approaching it.
- The last probe of the cycle is always 1 byte in size - this is to make sure we'll get at least one
- reply per cycle so that we can make progress. */
- const length_t offset = powf(interval, multiplier * cycle_position / (probes_per_cycle - 1));
-
- send_udp_probe_packet(n, minmtu + offset);
- if(n->mtuprobes >= 0)
+ for(;;) {
+ /* Decreasing the number of probes per cycle might make the algorithm react faster to lost packets,
+ but it will typically increase convergence time in the no-loss case. */
+ const length_t probes_per_cycle = 8;
+
+ /* This magic value was determined using math simulations.
+ It will result in a 1329-byte first probe, followed (if there was a reply) by a 1407-byte probe.
+ Since 1407 is just below the range of tinc MTUs over typical networks,
+ this fine-tuning allows tinc to cover a lot of ground very quickly.
+ This fine-tuning is only valid for maxmtu = MTU; if maxmtu is smaller,
+ then it's better to use a multiplier of 1. Indeed, this leads to an interesting scenario
+ if choose_initial_maxmtu() returns the actual MTU value - it will get confirmed with one single probe. */
+ const float multiplier = (n->maxmtu == MTU) ? 0.97 : 1;
+
+ const float cycle_position = probes_per_cycle - (n->mtuprobes % probes_per_cycle) - 1;
+ const length_t minmtu = MAX(n->minmtu, 512);
+ const float interval = n->maxmtu - minmtu;
+
+ /* The core of the discovery algorithm is this exponential.
+ It produces very large probes early in the cycle, and then it very quickly decreases the probe size.
+ This reflects the fact that in the most difficult cases, we don't get any feedback for probes that
+ are too large, and therefore we need to concentrate on small offsets so that we can quickly converge
+ on the precise MTU as we are approaching it.
+ The last probe of the cycle is always 1 byte in size - this is to make sure we'll get at least one
+ reply per cycle so that we can make progress. */
+ const length_t offset = powf(interval, multiplier * cycle_position / (probes_per_cycle - 1));
+
+ length_t maxmtu = n->maxmtu;
+ send_udp_probe_packet(n, minmtu + offset);
+
+ /* If maxmtu changed, it means the probe was rejected by the system because it was too large.
+ In that case, we recalculate with the new maxmtu and try again. */
+ if(n->mtuprobes < 0 || maxmtu == n->maxmtu) {
+ break;
+ }
+ }
+
+ if(n->mtuprobes >= 0) {
n->mtuprobes++;
+ }
}
+}
- n->probe_counter = 0;
- n->probe_sent_time = now;
- n->probe_time = now;
+/* These functions try to establish a tunnel to a node (or its relay) so that
+ packets can be sent (e.g. exchange keys).
+ If a tunnel is already established, it tries to improve it (e.g. by trying
+ to establish a UDP tunnel instead of TCP). This function makes no
+ guarantees - it is up to the caller to check the node's state to figure out
+ if TCP and/or UDP is usable. By calling this function repeatedly, the
+ tunnel is gradually improved until we hit the wall imposed by the underlying
+ network environment. It is recommended to call this function every time a
+ packet is sent (or intended to be sent) to a node, so that the tunnel keeps
+ improving as packets flow, and then gracefully downgrades itself as it goes
+ idle.
+*/
- /* Calculate the packet loss of incoming traffic by comparing the rate of
- packets received to the rate with which the sequence number has increased.
- TODO: this is unrelated to PMTU discovery - it should be moved elsewhere.
- */
+static void try_tx_sptps(node_t *n, bool mtu) {
+ /* If n is a TCP-only neighbor, we'll only use "cleartext" PACKET
+ messages anyway, so there's no need for SPTPS at all. */
- if(n->received > n->prev_received)
- n->packetloss = 1.0 - (n->received - n->prev_received) / (float)(n->received_seqno - n->prev_received_seqno);
- else
- n->packetloss = n->received_seqno <= n->prev_received_seqno;
+ if(n->connection && ((myself->options | n->options) & OPTION_TCPONLY)) {
+ return;
+ }
- n->prev_received_seqno = n->received_seqno;
- n->prev_received = n->received;
-}
+ /* Otherwise, try to do SPTPS authentication with n if necessary. */
-// This function tries to establish a tunnel to a node (or its relay) so that packets can be sent (e.g. get SPTPS keys).
-// If a tunnel is already established, it tries to improve it (e.g. by trying to establish a UDP tunnel instead of TCP).
-// This function makes no guarantees - it is up to the caller to check the node's state to figure out if TCP and/or UDP is usable.
-// By calling this function repeatedly, the tunnel is gradually improved until we hit the wall imposed by the underlying network environment.
-// It is recommended to call this function every time a packet is sent (or intended to be sent) to a node,
-// so that the tunnel keeps improving as packets flow, and then gracefully downgrades itself as it goes idle.
-static void try_tx(node_t *n) {
- /* If n is a TCP-only neighbor, we'll only use "cleartext" PACKET
- messages anyway, so there's no need for SPTPS at all. Otherwise, get the keys. */
- if(n->status.sptps && !(n->connection && ((myself->options | n->options) & OPTION_TCPONLY))) {
- try_sptps(n);
- if (!n->status.validkey)
+ try_sptps(n);
+
+ /* Do we need to statically relay packets? */
+
+ node_t *via = (n->via == myself) ? n->nexthop : n->via;
+
+ /* If we do have a static relay, try everything with that one instead, if it supports relaying. */
+
+ if(via != n) {
+ if((via->options >> 24) < 4) {
return;
+ }
+
+ try_tx(via, mtu);
+ return;
}
- node_t *via = (n->via == myself) ? n->nexthop : n->via;
-
- if((myself->options | via->options) & OPTION_TCPONLY)
+ /* Otherwise, try to establish UDP connectivity. */
+
+ try_udp(n);
+
+ if(mtu) {
+ try_mtu(n);
+ }
+
+ /* If we don't have UDP connectivity (yet), we need to use a dynamic relay (nexthop)
+ while we try to establish direct connectivity. */
+
+ if(!n->status.udp_confirmed && n != n->nexthop && (n->nexthop->options >> 24) >= 4) {
+ try_tx(n->nexthop, mtu);
+ }
+}
+
+static void try_tx_legacy(node_t *n, bool mtu) {
+ /* Does he have our key? If not, send one. */
+
+ if(!n->status.validkey_in) {
+ send_ans_key(n);
+ }
+
+ /* Check if we already have a key, or request one. */
+
+ if(!n->status.validkey) {
+ if(n->last_req_key + 10 <= now.tv_sec) {
+ send_req_key(n);
+ n->last_req_key = now.tv_sec;
+ }
+
return;
+ }
+
+ try_udp(n);
+
+ if(mtu) {
+ try_mtu(n);
+ }
+}
- if(!n->status.sptps && !via->status.validkey && via->last_req_key + 10 <= now.tv_sec) {
- send_req_key(via);
- via->last_req_key = now.tv_sec;
- } else if(via == n || !n->status.sptps || (via->options >> 24) >= 4) {
- try_udp(via);
- try_mtu(via);
+void try_tx(node_t *n, bool mtu) {
+ if(!n->status.reachable) {
+ return;
}
- /* If we don't know how to reach "via" yet, then try to reach it through a relay. */
- if(n->status.sptps && !via->status.udp_confirmed && via->nexthop != via && (via->nexthop->options >> 24) >= 4)
- try_tx(via->nexthop);
+ if(n->status.sptps) {
+ try_tx_sptps(n, mtu);
+ } else {
+ try_tx_legacy(n, mtu);
+ }
}
-/*
- send a packet to the given vpn ip.
-*/
void send_packet(node_t *n, vpn_packet_t *packet) {
- node_t *via;
+ // If it's for myself, write it to the tun/tap device.
if(n == myself) {
- if(overwrite_mac)
- memcpy(DATA(packet), mymac.x, ETH_ALEN);
+ if(overwrite_mac) {
+ memcpy(DATA(packet), mymac.x, ETH_ALEN);
+ // Use an arbitrary fake source address.
+ memcpy(DATA(packet) + ETH_ALEN, DATA(packet), ETH_ALEN);
+ DATA(packet)[ETH_ALEN * 2 - 1] ^= 0xFF;
+ }
+
n->out_packets++;
n->out_bytes += packet->len;
devops.write(packet);
return;
}
- logger(DEBUG_TRAFFIC, LOG_ERR, "Sending packet of %d bytes to %s (%s)",
- packet->len, n->name, n->hostname);
+ logger(DEBUG_TRAFFIC, LOG_ERR, "Sending packet of %d bytes to %s (%s)", packet->len, n->name, n->hostname);
+
+ // If the node is not reachable, drop it.
if(!n->status.reachable) {
- logger(DEBUG_TRAFFIC, LOG_INFO, "Node %s (%s) is not reachable",
- n->name, n->hostname);
+ logger(DEBUG_TRAFFIC, LOG_INFO, "Node %s (%s) is not reachable", n->name, n->hostname);
return;
}
+ // Keep track of packet statistics.
+
n->out_packets++;
n->out_bytes += packet->len;
+ // Check if it should be sent as an SPTPS packet.
+
if(n->status.sptps) {
send_sptps_packet(n, packet);
- goto end;
+ try_tx(n, true);
+ return;
}
- via = (packet->priority == -1 || n->via == myself) ? n->nexthop : n->via;
+ // Determine which node to actually send it to.
- if(via != n)
- logger(DEBUG_TRAFFIC, LOG_INFO, "Sending packet to %s via %s (%s)",
- n->name, via->name, n->via->hostname);
+ node_t *via = (packet->priority == -1 || n->via == myself) ? n->nexthop : n->via;
+
+ if(via != n) {
+ logger(DEBUG_TRAFFIC, LOG_INFO, "Sending packet to %s via %s (%s)", n->name, via->name, n->via->hostname);
+ }
+
+ // Try to send via UDP, unless TCP is forced.
if(packet->priority == -1 || ((myself->options | via->options) & OPTION_TCPONLY)) {
- if(!send_tcppacket(via->connection, packet))
+ if(!send_tcppacket(via->connection, packet)) {
terminate_connection(via->connection, true);
- } else
- send_udppacket(via, packet);
+ }
-end:
- /* Try to improve the tunnel.
- Note that we do this *after* we send the packet because sending actual packets take priority
- with regard to the send buffer space and latency. */
- try_tx(n);
-}
+ return;
+ }
-/* Broadcast a packet using the minimum spanning tree */
+ send_udppacket(via, packet);
+ try_tx(via, true);
+}
void broadcast_packet(const node_t *from, vpn_packet_t *packet) {
// Always give ourself a copy of the packet.
- if(from != myself)
+ if(from != myself) {
send_packet(myself, packet);
+ }
// In TunnelServer mode, do not forward broadcast packets.
// The MST might not be valid and create loops.
- if(tunnelserver || broadcast_mode == BMODE_NONE)
+ if(tunnelserver || broadcast_mode == BMODE_NONE) {
return;
+ }
logger(DEBUG_TRAFFIC, LOG_INFO, "Broadcasting packet of %d bytes from %s (%s)",
- packet->len, from->name, from->hostname);
+ packet->len, from->name, from->hostname);
switch(broadcast_mode) {
- // In MST mode, broadcast packets travel via the Minimum Spanning Tree.
- // This guarantees all nodes receive the broadcast packet, and
- // usually distributes the sending of broadcast packets over all nodes.
- case BMODE_MST:
- for list_each(connection_t, c, connection_list)
- if(c->edge && c->status.mst && c != from->nexthop->connection)
- send_packet(c->node, packet);
- break;
+ // In MST mode, broadcast packets travel via the Minimum Spanning Tree.
+ // This guarantees all nodes receive the broadcast packet, and
+ // usually distributes the sending of broadcast packets over all nodes.
+ case BMODE_MST:
+ for list_each(connection_t, c, connection_list)
+ if(c->edge && c->status.mst && c != from->nexthop->connection) {
+ send_packet(c->node, packet);
+ }
- // In direct mode, we send copies to each node we know of.
- // However, this only reaches nodes that can be reached in a single hop.
- // We don't have enough information to forward broadcast packets in this case.
- case BMODE_DIRECT:
- if(from != myself)
- break;
+ break;
- for splay_each(node_t, n, node_tree)
- if(n->status.reachable && n != myself && ((n->via == myself && n->nexthop == n) || n->via == n))
- send_packet(n, packet);
+ // In direct mode, we send copies to each node we know of.
+ // However, this only reaches nodes that can be reached in a single hop.
+ // We don't have enough information to forward broadcast packets in this case.
+ case BMODE_DIRECT:
+ if(from != myself) {
break;
+ }
- default:
- break;
+ for splay_each(node_t, n, node_tree)
+ if(n->status.reachable && n != myself && ((n->via == myself && n->nexthop == n) || n->via == n)) {
+ send_packet(n, packet);
+ }
+
+ break;
+
+ default:
+ break;
}
}
+/* We got a packet from some IP address, but we don't know who sent it. Try to
+ verify the message authentication code against all active session keys.
+ Since this is actually an expensive operation, we only do a full check once
+ a minute, the rest of the time we only check against nodes for which we know
+ an IP address that matches the one from the packet. */
+
static node_t *try_harder(const sockaddr_t *from, const vpn_packet_t *pkt) {
- node_t *n = NULL;
+ node_t *match = NULL;
bool hard = false;
static time_t last_hard_try = 0;
- for splay_each(edge_t, e, edge_weight_tree) {
- if(!e->to->status.reachable || e->to == myself)
+ for splay_each(node_t, n, node_tree) {
+ if(!n->status.reachable || n == myself) {
continue;
+ }
+
+ if(!n->status.validkey_in && !(n->status.sptps && n->sptps.instate)) {
+ continue;
+ }
+
+ bool soft = false;
- if(sockaddrcmp_noport(from, &e->address)) {
- if(last_hard_try == now.tv_sec)
+ for splay_each(edge_t, e, n->edge_tree) {
+ if(!e->reverse) {
continue;
+ }
+
+ if(!sockaddrcmp_noport(from, &e->reverse->address)) {
+ soft = true;
+ break;
+ }
+ }
+
+ if(!soft) {
+ if(last_hard_try == now.tv_sec) {
+ continue;
+ }
+
hard = true;
}
- if(!try_mac(e->to, pkt))
+ if(!try_mac(n, pkt)) {
continue;
+ }
- n = e->to;
+ match = n;
break;
}
- if(hard)
+ if(hard) {
last_hard_try = now.tv_sec;
+ }
- last_hard_try = now.tv_sec;
- return n;
+ return match;
}
-void handle_incoming_vpn_data(void *data, int flags) {
- listen_socket_t *ls = data;
- vpn_packet_t pkt;
+static void handle_incoming_vpn_packet(listen_socket_t *ls, vpn_packet_t *pkt, sockaddr_t *addr) {
char *hostname;
- node_id_t nullid = {};
- sockaddr_t addr = {};
- socklen_t addrlen = sizeof addr;
+ node_id_t nullid = {0};
node_t *from, *to;
bool direct = false;
- pkt.offset = 0;
- int len = recvfrom(ls->udp.fd, DATA(&pkt), MAXSIZE, 0, &addr.sa, &addrlen);
-
- if(len <= 0 || len > MAXSIZE) {
- if(!sockwouldblock(sockerrno))
- logger(DEBUG_ALWAYS, LOG_ERR, "Receiving packet failed: %s", sockstrerror(sockerrno));
- return;
- }
-
- pkt.len = len;
-
- sockaddrunmap(&addr); /* Some braindead IPv6 implementations do stupid things. */
+ sockaddrunmap(addr); /* Some braindead IPv6 implementations do stupid things. */
// Try to figure out who sent this packet.
- node_t *n = lookup_node_udp(&addr);
+ node_t *n = lookup_node_udp(addr);
+
+ if(n && !n->status.udp_confirmed) {
+ n = NULL; // Don't believe it if we don't have confirmation yet.
+ }
if(!n) {
// It might be from a 1.1 node, which might have a source ID in the packet.
- pkt.offset = 2 * sizeof(node_id_t);
- from = lookup_node_id(SRCID(&pkt));
- if(from && !memcmp(DSTID(&pkt), &nullid, sizeof nullid) && from->status.sptps) {
- if(sptps_verify_datagram(&from->sptps, DATA(&pkt), pkt.len - 2 * sizeof(node_id_t)))
+ pkt->offset = 2 * sizeof(node_id_t);
+ from = lookup_node_id(SRCID(pkt));
+
+ if(from && !memcmp(DSTID(pkt), &nullid, sizeof(nullid)) && from->status.sptps) {
+ if(sptps_verify_datagram(&from->sptps, DATA(pkt), pkt->len - 2 * sizeof(node_id_t))) {
n = from;
- else
+ } else {
goto skip_harder;
+ }
}
}
if(!n) {
- pkt.offset = 0;
- n = try_harder(&addr, &pkt);
+ pkt->offset = 0;
+ n = try_harder(addr, pkt);
}
skip_harder:
+
if(!n) {
if(debug_level >= DEBUG_PROTOCOL) {
- hostname = sockaddr2hostname(&addr);
+ hostname = sockaddr2hostname(addr);
logger(DEBUG_PROTOCOL, LOG_WARNING, "Received UDP packet from unknown source %s", hostname);
free(hostname);
}
+
return;
}
+ pkt->offset = 0;
+
if(n->status.sptps) {
- pkt.offset = 2 * sizeof(node_id_t);
+ bool relay_enabled = (n->options >> 24) >= 4;
+
+ if(relay_enabled) {
+ pkt->offset = 2 * sizeof(node_id_t);
+ pkt->len -= pkt->offset;
+ }
- if(!memcmp(DSTID(&pkt), &nullid, sizeof nullid)) {
+ if(!memcmp(DSTID(pkt), &nullid, sizeof(nullid)) || !relay_enabled) {
direct = true;
from = n;
to = myself;
} else {
- from = lookup_node_id(SRCID(&pkt));
- to = lookup_node_id(DSTID(&pkt));
+ from = lookup_node_id(SRCID(pkt));
+ to = lookup_node_id(DSTID(pkt));
}
+
if(!from || !to) {
logger(DEBUG_PROTOCOL, LOG_WARNING, "Received UDP packet from %s (%s) with unknown source and/or destination ID", n->name, n->hostname);
return;
}
+ if(!to->status.reachable) {
+ /* This can happen in the form of a race condition
+ if the node just became unreachable. */
+ logger(DEBUG_TRAFFIC, LOG_WARNING, "Cannot relay packet from %s (%s) because the destination, %s (%s), is unreachable", from->name, from->hostname, to->name, to->hostname);
+ return;
+ }
+
+ /* The packet is supposed to come from the originator or its static relay
+ (i.e. with no dynamic relays in between).
+ If it did not, "help" the static relay by sending it UDP info.
+ Note that we only do this if we're the destination or the static relay;
+ otherwise every hop would initiate its own UDP info message, resulting in elevated chatter. */
+
+ if(n != from->via && to->via == myself) {
+ send_udp_info(myself, from);
+ }
+
+ /* If we're not the final recipient, relay the packet. */
+
if(to != myself) {
- send_sptps_data_priv(to, n, 0, DATA(&pkt), pkt.len - 2 * sizeof(node_id_t));
+ send_sptps_data(to, from, 0, DATA(pkt), pkt->len);
+ try_tx(to, true);
return;
}
} else {
from = n;
}
- pkt.offset = 0;
- if(!receive_udppacket(from, &pkt))
+ if(!receive_udppacket(from, pkt)) {
return;
+ }
n->sock = ls - listen_socket;
- if(direct && sockaddrcmp(&addr, &n->address))
- update_node_udp(n, &addr);
+
+ if(direct && sockaddrcmp(addr, &n->address)) {
+ update_node_udp(n, addr);
+ }
+
+ /* If the packet went through a relay, help the sender find the appropriate MTU
+ through the relay path. */
+
+ if(!direct) {
+ send_mtu_info(myself, n, MTU);
+ }
+}
+
+void handle_incoming_vpn_data(void *data, int flags) {
+ (void)data;
+ (void)flags;
+ listen_socket_t *ls = data;
+
+#ifdef HAVE_RECVMMSG
+#define MAX_MSG 64
+ static int num = MAX_MSG;
+ static vpn_packet_t pkt[MAX_MSG];
+ static sockaddr_t addr[MAX_MSG];
+ static struct mmsghdr msg[MAX_MSG];
+ static struct iovec iov[MAX_MSG];
+
+ for(int i = 0; i < num; i++) {
+ pkt[i].offset = 0;
+
+ iov[i] = (struct iovec) {
+ .iov_base = DATA(&pkt[i]),
+ .iov_len = MAXSIZE,
+ };
+
+ msg[i].msg_hdr = (struct msghdr) {
+ .msg_name = &addr[i].sa,
+ .msg_namelen = sizeof(addr)[i],
+ .msg_iov = &iov[i],
+ .msg_iovlen = 1,
+ };
+ }
+
+ num = recvmmsg(ls->udp.fd, msg, MAX_MSG, MSG_DONTWAIT, NULL);
+
+ if(num < 0) {
+ if(!sockwouldblock(sockerrno)) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Receiving packet failed: %s", sockstrerror(sockerrno));
+ }
+
+ return;
+ }
+
+ for(int i = 0; i < num; i++) {
+ pkt[i].len = msg[i].msg_len;
+
+ if(pkt[i].len <= 0 || pkt[i].len > MAXSIZE) {
+ continue;
+ }
+
+ handle_incoming_vpn_packet(ls, &pkt[i], &addr[i]);
+ }
+
+#else
+ vpn_packet_t pkt;
+ sockaddr_t addr = {0};
+ socklen_t addrlen = sizeof(addr);
+
+ pkt.offset = 0;
+ int len = recvfrom(ls->udp.fd, (void *)DATA(&pkt), MAXSIZE, 0, &addr.sa, &addrlen);
+
+ if(len <= 0 || (size_t)len > MAXSIZE) {
+ if(!sockwouldblock(sockerrno)) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Receiving packet failed: %s", sockstrerror(sockerrno));
+ }
+
+ return;
+ }
+
+ pkt.len = len;
+
+ handle_incoming_vpn_packet(ls, &pkt, &addr);
+#endif
}
void handle_device_data(void *data, int flags) {
+ (void)data;
+ (void)flags;
vpn_packet_t packet;
packet.offset = DEFAULT_PACKET_OFFSET;
packet.priority = 0;
+ static int errors = 0;
if(devops.read(&packet)) {
+ errors = 0;
myself->in_packets++;
myself->in_bytes += packet.len;
route(myself, &packet);
+ } else {
+ usleep(errors * 50000);
+ errors++;
+
+ if(errors > 10) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Too many errors from %s, exiting!", device);
+ event_exit();
+ }
}
}
projects / tinc / blobdiff