/*
net_packet.c -- Handles in- and outgoing VPN packets
Copyright (C) 1998-2005 Ivo Timmermans,
- 2000-2021 Guus Sliepen <guus@tinc-vpn.org>
+ 2000-2022 Guus Sliepen <guus@tinc-vpn.org>
2010 Timothy Redaelli <timothy@redaelli.eu>
2010 Brandon Black <blblack@gmail.com>
#ifdef HAVE_ZLIB
#define ZLIB_CONST
#include <zlib.h>
-#include <assert.h>
#endif
#include LZO1X_H
#endif
-#ifdef LZ4_H
-#include LZ4_H
+#ifdef HAVE_LZ4
+#include <lz4.h>
#endif
#include "address_cache.h"
#include "protocol.h"
#include "route.h"
#include "utils.h"
-
-#ifndef MAX
-#define MAX(a, b) ((a) > (b) ? (a) : (b))
-#endif
+#include "random.h"
/* 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
static char lzo_wrkmem[LZO1X_999_MEM_COMPRESS > LZO1X_1_MEM_COMPRESS ? LZO1X_999_MEM_COMPRESS : LZO1X_1_MEM_COMPRESS];
#endif
+#ifdef HAVE_LZ4
+
#ifdef HAVE_LZ4_BUILTIN
static LZ4_stream_t lz4_stream;
#else
static void *lz4_state = NULL;
-#endif /* HAVE_LZ4_BUILTIN */
+#endif // HAVE_LZ4_BUILTIN
+
+#endif // HAVE_LZ4
static void send_udppacket(node_t *, vpn_packet_t *);
}
}
+static void reduce_mtu(node_t *n, int mtu) {
+ if(mtu < MINMTU) {
+ mtu = MINMTU;
+ }
+
+ if(n->maxmtu > mtu) {
+ n->maxmtu = mtu;
+ }
+
+ if(n->mtu > mtu) {
+ n->mtu = mtu;
+ }
+
+ try_fix_mtu(n);
+}
+
static void udp_probe_timeout_handler(void *data) {
node_t *n = data;
n->address_cache = open_address_cache(n);
}
- reset_address_cache(n->address_cache, &n->address);
+ if(n->connection && n->connection->edge) {
+ reset_address_cache(n->address_cache);
+ add_recent_address(n->address_cache, &n->connection->edge->address);
+ }
}
// Reset the UDP ping timer.
#ifdef HAVE_LZO
static length_t compress_packet_lzo(uint8_t *dest, const uint8_t *source, length_t len, compression_level_t level) {
- assert(level == COMPRESS_LZO_LO || level == COMPRESS_LZO_HI);
-
lzo_uint lzolen = MAXSIZE;
int result;
So we pick a random edge and a random socket. */
unsigned int i = 0;
- unsigned int j = rand() % n->edge_tree.count;
+ unsigned int j = prng(n->edge_tree.count);
edge_t *candidate = NULL;
for splay_each(edge_t, e, &n->edge_tree) {
if(candidate) {
*sa = &candidate->address;
- *sock = rand() % listen_sockets;
+ *sock = prng(listen_sockets);
}
adapt_socket(*sa, sock);
/* Pick one of the edges from this node at random, then use its local address. */
unsigned int i = 0;
- unsigned int j = rand() % n->edge_tree.count;
+ unsigned int j = prng(n->edge_tree.count);
edge_t *candidate = NULL;
for splay_each(edge_t, e, &n->edge_tree) {
if(candidate && candidate->local_address.sa.sa_family) {
*sa = &candidate->local_address;
- *sock = rand() % listen_sockets;
+ *sock = prng(listen_sockets);
adapt_socket(*sa, sock);
}
}
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) {
- n->maxmtu = origlen - 1;
- }
-
- if(n->mtu >= origlen) {
- n->mtu = origlen - 1;
- }
-
- try_fix_mtu(n);
+ reduce_mtu(n, origlen - 1);
} else {
logger(DEBUG_TRAFFIC, LOG_WARNING, "Error sending packet to %s (%s): %s", n->name, n->hostname, sockstrerror(sockerrno));
}
}
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;
+ size_t origlen = len - SPTPS_DATAGRAM_OVERHEAD;
+ node_t *relay = (to->via != myself && (type == PKT_PROBE || origlen <= 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. */
- if(type == SPTPS_HANDSHAKE || tcponly || (!direct && !relay_supported) || (type != PKT_PROBE && (len - SPTPS_DATAGRAM_OVERHEAD) > relay->minmtu)) {
+ if(type == SPTPS_HANDSHAKE || tcponly || (!direct && !relay_supported) || (type != PKT_PROBE && origlen > relay->minmtu)) {
if(type != SPTPS_HANDSHAKE && (to->nexthop->connection->options >> 24) >= 7) {
- uint8_t buf[len + sizeof(to->id) + sizeof(from->id)];
+ const size_t buflen = len + sizeof(to->id) + sizeof(from->id);
+ uint8_t *buf = alloca(buflen);
uint8_t *buf_ptr = buf;
memcpy(buf_ptr, &to->id, sizeof(to->id));
buf_ptr += sizeof(to->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));
+ return send_sptps_tcppacket(to->nexthop->connection, buf, buflen);
}
- char buf[len * 4 / 3 + 5];
- b64encode(data, buf, len);
+ char *buf = alloca(B64_SIZE(len));
+ b64encode_tinc(data, buf, len);
/* 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;
overhead += sizeof(to->id) + sizeof(from->id);
}
- uint8_t buf[len + overhead];
- uint8_t *buf_ptr = buf;
+ char *buf = alloca(len + overhead);
+ char *buf_ptr = buf;
if(relay_supported) {
if(direct) {
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) {
- relay->maxmtu = len - 1;
- }
-
- if(relay->mtu >= len) {
- relay->mtu = len - 1;
- }
-
- try_fix_mtu(relay);
+ reduce_mtu(relay, (int)origlen - 1);
} else {
logger(DEBUG_TRAFFIC, LOG_WARNING, "Error sending UDP SPTPS packet to %s (%s): %s", relay->name, relay->hostname, sockstrerror(sockerrno));
return false;
vpn_packet_t packet;
if(len > sizeof(packet.data)) {
- logger(DEBUG_TRAFFIC, LOG_INFO, "Truncating probe length %zu to %s (%s)", len, n->name, n->hostname);
+ logger(DEBUG_TRAFFIC, LOG_INFO, "Truncating probe length %lu to %s (%s)", (unsigned long)len, n->name, n->hostname);
len = sizeof(packet.data);
}
+ len = MAX(len, MIN_PROBE_SIZE);
packet.offset = DEFAULT_PACKET_OFFSET;
memset(DATA(&packet), 0, 14);
randomize(DATA(&packet) + 14, len - 14);
packet.len = len;
packet.priority = 0;
- logger(DEBUG_TRAFFIC, LOG_INFO, "Sending UDP probe length %zu to %s (%s)", len, n->name, n->hostname);
+ logger(DEBUG_TRAFFIC, LOG_INFO, "Sending UDP probe length %lu to %s (%s)", (unsigned long)len, n->name, n->hostname);
send_udppacket(n, &packet);
}
if(connect(sock, &sa->sa, SALEN(sa->sa))) {
logger(DEBUG_TRAFFIC, LOG_ERR, "Connecting MTU assessment socket for %s (%s) failed: %s", n->name, n->hostname, sockstrerror(sockerrno));
- close(sock);
+ closesocket(sock);
return MTU;
}
int ip_mtu;
socklen_t ip_mtu_len = sizeof(ip_mtu);
- if(getsockopt(sock, IPPROTO_IP, IP_MTU, &ip_mtu, &ip_mtu_len)) {
+ if(getsockopt(sock, IPPROTO_IP, IP_MTU, (void *)&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);
+ closesocket(sock);
return MTU;
}
- close(sock);
+ closesocket(sock);
+
+ if(ip_mtu < MINMTU) {
+ logger(DEBUG_TRAFFIC, LOG_ERR, "getsockopt(IP_MTU) on %s (%s) returned absurdly small value: %d", n->name, n->hostname, ip_mtu);
+ return MTU;
+ }
/* getsockopt(IP_MTU) returns the MTU of the physical interface.
We need to remove various overheads to get to the tinc MTU. */
#endif
}
- 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) {
return MTU;
}
const float multiplier = (n->maxmtu == MTU) ? 0.97f : 1.0f;
const float cycle_position = (float) probes_per_cycle - (float)(n->mtuprobes % probes_per_cycle) - 1.0f;
- const length_t minmtu = MAX(n->minmtu, 512);
+ const length_t minmtu = MAX(n->minmtu, MINMTU);
const float interval = (float)(n->maxmtu - minmtu);
length_t offset = 0;
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. */
- offset = (length_t) powf(interval, multiplier * cycle_position / ((float) probes_per_cycle - 1.0f));
+ offset = lrintf(powf(interval, multiplier * cycle_position / (float)(probes_per_cycle - 1)));
}
length_t maxmtu = n->maxmtu;
break;
+ case BMODE_NONE:
default:
break;
}
myself->in_bytes += packet.len;
route(myself, &packet);
} else {
- usleep(errors * 50000);
+ sleep_millis(errors * 50);
errors++;
if(errors > 10) {
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