/*
net_packet.c -- Handles in- and outgoing VPN packets
Copyright (C) 1998-2005 Ivo Timmermans,
- 2000-2017 Guus Sliepen <guus@tinc-vpn.org>
+ 2000-2021 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
#ifdef HAVE_LZO
#include LZO1X_H
#endif
+#ifdef LZ4_H
+#include LZ4_H
+#endif
+
#include "address_cache.h"
#include "cipher.h"
#include "conf.h"
#include "connection.h"
+#include "compression.h"
#include "crypto.h"
#include "digest.h"
#include "device.h"
#include "ethernet.h"
#include "ipv4.h"
#include "ipv6.h"
-#include "graph.h"
#include "logger.h"
#include "net.h"
#include "netutl.h"
#include "protocol.h"
#include "route.h"
#include "utils.h"
-#include "xalloc.h"
#ifndef MAX
#define MAX(a, b) ((a) > (b) ? (a) : (b))
static char lzo_wrkmem[LZO1X_999_MEM_COMPRESS > LZO1X_1_MEM_COMPRESS ? LZO1X_999_MEM_COMPRESS : LZO1X_1_MEM_COMPRESS];
#endif
+#ifdef HAVE_LZ4_BUILTIN
+static LZ4_stream_t lz4_stream;
+#else
+static void *lz4_state = NULL;
+#endif /* HAVE_LZ4_BUILTIN */
+
static void send_udppacket(node_t *, vpn_packet_t *);
unsigned replaywin = 32;
len = ntohs(len16);
}
- if(n->udp_ping_sent.tv_sec != 0) { // a probe in flight
+ if(n->status.ping_sent) { // 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;
+ n->udp_ping_rtt = (int)(rtt.tv_sec * 1000000 + rtt.tv_usec);
+ n->status.ping_sent = false;
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 {
logger(DEBUG_TRAFFIC, LOG_INFO, "Got type %d UDP probe reply %d from %s (%s)", DATA(packet)[0], len, n->name, n->hostname);
reset_address_cache(n->address_cache, &n->address);
}
- // Reset the UDP ping timer. (no probe in flight)
- n->udp_ping_sent.tv_sec = 0;
+ // Reset the UDP ping timer.
if(udp_discovery) {
timeout_del(&n->udp_ping_timeout);
}
}
-static length_t compress_packet(uint8_t *dest, const uint8_t *source, length_t len, int level) {
- if(level == 0) {
- memcpy(dest, source, len);
- return len;
- } else if(level == 10) {
+#ifdef HAVE_LZ4
+static length_t compress_packet_lz4(uint8_t *dest, const uint8_t *source, length_t len) {
+#ifdef HAVE_LZ4_BUILTIN
+ return LZ4_compress_fast_extState(&lz4_stream, (const char *) source, (char *) dest, len, MAXSIZE, 0);
+#else
+
+ /* @FIXME: Put this in a better place, and free() it too. */
+ if(lz4_state == NULL) {
+ lz4_state = malloc(LZ4_sizeofState());
+ }
+
+ if(lz4_state == NULL) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Failed to allocate lz4_state, error: %i", errno);
+ return 0;
+ }
+
+ return LZ4_compress_fast_extState(lz4_state, (const char *) source, (char *) dest, len, MAXSIZE, 0);
+#endif /* HAVE_LZ4_BUILTIN */
+}
+#endif /* HAVE_LZ4 */
+
#ifdef HAVE_LZO
- lzo_uint lzolen = MAXSIZE;
- lzo1x_1_compress(source, len, dest, &lzolen, lzo_wrkmem);
+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;
+
+ if(level == COMPRESS_LZO_HI) {
+ result = lzo1x_999_compress(source, len, dest, &lzolen, lzo_wrkmem);
+ } else { // level == COMPRESS_LZO_LO
+ result = lzo1x_1_compress(source, len, dest, &lzolen, lzo_wrkmem);
+ }
+
+ if(result == LZO_E_OK) {
return lzolen;
-#else
+ } else {
return 0;
+ }
+}
#endif
- } else if(level < 10) {
-#ifdef HAVE_ZLIB
- unsigned long destlen = MAXSIZE;
- if(compress2(dest, &destlen, source, len, level) == Z_OK) {
- return destlen;
- } else
+static length_t compress_packet(uint8_t *dest, const uint8_t *source, length_t len, compression_level_t level) {
+ switch(level) {
+#ifdef HAVE_LZ4
+
+ case COMPRESS_LZ4:
+ return compress_packet_lz4(dest, source, len);
#endif
- return 0;
- } else {
+
#ifdef HAVE_LZO
- lzo_uint lzolen = MAXSIZE;
- lzo1x_999_compress(source, len, dest, &lzolen, lzo_wrkmem);
- return lzolen;
-#else
- return 0;
+
+ case COMPRESS_LZO_HI:
+ case COMPRESS_LZO_LO:
+ return compress_packet_lzo(dest, source, len, level);
#endif
+#ifdef HAVE_ZLIB
+
+ case COMPRESS_ZLIB_9:
+ case COMPRESS_ZLIB_8:
+ case COMPRESS_ZLIB_7:
+ case COMPRESS_ZLIB_6:
+ case COMPRESS_ZLIB_5:
+ case COMPRESS_ZLIB_4:
+ case COMPRESS_ZLIB_3:
+ case COMPRESS_ZLIB_2:
+ case COMPRESS_ZLIB_1: {
+ unsigned long dest_len = MAXSIZE;
+
+ if(compress2(dest, &dest_len, source, len, level) == Z_OK) {
+ return dest_len;
+ } else {
+ return 0;
+ }
}
- return 0;
-}
+#endif
-static length_t uncompress_packet(uint8_t *dest, const uint8_t *source, length_t len, int level) {
- if(level == 0) {
+ case COMPRESS_NONE:
memcpy(dest, source, len);
return len;
- } else if(level > 9) {
-#ifdef HAVE_LZO
- lzo_uint lzolen = MAXSIZE;
- if(lzo1x_decompress_safe(source, len, dest, &lzolen, NULL) == LZO_E_OK) {
- return lzolen;
- } else
+ default:
+ return 0;
+ }
+}
+
+static length_t uncompress_packet(uint8_t *dest, const uint8_t *source, length_t len, compression_level_t level) {
+ switch(level) {
+#ifdef HAVE_LZ4
+
+ case COMPRESS_LZ4:
+ return LZ4_decompress_safe((char *)source, (char *) dest, len, MAXSIZE);
+
#endif
+#ifdef HAVE_LZO
+
+ case COMPRESS_LZO_HI:
+ case COMPRESS_LZO_LO: {
+ lzo_uint dst_len = MAXSIZE;
+
+ if(lzo1x_decompress_safe(source, len, dest, &dst_len, NULL) == LZO_E_OK) {
+ return dst_len;
+ } else {
return 0;
+ }
}
+#endif
#ifdef HAVE_ZLIB
- else {
+
+ case COMPRESS_ZLIB_9:
+ case COMPRESS_ZLIB_8:
+ case COMPRESS_ZLIB_7:
+ case COMPRESS_ZLIB_6:
+ case COMPRESS_ZLIB_5:
+ case COMPRESS_ZLIB_4:
+ case COMPRESS_ZLIB_3:
+ case COMPRESS_ZLIB_2:
+ case COMPRESS_ZLIB_1: {
unsigned long destlen = MAXSIZE;
static z_stream stream;
#endif
- return 0;
+ case COMPRESS_NONE:
+ memcpy(dest, source, len);
+ return len;
+
+ default:
+ return 0;
+ }
}
/* VPN packet I/O */
length_t origlen = inpkt->len;
- if(n->incompression) {
+ if(n->incompression != COMPRESS_NONE) {
vpn_packet_t *outpkt = pkt[nextpkt++];
if(!(outpkt->len = uncompress_packet(DATA(outpkt), DATA(inpkt), inpkt->len, n->incompression))) {
/* If we're not the final recipient, relay the packet. */
if(to != myself) {
- send_sptps_data(to, from, 0, data, len);
+ if(to->status.validkey) {
+ send_sptps_data(to, from, 0, data, len);
+ }
+
try_tx(to, true);
return true;
}
int offset = 0;
if((!(DATA(origpkt)[12] | DATA(origpkt)[13])) && (n->sptps.outstate)) {
- sptps_send_record(&n->sptps, PKT_PROBE, (char *)DATA(origpkt), origpkt->len);
+ sptps_send_record(&n->sptps, PKT_PROBE, DATA(origpkt), origpkt->len);
return;
}
vpn_packet_t outpkt;
- if(n->outcompression) {
+ if(n->outcompression != COMPRESS_NONE) {
outpkt.offset = 0;
length_t len = compress_packet(DATA(&outpkt) + offset, DATA(origpkt) + offset, origpkt->len - offset, n->outcompression);
} else {
sptps_send_record(&n->sptps, type, DATA(origpkt) + offset, origpkt->len - offset);
}
-
- return;
}
-static void adapt_socket(const sockaddr_t *sa, int *sock) {
+static void adapt_socket(const sockaddr_t *sa, size_t *sock) {
/* Make sure we have a suitable socket for the chosen address */
if(listen_socket[*sock].sa.sa.sa_family != sa->sa.sa_family) {
for(int i = 0; i < listen_sockets; i++) {
}
}
-static void choose_udp_address(const node_t *n, const sockaddr_t **sa, int *sock) {
+static void choose_udp_address(const node_t *n, const sockaddr_t **sa, size_t *sock) {
/* Latest guess */
*sa = &n->address;
*sock = n->sock;
/* Otherwise, address are found in edges to this node.
So we pick a random edge and a random socket. */
- int i = 0;
- int j = rand() % n->edge_tree->count;
+ unsigned int i = 0;
+ unsigned int j = rand() % n->edge_tree->count;
edge_t *candidate = NULL;
for splay_each(edge_t, e, n->edge_tree) {
adapt_socket(*sa, sock);
}
-static void choose_local_address(const node_t *n, const sockaddr_t **sa, int *sock) {
+static void choose_local_address(const node_t *n, const sockaddr_t **sa, size_t *sock) {
*sa = NULL;
/* Pick one of the edges from this node at random, then use its local address. */
- int i = 0;
- int j = rand() % n->edge_tree->count;
+ unsigned int i = 0;
+ unsigned int j = rand() % n->edge_tree->count;
edge_t *candidate = NULL;
for splay_each(edge_t, e, n->edge_tree) {
/* Compress the packet */
- if(n->outcompression) {
+ if(n->outcompression != COMPRESS_NONE) {
outpkt = pkt[nextpkt++];
if(!(outpkt->len = compress_packet(DATA(outpkt), DATA(inpkt), inpkt->len, n->outcompression))) {
/* Send the packet */
const sockaddr_t *sa = NULL;
- int sock;
+ size_t sock;
if(n->status.send_locally) {
choose_local_address(n, &sa, &sock);
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;
+ uint8_t buf[len + sizeof(to->id) + sizeof(from->id)];
+ uint8_t *buf_ptr = buf;
memcpy(buf_ptr, &to->id, sizeof(to->id));
buf_ptr += sizeof(to->id);
memcpy(buf_ptr, &from->id, sizeof(from->id));
overhead += sizeof(to->id) + sizeof(from->id);
}
- char buf[len + overhead];
- char *buf_ptr = buf;
+ uint8_t buf[len + overhead];
+ uint8_t *buf_ptr = buf;
if(relay_supported) {
if(direct) {
buf_ptr += len;
const sockaddr_t *sa = NULL;
- int sock;
+ size_t sock;
if(relay->status.send_locally) {
choose_local_address(relay, &sa, &sock);
return;
}
-static void send_udp_probe_packet(node_t *n, int len) {
+static void send_udp_probe_packet(node_t *n, size_t len) {
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);
+ len = sizeof(packet.data);
+ }
+
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 %d to %s (%s)", len, n->name, n->hostname);
+ logger(DEBUG_TRAFFIC, LOG_INFO, "Sending UDP probe length %zu to %s (%s)", len, n->name, n->hostname);
send_udppacket(n, &packet);
}
struct timeval ping_tx_elapsed;
timersub(&now, &n->udp_ping_sent, &ping_tx_elapsed);
- int interval = n->status.udp_confirmed ? udp_discovery_keepalive_interval : udp_discovery_interval;
+ 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
+ n->status.ping_sent = true;
send_udp_probe_packet(n, MIN_PROBE_SIZE);
if(localdiscovery && !n->status.udp_confirmed && n->prevedge) {
int sock = -1;
const sockaddr_t *sa = NULL;
- int sockindex;
+ size_t sockindex;
choose_udp_address(n, &sa, &sockindex);
if(!sa) {
return mtu;
#else
-
+ (void)n;
return MTU;
-
#endif
}
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 multiplier = (n->maxmtu == MTU) ? 0.97f : 1.0f;
- const float cycle_position = probes_per_cycle - (n->mtuprobes % probes_per_cycle) - 1;
+ 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 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));
+ const float interval = (float)(n->maxmtu - minmtu);
+
+ length_t offset = 0;
+
+ /* powf can be underflowed if n->maxmtu is less than 512 due to the minmtu MAX bound */
+ if(interval > 0) {
+ /* 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. */
+ offset = (length_t) powf(interval, multiplier * cycle_position / ((float) probes_per_cycle - 1.0f));
+ }
length_t maxmtu = n->maxmtu;
send_udp_probe_packet(n, minmtu + offset);
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(from && from->status.sptps && !memcmp(DSTID(pkt), &nullid, sizeof(nullid))) {
if(sptps_verify_datagram(&from->sptps, DATA(pkt), pkt->len - 2 * sizeof(node_id_t))) {
n = from;
} else {
pkt->len -= pkt->offset;
}
- if(!memcmp(DSTID(pkt), &nullid, sizeof(nullid)) || !relay_enabled) {
+ if(!relay_enabled || !memcmp(DSTID(pkt), &nullid, sizeof(nullid))) {
direct = true;
from = n;
to = myself;
#ifdef HAVE_RECVMMSG
#define MAX_MSG 64
- static int num = MAX_MSG;
+ static ssize_t num = MAX_MSG;
static vpn_packet_t pkt[MAX_MSG];
static sockaddr_t addr[MAX_MSG];
static struct mmsghdr msg[MAX_MSG];
#else
vpn_packet_t pkt;
- sockaddr_t addr = {};
+ 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);
+ ssize_t len = recvfrom(ls->udp.fd, (void *)DATA(&pkt), MAXSIZE, 0, &addr.sa, &addrlen);
- if(len <= 0 || len > MAXSIZE) {
+ if(len <= 0 || (size_t)len > MAXSIZE) {
if(!sockwouldblock(sockerrno)) {
logger(DEBUG_ALWAYS, LOG_ERR, "Receiving packet failed: %s", sockstrerror(sockerrno));
}
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