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@ -18,6 +18,7 @@ |
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#include "n2n.h" |
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#include "lzoconf.h" |
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#include <zstd.h> |
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#ifdef WIN32 |
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#include <process.h> |
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@ -157,6 +158,17 @@ const char* transop_str(enum n2n_transform tr) { |
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/* ************************************** */ |
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const char* compression_str(uint8_t cmpr) { |
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switch(cmpr) { |
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case N2N_COMPRESSION_ID_NONE: return("none"); |
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case N2N_COMPRESSION_ID_LZO: return("lzo1x"); |
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case N2N_COMPRESSION_ID_ZSTD: return("zstd"); |
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default: return("invalid"); |
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}; |
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} |
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/* ************************************** */ |
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/** Destination 01:00:5E:00:00:00 - 01:00:5E:7F:FF:FF is multicast ethernet.
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*/ |
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static int is_ethMulticast(const void * buf, size_t bufsize) { |
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@ -236,6 +248,10 @@ n2n_edge_t* edge_init(const tuntap_dev *dev, const n2n_edge_conf_t *conf, int *r |
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goto edge_init_error; |
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} |
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#ifdef N2N_HAVE_ZSTD |
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// zstd does not require initialization. if it were required, this would be a good place
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#endif |
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for(i=0; i<conf->sn_num; ++i) |
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traceEvent(TRACE_NORMAL, "supernode %u => %s\n", i, (conf->sn_ip_array[i])); |
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@ -992,20 +1008,37 @@ static int handle_PACKET(n2n_edge_t * eee, |
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/* decompress if necessary */ |
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uint8_t * deflation_buffer = 0; |
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uint32_t deflated_len; |
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int32_t deflated_len; |
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switch (rx_compression_id) { |
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case N2N_COMPRESSION_ID_NONE: |
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break; // continue afterwards
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case N2N_COMPRESSION_ID_LZO: |
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deflation_buffer = malloc (N2N_PKT_BUF_SIZE); |
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deflation_buffer = malloc (N2N_PKT_BUF_SIZE); |
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lzo1x_decompress (eth_payload, eth_size, deflation_buffer, (lzo_uint*)&deflated_len, NULL); |
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break; |
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default: |
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#ifdef N2N_HAVE_ZSTD |
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case N2N_COMPRESSION_ID_ZSTD: |
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deflated_len = N2N_PKT_BUF_SIZE; |
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deflation_buffer = malloc (deflated_len); |
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deflated_len = (int32_t)ZSTD_decompress (deflation_buffer, deflated_len, eth_payload, eth_size); |
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if (ZSTD_isError(deflated_len)) { |
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traceEvent (TRACE_ERROR, "payload decompression failed with zstd error '%s'.", |
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ZSTD_getErrorName(deflated_len)); |
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free (deflation_buffer); |
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return (-1); // cannot help it
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} |
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break; |
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#endif |
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default: |
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traceEvent (TRACE_ERROR, "payload decompression failed: received packet indicating unsupported %s compression.", |
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compression_str(rx_compression_id)); |
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return (-1); // cannot handle it
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} |
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if (rx_compression_id) { |
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traceEvent (TRACE_DEBUG, "payload decompression [id: %u]: deflated %u bytes to %u bytes", |
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rx_compression_id, eth_size, (int)deflated_len); |
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traceEvent (TRACE_DEBUG, "payload decompression [%s]: deflated %u bytes to %u bytes", |
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compression_str(rx_compression_id), eth_size, (int)deflated_len); |
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memcpy(eth_payload ,deflation_buffer, deflated_len ); |
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eth_size = deflated_len; |
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free (deflation_buffer); |
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@ -1370,9 +1403,11 @@ static void send_packet2net(n2n_edge_t * eee, |
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// compression needs to be tried before encode_PACKET is called for compression indication gets encoded there
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pkt.compression = N2N_COMPRESSION_ID_NONE; |
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if (eee->conf.compression) { |
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uint8_t * compression_buffer; |
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uint32_t compression_len; |
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int32_t compression_len; |
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switch (eee->conf.compression) { |
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case N2N_COMPRESSION_ID_LZO: |
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compression_buffer = malloc (len + len / 16 + 64 + 3); |
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@ -1382,14 +1417,30 @@ static void send_packet2net(n2n_edge_t * eee, |
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} |
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} |
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break; |
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#ifdef N2N_HAVE_ZSTD |
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case N2N_COMPRESSION_ID_ZSTD: |
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compression_len = N2N_PKT_BUF_SIZE + 128; |
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compression_buffer = malloc (compression_len); // leaves enough room, for exact size call compression_len = ZSTD_compressBound (len); (slower)
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compression_len = (int32_t)ZSTD_compress(compression_buffer, compression_len, tap_pkt, len, ZSTD_COMPRESSION_LEVEL) ; |
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if (!ZSTD_isError(compression_len)) { |
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if (compression_len < len) { |
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pkt.compression = N2N_COMPRESSION_ID_ZSTD; |
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} |
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} else { |
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traceEvent (TRACE_ERROR, "payload compression failed with zstd error '%s'.", |
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ZSTD_getErrorName(compression_len)); |
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free (compression_buffer); |
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// continue with unset without pkt.compression --> will send uncompressed
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} |
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break; |
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#endif |
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default: |
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break; |
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} |
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if (pkt.compression) { |
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traceEvent (TRACE_DEBUG, "payload compression [id: %u]: compressed %u bytes to %u bytes\n", |
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pkt.compression, len, compression_len); |
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traceEvent (TRACE_DEBUG, "payload compression [%s]: compressed %u bytes to %u bytes\n", |
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compression_str(pkt.compression), len, compression_len); |
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memcpy (tap_pkt, compression_buffer, compression_len); |
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len = compression_len; |
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Luca Deri
4 years ago
GitHub