From 6b92ac505d2cd5c7e390d49bf1f0b399ef9f8327 Mon Sep 17 00:00:00 2001 From: Guus Sliepen Date: Wed, 24 Dec 2014 22:23:24 +0100 Subject: [PATCH] Add a variable offset to vpn_packet_t, drop sptps_packet_t. The offset value indicates where the actual payload starts, so we can process both legacy and SPTPS UDP packets without having to do casting tricks and/or moving memory around. --- src/bsd/device.c | 44 +++++------ src/cygwin/device.c | 6 +- src/linux/device.c | 14 ++-- src/mingw/device.c | 4 +- src/multicast_device.c | 8 +- src/net.h | 19 +++-- src/net_packet.c | 142 +++++++++++++++++++--------------- src/protocol_auth.c | 8 +- src/protocol_misc.c | 2 +- src/raw_socket_device.c | 4 +- src/route.c | 163 ++++++++++++++++++++-------------------- src/solaris/device.c | 24 +++--- src/uml_device.c | 4 +- src/vde_device.c | 4 +- 14 files changed, 234 insertions(+), 212 deletions(-) diff --git a/src/bsd/device.c b/src/bsd/device.c index d0d0b58..d1a993b 100644 --- a/src/bsd/device.c +++ b/src/bsd/device.c @@ -1,7 +1,7 @@ /* device.c -- Interaction BSD tun/tap device Copyright (C) 2001-2005 Ivo Timmermans, - 2001-2013 Guus Sliepen + 2001-2014 Guus Sliepen 2009 Grzegorz Dymarek This program is free software; you can redistribute it and/or modify @@ -222,10 +222,10 @@ static bool read_packet(vpn_packet_t *packet) { #ifdef ENABLE_TUNEMU case DEVICE_TYPE_TUNEMU: if(device_type == DEVICE_TYPE_TUNEMU) - inlen = tunemu_read(device_fd, packet->data + 14, MTU - 14); + inlen = tunemu_read(device_fd, DATA(packet) + 14, MTU - 14); else #endif - inlen = read(device_fd, packet->data + 14, MTU - 14); + inlen = read(device_fd, DATA(packet) + 14, MTU - 14); if(inlen <= 0) { logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s", device_info, @@ -233,29 +233,29 @@ static bool read_packet(vpn_packet_t *packet) { return false; } - switch(packet->data[14] >> 4) { + switch(DATA(packet)[14] >> 4) { case 4: - packet->data[12] = 0x08; - packet->data[13] = 0x00; + DATA(packet)[12] = 0x08; + DATA(packet)[13] = 0x00; break; case 6: - packet->data[12] = 0x86; - packet->data[13] = 0xDD; + DATA(packet)[12] = 0x86; + DATA(packet)[13] = 0xDD; break; default: logger(DEBUG_TRAFFIC, LOG_ERR, "Unknown IP version %d while reading packet from %s %s", - packet->data[14] >> 4, device_info, device); + DATA(packet)[14] >> 4, device_info, device); return false; } - memset(packet->data, 0, 12); + memset(DATA(packet), 0, 12); packet->len = inlen + 14; break; case DEVICE_TYPE_TUNIFHEAD: { u_int32_t type; - struct iovec vector[2] = {{&type, sizeof type}, {packet->data + 14, MTU - 14}}; + struct iovec vector[2] = {{&type, sizeof type}, {DATA(packet) + 14, MTU - 14}}; if((inlen = readv(device_fd, vector, 2)) <= 0) { logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s", device_info, @@ -265,13 +265,13 @@ static bool read_packet(vpn_packet_t *packet) { switch (ntohl(type)) { case AF_INET: - packet->data[12] = 0x08; - packet->data[13] = 0x00; + DATA(packet)[12] = 0x08; + DATA(packet)[13] = 0x00; break; case AF_INET6: - packet->data[12] = 0x86; - packet->data[13] = 0xDD; + DATA(packet)[12] = 0x86; + DATA(packet)[13] = 0xDD; break; default: @@ -281,13 +281,13 @@ static bool read_packet(vpn_packet_t *packet) { return false; } - memset(packet->data, 0, 12); + memset(DATA(packet), 0, 12); packet->len = inlen + 10; break; } case DEVICE_TYPE_TAP: - if((inlen = read(device_fd, packet->data, MTU)) <= 0) { + if((inlen = read(device_fd, DATA(packet), MTU)) <= 0) { logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s", device_info, device, strerror(errno)); return false; @@ -312,7 +312,7 @@ static bool write_packet(vpn_packet_t *packet) { switch(device_type) { case DEVICE_TYPE_TUN: - if(write(device_fd, packet->data + 14, packet->len - 14) < 0) { + if(write(device_fd, DATA(packet) + 14, packet->len - 14) < 0) { logger(DEBUG_ALWAYS, LOG_ERR, "Error while writing to %s %s: %s", device_info, device, strerror(errno)); return false; @@ -321,10 +321,10 @@ static bool write_packet(vpn_packet_t *packet) { case DEVICE_TYPE_TUNIFHEAD: { u_int32_t type; - struct iovec vector[2] = {{&type, sizeof type}, {packet->data + 14, packet->len - 14}}; + struct iovec vector[2] = {{&type, sizeof type}, {DATA(packet) + 14, packet->len - 14}}; int af; - af = (packet->data[12] << 8) + packet->data[13]; + af = (DATA(packet)[12] << 8) + DATA(packet)[13]; switch (af) { case 0x0800: @@ -349,7 +349,7 @@ static bool write_packet(vpn_packet_t *packet) { } case DEVICE_TYPE_TAP: - if(write(device_fd, packet->data, packet->len) < 0) { + if(write(device_fd, DATA(packet), packet->len) < 0) { logger(DEBUG_ALWAYS, LOG_ERR, "Error while writing to %s %s: %s", device_info, device, strerror(errno)); return false; @@ -358,7 +358,7 @@ static bool write_packet(vpn_packet_t *packet) { #ifdef ENABLE_TUNEMU case DEVICE_TYPE_TUNEMU: - if(tunemu_write(device_fd, packet->data + 14, packet->len - 14) < 0) { + if(tunemu_write(device_fd, DATA(packet) + 14, packet->len - 14) < 0) { logger(DEBUG_ALWAYS, LOG_ERR, "Error while writing to %s %s: %s", device_info, device, strerror(errno)); return false; diff --git a/src/cygwin/device.c b/src/cygwin/device.c index d522b4f..4c3a60d 100644 --- a/src/cygwin/device.c +++ b/src/cygwin/device.c @@ -1,7 +1,7 @@ /* device.c -- Interaction with Windows tap driver in a Cygwin environment Copyright (C) 2002-2005 Ivo Timmermans, - 2002-2013 Guus Sliepen + 2002-2014 Guus Sliepen This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -227,7 +227,7 @@ static void close_device(void) { static bool read_packet(vpn_packet_t *packet) { int inlen; - if((inlen = read(sp[0], packet->data, MTU)) <= 0) { + if((inlen = read(sp[0], DATA(packet), MTU)) <= 0) { logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s", device_info, device, strerror(errno)); return false; @@ -247,7 +247,7 @@ static bool write_packet(vpn_packet_t *packet) { logger(DEBUG_TRAFFIC, LOG_DEBUG, "Writing packet of %d bytes to %s", packet->len, device_info); - if(!WriteFile (device_handle, packet->data, packet->len, &outlen, NULL)) { + if(!WriteFile (device_handle, DATA(packet), packet->len, &outlen, NULL)) { logger(DEBUG_ALWAYS, LOG_ERR, "Error while writing to %s %s: %s", device_info, device, winerror(GetLastError())); return false; } diff --git a/src/linux/device.c b/src/linux/device.c index 5f925ce..5717d92 100644 --- a/src/linux/device.c +++ b/src/linux/device.c @@ -1,7 +1,7 @@ /* device.c -- Interaction with Linux ethertap and tun/tap device Copyright (C) 2001-2005 Ivo Timmermans, - 2001-2013 Guus Sliepen + 2001-2014 Guus Sliepen This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -131,7 +131,7 @@ static bool read_packet(vpn_packet_t *packet) { switch(device_type) { case DEVICE_TYPE_TUN: - inlen = read(device_fd, packet->data + 10, MTU - 10); + inlen = read(device_fd, DATA(packet) + 10, MTU - 10); if(inlen <= 0) { logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s", @@ -139,11 +139,11 @@ static bool read_packet(vpn_packet_t *packet) { return false; } - memset(packet->data, 0, 12); + memset(DATA(packet), 0, 12); packet->len = inlen + 10; break; case DEVICE_TYPE_TAP: - inlen = read(device_fd, packet->data, MTU); + inlen = read(device_fd, DATA(packet), MTU); if(inlen <= 0) { logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s", @@ -169,15 +169,15 @@ static bool write_packet(vpn_packet_t *packet) { switch(device_type) { case DEVICE_TYPE_TUN: - packet->data[10] = packet->data[11] = 0; - if(write(device_fd, packet->data + 10, packet->len - 10) < 0) { + DATA(packet)[10] = DATA(packet)[11] = 0; + if(write(device_fd, DATA(packet) + 10, packet->len - 10) < 0) { logger(DEBUG_ALWAYS, LOG_ERR, "Can't write to %s %s: %s", device_info, device, strerror(errno)); return false; } break; case DEVICE_TYPE_TAP: - if(write(device_fd, packet->data, packet->len) < 0) { + if(write(device_fd, DATA(packet), packet->len) < 0) { logger(DEBUG_ALWAYS, LOG_ERR, "Can't write to %s %s: %s", device_info, device, strerror(errno)); return false; diff --git a/src/mingw/device.c b/src/mingw/device.c index 6ee26e7..19719a7 100644 --- a/src/mingw/device.c +++ b/src/mingw/device.c @@ -1,7 +1,7 @@ /* device.c -- Interaction with Windows tap driver in a MinGW environment Copyright (C) 2002-2005 Ivo Timmermans, - 2002-2013 Guus Sliepen + 2002-2014 Guus Sliepen This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -236,7 +236,7 @@ static bool write_packet(vpn_packet_t *packet) { logger(DEBUG_TRAFFIC, LOG_DEBUG, "Writing packet of %d bytes to %s", packet->len, device_info); - if(!WriteFile(device_handle, packet->data, packet->len, &outlen, &overlapped)) { + if(!WriteFile(device_handle, DATA(packet), packet->len, &outlen, &overlapped)) { logger(DEBUG_ALWAYS, LOG_ERR, "Error while writing to %s %s: %s", device_info, device, winerror(GetLastError())); return false; } diff --git a/src/multicast_device.c b/src/multicast_device.c index 4d5f10a..931a8d0 100644 --- a/src/multicast_device.c +++ b/src/multicast_device.c @@ -162,13 +162,13 @@ static void close_device(void) { static bool read_packet(vpn_packet_t *packet) { int lenin; - if((lenin = recv(device_fd, (void *)packet->data, MTU, 0)) <= 0) { + if((lenin = recv(device_fd, DATA(packet), MTU, 0)) <= 0) { logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s", device_info, device, sockstrerror(sockerrno)); return false; } - if(!memcmp(&ignore_src, packet->data + 6, sizeof ignore_src)) { + if(!memcmp(&ignore_src, DATA(packet) + 6, sizeof ignore_src)) { logger(DEBUG_SCARY_THINGS, LOG_DEBUG, "Ignoring loopback packet of %d bytes from %s", lenin, device_info); return false; } @@ -185,13 +185,13 @@ static bool write_packet(vpn_packet_t *packet) { logger(DEBUG_TRAFFIC, LOG_DEBUG, "Writing packet of %d bytes to %s", packet->len, device_info); - if(sendto(device_fd, (void *)packet->data, packet->len, 0, ai->ai_addr, ai->ai_addrlen) < 0) { + if(sendto(device_fd, DATA(packet), packet->len, 0, ai->ai_addr, ai->ai_addrlen) < 0) { logger(DEBUG_ALWAYS, LOG_ERR, "Can't write to %s %s: %s", device_info, device, sockstrerror(sockerrno)); return false; } - memcpy(&ignore_src, packet->data + 6, sizeof ignore_src); + memcpy(&ignore_src, DATA(packet) + 6, sizeof ignore_src); return true; } diff --git a/src/net.h b/src/net.h index 507de34..dcc99a4 100644 --- a/src/net.h +++ b/src/net.h @@ -57,6 +57,7 @@ typedef struct node_id_t { } node_id_t; typedef short length_t; +typedef uint32_t seqno_t; #define AF_UNKNOWN 255 @@ -84,21 +85,19 @@ typedef union sockaddr_t { #define SALEN(s) (s.sa_family==AF_INET?sizeof(struct sockaddr_in):sizeof(struct sockaddr_in6)) #endif +#define SEQNO(x) ((x)->data + (x)->offset - 4) +#define SRCID(x) ((node_id_t *)((x)->data + (x)->offset - 6)) +#define DSTID(x) ((node_id_t *)((x)->data + (x)->offset - 12)) +#define DATA(x) ((x)->data + (x)->offset) +#define DEFAULT_PACKET_OFFSET 12 + typedef struct vpn_packet_t { - length_t len; /* the actual number of bytes in the `data' field */ + length_t len; /* The actual number of valid bytes in the `data' field (including seqno or dstid/srcid) */ + length_t offset; /* Offset in the buffer where the packet data starts (righter after seqno or dstid/srcid) */ int priority; /* priority or TOS */ - uint32_t seqno; /* 32 bits sequence number (network byte order of course) */ uint8_t data[MAXSIZE]; } vpn_packet_t; -typedef struct sptps_packet_t { - length_t len; /* the actual number of bytes in the `data' field */ - int priority; /* priority or TOS */ - node_id_t dstid; /* node ID of the final recipient */ - node_id_t srcid; /* node ID of the original sender */ - char data[MAXSIZE]; -} sptps_packet_t; - /* Packet types when using SPTPS */ #define PKT_COMPRESSED 1 diff --git a/src/net_packet.c b/src/net_packet.c index 7ca1894..16dac43 100644 --- a/src/net_packet.c +++ b/src/net_packet.c @@ -139,8 +139,9 @@ static void send_mtu_probe_handler(void *data) { len = 64; vpn_packet_t packet; - memset(packet.data, 0, 14); - randomize(packet.data + 14, len - 14); + packet.offset = DEFAULT_PACKET_OFFSET; + memset(DATA(&packet), 0, 14); + randomize(DATA(&packet) + 14, len - 14); packet.len = len; packet.priority = 0; n->status.send_locally = i >= 4 && n->mtuprobes <= 10 && n->prevedge; @@ -176,24 +177,24 @@ void send_mtu_probe(node_t *n) { } static void mtu_probe_h(node_t *n, vpn_packet_t *packet, length_t len) { - if(!packet->data[0]) { + if(!DATA(packet)[0]) { logger(DEBUG_TRAFFIC, LOG_INFO, "Got MTU probe request %d from %s (%s)", packet->len, n->name, n->hostname); /* 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 = packet->data; + 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 = data - packet->data; + packet->len -= 10; } else { /* Legacy protocol: n won't understand type 2 probe replies. */ - packet->data[0] = 1; + DATA(packet)[0] = 1; } /* Temporarily set udp_confirmed, so that the reply is sent @@ -205,14 +206,14 @@ static void mtu_probe_h(node_t *n, vpn_packet_t *packet, length_t len) { n->status.udp_confirmed = udp_confirmed; } else { length_t probelen = len; - if (packet->data[0] == 2) { + if (DATA(packet)[0] == 2) { if (len < 3) logger(DEBUG_TRAFFIC, LOG_WARNING, "Received invalid (too short) MTU probe reply from %s (%s)", n->name, n->hostname); else { - uint16_t probelen16; memcpy(&probelen16, packet->data + 1, 2); probelen = ntohs(probelen16); + uint16_t probelen16; memcpy(&probelen16, DATA(packet) + 1, 2); probelen = ntohs(probelen16); } } - logger(DEBUG_TRAFFIC, LOG_INFO, "Got type %d MTU probe reply %d from %s (%s)", packet->data[0], probelen, n->name, n->hostname); + logger(DEBUG_TRAFFIC, LOG_INFO, "Got type %d MTU probe reply %d from %s (%s)", DATA(packet)[0], probelen, n->name, n->hostname); /* It's a valid reply: now we know bidirectional communication is possible using the address and socket that the reply @@ -254,9 +255,9 @@ static void mtu_probe_h(node_t *n, vpn_packet_t *packet, length_t len) { timersub(&now, &n->probe_time, &diff); struct timeval probe_timestamp = now; - if (packet->data[0] == 2 && packet->len >= 11) { - uint32_t sec; memcpy(&sec, packet->data + 3, 4); - uint32_t usec; memcpy(&usec, packet->data + 7, 4); + 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); } @@ -348,12 +349,12 @@ static void receive_packet(node_t *n, vpn_packet_t *packet) { static bool try_mac(node_t *n, const vpn_packet_t *inpkt) { if(n->status.sptps) - return sptps_verify_datagram(&n->sptps, ((sptps_packet_t *)inpkt)->data, inpkt->len); + return sptps_verify_datagram(&n->sptps, DATA(inpkt), inpkt->len); - if(!digest_active(n->indigest) || inpkt->len < sizeof inpkt->seqno + digest_length(n->indigest)) + if(!digest_active(n->indigest) || inpkt->len < sizeof(seqno_t) + digest_length(n->indigest)) return false; - return digest_verify(n->indigest, (const char *)&inpkt->seqno, inpkt->len - digest_length(n->indigest), (const char *)&inpkt->seqno + inpkt->len - digest_length(n->indigest)); + return digest_verify(n->indigest, SEQNO(inpkt), inpkt->len - digest_length(n->indigest), DATA(inpkt) + inpkt->len - digest_length(n->indigest)); } static bool receive_udppacket(node_t *n, vpn_packet_t *inpkt) { @@ -361,6 +362,8 @@ static bool receive_udppacket(node_t *n, vpn_packet_t *inpkt) { 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) { @@ -372,7 +375,8 @@ static bool receive_udppacket(node_t *n, vpn_packet_t *inpkt) { } return false; } - if(!sptps_receive_data(&n->sptps, ((sptps_packet_t *)inpkt)->data, inpkt->len)) { + 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); return false; } @@ -386,17 +390,21 @@ static bool receive_udppacket(node_t *n, vpn_packet_t *inpkt) { /* Check packet length */ - if(inpkt->len < sizeof inpkt->seqno + digest_length(n->indigest)) { + if(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); return false; } + /* It's a legacy UDP packet, the data starts after the seqno */ + + inpkt->offset += sizeof(seqno_t); + /* Check the message authentication code */ if(digest_active(n->indigest)) { inpkt->len -= digest_length(n->indigest); - if(!digest_verify(n->indigest, &inpkt->seqno, inpkt->len, (const char *)&inpkt->seqno + inpkt->len)) { + 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; } @@ -407,7 +415,7 @@ static bool receive_udppacket(node_t *n, vpn_packet_t *inpkt) { vpn_packet_t *outpkt = pkt[nextpkt++]; outlen = MAXSIZE; - if(!cipher_decrypt(n->incipher, &inpkt->seqno, inpkt->len, &outpkt->seqno, &outlen, true)) { + if(!cipher_decrypt(n->incipher, SEQNO(inpkt), inpkt->len, SEQNO(outpkt), &outlen, true)) { logger(DEBUG_TRAFFIC, LOG_DEBUG, "Error decrypting packet from %s (%s)", n->name, n->hostname); return false; } @@ -418,8 +426,10 @@ static bool receive_udppacket(node_t *n, vpn_packet_t *inpkt) { /* Check the sequence number */ - inpkt->len -= sizeof inpkt->seqno; - uint32_t seqno = ntohl(inpkt->seqno); + seqno_t seqno; + memcpy(&seqno, SEQNO(inpkt), sizeof seqno); + seqno = ntohl(seqno); + inpkt->len -= sizeof seqno; if(replaywin) { if(seqno != n->received_seqno + 1) { @@ -463,7 +473,7 @@ static bool receive_udppacket(node_t *n, vpn_packet_t *inpkt) { if(n->incompression) { vpn_packet_t *outpkt = pkt[nextpkt++]; - if((outpkt->len = uncompress_packet(outpkt->data, inpkt->data, inpkt->len, n->incompression)) < 0) { + if((outpkt->len = uncompress_packet(DATA(outpkt), DATA(inpkt), inpkt->len, n->incompression)) < 0) { logger(DEBUG_TRAFFIC, LOG_ERR, "Error while uncompressing packet from %s (%s)", n->name, n->hostname); return false; @@ -476,7 +486,7 @@ static bool receive_udppacket(node_t *n, vpn_packet_t *inpkt) { inpkt->priority = 0; - if(!inpkt->data[12] && !inpkt->data[13]) + if(!DATA(inpkt)[12] && !DATA(inpkt)[13]) mtu_probe_h(n, inpkt, origlen); else receive_packet(n, inpkt); @@ -485,8 +495,9 @@ static bool receive_udppacket(node_t *n, vpn_packet_t *inpkt) { void receive_tcppacket(connection_t *c, const char *buffer, int len) { vpn_packet_t outpkt; + outpkt.offset = DEFAULT_PACKET_OFFSET; - if(len > sizeof outpkt.data) + if(len > sizeof outpkt.data - outpkt.offset) return; outpkt.len = len; @@ -494,7 +505,7 @@ void receive_tcppacket(connection_t *c, const char *buffer, int len) { outpkt.priority = 0; else outpkt.priority = -1; - memcpy(outpkt.data, buffer, len); + memcpy(DATA(&outpkt), buffer, len); receive_packet(c->node, &outpkt); } @@ -524,8 +535,8 @@ static void send_sptps_packet(node_t *n, vpn_packet_t *origpkt) { uint8_t type = 0; int offset = 0; - if(!(origpkt->data[12] | origpkt->data[13])) { - sptps_send_record(&n->sptps, PKT_PROBE, (char *)origpkt->data, origpkt->len); + if(!(DATA(origpkt)[12] | DATA(origpkt)[13])) { + sptps_send_record(&n->sptps, PKT_PROBE, (char *)DATA(origpkt), origpkt->len); return; } @@ -540,7 +551,8 @@ static void send_sptps_packet(node_t *n, vpn_packet_t *origpkt) { vpn_packet_t outpkt; if(n->outcompression) { - int len = compress_packet(outpkt.data + offset, origpkt->data + offset, origpkt->len - offset, n->outcompression); + outpkt.offset = 0; + int len = compress_packet(DATA(&outpkt) + offset, DATA(origpkt) + offset, origpkt->len - offset, n->outcompression); if(len < 0) { logger(DEBUG_TRAFFIC, LOG_ERR, "Error while compressing packet to %s (%s)", n->name, n->hostname); } else if(len < origpkt->len - offset) { @@ -550,7 +562,7 @@ static void send_sptps_packet(node_t *n, vpn_packet_t *origpkt) { } } - sptps_send_record(&n->sptps, type, (char *)origpkt->data + offset, origpkt->len - offset); + sptps_send_record(&n->sptps, type, DATA(origpkt) + offset, origpkt->len - offset); return; } @@ -643,6 +655,9 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) { 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; @@ -668,7 +683,7 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) { return; } - if(n->options & OPTION_PMTU_DISCOVERY && inpkt->len > n->minmtu && (inpkt->data[12] | inpkt->data[13])) { + 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"); @@ -686,7 +701,7 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) { if(n->outcompression) { outpkt = pkt[nextpkt++]; - if((outpkt->len = compress_packet(outpkt->data, inpkt->data, inpkt->len, n->outcompression)) < 0) { + if((outpkt->len = compress_packet(DATA(outpkt), DATA(inpkt), inpkt->len, n->outcompression)) < 0) { logger(DEBUG_TRAFFIC, LOG_ERR, "Error while compressing packet to %s (%s)", n->name, n->hostname); return; @@ -697,8 +712,9 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) { /* Add sequence number */ - inpkt->seqno = htonl(++(n->sent_seqno)); - inpkt->len += sizeof inpkt->seqno; + seqno_t seqno = htonl(++(n->sent_seqno)); + memcpy(SEQNO(inpkt), &seqno, sizeof seqno); + inpkt->len += sizeof seqno; /* Encrypt the packet */ @@ -706,7 +722,7 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) { outpkt = pkt[nextpkt++]; outlen = MAXSIZE; - if(!cipher_encrypt(n->outcipher, &inpkt->seqno, inpkt->len, &outpkt->seqno, &outlen, true)) { + if(!cipher_encrypt(n->outcipher, SEQNO(inpkt), inpkt->len, SEQNO(outpkt), &outlen, true)) { logger(DEBUG_TRAFFIC, LOG_ERR, "Error while encrypting packet to %s (%s)", n->name, n->hostname); goto end; } @@ -718,7 +734,7 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) { /* Add the message authentication code */ if(digest_active(n->outdigest)) { - if(!digest_create(n->outdigest, &inpkt->seqno, inpkt->len, &inpkt->seqno + inpkt->len)) { + if(!digest_create(n->outdigest, SEQNO(inpkt), inpkt->len, SEQNO(inpkt) + inpkt->len)) { logger(DEBUG_TRAFFIC, LOG_ERR, "Error while encrypting packet to %s (%s)", n->name, n->hostname); goto end; } @@ -746,7 +762,7 @@ static void send_udppacket(node_t *n, vpn_packet_t *origpkt) { } #endif - if(sendto(listen_socket[sock].udp.fd, &inpkt->seqno, inpkt->len, 0, &sa->sa, SALEN(sa->sa)) < 0 && !sockwouldblock(sockerrno)) { + if(sendto(listen_socket[sock].udp.fd, SEQNO(inpkt), inpkt->len, 0, &sa->sa, SALEN(sa->sa)) < 0 && !sockwouldblock(sockerrno)) { if(sockmsgsize(sockerrno)) { if(n->maxmtu >= origlen) n->maxmtu = origlen - 1; @@ -828,11 +844,11 @@ static bool send_sptps_data_priv(node_t *to, node_t *from, int type, const void return true; } -bool send_sptps_data(void *handle, uint8_t type, const char *data, size_t len) { +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 char *data, uint16_t len) { +bool receive_sptps_record(void *handle, uint8_t type, const void *data, uint16_t len) { node_t *from = handle; if(type == SPTPS_HANDSHAKE) { @@ -850,10 +866,11 @@ bool receive_sptps_record(void *handle, uint8_t type, const char *data, uint16_t } vpn_packet_t inpkt; + inpkt.offset = DEFAULT_PACKET_OFFSET; if(type == PKT_PROBE) { inpkt.len = len; - memcpy(inpkt.data, data, len); + memcpy(DATA(&inpkt), data, len); mtu_probe_h(from, &inpkt, len); return true; } @@ -873,7 +890,7 @@ bool receive_sptps_record(void *handle, uint8_t type, const char *data, uint16_t int offset = (type & PKT_MAC) ? 0 : 14; if(type & PKT_COMPRESSED) { - length_t ulen = uncompress_packet(inpkt.data + offset, (const uint8_t *)data, len, from->incompression); + length_t ulen = uncompress_packet(DATA(&inpkt) + offset, (const uint8_t *)data, len, from->incompression); if(ulen < 0) { return false; } else { @@ -882,25 +899,25 @@ bool receive_sptps_record(void *handle, uint8_t type, const char *data, uint16_t if(inpkt.len > MAXSIZE) abort(); } else { - memcpy(inpkt.data + offset, data, len); + memcpy(DATA(&inpkt) + offset, data, len); inpkt.len = len + offset; } /* Generate the Ethernet packet type if necessary */ if(offset) { - switch(inpkt.data[14] >> 4) { + switch(DATA(&inpkt)[14] >> 4) { case 4: - inpkt.data[12] = 0x08; - inpkt.data[13] = 0x00; + DATA(&inpkt)[12] = 0x08; + DATA(&inpkt)[13] = 0x00; break; case 6: - inpkt.data[12] = 0x86; - inpkt.data[13] = 0xDD; + 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)", - inpkt.data[14] >> 4, from->name, from->hostname); + DATA(&inpkt)[14] >> 4, from->name, from->hostname); return false; } } @@ -917,7 +934,7 @@ void send_packet(node_t *n, vpn_packet_t *packet) { if(n == myself) { if(overwrite_mac) - memcpy(packet->data, mymac.x, ETH_ALEN); + memcpy(DATA(packet), mymac.x, ETH_ALEN); n->out_packets++; n->out_bytes += packet->len; devops.write(packet); @@ -1028,7 +1045,6 @@ static node_t *try_harder(const sockaddr_t *from, const vpn_packet_t *pkt) { void handle_incoming_vpn_data(void *data, int flags) { listen_socket_t *ls = data; vpn_packet_t pkt; - sptps_packet_t *spkt = (sptps_packet_t *)&pkt; char *hostname; node_id_t nullid = {}; sockaddr_t addr = {}; @@ -1036,7 +1052,8 @@ void handle_incoming_vpn_data(void *data, int flags) { node_t *from, *to; bool direct = false; - int len = recvfrom(ls->udp.fd, &pkt.seqno, MAXSIZE, 0, &addr.sa, &addrlen); + pkt.offset = 0; + int len = recvfrom(ls->udp.fd, DATA(&pkt), MAXSIZE, 0, &addr.sa, &addrlen); if(len <= 0 || len > MAXSIZE) { if(!sockwouldblock(sockerrno)) @@ -1054,17 +1071,20 @@ void handle_incoming_vpn_data(void *data, int flags) { if(!n) { // It might be from a 1.1 node, which might have a source ID in the packet. - from = lookup_node_id(&spkt->srcid); - if(from && !memcmp(&spkt->dstid, &nullid, sizeof nullid) && from->status.sptps) { - if(sptps_verify_datagram(&from->sptps, spkt->data, spkt->len - sizeof(spkt->srcid) - sizeof(spkt->dstid))) + 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 goto skip_harder; } } - if(!n) + if(!n) { + pkt.offset = 0; n = try_harder(&addr, &pkt); + } skip_harder: if(!n) { @@ -1077,22 +1097,23 @@ skip_harder: } if(n->status.sptps) { - if(!memcmp(&spkt->dstid, &nullid, sizeof nullid)) { + pkt.offset = 2 * sizeof(node_id_t); + + if(!memcmp(DSTID(&pkt), &nullid, sizeof nullid)) { direct = true; from = n; to = myself; } else { - from = lookup_node_id(&spkt->srcid); - to = lookup_node_id(&spkt->dstid); + 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; } - spkt->len -= sizeof spkt->dstid + sizeof spkt->srcid; if(to != myself) { - send_sptps_data_priv(to, n, 0, spkt->data, spkt->len); + send_sptps_data_priv(to, n, 0, DATA(&pkt), pkt.len - 2 * sizeof(node_id_t)); return; } } else { @@ -1100,6 +1121,7 @@ skip_harder: from = n; } + pkt.offset = 0; if(!receive_udppacket(from, &pkt)) return; @@ -1110,7 +1132,7 @@ skip_harder: void handle_device_data(void *data, int flags) { vpn_packet_t packet; - + packet.offset = DEFAULT_PACKET_OFFSET; packet.priority = 0; if(devops.read(&packet)) { diff --git a/src/protocol_auth.c b/src/protocol_auth.c index cd45deb..47c248d 100644 --- a/src/protocol_auth.c +++ b/src/protocol_auth.c @@ -421,7 +421,7 @@ bool send_metakey(connection_t *c) { if(!(c->outdigest = digest_open_sha1(-1))) return false; - size_t len = rsa_size(c->rsa); + const size_t len = rsa_size(c->rsa); char key[len]; char enckey[len]; char hexkey[2 * len + 1]; @@ -480,7 +480,7 @@ bool send_metakey(connection_t *c) { bool metakey_h(connection_t *c, const char *request) { char hexkey[MAX_STRING_SIZE]; int cipher, digest, maclength, compression; - size_t len = rsa_size(myself->connection->rsa); + const size_t len = rsa_size(myself->connection->rsa); char enckey[len]; char key[len]; @@ -540,7 +540,7 @@ bool metakey_h(connection_t *c, const char *request) { } bool send_challenge(connection_t *c) { - size_t len = rsa_size(c->rsa); + const size_t len = rsa_size(c->rsa); char buffer[len * 2 + 1]; if(!c->hischallenge) @@ -561,7 +561,7 @@ bool send_challenge(connection_t *c) { bool challenge_h(connection_t *c, const char *request) { char buffer[MAX_STRING_SIZE]; - size_t len = rsa_size(myself->connection->rsa); + const size_t len = rsa_size(myself->connection->rsa); size_t digestlen = digest_length(c->indigest); char digest[digestlen]; diff --git a/src/protocol_misc.c b/src/protocol_misc.c index 022438e..713dacf 100644 --- a/src/protocol_misc.c +++ b/src/protocol_misc.c @@ -131,7 +131,7 @@ bool send_tcppacket(connection_t *c, const vpn_packet_t *packet) { if(!send_request(c, "%d %hd", PACKET, packet->len)) return false; - return send_meta(c, (char *)packet->data, packet->len); + return send_meta(c, (char *)DATA(packet), packet->len); } bool tcppacket_h(connection_t *c, const char *request) { diff --git a/src/raw_socket_device.c b/src/raw_socket_device.c index a8c2c86..eb38be2 100644 --- a/src/raw_socket_device.c +++ b/src/raw_socket_device.c @@ -93,7 +93,7 @@ static void close_device(void) { static bool read_packet(vpn_packet_t *packet) { int inlen; - if((inlen = read(device_fd, packet->data, MTU)) <= 0) { + if((inlen = read(device_fd, DATA(packet), MTU)) <= 0) { logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s", device_info, device, strerror(errno)); return false; @@ -111,7 +111,7 @@ static bool write_packet(vpn_packet_t *packet) { logger(DEBUG_TRAFFIC, LOG_DEBUG, "Writing packet of %d bytes to %s", packet->len, device_info); - if(write(device_fd, packet->data, packet->len) < 0) { + if(write(device_fd, DATA(packet), packet->len) < 0) { logger(DEBUG_ALWAYS, LOG_ERR, "Can't write to %s %s: %s", device_info, device, strerror(errno)); return false; diff --git a/src/route.c b/src/route.c index 17f1c71..2785146 100644 --- a/src/route.c +++ b/src/route.c @@ -115,16 +115,16 @@ static void clamp_mss(const node_t *source, const node_t *via, vpn_packet_t *pac /* Find TCP header */ int start = ether_size; - uint16_t type = packet->data[12] << 8 | packet->data[13]; + uint16_t type = DATA(packet)[12] << 8 | DATA(packet)[13]; if(type == ETH_P_8021Q) { start += 4; - type = packet->data[16] << 8 | packet->data[17]; + type = DATA(packet)[16] << 8 | DATA(packet)[17]; } - if(type == ETH_P_IP && packet->data[start + 9] == 6) - start += (packet->data[start] & 0xf) * 4; - else if(type == ETH_P_IPV6 && packet->data[start + 6] == 6) + if(type == ETH_P_IP && DATA(packet)[start + 9] == 6) + start += (DATA(packet)[start] & 0xf) * 4; + else if(type == ETH_P_IPV6 && DATA(packet)[start + 6] == 6) start += 40; else return; @@ -133,38 +133,38 @@ static void clamp_mss(const node_t *source, const node_t *via, vpn_packet_t *pac return; /* Use data offset field to calculate length of options field */ - int len = ((packet->data[start + 12] >> 4) - 5) * 4; + int len = ((DATA(packet)[start + 12] >> 4) - 5) * 4; if(packet->len < start + 20 + len) return; /* Search for MSS option header */ for(int i = 0; i < len;) { - if(packet->data[start + 20 + i] == 0) + if(DATA(packet)[start + 20 + i] == 0) break; - if(packet->data[start + 20 + i] == 1) { + if(DATA(packet)[start + 20 + i] == 1) { i++; continue; } - if(i > len - 2 || i > len - packet->data[start + 21 + i]) + if(i > len - 2 || i > len - DATA(packet)[start + 21 + i]) break; - if(packet->data[start + 20 + i] != 2) { - if(packet->data[start + 21 + i] < 2) + if(DATA(packet)[start + 20 + i] != 2) { + if(DATA(packet)[start + 21 + i] < 2) break; - i += packet->data[start + 21 + i]; + i += DATA(packet)[start + 21 + i]; continue; } - if(packet->data[start + 21] != 4) + if(DATA(packet)[start + 21] != 4) break; /* Found it */ - uint16_t oldmss = packet->data[start + 22 + i] << 8 | packet->data[start + 23 + i]; + uint16_t oldmss = DATA(packet)[start + 22 + i] << 8 | DATA(packet)[start + 23 + i]; uint16_t newmss = mtu - start - 20; - uint16_t csum = packet->data[start + 16] << 8 | packet->data[start + 17]; + uint16_t csum = DATA(packet)[start + 16] << 8 | DATA(packet)[start + 17]; if(oldmss <= newmss) break; @@ -172,23 +172,23 @@ static void clamp_mss(const node_t *source, const node_t *via, vpn_packet_t *pac logger(DEBUG_TRAFFIC, LOG_INFO, "Clamping MSS of packet from %s to %s to %d", source->name, via->name, newmss); /* Update the MSS value and the checksum */ - packet->data[start + 22 + i] = newmss >> 8; - packet->data[start + 23 + i] = newmss & 0xff; + DATA(packet)[start + 22 + i] = newmss >> 8; + DATA(packet)[start + 23 + i] = newmss & 0xff; csum ^= 0xffff; csum -= oldmss; csum += newmss; csum ^= 0xffff; - packet->data[start + 16] = csum >> 8; - packet->data[start + 17] = csum & 0xff; + DATA(packet)[start + 16] = csum >> 8; + DATA(packet)[start + 17] = csum & 0xff; break; } } static void swap_mac_addresses(vpn_packet_t *packet) { mac_t tmp; - memcpy(&tmp, &packet->data[0], sizeof tmp); - memcpy(&packet->data[0], &packet->data[6], sizeof tmp); - memcpy(&packet->data[6], &tmp, sizeof tmp); + memcpy(&tmp, &DATA(packet)[0], sizeof tmp); + memcpy(&DATA(packet)[0], &DATA(packet)[6], sizeof tmp); + memcpy(&DATA(packet)[6], &tmp, sizeof tmp); } static void age_subnets(void *data) { @@ -267,7 +267,7 @@ static void route_ipv4_unreachable(node_t *source, vpn_packet_t *packet, length_ /* Copy headers from packet into properly aligned structs on the stack */ - memcpy(&ip, packet->data + ether_size, ip_size); + memcpy(&ip, DATA(packet) + ether_size, ip_size); /* Remember original source and destination */ @@ -284,7 +284,7 @@ static void route_ipv4_unreachable(node_t *source, vpn_packet_t *packet, length_ /* Copy first part of original contents to ICMP message */ - memmove(packet->data + ether_size + ip_size + icmp_size, packet->data + ether_size, oldlen); + memmove(DATA(packet) + ether_size + ip_size + icmp_size, DATA(packet) + ether_size, oldlen); /* Fill in IPv4 header */ @@ -309,12 +309,12 @@ static void route_ipv4_unreachable(node_t *source, vpn_packet_t *packet, length_ icmp.icmp_cksum = 0; icmp.icmp_cksum = inet_checksum(&icmp, icmp_size, ~0); - icmp.icmp_cksum = inet_checksum(packet->data + ether_size + ip_size + icmp_size, oldlen, icmp.icmp_cksum); + icmp.icmp_cksum = inet_checksum(DATA(packet) + ether_size + ip_size + icmp_size, oldlen, icmp.icmp_cksum); /* Copy structs on stack back to packet */ - memcpy(packet->data + ether_size, &ip, ip_size); - memcpy(packet->data + ether_size + ip_size, &icmp, icmp_size); + memcpy(DATA(packet) + ether_size, &ip, ip_size); + memcpy(DATA(packet) + ether_size + ip_size, &icmp, icmp_size); packet->len = ether_size + ip_size + icmp_size + oldlen; @@ -330,8 +330,9 @@ static void fragment_ipv4_packet(node_t *dest, vpn_packet_t *packet, length_t et uint8_t *offset; uint16_t ip_off, origf; - memcpy(&ip, packet->data + ether_size, ip_size); + memcpy(&ip, DATA(packet) + ether_size, ip_size); fragment.priority = packet->priority; + fragment.offset = DEFAULT_PACKET_OFFSET; if(ip.ip_hl != ip_size / 4) return; @@ -345,7 +346,7 @@ static void fragment_ipv4_packet(node_t *dest, vpn_packet_t *packet, length_t et logger(DEBUG_TRAFFIC, LOG_INFO, "Fragmenting packet of %d bytes to %s (%s)", packet->len, dest->name, dest->hostname); - offset = packet->data + ether_size + ip_size; + offset = DATA(packet) + ether_size + ip_size; maxlen = (dest->mtu - ether_size - ip_size) & ~0x7; ip_off = ntohs(ip.ip_off); origf = ip_off & ~IP_OFFMASK; @@ -353,7 +354,7 @@ static void fragment_ipv4_packet(node_t *dest, vpn_packet_t *packet, length_t et while(todo) { len = todo > maxlen ? maxlen : todo; - memcpy(fragment.data + ether_size + ip_size, offset, len); + memcpy(DATA(&fragment) + ether_size + ip_size, offset, len); todo -= len; offset += len; @@ -361,8 +362,8 @@ static void fragment_ipv4_packet(node_t *dest, vpn_packet_t *packet, length_t et ip.ip_off = htons(ip_off | origf | (todo ? IP_MF : 0)); ip.ip_sum = 0; ip.ip_sum = inet_checksum(&ip, ip_size, ~0); - memcpy(fragment.data, packet->data, ether_size); - memcpy(fragment.data + ether_size, &ip, ip_size); + memcpy(DATA(&fragment), DATA(packet), ether_size); + memcpy(DATA(&fragment) + ether_size, &ip, ip_size); fragment.len = ether_size + ip_size + len; send_packet(dest, &fragment); @@ -379,7 +380,7 @@ static void route_ipv4(node_t *source, vpn_packet_t *packet) { node_t *via; ipv4_t dest; - memcpy(&dest, &packet->data[30], sizeof dest); + memcpy(&dest, &DATA(packet)[30], sizeof dest); subnet = lookup_subnet_ipv4(&dest); if(!subnet) { @@ -411,7 +412,7 @@ static void route_ipv4(node_t *source, vpn_packet_t *packet) { return route_ipv4_unreachable(source, packet, ether_size, ICMP_DEST_UNREACH, ICMP_NET_ANO); if(priorityinheritance) - packet->priority = packet->data[15]; + packet->priority = DATA(packet)[15]; via = (subnet->owner->via == myself) ? subnet->owner->nexthop : subnet->owner->via; @@ -425,7 +426,7 @@ static void route_ipv4(node_t *source, vpn_packet_t *packet) { if(via && packet->len > MAX(via->mtu, 590) && via != myself) { logger(DEBUG_TRAFFIC, LOG_INFO, "Packet for %s (%s) length %d larger than MTU %d", subnet->owner->name, subnet->owner->hostname, packet->len, via->mtu); - if(packet->data[20] & 0x40) { + if(DATA(packet)[20] & 0x40) { packet->len = MAX(via->mtu, 590); route_ipv4_unreachable(source, packet, ether_size, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED); } else { @@ -463,7 +464,7 @@ static void route_ipv6_unreachable(node_t *source, vpn_packet_t *packet, length_ /* Copy headers from packet to structs on the stack */ - memcpy(&ip6, packet->data + ether_size, ip6_size); + memcpy(&ip6, DATA(packet) + ether_size, ip6_size); /* Remember original source and destination */ @@ -480,7 +481,7 @@ static void route_ipv6_unreachable(node_t *source, vpn_packet_t *packet, length_ /* Copy first part of original contents to ICMP message */ - memmove(packet->data + ether_size + ip6_size + icmp6_size, packet->data + ether_size, pseudo.length); + memmove(DATA(packet) + ether_size + ip6_size + icmp6_size, DATA(packet) + ether_size, pseudo.length); /* Fill in IPv6 header */ @@ -506,14 +507,14 @@ static void route_ipv6_unreachable(node_t *source, vpn_packet_t *packet, length_ checksum = inet_checksum(&pseudo, sizeof pseudo, ~0); checksum = inet_checksum(&icmp6, icmp6_size, checksum); - checksum = inet_checksum(packet->data + ether_size + ip6_size + icmp6_size, ntohl(pseudo.length) - icmp6_size, checksum); + checksum = inet_checksum(DATA(packet) + ether_size + ip6_size + icmp6_size, ntohl(pseudo.length) - icmp6_size, checksum); icmp6.icmp6_cksum = checksum; /* Copy structs on stack back to packet */ - memcpy(packet->data + ether_size, &ip6, ip6_size); - memcpy(packet->data + ether_size + ip6_size, &icmp6, icmp6_size); + memcpy(DATA(packet) + ether_size, &ip6, ip6_size); + memcpy(DATA(packet) + ether_size + ip6_size, &icmp6, icmp6_size); packet->len = ether_size + ip6_size + ntohl(pseudo.length); @@ -526,7 +527,7 @@ static void route_ipv6(node_t *source, vpn_packet_t *packet) { if(!checklength(source, packet, ether_size + ip6_size)) return; - if(packet->data[20] == IPPROTO_ICMPV6 && checklength(source, packet, ether_size + ip6_size + icmp6_size) && packet->data[54] == ND_NEIGHBOR_SOLICIT) { + if(DATA(packet)[20] == IPPROTO_ICMPV6 && checklength(source, packet, ether_size + ip6_size + icmp6_size) && DATA(packet)[54] == ND_NEIGHBOR_SOLICIT) { route_neighborsol(source, packet); return; } @@ -535,7 +536,7 @@ static void route_ipv6(node_t *source, vpn_packet_t *packet) { node_t *via; ipv6_t dest; - memcpy(&dest, &packet->data[38], sizeof dest); + memcpy(&dest, &DATA(packet)[38], sizeof dest); subnet = lookup_subnet_ipv6(&dest); if(!subnet) { @@ -621,15 +622,15 @@ static void route_neighborsol(node_t *source, vpn_packet_t *packet) { /* Copy headers from packet to structs on the stack */ - memcpy(&ip6, packet->data + ether_size, ip6_size); - memcpy(&ns, packet->data + ether_size + ip6_size, ns_size); + memcpy(&ip6, DATA(packet) + ether_size, ip6_size); + memcpy(&ns, DATA(packet) + ether_size + ip6_size, ns_size); if(has_opt) - memcpy(&opt, packet->data + ether_size + ip6_size + ns_size, opt_size); + memcpy(&opt, DATA(packet) + ether_size + ip6_size + ns_size, opt_size); /* First, snatch the source address from the neighbor solicitation packet */ if(overwrite_mac) - memcpy(mymac.x, packet->data + ETH_ALEN, ETH_ALEN); + memcpy(mymac.x, DATA(packet) + ETH_ALEN, ETH_ALEN); /* Check if this is a valid neighbor solicitation request */ @@ -655,7 +656,7 @@ static void route_neighborsol(node_t *source, vpn_packet_t *packet) { checksum = inet_checksum(&ns, ns_size, checksum); if(has_opt) { checksum = inet_checksum(&opt, opt_size, checksum); - checksum = inet_checksum(packet->data + ether_size + ip6_size + ns_size + opt_size, ETH_ALEN, checksum); + checksum = inet_checksum(DATA(packet) + ether_size + ip6_size + ns_size + opt_size, ETH_ALEN, checksum); } if(checksum) { @@ -688,14 +689,14 @@ static void route_neighborsol(node_t *source, vpn_packet_t *packet) { /* Create neighbor advertation reply */ - memcpy(packet->data, packet->data + ETH_ALEN, ETH_ALEN); /* copy destination address */ - packet->data[ETH_ALEN * 2 - 1] ^= 0xFF; /* mangle source address so it looks like it's not from us */ + memcpy(DATA(packet), DATA(packet) + ETH_ALEN, ETH_ALEN); /* copy destination address */ + DATA(packet)[ETH_ALEN * 2 - 1] ^= 0xFF; /* mangle source address so it looks like it's not from us */ ip6.ip6_dst = ip6.ip6_src; /* swap destination and source protocoll address */ ip6.ip6_src = ns.nd_ns_target; if(has_opt) - memcpy(packet->data + ether_size + ip6_size + ns_size + opt_size, packet->data + ETH_ALEN, ETH_ALEN); /* add fake source hard addr */ + memcpy(DATA(packet) + ether_size + ip6_size + ns_size + opt_size, DATA(packet) + ETH_ALEN, ETH_ALEN); /* add fake source hard addr */ ns.nd_ns_cksum = 0; ns.nd_ns_type = ND_NEIGHBOR_ADVERT; @@ -718,17 +719,17 @@ static void route_neighborsol(node_t *source, vpn_packet_t *packet) { checksum = inet_checksum(&ns, ns_size, checksum); if(has_opt) { checksum = inet_checksum(&opt, opt_size, checksum); - checksum = inet_checksum(packet->data + ether_size + ip6_size + ns_size + opt_size, ETH_ALEN, checksum); + checksum = inet_checksum(DATA(packet) + ether_size + ip6_size + ns_size + opt_size, ETH_ALEN, checksum); } ns.nd_ns_hdr.icmp6_cksum = checksum; /* Copy structs on stack back to packet */ - memcpy(packet->data + ether_size, &ip6, ip6_size); - memcpy(packet->data + ether_size + ip6_size, &ns, ns_size); + memcpy(DATA(packet) + ether_size, &ip6, ip6_size); + memcpy(DATA(packet) + ether_size + ip6_size, &ns, ns_size); if(has_opt) - memcpy(packet->data + ether_size + ip6_size + ns_size, &opt, opt_size); + memcpy(DATA(packet) + ether_size + ip6_size + ns_size, &opt, opt_size); send_packet(source, packet); } @@ -751,11 +752,11 @@ static void route_arp(node_t *source, vpn_packet_t *packet) { /* First, snatch the source address from the ARP packet */ if(overwrite_mac) - memcpy(mymac.x, packet->data + ETH_ALEN, ETH_ALEN); + memcpy(mymac.x, DATA(packet) + ETH_ALEN, ETH_ALEN); /* Copy headers from packet to structs on the stack */ - memcpy(&arp, packet->data + ether_size, arp_size); + memcpy(&arp, DATA(packet) + ether_size, arp_size); /* Check if this is a valid ARP request */ @@ -781,20 +782,20 @@ static void route_arp(node_t *source, vpn_packet_t *packet) { if(subnet->owner == myself) return; /* silently ignore */ - memcpy(packet->data, packet->data + ETH_ALEN, ETH_ALEN); /* copy destination address */ - packet->data[ETH_ALEN * 2 - 1] ^= 0xFF; /* mangle source address so it looks like it's not from us */ + memcpy(DATA(packet), DATA(packet) + ETH_ALEN, ETH_ALEN); /* copy destination address */ + DATA(packet)[ETH_ALEN * 2 - 1] ^= 0xFF; /* mangle source address so it looks like it's not from us */ memcpy(&addr, arp.arp_tpa, sizeof addr); /* save protocol addr */ memcpy(arp.arp_tpa, arp.arp_spa, sizeof addr); /* swap destination and source protocol address */ memcpy(arp.arp_spa, &addr, sizeof addr); /* ... */ memcpy(arp.arp_tha, arp.arp_sha, ETH_ALEN); /* set target hard/proto addr */ - memcpy(arp.arp_sha, packet->data + ETH_ALEN, ETH_ALEN); /* add fake source hard addr */ + memcpy(arp.arp_sha, DATA(packet) + ETH_ALEN, ETH_ALEN); /* add fake source hard addr */ arp.arp_op = htons(ARPOP_REPLY); /* Copy structs on stack back to packet */ - memcpy(packet->data + ether_size, &arp, arp_size); + memcpy(DATA(packet) + ether_size, &arp, arp_size); send_packet(source, packet); } @@ -807,13 +808,13 @@ static void route_mac(node_t *source, vpn_packet_t *packet) { if(source == myself) { mac_t src; - memcpy(&src, &packet->data[6], sizeof src); + memcpy(&src, &DATA(packet)[6], sizeof src); learn_mac(&src); } /* Lookup destination address */ - memcpy(&dest, &packet->data[0], sizeof dest); + memcpy(&dest, &DATA(packet)[0], sizeof dest); subnet = lookup_subnet_mac(NULL, &dest); if(!subnet || !subnet->owner) { @@ -829,10 +830,10 @@ static void route_mac(node_t *source, vpn_packet_t *packet) { if(forwarding_mode == FMODE_OFF && source != myself && subnet->owner != myself) return; - uint16_t type = packet->data[12] << 8 | packet->data[13]; + uint16_t type = DATA(packet)[12] << 8 | DATA(packet)[13]; if(priorityinheritance && type == ETH_P_IP && packet->len >= ether_size + ip_size) - packet->priority = packet->data[15]; + packet->priority = DATA(packet)[15]; // Handle packets larger than PMTU @@ -846,12 +847,12 @@ static void route_mac(node_t *source, vpn_packet_t *packet) { length_t ethlen = 14; if(type == ETH_P_8021Q) { - type = packet->data[16] << 8 | packet->data[17]; + type = DATA(packet)[16] << 8 | DATA(packet)[17]; ethlen += 4; } if(type == ETH_P_IP && packet->len > 576 + ethlen) { - if(packet->data[6 + ethlen] & 0x40) { + if(DATA(packet)[6 + ethlen] & 0x40) { packet->len = via->mtu; route_ipv4_unreachable(source, packet, ethlen, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED); } else { @@ -883,16 +884,16 @@ static void send_pcap(vpn_packet_t *packet) { len = c->outmaclength; if(send_request(c, "%d %d %d", CONTROL, REQ_PCAP, len)) - send_meta(c, (char *)packet->data, len); + send_meta(c, (char *)DATA(packet), len); } } static bool do_decrement_ttl(node_t *source, vpn_packet_t *packet) { - uint16_t type = packet->data[12] << 8 | packet->data[13]; + uint16_t type = DATA(packet)[12] << 8 | DATA(packet)[13]; length_t ethlen = ether_size; if(type == ETH_P_8021Q) { - type = packet->data[16] << 8 | packet->data[17]; + type = DATA(packet)[16] << 8 | DATA(packet)[17]; ethlen += 4; } @@ -901,22 +902,22 @@ static bool do_decrement_ttl(node_t *source, vpn_packet_t *packet) { if(!checklength(source, packet, ethlen + ip_size)) return false; - if(packet->data[ethlen + 8] < 1) { - if(packet->data[ethlen + 11] != IPPROTO_ICMP || packet->data[ethlen + 32] != ICMP_TIME_EXCEEDED) + if(DATA(packet)[ethlen + 8] < 1) { + if(DATA(packet)[ethlen + 11] != IPPROTO_ICMP || DATA(packet)[ethlen + 32] != ICMP_TIME_EXCEEDED) route_ipv4_unreachable(source, packet, ethlen, ICMP_TIME_EXCEEDED, ICMP_EXC_TTL); return false; } - uint16_t old = packet->data[ethlen + 8] << 8 | packet->data[ethlen + 9]; - packet->data[ethlen + 8]--; - uint16_t new = packet->data[ethlen + 8] << 8 | packet->data[ethlen + 9]; + uint16_t old = DATA(packet)[ethlen + 8] << 8 | DATA(packet)[ethlen + 9]; + DATA(packet)[ethlen + 8]--; + uint16_t new = DATA(packet)[ethlen + 8] << 8 | DATA(packet)[ethlen + 9]; - uint32_t checksum = packet->data[ethlen + 10] << 8 | packet->data[ethlen + 11]; + uint32_t checksum = DATA(packet)[ethlen + 10] << 8 | DATA(packet)[ethlen + 11]; checksum += old + (~new & 0xFFFF); while(checksum >> 16) checksum = (checksum & 0xFFFF) + (checksum >> 16); - packet->data[ethlen + 10] = checksum >> 8; - packet->data[ethlen + 11] = checksum & 0xff; + DATA(packet)[ethlen + 10] = checksum >> 8; + DATA(packet)[ethlen + 11] = checksum & 0xff; return true; @@ -924,13 +925,13 @@ static bool do_decrement_ttl(node_t *source, vpn_packet_t *packet) { if(!checklength(source, packet, ethlen + ip6_size)) return false; - if(packet->data[ethlen + 7] < 1) { - if(packet->data[ethlen + 6] != IPPROTO_ICMPV6 || packet->data[ethlen + 40] != ICMP6_TIME_EXCEEDED) + if(DATA(packet)[ethlen + 7] < 1) { + if(DATA(packet)[ethlen + 6] != IPPROTO_ICMPV6 || DATA(packet)[ethlen + 40] != ICMP6_TIME_EXCEEDED) route_ipv6_unreachable(source, packet, ethlen, ICMP6_TIME_EXCEEDED, ICMP6_TIME_EXCEED_TRANSIT); return false; } - packet->data[ethlen + 7]--; + DATA(packet)[ethlen + 7]--; return true; @@ -955,7 +956,7 @@ void route(node_t *source, vpn_packet_t *packet) { if(!do_decrement_ttl(source, packet)) return; - uint16_t type = packet->data[12] << 8 | packet->data[13]; + uint16_t type = DATA(packet)[12] << 8 | DATA(packet)[13]; switch (routing_mode) { case RMODE_ROUTER: diff --git a/src/solaris/device.c b/src/solaris/device.c index a4c0d27..fadae57 100644 --- a/src/solaris/device.c +++ b/src/solaris/device.c @@ -2,7 +2,7 @@ device.c -- Interaction with Solaris tun device Copyright (C) 2001-2005 Ivo Timmermans, 2002-2010 OpenVPN Technologies, Inc. - 2001-2013 Guus Sliepen + 2001-2014 Guus Sliepen This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -299,31 +299,31 @@ static bool read_packet(vpn_packet_t *packet) { switch(device_type) { case DEVICE_TYPE_TUN: - if((inlen = read(device_fd, packet->data + 14, MTU - 14)) <= 0) { + if((inlen = read(device_fd, DATA(packet) + 14, MTU - 14)) <= 0) { logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s", device_info, device, strerror(errno)); return false; } - switch(packet->data[14] >> 4) { + switch(DATA(packet)[14] >> 4) { case 4: - packet->data[12] = 0x08; - packet->data[13] = 0x00; + DATA(packet)[12] = 0x08; + DATA(packet)[13] = 0x00; break; case 6: - packet->data[12] = 0x86; - packet->data[13] = 0xDD; + DATA(packet)[12] = 0x86; + DATA(packet)[13] = 0xDD; break; default: - logger(DEBUG_TRAFFIC, LOG_ERR, "Unknown IP version %d while reading packet from %s %s", packet->data[14] >> 4, device_info, device); + logger(DEBUG_TRAFFIC, LOG_ERR, "Unknown IP version %d while reading packet from %s %s", DATA(packet)[14] >> 4, device_info, device); return false; } - memset(packet->data, 0, 12); + memset(DATA(packet), 0, 12); packet->len = inlen + 14; break; case DEVICE_TYPE_TAP: - if((inlen = read(device_fd, packet->data, MTU)) <= 0) { + if((inlen = read(device_fd, DATA(packet), MTU)) <= 0) { logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s", device_info, device, strerror(errno)); return false; } @@ -345,14 +345,14 @@ static bool write_packet(vpn_packet_t *packet) { switch(device_type) { case DEVICE_TYPE_TUN: - if(write(device_fd, packet->data + 14, packet->len - 14) < 0) { + if(write(device_fd, DATA(packet) + 14, packet->len - 14) < 0) { logger(DEBUG_ALWAYS, LOG_ERR, "Can't write to %s %s: %s", device_info, device, strerror(errno)); return false; } break; case DEVICE_TYPE_TAP: - if(write(device_fd, packet->data, packet->len) < 0) { + if(write(device_fd, DATA(packet), packet->len) < 0) { logger(DEBUG_ALWAYS, LOG_ERR, "Can't write to %s %s: %s", device_info, device, strerror(errno)); return false; } diff --git a/src/uml_device.c b/src/uml_device.c index f2b52cb..57d4843 100644 --- a/src/uml_device.c +++ b/src/uml_device.c @@ -244,7 +244,7 @@ static bool read_packet(vpn_packet_t *packet) { } case 2: { - if((inlen = read(data_fd, packet->data, MTU)) <= 0) { + if((inlen = read(data_fd, DATA(packet), MTU)) <= 0) { logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s", device_info, device, strerror(errno)); event_exit(); @@ -275,7 +275,7 @@ static bool write_packet(vpn_packet_t *packet) { logger(DEBUG_TRAFFIC, LOG_DEBUG, "Writing packet of %d bytes to %s", packet->len, device_info); - if(write(write_fd, packet->data, packet->len) < 0) { + if(write(write_fd, DATA(packet), packet->len) < 0) { if(errno != EINTR && errno != EAGAIN) { logger(DEBUG_ALWAYS, LOG_ERR, "Can't write to %s %s: %s", device_info, device, strerror(errno)); event_exit(); diff --git a/src/vde_device.c b/src/vde_device.c index 55d66b4..73ad713 100644 --- a/src/vde_device.c +++ b/src/vde_device.c @@ -97,7 +97,7 @@ static void close_device(void) { } static bool read_packet(vpn_packet_t *packet) { - int lenin = (ssize_t)plug.vde_recv(conn, packet->data, MTU, 0); + int lenin = (ssize_t)plug.vde_recv(conn, DATA(packet), MTU, 0); if(lenin <= 0) { logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s", device_info, device, strerror(errno)); event_exit(); @@ -112,7 +112,7 @@ static bool read_packet(vpn_packet_t *packet) { } static bool write_packet(vpn_packet_t *packet) { - if((ssize_t)plug.vde_send(conn, packet->data, packet->len, 0) < 0) { + if((ssize_t)plug.vde_send(conn, DATA(packet), packet->len, 0) < 0) { if(errno != EINTR && errno != EAGAIN) { logger(DEBUG_ALWAYS, LOG_ERR, "Can't write to %s %s: %s", device_info, device, strerror(errno)); event_exit(); -- 2.25.1