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darwin rawnet - since the MAC address can't change, switch it with Uthernet's mac address. Unfortunately, dhcp requests include a mac address, so it also has to be swapped in the DHCP message.
This commit is contained in:
Kelvin Sherlock
parent
9370ed8604
commit
b98635aaf1
@ -20,6 +20,7 @@ static const uint8_t broadcast_mac[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
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static interface_ref interface;
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static uint8_t interface_mac[6];
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static uint8_t interface_fake_mac[6];
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static uint64_t interface_mtu;
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static uint64_t interface_packet_size;
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static vmnet_return_t interface_status;
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@ -49,6 +50,7 @@ int rawnet_arch_activate(const char *interface_name) {
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*/
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memset(interface_mac, 0, sizeof(interface_mac));
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memset(interface_fake_mac, 0, sizeof(interface_fake_mac));
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interface_status = 0;
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interface_mtu = 0;
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interface_packet_size = 0;
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@ -124,7 +126,11 @@ void rawnet_arch_deactivate(void) {
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}
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void rawnet_arch_set_mac(const uint8_t mac[6]) {
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/* NOP */
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#ifdef RAWNET_DEBUG_ARCH
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log_message( rawnet_arch_log, "New MAC address set: %02X:%02X:%02X:%02X:%02X:%02X.", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5] );
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#endif
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memcpy(interface_fake_mac, mac, 6);
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}
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void rawnet_arch_set_hashfilter(const uint32_t hash_mask[2]) {
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/* NOP */
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@ -138,12 +144,213 @@ void rawnet_arch_line_ctl(int bEnableTransmitter, int bEnableReceiver) {
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/* NOP */
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}
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enum {
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eth_dest = 0, // destination address
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eth_src = 6, // source address
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eth_type = 12, // packet type
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eth_data = 14, // packet data
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};
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enum {
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ip_ver_ihl = 0,
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ip_tos = 1,
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ip_len = 2,
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ip_id = 4,
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ip_frag = 6,
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ip_ttl = 8,
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ip_proto = 9,
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ip_header_cksum = 10,
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ip_src = 12,
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ip_dest = 16,
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ip_data = 20,
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};
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enum {
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udp_source = 0, // source port
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udp_dest = 2, // destination port
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udp_len = 4, // length
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udp_cksum = 6, // checksum
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udp_data = 8, // total length udp header
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};
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enum {
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bootp_op = 0, // operation
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bootp_hw = 1, // hardware type
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bootp_hlen = 2, // hardware len
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bootp_hp = 3, // hops
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bootp_transid = 4, // transaction id
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bootp_secs = 8, // seconds since start
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bootp_flags = 10, // flags
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bootp_ipaddr = 12, // ip address knwon by client
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bootp_ipclient = 16, // client ip from server
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bootp_ipserver = 20, // server ip
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bootp_ipgateway = 24, // gateway ip
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bootp_client_hrd = 28, // client mac address
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bootp_spare = 34,
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bootp_host = 44,
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bootp_fname = 108,
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bootp_data = 236, // total length bootp packet
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};
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enum {
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arp_hw = 14, // hw type (eth = 0001)
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arp_proto = 16, // protocol (ip = 0800)
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arp_hwlen = 18, // hw addr len (eth = 06)
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arp_protolen = 19, // proto addr len (ip = 04)
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arp_op = 20, // request = 0001, reply = 0002
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arp_shw = 22, // sender hw addr
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arp_sp = 28, // sender proto addr
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arp_thw = 32, // target hw addr
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arp_tp = 38, // target protoaddr
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arp_data = 42, // total length of packet
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};
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enum {
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dhcp_discover = 1,
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dhcp_offer = 2,
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dhcp_request = 3,
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dhcp_decline = 4,
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dhcp_pack = 5,
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dhcp_nack = 6,
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dhcp_release = 7,
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dhcp_inform = 8,
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};
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static uint8_t oo[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
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static uint8_t ff[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
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static int is_arp(const uint8_t *packet, unsigned size) {
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return size == arp_data
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&& packet[12] == 0x08 && packet[13] == 0x06 /* ARP */
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&& packet[14] == 0x00 && packet[15] == 0x01 /* ethernet */
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&& packet[16] == 0x08 && packet[17] == 0x00 /* ipv4 */
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&& packet[18] == 0x06 /* hardware size */
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&& packet[19] == 0x04 /* protocol size */
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;
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}
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static int is_broadcast(const uint8_t *packet, unsigned size) {
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return !memcmp(packet + 0, ff, 6);
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}
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static int is_unicast(const uint8_t *packet, unsigned size) {
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return (*packet & 0x01) == 0;
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}
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static int is_multicast(const uint8_t *packet, unsigned size) {
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return (*packet & 0x01) == 0x01 && !is_broadcast(packet, size);
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}
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static int is_dhcp_out(const uint8_t *packet, unsigned size) {
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static uint8_t cookie[] = { 0x63, 0x82, 0x53, 0x63 };
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return size >= 282
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//&& !memcmp(&packet[0], ff, 6) /* broadcast */
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&& packet[12] == 0x08 && packet[13] == 0x00
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&& packet[14] == 0x45 /* version 4 */
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&& packet[23] == 0x11 /* UDP */
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//&& !memcmp(&packet[26], oo, 4) /* source ip */
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//&& !memcmp(&packet[30], ff, 4) /* dest ip */
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&& packet[34] == 0x00 && packet[35] == 0x44 /* source port */
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&& packet[36] == 0x00 && packet[37] == 0x43 /* dest port */
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//&& packet[44] == 0x01 /* dhcp boot req */
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&& packet[43] == 0x01 /* ethernet */
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&& packet[44] == 0x06 /* 6 byte mac */
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&& !memcmp(&packet[278], cookie, 4)
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;
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}
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static int is_dhcp_in(const uint8_t *packet, unsigned size) {
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static uint8_t cookie[] = { 0x63, 0x82, 0x53, 0x63 };
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return size >= 282
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//&& !memcmp(&packet[0], ff, 6) /* broadcast */
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&& packet[12] == 0x08 && packet[13] == 0x00
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&& packet[14] == 0x45 /* version 4 */
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&& packet[23] == 0x11 /* UDP */
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//&& !memcmp(&packet[26], oo, 4) /* source ip */
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//&& !memcmp(&packet[30], ff, 4) /* dest ip */
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&& packet[34] == 0x00 && packet[35] == 0x43 /* source port */
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&& packet[36] == 0x00 && packet[37] == 0x44 /* dest port */
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//&& packet[44] == 0x01 /* dhcp boot req */
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&& packet[43] == 0x01 /* ethernet */
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&& packet[44] == 0x06 /* 6 byte mac */
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&& !memcmp(&packet[278], cookie, 4)
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;
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}
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static unsigned ip_checksum(const uint8_t *packet) {
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unsigned x = 0;
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unsigned i;
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for (i = 0; i < ip_data; i += 2) {
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if (i == ip_header_cksum) continue;
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x += packet[eth_data + i + 0 ] << 8;
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x += packet[eth_data + i + 1];
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}
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/* add the carry */
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x += x >> 16;
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x &= 0xffff;
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return ~x & 0xffff;
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}
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static void fix_incoming_packet(uint8_t *packet, unsigned size, const uint8_t real_mac[6], const uint8_t fake_mac[6]) {
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if (memcmp(packet + 0, real_mac, 6) == 0)
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memcpy(packet + 0, fake_mac, 6);
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/* dhcp request - fix the hardware address */
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if (is_unicast(packet, size) && is_dhcp_in(packet, size)) {
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if (!memcmp(packet + 70, real_mac, 6))
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memcpy(packet + 70, fake_mac, 6);
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return;
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}
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}
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static void fix_outgoing_packet(uint8_t *packet, unsigned size, const uint8_t real_mac[6], const uint8_t fake_mac[6]) {
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if (memcmp(packet + 6, fake_mac, 6) == 0)
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memcpy(packet + 6, real_mac, 6);
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if (is_arp(packet, size)) {
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/* sender mac address */
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if (!memcmp(packet + 22, fake_mac, 6))
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memcpy(packet + 22, real_mac, 6);
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return;
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}
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/* dhcp request - fix the hardware address */
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if (is_broadcast(packet, size) && is_dhcp_out(packet, size)) {
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/* set source ip to 0 - LL bug? */
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/* fixed in link layer as of 2018-12-17 */
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#if 0
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unsigned ck;
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memset(packet + 26, 0, 4);
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ck = ip_checksum(packet);
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packet[eth_data + ip_header_cksum + 0] = ck >> 8;
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packet[eth_data + ip_header_cksum + 1] = ck;
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#endif
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if (!memcmp(packet + 70, fake_mac, 6))
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memcpy(packet + 70, real_mac, 6);
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return;
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}
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}
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void rawnet_arch_transmit(int force, int onecoll, int inhibit_crc, int tx_pad_dis, int txlength, uint8_t *txframe) {
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int count = 1;
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vmnet_return_t st;
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struct vmpktdesc v;
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struct iovec iov;
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uint8_t *buffer;
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if (txlength == 0) return;
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if (txlength > interface_packet_size) {
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@ -151,8 +358,17 @@ void rawnet_arch_transmit(int force, int onecoll, int inhibit_crc, int tx_pad_di
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return;
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}
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if (txlength < 12) {
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log_message(rawnet_arch_log, "packet is too small: %d", txlength);
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return;
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}
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iov.iov_base = txframe;
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/* copy the buffer and fix the source mac address. */
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buffer = (uint8_t *)calloc(txlength, 1);
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memcpy(buffer, txframe, txlength);
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fix_outgoing_packet(buffer, txlength, interface_mac, interface_fake_mac);
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iov.iov_base = buffer;
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iov.iov_len = txlength;
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v.vm_pkt_size = txlength;
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@ -161,11 +377,12 @@ void rawnet_arch_transmit(int force, int onecoll, int inhibit_crc, int tx_pad_di
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v.vm_flags = 0;
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fprintf(stderr, "\rawnet_arch_transmit: %u\n", (unsigned)iov.iov_len);
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rawnet_hexdump(iov.iov_base, iov.iov_len);
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fprintf(stderr, "\nrawnet_arch_transmit: %u\n", (unsigned)iov.iov_len);
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rawnet_hexdump(buffer, v.vm_pkt_size);
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st = vmnet_write(interface, &v, &count);
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free(buffer);
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if (st != VMNET_SUCCESS) {
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log_message(rawnet_arch_log, "vmnet_write failed!");
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}
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@ -174,7 +391,7 @@ void rawnet_arch_transmit(int force, int onecoll, int inhibit_crc, int tx_pad_di
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int rawnet_arch_receive(uint8_t *pbuffer, int *plen, int *phashed, int *phash_index, int *prx_ok, int *pcorrect_mac, int *pbroadcast, int *pcrc_error) {
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char *buffer;
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uint8_t *buffer;
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//unsigned hashreg;
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int count = 1;
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@ -184,7 +401,7 @@ int rawnet_arch_receive(uint8_t *pbuffer, int *plen, int *phashed, int *phash_in
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struct iovec iov;
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buffer = calloc(interface_packet_size, 1);
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buffer = (uint8_t *)calloc(interface_packet_size, 1);
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iov.iov_base = buffer;
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iov.iov_len = interface_packet_size;
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@ -206,9 +423,13 @@ int rawnet_arch_receive(uint8_t *pbuffer, int *plen, int *phashed, int *phash_in
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return 0;
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}
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fix_incoming_packet(buffer, v.vm_pkt_size, interface_mac, interface_fake_mac);
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// iov.iov_len is not updated with the read count, apparently.
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if (!is_multicast(buffer, v.vm_pkt_size)) { /* multicast crap */
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fprintf(stderr, "\nrawnet_arch_receive: %u\n", (unsigned)v.vm_pkt_size);
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rawnet_hexdump(iov.iov_base, v.vm_pkt_size);
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rawnet_hexdump(buffer, v.vm_pkt_size);
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}
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xfer = v.vm_pkt_size;
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if (xfer > *plen) xfer = *plen;
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@ -225,8 +446,10 @@ int rawnet_arch_receive(uint8_t *pbuffer, int *plen, int *phashed, int *phash_in
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*pcrc_error = 0;
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*prx_ok = 1;
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#if 0
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*pcorrect_mac = memcmp(buffer, interface_mac, 6) == 0;
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*pbroadcast = memcmp(buffer, broadcast_mac, 6) == 0;
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#endif
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/* vmnet won't send promiscuous packets */
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#if 0
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