1 // SPDX-License-Identifier: BSD-2-Clause
3 * Copyright (C) 2016 The Android Open Source Project
10 #include <net/fastboot_udp.h>
16 FASTBOOT_FASTBOOT = 3,
19 struct __packed fastboot_header {
25 #define PACKET_SIZE 1024
26 #define DATA_SIZE (PACKET_SIZE - sizeof(struct fastboot_header))
28 /* Sequence number sent for every packet */
29 static unsigned short sequence_number = 1;
30 static const unsigned short packet_size = PACKET_SIZE;
31 static const unsigned short udp_version = 1;
33 /* Keep track of last packet for resubmission */
34 static uchar last_packet[PACKET_SIZE];
35 static unsigned int last_packet_len;
37 static struct in_addr fastboot_remote_ip;
38 /* The UDP port at their end */
39 static int fastboot_remote_port;
40 /* The UDP port at our end */
41 static int fastboot_our_port;
44 * fastboot_udp_send_info() - Send an INFO packet during long commands.
46 * @msg: String describing the reason for waiting
48 static void fastboot_udp_send_info(const char *msg)
53 char response[FASTBOOT_RESPONSE_LEN] = {0};
55 struct fastboot_header response_header = {
56 .id = FASTBOOT_FASTBOOT,
58 .seq = htons(sequence_number)
61 packet = net_tx_packet + net_eth_hdr_size() + IP_UDP_HDR_SIZE;
65 memcpy(packet, &response_header, sizeof(response_header));
66 packet += sizeof(response_header);
68 fastboot_response("INFO", response, "%s", msg);
69 memcpy(packet, response, strlen(response));
70 packet += strlen(response);
72 len = packet - packet_base;
74 /* Save packet for retransmitting */
75 last_packet_len = len;
76 memcpy(last_packet, packet_base, last_packet_len);
78 net_send_udp_packet(net_server_ethaddr, fastboot_remote_ip,
79 fastboot_remote_port, fastboot_our_port, len);
83 * fastboot_timed_send_info() - Send INFO packet every 30 seconds
85 * @msg: String describing the reason for waiting
87 * Send an INFO packet during long commands based on timer. An INFO packet
88 * is sent if the time is 30 seconds after start. Else, noop.
90 static void fastboot_timed_send_info(const char *msg)
94 /* Initialize timer */
97 ulong time = get_timer(start);
98 /* Send INFO packet to host every 30 seconds */
100 start = get_timer(0);
101 fastboot_udp_send_info(msg);
106 * fastboot_send() - Sends a packet in response to received fastboot packet
108 * @header: Header for response packet
109 * @fastboot_data: Pointer to received fastboot data
110 * @fastboot_data_len: Length of received fastboot data
111 * @retransmit: Nonzero if sending last sent packet
113 static void fastboot_send(struct fastboot_header header, char *fastboot_data,
114 unsigned int fastboot_data_len, uchar retransmit)
119 const char *error_msg = "An error occurred.";
121 struct fastboot_header response_header = header;
122 static char command[FASTBOOT_COMMAND_LEN];
124 static bool pending_command;
125 char response[FASTBOOT_RESPONSE_LEN] = {0};
128 * We will always be sending some sort of packet, so
129 * cobble together the packet headers now.
131 packet = net_tx_packet + net_eth_hdr_size() + IP_UDP_HDR_SIZE;
132 packet_base = packet;
134 /* Resend last packet */
136 memcpy(packet, last_packet, last_packet_len);
137 net_send_udp_packet(net_server_ethaddr, fastboot_remote_ip,
138 fastboot_remote_port, fastboot_our_port,
143 response_header.seq = htons(response_header.seq);
144 memcpy(packet, &response_header, sizeof(response_header));
145 packet += sizeof(response_header);
149 tmp = htons(sequence_number);
150 memcpy(packet, &tmp, sizeof(tmp));
151 packet += sizeof(tmp);
154 tmp = htons(udp_version);
155 memcpy(packet, &tmp, sizeof(tmp));
156 packet += sizeof(tmp);
157 tmp = htons(packet_size);
158 memcpy(packet, &tmp, sizeof(tmp));
159 packet += sizeof(tmp);
162 memcpy(packet, error_msg, strlen(error_msg));
163 packet += strlen(error_msg);
165 case FASTBOOT_FASTBOOT:
166 if (cmd == FASTBOOT_COMMAND_DOWNLOAD) {
167 if (!fastboot_data_len && !fastboot_data_remaining()) {
168 fastboot_data_complete(response);
170 fastboot_data_download(fastboot_data,
174 } else if (!pending_command) {
175 strlcpy(command, fastboot_data,
176 min((size_t)fastboot_data_len + 1,
178 pending_command = true;
180 cmd = fastboot_handle_command(command, response);
181 pending_command = false;
184 * Sent some INFO packets, need to update sequence number in
187 if (header.seq != sequence_number) {
188 response_header.seq = htons(sequence_number);
189 memcpy(packet_base, &response_header,
190 sizeof(response_header));
192 /* Write response to packet */
193 memcpy(packet, response, strlen(response));
194 packet += strlen(response);
197 pr_err("ID %d not implemented.\n", header.id);
201 len = packet - packet_base;
203 /* Save packet for retransmitting */
204 last_packet_len = len;
205 memcpy(last_packet, packet_base, last_packet_len);
207 net_send_udp_packet(net_server_ethaddr, fastboot_remote_ip,
208 fastboot_remote_port, fastboot_our_port, len);
210 fastboot_handle_boot(cmd, strncmp("OKAY", response, 4) == 0);
212 if (!strncmp("OKAY", response, 4) || !strncmp("FAIL", response, 4))
217 * fastboot_handler() - Incoming UDP packet handler.
219 * @packet: Pointer to incoming UDP packet
220 * @dport: Destination UDP port
221 * @sip: Source IP address
222 * @sport: Source UDP port
223 * @len: Packet length
225 static void fastboot_handler(uchar *packet, unsigned int dport,
226 struct in_addr sip, unsigned int sport,
229 struct fastboot_header header;
230 char fastboot_data[DATA_SIZE] = {0};
231 unsigned int fastboot_data_len = 0;
233 if (dport != fastboot_our_port)
236 fastboot_remote_ip = sip;
237 fastboot_remote_port = sport;
239 if (len < sizeof(struct fastboot_header) || len > PACKET_SIZE)
241 memcpy(&header, packet, sizeof(header));
243 header.seq = ntohs(header.seq);
244 packet += sizeof(header);
245 len -= sizeof(header);
249 fastboot_send(header, fastboot_data, 0, 0);
252 case FASTBOOT_FASTBOOT:
253 fastboot_data_len = len;
255 memcpy(fastboot_data, packet, len);
256 if (header.seq == sequence_number) {
257 fastboot_send(header, fastboot_data,
258 fastboot_data_len, 0);
260 } else if (header.seq == sequence_number - 1) {
261 /* Retransmit last sent packet */
262 fastboot_send(header, fastboot_data,
263 fastboot_data_len, 1);
267 pr_err("ID %d not implemented.\n", header.id);
268 header.id = FASTBOOT_ERROR;
269 fastboot_send(header, fastboot_data, 0, 0);
274 void fastboot_udp_start_server(void)
276 printf("Using %s device\n", eth_get_name());
277 printf("Listening for fastboot command on %pI4\n", &net_ip);
279 fastboot_our_port = CONFIG_UDP_FUNCTION_FASTBOOT_PORT;
281 if (IS_ENABLED(CONFIG_FASTBOOT_FLASH))
282 fastboot_set_progress_callback(fastboot_timed_send_info);
284 net_set_udp_handler(fastboot_handler);
286 /* zero out server ether in case the server ip has changed */
287 memset(net_server_ethaddr, 0, 6);