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annotate rvinterf/include/localsock.h @ 1034:405b5469abc4 default tip

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author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 12 Jun 2016 19:06:34 +0000
parents a5c8f48003cd
children
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1 /*
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2 * This header defines and describes (through comments) the local UNIX domain
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3 * socket interface implemented between rvinterf and its clients like fc-tmsh.
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4 *
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5 * The UNIX domain sockets used for this ad hoc interface are of the
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6 * SOCK_STREAM kind, but the true nature of the communication is message-based.
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7 * We use the same trick that is used for DNS over TCP: every message in each
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8 * direction is preceded by a 2-byte length. This length is sent MSB first
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9 * just like in DNS over TCP. The limit on the size of these messages
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10 * (for sizing buffers etc) is:
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11 */
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12
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13 #define LOCALSOCK_MAX_MSG 1024
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14
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15 /*
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16 * Each message in the client->rvinterf direction (can be seen as command)
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17 * begins (after the length) with an opcode byte as follows:
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18 */
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19
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20 #define CLI2RVI_WANT_RVTRACE 0x00
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21 #define CLI2RVI_WANT_MUXPROTO 0x01
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22 #define CLI2RVI_PKT_TO_TARGET 0x02
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23 #define CLI2RVI_RAWBYTES_TO_TARGET 0x03
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24 #define CLI2RVI_RESET_PACKET_RX 0x04
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25 #define CLI2RVI_DROP_MUXPROTO 0x05
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26
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27 /*
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28 * The first two commands (CLI2RVI_WANT_RVTRACE and CLI2RVI_WANT_MUXPROTO)
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29 * are the means by which client programs inform rvinterf that they are
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30 * interested in receiving copies of certain packets coming from the target.
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31 *
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32 * The CLI2RVI_WANT_RVTRACE opcode needs to be followed by a USEID mask value
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33 * and a USEID match value, both in the network byte order, i.e., MSB first,
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34 * for a total message length of 9 bytes. For every RV trace message received
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35 * from the target, rvinterf will iterate through all active clients to see who
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36 * is interested: if the received USEID ANDed with the mask equals the match
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37 * value, the message will be forwarded to that client.
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38 *
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39 * The CLI2RVI_WANT_MUXPROTO opcode needs to be followed by one byte
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40 * identifying the RVTMUX protocol of interest, i.e., the first byte of the
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41 * packets exchanged between the host and the target, e.g., 0x12 for L1 traces
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42 * as defined in pktmux.h, for a total message length of 2 bytes.
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43 *
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44 * The CLI2RVI_RESET_PACKET_RX opcode resets the "interests" previously set
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45 * with CLI2RVI_WANT_RVTRACE and/or CLI2RVI_WANT_MUXPROTO. It is a "blanket"
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46 * reset; the command message consists of just the opcode. The
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47 * CLI2RVI_DROP_MUXPROTO command is more specific and undoes the effect of a
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48 * previous CLI2RVI_WANT_MUXPROTO; it needs to be followed by one byte
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49 * identifying the RVTMUX protocol in question, just like CLI2RVI_WANT_MUXPROTO.
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50 *
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51 * The last two commands (CLI2RVI_PKT_TO_TARGET and CLI2RVI_RAWBYTES_TO_TARGET)
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52 * cause data payload to be sent to the target serial port. Payload following
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53 * CLI2RVI_PKT_TO_TARGET (must not exceed MAX_PKT_TO_TARGET) is sent with the
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54 * proper packet encapsulation per TI; bytes following
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55 * CLI2RVI_RAWBYTES_TO_TARGET are sent raw.
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56 */
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57
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58 /*
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59 * Each message in the rvinterf->client direction begins (after the length)
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60 * with a message type byte as follows:
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61 */
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62
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63 #define RVI2CLI_PKT_FROM_TARGET 0x00
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64 #define RVI2CLI_LOCAL_CMD_RESP 0x01
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65
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66 /*
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67 * Messages beginning with RVI2CLI_PKT_FROM_TARGET are packets received
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68 * from the target GSM device; the byte following this type code is the
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69 * first byte of the packet from the target, e.g., 0x11 for RV traces or
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70 * 0x12 for L1 traces. Rvinterf will only start sending these messages
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71 * to a client after that client has expressed interest in receiving
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72 * target->host packets of a particular type.
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73 *
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74 * Messages beginning with RVI2CLI_LOCAL_CMD_RESP are generated locally
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75 * by rvinterf itself as responses to commands, currently as responses to
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76 * CLI2RVI_WANT_{RVTRACE,MUXPROTO}. The byte following the
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77 * RVT2CLI_LOCAL_CMD_RESP type code is ASCII '+' or ASCII '-', indicating
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78 * success or error, respectively. Any remaining bytes form a message
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79 * for the user.
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80 */