XANTRONIX Development
a4518a839a
Changes:
* Split patty_ax25_frame_decode() into the following:
- patty_ax25_frame_decode_address()
- patty_ax25_frame_decode_control()
This allows for look up an established socket for a given address
pair, to determine if an SABME session is in progress,
necessitating modulo-128 control decoding
* Decode I and S N(R), N(S) sequence numbers, poll/final
bits properly in both modulo-8 and modulo-128 mode
* Perform better frame control validation
* Implement the following functions in src/sock.c:
- patty_ax25_sock_send_rr()
- patty_ax25_sock_send_rnr()
- patty_ax25_sock_send_rej()
- patty_ax25_sock_send_srej()
Corresponding functions have been removed from src/server.c
* Implement better functions in src/sock.c for encoding frame
control, with send/receive sequences associated with the socket,
with modulo-128 encoding for SABME sessions
Other changes:
* Move or delete macros from include/patty/ax25/macros.h into
include/patty/ax25.h and include/patty/ax25/frame.h
* Move definitions from include/patty/ax25/proto.h to header file
include/patty/ax25.h
* Perform better bounds checking while decoding frames
* Improve frame control printing in src/print.c; display frame
type names, N(R), (NS) sequence numbers, and poll/final bits
117 lines
3.5 KiB
C
117 lines
3.5 KiB
C
#ifndef _PATTY_AX25_FRAME_H
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#define _PATTY_AX25_FRAME_H
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#include <stdint.h>
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#include <sys/types.h>
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#define PATTY_AX25_FRAME_DEFAULT_MAXLEN 256
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#define PATTY_AX25_FRAME_DEFAULT_WINDOW 8
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enum patty_ax25_frame_format {
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PATTY_AX25_FRAME_NORMAL,
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PATTY_AX25_FRAME_EXTENDED
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};
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enum patty_ax25_frame_cr {
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PATTY_AX25_FRAME_COMMAND,
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PATTY_AX25_FRAME_RESPONSE
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};
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enum patty_ax25_frame_flag {
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PATTY_AX25_FRAME_POLL = 1,
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PATTY_AX25_FRAME_FINAL = 1
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};
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#define PATTY_AX25_FRAME_CONTROL_I(c) \
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((c & 0x1) == 0x00)
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#define PATTY_AX25_FRAME_CONTROL_S(c) \
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((c & 0x03) == 0x01)
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#define PATTY_AX25_FRAME_CONTROL_U(c) \
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((c & 0x03) == 0x03)
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#define PATTY_AX25_FRAME_CONTROL_UI(c) \
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((c & 0xef) == 0x03)
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#define PATTY_AX25_FRAME_CONTROL_FLAG(c) \
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((c & 0x01) >> 4)
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#define PATTY_AX25_FRAME_SIZE(format, hops, c, infolen) \
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(((2 + hops) * sizeof(patty_ax25_addr)) \
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+ (format == PATTY_AX25_FRAME_EXTENDED? 2: 1) \
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+ (PATTY_AX25_FRAME_CONTROL_I(c)? 1 + infolen: 0))
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#define PATTY_AX25_FRAME_S_MASK 0x0f
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#define PATTY_AX25_FRAME_U_MASK 0xef
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enum patty_ax25_frame_type {
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PATTY_AX25_FRAME_I = 0x00,
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PATTY_AX25_FRAME_RR = 0x01,
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PATTY_AX25_FRAME_RNR = 0x05,
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PATTY_AX25_FRAME_REJ = 0x09,
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PATTY_AX25_FRAME_SREJ = 0x0d,
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PATTY_AX25_FRAME_SABM = 0x2f,
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PATTY_AX25_FRAME_SABME = 0x6f,
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PATTY_AX25_FRAME_DISC = 0x43,
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PATTY_AX25_FRAME_DM = 0x0f,
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PATTY_AX25_FRAME_UA = 0x63,
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PATTY_AX25_FRAME_FRMR = 0x87,
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PATTY_AX25_FRAME_UI = 0x03,
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PATTY_AX25_FRAME_XID = 0x8f,
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PATTY_AX25_FRAME_TEST = 0xe3,
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PATTY_AX25_FRAME_UNKNOWN = 0xff
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};
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typedef struct _patty_ax25_frame {
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patty_ax25_addr dest,
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src,
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repeaters[PATTY_AX25_MAX_HOPS];
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unsigned int hops;
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uint16_t control;
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uint8_t nr, ns, pf;
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enum patty_ax25_frame_type type;
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uint8_t proto;
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void *info;
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size_t infolen;
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} patty_ax25_frame;
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ssize_t patty_ax25_frame_decode_address(patty_ax25_frame *frame,
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void *buf,
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size_t len);
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ssize_t patty_ax25_frame_decode_control(patty_ax25_frame *frame,
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enum patty_ax25_frame_format format,
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void *buf,
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size_t offset,
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size_t len);
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ssize_t patty_ax25_frame_decode(patty_ax25_frame *frame,
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enum patty_ax25_frame_format format,
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void *buf,
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size_t len);
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ssize_t patty_ax25_frame_encode(patty_ax25_frame *frame,
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enum patty_ax25_frame_format format,
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void *buf,
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size_t len);
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ssize_t patty_ax25_frame_encode_reply_to(patty_ax25_frame *frame,
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patty_ax25_frame *reply,
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enum patty_ax25_frame_format format,
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void *buf,
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size_t len);
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enum patty_ax25_version patty_ax25_frame_version(patty_ax25_frame *frame);
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enum patty_ax25_frame_type patty_ax25_frame_type(patty_ax25_frame *frame);
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enum patty_ax25_frame_cr patty_ax25_frame_cr(patty_ax25_frame *frame);
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ssize_t patty_ax25_frame_info(patty_ax25_frame *frame,
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void **info);
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#endif /* _PATTY_AX25_FRAME_H */
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