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phoenix |
/*
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* Copyright 1996 The Board of Trustees of The Leland Stanford
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* Junior University. All Rights Reserved.
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*
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* Permission to use, copy, modify, and distribute this
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* software and its documentation for any purpose and without
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* fee is hereby granted, provided that the above copyright
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* notice appear in all copies. Stanford University
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* makes no representations about the suitability of this
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* software for any purpose. It is provided "as is" without
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* express or implied warranty.
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*
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* strip.c This module implements Starmode Radio IP (STRIP)
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* for kernel-based devices like TTY. It interfaces between a
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* raw TTY, and the kernel's INET protocol layers (via DDI).
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*
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* Version: @(#)strip.c 1.3 July 1997
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*
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* Author: Stuart Cheshire <cheshire@cs.stanford.edu>
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*
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* Fixes: v0.9 12th Feb 1996 (SC)
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* New byte stuffing (2+6 run-length encoding)
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* New watchdog timer task
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* New Protocol key (SIP0)
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*
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* v0.9.1 3rd March 1996 (SC)
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* Changed to dynamic device allocation -- no more compile
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* time (or boot time) limit on the number of STRIP devices.
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*
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* v0.9.2 13th March 1996 (SC)
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* Uses arp cache lookups (but doesn't send arp packets yet)
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*
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* v0.9.3 17th April 1996 (SC)
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* Fixed bug where STR_ERROR flag was getting set unneccessarily
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* (causing otherwise good packets to be unneccessarily dropped)
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*
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* v0.9.4 27th April 1996 (SC)
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* First attempt at using "&COMMAND" Starmode AT commands
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*
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* v0.9.5 29th May 1996 (SC)
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* First attempt at sending (unicast) ARP packets
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*
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* v0.9.6 5th June 1996 (Elliot)
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* Put "message level" tags in every "printk" statement
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*
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* v0.9.7 13th June 1996 (laik)
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* Added support for the /proc fs
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*
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* v0.9.8 July 1996 (Mema)
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* Added packet logging
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*
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* v1.0 November 1996 (SC)
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* Fixed (severe) memory leaks in the /proc fs code
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* Fixed race conditions in the logging code
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*
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* v1.1 January 1997 (SC)
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* Deleted packet logging (use tcpdump instead)
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* Added support for Metricom Firmware v204 features
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* (like message checksums)
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*
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* v1.2 January 1997 (SC)
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* Put portables list back in
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*
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* v1.3 July 1997 (SC)
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* Made STRIP driver set the radio's baud rate automatically.
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* It is no longer necessarily to manually set the radio's
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* rate permanently to 115200 -- the driver handles setting
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* the rate automatically.
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*/
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#ifdef MODULE
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static const char StripVersion[] = "1.3-STUART.CHESHIRE-MODULAR";
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#else
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static const char StripVersion[] = "1.3-STUART.CHESHIRE";
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#endif
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#define TICKLE_TIMERS 0
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#define EXT_COUNTERS 1
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/************************************************************************/
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/* Header files */
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/version.h>
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#include <linux/init.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include <asm/segment.h>
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#include <asm/bitops.h>
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/*
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* isdigit() and isspace() use the ctype[] array, which is not available
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* to kernel modules. If compiling as a module, use a local definition
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* of isdigit() and isspace() until _ctype is added to ksyms.
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*/
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#ifdef MODULE
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# define isdigit(c) ('0' <= (c) && (c) <= '9')
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# define isspace(c) ((c) == ' ' || (c) == '\t')
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#else
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# include <linux/ctype.h>
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#endif
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <linux/in.h>
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#include <linux/tty.h>
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#include <linux/errno.h>
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#include <linux/netdevice.h>
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#include <linux/inetdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/skbuff.h>
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#include <linux/if_arp.h>
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#include <linux/if_strip.h>
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#include <linux/proc_fs.h>
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#include <linux/serial.h>
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#include <linux/serialP.h>
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#include <net/arp.h>
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#include <linux/ip.h>
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#include <linux/tcp.h>
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#include <linux/time.h>
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/************************************************************************/
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/* Useful structures and definitions */
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/*
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* A MetricomKey identifies the protocol being carried inside a Metricom
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* Starmode packet.
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*/
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typedef union
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{
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__u8 c[4];
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__u32 l;
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} MetricomKey;
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/*
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* An IP address can be viewed as four bytes in memory (which is what it is) or as
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* a single 32-bit long (which is convenient for assignment, equality testing etc.)
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*/
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typedef union
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{
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__u8 b[4];
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__u32 l;
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} IPaddr;
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/*
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* A MetricomAddressString is used to hold a printable representation of
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* a Metricom address.
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*/
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typedef struct
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{
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__u8 c[24];
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} MetricomAddressString;
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/* Encapsulation can expand packet of size x to 65/64x + 1
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* Sent packet looks like "<CR>*<address>*<key><encaps payload><CR>"
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* 1 1 1-18 1 4 ? 1
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* eg. <CR>*0000-1234*SIP0<encaps payload><CR>
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* We allow 31 bytes for the stars, the key, the address and the <CR>s
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*/
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#define STRIP_ENCAP_SIZE(X) (32 + (X)*65L/64L)
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/*
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* A STRIP_Header is never really sent over the radio, but making a dummy
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* header for internal use within the kernel that looks like an Ethernet
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* header makes certain other software happier. For example, tcpdump
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* already understands Ethernet headers.
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*/
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typedef struct
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{
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MetricomAddress dst_addr; /* Destination address, e.g. "0000-1234" */
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MetricomAddress src_addr; /* Source address, e.g. "0000-5678" */
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unsigned short protocol; /* The protocol type, using Ethernet codes */
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} STRIP_Header;
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typedef struct
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{
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char c[60];
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} MetricomNode;
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#define NODE_TABLE_SIZE 32
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typedef struct
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{
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struct timeval timestamp;
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int num_nodes;
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MetricomNode node[NODE_TABLE_SIZE];
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} MetricomNodeTable;
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enum { FALSE = 0, TRUE = 1 };
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/*
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* Holds the radio's firmware version.
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*/
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typedef struct
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{
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char c[50];
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} FirmwareVersion;
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/*
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* Holds the radio's serial number.
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*/
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typedef struct
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{
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char c[18];
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} SerialNumber;
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/*
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* Holds the radio's battery voltage.
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*/
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typedef struct
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{
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char c[11];
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} BatteryVoltage;
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typedef struct
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{
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char c[8];
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} char8;
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enum
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{
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NoStructure = 0, /* Really old firmware */
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StructuredMessages = 1, /* Parsable AT response msgs */
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ChecksummedMessages = 2 /* Parsable AT response msgs with checksums */
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} FirmwareLevel;
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struct strip
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{
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int magic;
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/*
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* These are pointers to the malloc()ed frame buffers.
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*/
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unsigned char *rx_buff; /* buffer for received IP packet*/
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unsigned char *sx_buff; /* buffer for received serial data*/
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int sx_count; /* received serial data counter */
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int sx_size; /* Serial buffer size */
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unsigned char *tx_buff; /* transmitter buffer */
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unsigned char *tx_head; /* pointer to next byte to XMIT */
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int tx_left; /* bytes left in XMIT queue */
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int tx_size; /* Serial buffer size */
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/*
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* STRIP interface statistics.
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*/
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unsigned long rx_packets; /* inbound frames counter */
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unsigned long tx_packets; /* outbound frames counter */
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unsigned long rx_errors; /* Parity, etc. errors */
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unsigned long tx_errors; /* Planned stuff */
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unsigned long rx_dropped; /* No memory for skb */
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unsigned long tx_dropped; /* When MTU change */
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unsigned long rx_over_errors; /* Frame bigger then STRIP buf. */
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unsigned long pps_timer; /* Timer to determine pps */
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unsigned long rx_pps_count; /* Counter to determine pps */
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unsigned long tx_pps_count; /* Counter to determine pps */
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unsigned long sx_pps_count; /* Counter to determine pps */
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unsigned long rx_average_pps; /* rx packets per second * 8 */
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unsigned long tx_average_pps; /* tx packets per second * 8 */
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unsigned long sx_average_pps; /* sent packets per second * 8 */
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#ifdef EXT_COUNTERS
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unsigned long rx_bytes; /* total received bytes */
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unsigned long tx_bytes; /* total received bytes */
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unsigned long rx_rbytes; /* bytes thru radio i/f */
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unsigned long tx_rbytes; /* bytes thru radio i/f */
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unsigned long rx_sbytes; /* tot bytes thru serial i/f */
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unsigned long tx_sbytes; /* tot bytes thru serial i/f */
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unsigned long rx_ebytes; /* tot stat/err bytes */
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unsigned long tx_ebytes; /* tot stat/err bytes */
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#endif
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/*
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* Internal variables.
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*/
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struct strip *next; /* The next struct in the list */
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struct strip **referrer; /* The pointer that points to us*/
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int discard; /* Set if serial error */
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int working; /* Is radio working correctly? */
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int firmware_level; /* Message structuring level */
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int next_command; /* Next periodic command */
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unsigned int user_baud; /* The user-selected baud rate */
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int mtu; /* Our mtu (to spot changes!) */
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long watchdog_doprobe; /* Next time to test the radio */
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long watchdog_doreset; /* Time to do next reset */
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long gratuitous_arp; /* Time to send next ARP refresh*/
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long arp_interval; /* Next ARP interval */
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struct timer_list idle_timer; /* For periodic wakeup calls */
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MetricomAddress true_dev_addr; /* True address of radio */
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int manual_dev_addr; /* Hack: See note below */
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FirmwareVersion firmware_version; /* The radio's firmware version */
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SerialNumber serial_number; /* The radio's serial number */
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BatteryVoltage battery_voltage; /* The radio's battery voltage */
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/*
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* Other useful structures.
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*/
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struct tty_struct *tty; /* ptr to TTY structure */
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struct net_device dev; /* Our device structure */
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/*
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* Neighbour radio records
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*/
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MetricomNodeTable portables;
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MetricomNodeTable poletops;
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};
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/*
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* Note: manual_dev_addr hack
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*
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* It is not possible to change the hardware address of a Metricom radio,
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* or to send packets with a user-specified hardware source address, thus
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* trying to manually set a hardware source address is a questionable
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* thing to do. However, if the user *does* manually set the hardware
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* source address of a STRIP interface, then the kernel will believe it,
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* and use it in certain places. For example, the hardware address listed
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* by ifconfig will be the manual address, not the true one.
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* (Both addresses are listed in /proc/net/strip.)
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* Also, ARP packets will be sent out giving the user-specified address as
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* the source address, not the real address. This is dangerous, because
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* it means you won't receive any replies -- the ARP replies will go to
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* the specified address, which will be some other radio. The case where
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* this is useful is when that other radio is also connected to the same
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* machine. This allows you to connect a pair of radios to one machine,
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* and to use one exclusively for inbound traffic, and the other
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* exclusively for outbound traffic. Pretty neat, huh?
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*
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* Here's the full procedure to set this up:
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*
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* 1. "slattach" two interfaces, e.g. st0 for outgoing packets,
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* and st1 for incoming packets
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*
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* 2. "ifconfig" st0 (outbound radio) to have the hardware address
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* which is the real hardware address of st1 (inbound radio).
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* Now when it sends out packets, it will masquerade as st1, and
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* replies will be sent to that radio, which is exactly what we want.
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*
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* 3. Set the route table entry ("route add default ..." or
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* "route add -net ...", as appropriate) to send packets via the st0
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* interface (outbound radio). Do not add any route which sends packets
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* out via the st1 interface -- that radio is for inbound traffic only.
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*
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* 4. "ifconfig" st1 (inbound radio) to have hardware address zero.
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* This tells the STRIP driver to "shut down" that interface and not
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* send any packets through it. In particular, it stops sending the
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359 |
|
|
* periodic gratuitous ARP packets that a STRIP interface normally sends.
|
360 |
|
|
* Also, when packets arrive on that interface, it will search the
|
361 |
|
|
* interface list to see if there is another interface who's manual
|
362 |
|
|
* hardware address matches its own real address (i.e. st0 in this
|
363 |
|
|
* example) and if so it will transfer ownership of the skbuff to
|
364 |
|
|
* that interface, so that it looks to the kernel as if the packet
|
365 |
|
|
* arrived on that interface. This is necessary because when the
|
366 |
|
|
* kernel sends an ARP packet on st0, it expects to get a reply on
|
367 |
|
|
* st0, and if it sees the reply come from st1 then it will ignore
|
368 |
|
|
* it (to be accurate, it puts the entry in the ARP table, but
|
369 |
|
|
* labelled in such a way that st0 can't use it).
|
370 |
|
|
*
|
371 |
|
|
* Thanks to Petros Maniatis for coming up with the idea of splitting
|
372 |
|
|
* inbound and outbound traffic between two interfaces, which turned
|
373 |
|
|
* out to be really easy to implement, even if it is a bit of a hack.
|
374 |
|
|
*
|
375 |
|
|
* Having set a manual address on an interface, you can restore it
|
376 |
|
|
* to automatic operation (where the address is automatically kept
|
377 |
|
|
* consistent with the real address of the radio) by setting a manual
|
378 |
|
|
* address of all ones, e.g. "ifconfig st0 hw strip FFFFFFFFFFFF"
|
379 |
|
|
* This 'turns off' manual override mode for the device address.
|
380 |
|
|
*
|
381 |
|
|
* Note: The IEEE 802 headers reported in tcpdump will show the *real*
|
382 |
|
|
* radio addresses the packets were sent and received from, so that you
|
383 |
|
|
* can see what is really going on with packets, and which interfaces
|
384 |
|
|
* they are really going through.
|
385 |
|
|
*/
|
386 |
|
|
|
387 |
|
|
|
388 |
|
|
/************************************************************************/
|
389 |
|
|
/* Constants */
|
390 |
|
|
|
391 |
|
|
/*
|
392 |
|
|
* CommandString1 works on all radios
|
393 |
|
|
* Other CommandStrings are only used with firmware that provides structured responses.
|
394 |
|
|
*
|
395 |
|
|
* ats319=1 Enables Info message for node additions and deletions
|
396 |
|
|
* ats319=2 Enables Info message for a new best node
|
397 |
|
|
* ats319=4 Enables checksums
|
398 |
|
|
* ats319=8 Enables ACK messages
|
399 |
|
|
*/
|
400 |
|
|
|
401 |
|
|
static const int MaxCommandStringLength = 32;
|
402 |
|
|
static const int CompatibilityCommand = 1;
|
403 |
|
|
|
404 |
|
|
static const char CommandString0[] = "*&COMMAND*ATS319=7"; /* Turn on checksums & info messages */
|
405 |
|
|
static const char CommandString1[] = "*&COMMAND*ATS305?"; /* Query radio name */
|
406 |
|
|
static const char CommandString2[] = "*&COMMAND*ATS325?"; /* Query battery voltage */
|
407 |
|
|
static const char CommandString3[] = "*&COMMAND*ATS300?"; /* Query version information */
|
408 |
|
|
static const char CommandString4[] = "*&COMMAND*ATS311?"; /* Query poletop list */
|
409 |
|
|
static const char CommandString5[] = "*&COMMAND*AT~LA"; /* Query portables list */
|
410 |
|
|
typedef struct { const char *string; long length; } StringDescriptor;
|
411 |
|
|
|
412 |
|
|
static const StringDescriptor CommandString[] =
|
413 |
|
|
{
|
414 |
|
|
{ CommandString0, sizeof(CommandString0)-1 },
|
415 |
|
|
{ CommandString1, sizeof(CommandString1)-1 },
|
416 |
|
|
{ CommandString2, sizeof(CommandString2)-1 },
|
417 |
|
|
{ CommandString3, sizeof(CommandString3)-1 },
|
418 |
|
|
{ CommandString4, sizeof(CommandString4)-1 },
|
419 |
|
|
{ CommandString5, sizeof(CommandString5)-1 }
|
420 |
|
|
};
|
421 |
|
|
|
422 |
|
|
#define GOT_ALL_RADIO_INFO(S) \
|
423 |
|
|
((S)->firmware_version.c[0] && \
|
424 |
|
|
(S)->battery_voltage.c[0] && \
|
425 |
|
|
memcmp(&(S)->true_dev_addr, zero_address.c, sizeof(zero_address)))
|
426 |
|
|
|
427 |
|
|
static const char hextable[16] = "0123456789ABCDEF";
|
428 |
|
|
|
429 |
|
|
static const MetricomAddress zero_address;
|
430 |
|
|
static const MetricomAddress broadcast_address = { { 0xFF,0xFF,0xFF,0xFF,0xFF,0xFF } };
|
431 |
|
|
|
432 |
|
|
static const MetricomKey SIP0Key = { { "SIP0" } };
|
433 |
|
|
static const MetricomKey ARP0Key = { { "ARP0" } };
|
434 |
|
|
static const MetricomKey ATR_Key = { { "ATR " } };
|
435 |
|
|
static const MetricomKey ACK_Key = { { "ACK_" } };
|
436 |
|
|
static const MetricomKey INF_Key = { { "INF_" } };
|
437 |
|
|
static const MetricomKey ERR_Key = { { "ERR_" } };
|
438 |
|
|
|
439 |
|
|
static const long MaxARPInterval = 60 * HZ; /* One minute */
|
440 |
|
|
|
441 |
|
|
/*
|
442 |
|
|
* Maximum Starmode packet length is 1183 bytes. Allowing 4 bytes for
|
443 |
|
|
* protocol key, 4 bytes for checksum, one byte for CR, and 65/64 expansion
|
444 |
|
|
* for STRIP encoding, that translates to a maximum payload MTU of 1155.
|
445 |
|
|
* Note: A standard NFS 1K data packet is a total of 0x480 (1152) bytes
|
446 |
|
|
* long, including IP header, UDP header, and NFS header. Setting the STRIP
|
447 |
|
|
* MTU to 1152 allows us to send default sized NFS packets without fragmentation.
|
448 |
|
|
*/
|
449 |
|
|
static const unsigned short MAX_SEND_MTU = 1152;
|
450 |
|
|
static const unsigned short MAX_RECV_MTU = 1500; /* Hoping for Ethernet sized packets in the future! */
|
451 |
|
|
static const unsigned short DEFAULT_STRIP_MTU = 1152;
|
452 |
|
|
static const int STRIP_MAGIC = 0x5303;
|
453 |
|
|
static const long LongTime = 0x7FFFFFFF;
|
454 |
|
|
|
455 |
|
|
|
456 |
|
|
/************************************************************************/
|
457 |
|
|
/* Global variables */
|
458 |
|
|
|
459 |
|
|
static struct strip *struct_strip_list;
|
460 |
|
|
|
461 |
|
|
|
462 |
|
|
/************************************************************************/
|
463 |
|
|
/* Macros */
|
464 |
|
|
|
465 |
|
|
/* Returns TRUE if text T begins with prefix P */
|
466 |
|
|
#define has_prefix(T,L,P) (((L) >= sizeof(P)-1) && !strncmp((T), (P), sizeof(P)-1))
|
467 |
|
|
|
468 |
|
|
/* Returns TRUE if text T of length L is equal to string S */
|
469 |
|
|
#define text_equal(T,L,S) (((L) == sizeof(S)-1) && !strncmp((T), (S), sizeof(S)-1))
|
470 |
|
|
|
471 |
|
|
#define READHEX(X) ((X)>='0' && (X)<='9' ? (X)-'0' : \
|
472 |
|
|
(X)>='a' && (X)<='f' ? (X)-'a'+10 : \
|
473 |
|
|
(X)>='A' && (X)<='F' ? (X)-'A'+10 : 0 )
|
474 |
|
|
|
475 |
|
|
#define READHEX16(X) ((__u16)(READHEX(X)))
|
476 |
|
|
|
477 |
|
|
#define READDEC(X) ((X)>='0' && (X)<='9' ? (X)-'0' : 0)
|
478 |
|
|
|
479 |
|
|
#define MIN(X, Y) ((X) < (Y) ? (X) : (Y))
|
480 |
|
|
#define MAX(X, Y) ((X) > (Y) ? (X) : (Y))
|
481 |
|
|
#define ELEMENTS_OF(X) (sizeof(X) / sizeof((X)[0]))
|
482 |
|
|
#define ARRAY_END(X) (&((X)[ELEMENTS_OF(X)]))
|
483 |
|
|
|
484 |
|
|
#define JIFFIE_TO_SEC(X) ((X) / HZ)
|
485 |
|
|
|
486 |
|
|
|
487 |
|
|
/************************************************************************/
|
488 |
|
|
/* Utility routines */
|
489 |
|
|
|
490 |
|
|
typedef unsigned long InterruptStatus;
|
491 |
|
|
|
492 |
|
|
static inline InterruptStatus DisableInterrupts(void)
|
493 |
|
|
{
|
494 |
|
|
InterruptStatus x;
|
495 |
|
|
save_flags(x);
|
496 |
|
|
cli();
|
497 |
|
|
return(x);
|
498 |
|
|
}
|
499 |
|
|
|
500 |
|
|
static inline void RestoreInterrupts(InterruptStatus x)
|
501 |
|
|
{
|
502 |
|
|
restore_flags(x);
|
503 |
|
|
}
|
504 |
|
|
|
505 |
|
|
static int arp_query(unsigned char *haddr, u32 paddr, struct net_device * dev)
|
506 |
|
|
{
|
507 |
|
|
struct neighbour *neighbor_entry;
|
508 |
|
|
|
509 |
|
|
neighbor_entry = neigh_lookup(&arp_tbl, &paddr, dev);
|
510 |
|
|
|
511 |
|
|
if (neighbor_entry != NULL)
|
512 |
|
|
{
|
513 |
|
|
neighbor_entry->used = jiffies;
|
514 |
|
|
if (neighbor_entry->nud_state & NUD_VALID)
|
515 |
|
|
{
|
516 |
|
|
memcpy(haddr, neighbor_entry->ha, dev->addr_len);
|
517 |
|
|
return 1;
|
518 |
|
|
}
|
519 |
|
|
}
|
520 |
|
|
return 0;
|
521 |
|
|
}
|
522 |
|
|
|
523 |
|
|
static void DumpData(char *msg, struct strip *strip_info, __u8 *ptr, __u8 *end)
|
524 |
|
|
{
|
525 |
|
|
static const int MAX_DumpData = 80;
|
526 |
|
|
__u8 pkt_text[MAX_DumpData], *p = pkt_text;
|
527 |
|
|
|
528 |
|
|
*p++ = '\"';
|
529 |
|
|
|
530 |
|
|
while (ptr<end && p < &pkt_text[MAX_DumpData-4])
|
531 |
|
|
{
|
532 |
|
|
if (*ptr == '\\')
|
533 |
|
|
{
|
534 |
|
|
*p++ = '\\';
|
535 |
|
|
*p++ = '\\';
|
536 |
|
|
}
|
537 |
|
|
else
|
538 |
|
|
{
|
539 |
|
|
if (*ptr >= 32 && *ptr <= 126)
|
540 |
|
|
{
|
541 |
|
|
*p++ = *ptr;
|
542 |
|
|
}
|
543 |
|
|
else
|
544 |
|
|
{
|
545 |
|
|
sprintf(p, "\\%02X", *ptr);
|
546 |
|
|
p+= 3;
|
547 |
|
|
}
|
548 |
|
|
}
|
549 |
|
|
ptr++;
|
550 |
|
|
}
|
551 |
|
|
|
552 |
|
|
if (ptr == end)
|
553 |
|
|
{
|
554 |
|
|
*p++ = '\"';
|
555 |
|
|
}
|
556 |
|
|
|
557 |
|
|
*p++ = 0;
|
558 |
|
|
|
559 |
|
|
printk(KERN_INFO "%s: %-13s%s\n", strip_info->dev.name, msg, pkt_text);
|
560 |
|
|
}
|
561 |
|
|
|
562 |
|
|
#if 0
|
563 |
|
|
static void HexDump(char *msg, struct strip *strip_info, __u8 *start, __u8 *end)
|
564 |
|
|
{
|
565 |
|
|
__u8 *ptr = start;
|
566 |
|
|
printk(KERN_INFO "%s: %s: %d bytes\n", strip_info->dev.name, msg, end-ptr);
|
567 |
|
|
|
568 |
|
|
while (ptr < end)
|
569 |
|
|
{
|
570 |
|
|
long offset = ptr - start;
|
571 |
|
|
__u8 text[80], *p = text;
|
572 |
|
|
while (ptr < end && p < &text[16*3])
|
573 |
|
|
{
|
574 |
|
|
*p++ = hextable[*ptr >> 4];
|
575 |
|
|
*p++ = hextable[*ptr++ & 0xF];
|
576 |
|
|
*p++ = ' ';
|
577 |
|
|
}
|
578 |
|
|
p[-1] = 0;
|
579 |
|
|
printk(KERN_INFO "%s: %4lX %s\n", strip_info->dev.name, offset, text);
|
580 |
|
|
}
|
581 |
|
|
}
|
582 |
|
|
#endif
|
583 |
|
|
|
584 |
|
|
|
585 |
|
|
/************************************************************************/
|
586 |
|
|
/* Byte stuffing/unstuffing routines */
|
587 |
|
|
|
588 |
|
|
/* Stuffing scheme:
|
589 |
|
|
* 00 Unused (reserved character)
|
590 |
|
|
* 01-3F Run of 2-64 different characters
|
591 |
|
|
* 40-7F Run of 1-64 different characters plus a single zero at the end
|
592 |
|
|
* 80-BF Run of 1-64 of the same character
|
593 |
|
|
* C0-FF Run of 1-64 zeroes (ASCII 0)
|
594 |
|
|
*/
|
595 |
|
|
|
596 |
|
|
typedef enum
|
597 |
|
|
{
|
598 |
|
|
Stuff_Diff = 0x00,
|
599 |
|
|
Stuff_DiffZero = 0x40,
|
600 |
|
|
Stuff_Same = 0x80,
|
601 |
|
|
Stuff_Zero = 0xC0,
|
602 |
|
|
Stuff_NoCode = 0xFF, /* Special code, meaning no code selected */
|
603 |
|
|
|
604 |
|
|
Stuff_CodeMask = 0xC0,
|
605 |
|
|
Stuff_CountMask = 0x3F,
|
606 |
|
|
Stuff_MaxCount = 0x3F,
|
607 |
|
|
Stuff_Magic = 0x0D /* The value we are eliminating */
|
608 |
|
|
} StuffingCode;
|
609 |
|
|
|
610 |
|
|
/* StuffData encodes the data starting at "src" for "length" bytes.
|
611 |
|
|
* It writes it to the buffer pointed to by "dst" (which must be at least
|
612 |
|
|
* as long as 1 + 65/64 of the input length). The output may be up to 1.6%
|
613 |
|
|
* larger than the input for pathological input, but will usually be smaller.
|
614 |
|
|
* StuffData returns the new value of the dst pointer as its result.
|
615 |
|
|
* "code_ptr_ptr" points to a "__u8 *" which is used to hold encoding state
|
616 |
|
|
* between calls, allowing an encoded packet to be incrementally built up
|
617 |
|
|
* from small parts. On the first call, the "__u8 *" pointed to should be
|
618 |
|
|
* initialized to NULL; between subsequent calls the calling routine should
|
619 |
|
|
* leave the value alone and simply pass it back unchanged so that the
|
620 |
|
|
* encoder can recover its current state.
|
621 |
|
|
*/
|
622 |
|
|
|
623 |
|
|
#define StuffData_FinishBlock(X) \
|
624 |
|
|
(*code_ptr = (X) ^ Stuff_Magic, code = Stuff_NoCode)
|
625 |
|
|
|
626 |
|
|
static __u8 *StuffData(__u8 *src, __u32 length, __u8 *dst, __u8 **code_ptr_ptr)
|
627 |
|
|
{
|
628 |
|
|
__u8 *end = src + length;
|
629 |
|
|
__u8 *code_ptr = *code_ptr_ptr;
|
630 |
|
|
__u8 code = Stuff_NoCode, count = 0;
|
631 |
|
|
|
632 |
|
|
if (!length)
|
633 |
|
|
return(dst);
|
634 |
|
|
|
635 |
|
|
if (code_ptr)
|
636 |
|
|
{
|
637 |
|
|
/*
|
638 |
|
|
* Recover state from last call, if applicable
|
639 |
|
|
*/
|
640 |
|
|
code = (*code_ptr ^ Stuff_Magic) & Stuff_CodeMask;
|
641 |
|
|
count = (*code_ptr ^ Stuff_Magic) & Stuff_CountMask;
|
642 |
|
|
}
|
643 |
|
|
|
644 |
|
|
while (src < end)
|
645 |
|
|
{
|
646 |
|
|
switch (code)
|
647 |
|
|
{
|
648 |
|
|
/* Stuff_NoCode: If no current code, select one */
|
649 |
|
|
case Stuff_NoCode:
|
650 |
|
|
/* Record where we're going to put this code */
|
651 |
|
|
code_ptr = dst++;
|
652 |
|
|
count = 0; /* Reset the count (zero means one instance) */
|
653 |
|
|
/* Tentatively start a new block */
|
654 |
|
|
if (*src == 0)
|
655 |
|
|
{
|
656 |
|
|
code = Stuff_Zero;
|
657 |
|
|
src++;
|
658 |
|
|
}
|
659 |
|
|
else
|
660 |
|
|
{
|
661 |
|
|
code = Stuff_Same;
|
662 |
|
|
*dst++ = *src++ ^ Stuff_Magic;
|
663 |
|
|
}
|
664 |
|
|
/* Note: We optimistically assume run of same -- */
|
665 |
|
|
/* which will be fixed later in Stuff_Same */
|
666 |
|
|
/* if it turns out not to be true. */
|
667 |
|
|
break;
|
668 |
|
|
|
669 |
|
|
/* Stuff_Zero: We already have at least one zero encoded */
|
670 |
|
|
case Stuff_Zero:
|
671 |
|
|
/* If another zero, count it, else finish this code block */
|
672 |
|
|
if (*src == 0)
|
673 |
|
|
{
|
674 |
|
|
count++;
|
675 |
|
|
src++;
|
676 |
|
|
}
|
677 |
|
|
else
|
678 |
|
|
{
|
679 |
|
|
StuffData_FinishBlock(Stuff_Zero + count);
|
680 |
|
|
}
|
681 |
|
|
break;
|
682 |
|
|
|
683 |
|
|
/* Stuff_Same: We already have at least one byte encoded */
|
684 |
|
|
case Stuff_Same:
|
685 |
|
|
/* If another one the same, count it */
|
686 |
|
|
if ((*src ^ Stuff_Magic) == code_ptr[1])
|
687 |
|
|
{
|
688 |
|
|
count++;
|
689 |
|
|
src++;
|
690 |
|
|
break;
|
691 |
|
|
}
|
692 |
|
|
/* else, this byte does not match this block. */
|
693 |
|
|
/* If we already have two or more bytes encoded, finish this code block */
|
694 |
|
|
if (count)
|
695 |
|
|
{
|
696 |
|
|
StuffData_FinishBlock(Stuff_Same + count);
|
697 |
|
|
break;
|
698 |
|
|
}
|
699 |
|
|
/* else, we only have one so far, so switch to Stuff_Diff code */
|
700 |
|
|
code = Stuff_Diff;
|
701 |
|
|
/* and fall through to Stuff_Diff case below
|
702 |
|
|
* Note cunning cleverness here: case Stuff_Diff compares
|
703 |
|
|
* the current character with the previous two to see if it
|
704 |
|
|
* has a run of three the same. Won't this be an error if
|
705 |
|
|
* there aren't two previous characters stored to compare with?
|
706 |
|
|
* No. Because we know the current character is *not* the same
|
707 |
|
|
* as the previous one, the first test below will necessarily
|
708 |
|
|
* fail and the send half of the "if" won't be executed.
|
709 |
|
|
*/
|
710 |
|
|
|
711 |
|
|
/* Stuff_Diff: We have at least two *different* bytes encoded */
|
712 |
|
|
case Stuff_Diff:
|
713 |
|
|
/* If this is a zero, must encode a Stuff_DiffZero, and begin a new block */
|
714 |
|
|
if (*src == 0)
|
715 |
|
|
{
|
716 |
|
|
StuffData_FinishBlock(Stuff_DiffZero + count);
|
717 |
|
|
}
|
718 |
|
|
/* else, if we have three in a row, it is worth starting a Stuff_Same block */
|
719 |
|
|
else if ((*src ^ Stuff_Magic)==dst[-1] && dst[-1]==dst[-2])
|
720 |
|
|
{
|
721 |
|
|
/* Back off the last two characters we encoded */
|
722 |
|
|
code += count-2;
|
723 |
|
|
/* Note: "Stuff_Diff + 0" is an illegal code */
|
724 |
|
|
if (code == Stuff_Diff + 0)
|
725 |
|
|
{
|
726 |
|
|
code = Stuff_Same + 0;
|
727 |
|
|
}
|
728 |
|
|
StuffData_FinishBlock(code);
|
729 |
|
|
code_ptr = dst-2;
|
730 |
|
|
/* dst[-1] already holds the correct value */
|
731 |
|
|
count = 2; /* 2 means three bytes encoded */
|
732 |
|
|
code = Stuff_Same;
|
733 |
|
|
}
|
734 |
|
|
/* else, another different byte, so add it to the block */
|
735 |
|
|
else
|
736 |
|
|
{
|
737 |
|
|
*dst++ = *src ^ Stuff_Magic;
|
738 |
|
|
count++;
|
739 |
|
|
}
|
740 |
|
|
src++; /* Consume the byte */
|
741 |
|
|
break;
|
742 |
|
|
}
|
743 |
|
|
if (count == Stuff_MaxCount)
|
744 |
|
|
{
|
745 |
|
|
StuffData_FinishBlock(code + count);
|
746 |
|
|
}
|
747 |
|
|
}
|
748 |
|
|
if (code == Stuff_NoCode)
|
749 |
|
|
{
|
750 |
|
|
*code_ptr_ptr = NULL;
|
751 |
|
|
}
|
752 |
|
|
else
|
753 |
|
|
{
|
754 |
|
|
*code_ptr_ptr = code_ptr;
|
755 |
|
|
StuffData_FinishBlock(code + count);
|
756 |
|
|
}
|
757 |
|
|
return(dst);
|
758 |
|
|
}
|
759 |
|
|
|
760 |
|
|
/*
|
761 |
|
|
* UnStuffData decodes the data at "src", up to (but not including) "end".
|
762 |
|
|
* It writes the decoded data into the buffer pointed to by "dst", up to a
|
763 |
|
|
* maximum of "dst_length", and returns the new value of "src" so that a
|
764 |
|
|
* follow-on call can read more data, continuing from where the first left off.
|
765 |
|
|
*
|
766 |
|
|
* There are three types of results:
|
767 |
|
|
* 1. The source data runs out before extracting "dst_length" bytes:
|
768 |
|
|
* UnStuffData returns NULL to indicate failure.
|
769 |
|
|
* 2. The source data produces exactly "dst_length" bytes:
|
770 |
|
|
* UnStuffData returns new_src = end to indicate that all bytes were consumed.
|
771 |
|
|
* 3. "dst_length" bytes are extracted, with more remaining.
|
772 |
|
|
* UnStuffData returns new_src < end to indicate that there are more bytes
|
773 |
|
|
* to be read.
|
774 |
|
|
*
|
775 |
|
|
* Note: The decoding may be destructive, in that it may alter the source
|
776 |
|
|
* data in the process of decoding it (this is necessary to allow a follow-on
|
777 |
|
|
* call to resume correctly).
|
778 |
|
|
*/
|
779 |
|
|
|
780 |
|
|
static __u8 *UnStuffData(__u8 *src, __u8 *end, __u8 *dst, __u32 dst_length)
|
781 |
|
|
{
|
782 |
|
|
__u8 *dst_end = dst + dst_length;
|
783 |
|
|
/* Sanity check */
|
784 |
|
|
if (!src || !end || !dst || !dst_length)
|
785 |
|
|
return(NULL);
|
786 |
|
|
while (src < end && dst < dst_end)
|
787 |
|
|
{
|
788 |
|
|
int count = (*src ^ Stuff_Magic) & Stuff_CountMask;
|
789 |
|
|
switch ((*src ^ Stuff_Magic) & Stuff_CodeMask)
|
790 |
|
|
{
|
791 |
|
|
case Stuff_Diff:
|
792 |
|
|
if (src+1+count >= end)
|
793 |
|
|
return(NULL);
|
794 |
|
|
do
|
795 |
|
|
{
|
796 |
|
|
*dst++ = *++src ^ Stuff_Magic;
|
797 |
|
|
}
|
798 |
|
|
while(--count >= 0 && dst < dst_end);
|
799 |
|
|
if (count < 0)
|
800 |
|
|
src += 1;
|
801 |
|
|
else
|
802 |
|
|
{
|
803 |
|
|
if (count == 0)
|
804 |
|
|
*src = Stuff_Same ^ Stuff_Magic;
|
805 |
|
|
else
|
806 |
|
|
*src = (Stuff_Diff + count) ^ Stuff_Magic;
|
807 |
|
|
}
|
808 |
|
|
break;
|
809 |
|
|
case Stuff_DiffZero:
|
810 |
|
|
if (src+1+count >= end)
|
811 |
|
|
return(NULL);
|
812 |
|
|
do
|
813 |
|
|
{
|
814 |
|
|
*dst++ = *++src ^ Stuff_Magic;
|
815 |
|
|
}
|
816 |
|
|
while(--count >= 0 && dst < dst_end);
|
817 |
|
|
if (count < 0)
|
818 |
|
|
*src = Stuff_Zero ^ Stuff_Magic;
|
819 |
|
|
else
|
820 |
|
|
*src = (Stuff_DiffZero + count) ^ Stuff_Magic;
|
821 |
|
|
break;
|
822 |
|
|
case Stuff_Same:
|
823 |
|
|
if (src+1 >= end)
|
824 |
|
|
return(NULL);
|
825 |
|
|
do
|
826 |
|
|
{
|
827 |
|
|
*dst++ = src[1] ^ Stuff_Magic;
|
828 |
|
|
}
|
829 |
|
|
while(--count >= 0 && dst < dst_end);
|
830 |
|
|
if (count < 0)
|
831 |
|
|
src += 2;
|
832 |
|
|
else
|
833 |
|
|
*src = (Stuff_Same + count) ^ Stuff_Magic;
|
834 |
|
|
break;
|
835 |
|
|
case Stuff_Zero:
|
836 |
|
|
do
|
837 |
|
|
{
|
838 |
|
|
*dst++ = 0;
|
839 |
|
|
}
|
840 |
|
|
while(--count >= 0 && dst < dst_end);
|
841 |
|
|
if (count < 0)
|
842 |
|
|
src += 1;
|
843 |
|
|
else
|
844 |
|
|
*src = (Stuff_Zero + count) ^ Stuff_Magic;
|
845 |
|
|
break;
|
846 |
|
|
}
|
847 |
|
|
}
|
848 |
|
|
if (dst < dst_end)
|
849 |
|
|
return(NULL);
|
850 |
|
|
else
|
851 |
|
|
return(src);
|
852 |
|
|
}
|
853 |
|
|
|
854 |
|
|
|
855 |
|
|
/************************************************************************/
|
856 |
|
|
/* General routines for STRIP */
|
857 |
|
|
|
858 |
|
|
/*
|
859 |
|
|
* get_baud returns the current baud rate, as one of the constants defined in
|
860 |
|
|
* termbits.h
|
861 |
|
|
* If the user has issued a baud rate override using the 'setserial' command
|
862 |
|
|
* and the logical current rate is set to 38.4, then the true baud rate
|
863 |
|
|
* currently in effect (57.6 or 115.2) is returned.
|
864 |
|
|
*/
|
865 |
|
|
static unsigned int get_baud(struct tty_struct *tty)
|
866 |
|
|
{
|
867 |
|
|
if (!tty || !tty->termios) return(0);
|
868 |
|
|
if ((tty->termios->c_cflag & CBAUD) == B38400 && tty->driver_data)
|
869 |
|
|
{
|
870 |
|
|
struct async_struct *info = (struct async_struct *)tty->driver_data;
|
871 |
|
|
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI ) return(B57600);
|
872 |
|
|
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) return(B115200);
|
873 |
|
|
}
|
874 |
|
|
return(tty->termios->c_cflag & CBAUD);
|
875 |
|
|
}
|
876 |
|
|
|
877 |
|
|
/*
|
878 |
|
|
* set_baud sets the baud rate to the rate defined by baudcode
|
879 |
|
|
* Note: The rate B38400 should be avoided, because the user may have
|
880 |
|
|
* issued a 'setserial' speed override to map that to a different speed.
|
881 |
|
|
* We could achieve a true rate of 38400 if we needed to by cancelling
|
882 |
|
|
* any user speed override that is in place, but that might annoy the
|
883 |
|
|
* user, so it is simplest to just avoid using 38400.
|
884 |
|
|
*/
|
885 |
|
|
static void set_baud(struct tty_struct *tty, unsigned int baudcode)
|
886 |
|
|
{
|
887 |
|
|
struct termios old_termios = *(tty->termios);
|
888 |
|
|
tty->termios->c_cflag &= ~CBAUD; /* Clear the old baud setting */
|
889 |
|
|
tty->termios->c_cflag |= baudcode; /* Set the new baud setting */
|
890 |
|
|
tty->driver.set_termios(tty, &old_termios);
|
891 |
|
|
}
|
892 |
|
|
|
893 |
|
|
/*
|
894 |
|
|
* Convert a string to a Metricom Address.
|
895 |
|
|
*/
|
896 |
|
|
|
897 |
|
|
#define IS_RADIO_ADDRESS(p) ( \
|
898 |
|
|
isdigit((p)[0]) && isdigit((p)[1]) && isdigit((p)[2]) && isdigit((p)[3]) && \
|
899 |
|
|
(p)[4] == '-' && \
|
900 |
|
|
isdigit((p)[5]) && isdigit((p)[6]) && isdigit((p)[7]) && isdigit((p)[8]) )
|
901 |
|
|
|
902 |
|
|
static int string_to_radio_address(MetricomAddress *addr, __u8 *p)
|
903 |
|
|
{
|
904 |
|
|
if (!IS_RADIO_ADDRESS(p)) return(1);
|
905 |
|
|
addr->c[0] = 0;
|
906 |
|
|
addr->c[1] = 0;
|
907 |
|
|
addr->c[2] = READHEX(p[0]) << 4 | READHEX(p[1]);
|
908 |
|
|
addr->c[3] = READHEX(p[2]) << 4 | READHEX(p[3]);
|
909 |
|
|
addr->c[4] = READHEX(p[5]) << 4 | READHEX(p[6]);
|
910 |
|
|
addr->c[5] = READHEX(p[7]) << 4 | READHEX(p[8]);
|
911 |
|
|
return(0);
|
912 |
|
|
}
|
913 |
|
|
|
914 |
|
|
/*
|
915 |
|
|
* Convert a Metricom Address to a string.
|
916 |
|
|
*/
|
917 |
|
|
|
918 |
|
|
static __u8 *radio_address_to_string(const MetricomAddress *addr, MetricomAddressString *p)
|
919 |
|
|
{
|
920 |
|
|
sprintf(p->c, "%02X%02X-%02X%02X", addr->c[2], addr->c[3], addr->c[4], addr->c[5]);
|
921 |
|
|
return(p->c);
|
922 |
|
|
}
|
923 |
|
|
|
924 |
|
|
/*
|
925 |
|
|
* Note: Must make sure sx_size is big enough to receive a stuffed
|
926 |
|
|
* MAX_RECV_MTU packet. Additionally, we also want to ensure that it's
|
927 |
|
|
* big enough to receive a large radio neighbour list (currently 4K).
|
928 |
|
|
*/
|
929 |
|
|
|
930 |
|
|
static int allocate_buffers(struct strip *strip_info)
|
931 |
|
|
{
|
932 |
|
|
struct net_device *dev = &strip_info->dev;
|
933 |
|
|
int sx_size = MAX(STRIP_ENCAP_SIZE(MAX_RECV_MTU), 4096);
|
934 |
|
|
int tx_size = STRIP_ENCAP_SIZE(dev->mtu) + MaxCommandStringLength;
|
935 |
|
|
__u8 *r = kmalloc(MAX_RECV_MTU, GFP_ATOMIC);
|
936 |
|
|
__u8 *s = kmalloc(sx_size, GFP_ATOMIC);
|
937 |
|
|
__u8 *t = kmalloc(tx_size, GFP_ATOMIC);
|
938 |
|
|
if (r && s && t)
|
939 |
|
|
{
|
940 |
|
|
strip_info->rx_buff = r;
|
941 |
|
|
strip_info->sx_buff = s;
|
942 |
|
|
strip_info->tx_buff = t;
|
943 |
|
|
strip_info->sx_size = sx_size;
|
944 |
|
|
strip_info->tx_size = tx_size;
|
945 |
|
|
strip_info->mtu = dev->mtu;
|
946 |
|
|
return(1);
|
947 |
|
|
}
|
948 |
|
|
if (r) kfree(r);
|
949 |
|
|
if (s) kfree(s);
|
950 |
|
|
if (t) kfree(t);
|
951 |
|
|
return(0);
|
952 |
|
|
}
|
953 |
|
|
|
954 |
|
|
/*
|
955 |
|
|
* MTU has been changed by the IP layer. Unfortunately we are not told
|
956 |
|
|
* about this, but we spot it ourselves and fix things up. We could be in
|
957 |
|
|
* an upcall from the tty driver, or in an ip packet queue.
|
958 |
|
|
*/
|
959 |
|
|
|
960 |
|
|
static void strip_changedmtu(struct strip *strip_info)
|
961 |
|
|
{
|
962 |
|
|
int old_mtu = strip_info->mtu;
|
963 |
|
|
struct net_device *dev = &strip_info->dev;
|
964 |
|
|
unsigned char *orbuff = strip_info->rx_buff;
|
965 |
|
|
unsigned char *osbuff = strip_info->sx_buff;
|
966 |
|
|
unsigned char *otbuff = strip_info->tx_buff;
|
967 |
|
|
InterruptStatus intstat;
|
968 |
|
|
|
969 |
|
|
if (dev->mtu > MAX_SEND_MTU)
|
970 |
|
|
{
|
971 |
|
|
printk(KERN_ERR "%s: MTU exceeds maximum allowable (%d), MTU change cancelled.\n",
|
972 |
|
|
strip_info->dev.name, MAX_SEND_MTU);
|
973 |
|
|
dev->mtu = old_mtu;
|
974 |
|
|
return;
|
975 |
|
|
}
|
976 |
|
|
|
977 |
|
|
/*
|
978 |
|
|
* Have to disable interrupts here because we're reallocating and resizing
|
979 |
|
|
* the serial buffers, and we can't have data arriving in them while we're
|
980 |
|
|
* moving them around in memory. This may cause data to be lost on the serial
|
981 |
|
|
* port, but hopefully people won't change MTU that often.
|
982 |
|
|
* Also note, this may not work on a symmetric multi-processor system.
|
983 |
|
|
*/
|
984 |
|
|
intstat = DisableInterrupts();
|
985 |
|
|
|
986 |
|
|
if (!allocate_buffers(strip_info))
|
987 |
|
|
{
|
988 |
|
|
RestoreInterrupts(intstat);
|
989 |
|
|
printk(KERN_ERR "%s: unable to grow strip buffers, MTU change cancelled.\n",
|
990 |
|
|
strip_info->dev.name);
|
991 |
|
|
dev->mtu = old_mtu;
|
992 |
|
|
return;
|
993 |
|
|
}
|
994 |
|
|
|
995 |
|
|
if (strip_info->sx_count)
|
996 |
|
|
{
|
997 |
|
|
if (strip_info->sx_count <= strip_info->sx_size)
|
998 |
|
|
memcpy(strip_info->sx_buff, osbuff, strip_info->sx_count);
|
999 |
|
|
else
|
1000 |
|
|
{
|
1001 |
|
|
strip_info->discard = strip_info->sx_count;
|
1002 |
|
|
strip_info->rx_over_errors++;
|
1003 |
|
|
}
|
1004 |
|
|
}
|
1005 |
|
|
|
1006 |
|
|
if (strip_info->tx_left)
|
1007 |
|
|
{
|
1008 |
|
|
if (strip_info->tx_left <= strip_info->tx_size)
|
1009 |
|
|
memcpy(strip_info->tx_buff, strip_info->tx_head, strip_info->tx_left);
|
1010 |
|
|
else
|
1011 |
|
|
{
|
1012 |
|
|
strip_info->tx_left = 0;
|
1013 |
|
|
strip_info->tx_dropped++;
|
1014 |
|
|
}
|
1015 |
|
|
}
|
1016 |
|
|
strip_info->tx_head = strip_info->tx_buff;
|
1017 |
|
|
|
1018 |
|
|
RestoreInterrupts(intstat);
|
1019 |
|
|
|
1020 |
|
|
printk(KERN_NOTICE "%s: strip MTU changed fom %d to %d.\n",
|
1021 |
|
|
strip_info->dev.name, old_mtu, strip_info->mtu);
|
1022 |
|
|
|
1023 |
|
|
if (orbuff) kfree(orbuff);
|
1024 |
|
|
if (osbuff) kfree(osbuff);
|
1025 |
|
|
if (otbuff) kfree(otbuff);
|
1026 |
|
|
}
|
1027 |
|
|
|
1028 |
|
|
static void strip_unlock(struct strip *strip_info)
|
1029 |
|
|
{
|
1030 |
|
|
/*
|
1031 |
|
|
* Set the timer to go off in one second.
|
1032 |
|
|
*/
|
1033 |
|
|
strip_info->idle_timer.expires = jiffies + 1*HZ;
|
1034 |
|
|
add_timer(&strip_info->idle_timer);
|
1035 |
|
|
netif_wake_queue(&strip_info->dev);
|
1036 |
|
|
}
|
1037 |
|
|
|
1038 |
|
|
|
1039 |
|
|
/************************************************************************/
|
1040 |
|
|
/* Callback routines for exporting information through /proc */
|
1041 |
|
|
|
1042 |
|
|
/*
|
1043 |
|
|
* This function updates the total amount of data printed so far. It then
|
1044 |
|
|
* determines if the amount of data printed into a buffer has reached the
|
1045 |
|
|
* offset requested. If it hasn't, then the buffer is shifted over so that
|
1046 |
|
|
* the next bit of data can be printed over the old bit. If the total
|
1047 |
|
|
* amount printed so far exceeds the total amount requested, then this
|
1048 |
|
|
* function returns 1, otherwise 0.
|
1049 |
|
|
*/
|
1050 |
|
|
static int
|
1051 |
|
|
shift_buffer(char *buffer, int requested_offset, int requested_len,
|
1052 |
|
|
int *total, int *slop, char **buf)
|
1053 |
|
|
{
|
1054 |
|
|
int printed;
|
1055 |
|
|
|
1056 |
|
|
/* printk(KERN_DEBUG "shift: buffer: %d o: %d l: %d t: %d buf: %d\n",
|
1057 |
|
|
(int) buffer, requested_offset, requested_len, *total,
|
1058 |
|
|
(int) *buf); */
|
1059 |
|
|
printed = *buf - buffer;
|
1060 |
|
|
if (*total + printed <= requested_offset) {
|
1061 |
|
|
*total += printed;
|
1062 |
|
|
*buf = buffer;
|
1063 |
|
|
}
|
1064 |
|
|
else {
|
1065 |
|
|
if (*total < requested_offset) {
|
1066 |
|
|
*slop = requested_offset - *total;
|
1067 |
|
|
}
|
1068 |
|
|
*total = requested_offset + printed - *slop;
|
1069 |
|
|
}
|
1070 |
|
|
if (*total > requested_offset + requested_len) {
|
1071 |
|
|
return 1;
|
1072 |
|
|
}
|
1073 |
|
|
else {
|
1074 |
|
|
return 0;
|
1075 |
|
|
}
|
1076 |
|
|
}
|
1077 |
|
|
|
1078 |
|
|
/*
|
1079 |
|
|
* This function calculates the actual start of the requested data
|
1080 |
|
|
* in the buffer. It also calculates actual length of data returned,
|
1081 |
|
|
* which could be less that the amount of data requested.
|
1082 |
|
|
*/
|
1083 |
|
|
static int
|
1084 |
|
|
calc_start_len(char *buffer, char **start, int requested_offset,
|
1085 |
|
|
int requested_len, int total, char *buf)
|
1086 |
|
|
{
|
1087 |
|
|
int return_len, buffer_len;
|
1088 |
|
|
|
1089 |
|
|
buffer_len = buf - buffer;
|
1090 |
|
|
if (buffer_len >= 4095) {
|
1091 |
|
|
printk(KERN_ERR "STRIP: exceeded /proc buffer size\n");
|
1092 |
|
|
}
|
1093 |
|
|
|
1094 |
|
|
/*
|
1095 |
|
|
* There may be bytes before and after the
|
1096 |
|
|
* chunk that was actually requested.
|
1097 |
|
|
*/
|
1098 |
|
|
return_len = total - requested_offset;
|
1099 |
|
|
if (return_len < 0) {
|
1100 |
|
|
return_len = 0;
|
1101 |
|
|
}
|
1102 |
|
|
*start = buf - return_len;
|
1103 |
|
|
if (return_len > requested_len) {
|
1104 |
|
|
return_len = requested_len;
|
1105 |
|
|
}
|
1106 |
|
|
/* printk(KERN_DEBUG "return_len: %d\n", return_len); */
|
1107 |
|
|
return return_len;
|
1108 |
|
|
}
|
1109 |
|
|
|
1110 |
|
|
/*
|
1111 |
|
|
* If the time is in the near future, time_delta prints the number of
|
1112 |
|
|
* seconds to go into the buffer and returns the address of the buffer.
|
1113 |
|
|
* If the time is not in the near future, it returns the address of the
|
1114 |
|
|
* string "Not scheduled" The buffer must be long enough to contain the
|
1115 |
|
|
* ascii representation of the number plus 9 charactes for the " seconds"
|
1116 |
|
|
* and the null character.
|
1117 |
|
|
*/
|
1118 |
|
|
static char *time_delta(char buffer[], long time)
|
1119 |
|
|
{
|
1120 |
|
|
time -= jiffies;
|
1121 |
|
|
if (time > LongTime / 2) return("Not scheduled");
|
1122 |
|
|
if(time < 0) time = 0; /* Don't print negative times */
|
1123 |
|
|
sprintf(buffer, "%ld seconds", time / HZ);
|
1124 |
|
|
return(buffer);
|
1125 |
|
|
}
|
1126 |
|
|
|
1127 |
|
|
static int sprintf_neighbours(char *buffer, MetricomNodeTable *table, char *title)
|
1128 |
|
|
{
|
1129 |
|
|
/* We wrap this in a do/while loop, so if the table changes */
|
1130 |
|
|
/* while we're reading it, we just go around and try again. */
|
1131 |
|
|
struct timeval t;
|
1132 |
|
|
char *ptr;
|
1133 |
|
|
do
|
1134 |
|
|
{
|
1135 |
|
|
int i;
|
1136 |
|
|
t = table->timestamp;
|
1137 |
|
|
ptr = buffer;
|
1138 |
|
|
if (table->num_nodes) ptr += sprintf(ptr, "\n %s\n", title);
|
1139 |
|
|
for (i=0; i<table->num_nodes; i++)
|
1140 |
|
|
{
|
1141 |
|
|
InterruptStatus intstat = DisableInterrupts();
|
1142 |
|
|
MetricomNode node = table->node[i];
|
1143 |
|
|
RestoreInterrupts(intstat);
|
1144 |
|
|
ptr += sprintf(ptr, " %s\n", node.c);
|
1145 |
|
|
}
|
1146 |
|
|
} while (table->timestamp.tv_sec != t.tv_sec || table->timestamp.tv_usec != t.tv_usec);
|
1147 |
|
|
return ptr - buffer;
|
1148 |
|
|
}
|
1149 |
|
|
|
1150 |
|
|
/*
|
1151 |
|
|
* This function prints radio status information into the specified buffer.
|
1152 |
|
|
* I think the buffer size is 4K, so this routine should never print more
|
1153 |
|
|
* than 4K of data into it. With the maximum of 32 portables and 32 poletops
|
1154 |
|
|
* reported, the routine outputs 3107 bytes into the buffer.
|
1155 |
|
|
*/
|
1156 |
|
|
static int
|
1157 |
|
|
sprintf_status_info(char *buffer, struct strip *strip_info)
|
1158 |
|
|
{
|
1159 |
|
|
char temp[32];
|
1160 |
|
|
char *p = buffer;
|
1161 |
|
|
MetricomAddressString addr_string;
|
1162 |
|
|
|
1163 |
|
|
/* First, we must copy all of our data to a safe place, */
|
1164 |
|
|
/* in case a serial interrupt comes in and changes it. */
|
1165 |
|
|
InterruptStatus intstat = DisableInterrupts();
|
1166 |
|
|
int tx_left = strip_info->tx_left;
|
1167 |
|
|
unsigned long rx_average_pps = strip_info->rx_average_pps;
|
1168 |
|
|
unsigned long tx_average_pps = strip_info->tx_average_pps;
|
1169 |
|
|
unsigned long sx_average_pps = strip_info->sx_average_pps;
|
1170 |
|
|
int working = strip_info->working;
|
1171 |
|
|
int firmware_level = strip_info->firmware_level;
|
1172 |
|
|
long watchdog_doprobe = strip_info->watchdog_doprobe;
|
1173 |
|
|
long watchdog_doreset = strip_info->watchdog_doreset;
|
1174 |
|
|
long gratuitous_arp = strip_info->gratuitous_arp;
|
1175 |
|
|
long arp_interval = strip_info->arp_interval;
|
1176 |
|
|
FirmwareVersion firmware_version = strip_info->firmware_version;
|
1177 |
|
|
SerialNumber serial_number = strip_info->serial_number;
|
1178 |
|
|
BatteryVoltage battery_voltage = strip_info->battery_voltage;
|
1179 |
|
|
char* if_name = strip_info->dev.name;
|
1180 |
|
|
MetricomAddress true_dev_addr = strip_info->true_dev_addr;
|
1181 |
|
|
MetricomAddress dev_dev_addr = *(MetricomAddress*)strip_info->dev.dev_addr;
|
1182 |
|
|
int manual_dev_addr = strip_info->manual_dev_addr;
|
1183 |
|
|
#ifdef EXT_COUNTERS
|
1184 |
|
|
unsigned long rx_bytes = strip_info->rx_bytes;
|
1185 |
|
|
unsigned long tx_bytes = strip_info->tx_bytes;
|
1186 |
|
|
unsigned long rx_rbytes = strip_info->rx_rbytes;
|
1187 |
|
|
unsigned long tx_rbytes = strip_info->tx_rbytes;
|
1188 |
|
|
unsigned long rx_sbytes = strip_info->rx_sbytes;
|
1189 |
|
|
unsigned long tx_sbytes = strip_info->tx_sbytes;
|
1190 |
|
|
unsigned long rx_ebytes = strip_info->rx_ebytes;
|
1191 |
|
|
unsigned long tx_ebytes = strip_info->tx_ebytes;
|
1192 |
|
|
#endif
|
1193 |
|
|
RestoreInterrupts(intstat);
|
1194 |
|
|
|
1195 |
|
|
p += sprintf(p, "\nInterface name\t\t%s\n", if_name);
|
1196 |
|
|
p += sprintf(p, " Radio working:\t\t%s\n", working ? "Yes" : "No");
|
1197 |
|
|
radio_address_to_string(&true_dev_addr, &addr_string);
|
1198 |
|
|
p += sprintf(p, " Radio address:\t\t%s\n", addr_string.c);
|
1199 |
|
|
if (manual_dev_addr)
|
1200 |
|
|
{
|
1201 |
|
|
radio_address_to_string(&dev_dev_addr, &addr_string);
|
1202 |
|
|
p += sprintf(p, " Device address:\t%s\n", addr_string.c);
|
1203 |
|
|
}
|
1204 |
|
|
p += sprintf(p, " Firmware version:\t%s", !working ? "Unknown" :
|
1205 |
|
|
!firmware_level ? "Should be upgraded" :
|
1206 |
|
|
firmware_version.c);
|
1207 |
|
|
if (firmware_level >= ChecksummedMessages) p += sprintf(p, " (Checksums Enabled)");
|
1208 |
|
|
p += sprintf(p, "\n");
|
1209 |
|
|
p += sprintf(p, " Serial number:\t\t%s\n", serial_number.c);
|
1210 |
|
|
p += sprintf(p, " Battery voltage:\t%s\n", battery_voltage.c);
|
1211 |
|
|
p += sprintf(p, " Transmit queue (bytes):%d\n", tx_left);
|
1212 |
|
|
p += sprintf(p, " Receive packet rate: %ld packets per second\n", rx_average_pps / 8);
|
1213 |
|
|
p += sprintf(p, " Transmit packet rate: %ld packets per second\n", tx_average_pps / 8);
|
1214 |
|
|
p += sprintf(p, " Sent packet rate: %ld packets per second\n", sx_average_pps / 8);
|
1215 |
|
|
p += sprintf(p, " Next watchdog probe:\t%s\n", time_delta(temp, watchdog_doprobe));
|
1216 |
|
|
p += sprintf(p, " Next watchdog reset:\t%s\n", time_delta(temp, watchdog_doreset));
|
1217 |
|
|
p += sprintf(p, " Next gratuitous ARP:\t");
|
1218 |
|
|
|
1219 |
|
|
if (!memcmp(strip_info->dev.dev_addr, zero_address.c, sizeof(zero_address)))
|
1220 |
|
|
p += sprintf(p, "Disabled\n");
|
1221 |
|
|
else
|
1222 |
|
|
{
|
1223 |
|
|
p += sprintf(p, "%s\n", time_delta(temp, gratuitous_arp));
|
1224 |
|
|
p += sprintf(p, " Next ARP interval:\t%ld seconds\n", JIFFIE_TO_SEC(arp_interval));
|
1225 |
|
|
}
|
1226 |
|
|
|
1227 |
|
|
if (working)
|
1228 |
|
|
{
|
1229 |
|
|
#ifdef EXT_COUNTERS
|
1230 |
|
|
p += sprintf(p, "\n");
|
1231 |
|
|
p += sprintf(p, " Total bytes: \trx:\t%lu\ttx:\t%lu\n", rx_bytes, tx_bytes);
|
1232 |
|
|
p += sprintf(p, " thru radio: \trx:\t%lu\ttx:\t%lu\n", rx_rbytes, tx_rbytes);
|
1233 |
|
|
p += sprintf(p, " thru serial port: \trx:\t%lu\ttx:\t%lu\n", rx_sbytes, tx_sbytes);
|
1234 |
|
|
p += sprintf(p, " Total stat/err bytes:\trx:\t%lu\ttx:\t%lu\n", rx_ebytes, tx_ebytes);
|
1235 |
|
|
#endif
|
1236 |
|
|
p += sprintf_neighbours(p, &strip_info->poletops, "Poletops:");
|
1237 |
|
|
p += sprintf_neighbours(p, &strip_info->portables, "Portables:");
|
1238 |
|
|
}
|
1239 |
|
|
|
1240 |
|
|
return p - buffer;
|
1241 |
|
|
}
|
1242 |
|
|
|
1243 |
|
|
/*
|
1244 |
|
|
* This function is exports status information from the STRIP driver through
|
1245 |
|
|
* the /proc file system.
|
1246 |
|
|
*/
|
1247 |
|
|
|
1248 |
|
|
static int get_status_info(char *buffer, char **start, off_t req_offset, int req_len)
|
1249 |
|
|
{
|
1250 |
|
|
int total = 0, slop = 0;
|
1251 |
|
|
struct strip *strip_info = struct_strip_list;
|
1252 |
|
|
char *buf = buffer;
|
1253 |
|
|
|
1254 |
|
|
buf += sprintf(buf, "strip_version: %s\n", StripVersion);
|
1255 |
|
|
if (shift_buffer(buffer, req_offset, req_len, &total, &slop, &buf)) goto exit;
|
1256 |
|
|
|
1257 |
|
|
while (strip_info != NULL)
|
1258 |
|
|
{
|
1259 |
|
|
buf += sprintf_status_info(buf, strip_info);
|
1260 |
|
|
if (shift_buffer(buffer, req_offset, req_len, &total, &slop, &buf)) break;
|
1261 |
|
|
strip_info = strip_info->next;
|
1262 |
|
|
}
|
1263 |
|
|
exit:
|
1264 |
|
|
return(calc_start_len(buffer, start, req_offset, req_len, total, buf));
|
1265 |
|
|
}
|
1266 |
|
|
|
1267 |
|
|
/************************************************************************/
|
1268 |
|
|
/* Sending routines */
|
1269 |
|
|
|
1270 |
|
|
static void ResetRadio(struct strip *strip_info)
|
1271 |
|
|
{
|
1272 |
|
|
struct tty_struct *tty = strip_info->tty;
|
1273 |
|
|
static const char init[] = "ate0q1dt**starmode\r**";
|
1274 |
|
|
StringDescriptor s = { init, sizeof(init)-1 };
|
1275 |
|
|
|
1276 |
|
|
/*
|
1277 |
|
|
* If the radio isn't working anymore,
|
1278 |
|
|
* we should clear the old status information.
|
1279 |
|
|
*/
|
1280 |
|
|
if (strip_info->working)
|
1281 |
|
|
{
|
1282 |
|
|
printk(KERN_INFO "%s: No response: Resetting radio.\n", strip_info->dev.name);
|
1283 |
|
|
strip_info->firmware_version.c[0] = '\0';
|
1284 |
|
|
strip_info->serial_number.c[0] = '\0';
|
1285 |
|
|
strip_info->battery_voltage.c[0] = '\0';
|
1286 |
|
|
strip_info->portables.num_nodes = 0;
|
1287 |
|
|
do_gettimeofday(&strip_info->portables.timestamp);
|
1288 |
|
|
strip_info->poletops.num_nodes = 0;
|
1289 |
|
|
do_gettimeofday(&strip_info->poletops.timestamp);
|
1290 |
|
|
}
|
1291 |
|
|
|
1292 |
|
|
strip_info->pps_timer = jiffies;
|
1293 |
|
|
strip_info->rx_pps_count = 0;
|
1294 |
|
|
strip_info->tx_pps_count = 0;
|
1295 |
|
|
strip_info->sx_pps_count = 0;
|
1296 |
|
|
strip_info->rx_average_pps = 0;
|
1297 |
|
|
strip_info->tx_average_pps = 0;
|
1298 |
|
|
strip_info->sx_average_pps = 0;
|
1299 |
|
|
|
1300 |
|
|
/* Mark radio address as unknown */
|
1301 |
|
|
*(MetricomAddress*)&strip_info->true_dev_addr = zero_address;
|
1302 |
|
|
if (!strip_info->manual_dev_addr)
|
1303 |
|
|
*(MetricomAddress*)strip_info->dev.dev_addr = zero_address;
|
1304 |
|
|
strip_info->working = FALSE;
|
1305 |
|
|
strip_info->firmware_level = NoStructure;
|
1306 |
|
|
strip_info->next_command = CompatibilityCommand;
|
1307 |
|
|
strip_info->watchdog_doprobe = jiffies + 10 * HZ;
|
1308 |
|
|
strip_info->watchdog_doreset = jiffies + 1 * HZ;
|
1309 |
|
|
|
1310 |
|
|
/* If the user has selected a baud rate above 38.4 see what magic we have to do */
|
1311 |
|
|
if (strip_info->user_baud > B38400)
|
1312 |
|
|
{
|
1313 |
|
|
/*
|
1314 |
|
|
* Subtle stuff: Pay attention :-)
|
1315 |
|
|
* If the serial port is currently at the user's selected (>38.4) rate,
|
1316 |
|
|
* then we temporarily switch to 19.2 and issue the ATS304 command
|
1317 |
|
|
* to tell the radio to switch to the user's selected rate.
|
1318 |
|
|
* If the serial port is not currently at that rate, that means we just
|
1319 |
|
|
* issued the ATS304 command last time through, so this time we restore
|
1320 |
|
|
* the user's selected rate and issue the normal starmode reset string.
|
1321 |
|
|
*/
|
1322 |
|
|
if (strip_info->user_baud == get_baud(tty))
|
1323 |
|
|
{
|
1324 |
|
|
static const char b0[] = "ate0q1s304=57600\r";
|
1325 |
|
|
static const char b1[] = "ate0q1s304=115200\r";
|
1326 |
|
|
static const StringDescriptor baudstring[2] =
|
1327 |
|
|
{ { b0, sizeof(b0)-1 }, { b1, sizeof(b1)-1 } };
|
1328 |
|
|
set_baud(tty, B19200);
|
1329 |
|
|
if (strip_info->user_baud == B57600 ) s = baudstring[0];
|
1330 |
|
|
else if (strip_info->user_baud == B115200) s = baudstring[1];
|
1331 |
|
|
else s = baudstring[1]; /* For now */
|
1332 |
|
|
}
|
1333 |
|
|
else set_baud(tty, strip_info->user_baud);
|
1334 |
|
|
}
|
1335 |
|
|
|
1336 |
|
|
tty->driver.write(tty, 0, s.string, s.length);
|
1337 |
|
|
#ifdef EXT_COUNTERS
|
1338 |
|
|
strip_info->tx_ebytes += s.length;
|
1339 |
|
|
#endif
|
1340 |
|
|
}
|
1341 |
|
|
|
1342 |
|
|
/*
|
1343 |
|
|
* Called by the driver when there's room for more data. If we have
|
1344 |
|
|
* more packets to send, we send them here.
|
1345 |
|
|
*/
|
1346 |
|
|
|
1347 |
|
|
static void strip_write_some_more(struct tty_struct *tty)
|
1348 |
|
|
{
|
1349 |
|
|
struct strip *strip_info = (struct strip *) tty->disc_data;
|
1350 |
|
|
|
1351 |
|
|
/* First make sure we're connected. */
|
1352 |
|
|
if (!strip_info || strip_info->magic != STRIP_MAGIC ||
|
1353 |
|
|
!netif_running(&strip_info->dev))
|
1354 |
|
|
return;
|
1355 |
|
|
|
1356 |
|
|
if (strip_info->tx_left > 0)
|
1357 |
|
|
{
|
1358 |
|
|
/*
|
1359 |
|
|
* If some data left, send it
|
1360 |
|
|
* Note: There's a kernel design bug here. The write_wakeup routine has to
|
1361 |
|
|
* know how many bytes were written in the previous call, but the number of
|
1362 |
|
|
* bytes written is returned as the result of the tty->driver.write call,
|
1363 |
|
|
* and there's no guarantee that the tty->driver.write routine will have
|
1364 |
|
|
* returned before the write_wakeup routine is invoked. If the PC has fast
|
1365 |
|
|
* Serial DMA hardware, then it's quite possible that the write could complete
|
1366 |
|
|
* almost instantaneously, meaning that my write_wakeup routine could be
|
1367 |
|
|
* called immediately, before tty->driver.write has had a chance to return
|
1368 |
|
|
* the number of bytes that it wrote. In an attempt to guard against this,
|
1369 |
|
|
* I disable interrupts around the call to tty->driver.write, although even
|
1370 |
|
|
* this might not work on a symmetric multi-processor system.
|
1371 |
|
|
*/
|
1372 |
|
|
InterruptStatus intstat = DisableInterrupts();
|
1373 |
|
|
int num_written = tty->driver.write(tty, 0, strip_info->tx_head, strip_info->tx_left);
|
1374 |
|
|
strip_info->tx_left -= num_written;
|
1375 |
|
|
strip_info->tx_head += num_written;
|
1376 |
|
|
#ifdef EXT_COUNTERS
|
1377 |
|
|
strip_info->tx_sbytes += num_written;
|
1378 |
|
|
#endif
|
1379 |
|
|
RestoreInterrupts(intstat);
|
1380 |
|
|
}
|
1381 |
|
|
else /* Else start transmission of another packet */
|
1382 |
|
|
{
|
1383 |
|
|
tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP);
|
1384 |
|
|
strip_unlock(strip_info);
|
1385 |
|
|
}
|
1386 |
|
|
}
|
1387 |
|
|
|
1388 |
|
|
static __u8 *add_checksum(__u8 *buffer, __u8 *end)
|
1389 |
|
|
{
|
1390 |
|
|
__u16 sum = 0;
|
1391 |
|
|
__u8 *p = buffer;
|
1392 |
|
|
while (p < end) sum += *p++;
|
1393 |
|
|
end[3] = hextable[sum & 0xF]; sum >>= 4;
|
1394 |
|
|
end[2] = hextable[sum & 0xF]; sum >>= 4;
|
1395 |
|
|
end[1] = hextable[sum & 0xF]; sum >>= 4;
|
1396 |
|
|
end[0] = hextable[sum & 0xF];
|
1397 |
|
|
return(end+4);
|
1398 |
|
|
}
|
1399 |
|
|
|
1400 |
|
|
static unsigned char *strip_make_packet(unsigned char *buffer, struct strip *strip_info, struct sk_buff *skb)
|
1401 |
|
|
{
|
1402 |
|
|
__u8 *ptr = buffer;
|
1403 |
|
|
__u8 *stuffstate = NULL;
|
1404 |
|
|
STRIP_Header *header = (STRIP_Header *)skb->data;
|
1405 |
|
|
MetricomAddress haddr = header->dst_addr;
|
1406 |
|
|
int len = skb->len - sizeof(STRIP_Header);
|
1407 |
|
|
MetricomKey key;
|
1408 |
|
|
|
1409 |
|
|
/*HexDump("strip_make_packet", strip_info, skb->data, skb->data + skb->len);*/
|
1410 |
|
|
|
1411 |
|
|
if (header->protocol == htons(ETH_P_IP)) key = SIP0Key;
|
1412 |
|
|
else if (header->protocol == htons(ETH_P_ARP)) key = ARP0Key;
|
1413 |
|
|
else
|
1414 |
|
|
{
|
1415 |
|
|
printk(KERN_ERR "%s: strip_make_packet: Unknown packet type 0x%04X\n",
|
1416 |
|
|
strip_info->dev.name, ntohs(header->protocol));
|
1417 |
|
|
return(NULL);
|
1418 |
|
|
}
|
1419 |
|
|
|
1420 |
|
|
if (len > strip_info->mtu)
|
1421 |
|
|
{
|
1422 |
|
|
printk(KERN_ERR "%s: Dropping oversized transmit packet: %d bytes\n",
|
1423 |
|
|
strip_info->dev.name, len);
|
1424 |
|
|
return(NULL);
|
1425 |
|
|
}
|
1426 |
|
|
|
1427 |
|
|
/*
|
1428 |
|
|
* If we're sending to ourselves, discard the packet.
|
1429 |
|
|
* (Metricom radios choke if they try to send a packet to their own address.)
|
1430 |
|
|
*/
|
1431 |
|
|
if (!memcmp(haddr.c, strip_info->true_dev_addr.c, sizeof(haddr)))
|
1432 |
|
|
{
|
1433 |
|
|
printk(KERN_ERR "%s: Dropping packet addressed to self\n", strip_info->dev.name);
|
1434 |
|
|
return(NULL);
|
1435 |
|
|
}
|
1436 |
|
|
|
1437 |
|
|
/*
|
1438 |
|
|
* If this is a broadcast packet, send it to our designated Metricom
|
1439 |
|
|
* 'broadcast hub' radio (First byte of address being 0xFF means broadcast)
|
1440 |
|
|
*/
|
1441 |
|
|
if (haddr.c[0] == 0xFF)
|
1442 |
|
|
{
|
1443 |
|
|
u32 brd = 0;
|
1444 |
|
|
struct in_device *in_dev = in_dev_get(&strip_info->dev);
|
1445 |
|
|
if (in_dev == NULL)
|
1446 |
|
|
return NULL;
|
1447 |
|
|
read_lock(&in_dev->lock);
|
1448 |
|
|
if (in_dev->ifa_list)
|
1449 |
|
|
brd = in_dev->ifa_list->ifa_broadcast;
|
1450 |
|
|
read_unlock(&in_dev->lock);
|
1451 |
|
|
in_dev_put(in_dev);
|
1452 |
|
|
|
1453 |
|
|
/* arp_query returns 1 if it succeeds in looking up the address, 0 if it fails */
|
1454 |
|
|
if (!arp_query(haddr.c, brd, &strip_info->dev))
|
1455 |
|
|
{
|
1456 |
|
|
printk(KERN_ERR "%s: Unable to send packet (no broadcast hub configured)\n",
|
1457 |
|
|
strip_info->dev.name);
|
1458 |
|
|
return(NULL);
|
1459 |
|
|
}
|
1460 |
|
|
/*
|
1461 |
|
|
* If we are the broadcast hub, don't bother sending to ourselves.
|
1462 |
|
|
* (Metricom radios choke if they try to send a packet to their own address.)
|
1463 |
|
|
*/
|
1464 |
|
|
if (!memcmp(haddr.c, strip_info->true_dev_addr.c, sizeof(haddr))) return(NULL);
|
1465 |
|
|
}
|
1466 |
|
|
|
1467 |
|
|
*ptr++ = 0x0D;
|
1468 |
|
|
*ptr++ = '*';
|
1469 |
|
|
*ptr++ = hextable[haddr.c[2] >> 4];
|
1470 |
|
|
*ptr++ = hextable[haddr.c[2] & 0xF];
|
1471 |
|
|
*ptr++ = hextable[haddr.c[3] >> 4];
|
1472 |
|
|
*ptr++ = hextable[haddr.c[3] & 0xF];
|
1473 |
|
|
*ptr++ = '-';
|
1474 |
|
|
*ptr++ = hextable[haddr.c[4] >> 4];
|
1475 |
|
|
*ptr++ = hextable[haddr.c[4] & 0xF];
|
1476 |
|
|
*ptr++ = hextable[haddr.c[5] >> 4];
|
1477 |
|
|
*ptr++ = hextable[haddr.c[5] & 0xF];
|
1478 |
|
|
*ptr++ = '*';
|
1479 |
|
|
*ptr++ = key.c[0];
|
1480 |
|
|
*ptr++ = key.c[1];
|
1481 |
|
|
*ptr++ = key.c[2];
|
1482 |
|
|
*ptr++ = key.c[3];
|
1483 |
|
|
|
1484 |
|
|
ptr = StuffData(skb->data + sizeof(STRIP_Header), len, ptr, &stuffstate);
|
1485 |
|
|
|
1486 |
|
|
if (strip_info->firmware_level >= ChecksummedMessages) ptr = add_checksum(buffer+1, ptr);
|
1487 |
|
|
|
1488 |
|
|
*ptr++ = 0x0D;
|
1489 |
|
|
return(ptr);
|
1490 |
|
|
}
|
1491 |
|
|
|
1492 |
|
|
static void strip_send(struct strip *strip_info, struct sk_buff *skb)
|
1493 |
|
|
{
|
1494 |
|
|
MetricomAddress haddr;
|
1495 |
|
|
unsigned char *ptr = strip_info->tx_buff;
|
1496 |
|
|
int doreset = (long)jiffies - strip_info->watchdog_doreset >= 0;
|
1497 |
|
|
int doprobe = (long)jiffies - strip_info->watchdog_doprobe >= 0 && !doreset;
|
1498 |
|
|
u32 addr, brd;
|
1499 |
|
|
|
1500 |
|
|
/*
|
1501 |
|
|
* 1. If we have a packet, encapsulate it and put it in the buffer
|
1502 |
|
|
*/
|
1503 |
|
|
if (skb)
|
1504 |
|
|
{
|
1505 |
|
|
char *newptr = strip_make_packet(ptr, strip_info, skb);
|
1506 |
|
|
strip_info->tx_pps_count++;
|
1507 |
|
|
if (!newptr) strip_info->tx_dropped++;
|
1508 |
|
|
else
|
1509 |
|
|
{
|
1510 |
|
|
ptr = newptr;
|
1511 |
|
|
strip_info->sx_pps_count++;
|
1512 |
|
|
strip_info->tx_packets++; /* Count another successful packet */
|
1513 |
|
|
#ifdef EXT_COUNTERS
|
1514 |
|
|
strip_info->tx_bytes += skb->len;
|
1515 |
|
|
strip_info->tx_rbytes += ptr - strip_info->tx_buff;
|
1516 |
|
|
#endif
|
1517 |
|
|
/*DumpData("Sending:", strip_info, strip_info->tx_buff, ptr);*/
|
1518 |
|
|
/*HexDump("Sending", strip_info, strip_info->tx_buff, ptr);*/
|
1519 |
|
|
}
|
1520 |
|
|
}
|
1521 |
|
|
|
1522 |
|
|
/*
|
1523 |
|
|
* 2. If it is time for another tickle, tack it on, after the packet
|
1524 |
|
|
*/
|
1525 |
|
|
if (doprobe)
|
1526 |
|
|
{
|
1527 |
|
|
StringDescriptor ts = CommandString[strip_info->next_command];
|
1528 |
|
|
#if TICKLE_TIMERS
|
1529 |
|
|
{
|
1530 |
|
|
struct timeval tv;
|
1531 |
|
|
do_gettimeofday(&tv);
|
1532 |
|
|
printk(KERN_INFO "**** Sending tickle string %d at %02d.%06d\n",
|
1533 |
|
|
strip_info->next_command, tv.tv_sec % 100, tv.tv_usec);
|
1534 |
|
|
}
|
1535 |
|
|
#endif
|
1536 |
|
|
if (ptr == strip_info->tx_buff) *ptr++ = 0x0D;
|
1537 |
|
|
|
1538 |
|
|
*ptr++ = '*'; /* First send "**" to provoke an error message */
|
1539 |
|
|
*ptr++ = '*';
|
1540 |
|
|
|
1541 |
|
|
/* Then add the command */
|
1542 |
|
|
memcpy(ptr, ts.string, ts.length);
|
1543 |
|
|
|
1544 |
|
|
/* Add a checksum ? */
|
1545 |
|
|
if (strip_info->firmware_level < ChecksummedMessages) ptr += ts.length;
|
1546 |
|
|
else ptr = add_checksum(ptr, ptr + ts.length);
|
1547 |
|
|
|
1548 |
|
|
*ptr++ = 0x0D; /* Terminate the command with a <CR> */
|
1549 |
|
|
|
1550 |
|
|
/* Cycle to next periodic command? */
|
1551 |
|
|
if (strip_info->firmware_level >= StructuredMessages)
|
1552 |
|
|
if (++strip_info->next_command >= ELEMENTS_OF(CommandString))
|
1553 |
|
|
strip_info->next_command = 0;
|
1554 |
|
|
#ifdef EXT_COUNTERS
|
1555 |
|
|
strip_info->tx_ebytes += ts.length;
|
1556 |
|
|
#endif
|
1557 |
|
|
strip_info->watchdog_doprobe = jiffies + 10 * HZ;
|
1558 |
|
|
strip_info->watchdog_doreset = jiffies + 1 * HZ;
|
1559 |
|
|
/*printk(KERN_INFO "%s: Routine radio test.\n", strip_info->dev.name);*/
|
1560 |
|
|
}
|
1561 |
|
|
|
1562 |
|
|
/*
|
1563 |
|
|
* 3. Set up the strip_info ready to send the data (if any).
|
1564 |
|
|
*/
|
1565 |
|
|
strip_info->tx_head = strip_info->tx_buff;
|
1566 |
|
|
strip_info->tx_left = ptr - strip_info->tx_buff;
|
1567 |
|
|
strip_info->tty->flags |= (1 << TTY_DO_WRITE_WAKEUP);
|
1568 |
|
|
|
1569 |
|
|
/*
|
1570 |
|
|
* 4. Debugging check to make sure we're not overflowing the buffer.
|
1571 |
|
|
*/
|
1572 |
|
|
if (strip_info->tx_size - strip_info->tx_left < 20)
|
1573 |
|
|
printk(KERN_ERR "%s: Sending%5d bytes;%5d bytes free.\n", strip_info->dev.name,
|
1574 |
|
|
strip_info->tx_left, strip_info->tx_size - strip_info->tx_left);
|
1575 |
|
|
|
1576 |
|
|
/*
|
1577 |
|
|
* 5. If watchdog has expired, reset the radio. Note: if there's data waiting in
|
1578 |
|
|
* the buffer, strip_write_some_more will send it after the reset has finished
|
1579 |
|
|
*/
|
1580 |
|
|
if (doreset) { ResetRadio(strip_info); return; }
|
1581 |
|
|
|
1582 |
|
|
if (1) {
|
1583 |
|
|
struct in_device *in_dev = in_dev_get(&strip_info->dev);
|
1584 |
|
|
brd = addr = 0;
|
1585 |
|
|
if (in_dev) {
|
1586 |
|
|
read_lock(&in_dev->lock);
|
1587 |
|
|
if (in_dev->ifa_list) {
|
1588 |
|
|
brd = in_dev->ifa_list->ifa_broadcast;
|
1589 |
|
|
addr = in_dev->ifa_list->ifa_local;
|
1590 |
|
|
}
|
1591 |
|
|
read_unlock(&in_dev->lock);
|
1592 |
|
|
in_dev_put(in_dev);
|
1593 |
|
|
}
|
1594 |
|
|
}
|
1595 |
|
|
|
1596 |
|
|
|
1597 |
|
|
/*
|
1598 |
|
|
* 6. If it is time for a periodic ARP, queue one up to be sent.
|
1599 |
|
|
* We only do this if:
|
1600 |
|
|
* 1. The radio is working
|
1601 |
|
|
* 2. It's time to send another periodic ARP
|
1602 |
|
|
* 3. We really know what our address is (and it is not manually set to zero)
|
1603 |
|
|
* 4. We have a designated broadcast address configured
|
1604 |
|
|
* If we queue up an ARP packet when we don't have a designated broadcast
|
1605 |
|
|
* address configured, then the packet will just have to be discarded in
|
1606 |
|
|
* strip_make_packet. This is not fatal, but it causes misleading information
|
1607 |
|
|
* to be displayed in tcpdump. tcpdump will report that periodic APRs are
|
1608 |
|
|
* being sent, when in fact they are not, because they are all being dropped
|
1609 |
|
|
* in the strip_make_packet routine.
|
1610 |
|
|
*/
|
1611 |
|
|
if (strip_info->working && (long)jiffies - strip_info->gratuitous_arp >= 0 &&
|
1612 |
|
|
memcmp(strip_info->dev.dev_addr, zero_address.c, sizeof(zero_address)) &&
|
1613 |
|
|
arp_query(haddr.c, brd, &strip_info->dev))
|
1614 |
|
|
{
|
1615 |
|
|
/*printk(KERN_INFO "%s: Sending gratuitous ARP with interval %ld\n",
|
1616 |
|
|
strip_info->dev.name, strip_info->arp_interval / HZ);*/
|
1617 |
|
|
strip_info->gratuitous_arp = jiffies + strip_info->arp_interval;
|
1618 |
|
|
strip_info->arp_interval *= 2;
|
1619 |
|
|
if (strip_info->arp_interval > MaxARPInterval)
|
1620 |
|
|
strip_info->arp_interval = MaxARPInterval;
|
1621 |
|
|
if (addr)
|
1622 |
|
|
arp_send(
|
1623 |
|
|
ARPOP_REPLY, ETH_P_ARP,
|
1624 |
|
|
addr, /* Target address of ARP packet is our address */
|
1625 |
|
|
&strip_info->dev, /* Device to send packet on */
|
1626 |
|
|
addr, /* Source IP address this ARP packet comes from */
|
1627 |
|
|
NULL, /* Destination HW address is NULL (broadcast it) */
|
1628 |
|
|
strip_info->dev.dev_addr, /* Source HW address is our HW address */
|
1629 |
|
|
strip_info->dev.dev_addr); /* Target HW address is our HW address (redundant) */
|
1630 |
|
|
}
|
1631 |
|
|
|
1632 |
|
|
/*
|
1633 |
|
|
* 7. All ready. Start the transmission
|
1634 |
|
|
*/
|
1635 |
|
|
strip_write_some_more(strip_info->tty);
|
1636 |
|
|
}
|
1637 |
|
|
|
1638 |
|
|
/* Encapsulate a datagram and kick it into a TTY queue. */
|
1639 |
|
|
static int strip_xmit(struct sk_buff *skb, struct net_device *dev)
|
1640 |
|
|
{
|
1641 |
|
|
struct strip *strip_info = (struct strip *)(dev->priv);
|
1642 |
|
|
|
1643 |
|
|
if (!netif_running(dev))
|
1644 |
|
|
{
|
1645 |
|
|
printk(KERN_ERR "%s: xmit call when iface is down\n", dev->name);
|
1646 |
|
|
return(1);
|
1647 |
|
|
}
|
1648 |
|
|
|
1649 |
|
|
netif_stop_queue(dev);
|
1650 |
|
|
|
1651 |
|
|
del_timer(&strip_info->idle_timer);
|
1652 |
|
|
|
1653 |
|
|
/* See if someone has been ifconfigging */
|
1654 |
|
|
if (strip_info->mtu != strip_info->dev.mtu)
|
1655 |
|
|
strip_changedmtu(strip_info);
|
1656 |
|
|
|
1657 |
|
|
if (jiffies - strip_info->pps_timer > HZ)
|
1658 |
|
|
{
|
1659 |
|
|
unsigned long t = jiffies - strip_info->pps_timer;
|
1660 |
|
|
unsigned long rx_pps_count = (strip_info->rx_pps_count * HZ * 8 + t/2) / t;
|
1661 |
|
|
unsigned long tx_pps_count = (strip_info->tx_pps_count * HZ * 8 + t/2) / t;
|
1662 |
|
|
unsigned long sx_pps_count = (strip_info->sx_pps_count * HZ * 8 + t/2) / t;
|
1663 |
|
|
|
1664 |
|
|
strip_info->pps_timer = jiffies;
|
1665 |
|
|
strip_info->rx_pps_count = 0;
|
1666 |
|
|
strip_info->tx_pps_count = 0;
|
1667 |
|
|
strip_info->sx_pps_count = 0;
|
1668 |
|
|
|
1669 |
|
|
strip_info->rx_average_pps = (strip_info->rx_average_pps + rx_pps_count + 1) / 2;
|
1670 |
|
|
strip_info->tx_average_pps = (strip_info->tx_average_pps + tx_pps_count + 1) / 2;
|
1671 |
|
|
strip_info->sx_average_pps = (strip_info->sx_average_pps + sx_pps_count + 1) / 2;
|
1672 |
|
|
|
1673 |
|
|
if (rx_pps_count / 8 >= 10)
|
1674 |
|
|
printk(KERN_INFO "%s: WARNING: Receiving %ld packets per second.\n",
|
1675 |
|
|
strip_info->dev.name, rx_pps_count / 8);
|
1676 |
|
|
if (tx_pps_count / 8 >= 10)
|
1677 |
|
|
printk(KERN_INFO "%s: WARNING: Tx %ld packets per second.\n",
|
1678 |
|
|
strip_info->dev.name, tx_pps_count / 8);
|
1679 |
|
|
if (sx_pps_count / 8 >= 10)
|
1680 |
|
|
printk(KERN_INFO "%s: WARNING: Sending %ld packets per second.\n",
|
1681 |
|
|
strip_info->dev.name, sx_pps_count / 8);
|
1682 |
|
|
}
|
1683 |
|
|
|
1684 |
|
|
strip_send(strip_info, skb);
|
1685 |
|
|
|
1686 |
|
|
if (skb)
|
1687 |
|
|
dev_kfree_skb(skb);
|
1688 |
|
|
return(0);
|
1689 |
|
|
}
|
1690 |
|
|
|
1691 |
|
|
/*
|
1692 |
|
|
* IdleTask periodically calls strip_xmit, so even when we have no IP packets
|
1693 |
|
|
* to send for an extended period of time, the watchdog processing still gets
|
1694 |
|
|
* done to ensure that the radio stays in Starmode
|
1695 |
|
|
*/
|
1696 |
|
|
|
1697 |
|
|
static void strip_IdleTask(unsigned long parameter)
|
1698 |
|
|
{
|
1699 |
|
|
strip_xmit(NULL, (struct net_device *)parameter);
|
1700 |
|
|
}
|
1701 |
|
|
|
1702 |
|
|
/*
|
1703 |
|
|
* Create the MAC header for an arbitrary protocol layer
|
1704 |
|
|
*
|
1705 |
|
|
* saddr!=NULL means use this specific address (n/a for Metricom)
|
1706 |
|
|
* saddr==NULL means use default device source address
|
1707 |
|
|
* daddr!=NULL means use this destination address
|
1708 |
|
|
* daddr==NULL means leave destination address alone
|
1709 |
|
|
* (e.g. unresolved arp -- kernel will call
|
1710 |
|
|
* rebuild_header later to fill in the address)
|
1711 |
|
|
*/
|
1712 |
|
|
|
1713 |
|
|
static int strip_header(struct sk_buff *skb, struct net_device *dev,
|
1714 |
|
|
unsigned short type, void *daddr, void *saddr, unsigned len)
|
1715 |
|
|
{
|
1716 |
|
|
struct strip *strip_info = (struct strip *)(dev->priv);
|
1717 |
|
|
STRIP_Header *header = (STRIP_Header *)skb_push(skb, sizeof(STRIP_Header));
|
1718 |
|
|
|
1719 |
|
|
/*printk(KERN_INFO "%s: strip_header 0x%04X %s\n", dev->name, type,
|
1720 |
|
|
type == ETH_P_IP ? "IP" : type == ETH_P_ARP ? "ARP" : "");*/
|
1721 |
|
|
|
1722 |
|
|
header->src_addr = strip_info->true_dev_addr;
|
1723 |
|
|
header->protocol = htons(type);
|
1724 |
|
|
|
1725 |
|
|
/*HexDump("strip_header", (struct strip *)(dev->priv), skb->data, skb->data + skb->len);*/
|
1726 |
|
|
|
1727 |
|
|
if (!daddr) return(-dev->hard_header_len);
|
1728 |
|
|
|
1729 |
|
|
header->dst_addr = *(MetricomAddress*)daddr;
|
1730 |
|
|
return(dev->hard_header_len);
|
1731 |
|
|
}
|
1732 |
|
|
|
1733 |
|
|
/*
|
1734 |
|
|
* Rebuild the MAC header. This is called after an ARP
|
1735 |
|
|
* (or in future other address resolution) has completed on this
|
1736 |
|
|
* sk_buff. We now let ARP fill in the other fields.
|
1737 |
|
|
* I think this should return zero if packet is ready to send,
|
1738 |
|
|
* or non-zero if it needs more time to do an address lookup
|
1739 |
|
|
*/
|
1740 |
|
|
|
1741 |
|
|
static int strip_rebuild_header(struct sk_buff *skb)
|
1742 |
|
|
{
|
1743 |
|
|
#ifdef CONFIG_INET
|
1744 |
|
|
STRIP_Header *header = (STRIP_Header *) skb->data;
|
1745 |
|
|
|
1746 |
|
|
/* Arp find returns zero if if knows the address, */
|
1747 |
|
|
/* or if it doesn't know the address it sends an ARP packet and returns non-zero */
|
1748 |
|
|
return arp_find(header->dst_addr.c, skb)? 1 : 0;
|
1749 |
|
|
#else
|
1750 |
|
|
return 0;
|
1751 |
|
|
#endif
|
1752 |
|
|
}
|
1753 |
|
|
|
1754 |
|
|
|
1755 |
|
|
/************************************************************************/
|
1756 |
|
|
/* Receiving routines */
|
1757 |
|
|
|
1758 |
|
|
static int strip_receive_room(struct tty_struct *tty)
|
1759 |
|
|
{
|
1760 |
|
|
return 0x10000; /* We can handle an infinite amount of data. :-) */
|
1761 |
|
|
}
|
1762 |
|
|
|
1763 |
|
|
/*
|
1764 |
|
|
* This function parses the response to the ATS300? command,
|
1765 |
|
|
* extracting the radio version and serial number.
|
1766 |
|
|
*/
|
1767 |
|
|
static void get_radio_version(struct strip *strip_info, __u8 *ptr, __u8 *end)
|
1768 |
|
|
{
|
1769 |
|
|
__u8 *p, *value_begin, *value_end;
|
1770 |
|
|
int len;
|
1771 |
|
|
|
1772 |
|
|
/* Determine the beginning of the second line of the payload */
|
1773 |
|
|
p = ptr;
|
1774 |
|
|
while (p < end && *p != 10) p++;
|
1775 |
|
|
if (p >= end) return;
|
1776 |
|
|
p++;
|
1777 |
|
|
value_begin = p;
|
1778 |
|
|
|
1779 |
|
|
/* Determine the end of line */
|
1780 |
|
|
while (p < end && *p != 10) p++;
|
1781 |
|
|
if (p >= end) return;
|
1782 |
|
|
value_end = p;
|
1783 |
|
|
p++;
|
1784 |
|
|
|
1785 |
|
|
len = value_end - value_begin;
|
1786 |
|
|
len = MIN(len, sizeof(FirmwareVersion) - 1);
|
1787 |
|
|
if (strip_info->firmware_version.c[0] == 0)
|
1788 |
|
|
printk(KERN_INFO "%s: Radio Firmware: %.*s\n",
|
1789 |
|
|
strip_info->dev.name, len, value_begin);
|
1790 |
|
|
sprintf(strip_info->firmware_version.c, "%.*s", len, value_begin);
|
1791 |
|
|
|
1792 |
|
|
/* Look for the first colon */
|
1793 |
|
|
while (p < end && *p != ':') p++;
|
1794 |
|
|
if (p >= end) return;
|
1795 |
|
|
/* Skip over the space */
|
1796 |
|
|
p += 2;
|
1797 |
|
|
len = sizeof(SerialNumber) - 1;
|
1798 |
|
|
if (p + len <= end) {
|
1799 |
|
|
sprintf(strip_info->serial_number.c, "%.*s", len, p);
|
1800 |
|
|
}
|
1801 |
|
|
else {
|
1802 |
|
|
printk(KERN_DEBUG "STRIP: radio serial number shorter (%d) than expected (%d)\n",
|
1803 |
|
|
end - p, len);
|
1804 |
|
|
}
|
1805 |
|
|
}
|
1806 |
|
|
|
1807 |
|
|
/*
|
1808 |
|
|
* This function parses the response to the ATS325? command,
|
1809 |
|
|
* extracting the radio battery voltage.
|
1810 |
|
|
*/
|
1811 |
|
|
static void get_radio_voltage(struct strip *strip_info, __u8 *ptr, __u8 *end)
|
1812 |
|
|
{
|
1813 |
|
|
int len;
|
1814 |
|
|
|
1815 |
|
|
len = sizeof(BatteryVoltage) - 1;
|
1816 |
|
|
if (ptr + len <= end) {
|
1817 |
|
|
sprintf(strip_info->battery_voltage.c, "%.*s", len, ptr);
|
1818 |
|
|
}
|
1819 |
|
|
else {
|
1820 |
|
|
printk(KERN_DEBUG "STRIP: radio voltage string shorter (%d) than expected (%d)\n",
|
1821 |
|
|
end - ptr, len);
|
1822 |
|
|
}
|
1823 |
|
|
}
|
1824 |
|
|
|
1825 |
|
|
/*
|
1826 |
|
|
* This function parses the responses to the AT~LA and ATS311 commands,
|
1827 |
|
|
* which list the radio's neighbours.
|
1828 |
|
|
*/
|
1829 |
|
|
static void get_radio_neighbours(MetricomNodeTable *table, __u8 *ptr, __u8 *end)
|
1830 |
|
|
{
|
1831 |
|
|
table->num_nodes = 0;
|
1832 |
|
|
while (ptr < end && table->num_nodes < NODE_TABLE_SIZE)
|
1833 |
|
|
{
|
1834 |
|
|
MetricomNode *node = &table->node[table->num_nodes++];
|
1835 |
|
|
char *dst = node->c, *limit = dst + sizeof(*node) - 1;
|
1836 |
|
|
while (ptr < end && *ptr <= 32) ptr++;
|
1837 |
|
|
while (ptr < end && dst < limit && *ptr != 10) *dst++ = *ptr++;
|
1838 |
|
|
*dst++ = 0;
|
1839 |
|
|
while (ptr < end && ptr[-1] != 10) ptr++;
|
1840 |
|
|
}
|
1841 |
|
|
do_gettimeofday(&table->timestamp);
|
1842 |
|
|
}
|
1843 |
|
|
|
1844 |
|
|
static int get_radio_address(struct strip *strip_info, __u8 *p)
|
1845 |
|
|
{
|
1846 |
|
|
MetricomAddress addr;
|
1847 |
|
|
|
1848 |
|
|
if (string_to_radio_address(&addr, p)) return(1);
|
1849 |
|
|
|
1850 |
|
|
/* See if our radio address has changed */
|
1851 |
|
|
if (memcmp(strip_info->true_dev_addr.c, addr.c, sizeof(addr)))
|
1852 |
|
|
{
|
1853 |
|
|
MetricomAddressString addr_string;
|
1854 |
|
|
radio_address_to_string(&addr, &addr_string);
|
1855 |
|
|
printk(KERN_INFO "%s: Radio address = %s\n", strip_info->dev.name, addr_string.c);
|
1856 |
|
|
strip_info->true_dev_addr = addr;
|
1857 |
|
|
if (!strip_info->manual_dev_addr) *(MetricomAddress*)strip_info->dev.dev_addr = addr;
|
1858 |
|
|
/* Give the radio a few seconds to get its head straight, then send an arp */
|
1859 |
|
|
strip_info->gratuitous_arp = jiffies + 15 * HZ;
|
1860 |
|
|
strip_info->arp_interval = 1 * HZ;
|
1861 |
|
|
}
|
1862 |
|
|
return(0);
|
1863 |
|
|
}
|
1864 |
|
|
|
1865 |
|
|
static int verify_checksum(struct strip *strip_info)
|
1866 |
|
|
{
|
1867 |
|
|
__u8 *p = strip_info->sx_buff;
|
1868 |
|
|
__u8 *end = strip_info->sx_buff + strip_info->sx_count - 4;
|
1869 |
|
|
u_short sum = (READHEX16(end[0]) << 12) | (READHEX16(end[1]) << 8) |
|
1870 |
|
|
(READHEX16(end[2]) << 4) | (READHEX16(end[3]));
|
1871 |
|
|
while (p < end) sum -= *p++;
|
1872 |
|
|
if (sum == 0 && strip_info->firmware_level == StructuredMessages)
|
1873 |
|
|
{
|
1874 |
|
|
strip_info->firmware_level = ChecksummedMessages;
|
1875 |
|
|
printk(KERN_INFO "%s: Radio provides message checksums\n", strip_info->dev.name);
|
1876 |
|
|
}
|
1877 |
|
|
return(sum == 0);
|
1878 |
|
|
}
|
1879 |
|
|
|
1880 |
|
|
static void RecvErr(char *msg, struct strip *strip_info)
|
1881 |
|
|
{
|
1882 |
|
|
__u8 *ptr = strip_info->sx_buff;
|
1883 |
|
|
__u8 *end = strip_info->sx_buff + strip_info->sx_count;
|
1884 |
|
|
DumpData(msg, strip_info, ptr, end);
|
1885 |
|
|
strip_info->rx_errors++;
|
1886 |
|
|
}
|
1887 |
|
|
|
1888 |
|
|
static void RecvErr_Message(struct strip *strip_info, __u8 *sendername, const __u8 *msg, u_long len)
|
1889 |
|
|
{
|
1890 |
|
|
if (has_prefix(msg, len, "001")) /* Not in StarMode! */
|
1891 |
|
|
{
|
1892 |
|
|
RecvErr("Error Msg:", strip_info);
|
1893 |
|
|
printk(KERN_INFO "%s: Radio %s is not in StarMode\n",
|
1894 |
|
|
strip_info->dev.name, sendername);
|
1895 |
|
|
}
|
1896 |
|
|
|
1897 |
|
|
else if (has_prefix(msg, len, "002")) /* Remap handle */
|
1898 |
|
|
{
|
1899 |
|
|
/* We ignore "Remap handle" messages for now */
|
1900 |
|
|
}
|
1901 |
|
|
|
1902 |
|
|
else if (has_prefix(msg, len, "003")) /* Can't resolve name */
|
1903 |
|
|
{
|
1904 |
|
|
RecvErr("Error Msg:", strip_info);
|
1905 |
|
|
printk(KERN_INFO "%s: Destination radio name is unknown\n",
|
1906 |
|
|
strip_info->dev.name);
|
1907 |
|
|
}
|
1908 |
|
|
|
1909 |
|
|
else if (has_prefix(msg, len, "004")) /* Name too small or missing */
|
1910 |
|
|
{
|
1911 |
|
|
strip_info->watchdog_doreset = jiffies + LongTime;
|
1912 |
|
|
#if TICKLE_TIMERS
|
1913 |
|
|
{
|
1914 |
|
|
struct timeval tv;
|
1915 |
|
|
do_gettimeofday(&tv);
|
1916 |
|
|
printk(KERN_INFO "**** Got ERR_004 response at %02d.%06d\n",
|
1917 |
|
|
tv.tv_sec % 100, tv.tv_usec);
|
1918 |
|
|
}
|
1919 |
|
|
#endif
|
1920 |
|
|
if (!strip_info->working)
|
1921 |
|
|
{
|
1922 |
|
|
strip_info->working = TRUE;
|
1923 |
|
|
printk(KERN_INFO "%s: Radio now in starmode\n", strip_info->dev.name);
|
1924 |
|
|
/*
|
1925 |
|
|
* If the radio has just entered a working state, we should do our first
|
1926 |
|
|
* probe ASAP, so that we find out our radio address etc. without delay.
|
1927 |
|
|
*/
|
1928 |
|
|
strip_info->watchdog_doprobe = jiffies;
|
1929 |
|
|
}
|
1930 |
|
|
if (strip_info->firmware_level == NoStructure && sendername)
|
1931 |
|
|
{
|
1932 |
|
|
strip_info->firmware_level = StructuredMessages;
|
1933 |
|
|
strip_info->next_command = 0; /* Try to enable checksums ASAP */
|
1934 |
|
|
printk(KERN_INFO "%s: Radio provides structured messages\n", strip_info->dev.name);
|
1935 |
|
|
}
|
1936 |
|
|
if (strip_info->firmware_level >= StructuredMessages)
|
1937 |
|
|
{
|
1938 |
|
|
/*
|
1939 |
|
|
* If this message has a valid checksum on the end, then the call to verify_checksum
|
1940 |
|
|
* will elevate the firmware_level to ChecksummedMessages for us. (The actual return
|
1941 |
|
|
* code from verify_checksum is ignored here.)
|
1942 |
|
|
*/
|
1943 |
|
|
verify_checksum(strip_info);
|
1944 |
|
|
/*
|
1945 |
|
|
* If the radio has structured messages but we don't yet have all our information about it,
|
1946 |
|
|
* we should do probes without delay, until we have gathered all the information
|
1947 |
|
|
*/
|
1948 |
|
|
if (!GOT_ALL_RADIO_INFO(strip_info)) strip_info->watchdog_doprobe = jiffies;
|
1949 |
|
|
}
|
1950 |
|
|
}
|
1951 |
|
|
|
1952 |
|
|
else if (has_prefix(msg, len, "005")) /* Bad count specification */
|
1953 |
|
|
RecvErr("Error Msg:", strip_info);
|
1954 |
|
|
|
1955 |
|
|
else if (has_prefix(msg, len, "006")) /* Header too big */
|
1956 |
|
|
RecvErr("Error Msg:", strip_info);
|
1957 |
|
|
|
1958 |
|
|
else if (has_prefix(msg, len, "007")) /* Body too big */
|
1959 |
|
|
{
|
1960 |
|
|
RecvErr("Error Msg:", strip_info);
|
1961 |
|
|
printk(KERN_ERR "%s: Error! Packet size too big for radio.\n",
|
1962 |
|
|
strip_info->dev.name);
|
1963 |
|
|
}
|
1964 |
|
|
|
1965 |
|
|
else if (has_prefix(msg, len, "008")) /* Bad character in name */
|
1966 |
|
|
{
|
1967 |
|
|
RecvErr("Error Msg:", strip_info);
|
1968 |
|
|
printk(KERN_ERR "%s: Radio name contains illegal character\n",
|
1969 |
|
|
strip_info->dev.name);
|
1970 |
|
|
}
|
1971 |
|
|
|
1972 |
|
|
else if (has_prefix(msg, len, "009")) /* No count or line terminator */
|
1973 |
|
|
RecvErr("Error Msg:", strip_info);
|
1974 |
|
|
|
1975 |
|
|
else if (has_prefix(msg, len, "010")) /* Invalid checksum */
|
1976 |
|
|
RecvErr("Error Msg:", strip_info);
|
1977 |
|
|
|
1978 |
|
|
else if (has_prefix(msg, len, "011")) /* Checksum didn't match */
|
1979 |
|
|
RecvErr("Error Msg:", strip_info);
|
1980 |
|
|
|
1981 |
|
|
else if (has_prefix(msg, len, "012")) /* Failed to transmit packet */
|
1982 |
|
|
RecvErr("Error Msg:", strip_info);
|
1983 |
|
|
|
1984 |
|
|
else
|
1985 |
|
|
RecvErr("Error Msg:", strip_info);
|
1986 |
|
|
}
|
1987 |
|
|
|
1988 |
|
|
static void process_AT_response(struct strip *strip_info, __u8 *ptr, __u8 *end)
|
1989 |
|
|
{
|
1990 |
|
|
u_long len;
|
1991 |
|
|
__u8 *p = ptr;
|
1992 |
|
|
while (p < end && p[-1] != 10) p++; /* Skip past first newline character */
|
1993 |
|
|
/* Now ptr points to the AT command, and p points to the text of the response. */
|
1994 |
|
|
len = p-ptr;
|
1995 |
|
|
|
1996 |
|
|
#if TICKLE_TIMERS
|
1997 |
|
|
{
|
1998 |
|
|
struct timeval tv;
|
1999 |
|
|
do_gettimeofday(&tv);
|
2000 |
|
|
printk(KERN_INFO "**** Got AT response %.7s at %02d.%06d\n",
|
2001 |
|
|
ptr, tv.tv_sec % 100, tv.tv_usec);
|
2002 |
|
|
}
|
2003 |
|
|
#endif
|
2004 |
|
|
|
2005 |
|
|
if (has_prefix(ptr, len, "ATS300?" )) get_radio_version(strip_info, p, end);
|
2006 |
|
|
else if (has_prefix(ptr, len, "ATS305?" )) get_radio_address(strip_info, p);
|
2007 |
|
|
else if (has_prefix(ptr, len, "ATS311?" )) get_radio_neighbours(&strip_info->poletops, p, end);
|
2008 |
|
|
else if (has_prefix(ptr, len, "ATS319=7")) verify_checksum(strip_info);
|
2009 |
|
|
else if (has_prefix(ptr, len, "ATS325?" )) get_radio_voltage(strip_info, p, end);
|
2010 |
|
|
else if (has_prefix(ptr, len, "AT~LA" )) get_radio_neighbours(&strip_info->portables, p, end);
|
2011 |
|
|
else RecvErr("Unknown AT Response:", strip_info);
|
2012 |
|
|
}
|
2013 |
|
|
|
2014 |
|
|
static void process_ACK(struct strip *strip_info, __u8 *ptr, __u8 *end)
|
2015 |
|
|
{
|
2016 |
|
|
/* Currently we don't do anything with ACKs from the radio */
|
2017 |
|
|
}
|
2018 |
|
|
|
2019 |
|
|
static void process_Info(struct strip *strip_info, __u8 *ptr, __u8 *end)
|
2020 |
|
|
{
|
2021 |
|
|
if (ptr+16 > end) RecvErr("Bad Info Msg:", strip_info);
|
2022 |
|
|
}
|
2023 |
|
|
|
2024 |
|
|
static struct net_device *get_strip_dev(struct strip *strip_info)
|
2025 |
|
|
{
|
2026 |
|
|
/* If our hardware address is *manually set* to zero, and we know our */
|
2027 |
|
|
/* real radio hardware address, try to find another strip device that has been */
|
2028 |
|
|
/* manually set to that address that we can 'transfer ownership' of this packet to */
|
2029 |
|
|
if (strip_info->manual_dev_addr &&
|
2030 |
|
|
!memcmp(strip_info->dev.dev_addr, zero_address.c, sizeof(zero_address)) &&
|
2031 |
|
|
memcmp(&strip_info->true_dev_addr, zero_address.c, sizeof(zero_address)))
|
2032 |
|
|
{
|
2033 |
|
|
struct net_device *dev;
|
2034 |
|
|
read_lock_bh(&dev_base_lock);
|
2035 |
|
|
dev = dev_base;
|
2036 |
|
|
while (dev)
|
2037 |
|
|
{
|
2038 |
|
|
if (dev->type == strip_info->dev.type &&
|
2039 |
|
|
!memcmp(dev->dev_addr, &strip_info->true_dev_addr, sizeof(MetricomAddress)))
|
2040 |
|
|
{
|
2041 |
|
|
printk(KERN_INFO "%s: Transferred packet ownership to %s.\n",
|
2042 |
|
|
strip_info->dev.name, dev->name);
|
2043 |
|
|
read_unlock_bh(&dev_base_lock);
|
2044 |
|
|
return(dev);
|
2045 |
|
|
}
|
2046 |
|
|
dev = dev->next;
|
2047 |
|
|
}
|
2048 |
|
|
read_unlock_bh(&dev_base_lock);
|
2049 |
|
|
}
|
2050 |
|
|
return(&strip_info->dev);
|
2051 |
|
|
}
|
2052 |
|
|
|
2053 |
|
|
/*
|
2054 |
|
|
* Send one completely decapsulated datagram to the next layer.
|
2055 |
|
|
*/
|
2056 |
|
|
|
2057 |
|
|
static void deliver_packet(struct strip *strip_info, STRIP_Header *header, __u16 packetlen)
|
2058 |
|
|
{
|
2059 |
|
|
struct sk_buff *skb = dev_alloc_skb(sizeof(STRIP_Header) + packetlen);
|
2060 |
|
|
if (!skb)
|
2061 |
|
|
{
|
2062 |
|
|
printk(KERN_ERR "%s: memory squeeze, dropping packet.\n", strip_info->dev.name);
|
2063 |
|
|
strip_info->rx_dropped++;
|
2064 |
|
|
}
|
2065 |
|
|
else
|
2066 |
|
|
{
|
2067 |
|
|
memcpy(skb_put(skb, sizeof(STRIP_Header)), header, sizeof(STRIP_Header));
|
2068 |
|
|
memcpy(skb_put(skb, packetlen), strip_info->rx_buff, packetlen);
|
2069 |
|
|
skb->dev = get_strip_dev(strip_info);
|
2070 |
|
|
skb->protocol = header->protocol;
|
2071 |
|
|
skb->mac.raw = skb->data;
|
2072 |
|
|
|
2073 |
|
|
/* Having put a fake header on the front of the sk_buff for the */
|
2074 |
|
|
/* benefit of tools like tcpdump, skb_pull now 'consumes' that */
|
2075 |
|
|
/* fake header before we hand the packet up to the next layer. */
|
2076 |
|
|
skb_pull(skb, sizeof(STRIP_Header));
|
2077 |
|
|
|
2078 |
|
|
/* Finally, hand the packet up to the next layer (e.g. IP or ARP, etc.) */
|
2079 |
|
|
strip_info->rx_packets++;
|
2080 |
|
|
strip_info->rx_pps_count++;
|
2081 |
|
|
#ifdef EXT_COUNTERS
|
2082 |
|
|
strip_info->rx_bytes += packetlen;
|
2083 |
|
|
#endif
|
2084 |
|
|
netif_rx(skb);
|
2085 |
|
|
}
|
2086 |
|
|
}
|
2087 |
|
|
|
2088 |
|
|
static void process_IP_packet(struct strip *strip_info, STRIP_Header *header, __u8 *ptr, __u8 *end)
|
2089 |
|
|
{
|
2090 |
|
|
__u16 packetlen;
|
2091 |
|
|
|
2092 |
|
|
/* Decode start of the IP packet header */
|
2093 |
|
|
ptr = UnStuffData(ptr, end, strip_info->rx_buff, 4);
|
2094 |
|
|
if (!ptr)
|
2095 |
|
|
{
|
2096 |
|
|
RecvErr("IP Packet too short", strip_info);
|
2097 |
|
|
return;
|
2098 |
|
|
}
|
2099 |
|
|
|
2100 |
|
|
packetlen = ((__u16)strip_info->rx_buff[2] << 8) | strip_info->rx_buff[3];
|
2101 |
|
|
|
2102 |
|
|
if (packetlen > MAX_RECV_MTU)
|
2103 |
|
|
{
|
2104 |
|
|
printk(KERN_INFO "%s: Dropping oversized received IP packet: %d bytes\n",
|
2105 |
|
|
strip_info->dev.name, packetlen);
|
2106 |
|
|
strip_info->rx_dropped++;
|
2107 |
|
|
return;
|
2108 |
|
|
}
|
2109 |
|
|
|
2110 |
|
|
/*printk(KERN_INFO "%s: Got %d byte IP packet\n", strip_info->dev.name, packetlen);*/
|
2111 |
|
|
|
2112 |
|
|
/* Decode remainder of the IP packet */
|
2113 |
|
|
ptr = UnStuffData(ptr, end, strip_info->rx_buff+4, packetlen-4);
|
2114 |
|
|
if (!ptr)
|
2115 |
|
|
{
|
2116 |
|
|
RecvErr("IP Packet too short", strip_info);
|
2117 |
|
|
return;
|
2118 |
|
|
}
|
2119 |
|
|
|
2120 |
|
|
if (ptr < end)
|
2121 |
|
|
{
|
2122 |
|
|
RecvErr("IP Packet too long", strip_info);
|
2123 |
|
|
return;
|
2124 |
|
|
}
|
2125 |
|
|
|
2126 |
|
|
header->protocol = htons(ETH_P_IP);
|
2127 |
|
|
|
2128 |
|
|
deliver_packet(strip_info, header, packetlen);
|
2129 |
|
|
}
|
2130 |
|
|
|
2131 |
|
|
static void process_ARP_packet(struct strip *strip_info, STRIP_Header *header, __u8 *ptr, __u8 *end)
|
2132 |
|
|
{
|
2133 |
|
|
__u16 packetlen;
|
2134 |
|
|
struct arphdr *arphdr = (struct arphdr *)strip_info->rx_buff;
|
2135 |
|
|
|
2136 |
|
|
/* Decode start of the ARP packet */
|
2137 |
|
|
ptr = UnStuffData(ptr, end, strip_info->rx_buff, 8);
|
2138 |
|
|
if (!ptr)
|
2139 |
|
|
{
|
2140 |
|
|
RecvErr("ARP Packet too short", strip_info);
|
2141 |
|
|
return;
|
2142 |
|
|
}
|
2143 |
|
|
|
2144 |
|
|
packetlen = 8 + (arphdr->ar_hln + arphdr->ar_pln) * 2;
|
2145 |
|
|
|
2146 |
|
|
if (packetlen > MAX_RECV_MTU)
|
2147 |
|
|
{
|
2148 |
|
|
printk(KERN_INFO "%s: Dropping oversized received ARP packet: %d bytes\n",
|
2149 |
|
|
strip_info->dev.name, packetlen);
|
2150 |
|
|
strip_info->rx_dropped++;
|
2151 |
|
|
return;
|
2152 |
|
|
}
|
2153 |
|
|
|
2154 |
|
|
/*printk(KERN_INFO "%s: Got %d byte ARP %s\n",
|
2155 |
|
|
strip_info->dev.name, packetlen,
|
2156 |
|
|
ntohs(arphdr->ar_op) == ARPOP_REQUEST ? "request" : "reply");*/
|
2157 |
|
|
|
2158 |
|
|
/* Decode remainder of the ARP packet */
|
2159 |
|
|
ptr = UnStuffData(ptr, end, strip_info->rx_buff+8, packetlen-8);
|
2160 |
|
|
if (!ptr)
|
2161 |
|
|
{
|
2162 |
|
|
RecvErr("ARP Packet too short", strip_info);
|
2163 |
|
|
return;
|
2164 |
|
|
}
|
2165 |
|
|
|
2166 |
|
|
if (ptr < end)
|
2167 |
|
|
{
|
2168 |
|
|
RecvErr("ARP Packet too long", strip_info);
|
2169 |
|
|
return;
|
2170 |
|
|
}
|
2171 |
|
|
|
2172 |
|
|
header->protocol = htons(ETH_P_ARP);
|
2173 |
|
|
|
2174 |
|
|
deliver_packet(strip_info, header, packetlen);
|
2175 |
|
|
}
|
2176 |
|
|
|
2177 |
|
|
/*
|
2178 |
|
|
* process_text_message processes a <CR>-terminated block of data received
|
2179 |
|
|
* from the radio that doesn't begin with a '*' character. All normal
|
2180 |
|
|
* Starmode communication messages with the radio begin with a '*',
|
2181 |
|
|
* so any text that does not indicates a serial port error, a radio that
|
2182 |
|
|
* is in Hayes command mode instead of Starmode, or a radio with really
|
2183 |
|
|
* old firmware that doesn't frame its Starmode responses properly.
|
2184 |
|
|
*/
|
2185 |
|
|
static void process_text_message(struct strip *strip_info)
|
2186 |
|
|
{
|
2187 |
|
|
__u8 *msg = strip_info->sx_buff;
|
2188 |
|
|
int len = strip_info->sx_count;
|
2189 |
|
|
|
2190 |
|
|
/* Check for anything that looks like it might be our radio name */
|
2191 |
|
|
/* (This is here for backwards compatibility with old firmware) */
|
2192 |
|
|
if (len == 9 && get_radio_address(strip_info, msg) == 0) return;
|
2193 |
|
|
|
2194 |
|
|
if (text_equal(msg, len, "OK" )) return; /* Ignore 'OK' responses from prior commands */
|
2195 |
|
|
if (text_equal(msg, len, "ERROR" )) return; /* Ignore 'ERROR' messages */
|
2196 |
|
|
if (has_prefix(msg, len, "ate0q1" )) return; /* Ignore character echo back from the radio */
|
2197 |
|
|
|
2198 |
|
|
/* Catch other error messages */
|
2199 |
|
|
/* (This is here for backwards compatibility with old firmware) */
|
2200 |
|
|
if (has_prefix(msg, len, "ERR_")) { RecvErr_Message(strip_info, NULL, &msg[4], len-4); return; }
|
2201 |
|
|
|
2202 |
|
|
RecvErr("No initial *", strip_info);
|
2203 |
|
|
}
|
2204 |
|
|
|
2205 |
|
|
/*
|
2206 |
|
|
* process_message processes a <CR>-terminated block of data received
|
2207 |
|
|
* from the radio. If the radio is not in Starmode or has old firmware,
|
2208 |
|
|
* it may be a line of text in response to an AT command. Ideally, with
|
2209 |
|
|
* a current radio that's properly in Starmode, all data received should
|
2210 |
|
|
* be properly framed and checksummed radio message blocks, containing
|
2211 |
|
|
* either a starmode packet, or a other communication from the radio
|
2212 |
|
|
* firmware, like "INF_" Info messages and &COMMAND responses.
|
2213 |
|
|
*/
|
2214 |
|
|
static void process_message(struct strip *strip_info)
|
2215 |
|
|
{
|
2216 |
|
|
STRIP_Header header = { zero_address, zero_address, 0 };
|
2217 |
|
|
__u8 *ptr = strip_info->sx_buff;
|
2218 |
|
|
__u8 *end = strip_info->sx_buff + strip_info->sx_count;
|
2219 |
|
|
__u8 sendername[32], *sptr = sendername;
|
2220 |
|
|
MetricomKey key;
|
2221 |
|
|
|
2222 |
|
|
/*HexDump("Receiving", strip_info, ptr, end);*/
|
2223 |
|
|
|
2224 |
|
|
/* Check for start of address marker, and then skip over it */
|
2225 |
|
|
if (*ptr == '*') ptr++;
|
2226 |
|
|
else { process_text_message(strip_info); return; }
|
2227 |
|
|
|
2228 |
|
|
/* Copy out the return address */
|
2229 |
|
|
while (ptr < end && *ptr != '*' && sptr < ARRAY_END(sendername)-1) *sptr++ = *ptr++;
|
2230 |
|
|
*sptr = 0; /* Null terminate the sender name */
|
2231 |
|
|
|
2232 |
|
|
/* Check for end of address marker, and skip over it */
|
2233 |
|
|
if (ptr >= end || *ptr != '*')
|
2234 |
|
|
{
|
2235 |
|
|
RecvErr("No second *", strip_info);
|
2236 |
|
|
return;
|
2237 |
|
|
}
|
2238 |
|
|
ptr++; /* Skip the second '*' */
|
2239 |
|
|
|
2240 |
|
|
/* If the sender name is "&COMMAND", ignore this 'packet' */
|
2241 |
|
|
/* (This is here for backwards compatibility with old firmware) */
|
2242 |
|
|
if (!strcmp(sendername, "&COMMAND"))
|
2243 |
|
|
{
|
2244 |
|
|
strip_info->firmware_level = NoStructure;
|
2245 |
|
|
strip_info->next_command = CompatibilityCommand;
|
2246 |
|
|
return;
|
2247 |
|
|
}
|
2248 |
|
|
|
2249 |
|
|
if (ptr+4 > end)
|
2250 |
|
|
{
|
2251 |
|
|
RecvErr("No proto key", strip_info);
|
2252 |
|
|
return;
|
2253 |
|
|
}
|
2254 |
|
|
|
2255 |
|
|
/* Get the protocol key out of the buffer */
|
2256 |
|
|
key.c[0] = *ptr++;
|
2257 |
|
|
key.c[1] = *ptr++;
|
2258 |
|
|
key.c[2] = *ptr++;
|
2259 |
|
|
key.c[3] = *ptr++;
|
2260 |
|
|
|
2261 |
|
|
/* If we're using checksums, verify the checksum at the end of the packet */
|
2262 |
|
|
if (strip_info->firmware_level >= ChecksummedMessages)
|
2263 |
|
|
{
|
2264 |
|
|
end -= 4; /* Chop the last four bytes off the packet (they're the checksum) */
|
2265 |
|
|
if (ptr > end)
|
2266 |
|
|
{
|
2267 |
|
|
RecvErr("Missing Checksum", strip_info);
|
2268 |
|
|
return;
|
2269 |
|
|
}
|
2270 |
|
|
if (!verify_checksum(strip_info))
|
2271 |
|
|
{
|
2272 |
|
|
RecvErr("Bad Checksum", strip_info);
|
2273 |
|
|
return;
|
2274 |
|
|
}
|
2275 |
|
|
}
|
2276 |
|
|
|
2277 |
|
|
/*printk(KERN_INFO "%s: Got packet from \"%s\".\n", strip_info->dev.name, sendername);*/
|
2278 |
|
|
|
2279 |
|
|
/*
|
2280 |
|
|
* Fill in (pseudo) source and destination addresses in the packet.
|
2281 |
|
|
* We assume that the destination address was our address (the radio does not
|
2282 |
|
|
* tell us this). If the radio supplies a source address, then we use it.
|
2283 |
|
|
*/
|
2284 |
|
|
header.dst_addr = strip_info->true_dev_addr;
|
2285 |
|
|
string_to_radio_address(&header.src_addr, sendername);
|
2286 |
|
|
|
2287 |
|
|
#ifdef EXT_COUNTERS
|
2288 |
|
|
if (key.l == SIP0Key.l) {
|
2289 |
|
|
strip_info->rx_rbytes += (end - ptr);
|
2290 |
|
|
process_IP_packet(strip_info, &header, ptr, end);
|
2291 |
|
|
} else if (key.l == ARP0Key.l) {
|
2292 |
|
|
strip_info->rx_rbytes += (end - ptr);
|
2293 |
|
|
process_ARP_packet(strip_info, &header, ptr, end);
|
2294 |
|
|
} else if (key.l == ATR_Key.l) {
|
2295 |
|
|
strip_info->rx_ebytes += (end - ptr);
|
2296 |
|
|
process_AT_response(strip_info, ptr, end);
|
2297 |
|
|
} else if (key.l == ACK_Key.l) {
|
2298 |
|
|
strip_info->rx_ebytes += (end - ptr);
|
2299 |
|
|
process_ACK(strip_info, ptr, end);
|
2300 |
|
|
} else if (key.l == INF_Key.l) {
|
2301 |
|
|
strip_info->rx_ebytes += (end - ptr);
|
2302 |
|
|
process_Info(strip_info, ptr, end);
|
2303 |
|
|
} else if (key.l == ERR_Key.l) {
|
2304 |
|
|
strip_info->rx_ebytes += (end - ptr);
|
2305 |
|
|
RecvErr_Message(strip_info, sendername, ptr, end-ptr);
|
2306 |
|
|
} else RecvErr("Unrecognized protocol key", strip_info);
|
2307 |
|
|
#else
|
2308 |
|
|
if (key.l == SIP0Key.l) process_IP_packet (strip_info, &header, ptr, end);
|
2309 |
|
|
else if (key.l == ARP0Key.l) process_ARP_packet (strip_info, &header, ptr, end);
|
2310 |
|
|
else if (key.l == ATR_Key.l) process_AT_response(strip_info, ptr, end);
|
2311 |
|
|
else if (key.l == ACK_Key.l) process_ACK (strip_info, ptr, end);
|
2312 |
|
|
else if (key.l == INF_Key.l) process_Info (strip_info, ptr, end);
|
2313 |
|
|
else if (key.l == ERR_Key.l) RecvErr_Message (strip_info, sendername, ptr, end-ptr);
|
2314 |
|
|
else RecvErr("Unrecognized protocol key", strip_info);
|
2315 |
|
|
#endif
|
2316 |
|
|
}
|
2317 |
|
|
|
2318 |
|
|
#define TTYERROR(X) ((X) == TTY_BREAK ? "Break" : \
|
2319 |
|
|
(X) == TTY_FRAME ? "Framing Error" : \
|
2320 |
|
|
(X) == TTY_PARITY ? "Parity Error" : \
|
2321 |
|
|
(X) == TTY_OVERRUN ? "Hardware Overrun" : "Unknown Error")
|
2322 |
|
|
|
2323 |
|
|
/*
|
2324 |
|
|
* Handle the 'receiver data ready' interrupt.
|
2325 |
|
|
* This function is called by the 'tty_io' module in the kernel when
|
2326 |
|
|
* a block of STRIP data has been received, which can now be decapsulated
|
2327 |
|
|
* and sent on to some IP layer for further processing.
|
2328 |
|
|
*/
|
2329 |
|
|
|
2330 |
|
|
static void
|
2331 |
|
|
strip_receive_buf(struct tty_struct *tty, const unsigned char *cp, char *fp, int count)
|
2332 |
|
|
{
|
2333 |
|
|
struct strip *strip_info = (struct strip *) tty->disc_data;
|
2334 |
|
|
const unsigned char *end = cp + count;
|
2335 |
|
|
|
2336 |
|
|
if (!strip_info || strip_info->magic != STRIP_MAGIC
|
2337 |
|
|
|| !netif_running(&strip_info->dev))
|
2338 |
|
|
return;
|
2339 |
|
|
|
2340 |
|
|
/* Argh! mtu change time! - costs us the packet part received at the change */
|
2341 |
|
|
if (strip_info->mtu != strip_info->dev.mtu)
|
2342 |
|
|
strip_changedmtu(strip_info);
|
2343 |
|
|
|
2344 |
|
|
#if 0
|
2345 |
|
|
{
|
2346 |
|
|
struct timeval tv;
|
2347 |
|
|
do_gettimeofday(&tv);
|
2348 |
|
|
printk(KERN_INFO "**** strip_receive_buf: %3d bytes at %02d.%06d\n",
|
2349 |
|
|
count, tv.tv_sec % 100, tv.tv_usec);
|
2350 |
|
|
}
|
2351 |
|
|
#endif
|
2352 |
|
|
|
2353 |
|
|
#ifdef EXT_COUNTERS
|
2354 |
|
|
strip_info->rx_sbytes += count;
|
2355 |
|
|
#endif
|
2356 |
|
|
|
2357 |
|
|
/* Read the characters out of the buffer */
|
2358 |
|
|
while (cp < end)
|
2359 |
|
|
{
|
2360 |
|
|
if (fp && *fp) printk(KERN_INFO "%s: %s on serial port\n", strip_info->dev.name, TTYERROR(*fp));
|
2361 |
|
|
if (fp && *fp++ && !strip_info->discard) /* If there's a serial error, record it */
|
2362 |
|
|
{
|
2363 |
|
|
/* If we have some characters in the buffer, discard them */
|
2364 |
|
|
strip_info->discard = strip_info->sx_count;
|
2365 |
|
|
strip_info->rx_errors++;
|
2366 |
|
|
}
|
2367 |
|
|
|
2368 |
|
|
/* Leading control characters (CR, NL, Tab, etc.) are ignored */
|
2369 |
|
|
if (strip_info->sx_count > 0 || *cp >= ' ')
|
2370 |
|
|
{
|
2371 |
|
|
if (*cp == 0x0D) /* If end of packet, decide what to do with it */
|
2372 |
|
|
{
|
2373 |
|
|
if (strip_info->sx_count > 3000)
|
2374 |
|
|
printk(KERN_INFO "%s: Cut a %d byte packet (%d bytes remaining)%s\n",
|
2375 |
|
|
strip_info->dev.name, strip_info->sx_count, end-cp-1,
|
2376 |
|
|
strip_info->discard ? " (discarded)" : "");
|
2377 |
|
|
if (strip_info->sx_count > strip_info->sx_size)
|
2378 |
|
|
{
|
2379 |
|
|
strip_info->rx_over_errors++;
|
2380 |
|
|
printk(KERN_INFO "%s: sx_buff overflow (%d bytes total)\n",
|
2381 |
|
|
strip_info->dev.name, strip_info->sx_count);
|
2382 |
|
|
}
|
2383 |
|
|
else if (strip_info->discard)
|
2384 |
|
|
printk(KERN_INFO "%s: Discarding bad packet (%d/%d)\n",
|
2385 |
|
|
strip_info->dev.name, strip_info->discard, strip_info->sx_count);
|
2386 |
|
|
else process_message(strip_info);
|
2387 |
|
|
strip_info->discard = 0;
|
2388 |
|
|
strip_info->sx_count = 0;
|
2389 |
|
|
}
|
2390 |
|
|
else
|
2391 |
|
|
{
|
2392 |
|
|
/* Make sure we have space in the buffer */
|
2393 |
|
|
if (strip_info->sx_count < strip_info->sx_size)
|
2394 |
|
|
strip_info->sx_buff[strip_info->sx_count] = *cp;
|
2395 |
|
|
strip_info->sx_count++;
|
2396 |
|
|
}
|
2397 |
|
|
}
|
2398 |
|
|
cp++;
|
2399 |
|
|
}
|
2400 |
|
|
}
|
2401 |
|
|
|
2402 |
|
|
|
2403 |
|
|
/************************************************************************/
|
2404 |
|
|
/* General control routines */
|
2405 |
|
|
|
2406 |
|
|
static int set_mac_address(struct strip *strip_info, MetricomAddress *addr)
|
2407 |
|
|
{
|
2408 |
|
|
/*
|
2409 |
|
|
* We're using a manually specified address if the address is set
|
2410 |
|
|
* to anything other than all ones. Setting the address to all ones
|
2411 |
|
|
* disables manual mode and goes back to automatic address determination
|
2412 |
|
|
* (tracking the true address that the radio has).
|
2413 |
|
|
*/
|
2414 |
|
|
strip_info->manual_dev_addr = memcmp(addr->c, broadcast_address.c, sizeof(broadcast_address));
|
2415 |
|
|
if (strip_info->manual_dev_addr)
|
2416 |
|
|
*(MetricomAddress*)strip_info->dev.dev_addr = *addr;
|
2417 |
|
|
else *(MetricomAddress*)strip_info->dev.dev_addr = strip_info->true_dev_addr;
|
2418 |
|
|
return 0;
|
2419 |
|
|
}
|
2420 |
|
|
|
2421 |
|
|
static int dev_set_mac_address(struct net_device *dev, void *addr)
|
2422 |
|
|
{
|
2423 |
|
|
struct strip *strip_info = (struct strip *)(dev->priv);
|
2424 |
|
|
struct sockaddr *sa = addr;
|
2425 |
|
|
printk(KERN_INFO "%s: strip_set_dev_mac_address called\n", dev->name);
|
2426 |
|
|
set_mac_address(strip_info, (MetricomAddress *)sa->sa_data);
|
2427 |
|
|
return 0;
|
2428 |
|
|
}
|
2429 |
|
|
|
2430 |
|
|
static struct net_device_stats *strip_get_stats(struct net_device *dev)
|
2431 |
|
|
{
|
2432 |
|
|
static struct net_device_stats stats;
|
2433 |
|
|
struct strip *strip_info = (struct strip *)(dev->priv);
|
2434 |
|
|
|
2435 |
|
|
memset(&stats, 0, sizeof(struct net_device_stats));
|
2436 |
|
|
|
2437 |
|
|
stats.rx_packets = strip_info->rx_packets;
|
2438 |
|
|
stats.tx_packets = strip_info->tx_packets;
|
2439 |
|
|
stats.rx_dropped = strip_info->rx_dropped;
|
2440 |
|
|
stats.tx_dropped = strip_info->tx_dropped;
|
2441 |
|
|
stats.tx_errors = strip_info->tx_errors;
|
2442 |
|
|
stats.rx_errors = strip_info->rx_errors;
|
2443 |
|
|
stats.rx_over_errors = strip_info->rx_over_errors;
|
2444 |
|
|
return(&stats);
|
2445 |
|
|
}
|
2446 |
|
|
|
2447 |
|
|
|
2448 |
|
|
/************************************************************************/
|
2449 |
|
|
/* Opening and closing */
|
2450 |
|
|
|
2451 |
|
|
/*
|
2452 |
|
|
* Here's the order things happen:
|
2453 |
|
|
* When the user runs "slattach -p strip ..."
|
2454 |
|
|
* 1. The TTY module calls strip_open
|
2455 |
|
|
* 2. strip_open calls strip_alloc
|
2456 |
|
|
* 3. strip_alloc calls register_netdev
|
2457 |
|
|
* 4. register_netdev calls strip_dev_init
|
2458 |
|
|
* 5. then strip_open finishes setting up the strip_info
|
2459 |
|
|
*
|
2460 |
|
|
* When the user runs "ifconfig st<x> up address netmask ..."
|
2461 |
|
|
* 6. strip_open_low gets called
|
2462 |
|
|
*
|
2463 |
|
|
* When the user runs "ifconfig st<x> down"
|
2464 |
|
|
* 7. strip_close_low gets called
|
2465 |
|
|
*
|
2466 |
|
|
* When the user kills the slattach process
|
2467 |
|
|
* 8. strip_close gets called
|
2468 |
|
|
* 9. strip_close calls dev_close
|
2469 |
|
|
* 10. if the device is still up, then dev_close calls strip_close_low
|
2470 |
|
|
* 11. strip_close calls strip_free
|
2471 |
|
|
*/
|
2472 |
|
|
|
2473 |
|
|
/* Open the low-level part of the STRIP channel. Easy! */
|
2474 |
|
|
|
2475 |
|
|
static int strip_open_low(struct net_device *dev)
|
2476 |
|
|
{
|
2477 |
|
|
struct strip *strip_info = (struct strip *)(dev->priv);
|
2478 |
|
|
#if 0
|
2479 |
|
|
struct in_device *in_dev = dev->ip_ptr;
|
2480 |
|
|
#endif
|
2481 |
|
|
|
2482 |
|
|
if (strip_info->tty == NULL)
|
2483 |
|
|
return(-ENODEV);
|
2484 |
|
|
|
2485 |
|
|
if (!allocate_buffers(strip_info))
|
2486 |
|
|
return(-ENOMEM);
|
2487 |
|
|
|
2488 |
|
|
strip_info->sx_count = 0;
|
2489 |
|
|
strip_info->tx_left = 0;
|
2490 |
|
|
|
2491 |
|
|
strip_info->discard = 0;
|
2492 |
|
|
strip_info->working = FALSE;
|
2493 |
|
|
strip_info->firmware_level = NoStructure;
|
2494 |
|
|
strip_info->next_command = CompatibilityCommand;
|
2495 |
|
|
strip_info->user_baud = get_baud(strip_info->tty);
|
2496 |
|
|
|
2497 |
|
|
#if 0
|
2498 |
|
|
/*
|
2499 |
|
|
* Needed because address '0' is special
|
2500 |
|
|
*
|
2501 |
|
|
* --ANK Needed it or not needed, it does not matter at all.
|
2502 |
|
|
* Make it at user level, guys.
|
2503 |
|
|
*/
|
2504 |
|
|
|
2505 |
|
|
if (in_dev->ifa_list->ifa_address == 0)
|
2506 |
|
|
in_dev->ifa_list->ifa_address = ntohl(0xC0A80001);
|
2507 |
|
|
#endif
|
2508 |
|
|
printk(KERN_INFO "%s: Initializing Radio.\n", strip_info->dev.name);
|
2509 |
|
|
ResetRadio(strip_info);
|
2510 |
|
|
strip_info->idle_timer.expires = jiffies + 1*HZ;
|
2511 |
|
|
add_timer(&strip_info->idle_timer);
|
2512 |
|
|
netif_wake_queue(dev);
|
2513 |
|
|
return(0);
|
2514 |
|
|
}
|
2515 |
|
|
|
2516 |
|
|
|
2517 |
|
|
/*
|
2518 |
|
|
* Close the low-level part of the STRIP channel. Easy!
|
2519 |
|
|
*/
|
2520 |
|
|
|
2521 |
|
|
static int strip_close_low(struct net_device *dev)
|
2522 |
|
|
{
|
2523 |
|
|
struct strip *strip_info = (struct strip *)(dev->priv);
|
2524 |
|
|
|
2525 |
|
|
if (strip_info->tty == NULL)
|
2526 |
|
|
return -EBUSY;
|
2527 |
|
|
strip_info->tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP);
|
2528 |
|
|
|
2529 |
|
|
netif_stop_queue(dev);
|
2530 |
|
|
|
2531 |
|
|
/*
|
2532 |
|
|
* Free all STRIP frame buffers.
|
2533 |
|
|
*/
|
2534 |
|
|
if (strip_info->rx_buff)
|
2535 |
|
|
{
|
2536 |
|
|
kfree(strip_info->rx_buff);
|
2537 |
|
|
strip_info->rx_buff = NULL;
|
2538 |
|
|
}
|
2539 |
|
|
if (strip_info->sx_buff)
|
2540 |
|
|
{
|
2541 |
|
|
kfree(strip_info->sx_buff);
|
2542 |
|
|
strip_info->sx_buff = NULL;
|
2543 |
|
|
}
|
2544 |
|
|
if (strip_info->tx_buff)
|
2545 |
|
|
{
|
2546 |
|
|
kfree(strip_info->tx_buff);
|
2547 |
|
|
strip_info->tx_buff = NULL;
|
2548 |
|
|
}
|
2549 |
|
|
del_timer(&strip_info->idle_timer);
|
2550 |
|
|
return 0;
|
2551 |
|
|
}
|
2552 |
|
|
|
2553 |
|
|
/*
|
2554 |
|
|
* This routine is called by DDI when the
|
2555 |
|
|
* (dynamically assigned) device is registered
|
2556 |
|
|
*/
|
2557 |
|
|
|
2558 |
|
|
static int strip_dev_init(struct net_device *dev)
|
2559 |
|
|
{
|
2560 |
|
|
/*
|
2561 |
|
|
* Finish setting up the DEVICE info.
|
2562 |
|
|
*/
|
2563 |
|
|
|
2564 |
|
|
dev->trans_start = 0;
|
2565 |
|
|
dev->last_rx = 0;
|
2566 |
|
|
dev->tx_queue_len = 30; /* Drop after 30 frames queued */
|
2567 |
|
|
|
2568 |
|
|
dev->flags = 0;
|
2569 |
|
|
dev->mtu = DEFAULT_STRIP_MTU;
|
2570 |
|
|
dev->type = ARPHRD_METRICOM; /* dtang */
|
2571 |
|
|
dev->hard_header_len = sizeof(STRIP_Header);
|
2572 |
|
|
/*
|
2573 |
|
|
* dev->priv Already holds a pointer to our struct strip
|
2574 |
|
|
*/
|
2575 |
|
|
|
2576 |
|
|
*(MetricomAddress*)&dev->broadcast = broadcast_address;
|
2577 |
|
|
dev->dev_addr[0] = 0;
|
2578 |
|
|
dev->addr_len = sizeof(MetricomAddress);
|
2579 |
|
|
|
2580 |
|
|
/*
|
2581 |
|
|
* Pointers to interface service routines.
|
2582 |
|
|
*/
|
2583 |
|
|
|
2584 |
|
|
dev->open = strip_open_low;
|
2585 |
|
|
dev->stop = strip_close_low;
|
2586 |
|
|
dev->hard_start_xmit = strip_xmit;
|
2587 |
|
|
dev->hard_header = strip_header;
|
2588 |
|
|
dev->rebuild_header = strip_rebuild_header;
|
2589 |
|
|
dev->set_mac_address = dev_set_mac_address;
|
2590 |
|
|
dev->get_stats = strip_get_stats;
|
2591 |
|
|
return 0;
|
2592 |
|
|
}
|
2593 |
|
|
|
2594 |
|
|
/*
|
2595 |
|
|
* Free a STRIP channel.
|
2596 |
|
|
*/
|
2597 |
|
|
|
2598 |
|
|
static void strip_free(struct strip *strip_info)
|
2599 |
|
|
{
|
2600 |
|
|
*(strip_info->referrer) = strip_info->next;
|
2601 |
|
|
if (strip_info->next)
|
2602 |
|
|
strip_info->next->referrer = strip_info->referrer;
|
2603 |
|
|
strip_info->magic = 0;
|
2604 |
|
|
kfree(strip_info);
|
2605 |
|
|
}
|
2606 |
|
|
|
2607 |
|
|
/*
|
2608 |
|
|
* Allocate a new free STRIP channel
|
2609 |
|
|
*/
|
2610 |
|
|
|
2611 |
|
|
static struct strip *strip_alloc(void)
|
2612 |
|
|
{
|
2613 |
|
|
int channel_id = 0;
|
2614 |
|
|
struct strip **s = &struct_strip_list;
|
2615 |
|
|
struct strip *strip_info = (struct strip *)
|
2616 |
|
|
kmalloc(sizeof(struct strip), GFP_KERNEL);
|
2617 |
|
|
|
2618 |
|
|
if (!strip_info)
|
2619 |
|
|
return(NULL); /* If no more memory, return */
|
2620 |
|
|
|
2621 |
|
|
/*
|
2622 |
|
|
* Clear the allocated memory
|
2623 |
|
|
*/
|
2624 |
|
|
|
2625 |
|
|
memset(strip_info, 0, sizeof(struct strip));
|
2626 |
|
|
|
2627 |
|
|
/*
|
2628 |
|
|
* Search the list to find where to put our new entry
|
2629 |
|
|
* (and in the process decide what channel number it is
|
2630 |
|
|
* going to be)
|
2631 |
|
|
*/
|
2632 |
|
|
|
2633 |
|
|
while (*s && (*s)->dev.base_addr == channel_id)
|
2634 |
|
|
{
|
2635 |
|
|
channel_id++;
|
2636 |
|
|
s = &(*s)->next;
|
2637 |
|
|
}
|
2638 |
|
|
|
2639 |
|
|
/*
|
2640 |
|
|
* Fill in the link pointers
|
2641 |
|
|
*/
|
2642 |
|
|
|
2643 |
|
|
strip_info->next = *s;
|
2644 |
|
|
if (*s)
|
2645 |
|
|
(*s)->referrer = &strip_info->next;
|
2646 |
|
|
strip_info->referrer = s;
|
2647 |
|
|
*s = strip_info;
|
2648 |
|
|
|
2649 |
|
|
strip_info->magic = STRIP_MAGIC;
|
2650 |
|
|
strip_info->tty = NULL;
|
2651 |
|
|
|
2652 |
|
|
strip_info->gratuitous_arp = jiffies + LongTime;
|
2653 |
|
|
strip_info->arp_interval = 0;
|
2654 |
|
|
init_timer(&strip_info->idle_timer);
|
2655 |
|
|
strip_info->idle_timer.data = (long)&strip_info->dev;
|
2656 |
|
|
strip_info->idle_timer.function = strip_IdleTask;
|
2657 |
|
|
|
2658 |
|
|
/* Note: strip_info->if_name is currently 8 characters long */
|
2659 |
|
|
sprintf(strip_info->dev.name, "st%d", channel_id);
|
2660 |
|
|
strip_info->dev.base_addr = channel_id;
|
2661 |
|
|
strip_info->dev.priv = (void*)strip_info;
|
2662 |
|
|
strip_info->dev.next = NULL;
|
2663 |
|
|
strip_info->dev.init = strip_dev_init;
|
2664 |
|
|
|
2665 |
|
|
return(strip_info);
|
2666 |
|
|
}
|
2667 |
|
|
|
2668 |
|
|
/*
|
2669 |
|
|
* Open the high-level part of the STRIP channel.
|
2670 |
|
|
* This function is called by the TTY module when the
|
2671 |
|
|
* STRIP line discipline is called for. Because we are
|
2672 |
|
|
* sure the tty line exists, we only have to link it to
|
2673 |
|
|
* a free STRIP channel...
|
2674 |
|
|
*/
|
2675 |
|
|
|
2676 |
|
|
static int strip_open(struct tty_struct *tty)
|
2677 |
|
|
{
|
2678 |
|
|
struct strip *strip_info = (struct strip *) tty->disc_data;
|
2679 |
|
|
|
2680 |
|
|
/*
|
2681 |
|
|
* First make sure we're not already connected.
|
2682 |
|
|
*/
|
2683 |
|
|
|
2684 |
|
|
if (strip_info && strip_info->magic == STRIP_MAGIC)
|
2685 |
|
|
return -EEXIST;
|
2686 |
|
|
|
2687 |
|
|
/*
|
2688 |
|
|
* OK. Find a free STRIP channel to use.
|
2689 |
|
|
*/
|
2690 |
|
|
if ((strip_info = strip_alloc()) == NULL)
|
2691 |
|
|
return -ENFILE;
|
2692 |
|
|
|
2693 |
|
|
/*
|
2694 |
|
|
* Register our newly created device so it can be ifconfig'd
|
2695 |
|
|
* strip_dev_init() will be called as a side-effect
|
2696 |
|
|
*/
|
2697 |
|
|
|
2698 |
|
|
if (register_netdev(&strip_info->dev) != 0)
|
2699 |
|
|
{
|
2700 |
|
|
printk(KERN_ERR "strip: register_netdev() failed.\n");
|
2701 |
|
|
strip_free(strip_info);
|
2702 |
|
|
return -ENFILE;
|
2703 |
|
|
}
|
2704 |
|
|
|
2705 |
|
|
strip_info->tty = tty;
|
2706 |
|
|
tty->disc_data = strip_info;
|
2707 |
|
|
if (tty->driver.flush_buffer)
|
2708 |
|
|
tty->driver.flush_buffer(tty);
|
2709 |
|
|
if (tty->ldisc.flush_buffer)
|
2710 |
|
|
tty->ldisc.flush_buffer(tty);
|
2711 |
|
|
|
2712 |
|
|
/*
|
2713 |
|
|
* Restore default settings
|
2714 |
|
|
*/
|
2715 |
|
|
|
2716 |
|
|
strip_info->dev.type = ARPHRD_METRICOM; /* dtang */
|
2717 |
|
|
|
2718 |
|
|
/*
|
2719 |
|
|
* Set tty options
|
2720 |
|
|
*/
|
2721 |
|
|
|
2722 |
|
|
tty->termios->c_iflag |= IGNBRK |IGNPAR;/* Ignore breaks and parity errors. */
|
2723 |
|
|
tty->termios->c_cflag |= CLOCAL; /* Ignore modem control signals. */
|
2724 |
|
|
tty->termios->c_cflag &= ~HUPCL; /* Don't close on hup */
|
2725 |
|
|
|
2726 |
|
|
MOD_INC_USE_COUNT;
|
2727 |
|
|
|
2728 |
|
|
printk(KERN_INFO "STRIP: device \"%s\" activated\n", strip_info->dev.name);
|
2729 |
|
|
|
2730 |
|
|
/*
|
2731 |
|
|
* Done. We have linked the TTY line to a channel.
|
2732 |
|
|
*/
|
2733 |
|
|
return(strip_info->dev.base_addr);
|
2734 |
|
|
}
|
2735 |
|
|
|
2736 |
|
|
/*
|
2737 |
|
|
* Close down a STRIP channel.
|
2738 |
|
|
* This means flushing out any pending queues, and then restoring the
|
2739 |
|
|
* TTY line discipline to what it was before it got hooked to STRIP
|
2740 |
|
|
* (which usually is TTY again).
|
2741 |
|
|
*/
|
2742 |
|
|
|
2743 |
|
|
static void strip_close(struct tty_struct *tty)
|
2744 |
|
|
{
|
2745 |
|
|
struct strip *strip_info = (struct strip *) tty->disc_data;
|
2746 |
|
|
|
2747 |
|
|
/*
|
2748 |
|
|
* First make sure we're connected.
|
2749 |
|
|
*/
|
2750 |
|
|
|
2751 |
|
|
if (!strip_info || strip_info->magic != STRIP_MAGIC)
|
2752 |
|
|
return;
|
2753 |
|
|
|
2754 |
|
|
unregister_netdev(&strip_info->dev);
|
2755 |
|
|
|
2756 |
|
|
tty->disc_data = 0;
|
2757 |
|
|
strip_info->tty = NULL;
|
2758 |
|
|
printk(KERN_INFO "STRIP: device \"%s\" closed down\n", strip_info->dev.name);
|
2759 |
|
|
strip_free(strip_info);
|
2760 |
|
|
tty->disc_data = NULL;
|
2761 |
|
|
MOD_DEC_USE_COUNT;
|
2762 |
|
|
}
|
2763 |
|
|
|
2764 |
|
|
|
2765 |
|
|
/************************************************************************/
|
2766 |
|
|
/* Perform I/O control calls on an active STRIP channel. */
|
2767 |
|
|
|
2768 |
|
|
static int strip_ioctl(struct tty_struct *tty, struct file *file,
|
2769 |
|
|
unsigned int cmd, unsigned long arg)
|
2770 |
|
|
{
|
2771 |
|
|
struct strip *strip_info = (struct strip *) tty->disc_data;
|
2772 |
|
|
|
2773 |
|
|
/*
|
2774 |
|
|
* First make sure we're connected.
|
2775 |
|
|
*/
|
2776 |
|
|
|
2777 |
|
|
if (!strip_info || strip_info->magic != STRIP_MAGIC)
|
2778 |
|
|
return -EINVAL;
|
2779 |
|
|
|
2780 |
|
|
switch(cmd)
|
2781 |
|
|
{
|
2782 |
|
|
case SIOCGIFNAME:
|
2783 |
|
|
return copy_to_user((void*)arg, strip_info->dev.name,
|
2784 |
|
|
strlen(strip_info->dev.name) + 1) ?
|
2785 |
|
|
-EFAULT : 0;
|
2786 |
|
|
break;
|
2787 |
|
|
case SIOCSIFHWADDR:
|
2788 |
|
|
{
|
2789 |
|
|
MetricomAddress addr;
|
2790 |
|
|
printk(KERN_INFO "%s: SIOCSIFHWADDR\n", strip_info->dev.name);
|
2791 |
|
|
return copy_from_user(&addr, (void*)arg, sizeof(MetricomAddress)) ?
|
2792 |
|
|
-EFAULT : set_mac_address(strip_info, &addr);
|
2793 |
|
|
break;
|
2794 |
|
|
}
|
2795 |
|
|
/*
|
2796 |
|
|
* Allow stty to read, but not set, the serial port
|
2797 |
|
|
*/
|
2798 |
|
|
|
2799 |
|
|
case TCGETS:
|
2800 |
|
|
case TCGETA:
|
2801 |
|
|
return n_tty_ioctl(tty, (struct file *) file, cmd,
|
2802 |
|
|
(unsigned long) arg);
|
2803 |
|
|
break;
|
2804 |
|
|
default:
|
2805 |
|
|
return -ENOIOCTLCMD;
|
2806 |
|
|
break;
|
2807 |
|
|
}
|
2808 |
|
|
}
|
2809 |
|
|
|
2810 |
|
|
|
2811 |
|
|
/************************************************************************/
|
2812 |
|
|
/* Initialization */
|
2813 |
|
|
|
2814 |
|
|
static struct tty_ldisc strip_ldisc = {
|
2815 |
|
|
magic: TTY_LDISC_MAGIC,
|
2816 |
|
|
name: "strip",
|
2817 |
|
|
open: strip_open,
|
2818 |
|
|
close: strip_close,
|
2819 |
|
|
ioctl: strip_ioctl,
|
2820 |
|
|
receive_buf: strip_receive_buf,
|
2821 |
|
|
receive_room: strip_receive_room,
|
2822 |
|
|
write_wakeup: strip_write_some_more,
|
2823 |
|
|
};
|
2824 |
|
|
|
2825 |
|
|
/*
|
2826 |
|
|
* Initialize the STRIP driver.
|
2827 |
|
|
* This routine is called at boot time, to bootstrap the multi-channel
|
2828 |
|
|
* STRIP driver
|
2829 |
|
|
*/
|
2830 |
|
|
|
2831 |
|
|
static char signon[] __initdata = KERN_INFO "STRIP: Version %s (unlimited channels)\n";
|
2832 |
|
|
|
2833 |
|
|
static int __init strip_init_driver(void)
|
2834 |
|
|
{
|
2835 |
|
|
int status;
|
2836 |
|
|
|
2837 |
|
|
printk(signon, StripVersion);
|
2838 |
|
|
|
2839 |
|
|
/*
|
2840 |
|
|
* Fill in our line protocol discipline, and register it
|
2841 |
|
|
*/
|
2842 |
|
|
if ((status = tty_register_ldisc(N_STRIP, &strip_ldisc)))
|
2843 |
|
|
printk(KERN_ERR "STRIP: can't register line discipline (err = %d)\n", status);
|
2844 |
|
|
|
2845 |
|
|
/*
|
2846 |
|
|
* Register the status file with /proc
|
2847 |
|
|
*/
|
2848 |
|
|
proc_net_create("strip", S_IFREG | S_IRUGO, get_status_info);
|
2849 |
|
|
|
2850 |
|
|
return status;
|
2851 |
|
|
}
|
2852 |
|
|
module_init(strip_init_driver);
|
2853 |
|
|
|
2854 |
|
|
static const char signoff[] __exitdata = KERN_INFO "STRIP: Module Unloaded\n";
|
2855 |
|
|
|
2856 |
|
|
static void __exit strip_exit_driver(void)
|
2857 |
|
|
{
|
2858 |
|
|
int i;
|
2859 |
|
|
while (struct_strip_list)
|
2860 |
|
|
strip_free(struct_strip_list);
|
2861 |
|
|
|
2862 |
|
|
/* Unregister with the /proc/net file here. */
|
2863 |
|
|
proc_net_remove("strip");
|
2864 |
|
|
|
2865 |
|
|
if ((i = tty_register_ldisc(N_STRIP, NULL)))
|
2866 |
|
|
printk(KERN_ERR "STRIP: can't unregister line discipline (err = %d)\n", i);
|
2867 |
|
|
|
2868 |
|
|
printk(signoff);
|
2869 |
|
|
}
|
2870 |
|
|
module_exit(strip_exit_driver);
|
2871 |
|
|
|
2872 |
|
|
MODULE_AUTHOR("Stuart Cheshire <cheshire@cs.stanford.edu>");
|
2873 |
|
|
MODULE_DESCRIPTION("Starmode Radio IP (STRIP) Device Driver");
|
2874 |
|
|
MODULE_LICENSE("Dual BSD/GPL");
|
2875 |
|
|
|
2876 |
|
|
MODULE_SUPPORTED_DEVICE("Starmode Radio IP (STRIP) modem");
|
2877 |
|
|
|