+++ /dev/null
-/*
- * Copyright 1996 The Board of Trustees of The Leland Stanford
- * Junior University. All Rights Reserved.
- *
- * Permission to use, copy, modify, and distribute this
- * software and its documentation for any purpose and without
- * fee is hereby granted, provided that the above copyright
- * notice appear in all copies. Stanford University
- * makes no representations about the suitability of this
- * software for any purpose. It is provided "as is" without
- * express or implied warranty.
- *
- * strip.c This module implements Starmode Radio IP (STRIP)
- * for kernel-based devices like TTY. It interfaces between a
- * raw TTY, and the kernel's INET protocol layers (via DDI).
- *
- * Version: @(#)strip.c 1.3 July 1997
- *
- * Author: Stuart Cheshire <cheshire@cs.stanford.edu>
- *
- * Fixes: v0.9 12th Feb 1996 (SC)
- * New byte stuffing (2+6 run-length encoding)
- * New watchdog timer task
- * New Protocol key (SIP0)
- *
- * v0.9.1 3rd March 1996 (SC)
- * Changed to dynamic device allocation -- no more compile
- * time (or boot time) limit on the number of STRIP devices.
- *
- * v0.9.2 13th March 1996 (SC)
- * Uses arp cache lookups (but doesn't send arp packets yet)
- *
- * v0.9.3 17th April 1996 (SC)
- * Fixed bug where STR_ERROR flag was getting set unneccessarily
- * (causing otherwise good packets to be unneccessarily dropped)
- *
- * v0.9.4 27th April 1996 (SC)
- * First attempt at using "&COMMAND" Starmode AT commands
- *
- * v0.9.5 29th May 1996 (SC)
- * First attempt at sending (unicast) ARP packets
- *
- * v0.9.6 5th June 1996 (Elliot)
- * Put "message level" tags in every "printk" statement
- *
- * v0.9.7 13th June 1996 (laik)
- * Added support for the /proc fs
- *
- * v0.9.8 July 1996 (Mema)
- * Added packet logging
- *
- * v1.0 November 1996 (SC)
- * Fixed (severe) memory leaks in the /proc fs code
- * Fixed race conditions in the logging code
- *
- * v1.1 January 1997 (SC)
- * Deleted packet logging (use tcpdump instead)
- * Added support for Metricom Firmware v204 features
- * (like message checksums)
- *
- * v1.2 January 1997 (SC)
- * Put portables list back in
- *
- * v1.3 July 1997 (SC)
- * Made STRIP driver set the radio's baud rate automatically.
- * It is no longer necessarily to manually set the radio's
- * rate permanently to 115200 -- the driver handles setting
- * the rate automatically.
- */
-
-#ifdef MODULE
-static const char StripVersion[] = "1.3A-STUART.CHESHIRE-MODULAR";
-#else
-static const char StripVersion[] = "1.3A-STUART.CHESHIRE";
-#endif
-
-#define TICKLE_TIMERS 0
-#define EXT_COUNTERS 1
-
-
-/************************************************************************/
-/* Header files */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/bitops.h>
-#include <asm/system.h>
-#include <asm/uaccess.h>
-
-# include <linux/ctype.h>
-#include <linux/string.h>
-#include <linux/mm.h>
-#include <linux/interrupt.h>
-#include <linux/in.h>
-#include <linux/tty.h>
-#include <linux/errno.h>
-#include <linux/netdevice.h>
-#include <linux/inetdevice.h>
-#include <linux/etherdevice.h>
-#include <linux/skbuff.h>
-#include <linux/if_arp.h>
-#include <linux/if_strip.h>
-#include <linux/proc_fs.h>
-#include <linux/seq_file.h>
-#include <linux/serial.h>
-#include <linux/serialP.h>
-#include <linux/rcupdate.h>
-#include <linux/compat.h>
-#include <linux/slab.h>
-#include <net/arp.h>
-#include <net/net_namespace.h>
-
-#include <linux/ip.h>
-#include <linux/tcp.h>
-#include <linux/time.h>
-#include <linux/jiffies.h>
-
-/************************************************************************/
-/* Useful structures and definitions */
-
-/*
- * A MetricomKey identifies the protocol being carried inside a Metricom
- * Starmode packet.
- */
-
-typedef union {
- __u8 c[4];
- __u32 l;
-} MetricomKey;
-
-/*
- * An IP address can be viewed as four bytes in memory (which is what it is) or as
- * a single 32-bit long (which is convenient for assignment, equality testing etc.)
- */
-
-typedef union {
- __u8 b[4];
- __u32 l;
-} IPaddr;
-
-/*
- * A MetricomAddressString is used to hold a printable representation of
- * a Metricom address.
- */
-
-typedef struct {
- __u8 c[24];
-} MetricomAddressString;
-
-/* Encapsulation can expand packet of size x to 65/64x + 1
- * Sent packet looks like "<CR>*<address>*<key><encaps payload><CR>"
- * 1 1 1-18 1 4 ? 1
- * eg. <CR>*0000-1234*SIP0<encaps payload><CR>
- * We allow 31 bytes for the stars, the key, the address and the <CR>s
- */
-#define STRIP_ENCAP_SIZE(X) (32 + (X)*65L/64L)
-
-/*
- * A STRIP_Header is never really sent over the radio, but making a dummy
- * header for internal use within the kernel that looks like an Ethernet
- * header makes certain other software happier. For example, tcpdump
- * already understands Ethernet headers.
- */
-
-typedef struct {
- MetricomAddress dst_addr; /* Destination address, e.g. "0000-1234" */
- MetricomAddress src_addr; /* Source address, e.g. "0000-5678" */
- unsigned short protocol; /* The protocol type, using Ethernet codes */
-} STRIP_Header;
-
-typedef struct {
- char c[60];
-} MetricomNode;
-
-#define NODE_TABLE_SIZE 32
-typedef struct {
- struct timeval timestamp;
- int num_nodes;
- MetricomNode node[NODE_TABLE_SIZE];
-} MetricomNodeTable;
-
-enum { FALSE = 0, TRUE = 1 };
-
-/*
- * Holds the radio's firmware version.
- */
-typedef struct {
- char c[50];
-} FirmwareVersion;
-
-/*
- * Holds the radio's serial number.
- */
-typedef struct {
- char c[18];
-} SerialNumber;
-
-/*
- * Holds the radio's battery voltage.
- */
-typedef struct {
- char c[11];
-} BatteryVoltage;
-
-typedef struct {
- char c[8];
-} char8;
-
-enum {
- NoStructure = 0, /* Really old firmware */
- StructuredMessages = 1, /* Parsable AT response msgs */
- ChecksummedMessages = 2 /* Parsable AT response msgs with checksums */
-};
-
-struct strip {
- int magic;
- /*
- * These are pointers to the malloc()ed frame buffers.
- */
-
- unsigned char *rx_buff; /* buffer for received IP packet */
- unsigned char *sx_buff; /* buffer for received serial data */
- int sx_count; /* received serial data counter */
- int sx_size; /* Serial buffer size */
- unsigned char *tx_buff; /* transmitter buffer */
- unsigned char *tx_head; /* pointer to next byte to XMIT */
- int tx_left; /* bytes left in XMIT queue */
- int tx_size; /* Serial buffer size */
-
- /*
- * STRIP interface statistics.
- */
-
- unsigned long rx_packets; /* inbound frames counter */
- unsigned long tx_packets; /* outbound frames counter */
- unsigned long rx_errors; /* Parity, etc. errors */
- unsigned long tx_errors; /* Planned stuff */
- unsigned long rx_dropped; /* No memory for skb */
- unsigned long tx_dropped; /* When MTU change */
- unsigned long rx_over_errors; /* Frame bigger than STRIP buf. */
-
- unsigned long pps_timer; /* Timer to determine pps */
- unsigned long rx_pps_count; /* Counter to determine pps */
- unsigned long tx_pps_count; /* Counter to determine pps */
- unsigned long sx_pps_count; /* Counter to determine pps */
- unsigned long rx_average_pps; /* rx packets per second * 8 */
- unsigned long tx_average_pps; /* tx packets per second * 8 */
- unsigned long sx_average_pps; /* sent packets per second * 8 */
-
-#ifdef EXT_COUNTERS
- unsigned long rx_bytes; /* total received bytes */
- unsigned long tx_bytes; /* total received bytes */
- unsigned long rx_rbytes; /* bytes thru radio i/f */
- unsigned long tx_rbytes; /* bytes thru radio i/f */
- unsigned long rx_sbytes; /* tot bytes thru serial i/f */
- unsigned long tx_sbytes; /* tot bytes thru serial i/f */
- unsigned long rx_ebytes; /* tot stat/err bytes */
- unsigned long tx_ebytes; /* tot stat/err bytes */
-#endif
-
- /*
- * Internal variables.
- */
-
- struct list_head list; /* Linked list of devices */
-
- int discard; /* Set if serial error */
- int working; /* Is radio working correctly? */
- int firmware_level; /* Message structuring level */
- int next_command; /* Next periodic command */
- unsigned int user_baud; /* The user-selected baud rate */
- int mtu; /* Our mtu (to spot changes!) */
- long watchdog_doprobe; /* Next time to test the radio */
- long watchdog_doreset; /* Time to do next reset */
- long gratuitous_arp; /* Time to send next ARP refresh */
- long arp_interval; /* Next ARP interval */
- struct timer_list idle_timer; /* For periodic wakeup calls */
- MetricomAddress true_dev_addr; /* True address of radio */
- int manual_dev_addr; /* Hack: See note below */
-
- FirmwareVersion firmware_version; /* The radio's firmware version */
- SerialNumber serial_number; /* The radio's serial number */
- BatteryVoltage battery_voltage; /* The radio's battery voltage */
-
- /*
- * Other useful structures.
- */
-
- struct tty_struct *tty; /* ptr to TTY structure */
- struct net_device *dev; /* Our device structure */
-
- /*
- * Neighbour radio records
- */
-
- MetricomNodeTable portables;
- MetricomNodeTable poletops;
-};
-
-/*
- * Note: manual_dev_addr hack
- *
- * It is not possible to change the hardware address of a Metricom radio,
- * or to send packets with a user-specified hardware source address, thus
- * trying to manually set a hardware source address is a questionable
- * thing to do. However, if the user *does* manually set the hardware
- * source address of a STRIP interface, then the kernel will believe it,
- * and use it in certain places. For example, the hardware address listed
- * by ifconfig will be the manual address, not the true one.
- * (Both addresses are listed in /proc/net/strip.)
- * Also, ARP packets will be sent out giving the user-specified address as
- * the source address, not the real address. This is dangerous, because
- * it means you won't receive any replies -- the ARP replies will go to
- * the specified address, which will be some other radio. The case where
- * this is useful is when that other radio is also connected to the same
- * machine. This allows you to connect a pair of radios to one machine,
- * and to use one exclusively for inbound traffic, and the other
- * exclusively for outbound traffic. Pretty neat, huh?
- *
- * Here's the full procedure to set this up:
- *
- * 1. "slattach" two interfaces, e.g. st0 for outgoing packets,
- * and st1 for incoming packets
- *
- * 2. "ifconfig" st0 (outbound radio) to have the hardware address
- * which is the real hardware address of st1 (inbound radio).
- * Now when it sends out packets, it will masquerade as st1, and
- * replies will be sent to that radio, which is exactly what we want.
- *
- * 3. Set the route table entry ("route add default ..." or
- * "route add -net ...", as appropriate) to send packets via the st0
- * interface (outbound radio). Do not add any route which sends packets
- * out via the st1 interface -- that radio is for inbound traffic only.
- *
- * 4. "ifconfig" st1 (inbound radio) to have hardware address zero.
- * This tells the STRIP driver to "shut down" that interface and not
- * send any packets through it. In particular, it stops sending the
- * periodic gratuitous ARP packets that a STRIP interface normally sends.
- * Also, when packets arrive on that interface, it will search the
- * interface list to see if there is another interface who's manual
- * hardware address matches its own real address (i.e. st0 in this
- * example) and if so it will transfer ownership of the skbuff to
- * that interface, so that it looks to the kernel as if the packet
- * arrived on that interface. This is necessary because when the
- * kernel sends an ARP packet on st0, it expects to get a reply on
- * st0, and if it sees the reply come from st1 then it will ignore
- * it (to be accurate, it puts the entry in the ARP table, but
- * labelled in such a way that st0 can't use it).
- *
- * Thanks to Petros Maniatis for coming up with the idea of splitting
- * inbound and outbound traffic between two interfaces, which turned
- * out to be really easy to implement, even if it is a bit of a hack.
- *
- * Having set a manual address on an interface, you can restore it
- * to automatic operation (where the address is automatically kept
- * consistent with the real address of the radio) by setting a manual
- * address of all ones, e.g. "ifconfig st0 hw strip FFFFFFFFFFFF"
- * This 'turns off' manual override mode for the device address.
- *
- * Note: The IEEE 802 headers reported in tcpdump will show the *real*
- * radio addresses the packets were sent and received from, so that you
- * can see what is really going on with packets, and which interfaces
- * they are really going through.
- */
-
-
-/************************************************************************/
-/* Constants */
-
-/*
- * CommandString1 works on all radios
- * Other CommandStrings are only used with firmware that provides structured responses.
- *
- * ats319=1 Enables Info message for node additions and deletions
- * ats319=2 Enables Info message for a new best node
- * ats319=4 Enables checksums
- * ats319=8 Enables ACK messages
- */
-
-static const int MaxCommandStringLength = 32;
-static const int CompatibilityCommand = 1;
-
-static const char CommandString0[] = "*&COMMAND*ATS319=7"; /* Turn on checksums & info messages */
-static const char CommandString1[] = "*&COMMAND*ATS305?"; /* Query radio name */
-static const char CommandString2[] = "*&COMMAND*ATS325?"; /* Query battery voltage */
-static const char CommandString3[] = "*&COMMAND*ATS300?"; /* Query version information */
-static const char CommandString4[] = "*&COMMAND*ATS311?"; /* Query poletop list */
-static const char CommandString5[] = "*&COMMAND*AT~LA"; /* Query portables list */
-typedef struct {
- const char *string;
- long length;
-} StringDescriptor;
-
-static const StringDescriptor CommandString[] = {
- {CommandString0, sizeof(CommandString0) - 1},
- {CommandString1, sizeof(CommandString1) - 1},
- {CommandString2, sizeof(CommandString2) - 1},
- {CommandString3, sizeof(CommandString3) - 1},
- {CommandString4, sizeof(CommandString4) - 1},
- {CommandString5, sizeof(CommandString5) - 1}
-};
-
-#define GOT_ALL_RADIO_INFO(S) \
- ((S)->firmware_version.c[0] && \
- (S)->battery_voltage.c[0] && \
- memcmp(&(S)->true_dev_addr, zero_address.c, sizeof(zero_address)))
-
-static const char hextable[16] = "0123456789ABCDEF";
-
-static const MetricomAddress zero_address;
-static const MetricomAddress broadcast_address =
- { {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF} };
-
-static const MetricomKey SIP0Key = { "SIP0" };
-static const MetricomKey ARP0Key = { "ARP0" };
-static const MetricomKey ATR_Key = { "ATR " };
-static const MetricomKey ACK_Key = { "ACK_" };
-static const MetricomKey INF_Key = { "INF_" };
-static const MetricomKey ERR_Key = { "ERR_" };
-
-static const long MaxARPInterval = 60 * HZ; /* One minute */
-
-/*
- * Maximum Starmode packet length is 1183 bytes. Allowing 4 bytes for
- * protocol key, 4 bytes for checksum, one byte for CR, and 65/64 expansion
- * for STRIP encoding, that translates to a maximum payload MTU of 1155.
- * Note: A standard NFS 1K data packet is a total of 0x480 (1152) bytes
- * long, including IP header, UDP header, and NFS header. Setting the STRIP
- * MTU to 1152 allows us to send default sized NFS packets without fragmentation.
- */
-static const unsigned short MAX_SEND_MTU = 1152;
-static const unsigned short MAX_RECV_MTU = 1500; /* Hoping for Ethernet sized packets in the future! */
-static const unsigned short DEFAULT_STRIP_MTU = 1152;
-static const int STRIP_MAGIC = 0x5303;
-static const long LongTime = 0x7FFFFFFF;
-
-/************************************************************************/
-/* Global variables */
-
-static LIST_HEAD(strip_list);
-static DEFINE_SPINLOCK(strip_lock);
-
-/************************************************************************/
-/* Macros */
-
-/* Returns TRUE if text T begins with prefix P */
-#define has_prefix(T,L,P) (((L) >= sizeof(P)-1) && !strncmp((T), (P), sizeof(P)-1))
-
-/* Returns TRUE if text T of length L is equal to string S */
-#define text_equal(T,L,S) (((L) == sizeof(S)-1) && !strncmp((T), (S), sizeof(S)-1))
-
-#define READHEX(X) ((X)>='0' && (X)<='9' ? (X)-'0' : \
- (X)>='a' && (X)<='f' ? (X)-'a'+10 : \
- (X)>='A' && (X)<='F' ? (X)-'A'+10 : 0 )
-
-#define READHEX16(X) ((__u16)(READHEX(X)))
-
-#define READDEC(X) ((X)>='0' && (X)<='9' ? (X)-'0' : 0)
-
-#define ARRAY_END(X) (&((X)[ARRAY_SIZE(X)]))
-
-#define JIFFIE_TO_SEC(X) ((X) / HZ)
-
-
-/************************************************************************/
-/* Utility routines */
-
-static int arp_query(unsigned char *haddr, u32 paddr,
- struct net_device *dev)
-{
- struct neighbour *neighbor_entry;
- int ret = 0;
-
- neighbor_entry = neigh_lookup(&arp_tbl, &paddr, dev);
-
- if (neighbor_entry != NULL) {
- neighbor_entry->used = jiffies;
- if (neighbor_entry->nud_state & NUD_VALID) {
- memcpy(haddr, neighbor_entry->ha, dev->addr_len);
- ret = 1;
- }
- neigh_release(neighbor_entry);
- }
- return ret;
-}
-
-static void DumpData(char *msg, struct strip *strip_info, __u8 * ptr,
- __u8 * end)
-{
- static const int MAX_DumpData = 80;
- __u8 pkt_text[MAX_DumpData], *p = pkt_text;
-
- *p++ = '\"';
-
- while (ptr < end && p < &pkt_text[MAX_DumpData - 4]) {
- if (*ptr == '\\') {
- *p++ = '\\';
- *p++ = '\\';
- } else {
- if (*ptr >= 32 && *ptr <= 126) {
- *p++ = *ptr;
- } else {
- sprintf(p, "\\%02X", *ptr);
- p += 3;
- }
- }
- ptr++;
- }
-
- if (ptr == end)
- *p++ = '\"';
- *p++ = 0;
-
- printk(KERN_INFO "%s: %-13s%s\n", strip_info->dev->name, msg, pkt_text);
-}
-
-
-/************************************************************************/
-/* Byte stuffing/unstuffing routines */
-
-/* Stuffing scheme:
- * 00 Unused (reserved character)
- * 01-3F Run of 2-64 different characters
- * 40-7F Run of 1-64 different characters plus a single zero at the end
- * 80-BF Run of 1-64 of the same character
- * C0-FF Run of 1-64 zeroes (ASCII 0)
- */
-
-typedef enum {
- Stuff_Diff = 0x00,
- Stuff_DiffZero = 0x40,
- Stuff_Same = 0x80,
- Stuff_Zero = 0xC0,
- Stuff_NoCode = 0xFF, /* Special code, meaning no code selected */
-
- Stuff_CodeMask = 0xC0,
- Stuff_CountMask = 0x3F,
- Stuff_MaxCount = 0x3F,
- Stuff_Magic = 0x0D /* The value we are eliminating */
-} StuffingCode;
-
-/* StuffData encodes the data starting at "src" for "length" bytes.
- * It writes it to the buffer pointed to by "dst" (which must be at least
- * as long as 1 + 65/64 of the input length). The output may be up to 1.6%
- * larger than the input for pathological input, but will usually be smaller.
- * StuffData returns the new value of the dst pointer as its result.
- * "code_ptr_ptr" points to a "__u8 *" which is used to hold encoding state
- * between calls, allowing an encoded packet to be incrementally built up
- * from small parts. On the first call, the "__u8 *" pointed to should be
- * initialized to NULL; between subsequent calls the calling routine should
- * leave the value alone and simply pass it back unchanged so that the
- * encoder can recover its current state.
- */
-
-#define StuffData_FinishBlock(X) \
-(*code_ptr = (X) ^ Stuff_Magic, code = Stuff_NoCode)
-
-static __u8 *StuffData(__u8 * src, __u32 length, __u8 * dst,
- __u8 ** code_ptr_ptr)
-{
- __u8 *end = src + length;
- __u8 *code_ptr = *code_ptr_ptr;
- __u8 code = Stuff_NoCode, count = 0;
-
- if (!length)
- return (dst);
-
- if (code_ptr) {
- /*
- * Recover state from last call, if applicable
- */
- code = (*code_ptr ^ Stuff_Magic) & Stuff_CodeMask;
- count = (*code_ptr ^ Stuff_Magic) & Stuff_CountMask;
- }
-
- while (src < end) {
- switch (code) {
- /* Stuff_NoCode: If no current code, select one */
- case Stuff_NoCode:
- /* Record where we're going to put this code */
- code_ptr = dst++;
- count = 0; /* Reset the count (zero means one instance) */
- /* Tentatively start a new block */
- if (*src == 0) {
- code = Stuff_Zero;
- src++;
- } else {
- code = Stuff_Same;
- *dst++ = *src++ ^ Stuff_Magic;
- }
- /* Note: We optimistically assume run of same -- */
- /* which will be fixed later in Stuff_Same */
- /* if it turns out not to be true. */
- break;
-
- /* Stuff_Zero: We already have at least one zero encoded */
- case Stuff_Zero:
- /* If another zero, count it, else finish this code block */
- if (*src == 0) {
- count++;
- src++;
- } else {
- StuffData_FinishBlock(Stuff_Zero + count);
- }
- break;
-
- /* Stuff_Same: We already have at least one byte encoded */
- case Stuff_Same:
- /* If another one the same, count it */
- if ((*src ^ Stuff_Magic) == code_ptr[1]) {
- count++;
- src++;
- break;
- }
- /* else, this byte does not match this block. */
- /* If we already have two or more bytes encoded, finish this code block */
- if (count) {
- StuffData_FinishBlock(Stuff_Same + count);
- break;
- }
- /* else, we only have one so far, so switch to Stuff_Diff code */
- code = Stuff_Diff;
- /* and fall through to Stuff_Diff case below
- * Note cunning cleverness here: case Stuff_Diff compares
- * the current character with the previous two to see if it
- * has a run of three the same. Won't this be an error if
- * there aren't two previous characters stored to compare with?
- * No. Because we know the current character is *not* the same
- * as the previous one, the first test below will necessarily
- * fail and the send half of the "if" won't be executed.
- */
-
- /* Stuff_Diff: We have at least two *different* bytes encoded */
- case Stuff_Diff:
- /* If this is a zero, must encode a Stuff_DiffZero, and begin a new block */
- if (*src == 0) {
- StuffData_FinishBlock(Stuff_DiffZero +
- count);
- }
- /* else, if we have three in a row, it is worth starting a Stuff_Same block */
- else if ((*src ^ Stuff_Magic) == dst[-1]
- && dst[-1] == dst[-2]) {
- /* Back off the last two characters we encoded */
- code += count - 2;
- /* Note: "Stuff_Diff + 0" is an illegal code */
- if (code == Stuff_Diff + 0) {
- code = Stuff_Same + 0;
- }
- StuffData_FinishBlock(code);
- code_ptr = dst - 2;
- /* dst[-1] already holds the correct value */
- count = 2; /* 2 means three bytes encoded */
- code = Stuff_Same;
- }
- /* else, another different byte, so add it to the block */
- else {
- *dst++ = *src ^ Stuff_Magic;
- count++;
- }
- src++; /* Consume the byte */
- break;
- }
- if (count == Stuff_MaxCount) {
- StuffData_FinishBlock(code + count);
- }
- }
- if (code == Stuff_NoCode) {
- *code_ptr_ptr = NULL;
- } else {
- *code_ptr_ptr = code_ptr;
- StuffData_FinishBlock(code + count);
- }
- return (dst);
-}
-
-/*
- * UnStuffData decodes the data at "src", up to (but not including) "end".
- * It writes the decoded data into the buffer pointed to by "dst", up to a
- * maximum of "dst_length", and returns the new value of "src" so that a
- * follow-on call can read more data, continuing from where the first left off.
- *
- * There are three types of results:
- * 1. The source data runs out before extracting "dst_length" bytes:
- * UnStuffData returns NULL to indicate failure.
- * 2. The source data produces exactly "dst_length" bytes:
- * UnStuffData returns new_src = end to indicate that all bytes were consumed.
- * 3. "dst_length" bytes are extracted, with more remaining.
- * UnStuffData returns new_src < end to indicate that there are more bytes
- * to be read.
- *
- * Note: The decoding may be destructive, in that it may alter the source
- * data in the process of decoding it (this is necessary to allow a follow-on
- * call to resume correctly).
- */
-
-static __u8 *UnStuffData(__u8 * src, __u8 * end, __u8 * dst,
- __u32 dst_length)
-{
- __u8 *dst_end = dst + dst_length;
- /* Sanity check */
- if (!src || !end || !dst || !dst_length)
- return (NULL);
- while (src < end && dst < dst_end) {
- int count = (*src ^ Stuff_Magic) & Stuff_CountMask;
- switch ((*src ^ Stuff_Magic) & Stuff_CodeMask) {
- case Stuff_Diff:
- if (src + 1 + count >= end)
- return (NULL);
- do {
- *dst++ = *++src ^ Stuff_Magic;
- }
- while (--count >= 0 && dst < dst_end);
- if (count < 0)
- src += 1;
- else {
- if (count == 0)
- *src = Stuff_Same ^ Stuff_Magic;
- else
- *src =
- (Stuff_Diff +
- count) ^ Stuff_Magic;
- }
- break;
- case Stuff_DiffZero:
- if (src + 1 + count >= end)
- return (NULL);
- do {
- *dst++ = *++src ^ Stuff_Magic;
- }
- while (--count >= 0 && dst < dst_end);
- if (count < 0)
- *src = Stuff_Zero ^ Stuff_Magic;
- else
- *src =
- (Stuff_DiffZero + count) ^ Stuff_Magic;
- break;
- case Stuff_Same:
- if (src + 1 >= end)
- return (NULL);
- do {
- *dst++ = src[1] ^ Stuff_Magic;
- }
- while (--count >= 0 && dst < dst_end);
- if (count < 0)
- src += 2;
- else
- *src = (Stuff_Same + count) ^ Stuff_Magic;
- break;
- case Stuff_Zero:
- do {
- *dst++ = 0;
- }
- while (--count >= 0 && dst < dst_end);
- if (count < 0)
- src += 1;
- else
- *src = (Stuff_Zero + count) ^ Stuff_Magic;
- break;
- }
- }
- if (dst < dst_end)
- return (NULL);
- else
- return (src);
-}
-
-
-/************************************************************************/
-/* General routines for STRIP */
-
-/*
- * set_baud sets the baud rate to the rate defined by baudcode
- */
-static void set_baud(struct tty_struct *tty, speed_t baudrate)
-{
- struct ktermios old_termios;
-
- mutex_lock(&tty->termios_mutex);
- old_termios =*(tty->termios);
- tty_encode_baud_rate(tty, baudrate, baudrate);
- tty->ops->set_termios(tty, &old_termios);
- mutex_unlock(&tty->termios_mutex);
-}
-
-/*
- * Convert a string to a Metricom Address.
- */
-
-#define IS_RADIO_ADDRESS(p) ( \
- isdigit((p)[0]) && isdigit((p)[1]) && isdigit((p)[2]) && isdigit((p)[3]) && \
- (p)[4] == '-' && \
- isdigit((p)[5]) && isdigit((p)[6]) && isdigit((p)[7]) && isdigit((p)[8]) )
-
-static int string_to_radio_address(MetricomAddress * addr, __u8 * p)
-{
- if (!IS_RADIO_ADDRESS(p))
- return (1);
- addr->c[0] = 0;
- addr->c[1] = 0;
- addr->c[2] = READHEX(p[0]) << 4 | READHEX(p[1]);
- addr->c[3] = READHEX(p[2]) << 4 | READHEX(p[3]);
- addr->c[4] = READHEX(p[5]) << 4 | READHEX(p[6]);
- addr->c[5] = READHEX(p[7]) << 4 | READHEX(p[8]);
- return (0);
-}
-
-/*
- * Convert a Metricom Address to a string.
- */
-
-static __u8 *radio_address_to_string(const MetricomAddress * addr,
- MetricomAddressString * p)
-{
- sprintf(p->c, "%02X%02X-%02X%02X", addr->c[2], addr->c[3],
- addr->c[4], addr->c[5]);
- return (p->c);
-}
-
-/*
- * Note: Must make sure sx_size is big enough to receive a stuffed
- * MAX_RECV_MTU packet. Additionally, we also want to ensure that it's
- * big enough to receive a large radio neighbour list (currently 4K).
- */
-
-static int allocate_buffers(struct strip *strip_info, int mtu)
-{
- struct net_device *dev = strip_info->dev;
- int sx_size = max_t(int, STRIP_ENCAP_SIZE(MAX_RECV_MTU), 4096);
- int tx_size = STRIP_ENCAP_SIZE(mtu) + MaxCommandStringLength;
- __u8 *r = kmalloc(MAX_RECV_MTU, GFP_ATOMIC);
- __u8 *s = kmalloc(sx_size, GFP_ATOMIC);
- __u8 *t = kmalloc(tx_size, GFP_ATOMIC);
- if (r && s && t) {
- strip_info->rx_buff = r;
- strip_info->sx_buff = s;
- strip_info->tx_buff = t;
- strip_info->sx_size = sx_size;
- strip_info->tx_size = tx_size;
- strip_info->mtu = dev->mtu = mtu;
- return (1);
- }
- kfree(r);
- kfree(s);
- kfree(t);
- return (0);
-}
-
-/*
- * MTU has been changed by the IP layer.
- * We could be in
- * an upcall from the tty driver, or in an ip packet queue.
- */
-static int strip_change_mtu(struct net_device *dev, int new_mtu)
-{
- struct strip *strip_info = netdev_priv(dev);
- int old_mtu = strip_info->mtu;
- unsigned char *orbuff = strip_info->rx_buff;
- unsigned char *osbuff = strip_info->sx_buff;
- unsigned char *otbuff = strip_info->tx_buff;
-
- if (new_mtu > MAX_SEND_MTU) {
- printk(KERN_ERR
- "%s: MTU exceeds maximum allowable (%d), MTU change cancelled.\n",
- strip_info->dev->name, MAX_SEND_MTU);
- return -EINVAL;
- }
-
- spin_lock_bh(&strip_lock);
- if (!allocate_buffers(strip_info, new_mtu)) {
- printk(KERN_ERR "%s: unable to grow strip buffers, MTU change cancelled.\n",
- strip_info->dev->name);
- spin_unlock_bh(&strip_lock);
- return -ENOMEM;
- }
-
- if (strip_info->sx_count) {
- if (strip_info->sx_count <= strip_info->sx_size)
- memcpy(strip_info->sx_buff, osbuff,
- strip_info->sx_count);
- else {
- strip_info->discard = strip_info->sx_count;
- strip_info->rx_over_errors++;
- }
- }
-
- if (strip_info->tx_left) {
- if (strip_info->tx_left <= strip_info->tx_size)
- memcpy(strip_info->tx_buff, strip_info->tx_head,
- strip_info->tx_left);
- else {
- strip_info->tx_left = 0;
- strip_info->tx_dropped++;
- }
- }
- strip_info->tx_head = strip_info->tx_buff;
- spin_unlock_bh(&strip_lock);
-
- printk(KERN_NOTICE "%s: strip MTU changed fom %d to %d.\n",
- strip_info->dev->name, old_mtu, strip_info->mtu);
-
- kfree(orbuff);
- kfree(osbuff);
- kfree(otbuff);
- return 0;
-}
-
-static void strip_unlock(struct strip *strip_info)
-{
- /*
- * Set the timer to go off in one second.
- */
- strip_info->idle_timer.expires = jiffies + 1 * HZ;
- add_timer(&strip_info->idle_timer);
- netif_wake_queue(strip_info->dev);
-}
-
-
-
-/*
- * If the time is in the near future, time_delta prints the number of
- * seconds to go into the buffer and returns the address of the buffer.
- * If the time is not in the near future, it returns the address of the
- * string "Not scheduled" The buffer must be long enough to contain the
- * ascii representation of the number plus 9 charactes for the " seconds"
- * and the null character.
- */
-#ifdef CONFIG_PROC_FS
-static char *time_delta(char buffer[], long time)
-{
- time -= jiffies;
- if (time > LongTime / 2)
- return ("Not scheduled");
- if (time < 0)
- time = 0; /* Don't print negative times */
- sprintf(buffer, "%ld seconds", time / HZ);
- return (buffer);
-}
-
-/* get Nth element of the linked list */
-static struct strip *strip_get_idx(loff_t pos)
-{
- struct strip *str;
- int i = 0;
-
- list_for_each_entry_rcu(str, &strip_list, list) {
- if (pos == i)
- return str;
- ++i;
- }
- return NULL;
-}
-
-static void *strip_seq_start(struct seq_file *seq, loff_t *pos)
- __acquires(RCU)
-{
- rcu_read_lock();
- return *pos ? strip_get_idx(*pos - 1) : SEQ_START_TOKEN;
-}
-
-static void *strip_seq_next(struct seq_file *seq, void *v, loff_t *pos)
-{
- struct list_head *l;
- struct strip *s;
-
- ++*pos;
- if (v == SEQ_START_TOKEN)
- return strip_get_idx(1);
-
- s = v;
- l = &s->list;
- list_for_each_continue_rcu(l, &strip_list) {
- return list_entry(l, struct strip, list);
- }
- return NULL;
-}
-
-static void strip_seq_stop(struct seq_file *seq, void *v)
- __releases(RCU)
-{
- rcu_read_unlock();
-}
-
-static void strip_seq_neighbours(struct seq_file *seq,
- const MetricomNodeTable * table,
- const char *title)
-{
- /* We wrap this in a do/while loop, so if the table changes */
- /* while we're reading it, we just go around and try again. */
- struct timeval t;
-
- do {
- int i;
- t = table->timestamp;
- if (table->num_nodes)
- seq_printf(seq, "\n %s\n", title);
- for (i = 0; i < table->num_nodes; i++) {
- MetricomNode node;
-
- spin_lock_bh(&strip_lock);
- node = table->node[i];
- spin_unlock_bh(&strip_lock);
- seq_printf(seq, " %s\n", node.c);
- }
- } while (table->timestamp.tv_sec != t.tv_sec
- || table->timestamp.tv_usec != t.tv_usec);
-}
-
-/*
- * This function prints radio status information via the seq_file
- * interface. The interface takes care of buffer size and over
- * run issues.
- *
- * The buffer in seq_file is PAGESIZE (4K)
- * so this routine should never print more or it will get truncated.
- * With the maximum of 32 portables and 32 poletops
- * reported, the routine outputs 3107 bytes into the buffer.
- */
-static void strip_seq_status_info(struct seq_file *seq,
- const struct strip *strip_info)
-{
- char temp[32];
- MetricomAddressString addr_string;
-
- /* First, we must copy all of our data to a safe place, */
- /* in case a serial interrupt comes in and changes it. */
- int tx_left = strip_info->tx_left;
- unsigned long rx_average_pps = strip_info->rx_average_pps;
- unsigned long tx_average_pps = strip_info->tx_average_pps;
- unsigned long sx_average_pps = strip_info->sx_average_pps;
- int working = strip_info->working;
- int firmware_level = strip_info->firmware_level;
- long watchdog_doprobe = strip_info->watchdog_doprobe;
- long watchdog_doreset = strip_info->watchdog_doreset;
- long gratuitous_arp = strip_info->gratuitous_arp;
- long arp_interval = strip_info->arp_interval;
- FirmwareVersion firmware_version = strip_info->firmware_version;
- SerialNumber serial_number = strip_info->serial_number;
- BatteryVoltage battery_voltage = strip_info->battery_voltage;
- char *if_name = strip_info->dev->name;
- MetricomAddress true_dev_addr = strip_info->true_dev_addr;
- MetricomAddress dev_dev_addr =
- *(MetricomAddress *) strip_info->dev->dev_addr;
- int manual_dev_addr = strip_info->manual_dev_addr;
-#ifdef EXT_COUNTERS
- unsigned long rx_bytes = strip_info->rx_bytes;
- unsigned long tx_bytes = strip_info->tx_bytes;
- unsigned long rx_rbytes = strip_info->rx_rbytes;
- unsigned long tx_rbytes = strip_info->tx_rbytes;
- unsigned long rx_sbytes = strip_info->rx_sbytes;
- unsigned long tx_sbytes = strip_info->tx_sbytes;
- unsigned long rx_ebytes = strip_info->rx_ebytes;
- unsigned long tx_ebytes = strip_info->tx_ebytes;
-#endif
-
- seq_printf(seq, "\nInterface name\t\t%s\n", if_name);
- seq_printf(seq, " Radio working:\t\t%s\n", working ? "Yes" : "No");
- radio_address_to_string(&true_dev_addr, &addr_string);
- seq_printf(seq, " Radio address:\t\t%s\n", addr_string.c);
- if (manual_dev_addr) {
- radio_address_to_string(&dev_dev_addr, &addr_string);
- seq_printf(seq, " Device address:\t%s\n", addr_string.c);
- }
- seq_printf(seq, " Firmware version:\t%s", !working ? "Unknown" :
- !firmware_level ? "Should be upgraded" :
- firmware_version.c);
- if (firmware_level >= ChecksummedMessages)
- seq_printf(seq, " (Checksums Enabled)");
- seq_printf(seq, "\n");
- seq_printf(seq, " Serial number:\t\t%s\n", serial_number.c);
- seq_printf(seq, " Battery voltage:\t%s\n", battery_voltage.c);
- seq_printf(seq, " Transmit queue (bytes):%d\n", tx_left);
- seq_printf(seq, " Receive packet rate: %ld packets per second\n",
- rx_average_pps / 8);
- seq_printf(seq, " Transmit packet rate: %ld packets per second\n",
- tx_average_pps / 8);
- seq_printf(seq, " Sent packet rate: %ld packets per second\n",
- sx_average_pps / 8);
- seq_printf(seq, " Next watchdog probe:\t%s\n",
- time_delta(temp, watchdog_doprobe));
- seq_printf(seq, " Next watchdog reset:\t%s\n",
- time_delta(temp, watchdog_doreset));
- seq_printf(seq, " Next gratuitous ARP:\t");
-
- if (!memcmp
- (strip_info->dev->dev_addr, zero_address.c,
- sizeof(zero_address)))
- seq_printf(seq, "Disabled\n");
- else {
- seq_printf(seq, "%s\n", time_delta(temp, gratuitous_arp));
- seq_printf(seq, " Next ARP interval:\t%ld seconds\n",
- JIFFIE_TO_SEC(arp_interval));
- }
-
- if (working) {
-#ifdef EXT_COUNTERS
- seq_printf(seq, "\n");
- seq_printf(seq,
- " Total bytes: \trx:\t%lu\ttx:\t%lu\n",
- rx_bytes, tx_bytes);
- seq_printf(seq,
- " thru radio: \trx:\t%lu\ttx:\t%lu\n",
- rx_rbytes, tx_rbytes);
- seq_printf(seq,
- " thru serial port: \trx:\t%lu\ttx:\t%lu\n",
- rx_sbytes, tx_sbytes);
- seq_printf(seq,
- " Total stat/err bytes:\trx:\t%lu\ttx:\t%lu\n",
- rx_ebytes, tx_ebytes);
-#endif
- strip_seq_neighbours(seq, &strip_info->poletops,
- "Poletops:");
- strip_seq_neighbours(seq, &strip_info->portables,
- "Portables:");
- }
-}
-
-/*
- * This function is exports status information from the STRIP driver through
- * the /proc file system.
- */
-static int strip_seq_show(struct seq_file *seq, void *v)
-{
- if (v == SEQ_START_TOKEN)
- seq_printf(seq, "strip_version: %s\n", StripVersion);
- else
- strip_seq_status_info(seq, (const struct strip *)v);
- return 0;
-}
-
-
-static const struct seq_operations strip_seq_ops = {
- .start = strip_seq_start,
- .next = strip_seq_next,
- .stop = strip_seq_stop,
- .show = strip_seq_show,
-};
-
-static int strip_seq_open(struct inode *inode, struct file *file)
-{
- return seq_open(file, &strip_seq_ops);
-}
-
-static const struct file_operations strip_seq_fops = {
- .owner = THIS_MODULE,
- .open = strip_seq_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = seq_release,
-};
-#endif
-
-
-
-/************************************************************************/
-/* Sending routines */
-
-static void ResetRadio(struct strip *strip_info)
-{
- struct tty_struct *tty = strip_info->tty;
- static const char init[] = "ate0q1dt**starmode\r**";
- StringDescriptor s = { init, sizeof(init) - 1 };
-
- /*
- * If the radio isn't working anymore,
- * we should clear the old status information.
- */
- if (strip_info->working) {
- printk(KERN_INFO "%s: No response: Resetting radio.\n",
- strip_info->dev->name);
- strip_info->firmware_version.c[0] = '\0';
- strip_info->serial_number.c[0] = '\0';
- strip_info->battery_voltage.c[0] = '\0';
- strip_info->portables.num_nodes = 0;
- do_gettimeofday(&strip_info->portables.timestamp);
- strip_info->poletops.num_nodes = 0;
- do_gettimeofday(&strip_info->poletops.timestamp);
- }
-
- strip_info->pps_timer = jiffies;
- strip_info->rx_pps_count = 0;
- strip_info->tx_pps_count = 0;
- strip_info->sx_pps_count = 0;
- strip_info->rx_average_pps = 0;
- strip_info->tx_average_pps = 0;
- strip_info->sx_average_pps = 0;
-
- /* Mark radio address as unknown */
- *(MetricomAddress *) & strip_info->true_dev_addr = zero_address;
- if (!strip_info->manual_dev_addr)
- *(MetricomAddress *) strip_info->dev->dev_addr =
- zero_address;
- strip_info->working = FALSE;
- strip_info->firmware_level = NoStructure;
- strip_info->next_command = CompatibilityCommand;
- strip_info->watchdog_doprobe = jiffies + 10 * HZ;
- strip_info->watchdog_doreset = jiffies + 1 * HZ;
-
- /* If the user has selected a baud rate above 38.4 see what magic we have to do */
- if (strip_info->user_baud > 38400) {
- /*
- * Subtle stuff: Pay attention :-)
- * If the serial port is currently at the user's selected (>38.4) rate,
- * then we temporarily switch to 19.2 and issue the ATS304 command
- * to tell the radio to switch to the user's selected rate.
- * If the serial port is not currently at that rate, that means we just
- * issued the ATS304 command last time through, so this time we restore
- * the user's selected rate and issue the normal starmode reset string.
- */
- if (strip_info->user_baud == tty_get_baud_rate(tty)) {
- static const char b0[] = "ate0q1s304=57600\r";
- static const char b1[] = "ate0q1s304=115200\r";
- static const StringDescriptor baudstring[2] =
- { {b0, sizeof(b0) - 1}
- , {b1, sizeof(b1) - 1}
- };
- set_baud(tty, 19200);
- if (strip_info->user_baud == 57600)
- s = baudstring[0];
- else if (strip_info->user_baud == 115200)
- s = baudstring[1];
- else
- s = baudstring[1]; /* For now */
- } else
- set_baud(tty, strip_info->user_baud);
- }
-
- tty->ops->write(tty, s.string, s.length);
-#ifdef EXT_COUNTERS
- strip_info->tx_ebytes += s.length;
-#endif
-}
-
-/*
- * Called by the driver when there's room for more data. If we have
- * more packets to send, we send them here.
- */
-
-static void strip_write_some_more(struct tty_struct *tty)
-{
- struct strip *strip_info = tty->disc_data;
-
- /* First make sure we're connected. */
- if (!strip_info || strip_info->magic != STRIP_MAGIC ||
- !netif_running(strip_info->dev))
- return;
-
- if (strip_info->tx_left > 0) {
- int num_written =
- tty->ops->write(tty, strip_info->tx_head,
- strip_info->tx_left);
- strip_info->tx_left -= num_written;
- strip_info->tx_head += num_written;
-#ifdef EXT_COUNTERS
- strip_info->tx_sbytes += num_written;
-#endif
- } else { /* Else start transmission of another packet */
-
- clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
- strip_unlock(strip_info);
- }
-}
-
-static __u8 *add_checksum(__u8 * buffer, __u8 * end)
-{
- __u16 sum = 0;
- __u8 *p = buffer;
- while (p < end)
- sum += *p++;
- end[3] = hextable[sum & 0xF];
- sum >>= 4;
- end[2] = hextable[sum & 0xF];
- sum >>= 4;
- end[1] = hextable[sum & 0xF];
- sum >>= 4;
- end[0] = hextable[sum & 0xF];
- return (end + 4);
-}
-
-static unsigned char *strip_make_packet(unsigned char *buffer,
- struct strip *strip_info,
- struct sk_buff *skb)
-{
- __u8 *ptr = buffer;
- __u8 *stuffstate = NULL;
- STRIP_Header *header = (STRIP_Header *) skb->data;
- MetricomAddress haddr = header->dst_addr;
- int len = skb->len - sizeof(STRIP_Header);
- MetricomKey key;
-
- /*HexDump("strip_make_packet", strip_info, skb->data, skb->data + skb->len); */
-
- if (header->protocol == htons(ETH_P_IP))
- key = SIP0Key;
- else if (header->protocol == htons(ETH_P_ARP))
- key = ARP0Key;
- else {
- printk(KERN_ERR
- "%s: strip_make_packet: Unknown packet type 0x%04X\n",
- strip_info->dev->name, ntohs(header->protocol));
- return (NULL);
- }
-
- if (len > strip_info->mtu) {
- printk(KERN_ERR
- "%s: Dropping oversized transmit packet: %d bytes\n",
- strip_info->dev->name, len);
- return (NULL);
- }
-
- /*
- * If we're sending to ourselves, discard the packet.
- * (Metricom radios choke if they try to send a packet to their own address.)
- */
- if (!memcmp(haddr.c, strip_info->true_dev_addr.c, sizeof(haddr))) {
- printk(KERN_ERR "%s: Dropping packet addressed to self\n",
- strip_info->dev->name);
- return (NULL);
- }
-
- /*
- * If this is a broadcast packet, send it to our designated Metricom
- * 'broadcast hub' radio (First byte of address being 0xFF means broadcast)
- */
- if (haddr.c[0] == 0xFF) {
- __be32 brd = 0;
- struct in_device *in_dev;
-
- rcu_read_lock();
- in_dev = __in_dev_get_rcu(strip_info->dev);
- if (in_dev == NULL) {
- rcu_read_unlock();
- return NULL;
- }
- if (in_dev->ifa_list)
- brd = in_dev->ifa_list->ifa_broadcast;
- rcu_read_unlock();
-
- /* arp_query returns 1 if it succeeds in looking up the address, 0 if it fails */
- if (!arp_query(haddr.c, brd, strip_info->dev)) {
- printk(KERN_ERR
- "%s: Unable to send packet (no broadcast hub configured)\n",
- strip_info->dev->name);
- return (NULL);
- }
- /*
- * If we are the broadcast hub, don't bother sending to ourselves.
- * (Metricom radios choke if they try to send a packet to their own address.)
- */
- if (!memcmp
- (haddr.c, strip_info->true_dev_addr.c, sizeof(haddr)))
- return (NULL);
- }
-
- *ptr++ = 0x0D;
- *ptr++ = '*';
- *ptr++ = hextable[haddr.c[2] >> 4];
- *ptr++ = hextable[haddr.c[2] & 0xF];
- *ptr++ = hextable[haddr.c[3] >> 4];
- *ptr++ = hextable[haddr.c[3] & 0xF];
- *ptr++ = '-';
- *ptr++ = hextable[haddr.c[4] >> 4];
- *ptr++ = hextable[haddr.c[4] & 0xF];
- *ptr++ = hextable[haddr.c[5] >> 4];
- *ptr++ = hextable[haddr.c[5] & 0xF];
- *ptr++ = '*';
- *ptr++ = key.c[0];
- *ptr++ = key.c[1];
- *ptr++ = key.c[2];
- *ptr++ = key.c[3];
-
- ptr =
- StuffData(skb->data + sizeof(STRIP_Header), len, ptr,
- &stuffstate);
-
- if (strip_info->firmware_level >= ChecksummedMessages)
- ptr = add_checksum(buffer + 1, ptr);
-
- *ptr++ = 0x0D;
- return (ptr);
-}
-
-static void strip_send(struct strip *strip_info, struct sk_buff *skb)
-{
- MetricomAddress haddr;
- unsigned char *ptr = strip_info->tx_buff;
- int doreset = (long) jiffies - strip_info->watchdog_doreset >= 0;
- int doprobe = (long) jiffies - strip_info->watchdog_doprobe >= 0
- && !doreset;
- __be32 addr, brd;
-
- /*
- * 1. If we have a packet, encapsulate it and put it in the buffer
- */
- if (skb) {
- char *newptr = strip_make_packet(ptr, strip_info, skb);
- strip_info->tx_pps_count++;
- if (!newptr)
- strip_info->tx_dropped++;
- else {
- ptr = newptr;
- strip_info->sx_pps_count++;
- strip_info->tx_packets++; /* Count another successful packet */
-#ifdef EXT_COUNTERS
- strip_info->tx_bytes += skb->len;
- strip_info->tx_rbytes += ptr - strip_info->tx_buff;
-#endif
- /*DumpData("Sending:", strip_info, strip_info->tx_buff, ptr); */
- /*HexDump("Sending", strip_info, strip_info->tx_buff, ptr); */
- }
- }
-
- /*
- * 2. If it is time for another tickle, tack it on, after the packet
- */
- if (doprobe) {
- StringDescriptor ts = CommandString[strip_info->next_command];
-#if TICKLE_TIMERS
- {
- struct timeval tv;
- do_gettimeofday(&tv);
- printk(KERN_INFO "**** Sending tickle string %d at %02d.%06d\n",
- strip_info->next_command, tv.tv_sec % 100,
- tv.tv_usec);
- }
-#endif
- if (ptr == strip_info->tx_buff)
- *ptr++ = 0x0D;
-
- *ptr++ = '*'; /* First send "**" to provoke an error message */
- *ptr++ = '*';
-
- /* Then add the command */
- memcpy(ptr, ts.string, ts.length);
-
- /* Add a checksum ? */
- if (strip_info->firmware_level < ChecksummedMessages)
- ptr += ts.length;
- else
- ptr = add_checksum(ptr, ptr + ts.length);
-
- *ptr++ = 0x0D; /* Terminate the command with a <CR> */
-
- /* Cycle to next periodic command? */
- if (strip_info->firmware_level >= StructuredMessages)
- if (++strip_info->next_command >=
- ARRAY_SIZE(CommandString))
- strip_info->next_command = 0;
-#ifdef EXT_COUNTERS
- strip_info->tx_ebytes += ts.length;
-#endif
- strip_info->watchdog_doprobe = jiffies + 10 * HZ;
- strip_info->watchdog_doreset = jiffies + 1 * HZ;
- /*printk(KERN_INFO "%s: Routine radio test.\n", strip_info->dev->name); */
- }
-
- /*
- * 3. Set up the strip_info ready to send the data (if any).
- */
- strip_info->tx_head = strip_info->tx_buff;
- strip_info->tx_left = ptr - strip_info->tx_buff;
- set_bit(TTY_DO_WRITE_WAKEUP, &strip_info->tty->flags);
- /*
- * 4. Debugging check to make sure we're not overflowing the buffer.
- */
- if (strip_info->tx_size - strip_info->tx_left < 20)
- printk(KERN_ERR "%s: Sending%5d bytes;%5d bytes free.\n",
- strip_info->dev->name, strip_info->tx_left,
- strip_info->tx_size - strip_info->tx_left);
-
- /*
- * 5. If watchdog has expired, reset the radio. Note: if there's data waiting in
- * the buffer, strip_write_some_more will send it after the reset has finished
- */
- if (doreset) {
- ResetRadio(strip_info);
- return;
- }
-
- if (1) {
- struct in_device *in_dev;
-
- brd = addr = 0;
- rcu_read_lock();
- in_dev = __in_dev_get_rcu(strip_info->dev);
- if (in_dev) {
- if (in_dev->ifa_list) {
- brd = in_dev->ifa_list->ifa_broadcast;
- addr = in_dev->ifa_list->ifa_local;
- }
- }
- rcu_read_unlock();
- }
-
-
- /*
- * 6. If it is time for a periodic ARP, queue one up to be sent.
- * We only do this if:
- * 1. The radio is working
- * 2. It's time to send another periodic ARP
- * 3. We really know what our address is (and it is not manually set to zero)
- * 4. We have a designated broadcast address configured
- * If we queue up an ARP packet when we don't have a designated broadcast
- * address configured, then the packet will just have to be discarded in
- * strip_make_packet. This is not fatal, but it causes misleading information
- * to be displayed in tcpdump. tcpdump will report that periodic APRs are
- * being sent, when in fact they are not, because they are all being dropped
- * in the strip_make_packet routine.
- */
- if (strip_info->working
- && (long) jiffies - strip_info->gratuitous_arp >= 0
- && memcmp(strip_info->dev->dev_addr, zero_address.c,
- sizeof(zero_address))
- && arp_query(haddr.c, brd, strip_info->dev)) {
- /*printk(KERN_INFO "%s: Sending gratuitous ARP with interval %ld\n",
- strip_info->dev->name, strip_info->arp_interval / HZ); */
- strip_info->gratuitous_arp =
- jiffies + strip_info->arp_interval;
- strip_info->arp_interval *= 2;
- if (strip_info->arp_interval > MaxARPInterval)
- strip_info->arp_interval = MaxARPInterval;
- if (addr)
- arp_send(ARPOP_REPLY, ETH_P_ARP, addr, /* Target address of ARP packet is our address */
- strip_info->dev, /* Device to send packet on */
- addr, /* Source IP address this ARP packet comes from */
- NULL, /* Destination HW address is NULL (broadcast it) */
- strip_info->dev->dev_addr, /* Source HW address is our HW address */
- strip_info->dev->dev_addr); /* Target HW address is our HW address (redundant) */
- }
-
- /*
- * 7. All ready. Start the transmission
- */
- strip_write_some_more(strip_info->tty);
-}
-
-/* Encapsulate a datagram and kick it into a TTY queue. */
-static netdev_tx_t strip_xmit(struct sk_buff *skb, struct net_device *dev)
-{
- struct strip *strip_info = netdev_priv(dev);
-
- if (!netif_running(dev)) {
- printk(KERN_ERR "%s: xmit call when iface is down\n",
- dev->name);
- return NETDEV_TX_BUSY;
- }
-
- netif_stop_queue(dev);
-
- del_timer(&strip_info->idle_timer);
-
-
- if (time_after(jiffies, strip_info->pps_timer + HZ)) {
- unsigned long t = jiffies - strip_info->pps_timer;
- unsigned long rx_pps_count =
- DIV_ROUND_CLOSEST(strip_info->rx_pps_count*HZ*8, t);
- unsigned long tx_pps_count =
- DIV_ROUND_CLOSEST(strip_info->tx_pps_count*HZ*8, t);
- unsigned long sx_pps_count =
- DIV_ROUND_CLOSEST(strip_info->sx_pps_count*HZ*8, t);
-
- strip_info->pps_timer = jiffies;
- strip_info->rx_pps_count = 0;
- strip_info->tx_pps_count = 0;
- strip_info->sx_pps_count = 0;
-
- strip_info->rx_average_pps = (strip_info->rx_average_pps + rx_pps_count + 1) / 2;
- strip_info->tx_average_pps = (strip_info->tx_average_pps + tx_pps_count + 1) / 2;
- strip_info->sx_average_pps = (strip_info->sx_average_pps + sx_pps_count + 1) / 2;
-
- if (rx_pps_count / 8 >= 10)
- printk(KERN_INFO "%s: WARNING: Receiving %ld packets per second.\n",
- strip_info->dev->name, rx_pps_count / 8);
- if (tx_pps_count / 8 >= 10)
- printk(KERN_INFO "%s: WARNING: Tx %ld packets per second.\n",
- strip_info->dev->name, tx_pps_count / 8);
- if (sx_pps_count / 8 >= 10)
- printk(KERN_INFO "%s: WARNING: Sending %ld packets per second.\n",
- strip_info->dev->name, sx_pps_count / 8);
- }
-
- spin_lock_bh(&strip_lock);
-
- strip_send(strip_info, skb);
-
- spin_unlock_bh(&strip_lock);
-
- if (skb)
- dev_kfree_skb(skb);
- return NETDEV_TX_OK;
-}
-
-/*
- * IdleTask periodically calls strip_xmit, so even when we have no IP packets
- * to send for an extended period of time, the watchdog processing still gets
- * done to ensure that the radio stays in Starmode
- */
-
-static void strip_IdleTask(unsigned long parameter)
-{
- strip_xmit(NULL, (struct net_device *) parameter);
-}
-
-/*
- * Create the MAC header for an arbitrary protocol layer
- *
- * saddr!=NULL means use this specific address (n/a for Metricom)
- * saddr==NULL means use default device source address
- * daddr!=NULL means use this destination address
- * daddr==NULL means leave destination address alone
- * (e.g. unresolved arp -- kernel will call
- * rebuild_header later to fill in the address)
- */
-
-static int strip_header(struct sk_buff *skb, struct net_device *dev,
- unsigned short type, const void *daddr,
- const void *saddr, unsigned len)
-{
- struct strip *strip_info = netdev_priv(dev);
- STRIP_Header *header = (STRIP_Header *) skb_push(skb, sizeof(STRIP_Header));
-
- /*printk(KERN_INFO "%s: strip_header 0x%04X %s\n", dev->name, type,
- type == ETH_P_IP ? "IP" : type == ETH_P_ARP ? "ARP" : ""); */
-
- header->src_addr = strip_info->true_dev_addr;
- header->protocol = htons(type);
-
- /*HexDump("strip_header", netdev_priv(dev), skb->data, skb->data + skb->len); */
-
- if (!daddr)
- return (-dev->hard_header_len);
-
- header->dst_addr = *(MetricomAddress *) daddr;
- return (dev->hard_header_len);
-}
-
-/*
- * Rebuild the MAC header. This is called after an ARP
- * (or in future other address resolution) has completed on this
- * sk_buff. We now let ARP fill in the other fields.
- * I think this should return zero if packet is ready to send,
- * or non-zero if it needs more time to do an address lookup
- */
-
-static int strip_rebuild_header(struct sk_buff *skb)
-{
-#ifdef CONFIG_INET
- STRIP_Header *header = (STRIP_Header *) skb->data;
-
- /* Arp find returns zero if if knows the address, */
- /* or if it doesn't know the address it sends an ARP packet and returns non-zero */
- return arp_find(header->dst_addr.c, skb) ? 1 : 0;
-#else
- return 0;
-#endif
-}
-
-
-/************************************************************************/
-/* Receiving routines */
-
-/*
- * This function parses the response to the ATS300? command,
- * extracting the radio version and serial number.
- */
-static void get_radio_version(struct strip *strip_info, __u8 * ptr, __u8 * end)
-{
- __u8 *p, *value_begin, *value_end;
- int len;
-
- /* Determine the beginning of the second line of the payload */
- p = ptr;
- while (p < end && *p != 10)
- p++;
- if (p >= end)
- return;
- p++;
- value_begin = p;
-
- /* Determine the end of line */
- while (p < end && *p != 10)
- p++;
- if (p >= end)
- return;
- value_end = p;
- p++;
-
- len = value_end - value_begin;
- len = min_t(int, len, sizeof(FirmwareVersion) - 1);
- if (strip_info->firmware_version.c[0] == 0)
- printk(KERN_INFO "%s: Radio Firmware: %.*s\n",
- strip_info->dev->name, len, value_begin);
- sprintf(strip_info->firmware_version.c, "%.*s", len, value_begin);
-
- /* Look for the first colon */
- while (p < end && *p != ':')
- p++;
- if (p >= end)
- return;
- /* Skip over the space */
- p += 2;
- len = sizeof(SerialNumber) - 1;
- if (p + len <= end) {
- sprintf(strip_info->serial_number.c, "%.*s", len, p);
- } else {
- printk(KERN_DEBUG
- "STRIP: radio serial number shorter (%zd) than expected (%d)\n",
- end - p, len);
- }
-}
-
-/*
- * This function parses the response to the ATS325? command,
- * extracting the radio battery voltage.
- */
-static void get_radio_voltage(struct strip *strip_info, __u8 * ptr, __u8 * end)
-{
- int len;
-
- len = sizeof(BatteryVoltage) - 1;
- if (ptr + len <= end) {
- sprintf(strip_info->battery_voltage.c, "%.*s", len, ptr);
- } else {
- printk(KERN_DEBUG
- "STRIP: radio voltage string shorter (%zd) than expected (%d)\n",
- end - ptr, len);
- }
-}
-
-/*
- * This function parses the responses to the AT~LA and ATS311 commands,
- * which list the radio's neighbours.
- */
-static void get_radio_neighbours(MetricomNodeTable * table, __u8 * ptr, __u8 * end)
-{
- table->num_nodes = 0;
- while (ptr < end && table->num_nodes < NODE_TABLE_SIZE) {
- MetricomNode *node = &table->node[table->num_nodes++];
- char *dst = node->c, *limit = dst + sizeof(*node) - 1;
- while (ptr < end && *ptr <= 32)
- ptr++;
- while (ptr < end && dst < limit && *ptr != 10)
- *dst++ = *ptr++;
- *dst++ = 0;
- while (ptr < end && ptr[-1] != 10)
- ptr++;
- }
- do_gettimeofday(&table->timestamp);
-}
-
-static int get_radio_address(struct strip *strip_info, __u8 * p)
-{
- MetricomAddress addr;
-
- if (string_to_radio_address(&addr, p))
- return (1);
-
- /* See if our radio address has changed */
- if (memcmp(strip_info->true_dev_addr.c, addr.c, sizeof(addr))) {
- MetricomAddressString addr_string;
- radio_address_to_string(&addr, &addr_string);
- printk(KERN_INFO "%s: Radio address = %s\n",
- strip_info->dev->name, addr_string.c);
- strip_info->true_dev_addr = addr;
- if (!strip_info->manual_dev_addr)
- *(MetricomAddress *) strip_info->dev->dev_addr =
- addr;
- /* Give the radio a few seconds to get its head straight, then send an arp */
- strip_info->gratuitous_arp = jiffies + 15 * HZ;
- strip_info->arp_interval = 1 * HZ;
- }
- return (0);
-}
-
-static int verify_checksum(struct strip *strip_info)
-{
- __u8 *p = strip_info->sx_buff;
- __u8 *end = strip_info->sx_buff + strip_info->sx_count - 4;
- u_short sum =
- (READHEX16(end[0]) << 12) | (READHEX16(end[1]) << 8) |
- (READHEX16(end[2]) << 4) | (READHEX16(end[3]));
- while (p < end)
- sum -= *p++;
- if (sum == 0 && strip_info->firmware_level == StructuredMessages) {
- strip_info->firmware_level = ChecksummedMessages;
- printk(KERN_INFO "%s: Radio provides message checksums\n",
- strip_info->dev->name);
- }
- return (sum == 0);
-}
-
-static void RecvErr(char *msg, struct strip *strip_info)
-{
- __u8 *ptr = strip_info->sx_buff;
- __u8 *end = strip_info->sx_buff + strip_info->sx_count;
- DumpData(msg, strip_info, ptr, end);
- strip_info->rx_errors++;
-}
-
-static void RecvErr_Message(struct strip *strip_info, __u8 * sendername,
- const __u8 * msg, u_long len)
-{
- if (has_prefix(msg, len, "001")) { /* Not in StarMode! */
- RecvErr("Error Msg:", strip_info);
- printk(KERN_INFO "%s: Radio %s is not in StarMode\n",
- strip_info->dev->name, sendername);
- }
-
- else if (has_prefix(msg, len, "002")) { /* Remap handle */
- /* We ignore "Remap handle" messages for now */
- }
-
- else if (has_prefix(msg, len, "003")) { /* Can't resolve name */
- RecvErr("Error Msg:", strip_info);
- printk(KERN_INFO "%s: Destination radio name is unknown\n",
- strip_info->dev->name);
- }
-
- else if (has_prefix(msg, len, "004")) { /* Name too small or missing */
- strip_info->watchdog_doreset = jiffies + LongTime;
-#if TICKLE_TIMERS
- {
- struct timeval tv;
- do_gettimeofday(&tv);
- printk(KERN_INFO
- "**** Got ERR_004 response at %02d.%06d\n",
- tv.tv_sec % 100, tv.tv_usec);
- }
-#endif
- if (!strip_info->working) {
- strip_info->working = TRUE;
- printk(KERN_INFO "%s: Radio now in starmode\n",
- strip_info->dev->name);
- /*
- * If the radio has just entered a working state, we should do our first
- * probe ASAP, so that we find out our radio address etc. without delay.
- */
- strip_info->watchdog_doprobe = jiffies;
- }
- if (strip_info->firmware_level == NoStructure && sendername) {
- strip_info->firmware_level = StructuredMessages;
- strip_info->next_command = 0; /* Try to enable checksums ASAP */
- printk(KERN_INFO
- "%s: Radio provides structured messages\n",
- strip_info->dev->name);
- }
- if (strip_info->firmware_level >= StructuredMessages) {
- /*
- * If this message has a valid checksum on the end, then the call to verify_checksum
- * will elevate the firmware_level to ChecksummedMessages for us. (The actual return
- * code from verify_checksum is ignored here.)
- */
- verify_checksum(strip_info);
- /*
- * If the radio has structured messages but we don't yet have all our information about it,
- * we should do probes without delay, until we have gathered all the information
- */
- if (!GOT_ALL_RADIO_INFO(strip_info))
- strip_info->watchdog_doprobe = jiffies;
- }
- }
-
- else if (has_prefix(msg, len, "005")) /* Bad count specification */
- RecvErr("Error Msg:", strip_info);
-
- else if (has_prefix(msg, len, "006")) /* Header too big */
- RecvErr("Error Msg:", strip_info);
-
- else if (has_prefix(msg, len, "007")) { /* Body too big */
- RecvErr("Error Msg:", strip_info);
- printk(KERN_ERR
- "%s: Error! Packet size too big for radio.\n",
- strip_info->dev->name);
- }
-
- else if (has_prefix(msg, len, "008")) { /* Bad character in name */
- RecvErr("Error Msg:", strip_info);
- printk(KERN_ERR
- "%s: Radio name contains illegal character\n",
- strip_info->dev->name);
- }
-
- else if (has_prefix(msg, len, "009")) /* No count or line terminator */
- RecvErr("Error Msg:", strip_info);
-
- else if (has_prefix(msg, len, "010")) /* Invalid checksum */
- RecvErr("Error Msg:", strip_info);
-
- else if (has_prefix(msg, len, "011")) /* Checksum didn't match */
- RecvErr("Error Msg:", strip_info);
-
- else if (has_prefix(msg, len, "012")) /* Failed to transmit packet */
- RecvErr("Error Msg:", strip_info);
-
- else
- RecvErr("Error Msg:", strip_info);
-}
-
-static void process_AT_response(struct strip *strip_info, __u8 * ptr,
- __u8 * end)
-{
- u_long len;
- __u8 *p = ptr;
- while (p < end && p[-1] != 10)
- p++; /* Skip past first newline character */
- /* Now ptr points to the AT command, and p points to the text of the response. */
- len = p - ptr;
-
-#if TICKLE_TIMERS
- {
- struct timeval tv;
- do_gettimeofday(&tv);
- printk(KERN_INFO "**** Got AT response %.7s at %02d.%06d\n",
- ptr, tv.tv_sec % 100, tv.tv_usec);
- }
-#endif
-
- if (has_prefix(ptr, len, "ATS300?"))
- get_radio_version(strip_info, p, end);
- else if (has_prefix(ptr, len, "ATS305?"))
- get_radio_address(strip_info, p);
- else if (has_prefix(ptr, len, "ATS311?"))
- get_radio_neighbours(&strip_info->poletops, p, end);
- else if (has_prefix(ptr, len, "ATS319=7"))
- verify_checksum(strip_info);
- else if (has_prefix(ptr, len, "ATS325?"))
- get_radio_voltage(strip_info, p, end);
- else if (has_prefix(ptr, len, "AT~LA"))
- get_radio_neighbours(&strip_info->portables, p, end);
- else
- RecvErr("Unknown AT Response:", strip_info);
-}
-
-static void process_ACK(struct strip *strip_info, __u8 * ptr, __u8 * end)
-{
- /* Currently we don't do anything with ACKs from the radio */
-}
-
-static void process_Info(struct strip *strip_info, __u8 * ptr, __u8 * end)
-{
- if (ptr + 16 > end)
- RecvErr("Bad Info Msg:", strip_info);
-}
-
-static struct net_device *get_strip_dev(struct strip *strip_info)
-{
- /* If our hardware address is *manually set* to zero, and we know our */
- /* real radio hardware address, try to find another strip device that has been */
- /* manually set to that address that we can 'transfer ownership' of this packet to */
- if (strip_info->manual_dev_addr &&
- !memcmp(strip_info->dev->dev_addr, zero_address.c,
- sizeof(zero_address))
- && memcmp(&strip_info->true_dev_addr, zero_address.c,
- sizeof(zero_address))) {
- struct net_device *dev;
- read_lock_bh(&dev_base_lock);
- for_each_netdev(&init_net, dev) {
- if (dev->type == strip_info->dev->type &&
- !memcmp(dev->dev_addr,
- &strip_info->true_dev_addr,
- sizeof(MetricomAddress))) {
- printk(KERN_INFO
- "%s: Transferred packet ownership to %s.\n",
- strip_info->dev->name, dev->name);
- read_unlock_bh(&dev_base_lock);
- return (dev);
- }
- }
- read_unlock_bh(&dev_base_lock);
- }
- return (strip_info->dev);
-}
-
-/*
- * Send one completely decapsulated datagram to the next layer.
- */
-
-static void deliver_packet(struct strip *strip_info, STRIP_Header * header,
- __u16 packetlen)
-{
- struct sk_buff *skb = dev_alloc_skb(sizeof(STRIP_Header) + packetlen);
- if (!skb) {
- printk(KERN_ERR "%s: memory squeeze, dropping packet.\n",
- strip_info->dev->name);
- strip_info->rx_dropped++;
- } else {
- memcpy(skb_put(skb, sizeof(STRIP_Header)), header,
- sizeof(STRIP_Header));
- memcpy(skb_put(skb, packetlen), strip_info->rx_buff,
- packetlen);
- skb->dev = get_strip_dev(strip_info);
- skb->protocol = header->protocol;
- skb_reset_mac_header(skb);
-
- /* Having put a fake header on the front of the sk_buff for the */
- /* benefit of tools like tcpdump, skb_pull now 'consumes' that */
- /* fake header before we hand the packet up to the next layer. */
- skb_pull(skb, sizeof(STRIP_Header));
-
- /* Finally, hand the packet up to the next layer (e.g. IP or ARP, etc.) */
- strip_info->rx_packets++;
- strip_info->rx_pps_count++;
-#ifdef EXT_COUNTERS
- strip_info->rx_bytes += packetlen;
-#endif
- netif_rx(skb);
- }
-}
-
-static void process_IP_packet(struct strip *strip_info,
- STRIP_Header * header, __u8 * ptr,
- __u8 * end)
-{
- __u16 packetlen;
-
- /* Decode start of the IP packet header */
- ptr = UnStuffData(ptr, end, strip_info->rx_buff, 4);
- if (!ptr) {
- RecvErr("IP Packet too short", strip_info);
- return;
- }
-
- packetlen = ((__u16) strip_info->rx_buff[2] << 8) | strip_info->rx_buff[3];
-
- if (packetlen > MAX_RECV_MTU) {
- printk(KERN_INFO "%s: Dropping oversized received IP packet: %d bytes\n",
- strip_info->dev->name, packetlen);
- strip_info->rx_dropped++;
- return;
- }
-
- /*printk(KERN_INFO "%s: Got %d byte IP packet\n", strip_info->dev->name, packetlen); */
-
- /* Decode remainder of the IP packet */
- ptr =
- UnStuffData(ptr, end, strip_info->rx_buff + 4, packetlen - 4);
- if (!ptr) {
- RecvErr("IP Packet too short", strip_info);
- return;
- }
-
- if (ptr < end) {
- RecvErr("IP Packet too long", strip_info);
- return;
- }
-
- header->protocol = htons(ETH_P_IP);
-
- deliver_packet(strip_info, header, packetlen);
-}
-
-static void process_ARP_packet(struct strip *strip_info,
- STRIP_Header * header, __u8 * ptr,
- __u8 * end)
-{
- __u16 packetlen;
- struct arphdr *arphdr = (struct arphdr *) strip_info->rx_buff;
-
- /* Decode start of the ARP packet */
- ptr = UnStuffData(ptr, end, strip_info->rx_buff, 8);
- if (!ptr) {
- RecvErr("ARP Packet too short", strip_info);
- return;
- }
-
- packetlen = 8 + (arphdr->ar_hln + arphdr->ar_pln) * 2;
-
- if (packetlen > MAX_RECV_MTU) {
- printk(KERN_INFO
- "%s: Dropping oversized received ARP packet: %d bytes\n",
- strip_info->dev->name, packetlen);
- strip_info->rx_dropped++;
- return;
- }
-
- /*printk(KERN_INFO "%s: Got %d byte ARP %s\n",
- strip_info->dev->name, packetlen,
- ntohs(arphdr->ar_op) == ARPOP_REQUEST ? "request" : "reply"); */
-
- /* Decode remainder of the ARP packet */
- ptr =
- UnStuffData(ptr, end, strip_info->rx_buff + 8, packetlen - 8);
- if (!ptr) {
- RecvErr("ARP Packet too short", strip_info);
- return;
- }
-
- if (ptr < end) {
- RecvErr("ARP Packet too long", strip_info);
- return;
- }
-
- header->protocol = htons(ETH_P_ARP);
-
- deliver_packet(strip_info, header, packetlen);
-}
-
-/*
- * process_text_message processes a <CR>-terminated block of data received
- * from the radio that doesn't begin with a '*' character. All normal
- * Starmode communication messages with the radio begin with a '*',
- * so any text that does not indicates a serial port error, a radio that
- * is in Hayes command mode instead of Starmode, or a radio with really
- * old firmware that doesn't frame its Starmode responses properly.
- */
-static void process_text_message(struct strip *strip_info)
-{
- __u8 *msg = strip_info->sx_buff;
- int len = strip_info->sx_count;
-
- /* Check for anything that looks like it might be our radio name */
- /* (This is here for backwards compatibility with old firmware) */
- if (len == 9 && get_radio_address(strip_info, msg) == 0)
- return;
-
- if (text_equal(msg, len, "OK"))
- return; /* Ignore 'OK' responses from prior commands */
- if (text_equal(msg, len, "ERROR"))
- return; /* Ignore 'ERROR' messages */
- if (has_prefix(msg, len, "ate0q1"))
- return; /* Ignore character echo back from the radio */
-
- /* Catch other error messages */
- /* (This is here for backwards compatibility with old firmware) */
- if (has_prefix(msg, len, "ERR_")) {
- RecvErr_Message(strip_info, NULL, &msg[4], len - 4);
- return;
- }
-
- RecvErr("No initial *", strip_info);
-}
-
-/*
- * process_message processes a <CR>-terminated block of data received
- * from the radio. If the radio is not in Starmode or has old firmware,
- * it may be a line of text in response to an AT command. Ideally, with
- * a current radio that's properly in Starmode, all data received should
- * be properly framed and checksummed radio message blocks, containing
- * either a starmode packet, or a other communication from the radio
- * firmware, like "INF_" Info messages and &COMMAND responses.
- */
-static void process_message(struct strip *strip_info)
-{
- STRIP_Header header = { zero_address, zero_address, 0 };
- __u8 *ptr = strip_info->sx_buff;
- __u8 *end = strip_info->sx_buff + strip_info->sx_count;
- __u8 sendername[32], *sptr = sendername;
- MetricomKey key;
-
- /*HexDump("Receiving", strip_info, ptr, end); */
-
- /* Check for start of address marker, and then skip over it */
- if (*ptr == '*')
- ptr++;
- else {
- process_text_message(strip_info);
- return;
- }
-
- /* Copy out the return address */
- while (ptr < end && *ptr != '*'
- && sptr < ARRAY_END(sendername) - 1)
- *sptr++ = *ptr++;
- *sptr = 0; /* Null terminate the sender name */
-
- /* Check for end of address marker, and skip over it */
- if (ptr >= end || *ptr != '*') {
- RecvErr("No second *", strip_info);
- return;
- }
- ptr++; /* Skip the second '*' */
-
- /* If the sender name is "&COMMAND", ignore this 'packet' */
- /* (This is here for backwards compatibility with old firmware) */
- if (!strcmp(sendername, "&COMMAND")) {
- strip_info->firmware_level = NoStructure;
- strip_info->next_command = CompatibilityCommand;
- return;
- }
-
- if (ptr + 4 > end) {
- RecvErr("No proto key", strip_info);
- return;
- }
-
- /* Get the protocol key out of the buffer */
- key.c[0] = *ptr++;
- key.c[1] = *ptr++;
- key.c[2] = *ptr++;
- key.c[3] = *ptr++;
-
- /* If we're using checksums, verify the checksum at the end of the packet */
- if (strip_info->firmware_level >= ChecksummedMessages) {
- end -= 4; /* Chop the last four bytes off the packet (they're the checksum) */
- if (ptr > end) {
- RecvErr("Missing Checksum", strip_info);
- return;
- }
- if (!verify_checksum(strip_info)) {
- RecvErr("Bad Checksum", strip_info);
- return;
- }
- }
-
- /*printk(KERN_INFO "%s: Got packet from \"%s\".\n", strip_info->dev->name, sendername); */
-
- /*
- * Fill in (pseudo) source and destination addresses in the packet.
- * We assume that the destination address was our address (the radio does not
- * tell us this). If the radio supplies a source address, then we use it.
- */
- header.dst_addr = strip_info->true_dev_addr;
- string_to_radio_address(&header.src_addr, sendername);
-
-#ifdef EXT_COUNTERS
- if (key.l == SIP0Key.l) {
- strip_info->rx_rbytes += (end - ptr);
- process_IP_packet(strip_info, &header, ptr, end);
- } else if (key.l == ARP0Key.l) {
- strip_info->rx_rbytes += (end - ptr);
- process_ARP_packet(strip_info, &header, ptr, end);
- } else if (key.l == ATR_Key.l) {
- strip_info->rx_ebytes += (end - ptr);
- process_AT_response(strip_info, ptr, end);
- } else if (key.l == ACK_Key.l) {
- strip_info->rx_ebytes += (end - ptr);
- process_ACK(strip_info, ptr, end);
- } else if (key.l == INF_Key.l) {
- strip_info->rx_ebytes += (end - ptr);
- process_Info(strip_info, ptr, end);
- } else if (key.l == ERR_Key.l) {
- strip_info->rx_ebytes += (end - ptr);
- RecvErr_Message(strip_info, sendername, ptr, end - ptr);
- } else
- RecvErr("Unrecognized protocol key", strip_info);
-#else
- if (key.l == SIP0Key.l)
- process_IP_packet(strip_info, &header, ptr, end);
- else if (key.l == ARP0Key.l)
- process_ARP_packet(strip_info, &header, ptr, end);
- else if (key.l == ATR_Key.l)
- process_AT_response(strip_info, ptr, end);
- else if (key.l == ACK_Key.l)
- process_ACK(strip_info, ptr, end);
- else if (key.l == INF_Key.l)
- process_Info(strip_info, ptr, end);
- else if (key.l == ERR_Key.l)
- RecvErr_Message(strip_info, sendername, ptr, end - ptr);
- else
- RecvErr("Unrecognized protocol key", strip_info);
-#endif
-}
-
-#define TTYERROR(X) ((X) == TTY_BREAK ? "Break" : \
- (X) == TTY_FRAME ? "Framing Error" : \
- (X) == TTY_PARITY ? "Parity Error" : \
- (X) == TTY_OVERRUN ? "Hardware Overrun" : "Unknown Error")
-
-/*
- * Handle the 'receiver data ready' interrupt.
- * This function is called by the 'tty_io' module in the kernel when
- * a block of STRIP data has been received, which can now be decapsulated
- * and sent on to some IP layer for further processing.
- */
-
-static void strip_receive_buf(struct tty_struct *tty, const unsigned char *cp,
- char *fp, int count)
-{
- struct strip *strip_info = tty->disc_data;
- const unsigned char *end = cp + count;
-
- if (!strip_info || strip_info->magic != STRIP_MAGIC
- || !netif_running(strip_info->dev))
- return;
-
- spin_lock_bh(&strip_lock);
-#if 0
- {
- struct timeval tv;
- do_gettimeofday(&tv);
- printk(KERN_INFO
- "**** strip_receive_buf: %3d bytes at %02d.%06d\n",
- count, tv.tv_sec % 100, tv.tv_usec);
- }
-#endif
-
-#ifdef EXT_COUNTERS
- strip_info->rx_sbytes += count;
-#endif
-
- /* Read the characters out of the buffer */
- while (cp < end) {
- if (fp && *fp)
- printk(KERN_INFO "%s: %s on serial port\n",
- strip_info->dev->name, TTYERROR(*fp));
- if (fp && *fp++ && !strip_info->discard) { /* If there's a serial error, record it */
- /* If we have some characters in the buffer, discard them */
- strip_info->discard = strip_info->sx_count;
- strip_info->rx_errors++;
- }
-
- /* Leading control characters (CR, NL, Tab, etc.) are ignored */
- if (strip_info->sx_count > 0 || *cp >= ' ') {
- if (*cp == 0x0D) { /* If end of packet, decide what to do with it */
- if (strip_info->sx_count > 3000)
- printk(KERN_INFO
- "%s: Cut a %d byte packet (%zd bytes remaining)%s\n",
- strip_info->dev->name,
- strip_info->sx_count,
- end - cp - 1,
- strip_info->
- discard ? " (discarded)" :
- "");
- if (strip_info->sx_count >
- strip_info->sx_size) {
- strip_info->rx_over_errors++;
- printk(KERN_INFO
- "%s: sx_buff overflow (%d bytes total)\n",
- strip_info->dev->name,
- strip_info->sx_count);
- } else if (strip_info->discard)
- printk(KERN_INFO
- "%s: Discarding bad packet (%d/%d)\n",
- strip_info->dev->name,
- strip_info->discard,
- strip_info->sx_count);
- else
- process_message(strip_info);
- strip_info->discard = 0;
- strip_info->sx_count = 0;
- } else {
- /* Make sure we have space in the buffer */
- if (strip_info->sx_count <
- strip_info->sx_size)
- strip_info->sx_buff[strip_info->
- sx_count] =
- *cp;
- strip_info->sx_count++;
- }
- }
- cp++;
- }
- spin_unlock_bh(&strip_lock);
-}
-
-
-/************************************************************************/
-/* General control routines */
-
-static int set_mac_address(struct strip *strip_info,
- MetricomAddress * addr)
-{
- /*
- * We're using a manually specified address if the address is set
- * to anything other than all ones. Setting the address to all ones
- * disables manual mode and goes back to automatic address determination
- * (tracking the true address that the radio has).
- */
- strip_info->manual_dev_addr =
- memcmp(addr->c, broadcast_address.c,
- sizeof(broadcast_address));
- if (strip_info->manual_dev_addr)
- *(MetricomAddress *) strip_info->dev->dev_addr = *addr;
- else
- *(MetricomAddress *) strip_info->dev->dev_addr =
- strip_info->true_dev_addr;
- return 0;
-}
-
-static int strip_set_mac_address(struct net_device *dev, void *addr)
-{
- struct strip *strip_info = netdev_priv(dev);
- struct sockaddr *sa = addr;
- printk(KERN_INFO "%s: strip_set_dev_mac_address called\n", dev->name);
- set_mac_address(strip_info, (MetricomAddress *) sa->sa_data);
- return 0;
-}
-
-static struct net_device_stats *strip_get_stats(struct net_device *dev)
-{
- struct strip *strip_info = netdev_priv(dev);
- static struct net_device_stats stats;
-
- memset(&stats, 0, sizeof(struct net_device_stats));
-
- stats.rx_packets = strip_info->rx_packets;
- stats.tx_packets = strip_info->tx_packets;
- stats.rx_dropped = strip_info->rx_dropped;
- stats.tx_dropped = strip_info->tx_dropped;
- stats.tx_errors = strip_info->tx_errors;
- stats.rx_errors = strip_info->rx_errors;
- stats.rx_over_errors = strip_info->rx_over_errors;
- return (&stats);
-}
-
-
-/************************************************************************/
-/* Opening and closing */
-
-/*
- * Here's the order things happen:
- * When the user runs "slattach -p strip ..."
- * 1. The TTY module calls strip_open;;
- * 2. strip_open calls strip_alloc
- * 3. strip_alloc calls register_netdev
- * 4. register_netdev calls strip_dev_init
- * 5. then strip_open finishes setting up the strip_info
- *
- * When the user runs "ifconfig st<x> up address netmask ..."
- * 6. strip_open_low gets called
- *
- * When the user runs "ifconfig st<x> down"
- * 7. strip_close_low gets called
- *
- * When the user kills the slattach process
- * 8. strip_close gets called
- * 9. strip_close calls dev_close
- * 10. if the device is still up, then dev_close calls strip_close_low
- * 11. strip_close calls strip_free
- */
-
-/* Open the low-level part of the STRIP channel. Easy! */
-
-static int strip_open_low(struct net_device *dev)
-{
- struct strip *strip_info = netdev_priv(dev);
-
- if (strip_info->tty == NULL)
- return (-ENODEV);
-
- if (!allocate_buffers(strip_info, dev->mtu))
- return (-ENOMEM);
-
- strip_info->sx_count = 0;
- strip_info->tx_left = 0;
-
- strip_info->discard = 0;
- strip_info->working = FALSE;
- strip_info->firmware_level = NoStructure;
- strip_info->next_command = CompatibilityCommand;
- strip_info->user_baud = tty_get_baud_rate(strip_info->tty);
-
- printk(KERN_INFO "%s: Initializing Radio.\n",
- strip_info->dev->name);
- ResetRadio(strip_info);
- strip_info->idle_timer.expires = jiffies + 1 * HZ;
- add_timer(&strip_info->idle_timer);
- netif_wake_queue(dev);
- return (0);
-}
-
-
-/*
- * Close the low-level part of the STRIP channel. Easy!
- */
-
-static int strip_close_low(struct net_device *dev)
-{
- struct strip *strip_info = netdev_priv(dev);
-
- if (strip_info->tty == NULL)
- return -EBUSY;
- clear_bit(TTY_DO_WRITE_WAKEUP, &strip_info->tty->flags);
- netif_stop_queue(dev);
-
- /*
- * Free all STRIP frame buffers.
- */
- kfree(strip_info->rx_buff);
- strip_info->rx_buff = NULL;
- kfree(strip_info->sx_buff);
- strip_info->sx_buff = NULL;
- kfree(strip_info->tx_buff);
- strip_info->tx_buff = NULL;
-
- del_timer(&strip_info->idle_timer);
- return 0;
-}
-
-static const struct header_ops strip_header_ops = {
- .create = strip_header,
- .rebuild = strip_rebuild_header,
-};
-
-
-static const struct net_device_ops strip_netdev_ops = {
- .ndo_open = strip_open_low,
- .ndo_stop = strip_close_low,
- .ndo_start_xmit = strip_xmit,
- .ndo_set_mac_address = strip_set_mac_address,
- .ndo_get_stats = strip_get_stats,
- .ndo_change_mtu = strip_change_mtu,
-};
-
-/*
- * This routine is called by DDI when the
- * (dynamically assigned) device is registered
- */
-
-static void strip_dev_setup(struct net_device *dev)
-{
- /*
- * Finish setting up the DEVICE info.
- */
-
- dev->trans_start = 0;
- dev->tx_queue_len = 30; /* Drop after 30 frames queued */
-
- dev->flags = 0;
- dev->mtu = DEFAULT_STRIP_MTU;
- dev->type = ARPHRD_METRICOM; /* dtang */
- dev->hard_header_len = sizeof(STRIP_Header);
- /*
- * netdev_priv(dev) Already holds a pointer to our struct strip
- */
-
- *(MetricomAddress *)dev->broadcast = broadcast_address;
- dev->dev_addr[0] = 0;
- dev->addr_len = sizeof(MetricomAddress);
-
- dev->header_ops = &strip_header_ops,
- dev->netdev_ops = &strip_netdev_ops;
-}
-
-/*
- * Free a STRIP channel.
- */
-
-static void strip_free(struct strip *strip_info)
-{
- spin_lock_bh(&strip_lock);
- list_del_rcu(&strip_info->list);
- spin_unlock_bh(&strip_lock);
-
- strip_info->magic = 0;
-
- free_netdev(strip_info->dev);
-}
-
-
-/*
- * Allocate a new free STRIP channel
- */
-static struct strip *strip_alloc(void)
-{
- struct list_head *n;
- struct net_device *dev;
- struct strip *strip_info;
-
- dev = alloc_netdev(sizeof(struct strip), "st%d",
- strip_dev_setup);
-
- if (!dev)
- return NULL; /* If no more memory, return */
-
-
- strip_info = netdev_priv(dev);
- strip_info->dev = dev;
-
- strip_info->magic = STRIP_MAGIC;
- strip_info->tty = NULL;
-
- strip_info->gratuitous_arp = jiffies + LongTime;
- strip_info->arp_interval = 0;
- init_timer(&strip_info->idle_timer);
- strip_info->idle_timer.data = (long) dev;
- strip_info->idle_timer.function = strip_IdleTask;
-
-
- spin_lock_bh(&strip_lock);
- rescan:
- /*
- * Search the list to find where to put our new entry
- * (and in the process decide what channel number it is
- * going to be)
- */
- list_for_each(n, &strip_list) {
- struct strip *s = hlist_entry(n, struct strip, list);
-
- if (s->dev->base_addr == dev->base_addr) {
- ++dev->base_addr;
- goto rescan;
- }
- }
-
- sprintf(dev->name, "st%ld", dev->base_addr);
-
- list_add_tail_rcu(&strip_info->list, &strip_list);
- spin_unlock_bh(&strip_lock);
-
- return strip_info;
-}
-
-/*
- * Open the high-level part of the STRIP channel.
- * This function is called by the TTY module when the
- * STRIP line discipline is called for. Because we are
- * sure the tty line exists, we only have to link it to
- * a free STRIP channel...
- */
-
-static int strip_open(struct tty_struct *tty)
-{
- struct strip *strip_info = tty->disc_data;
-
- /*
- * First make sure we're not already connected.
- */
-
- if (strip_info && strip_info->magic == STRIP_MAGIC)
- return -EEXIST;
-
- /*
- * We need a write method.
- */
-
- if (tty->ops->write == NULL || tty->ops->set_termios == NULL)
- return -EOPNOTSUPP;
-
- /*
- * OK. Find a free STRIP channel to use.
- */
- if ((strip_info = strip_alloc()) == NULL)
- return -ENFILE;
-
- /*
- * Register our newly created device so it can be ifconfig'd
- * strip_dev_init() will be called as a side-effect
- */
-
- if (register_netdev(strip_info->dev) != 0) {
- printk(KERN_ERR "strip: register_netdev() failed.\n");
- strip_free(strip_info);
- return -ENFILE;
- }
-
- strip_info->tty = tty;
- tty->disc_data = strip_info;
- tty->receive_room = 65536;
-
- tty_driver_flush_buffer(tty);
-
- /*
- * Restore default settings
- */
-
- strip_info->dev->type = ARPHRD_METRICOM; /* dtang */
-
- /*
- * Set tty options
- */
-
- tty->termios->c_iflag |= IGNBRK | IGNPAR; /* Ignore breaks and parity errors. */
- tty->termios->c_cflag |= CLOCAL; /* Ignore modem control signals. */
- tty->termios->c_cflag &= ~HUPCL; /* Don't close on hup */
-
- printk(KERN_INFO "STRIP: device \"%s\" activated\n",
- strip_info->dev->name);
-
- /*
- * Done. We have linked the TTY line to a channel.
- */
- return (strip_info->dev->base_addr);
-}
-
-/*
- * Close down a STRIP channel.
- * This means flushing out any pending queues, and then restoring the
- * TTY line discipline to what it was before it got hooked to STRIP
- * (which usually is TTY again).
- */
-
-static void strip_close(struct tty_struct *tty)
-{
- struct strip *strip_info = tty->disc_data;
-
- /*
- * First make sure we're connected.
- */
-
- if (!strip_info || strip_info->magic != STRIP_MAGIC)
- return;
-
- unregister_netdev(strip_info->dev);
-
- tty->disc_data = NULL;
- strip_info->tty = NULL;
- printk(KERN_INFO "STRIP: device \"%s\" closed down\n",
- strip_info->dev->name);
- strip_free(strip_info);
- tty->disc_data = NULL;
-}
-
-
-/************************************************************************/
-/* Perform I/O control calls on an active STRIP channel. */
-
-static int strip_ioctl(struct tty_struct *tty, struct file *file,
- unsigned int cmd, unsigned long arg)
-{
- struct strip *strip_info = tty->disc_data;
-
- /*
- * First make sure we're connected.
- */
-
- if (!strip_info || strip_info->magic != STRIP_MAGIC)
- return -EINVAL;
-
- switch (cmd) {
- case SIOCGIFNAME:
- if(copy_to_user((void __user *) arg, strip_info->dev->name, strlen(strip_info->dev->name) + 1))
- return -EFAULT;
- break;
- case SIOCSIFHWADDR:
- {
- MetricomAddress addr;
- //printk(KERN_INFO "%s: SIOCSIFHWADDR\n", strip_info->dev->name);
- if(copy_from_user(&addr, (void __user *) arg, sizeof(MetricomAddress)))
- return -EFAULT;
- return set_mac_address(strip_info, &addr);
- }
- default:
- return tty_mode_ioctl(tty, file, cmd, arg);
- break;
- }
- return 0;
-}
-
-#ifdef CONFIG_COMPAT
-static long strip_compat_ioctl(struct tty_struct *tty, struct file *file,
- unsigned int cmd, unsigned long arg)
-{
- switch (cmd) {
- case SIOCGIFNAME:
- case SIOCSIFHWADDR:
- return strip_ioctl(tty, file, cmd,
- (unsigned long)compat_ptr(arg));
- }
- return -ENOIOCTLCMD;
-}
-#endif
-
-/************************************************************************/
-/* Initialization */
-
-static struct tty_ldisc_ops strip_ldisc = {
- .magic = TTY_LDISC_MAGIC,
- .name = "strip",
- .owner = THIS_MODULE,
- .open = strip_open,
- .close = strip_close,
- .ioctl = strip_ioctl,
-#ifdef CONFIG_COMPAT
- .compat_ioctl = strip_compat_ioctl,
-#endif
- .receive_buf = strip_receive_buf,
- .write_wakeup = strip_write_some_more,
-};
-
-/*
- * Initialize the STRIP driver.
- * This routine is called at boot time, to bootstrap the multi-channel
- * STRIP driver
- */
-
-static char signon[] __initdata =
- KERN_INFO "STRIP: Version %s (unlimited channels)\n";
-
-static int __init strip_init_driver(void)
-{
- int status;
-
- printk(signon, StripVersion);
-
-
- /*
- * Fill in our line protocol discipline, and register it
- */
- if ((status = tty_register_ldisc(N_STRIP, &strip_ldisc)))
- printk(KERN_ERR "STRIP: can't register line discipline (err = %d)\n",
- status);
-
- /*
- * Register the status file with /proc
- */
- proc_net_fops_create(&init_net, "strip", S_IFREG | S_IRUGO, &strip_seq_fops);
-
- return status;
-}
-
-module_init(strip_init_driver);
-
-static const char signoff[] __exitdata =
- KERN_INFO "STRIP: Module Unloaded\n";
-
-static void __exit strip_exit_driver(void)
-{
- int i;
- struct list_head *p,*n;
-
- /* module ref count rules assure that all entries are unregistered */
- list_for_each_safe(p, n, &strip_list) {
- struct strip *s = list_entry(p, struct strip, list);
- strip_free(s);
- }
-
- /* Unregister with the /proc/net file here. */
- proc_net_remove(&init_net, "strip");
-
- if ((i = tty_unregister_ldisc(N_STRIP)))
- printk(KERN_ERR "STRIP: can't unregister line discipline (err = %d)\n", i);
-
- printk(signoff);
-}
-
-module_exit(strip_exit_driver);
-
-MODULE_AUTHOR("Stuart Cheshire <cheshire@cs.stanford.edu>");
-MODULE_DESCRIPTION("Starmode Radio IP (STRIP) Device Driver");
-MODULE_LICENSE("Dual BSD/GPL");
-
-MODULE_SUPPORTED_DEVICE("Starmode Radio IP (STRIP) modem");
projects / GitHub / LineageOS / android_kernel_motorola_exynos9610.git / commitdiff