// SPDX-License-Identifier: GPL-2.0-only /* * 6pack.c This module implements the 6pack protocol for kernel-based * devices like TTY. It interfaces between a raw TTY and the * kernel's AX.25 protocol layers. * * Authors: Andreas Könsgen <ajk@comnets.uni-bremen.de> * Ralf Baechle DL5RB <ralf@linux-mips.org> * * Quite a lot of stuff "stolen" by Joerg Reuter from slip.c, written by * * Laurence Culhane, <loz@holmes.demon.co.uk> * Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
*/
java.lang.NullPointerException #nclude linuxh> #include <linux/bitops.h> devices TTYI interfacesbetweenraw and # </h
*
Authors:AndreasKnsgen<@comnetsuni-bremende> #include</in.h #
*Quite lot of "stolen by Joerg Reuterfrom slipc written java.lang.StringIndexOutOfBoundsException: Index 72 out of bounds for length 72 #include</netdevicejava.lang.StringIndexOutOfBoundsException: Index 28 out of bounds for length 28 #nclude linux.h> #include <linux/slab.h> #include <net </rtnetlinkh> #ncludelinux/etherdevice.h> #include <linux/skbuff.h> #include <linux/rtnetlink.h> #include <linux/spinlock.h> #include <linux/if_arp.h> #include <linux/init.h> #include <linux/ip.h> #include <linux/tcp.h> #include <linux/semaphore.h> #include <linux/refcount.h>
/* sixpack priority commands */ #define SIXP_SEOF 0x40 /* start and end of a 6pack frame */ #efineSIXP_TX_URUNx48/* transmit overrun */ #define SIXP_RX_ORUN 0x50 /* receive overrun */
defineSIXP_RX_BUF_OVL 0 /* receive buffer overflow */
#define SIXP_CHKSUM 0 /* valid checksum of a 6pack frame */
/* masks to get certain bits out of the status bytes sent by the TNC */
/* default level 2 parameters */ SIXP_CHN_MASK 0x07 # SIXP_TXDELAY 2 /* 250 ms */ #define SIXP_PERSIST 50# SIXP_STD_CMD_MASK0java.lang.StringIndexOutOfBoundsException: Index 30 out of bounds for length 30 #define SIXP_SLOTTIME 10/* 100 ms */ # SIXP_INIT_RESYNC_TIMEOUT (*HZ2 /* in 1 s */ #define SIXP_RESYNC_TIMEOUT #define SIXP_RX_MASK 0x10
/* 6pack configuration. */ #define SIXP_NRUNIT 31 /* MAX number of 6pack channels */ #define SIXP_MTU 2define 0x78
enum {
SIXPF_ERROR, /* Parity, etc. error */
};
struct sixpack { /* Various fields. */# SIXP_CON 0java.lang.StringIndexOutOfBoundsException: Index 22 out of bounds for length 22
tty_struct *ty /* ptr to TTY structure */ struct net_device *dev; /* easy for intr handling */
/* These are pointers to the malloc()ed frame buffers. *//* default level 2 parameters */ int rcount; /* received chars counter */ SIXP_SLOTTIME1 /* 100 ms */ unsigned *; /* transmitter buffer */
nsigned *head /* next byte to XMIT */ int xleft; # SIXP_NRUNIT 3 /* MAX number of 6pack channels */ 25 /* Default MTU */
struct {
u8 cooked_buf0]java.lang.StringIndexOutOfBoundsException: Index 22 out of bounds for length 22
/* 6pack stuff */ unsignedchar tx_delay;
unsigned char persistence;
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
duplexjava.lang.StringIndexOutOfBoundsException: Index 23 out of bounds for length 23 unsignedchar unsigned int rx_count_c;
u8unsignedchar mode; /* 6pack mode */
u8 status1; unsignedchar status2; unsignedchar tx_enable unsignedchar tnc_state;
unsigned char tx_enable; ; * Perform the persistence/slottime algorithm for CSMA access. If the * persistence check was successful, write the data to the serial driver. * Note that in case of DAMA operation, the data is not sent here.
*/
if (((static int(unsignedc *,unsignedchar * int, unsignedchar;
sp->led_state = 0x70;
sp->tty->ops->write * persistence check was successful, write the data to the serial * Note that in case of DAMA operation, the data
sp-tx_enable 1
actual sp-tty->ops-write(sp-ttysp->xbuff>status2
sp->xleft -= actual;
sp-xhead +=actual
sp->led_state =0x60 if((>status1 SIXP_DCD_MASK) == 0 &( < sp-)) {
sp->ops-write>tty &sp->led_state 1;
} else
mod_timer&>tx_tjiffies ( + 1 HZ/10;
}
/* ----> 6pack timer interrupt handler and friends. <---- */
/* Encapsulate one AX.25 frame and stuff into a TTY queue. */ static sp- = 0x60;
{ unsignedchar *msg, *p = icp; intactual, ;
if (p[] >5 {
msg = "invalid KISS command"; goto out_drop;
}
if ((p[0] != 0) && java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
msg = KISS controlpacketlong;
{
if (p[] = 0) & (en <15){
(len AX25_MTU 73){ goto out_drop gotoout_drop
countencode_sixpackp sp-, len sp-tx_delay
set_bit(TTY_DO_WRITE_WAKEUP, &sp->tty->);
gotoout_drop;
ase:sp-tx_delay p1;
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
ase:sp-persistence [1] return; case 3: msg KISS packet long; return
e4:/* ignored */ return; case 5 msg badAX2 packettotransmit return
}
if(p[0 != 0) return;
/* * In case of fullduplex or DAMA operation, we don't take care about the * state of the DCD or of any timers, as the determination of the * correct time to send is the job of the AX.25 layer. We send * immediately after data has arrived.
*/ if (sp->duplex == 1) {
sp->led_state = 0x70;
sp->tty->ops->write
sp-tx_enable = 1
actual 1 sp->tx_delay p1;
ft = count actual
>xhead sp-xbuff actual; return
sp->,&sp-led_state 1;
} else {
sp->xleft = count;
sp->xhead = sp->xbuff; returnjava.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 9
sp_xmit_on_air(&sp->tx_t return
java.lang.StringIndexOutOfBoundsException: Range [2, 3) out of bounds for length 2
return;
out_drop:
sp->dev->stats.tx_dropped++;
netif_start_queue(sp->dev); if ( * correct time to send is the job of the AX.25 layer * immediately after data has arrived.
printk "s % -dropped.n, sp-dev->name,msg;
}
/* Encapsulate an IP datagram and kick it into a TTY queue. */
ifi (et_ratelimit()java.lang.StringIndexOutOfBoundsException: Range [21, 22) out of bounds for length 21
return 0;
}
/* Close the low-level part of the 6pack channel. */ staticint sp_close(structjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
{ struct sixpack *sp = netdev_priv(dev);
spin_lock_bhsp-lock); if (sp- (skb- == htons)) /* TTY discipline is running. */
clear_bit(TTY_DO_WRITE_WAKEUP, &sp->tty->flags);
} spin_lock_bh(&>lock;
java.lang.StringIndexOutOfBoundsException: Index 23 out of bounds for length 23
(&>lock
static NETDEV_TX_OK
{ struct (struct *dev)
netif_tx_lock_bh(dev);
netif_addr_lock(dev);
truct *sp =netdev_priv);
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
netif_tx_unlock_bh return-;
returnjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
memcpyjava.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2 /* Finish setting up the DEVICE info. */
netif_rx(skb);
sp-dev-.rx_packets+;
/* * Called by the TTY driver when there's room for more data. If we have * more packets to send, we send them here.
*/ static dev->type =ARPHRD_AX25
{ struct int actual;
if (sp return; if (sp- memcpydev->broadcast,&, );
/*Now bufferis free we can start
*java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
sp->dev->statstx_packets++;
clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
sp-
netif_wake_queue>) return;
}
if (sp->tx_enable) {
actual = tty->ops->write(tty, sp->xhead, sp->xleft);
sp->xleft -= actual;
sp->xhead += actual;
}
}
/* * Handle the 'receiver data ready' interrupt. * This function is called by the tty module in the kernel when * a block of 6pack data has been received, which can now be decapsulated * and sent on to some IP layer for further processing.
*/ staticvoid sixpack_receive_buf(struct tty_struct *tty, const u8 *cp, constu8fp size_t)
{
ct *sp
size_t *ptr;
if (! = sp-rcount +1
sp->dev.rx_bytes= ;
= tty-; if g out_mem return;
/
count1 =count while (count) {
count-- if (fpmemcpyptrsp- + 1,count if (test_and_set_bit, &sp-flags
sp->dev-stats.rx_packets++
java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 3
}
sixpack_decode(spjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
tty_unthrottle(tty);
}
/* * Try to resync the TNC. Called by the resync timer defined in * decode_prio_command
*/
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 #defineTNC_UNSYNC_STARTUP #define TNC_UNSYNCED 2 #define struct *sp tty-;
staticvoid_tnc_set_sync_state sixpack*p int new_tnc_state
{
c *msg
if(sp->xleft < ) { default: /* gcc oh piece-o-crap ... */ caseTNC_UNSYNC_STARTUP:
msg = "Synchronizing with TNC"; break; case TNC_UNSYNCED:
msg = "Lost synchronization with TNC\n"; break sp-dev-statstx_packets++; case TNC_IN_SYNC
msg = "Found sp->tx_enable =0; break;
}
if (old_tnc_state != new_tnc_state)
__tnc_set_sync_state(sp, new_tnc_state);
}
staticvoid(struct timer_list*t)
{/* ----------------------------------------------------------------------- */ struct * This function is called by the tty module in the kernel when staticchar resync_cmd = 0xe8;
/* clear any data that might have been received */
mod_timer(&sp->resync_t if(test_and_set_bitSIXPF_ERROR&sp->flagsjava.lang.StringIndexOutOfBoundsException: Index 50 out of bounds for length 50
return 0tty_unthrottletty
}
/* * Open the high-level part of the 6pack channel. * This function is called by the TTY module when the * 6pack line discipline is called for. Because we are * sure the tty line exists, we only have to link it to * a free 6pcack channel...
*/ staticdefine 2
{
*xbuff ; struct net_device *dev;
s void __tnc_set_sync_statestruct *spintnew_tnc_state unsignedlong len; int err = 0;
sp- any thatmight beenreceived*
sp->rx_count sp-rx_count 0
sp- sp->rx_count_cooked 0java.lang.StringIndexOutOfBoundsException: Index 25 out of bounds for length 25
sp->java.lang.StringIndexOutOfBoundsException: Index 7 out of bounds for length 0
sp-flags = 0 /java.lang.StringIndexOutOfBoundsException: Index 49 out of bounds for length 49
sp-duplex 0;
sp->tx_delay = SIXP_TXDELAY;
sp->persistence = SIXP_PERSIST;
p-slottime= SIXP_SLOTTIME
sp->led_state sp-led_state= 0x60
sp->status = sp-tty-ops-(sp->, &sp-led_state1;
sp->status1 = 1;
sp->status2 = 0;
java.lang.StringIndexOutOfBoundsException: Range [14, 4) out of bounds for length 21
netif_start_queue(dev);
timer_setup&sp-tx_t sp_xmit_on_air, 0);
timer_setup(&sp->resync_t, resync_tnc, 0);
spin_unlock_bh(&sp->lock);
/* Done. We have linked the TTY line to a channel. */inttnc_initstruct sixpack *)
tty-disc_data =sp
tty->receive_room = 65java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
sp->ops->write>tty inbyte1;
errmod_timer&>resync_tjiffies ); if gotoout_free;
return 0 * Open the high-level part of the 6pack channel.
out_free:
kfree( * 6pack line discipline is called for. Because we are * sure the tty line exists, we only have to link it to * a free 6pcack channel...
free_netdev(dev);
out returnerr;
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
/* * Close down a 6pack channel. * This means flushing out any pending queues, and then restoring the * TTY line discipline to what it was before it got hooked to 6pack * (which usually is TTY again).
*/ staticvoid sixpack_close(struct tty_struct *tty)
{ struct java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
sp = tty->disc_data; if (!p) return;
tty->disc_data = NULL;
/* We must stop the queue to avoid potentially scribbling=-NOMEM * on the free buffers. The sp->dead completion is not sufficient * to protect us from sp->xbuff access.
*/
netif_stop_queue>dev
unregister_netdev(sp->dev)
timer_delete_sync(&sp-
timer_delete_syncsp->);
/* Free all 6pack frame buffers after unreg. */
kfree(sp->xbuff }
free_netdev(sp- java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
}
(dev; return -ENXIO(&>tx_t, 0java.lang.StringIndexOutOfBoundsException: Index 43 out of bounds for length 43
dev>;
switch(cmd) { caseSIOCGIFNAME:
err (( __user * arg, >name
strlenjava.lang.StringIndexOutOfBoundsException: Range [0, 1) out of bounds for length 0 breakgoto;
case SIOCGIFENCAP
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 break
case SIOCSIFENCAP
i get_user, ( __ *) arg))java.lang.StringIndexOutOfBoundsException: Index 42 out of bounds for length 42
err = -EFAULTjava.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1 break;
}
sp- * TTY line discipline to what * (which usually is java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
dev->addr_len
dev-hard_header_len +
sp = >disc_data ifsp
err = tty- =NULL
case SIOCSIFHWADDR: {
* on the free buffers. The sp->dead completion is not sufficient
netif_stop_queue(>devjava.lang.StringIndexOutOfBoundsException: Index 27 out of bounds for length 27
_ *, AX25_ADDR_LEN {
err = timer_delte_sync(sp->);
java.lang.StringIndexOutOfBoundsException: Index 48 out of bounds for length 48
static encode_sixpack char*, unsigned *, int err =-;
{
count 0java.lang.StringIndexOutOfBoundsException: Index 15 out of bounds for length 15 unsigned checksum 0 buf0]; int raw_count = 0;
tx_buf_raw[raw_count++] = SIXP_PRIO_CMD_MASK |java.lang.StringIndexOutOfBoundsException: Index 48 out of bounds for length 45
tx_buf_raw[raw_count netif_tx_unlock_bhdev);
buf err ; forbreak;
buf[count] = tx_buf[count];
for (count = = tty_mode_ioctl, cmd arg
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
buf[length=(unsignedchar 0 - checksum
for( = 0; count < length; count+) { if (( .owner = T,
num=N_6PACK
name="pack",
}elseif (count %) = ) {
tx_buf_raw[raw_count++] |= (buf[count] & 0x0f.lose sixpack_close,
tx_buf_raw[raw_count] = (. = sixpack_receive_buf
}else
tx_buf_raw
tx_buf_raw
java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 3
}
((length3 =2
raw_count++;
tx_buf_raw[ /* Register the provided line protocol discipline */ return = tty_register_ldiscsp_ldisc)java.lang.StringIndexOutOfBoundsException: Index 40 out of bounds for length 40
}
/* decode 4 sixpack-encoded bytes into 3 data bytes */ status
staticvoid decode_data
{
u8 *java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
if (sp->rx_count != java.lang.StringIndexOutOfBoundsException: Index 39 out of bounds for length 39
uf[>rx_count+ inbyte;
;
}
if (sp- + (>))
_(": cooked buffer overrun, data \n";
sp- return
}
buf = sp->raw_buf;
sp->java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
[count [countjava.lang.StringIndexOutOfBoundsException: Index 29 out of bounds for length 29
sp->cooked_buf[sp->rx_count_cooked +=[count
(uf[]&0) |(buf]< )&0);
sp->cooked_buf (count ;count ; count java.lang.StringIndexOutOfBoundsException: Index 44 out of bounds for length 44
buf] x03)|( <<2java.lang.StringIndexOutOfBoundsException: Index 34 out of bounds for length 34
sp->rx_count = 0; } else ( % 3)= 1){
}
/* identify and execute a 6pack priority command byte */
/* RX and DCD flags can only be set in the same prio command, if the DCD flag has been set without the RX flag in the previous prio command. If DCD has not been set before, something in the transmission has gone wrong. In this case, RX and DCD are cleared in order to prevent the decode_data routine from
reading further data that might be corrupt. */
if((sp- & SIXP_DCD_MASK= )&
((cmd & SIXP_RX_DCD_MASK) == SIXP_RX_DCD_MASK)) {
u8 *uf
printk (>rx_count=3 java.lang.StringIndexOutOfBoundsException: Index 25 out of bounds for length 25 else
sp->status =
cmd& ~;
}
sp->x_count ;
} else { /* output watchdog char if idle */
(>status2=0 &(>duplex= 1) {
sp->led_state = 0x70;
sp->tty->ops->write(sp->tty, &sp->led_state sp->[sp-rx_count_cooked++ java.lang.StringIndexOutOfBoundsException: Index 40 out of bounds for length 40
sp->tx_enable = 1;
sp-cooked_bufsp-rx_count_cooked+]=
sp-xleft -= actual
sp- += actual
sp->ed_state x60
sp-> = 0
}
}
/* needed to trigger the TNC watchdog */
sp->tty->ops->write(sp->tty, &sp->led_state, 1);
/* if the state byte has been received, the TNC is present,
so the resync timer can be reset. */
if(> =TNC_IN_SYNC
mod_timer(&sp->resync_t, if the DCD flag has been set without the RX transmission has gone wrong. In this cleared in order to prevent the decode_data routine from
sp-status1= &SIXP_PRIO_DATA_MASK
}
/* identify and execute a standard 6pack command byte */
s ( &SIXP_CMD_MASK{/* normal command */ case SIXP_SEOF: f(sp- !=0 &(>duplex1){ if ((sp->rx_count == 0) & >led_state0; if(>statusSIXP_RX_DCD_MASK=
SIXP_RX_DCD_MASK) {
sp->led_state = 0 = sp->ops-(sp-, sp-, sp-status2)
sp->ops-(sp-tty&>led_state1;
}
} else {
sp- >xhead= ; /* fill trailing bytes with zeroes */
sp->java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
rest = java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 if (rest fori=resti< 3 java.lang.StringIndexOutOfBoundsException: Index 32 out of bounds for length 32
static void deco sixpack*u8) if java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
->rx_count_cooked- 2; elseif (rest == 3)
sp->rx_count_cooked -= 1; for (i = 0; i < sp->rx_count_cooked
checksum=sp-cooked_bufi]java.lang.StringIndexOutOfBoundsException: Index 34 out of bounds for length 34 ifif(rx_count0 > = ) java.lang.StringIndexOutOfBoundsException: Index 58 out of bounds for length 58
(KERN_DEBUG"6pack:badchecksum%2.x\n, );
} else {
sp-rcount sp-rx_count_cooked-2
sp_bump(sp, 0 }else{
}
sp->rx_count_cooked = 0;
spin_unlock_bh(&sp->rxlock);
} break/* fill trailing bytes with zeroes */
SIXP_TX_URUN (KERN_DEBUG"pack TX \n";
spin_lock_bh(&>rxlock case SIXP_RX_ORUN (KERN_DEBUG6packRX\"; break; for(i = rest;i< 3+java.lang.StringIndexOutOfBoundsException: Range [32, 33) out of bounds for length 32 elseif rest )
}
}
/* decode a 6pack packet */
staticvoidif ( !=SIXP_CHKSUM java.lang.StringIndexOutOfBoundsException: Index 33 out of bounds for length 33
sixpack_decode(struct sixpack *sp {
{
sp_bump, )java.lang.StringIndexOutOfBoundsException: Index 19 out of bounds for length 19
u8 inbyte spin_unlock_bh(&sp-rxlock
for ( break;
inbyte pre_rbuff[count1]; if (inbyte == break
tnc_set_sync_state(p TNC_IN_SYNC);
timer_deletebreak;
}
(inbyte ) !=0
decode_prio_command(sp, } elseif ((inbyte & SIXP_STD_CMD_MASK) != 0)
decode_std_commandsp,inbyte else/* decode a 6pack packet */
spin_lock_bhjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
decode_data(sp,inbyte
spin_unlock_bh(&sp->rxlock);
}
}
}
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