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linux-next/drivers/net/wan/hdlc_ppp.c
Kees Cook e99e88a9d2 treewide: setup_timer() -> timer_setup() 
This converts all remaining cases of the old setup_timer() API into using
timer_setup(), where the callback argument is the structure already
holding the struct timer_list. These should have no behavioral changes,
since they just change which pointer is passed into the callback with
the same available pointers after conversion. It handles the following
examples, in addition to some other variations.

Casting from unsigned long:

    void my_callback(unsigned long data)
    {
        struct something *ptr = (struct something *)data;
    ...
    }
    ...
    setup_timer(&ptr->my_timer, my_callback, ptr);

and forced object casts:

    void my_callback(struct something *ptr)
    {
    ...
    }
    ...
    setup_timer(&ptr->my_timer, my_callback, (unsigned long)ptr);

become:

    void my_callback(struct timer_list *t)
    {
        struct something *ptr = from_timer(ptr, t, my_timer);
    ...
    }
    ...
    timer_setup(&ptr->my_timer, my_callback, 0);

Direct function assignments:

    void my_callback(unsigned long data)
    {
        struct something *ptr = (struct something *)data;
    ...
    }
    ...
    ptr->my_timer.function = my_callback;

have a temporary cast added, along with converting the args:

    void my_callback(struct timer_list *t)
    {
        struct something *ptr = from_timer(ptr, t, my_timer);
    ...
    }
    ...
    ptr->my_timer.function = (TIMER_FUNC_TYPE)my_callback;

And finally, callbacks without a data assignment:

    void my_callback(unsigned long data)
    {
    ...
    }
    ...
    setup_timer(&ptr->my_timer, my_callback, 0);

have their argument renamed to verify they're unused during conversion:

    void my_callback(struct timer_list *unused)
    {
    ...
    }
    ...
    timer_setup(&ptr->my_timer, my_callback, 0);

The conversion is done with the following Coccinelle script:

spatch --very-quiet --all-includes --include-headers \
	-I ./arch/x86/include -I ./arch/x86/include/generated \
	-I ./include -I ./arch/x86/include/uapi \
	-I ./arch/x86/include/generated/uapi -I ./include/uapi \
	-I ./include/generated/uapi --include ./include/linux/kconfig.h \
	--dir . \
	--cocci-file ~/src/data/timer_setup.cocci

@fix_address_of@
expression e;
@@

 setup_timer(
-&(e)
+&e
 , ...)

// Update any raw setup_timer() usages that have a NULL callback, but
// would otherwise match change_timer_function_usage, since the latter
// will update all function assignments done in the face of a NULL
// function initialization in setup_timer().
@change_timer_function_usage_NULL@
expression _E;
identifier _timer;
type _cast_data;
@@

(
-setup_timer(&_E->_timer, NULL, _E);
+timer_setup(&_E->_timer, NULL, 0);
|
-setup_timer(&_E->_timer, NULL, (_cast_data)_E);
+timer_setup(&_E->_timer, NULL, 0);
|
-setup_timer(&_E._timer, NULL, &_E);
+timer_setup(&_E._timer, NULL, 0);
|
-setup_timer(&_E._timer, NULL, (_cast_data)&_E);
+timer_setup(&_E._timer, NULL, 0);
)

@change_timer_function_usage@
expression _E;
identifier _timer;
struct timer_list _stl;
identifier _callback;
type _cast_func, _cast_data;
@@

(
-setup_timer(&_E->_timer, _callback, _E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, &_callback, _E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, _callback, (_cast_data)_E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, &_callback, (_cast_data)_E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, (_cast_func)_callback, _E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, (_cast_func)&_callback, _E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, (_cast_func)_callback, (_cast_data)_E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, (_cast_func)&_callback, (_cast_data)_E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E._timer, _callback, (_cast_data)_E);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, _callback, (_cast_data)&_E);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, &_callback, (_cast_data)_E);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, &_callback, (_cast_data)&_E);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, (_cast_func)_callback, (_cast_data)_E);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, (_cast_func)_callback, (_cast_data)&_E);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, (_cast_func)&_callback, (_cast_data)_E);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, (_cast_func)&_callback, (_cast_data)&_E);
+timer_setup(&_E._timer, _callback, 0);
|
 _E->_timer@_stl.function = _callback;
|
 _E->_timer@_stl.function = &_callback;
|
 _E->_timer@_stl.function = (_cast_func)_callback;
|
 _E->_timer@_stl.function = (_cast_func)&_callback;
|
 _E._timer@_stl.function = _callback;
|
 _E._timer@_stl.function = &_callback;
|
 _E._timer@_stl.function = (_cast_func)_callback;
|
 _E._timer@_stl.function = (_cast_func)&_callback;
)

// callback(unsigned long arg)
@change_callback_handle_cast
 depends on change_timer_function_usage@
identifier change_timer_function_usage._callback;
identifier change_timer_function_usage._timer;
type _origtype;
identifier _origarg;
type _handletype;
identifier _handle;
@@

 void _callback(
-_origtype _origarg
+struct timer_list *t
 )
 {
(
	... when != _origarg
	_handletype *_handle =
-(_handletype *)_origarg;
+from_timer(_handle, t, _timer);
	... when != _origarg
|
	... when != _origarg
	_handletype *_handle =
-(void *)_origarg;
+from_timer(_handle, t, _timer);
	... when != _origarg
|
	... when != _origarg
	_handletype *_handle;
	... when != _handle
	_handle =
-(_handletype *)_origarg;
+from_timer(_handle, t, _timer);
	... when != _origarg
|
	... when != _origarg
	_handletype *_handle;
	... when != _handle
	_handle =
-(void *)_origarg;
+from_timer(_handle, t, _timer);
	... when != _origarg
)
 }

// callback(unsigned long arg) without existing variable
@change_callback_handle_cast_no_arg
 depends on change_timer_function_usage &&
                     !change_callback_handle_cast@
identifier change_timer_function_usage._callback;
identifier change_timer_function_usage._timer;
type _origtype;
identifier _origarg;
type _handletype;
@@

 void _callback(
-_origtype _origarg
+struct timer_list *t
 )
 {
+	_handletype *_origarg = from_timer(_origarg, t, _timer);
+
	... when != _origarg
-	(_handletype *)_origarg
+	_origarg
	... when != _origarg
 }

// Avoid already converted callbacks.
@match_callback_converted
 depends on change_timer_function_usage &&
            !change_callback_handle_cast &&
	    !change_callback_handle_cast_no_arg@
identifier change_timer_function_usage._callback;
identifier t;
@@

 void _callback(struct timer_list *t)
 { ... }

// callback(struct something *handle)
@change_callback_handle_arg
 depends on change_timer_function_usage &&
	    !match_callback_converted &&
            !change_callback_handle_cast &&
            !change_callback_handle_cast_no_arg@
identifier change_timer_function_usage._callback;
identifier change_timer_function_usage._timer;
type _handletype;
identifier _handle;
@@

 void _callback(
-_handletype *_handle
+struct timer_list *t
 )
 {
+	_handletype *_handle = from_timer(_handle, t, _timer);
	...
 }

// If change_callback_handle_arg ran on an empty function, remove
// the added handler.
@unchange_callback_handle_arg
 depends on change_timer_function_usage &&
	    change_callback_handle_arg@
identifier change_timer_function_usage._callback;
identifier change_timer_function_usage._timer;
type _handletype;
identifier _handle;
identifier t;
@@

 void _callback(struct timer_list *t)
 {
-	_handletype *_handle = from_timer(_handle, t, _timer);
 }

// We only want to refactor the setup_timer() data argument if we've found
// the matching callback. This undoes changes in change_timer_function_usage.
@unchange_timer_function_usage
 depends on change_timer_function_usage &&
            !change_callback_handle_cast &&
            !change_callback_handle_cast_no_arg &&
	    !change_callback_handle_arg@
expression change_timer_function_usage._E;
identifier change_timer_function_usage._timer;
identifier change_timer_function_usage._callback;
type change_timer_function_usage._cast_data;
@@

(
-timer_setup(&_E->_timer, _callback, 0);
+setup_timer(&_E->_timer, _callback, (_cast_data)_E);
|
-timer_setup(&_E._timer, _callback, 0);
+setup_timer(&_E._timer, _callback, (_cast_data)&_E);
)

// If we fixed a callback from a .function assignment, fix the
// assignment cast now.
@change_timer_function_assignment
 depends on change_timer_function_usage &&
            (change_callback_handle_cast ||
             change_callback_handle_cast_no_arg ||
             change_callback_handle_arg)@
expression change_timer_function_usage._E;
identifier change_timer_function_usage._timer;
identifier change_timer_function_usage._callback;
type _cast_func;
typedef TIMER_FUNC_TYPE;
@@

(
 _E->_timer.function =
-_callback
+(TIMER_FUNC_TYPE)_callback
 ;
|
 _E->_timer.function =
-&_callback
+(TIMER_FUNC_TYPE)_callback
 ;
|
 _E->_timer.function =
-(_cast_func)_callback;
+(TIMER_FUNC_TYPE)_callback
 ;
|
 _E->_timer.function =
-(_cast_func)&_callback
+(TIMER_FUNC_TYPE)_callback
 ;
|
 _E._timer.function =
-_callback
+(TIMER_FUNC_TYPE)_callback
 ;
|
 _E._timer.function =
-&_callback;
+(TIMER_FUNC_TYPE)_callback
 ;
|
 _E._timer.function =
-(_cast_func)_callback
+(TIMER_FUNC_TYPE)_callback
 ;
|
 _E._timer.function =
-(_cast_func)&_callback
+(TIMER_FUNC_TYPE)_callback
 ;
)

// Sometimes timer functions are called directly. Replace matched args.
@change_timer_function_calls
 depends on change_timer_function_usage &&
            (change_callback_handle_cast ||
             change_callback_handle_cast_no_arg ||
             change_callback_handle_arg)@
expression _E;
identifier change_timer_function_usage._timer;
identifier change_timer_function_usage._callback;
type _cast_data;
@@

 _callback(
(
-(_cast_data)_E
+&_E->_timer
|
-(_cast_data)&_E
+&_E._timer
|
-_E
+&_E->_timer
)
 )

// If a timer has been configured without a data argument, it can be
// converted without regard to the callback argument, since it is unused.
@match_timer_function_unused_data@
expression _E;
identifier _timer;
identifier _callback;
@@

(
-setup_timer(&_E->_timer, _callback, 0);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, _callback, 0L);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, _callback, 0UL);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E._timer, _callback, 0);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, _callback, 0L);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, _callback, 0UL);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_timer, _callback, 0);
+timer_setup(&_timer, _callback, 0);
|
-setup_timer(&_timer, _callback, 0L);
+timer_setup(&_timer, _callback, 0);
|
-setup_timer(&_timer, _callback, 0UL);
+timer_setup(&_timer, _callback, 0);
|
-setup_timer(_timer, _callback, 0);
+timer_setup(_timer, _callback, 0);
|
-setup_timer(_timer, _callback, 0L);
+timer_setup(_timer, _callback, 0);
|
-setup_timer(_timer, _callback, 0UL);
+timer_setup(_timer, _callback, 0);
)

@change_callback_unused_data
 depends on match_timer_function_unused_data@
identifier match_timer_function_unused_data._callback;
type _origtype;
identifier _origarg;
@@

 void _callback(
-_origtype _origarg
+struct timer_list *unused
 )
 {
	... when != _origarg
 }

Signed-off-by: Kees Cook <keescook@chromium.org>
2017-11-21 15:57:07 -08:00

716 lines
19 KiB
C
Raw Blame History

/*
* Generic HDLC support routines for Linux
* Point-to-point protocol support
*
* Copyright (C) 1999 - 2008 Krzysztof Halasa <khc@pm.waw.pl>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License
* as published by the Free Software Foundation.
*/
#include <linux/errno.h>
#include <linux/hdlc.h>
#include <linux/if_arp.h>
#include <linux/inetdevice.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pkt_sched.h>
#include <linux/poll.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#define DEBUG_CP 0 /* also bytes# to dump */
#define DEBUG_STATE 0
#define DEBUG_HARD_HEADER 0
#define HDLC_ADDR_ALLSTATIONS 0xFF
#define HDLC_CTRL_UI 0x03
#define PID_LCP 0xC021
#define PID_IP 0x0021
#define PID_IPCP 0x8021
#define PID_IPV6 0x0057
#define PID_IPV6CP 0x8057
enum {IDX_LCP = 0, IDX_IPCP, IDX_IPV6CP, IDX_COUNT};
enum {CP_CONF_REQ = 1, CP_CONF_ACK, CP_CONF_NAK, CP_CONF_REJ, CP_TERM_REQ,
CP_TERM_ACK, CP_CODE_REJ, LCP_PROTO_REJ, LCP_ECHO_REQ, LCP_ECHO_REPLY,
LCP_DISC_REQ, CP_CODES};
#if DEBUG_CP
static const char *const code_names[CP_CODES] = {
"0", "ConfReq", "ConfAck", "ConfNak", "ConfRej", "TermReq",
"TermAck", "CodeRej", "ProtoRej", "EchoReq", "EchoReply", "Discard"
};
static char debug_buffer[64 + 3 * DEBUG_CP];
#endif
enum {LCP_OPTION_MRU = 1, LCP_OPTION_ACCM, LCP_OPTION_MAGIC = 5};
struct hdlc_header {
u8 address;
u8 control;
__be16 protocol;
};
struct cp_header {
u8 code;
u8 id;
__be16 len;
};
struct proto {
struct net_device *dev;
struct timer_list timer;
unsigned long timeout;
u16 pid; /* protocol ID */
u8 state;
u8 cr_id; /* ID of last Configuration-Request */
u8 restart_counter;
};
struct ppp {
struct proto protos[IDX_COUNT];
spinlock_t lock;
unsigned long last_pong;
unsigned int req_timeout, cr_retries, term_retries;
unsigned int keepalive_interval, keepalive_timeout;
u8 seq; /* local sequence number for requests */
u8 echo_id; /* ID of last Echo-Request (LCP) */
};
enum {CLOSED = 0, STOPPED, STOPPING, REQ_SENT, ACK_RECV, ACK_SENT, OPENED,
STATES, STATE_MASK = 0xF};
enum {START = 0, STOP, TO_GOOD, TO_BAD, RCR_GOOD, RCR_BAD, RCA, RCN, RTR, RTA,
RUC, RXJ_GOOD, RXJ_BAD, EVENTS};
enum {INV = 0x10, IRC = 0x20, ZRC = 0x40, SCR = 0x80, SCA = 0x100,
SCN = 0x200, STR = 0x400, STA = 0x800, SCJ = 0x1000};
#if DEBUG_STATE
static const char *const state_names[STATES] = {
"Closed", "Stopped", "Stopping", "ReqSent", "AckRecv", "AckSent",
"Opened"
};
static const char *const event_names[EVENTS] = {
"Start", "Stop", "TO+", "TO-", "RCR+", "RCR-", "RCA", "RCN",
"RTR", "RTA", "RUC", "RXJ+", "RXJ-"
};
#endif
static struct sk_buff_head tx_queue; /* used when holding the spin lock */
static int ppp_ioctl(struct net_device *dev, struct ifreq *ifr);
static inline struct ppp* get_ppp(struct net_device *dev)
{
return (struct ppp *)dev_to_hdlc(dev)->state;
}
static inline struct proto* get_proto(struct net_device *dev, u16 pid)
{
struct ppp *ppp = get_ppp(dev);
switch (pid) {
case PID_LCP:
return &ppp->protos[IDX_LCP];
case PID_IPCP:
return &ppp->protos[IDX_IPCP];
case PID_IPV6CP:
return &ppp->protos[IDX_IPV6CP];
default:
return NULL;
}
}
static inline const char* proto_name(u16 pid)
{
switch (pid) {
case PID_LCP:
return "LCP";
case PID_IPCP:
return "IPCP";
case PID_IPV6CP:
return "IPV6CP";
default:
return NULL;
}
}
static __be16 ppp_type_trans(struct sk_buff *skb, struct net_device *dev)
{
struct hdlc_header *data = (struct hdlc_header*)skb->data;
if (skb->len < sizeof(struct hdlc_header))
return htons(ETH_P_HDLC);
if (data->address != HDLC_ADDR_ALLSTATIONS ||
data->control != HDLC_CTRL_UI)
return htons(ETH_P_HDLC);
switch (data->protocol) {
case cpu_to_be16(PID_IP):
skb_pull(skb, sizeof(struct hdlc_header));
return htons(ETH_P_IP);
case cpu_to_be16(PID_IPV6):
skb_pull(skb, sizeof(struct hdlc_header));
return htons(ETH_P_IPV6);
default:
return htons(ETH_P_HDLC);
}
}
static int ppp_hard_header(struct sk_buff *skb, struct net_device *dev,
u16 type, const void *daddr, const void *saddr,
unsigned int len)
{
struct hdlc_header *data;
#if DEBUG_HARD_HEADER
printk(KERN_DEBUG "%s: ppp_hard_header() called\n", dev->name);
#endif
skb_push(skb, sizeof(struct hdlc_header));
data = (struct hdlc_header*)skb->data;
data->address = HDLC_ADDR_ALLSTATIONS;
data->control = HDLC_CTRL_UI;
switch (type) {
case ETH_P_IP:
data->protocol = htons(PID_IP);
break;
case ETH_P_IPV6:
data->protocol = htons(PID_IPV6);
break;
case PID_LCP:
case PID_IPCP:
case PID_IPV6CP:
data->protocol = htons(type);
break;
default: /* unknown protocol */
data->protocol = 0;
}
return sizeof(struct hdlc_header);
}
static void ppp_tx_flush(void)
{
struct sk_buff *skb;
while ((skb = skb_dequeue(&tx_queue)) != NULL)
dev_queue_xmit(skb);
}
static void ppp_tx_cp(struct net_device *dev, u16 pid, u8 code,
u8 id, unsigned int len, const void *data)
{
struct sk_buff *skb;
struct cp_header *cp;
unsigned int magic_len = 0;
static u32 magic;
#if DEBUG_CP
int i;
char *ptr;
#endif
if (pid == PID_LCP && (code == LCP_ECHO_REQ || code == LCP_ECHO_REPLY))
magic_len = sizeof(magic);
skb = dev_alloc_skb(sizeof(struct hdlc_header) +
sizeof(struct cp_header) + magic_len + len);
if (!skb) {
netdev_warn(dev, "out of memory in ppp_tx_cp()\n");
return;
}
skb_reserve(skb, sizeof(struct hdlc_header));
cp = skb_put(skb, sizeof(struct cp_header));
cp->code = code;
cp->id = id;
cp->len = htons(sizeof(struct cp_header) + magic_len + len);
if (magic_len)
skb_put_data(skb, &magic, magic_len);
if (len)
skb_put_data(skb, data, len);
#if DEBUG_CP
BUG_ON(code >= CP_CODES);
ptr = debug_buffer;
*ptr = '\x0';
for (i = 0; i < min_t(unsigned int, magic_len + len, DEBUG_CP); i++) {
sprintf(ptr, " %02X", skb->data[sizeof(struct cp_header) + i]);
ptr += strlen(ptr);
}
printk(KERN_DEBUG "%s: TX %s [%s id 0x%X]%s\n", dev->name,
proto_name(pid), code_names[code], id, debug_buffer);
#endif
ppp_hard_header(skb, dev, pid, NULL, NULL, 0);
skb->priority = TC_PRIO_CONTROL;
skb->dev = dev;
skb_reset_network_header(skb);
skb_queue_tail(&tx_queue, skb);
}
/* State transition table (compare STD-51)
Events Actions
TO+ = Timeout with counter > 0 irc = Initialize-Restart-Count
TO- = Timeout with counter expired zrc = Zero-Restart-Count
RCR+ = Receive-Configure-Request (Good) scr = Send-Configure-Request
RCR- = Receive-Configure-Request (Bad)
RCA = Receive-Configure-Ack sca = Send-Configure-Ack
RCN = Receive-Configure-Nak/Rej scn = Send-Configure-Nak/Rej
RTR = Receive-Terminate-Request str = Send-Terminate-Request
RTA = Receive-Terminate-Ack sta = Send-Terminate-Ack
RUC = Receive-Unknown-Code scj = Send-Code-Reject
RXJ+ = Receive-Code-Reject (permitted)
or Receive-Protocol-Reject
RXJ- = Receive-Code-Reject (catastrophic)
or Receive-Protocol-Reject
*/
static int cp_table[EVENTS][STATES] = {
/* CLOSED STOPPED STOPPING REQ_SENT ACK_RECV ACK_SENT OPENED
0 1 2 3 4 5 6 */
{IRC|SCR|3, INV , INV , INV , INV , INV , INV }, /* START */
{ INV , 0 , 0 , 0 , 0 , 0 , 0 }, /* STOP */
{ INV , INV ,STR|2, SCR|3 ,SCR|3, SCR|5 , INV }, /* TO+ */
{ INV , INV , 1 , 1 , 1 , 1 , INV }, /* TO- */
{ STA|0 ,IRC|SCR|SCA|5, 2 , SCA|5 ,SCA|6, SCA|5 ,SCR|SCA|5}, /* RCR+ */
{ STA|0 ,IRC|SCR|SCN|3, 2 , SCN|3 ,SCN|4, SCN|3 ,SCR|SCN|3}, /* RCR- */
{ STA|0 , STA|1 , 2 , IRC|4 ,SCR|3, 6 , SCR|3 }, /* RCA */
{ STA|0 , STA|1 , 2 ,IRC|SCR|3,SCR|3,IRC|SCR|5, SCR|3 }, /* RCN */
{ STA|0 , STA|1 ,STA|2, STA|3 ,STA|3, STA|3 ,ZRC|STA|2}, /* RTR */
{ 0 , 1 , 1 , 3 , 3 , 5 , SCR|3 }, /* RTA */
{ SCJ|0 , SCJ|1 ,SCJ|2, SCJ|3 ,SCJ|4, SCJ|5 , SCJ|6 }, /* RUC */
{ 0 , 1 , 2 , 3 , 3 , 5 , 6 }, /* RXJ+ */
{ 0 , 1 , 1 , 1 , 1 , 1 ,IRC|STR|2}, /* RXJ- */
};
/* SCA: RCR+ must supply id, len and data
SCN: RCR- must supply code, id, len and data
STA: RTR must supply id
SCJ: RUC must supply CP packet len and data */
static void ppp_cp_event(struct net_device *dev, u16 pid, u16 event, u8 code,
u8 id, unsigned int len, const void *data)
{
int old_state, action;
struct ppp *ppp = get_ppp(dev);
struct proto *proto = get_proto(dev, pid);
old_state = proto->state;
BUG_ON(old_state >= STATES);
BUG_ON(event >= EVENTS);
#if DEBUG_STATE
printk(KERN_DEBUG "%s: %s ppp_cp_event(%s) %s ...\n", dev->name,
proto_name(pid), event_names[event], state_names[proto->state]);
#endif
action = cp_table[event][old_state];
proto->state = action & STATE_MASK;
if (action & (SCR | STR)) /* set Configure-Req/Terminate-Req timer */
mod_timer(&proto->timer, proto->timeout =
jiffies + ppp->req_timeout * HZ);
if (action & ZRC)
proto->restart_counter = 0;
if (action & IRC)
proto->restart_counter = (proto->state == STOPPING) ?
ppp->term_retries : ppp->cr_retries;
if (action & SCR) /* send Configure-Request */
ppp_tx_cp(dev, pid, CP_CONF_REQ, proto->cr_id = ++ppp->seq,
0, NULL);
if (action & SCA) /* send Configure-Ack */
ppp_tx_cp(dev, pid, CP_CONF_ACK, id, len, data);
if (action & SCN) /* send Configure-Nak/Reject */
ppp_tx_cp(dev, pid, code, id, len, data);
if (action & STR) /* send Terminate-Request */
ppp_tx_cp(dev, pid, CP_TERM_REQ, ++ppp->seq, 0, NULL);
if (action & STA) /* send Terminate-Ack */
ppp_tx_cp(dev, pid, CP_TERM_ACK, id, 0, NULL);
if (action & SCJ) /* send Code-Reject */
ppp_tx_cp(dev, pid, CP_CODE_REJ, ++ppp->seq, len, data);
if (old_state != OPENED && proto->state == OPENED) {
netdev_info(dev, "%s up\n", proto_name(pid));
if (pid == PID_LCP) {
netif_dormant_off(dev);
ppp_cp_event(dev, PID_IPCP, START, 0, 0, 0, NULL);
ppp_cp_event(dev, PID_IPV6CP, START, 0, 0, 0, NULL);
ppp->last_pong = jiffies;
mod_timer(&proto->timer, proto->timeout =
jiffies + ppp->keepalive_interval * HZ);
}
}
if (old_state == OPENED && proto->state != OPENED) {
netdev_info(dev, "%s down\n", proto_name(pid));
if (pid == PID_LCP) {
netif_dormant_on(dev);
ppp_cp_event(dev, PID_IPCP, STOP, 0, 0, 0, NULL);
ppp_cp_event(dev, PID_IPV6CP, STOP, 0, 0, 0, NULL);
}
}
if (old_state != CLOSED && proto->state == CLOSED)
del_timer(&proto->timer);
#if DEBUG_STATE
printk(KERN_DEBUG "%s: %s ppp_cp_event(%s) ... %s\n", dev->name,
proto_name(pid), event_names[event], state_names[proto->state]);
#endif
}
static void ppp_cp_parse_cr(struct net_device *dev, u16 pid, u8 id,
unsigned int req_len, const u8 *data)
{
static u8 const valid_accm[6] = { LCP_OPTION_ACCM, 6, 0, 0, 0, 0 };
const u8 *opt;
u8 *out;
unsigned int len = req_len, nak_len = 0, rej_len = 0;
if (!(out = kmalloc(len, GFP_ATOMIC))) {
dev->stats.rx_dropped++;
return; /* out of memory, ignore CR packet */
}
for (opt = data; len; len -= opt[1], opt += opt[1]) {
if (len < 2 || len < opt[1]) {
dev->stats.rx_errors++;
kfree(out);
return; /* bad packet, drop silently */
}
if (pid == PID_LCP)
switch (opt[0]) {
case LCP_OPTION_MRU:
continue; /* MRU always OK and > 1500 bytes? */
case LCP_OPTION_ACCM: /* async control character map */
if (!memcmp(opt, valid_accm,
sizeof(valid_accm)))
continue;
if (!rej_len) { /* NAK it */
memcpy(out + nak_len, valid_accm,
sizeof(valid_accm));
nak_len += sizeof(valid_accm);
continue;
}
break;
case LCP_OPTION_MAGIC:
if (opt[1] != 6 || (!opt[2] && !opt[3] &&
!opt[4] && !opt[5]))
break; /* reject invalid magic number */
continue;
}
/* reject this option */
memcpy(out + rej_len, opt, opt[1]);
rej_len += opt[1];
}
if (rej_len)
ppp_cp_event(dev, pid, RCR_BAD, CP_CONF_REJ, id, rej_len, out);
else if (nak_len)
ppp_cp_event(dev, pid, RCR_BAD, CP_CONF_NAK, id, nak_len, out);
else
ppp_cp_event(dev, pid, RCR_GOOD, CP_CONF_ACK, id, req_len, data);
kfree(out);
}
static int ppp_rx(struct sk_buff *skb)
{
struct hdlc_header *hdr = (struct hdlc_header*)skb->data;
struct net_device *dev = skb->dev;
struct ppp *ppp = get_ppp(dev);
struct proto *proto;
struct cp_header *cp;
unsigned long flags;
unsigned int len;
u16 pid;
#if DEBUG_CP
int i;
char *ptr;
#endif
spin_lock_irqsave(&ppp->lock, flags);
/* Check HDLC header */
if (skb->len < sizeof(struct hdlc_header))
goto rx_error;
cp = skb_pull(skb, sizeof(struct hdlc_header));
if (hdr->address != HDLC_ADDR_ALLSTATIONS ||
hdr->control != HDLC_CTRL_UI)
goto rx_error;
pid = ntohs(hdr->protocol);
proto = get_proto(dev, pid);
if (!proto) {
if (ppp->protos[IDX_LCP].state == OPENED)
ppp_tx_cp(dev, PID_LCP, LCP_PROTO_REJ,
++ppp->seq, skb->len + 2, &hdr->protocol);
goto rx_error;
}
len = ntohs(cp->len);
if (len < sizeof(struct cp_header) /* no complete CP header? */ ||
skb->len < len /* truncated packet? */)
goto rx_error;
skb_pull(skb, sizeof(struct cp_header));
len -= sizeof(struct cp_header);
/* HDLC and CP headers stripped from skb */
#if DEBUG_CP
if (cp->code < CP_CODES)
sprintf(debug_buffer, "[%s id 0x%X]", code_names[cp->code],
cp->id);
else
sprintf(debug_buffer, "[code %u id 0x%X]", cp->code, cp->id);
ptr = debug_buffer + strlen(debug_buffer);
for (i = 0; i < min_t(unsigned int, len, DEBUG_CP); i++) {
sprintf(ptr, " %02X", skb->data[i]);
ptr += strlen(ptr);
}
printk(KERN_DEBUG "%s: RX %s %s\n", dev->name, proto_name(pid),
debug_buffer);
#endif
/* LCP only */
if (pid == PID_LCP)
switch (cp->code) {
case LCP_PROTO_REJ:
pid = ntohs(*(__be16*)skb->data);
if (pid == PID_LCP || pid == PID_IPCP ||
pid == PID_IPV6CP)
ppp_cp_event(dev, pid, RXJ_BAD, 0, 0,
0, NULL);
goto out;
case LCP_ECHO_REQ: /* send Echo-Reply */
if (len >= 4 && proto->state == OPENED)
ppp_tx_cp(dev, PID_LCP, LCP_ECHO_REPLY,
cp->id, len - 4, skb->data + 4);
goto out;
case LCP_ECHO_REPLY:
if (cp->id == ppp->echo_id)
ppp->last_pong = jiffies;
goto out;
case LCP_DISC_REQ: /* discard */
goto out;
}
/* LCP, IPCP and IPV6CP */
switch (cp->code) {
case CP_CONF_REQ:
ppp_cp_parse_cr(dev, pid, cp->id, len, skb->data);
break;
case CP_CONF_ACK:
if (cp->id == proto->cr_id)
ppp_cp_event(dev, pid, RCA, 0, 0, 0, NULL);
break;
case CP_CONF_REJ:
case CP_CONF_NAK:
if (cp->id == proto->cr_id)
ppp_cp_event(dev, pid, RCN, 0, 0, 0, NULL);
break;
case CP_TERM_REQ:
ppp_cp_event(dev, pid, RTR, 0, cp->id, 0, NULL);
break;
case CP_TERM_ACK:
ppp_cp_event(dev, pid, RTA, 0, 0, 0, NULL);
break;
case CP_CODE_REJ:
ppp_cp_event(dev, pid, RXJ_BAD, 0, 0, 0, NULL);
break;
default:
len += sizeof(struct cp_header);
if (len > dev->mtu)
len = dev->mtu;
ppp_cp_event(dev, pid, RUC, 0, 0, len, cp);
break;
}
goto out;
rx_error:
dev->stats.rx_errors++;
out:
spin_unlock_irqrestore(&ppp->lock, flags);
dev_kfree_skb_any(skb);
ppp_tx_flush();
return NET_RX_DROP;
}
static void ppp_timer(struct timer_list *t)
{
struct proto *proto = from_timer(proto, t, timer);
struct ppp *ppp = get_ppp(proto->dev);
unsigned long flags;
spin_lock_irqsave(&ppp->lock, flags);
switch (proto->state) {
case STOPPING:
case REQ_SENT:
case ACK_RECV:
case ACK_SENT:
if (proto->restart_counter) {
ppp_cp_event(proto->dev, proto->pid, TO_GOOD, 0, 0,
0, NULL);
proto->restart_counter--;
} else
ppp_cp_event(proto->dev, proto->pid, TO_BAD, 0, 0,
0, NULL);
break;
case OPENED:
if (proto->pid != PID_LCP)
break;
if (time_after(jiffies, ppp->last_pong +
ppp->keepalive_timeout * HZ)) {
netdev_info(proto->dev, "Link down\n");
ppp_cp_event(proto->dev, PID_LCP, STOP, 0, 0, 0, NULL);
ppp_cp_event(proto->dev, PID_LCP, START, 0, 0, 0, NULL);
} else { /* send keep-alive packet */
ppp->echo_id = ++ppp->seq;
ppp_tx_cp(proto->dev, PID_LCP, LCP_ECHO_REQ,
ppp->echo_id, 0, NULL);
proto->timer.expires = jiffies +
ppp->keepalive_interval * HZ;
add_timer(&proto->timer);
}
break;
}
spin_unlock_irqrestore(&ppp->lock, flags);
ppp_tx_flush();
}
static void ppp_start(struct net_device *dev)
{
struct ppp *ppp = get_ppp(dev);
int i;
for (i = 0; i < IDX_COUNT; i++) {
struct proto *proto = &ppp->protos[i];
proto->dev = dev;
timer_setup(&proto->timer, ppp_timer, 0);
proto->state = CLOSED;
}
ppp->protos[IDX_LCP].pid = PID_LCP;
ppp->protos[IDX_IPCP].pid = PID_IPCP;
ppp->protos[IDX_IPV6CP].pid = PID_IPV6CP;
ppp_cp_event(dev, PID_LCP, START, 0, 0, 0, NULL);
}
static void ppp_stop(struct net_device *dev)
{
ppp_cp_event(dev, PID_LCP, STOP, 0, 0, 0, NULL);
}
static void ppp_close(struct net_device *dev)
{
ppp_tx_flush();
}
static struct hdlc_proto proto = {
.start = ppp_start,
.stop = ppp_stop,
.close = ppp_close,
.type_trans = ppp_type_trans,
.ioctl = ppp_ioctl,
.netif_rx = ppp_rx,
.module = THIS_MODULE,
};
static const struct header_ops ppp_header_ops = {
.create = ppp_hard_header,
};
static int ppp_ioctl(struct net_device *dev, struct ifreq *ifr)
{
hdlc_device *hdlc = dev_to_hdlc(dev);
struct ppp *ppp;
int result;
switch (ifr->ifr_settings.type) {
case IF_GET_PROTO:
if (dev_to_hdlc(dev)->proto != &proto)
return -EINVAL;
ifr->ifr_settings.type = IF_PROTO_PPP;
return 0; /* return protocol only, no settable parameters */
case IF_PROTO_PPP:
if (!capable(CAP_NET_ADMIN))
return -EPERM;
if (dev->flags & IFF_UP)
return -EBUSY;
/* no settable parameters */
result = hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
if (result)
return result;
result = attach_hdlc_protocol(dev, &proto, sizeof(struct ppp));
if (result)
return result;
ppp = get_ppp(dev);
spin_lock_init(&ppp->lock);
ppp->req_timeout = 2;
ppp->cr_retries = 10;
ppp->term_retries = 2;
ppp->keepalive_interval = 10;
ppp->keepalive_timeout = 60;
dev->hard_header_len = sizeof(struct hdlc_header);
dev->header_ops = &ppp_header_ops;
dev->type = ARPHRD_PPP;
call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);
netif_dormant_on(dev);
return 0;
}
return -EINVAL;
}
static int __init mod_init(void)
{
skb_queue_head_init(&tx_queue);
register_hdlc_protocol(&proto);
return 0;
}
static void __exit mod_exit(void)
{
unregister_hdlc_protocol(&proto);
}
module_init(mod_init);
module_exit(mod_exit);
MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
MODULE_DESCRIPTION("PPP protocol support for generic HDLC");
MODULE_LICENSE("GPL v2");
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