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wext: Emit event stream entries correctly when compat.

Browse source 
Three major portions to this change:

1) Add IW_EV_COMPAT_LCP_LEN, IW_EV_COMPAT_POINT_OFF,
   and IW_EV_COMPAT_POINT_LEN helper defines.

2) Delete iw_stream_check_add_*(), they are unused.

3) Add iw_request_info argument to iwe_stream_add_*(), and use it to
   size the event and pointer lengths correctly depending upon whether
   IW_REQUEST_FLAG_COMPAT is set or not.

4) The mechanical transformations to the drivers and wireless stack
   bits to get the iw_request_info passed down into the routines
   modified in #3.  Also, explicit references to IW_EV_LCP_LEN are
   replaced with iwe_stream_lcp_len(info).

With a lot of help and bug fixes from Masakazu Mokuno.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2008-06-16 18:50:49 -07:00
parent 0f5cabba49
commit ccc580571c
18 changed files with 351 additions and 314 deletions
Download patch file Download diff file Expand all files Collapse all files

161
include/net/iw_handler.h
View file

@ -478,24 +478,56 @@ extern void wireless_spy_update(struct net_device * dev,
* Function that are so simple that it's more efficient inlining them
*/
static inline int iwe_stream_lcp_len(struct iw_request_info *info)
{
#ifdef CONFIG_COMPAT
if (info->flags & IW_REQUEST_FLAG_COMPAT)
return IW_EV_COMPAT_LCP_LEN;
#endif
return IW_EV_LCP_LEN;
}
static inline int iwe_stream_point_len(struct iw_request_info *info)
{
#ifdef CONFIG_COMPAT
if (info->flags & IW_REQUEST_FLAG_COMPAT)
return IW_EV_COMPAT_POINT_LEN;
#endif
return IW_EV_POINT_LEN;
}
static inline int iwe_stream_event_len_adjust(struct iw_request_info *info,
int event_len)
{
#ifdef CONFIG_COMPAT
if (info->flags & IW_REQUEST_FLAG_COMPAT) {
event_len -= IW_EV_LCP_LEN;
event_len += IW_EV_COMPAT_LCP_LEN;
}
#endif
return event_len;
}
/*------------------------------------------------------------------*/
/*
* Wrapper to add an Wireless Event to a stream of events.
*/
static inline char *
iwe_stream_add_event(char * stream, /* Stream of events */
char * ends, /* End of stream */
struct iw_event *iwe, /* Payload */
int event_len) /* Real size of payload */
iwe_stream_add_event(struct iw_request_info *info, char *stream, char *ends,
struct iw_event *iwe, int event_len)
{
int lcp_len = iwe_stream_lcp_len(info);
event_len = iwe_stream_event_len_adjust(info, event_len);
/* Check if it's possible */
if(likely((stream + event_len) < ends)) {
iwe->len = event_len;
/* Beware of alignement issues on 64 bits */
memcpy(stream, (char *) iwe, IW_EV_LCP_PK_LEN);
memcpy(stream + IW_EV_LCP_LEN,
((char *) iwe) + IW_EV_LCP_LEN,
event_len - IW_EV_LCP_LEN);
memcpy(stream + lcp_len, &iwe->u,
event_len - lcp_len);
stream += event_len;
}
return stream;
@ -507,20 +539,21 @@ iwe_stream_add_event(char * stream, /* Stream of events */
* stream of events.
*/
static inline char *
iwe_stream_add_point(char * stream, /* Stream of events */
char * ends, /* End of stream */
struct iw_event *iwe, /* Payload length + flags */
char * extra) /* More payload */
iwe_stream_add_point(struct iw_request_info *info, char *stream, char *ends,
struct iw_event *iwe, char *extra)
{
int event_len = IW_EV_POINT_LEN + iwe->u.data.length;
int event_len = iwe_stream_point_len(info) + iwe->u.data.length;
int point_len = iwe_stream_point_len(info);
int lcp_len = iwe_stream_lcp_len(info);
/* Check if it's possible */
if(likely((stream + event_len) < ends)) {
iwe->len = event_len;
memcpy(stream, (char *) iwe, IW_EV_LCP_PK_LEN);
memcpy(stream + IW_EV_LCP_LEN,
((char *) iwe) + IW_EV_LCP_LEN + IW_EV_POINT_OFF,
memcpy(stream + lcp_len,
((char *) &iwe->u) + IW_EV_POINT_OFF,
IW_EV_POINT_PK_LEN - IW_EV_LCP_PK_LEN);
memcpy(stream + IW_EV_POINT_LEN, extra, iwe->u.data.length);
memcpy(stream + point_len, extra, iwe->u.data.length);
stream += event_len;
}
return stream;
@ -533,110 +566,24 @@ iwe_stream_add_point(char * stream, /* Stream of events */
* At the first run, you need to have (value = event + IW_EV_LCP_LEN).
*/
static inline char *
iwe_stream_add_value(char * event, /* Event in the stream */
char * value, /* Value in event */
char * ends, /* End of stream */
struct iw_event *iwe, /* Payload */
int event_len) /* Real size of payload */
iwe_stream_add_value(struct iw_request_info *info, char *event, char *value,
char *ends, struct iw_event *iwe, int event_len)
{
int lcp_len = iwe_stream_lcp_len(info);
/* Don't duplicate LCP */
event_len -= IW_EV_LCP_LEN;
/* Check if it's possible */
if(likely((value + event_len) < ends)) {
/* Add new value */
memcpy(value, (char *) iwe + IW_EV_LCP_LEN, event_len);
memcpy(value, &iwe->u, event_len);
value += event_len;
/* Patch LCP */
iwe->len = value - event;
memcpy(event, (char *) iwe, IW_EV_LCP_LEN);
memcpy(event, (char *) iwe, lcp_len);
}
return value;
}
/*------------------------------------------------------------------*/
/*
* Wrapper to add an Wireless Event to a stream of events.
* Same as above, with explicit error check...
*/
static inline char *
iwe_stream_check_add_event(char * stream, /* Stream of events */
char * ends, /* End of stream */
struct iw_event *iwe, /* Payload */
int event_len, /* Size of payload */
int * perr) /* Error report */
{
/* Check if it's possible, set error if not */
if(likely((stream + event_len) < ends)) {
iwe->len = event_len;
/* Beware of alignement issues on 64 bits */
memcpy(stream, (char *) iwe, IW_EV_LCP_PK_LEN);
memcpy(stream + IW_EV_LCP_LEN,
((char *) iwe) + IW_EV_LCP_LEN,
event_len - IW_EV_LCP_LEN);
stream += event_len;
} else
*perr = -E2BIG;
return stream;
}
/*------------------------------------------------------------------*/
/*
* Wrapper to add an short Wireless Event containing a pointer to a
* stream of events.
* Same as above, with explicit error check...
*/
static inline char *
iwe_stream_check_add_point(char * stream, /* Stream of events */
char * ends, /* End of stream */
struct iw_event *iwe, /* Payload length + flags */
char * extra, /* More payload */
int * perr) /* Error report */
{
int event_len = IW_EV_POINT_LEN + iwe->u.data.length;
/* Check if it's possible */
if(likely((stream + event_len) < ends)) {
iwe->len = event_len;
memcpy(stream, (char *) iwe, IW_EV_LCP_PK_LEN);
memcpy(stream + IW_EV_LCP_LEN,
((char *) iwe) + IW_EV_LCP_LEN + IW_EV_POINT_OFF,
IW_EV_POINT_PK_LEN - IW_EV_LCP_PK_LEN);
memcpy(stream + IW_EV_POINT_LEN, extra, iwe->u.data.length);
stream += event_len;
} else
*perr = -E2BIG;
return stream;
}
/*------------------------------------------------------------------*/
/*
* Wrapper to add a value to a Wireless Event in a stream of events.
* Be careful, this one is tricky to use properly :
* At the first run, you need to have (value = event + IW_EV_LCP_LEN).
* Same as above, with explicit error check...
*/
static inline char *
iwe_stream_check_add_value(char * event, /* Event in the stream */
char * value, /* Value in event */
char * ends, /* End of stream */
struct iw_event *iwe, /* Payload */
int event_len, /* Size of payload */
int * perr) /* Error report */
{
/* Don't duplicate LCP */
event_len -= IW_EV_LCP_LEN;
/* Check if it's possible */
if(likely((value + event_len) < ends)) {
/* Add new value */
memcpy(value, (char *) iwe + IW_EV_LCP_LEN, event_len);
value += event_len;
/* Patch LCP */
iwe->len = value - event;
memcpy(event, (char *) iwe, IW_EV_LCP_LEN);
} else
*perr = -E2BIG;
return value;
}
#endif /* _IW_HANDLER_H */