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[IPV6] SNMP: Use put_unaligned() instead of memcpy(). 

Hint from David Miller <davem@davemloft.net>.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
YOSHIFUJI Hideaki 2007-04-21 19:52:04 -07:00 committed by David S. Miller
parent 952a10be32
commit 97fc8d0bc5
2 changed files with 11 additions and 17 deletions
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2
include/net/ipv6.h
View File

@ -172,7 +172,7 @@ int snmp6_alloc_dev(struct inet6_dev *idev);
int snmp6_free_dev(struct inet6_dev *idev);
int snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign);
void snmp6_mib_free(void *ptr[2]);
void snmp6_fill_stats(void *stats, struct inet6_dev *idev, int attrtype, int bytes);
void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, int bytes);
struct ip6_ra_chain
{

26
net/ipv6/proc.c
View File

@ -23,6 +23,7 @@
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/stddef.h>
#include <asm/unaligned.h>
#include <net/sock.h>
#include <net/tcp.h>
#include <net/transp_v6.h>
@ -210,30 +211,23 @@ static const struct file_operations snmp6_seq_fops = {
};
#endif /* CONFIG_PROC_FS */
/*
* Stats may not be aligned for u64, so use memcpy to avoid
* unaligned accesses.
*/
static inline void __set_u64(void *p, u64 v)
{
memcpy(p, &v, sizeof(u64));
}
static inline void
__snmp6_fill_stats(void *stats, void **mib, int items, int bytes)
__snmp6_fill_stats(u64 *stats, void **mib, int items, int bytes)
{
int i;
u8 *p = stats;
int pad = bytes - sizeof(u64) * items;
BUG_ON(pad < 0);
__set_u64(p, items);
for (i = 1, p += sizeof(u64); i < items; i++, p += sizeof(u64))
__set_u64(p, fold_field(mib, i));
memset(p, 0, pad);
/* Use put_unaligned() because stats may not be aligned for u64. */
put_unaligned(items, &stats[0]);
for (i = 1; i < items; i++)
put_unaligned(fold_field(mib, i), &stats[i]);
memset(&stats[items], 0, pad);
}
void
snmp6_fill_stats(void *stats, struct inet6_dev *idev, int attrtype, int bytes)
snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, int bytes)
{
switch(attrtype) {
case IFLA_INET6_STATS: