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[DECNET] address: Calculate accurate message size for netlink notifications

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Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Graf 2006-11-24 17:14:07 -08:00 committed by David S. Miller
parent 107a5fe619
commit a6f01cace3
1 changed files with 12 additions and 7 deletions
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19
net/decnet/dn_dev.c
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@ -38,7 +38,6 @@
#include <linux/if_arp.h>
#include <linux/if_ether.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include <linux/sysctl.h>
#include <linux/notifier.h>
#include <asm/uaccess.h>
@ -47,6 +46,7 @@
#include <net/dst.h>
#include <net/flow.h>
#include <net/fib_rules.h>
#include <net/netlink.h>
#include <net/dn.h>
#include <net/dn_dev.h>
#include <net/dn_route.h>
@ -711,6 +711,14 @@ static int dn_dev_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *a
return rv;
}
static inline size_t dn_ifaddr_nlmsg_size(void)
{
return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
+ nla_total_size(IFNAMSIZ) /* IFA_LABEL */
+ nla_total_size(2) /* IFA_ADDRESS */
+ nla_total_size(2); /* IFA_LOCAL */
}
static int dn_dev_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
u32 pid, u32 seq, int event, unsigned int flags)
{
@ -744,18 +752,15 @@ rtattr_failure:
static void rtmsg_ifa(int event, struct dn_ifaddr *ifa)
{
struct sk_buff *skb;
int payload = sizeof(struct ifaddrmsg) + 128;
int err = -ENOBUFS;
skb = alloc_skb(nlmsg_total_size(payload), GFP_KERNEL);
skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
if (skb == NULL)
goto errout;
err = dn_dev_fill_ifaddr(skb, ifa, 0, 0, event, 0);
if (err < 0) {
kfree_skb(skb);
goto errout;
}
/* failure implies BUG in dn_ifaddr_nlmsg_size() */
BUG_ON(err < 0);
err = rtnl_notify(skb, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
errout: