diff options
| author | Thomas Graf | 2006-11-24 17:14:07 -0800 |
|---|---|---|
| committer | David S. Miller | 2006-12-02 21:30:28 -0800 |
| commit | a6f01cace3a6532c6f22d8e2fdefed3632ea61b2 (patch) | |
| tree | a9c72ecb3388549c82b9a108ad7eb10fad847f8a /net/decnet | |
| parent | 107a5fe6191249878de0de42bb64d3c35be1a986 (diff) | |
[DECNET] address: Calculate accurate message size for netlink notifications
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/decnet')
| -rw-r--r-- | net/decnet/dn_dev.c | 19 |
1 files changed, 12 insertions, 7 deletions
diff --git a/net/decnet/dn_dev.c b/net/decnet/dn_dev.c index 5b451e196fb9..2459a8d236a0 100644 --- a/net/decnet/dn_dev.c +++ b/net/decnet/dn_dev.c @@ -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: |