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authorPavel Emelyanov <xemul@parallels.com>2011-12-09 06:21:53 +0000
committerDavid S. Miller <davem@davemloft.net>2011-12-09 14:14:08 -0500
commitb005ab4ef8805dc4604848c9d2ccca9d71f8fc46 (patch)
treec0a057c74dae2fbcc3118a69b0ca3ed5504d3029 /net/ipv4/inet_diag.c
parent87c22ea52e1bb467f58b3e9a71509fccb70c7bd3 (diff)
downloadlinux-b005ab4ef8805dc4604848c9d2ccca9d71f8fc46.tar.bz2
inet_diag: Export inet diag cookie checking routine
The netlink diag susbsys stores sk address bits in the nl message as a "cookie" and uses one when dumps details about particular socket. The same will be required for udp diag module, so introduce a heler in inet_diag module Signed-off-by: Pavel Emelyanov <xemul@parallels.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/inet_diag.c')
-rw-r--r--net/ipv4/inet_diag.c19
1 files changed, 14 insertions, 5 deletions
diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index bd3f661803a7..ba3ae1f73abf 100644
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -246,6 +246,18 @@ static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
return inet_csk_diag_fill(sk, skb, r, pid, seq, nlmsg_flags, unlh);
}
+int inet_diag_check_cookie(struct sock *sk, struct inet_diag_req *req)
+{
+ if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
+ req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
+ ((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
+ (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
+ return -ESTALE;
+ else
+ return 0;
+}
+EXPORT_SYMBOL_GPL(inet_diag_check_cookie);
+
static int inet_diag_get_exact(struct sk_buff *in_skb,
const struct nlmsghdr *nlh,
struct inet_diag_req *req)
@@ -288,11 +300,8 @@ static int inet_diag_get_exact(struct sk_buff *in_skb,
if (sk == NULL)
goto unlock;
- err = -ESTALE;
- if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
- req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
- ((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
- (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
+ err = inet_diag_check_cookie(sk, req);
+ if (err)
goto out;
err = -ENOMEM;