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| author | Cyrill Gorcunov <gorcunov@openvz.org> | 2012-11-03 09:30:34 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-11-04 01:56:49 -0400 |
| commit | cacb6ba0f36ab14a507f4ee7697e8332899015d2 (patch) | |
| tree | 824b41fdf7241048a9a5529d87cda49245e40d6d /net | |
| parent | efc7ce0334b68387b48baf16a285a9b1d5c19256 (diff) | |
| download | lwn-cacb6ba0f36ab14a507f4ee7697e8332899015d2.tar.gz lwn-cacb6ba0f36ab14a507f4ee7697e8332899015d2.zip | |
net: inet_diag -- Return error code if protocol handler is missed
We've observed that in case if UDP diag module is not
supported in kernel the netlink returns NLMSG_DONE without
notifying a caller that handler is missed.
This patch makes __inet_diag_dump to return error code instead.
So as example it become possible to detect such situation
and handle it gracefully on userspace level.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
CC: David Miller <davem@davemloft.net>
CC: Eric Dumazet <eric.dumazet@gmail.com>
CC: Pavel Emelyanov <xemul@parallels.com>
Acked-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/inet_diag.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c index 535584c00f91..0c34bfabc11f 100644 --- a/net/ipv4/inet_diag.c +++ b/net/ipv4/inet_diag.c @@ -892,13 +892,16 @@ static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, struct inet_diag_req_v2 *r, struct nlattr *bc) { const struct inet_diag_handler *handler; + int err = 0; handler = inet_diag_lock_handler(r->sdiag_protocol); if (!IS_ERR(handler)) handler->dump(skb, cb, r, bc); + else + err = PTR_ERR(handler); inet_diag_unlock_handler(handler); - return skb->len; + return err ? : skb->len; } static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) |