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net: diag: Add the ability to destroy a socket.

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This patch adds a SOCK_DESTROY operation, a destroy function
pointer to sock_diag_handler, and a diag_destroy function
pointer.  It does not include any implementation code.

Signed-off-by: Lorenzo Colitti <lorenzo@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Lorenzo Colitti
2015-12-16 12:30:03 +09:00
committed by David S. Miller
parent b613f56ec9
commit 64be0aed59
4 changed files with 24 additions and 3 deletions
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23
net/core/sock_diag.c
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@@ -214,7 +214,7 @@ void sock_diag_unregister(const struct sock_diag_handler *hnld)
}
EXPORT_SYMBOL_GPL(sock_diag_unregister);
static int __sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
static int __sock_diag_cmd(struct sk_buff *skb, struct nlmsghdr *nlh)
{
int err;
struct sock_diag_req *req = nlmsg_data(nlh);
@@ -234,8 +234,12 @@ static int __sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
hndl = sock_diag_handlers[req->sdiag_family];
if (hndl == NULL)
err = -ENOENT;
else
else if (nlh->nlmsg_type == SOCK_DIAG_BY_FAMILY)
err = hndl->dump(skb, nlh);
else if (nlh->nlmsg_type == SOCK_DESTROY && hndl->destroy)
err = hndl->destroy(skb, nlh);
else
err = -EOPNOTSUPP;
mutex_unlock(&sock_diag_table_mutex);
return err;
@@ -261,7 +265,8 @@ static int sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
return ret;
case SOCK_DIAG_BY_FAMILY:
return __sock_diag_rcv_msg(skb, nlh);
case SOCK_DESTROY:
return __sock_diag_cmd(skb, nlh);
default:
return -EINVAL;
}
@@ -295,6 +300,18 @@ static int sock_diag_bind(struct net *net, int group)
return 0;
}
int sock_diag_destroy(struct sock *sk, int err)
{
if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
return -EPERM;
if (!sk->sk_prot->diag_destroy)
return -EOPNOTSUPP;
return sk->sk_prot->diag_destroy(sk, err);
}
EXPORT_SYMBOL_GPL(sock_diag_destroy);
static int __net_init diag_net_init(struct net *net)
{
struct netlink_kernel_cfg cfg = {