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sock_diag: define destruction multicast groups

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These groups will contain socket-destruction events for
AF_INET/AF_INET6, IPPROTO_TCP/IPPROTO_UDP.

Near the end of socket destruction, a check for listeners is
performed.  In the presence of a listener, rather than completely
cleanup the socket, a unit of work will be added to a private
work queue which will first broadcast information about the socket
and then finish the cleanup operation.

Signed-off-by: Craig Gallek <kraig@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Craig Gallek
2015-06-15 11:26:18 -04:00
committed by David S. Miller
parent 916035ddd3
commit eb4cb00852
5 changed files with 148 additions and 1 deletions
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42
include/linux/sock_diag.h
View File

@@ -1,7 +1,10 @@
#ifndef __SOCK_DIAG_H__
#define __SOCK_DIAG_H__
#include <linux/netlink.h>
#include <linux/user_namespace.h>
#include <net/net_namespace.h>
#include <net/sock.h>
#include <uapi/linux/sock_diag.h>
struct sk_buff;
@@ -11,6 +14,7 @@ struct sock;
struct sock_diag_handler {
__u8 family;
int (*dump)(struct sk_buff *skb, struct nlmsghdr *nlh);
int (*get_info)(struct sk_buff *skb, struct sock *sk);
};
int sock_diag_register(const struct sock_diag_handler *h);
@@ -26,4 +30,42 @@ int sock_diag_put_meminfo(struct sock *sk, struct sk_buff *skb, int attr);
int sock_diag_put_filterinfo(bool may_report_filterinfo, struct sock *sk,
struct sk_buff *skb, int attrtype);
static inline
enum sknetlink_groups sock_diag_destroy_group(const struct sock *sk)
{
switch (sk->sk_family) {
case AF_INET:
switch (sk->sk_protocol) {
case IPPROTO_TCP:
return SKNLGRP_INET_TCP_DESTROY;
case IPPROTO_UDP:
return SKNLGRP_INET_UDP_DESTROY;
default:
return SKNLGRP_NONE;
}
case AF_INET6:
switch (sk->sk_protocol) {
case IPPROTO_TCP:
return SKNLGRP_INET6_TCP_DESTROY;
case IPPROTO_UDP:
return SKNLGRP_INET6_UDP_DESTROY;
default:
return SKNLGRP_NONE;
}
default:
return SKNLGRP_NONE;
}
}
static inline
bool sock_diag_has_destroy_listeners(const struct sock *sk)
{
const struct net *n = sock_net(sk);
const enum sknetlink_groups group = sock_diag_destroy_group(sk);
return group != SKNLGRP_NONE && n->diag_nlsk &&
netlink_has_listeners(n->diag_nlsk, group);
}
void sock_diag_broadcast_destroy(struct sock *sk);
#endif