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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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11
net/core/sock.c
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@@ -131,6 +131,7 @@
#include <linux/ipsec.h>
#include <net/cls_cgroup.h>
#include <net/netprio_cgroup.h>
#include <linux/sock_diag.h>
#include <linux/filter.h>
@@ -1423,7 +1424,7 @@ struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
}
EXPORT_SYMBOL(sk_alloc);
static void __sk_free(struct sock *sk)
void sk_destruct(struct sock *sk)
{
struct sk_filter *filter;
@@ -1451,6 +1452,14 @@ static void __sk_free(struct sock *sk)
sk_prot_free(sk->sk_prot_creator, sk);
}
static void __sk_free(struct sock *sk)
{
if (unlikely(sock_diag_has_destroy_listeners(sk)))
sock_diag_broadcast_destroy(sk);
else
sk_destruct(sk);
}
void sk_free(struct sock *sk)
{
/*