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authorCraig Gallek <kraig@google.com>2015-06-15 11:26:18 -0400
committerDavid S. Miller <davem@davemloft.net>2015-06-15 19:49:22 -0700
commiteb4cb008529ca08e0d8c0fa54e8f739520197a65 (patch)
treee7f6c004e7e540abba090a618240c6426d2df956 /include/linux/sock_diag.h
parentMerge branch 'mlx4-vf-counters' (diff)
downloadlinux-dev-eb4cb008529ca08e0d8c0fa54e8f739520197a65.tar.xz
linux-dev-eb4cb008529ca08e0d8c0fa54e8f739520197a65.zip
sock_diag: define destruction multicast groups
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>
Diffstat (limited to 'include/linux/sock_diag.h')
-rw-r--r--include/linux/sock_diag.h42
1 files changed, 42 insertions, 0 deletions
diff --git a/include/linux/sock_diag.h b/include/linux/sock_diag.h
index 083ac388098e..fddebc617469 100644
--- a/include/linux/sock_diag.h
+++ b/include/linux/sock_diag.h
@@ -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