From eb4cb008529ca08e0d8c0fa54e8f739520197a65 Mon Sep 17 00:00:00 2001 From: Craig Gallek Date: Mon, 15 Jun 2015 11:26:18 -0400 Subject: 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 Acked-by: Eric Dumazet Signed-off-by: David S. Miller --- include/linux/sock_diag.h | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) (limited to 'include/linux/sock_diag.h') 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 #include +#include +#include #include 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 -- cgit v1.2.3-59-g8ed1b