[PATCH net-next 0/3] Socket destruction events via netlink sock_diag

[PATCH net-next 0/3] Socket destruction events via netlink sock_diag

[Craig Gallek]

This series extends the netlink sock_diag interface to broadcast
socket information as they are being destroyed.  The current
interface is poll based and can not be used to retreive information
about sockets that are destroyed between poll intervals.

Only inet sockets are broadcast in this implementation, but other
families could easily be added as needed in the future.

If this patch set is accepted, a follow-up patch to the ss utility
in the iproute2 suite will also be submitted.

Craig Gallek (3):
  sock_diag: define destruction multicast groups
  sock_diag: specify info_size per inet protocol
  sock_diag: implement a get_info handler for inet

 include/linux/inet_diag.h      |  1 +
 include/linux/sock_diag.h      | 42 +++++++++++++++++++++
 include/net/sock.h             |  1 +
 include/uapi/linux/inet_diag.h |  3 +-
 include/uapi/linux/sock_diag.h | 10 +++++
 net/core/sock.c                | 11 +++++-
 net/core/sock_diag.c           | 85 ++++++++++++++++++++++++++++++++++++++++++
 net/dccp/diag.c                |  1 +
 net/ipv4/inet_diag.c           | 50 ++++++++++++++++++++++++-
 net/ipv4/tcp.c                 |  4 +-
 net/ipv4/tcp_diag.c            |  6 ++-
 net/ipv4/udp_diag.c            |  2 +
 12 files changed, 209 insertions(+), 7 deletions(-)

-- 
2.2.0.rc0.207.ga3a616c

[PATCH net-next 1/3] sock_diag: define destruction multicast groups

[Craig Gallek]

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>
---
 include/linux/sock_diag.h      | 42 +++++++++++++++++++++
 include/net/sock.h             |  1 +
 include/uapi/linux/sock_diag.h | 10 +++++
 net/core/sock.c                | 11 +++++-
 net/core/sock_diag.c           | 85 ++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 148 insertions(+), 1 deletion(-)

diff --git a/include/linux/sock_diag.h b/include/linux/sock_diag.h
index 083ac38..fddebc6 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
diff --git a/include/net/sock.h b/include/net/sock.h
index 26c1c31..3e82586 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1518,6 +1518,7 @@ static inline void unlock_sock_fast(struct sock *sk, bool slow)
 struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
 		      struct proto *prot, int kern);
 void sk_free(struct sock *sk);
+void sk_destruct(struct sock *sk);
 struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority);
 
 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
diff --git a/include/uapi/linux/sock_diag.h b/include/uapi/linux/sock_diag.h
index b00e29e..49230d3 100644
--- a/include/uapi/linux/sock_diag.h
+++ b/include/uapi/linux/sock_diag.h
@@ -23,4 +23,14 @@ enum {
 	SK_MEMINFO_VARS,
 };
 
+enum sknetlink_groups {
+	SKNLGRP_NONE,
+	SKNLGRP_INET_TCP_DESTROY,
+	SKNLGRP_INET_UDP_DESTROY,
+	SKNLGRP_INET6_TCP_DESTROY,
+	SKNLGRP_INET6_UDP_DESTROY,
+	__SKNLGRP_MAX,
+};
+#define SKNLGRP_MAX	(__SKNLGRP_MAX - 1)
+
 #endif /* _UAPI__SOCK_DIAG_H__ */
diff --git a/net/core/sock.c b/net/core/sock.c
index 7063c32..1e1fe9a 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -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)
 {
 	/*
diff --git a/net/core/sock_diag.c b/net/core/sock_diag.c
index 74dddf8..d79866c 100644
--- a/net/core/sock_diag.c
+++ b/net/core/sock_diag.c
@@ -5,6 +5,9 @@
 #include <net/net_namespace.h>
 #include <linux/module.h>
 #include <net/sock.h>
+#include <linux/kernel.h>
+#include <linux/tcp.h>
+#include <linux/workqueue.h>
 
 #include <linux/inet_diag.h>
 #include <linux/sock_diag.h>
@@ -12,6 +15,7 @@
 static const struct sock_diag_handler *sock_diag_handlers[AF_MAX];
 static int (*inet_rcv_compat)(struct sk_buff *skb, struct nlmsghdr *nlh);
 static DEFINE_MUTEX(sock_diag_table_mutex);
+static struct workqueue_struct *broadcast_wq;
 
 static u64 sock_gen_cookie(struct sock *sk)
 {
@@ -101,6 +105,62 @@ out:
 }
 EXPORT_SYMBOL(sock_diag_put_filterinfo);
 
+struct broadcast_sk {
+	struct sock *sk;
+	struct work_struct work;
+};
+
+static size_t sock_diag_nlmsg_size(void)
+{
+	return NLMSG_ALIGN(sizeof(struct inet_diag_msg)
+	       + nla_total_size(sizeof(u8)) /* INET_DIAG_PROTOCOL */
+	       + nla_total_size(sizeof(struct tcp_info))); /* INET_DIAG_INFO */
+}
+
+static void sock_diag_broadcast_destroy_work(struct work_struct *work)
+{
+	struct broadcast_sk *bsk =
+		container_of(work, struct broadcast_sk, work);
+	struct sock *sk = bsk->sk;
+	const struct sock_diag_handler *hndl;
+	struct sk_buff *skb;
+	const enum sknetlink_groups group = sock_diag_destroy_group(sk);
+	int err = -1;
+
+	WARN_ON(group == SKNLGRP_NONE);
+
+	skb = nlmsg_new(sock_diag_nlmsg_size(), GFP_KERNEL);
+	if (!skb)
+		goto out;
+
+	mutex_lock(&sock_diag_table_mutex);
+	hndl = sock_diag_handlers[sk->sk_family];
+	if (hndl && hndl->get_info)
+		err = hndl->get_info(skb, sk);
+	mutex_unlock(&sock_diag_table_mutex);
+
+	if (!err)
+		nlmsg_multicast(sock_net(sk)->diag_nlsk, skb, 0, group,
+				GFP_KERNEL);
+	else
+		kfree_skb(skb);
+out:
+	sk_destruct(sk);
+	kfree(bsk);
+}
+
+void sock_diag_broadcast_destroy(struct sock *sk)
+{
+	/* Note, this function is often called from an interrupt context. */
+	struct broadcast_sk *bsk =
+		kmalloc(sizeof(struct broadcast_sk), GFP_ATOMIC);
+	if (!bsk)
+		return sk_destruct(sk);
+	bsk->sk = sk;
+	INIT_WORK(&bsk->work, sock_diag_broadcast_destroy_work);
+	queue_work(broadcast_wq, &bsk->work);
+}
+
 void sock_diag_register_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh))
 {
 	mutex_lock(&sock_diag_table_mutex);
@@ -211,10 +271,32 @@ static void sock_diag_rcv(struct sk_buff *skb)
 	mutex_unlock(&sock_diag_mutex);
 }
 
+static int sock_diag_bind(struct net *net, int group)
+{
+	switch (group) {
+	case SKNLGRP_INET_TCP_DESTROY:
+	case SKNLGRP_INET_UDP_DESTROY:
+		if (!sock_diag_handlers[AF_INET])
+			request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
+				       NETLINK_SOCK_DIAG, AF_INET);
+		break;
+	case SKNLGRP_INET6_TCP_DESTROY:
+	case SKNLGRP_INET6_UDP_DESTROY:
+		if (!sock_diag_handlers[AF_INET6])
+			request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
+				       NETLINK_SOCK_DIAG, AF_INET);
+		break;
+	}
+	return 0;
+}
+
 static int __net_init diag_net_init(struct net *net)
 {
 	struct netlink_kernel_cfg cfg = {
+		.groups	= SKNLGRP_MAX,
 		.input	= sock_diag_rcv,
+		.bind	= sock_diag_bind,
+		.flags	= NL_CFG_F_NONROOT_RECV,
 	};
 
 	net->diag_nlsk = netlink_kernel_create(net, NETLINK_SOCK_DIAG, &cfg);
@@ -234,12 +316,15 @@ static struct pernet_operations diag_net_ops = {
 
 static int __init sock_diag_init(void)
 {
+	broadcast_wq = alloc_workqueue("sock_diag_events", 0, 0);
+	BUG_ON(!broadcast_wq);
 	return register_pernet_subsys(&diag_net_ops);
 }
 
 static void __exit sock_diag_exit(void)
 {
 	unregister_pernet_subsys(&diag_net_ops);
+	destroy_workqueue(broadcast_wq);
 }
 
 module_init(sock_diag_init);
-- 
2.2.0.rc0.207.ga3a616c

Re: [PATCH net-next 1/3] sock_diag: define destruction multicast groups

[Eric Dumazet]

On Mon, 2015-06-15 at 11:26 -0400, Craig Gallek wrote:
> 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>

[PATCH net-next 2/3] sock_diag: specify info_size per inet protocol

[Craig Gallek]

Previously, there was no clear distinction between the inet protocols
that used struct tcp_info to report information and those that didn't.
This change adds a specific size attribute to the inet_diag_handler
struct which defines these interfaces.  This will make dispatching
sock_diag get_info requests identical for all inet protocols in a
following patch.

Tested: ss -au
Tested: ss -at
Signed-off-by: Craig Gallek <kraig@google.com>
---
 include/linux/inet_diag.h | 1 +
 net/dccp/diag.c           | 1 +
 net/ipv4/inet_diag.c      | 4 ++--
 net/ipv4/tcp_diag.c       | 1 +
 net/ipv4/udp_diag.c       | 2 ++
 5 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/include/linux/inet_diag.h b/include/linux/inet_diag.h
index ac48b10..0e707f0 100644
--- a/include/linux/inet_diag.h
+++ b/include/linux/inet_diag.h
@@ -24,6 +24,7 @@ struct inet_diag_handler {
 					  struct inet_diag_msg *r,
 					  void *info);
 	__u16		idiag_type;
+	__u16		idiag_info_size;
 };
 
 struct inet_connection_sock;
diff --git a/net/dccp/diag.c b/net/dccp/diag.c
index 5a45f8d..2d84303 100644
--- a/net/dccp/diag.c
+++ b/net/dccp/diag.c
@@ -66,6 +66,7 @@ static const struct inet_diag_handler dccp_diag_handler = {
 	.dump_one	 = dccp_diag_dump_one,
 	.idiag_get_info	 = dccp_diag_get_info,
 	.idiag_type	 = IPPROTO_DCCP,
+	.idiag_info_size = sizeof(struct tcp_info),
 };
 
 static int __init dccp_diag_init(void)
diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index 4d32262..b1f01174 100644
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -200,9 +200,9 @@ int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
 	}
 #undef EXPIRES_IN_MS
 
-	if (ext & (1 << (INET_DIAG_INFO - 1))) {
+	if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
 		attr = nla_reserve(skb, INET_DIAG_INFO,
-				   sizeof(struct tcp_info));
+				   handler->idiag_info_size);
 		if (!attr)
 			goto errout;
 
diff --git a/net/ipv4/tcp_diag.c b/net/ipv4/tcp_diag.c
index 79b34a0..423e388 100644
--- a/net/ipv4/tcp_diag.c
+++ b/net/ipv4/tcp_diag.c
@@ -50,6 +50,7 @@ static const struct inet_diag_handler tcp_diag_handler = {
 	.dump_one	 = tcp_diag_dump_one,
 	.idiag_get_info	 = tcp_diag_get_info,
 	.idiag_type	 = IPPROTO_TCP,
+	.idiag_info_size = sizeof(struct tcp_info),
 };
 
 static int __init tcp_diag_init(void)
diff --git a/net/ipv4/udp_diag.c b/net/ipv4/udp_diag.c
index b763c39..6116604 100644
--- a/net/ipv4/udp_diag.c
+++ b/net/ipv4/udp_diag.c
@@ -170,6 +170,7 @@ static const struct inet_diag_handler udp_diag_handler = {
 	.dump_one	 = udp_diag_dump_one,
 	.idiag_get_info  = udp_diag_get_info,
 	.idiag_type	 = IPPROTO_UDP,
+	.idiag_info_size = 0,
 };
 
 static void udplite_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
@@ -190,6 +191,7 @@ static const struct inet_diag_handler udplite_diag_handler = {
 	.dump_one	 = udplite_diag_dump_one,
 	.idiag_get_info  = udp_diag_get_info,
 	.idiag_type	 = IPPROTO_UDPLITE,
+	.idiag_info_size = 0,
 };
 
 static int __init udp_diag_init(void)
-- 
2.2.0.rc0.207.ga3a616c

Re: [PATCH net-next 2/3] sock_diag: specify info_size per inet protocol

[Eric Dumazet]

On Mon, 2015-06-15 at 11:26 -0400, Craig Gallek wrote:
> Previously, there was no clear distinction between the inet protocols
> that used struct tcp_info to report information and those that didn't.
> This change adds a specific size attribute to the inet_diag_handler
> struct which defines these interfaces.  This will make dispatching
> sock_diag get_info requests identical for all inet protocols in a
> following patch.
> 
> Tested: ss -au
> Tested: ss -at
> Signed-off-by: Craig Gallek <kraig@google.com>
> ---

Acked-by: Eric Dumazet <edumazet@google.com>

[PATCH net-next 3/3] sock_diag: implement a get_info handler for inet

[Craig Gallek]

This get_info handler will simply dispatch to the appropriate
existing inet protocol handler.

This patch also includes a new netlink attribute
(INET_DIAG_PROTOCOL).  This attribute is currently only used
for multicast messages.  Without this attribute, there is no
way of knowing the IP protocol used by the socket information
being broadcast.  This attribute is not necessary in the 'dump'
variant of this protocol (though it could easily be added)
because dump requests are issued for specific family/protocol
pairs.

Tested: ss -E (note, the -E option has not yet been merged into
the upstream version of ss).

Signed-off-by: Craig Gallek <kraig@google.com>
---
 include/uapi/linux/inet_diag.h |  3 ++-
 net/ipv4/inet_diag.c           | 46 ++++++++++++++++++++++++++++++++++++++++++
 net/ipv4/tcp.c                 |  4 +++-
 net/ipv4/tcp_diag.c            |  5 +++--
 4 files changed, 54 insertions(+), 4 deletions(-)

diff --git a/include/uapi/linux/inet_diag.h b/include/uapi/linux/inet_diag.h
index c7093c7..b629fc5 100644
--- a/include/uapi/linux/inet_diag.h
+++ b/include/uapi/linux/inet_diag.h
@@ -111,9 +111,10 @@ enum {
 	INET_DIAG_SKMEMINFO,
 	INET_DIAG_SHUTDOWN,
 	INET_DIAG_DCTCPINFO,
+	INET_DIAG_PROTOCOL,  /* response attribute only */
 };
 
-#define INET_DIAG_MAX INET_DIAG_DCTCPINFO
+#define INET_DIAG_MAX INET_DIAG_PROTOCOL
 
 /* INET_DIAG_MEM */
 
diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index b1f01174..21985d8 100644
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -1078,14 +1078,60 @@ static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
 	return inet_diag_get_exact(skb, h, nlmsg_data(h));
 }
 
+static
+int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
+{
+	const struct inet_diag_handler *handler;
+	struct nlmsghdr *nlh;
+	struct nlattr *attr;
+	struct inet_diag_msg *r;
+	void *info = NULL;
+	int err = 0;
+
+	nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
+	if (!nlh)
+		return -ENOMEM;
+
+	r = nlmsg_data(nlh);
+	memset(r, 0, sizeof(*r));
+	inet_diag_msg_common_fill(r, sk);
+	r->idiag_state = sk->sk_state;
+
+	if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
+		nlmsg_cancel(skb, nlh);
+		return err;
+	}
+
+	handler = inet_diag_lock_handler(sk->sk_protocol);
+	if (IS_ERR(handler)) {
+		inet_diag_unlock_handler(handler);
+		nlmsg_cancel(skb, nlh);
+		return PTR_ERR(handler);
+	}
+
+	attr = handler->idiag_info_size
+		? nla_reserve(skb, INET_DIAG_INFO, handler->idiag_info_size)
+		: NULL;
+	if (attr)
+		info = nla_data(attr);
+
+	handler->idiag_get_info(sk, r, info);
+	inet_diag_unlock_handler(handler);
+
+	nlmsg_end(skb, nlh);
+	return 0;
+}
+
 static const struct sock_diag_handler inet_diag_handler = {
 	.family = AF_INET,
 	.dump = inet_diag_handler_dump,
+	.get_info = inet_diag_handler_get_info,
 };
 
 static const struct sock_diag_handler inet6_diag_handler = {
 	.family = AF_INET6,
 	.dump = inet_diag_handler_dump,
+	.get_info = inet_diag_handler_get_info,
 };
 
 int inet_diag_register(const struct inet_diag_handler *h)
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 65f791f..697b86d 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -2624,13 +2624,15 @@ EXPORT_SYMBOL(compat_tcp_setsockopt);
 /* Return information about state of tcp endpoint in API format. */
 void tcp_get_info(struct sock *sk, struct tcp_info *info)
 {
-	const struct tcp_sock *tp = tcp_sk(sk);
+	const struct tcp_sock *tp = tcp_sk(sk); /* iff sk_type == SOCK_STREAM */
 	const struct inet_connection_sock *icsk = inet_csk(sk);
 	u32 now = tcp_time_stamp;
 	unsigned int start;
 	u32 rate;
 
 	memset(info, 0, sizeof(*info));
+	if (sk->sk_type != SOCK_STREAM)
+		return;
 
 	info->tcpi_state = sk->sk_state;
 	info->tcpi_ca_state = icsk->icsk_ca_state;
diff --git a/net/ipv4/tcp_diag.c b/net/ipv4/tcp_diag.c
index 423e388..479f349 100644
--- a/net/ipv4/tcp_diag.c
+++ b/net/ipv4/tcp_diag.c
@@ -19,13 +19,14 @@
 static void tcp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
 			      void *_info)
 {
-	const struct tcp_sock *tp = tcp_sk(sk);
 	struct tcp_info *info = _info;
 
 	if (sk->sk_state == TCP_LISTEN) {
 		r->idiag_rqueue = sk->sk_ack_backlog;
 		r->idiag_wqueue = sk->sk_max_ack_backlog;
-	} else {
+	} else if (sk->sk_type == SOCK_STREAM) {
+		const struct tcp_sock *tp = tcp_sk(sk);
+
 		r->idiag_rqueue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0);
 		r->idiag_wqueue = tp->write_seq - tp->snd_una;
 	}
-- 
2.2.0.rc0.207.ga3a616c

Re: [PATCH net-next 3/3] sock_diag: implement a get_info handler for inet

[Eric Dumazet]

On Mon, 2015-06-15 at 11:26 -0400, Craig Gallek wrote:
> This get_info handler will simply dispatch to the appropriate
> existing inet protocol handler.
> 
> This patch also includes a new netlink attribute
> (INET_DIAG_PROTOCOL).  This attribute is currently only used
> for multicast messages.  Without this attribute, there is no
> way of knowing the IP protocol used by the socket information
> being broadcast.  This attribute is not necessary in the 'dump'
> variant of this protocol (though it could easily be added)
> because dump requests are issued for specific family/protocol
> pairs.
> 
> Tested: ss -E (note, the -E option has not yet been merged into
> the upstream version of ss).
> 
> Signed-off-by: Craig Gallek <kraig@google.com>
> ---

Note to readers : This extension was discussed during web10g talk in
Ottawa.

Acked-by: Eric Dumazet <edumazet@google.com>

Thanks Craig !

Re: [PATCH net-next 0/3] Socket destruction events via netlink sock_diag

[Marcelo Ricardo Leitner]

On Mon, Jun 15, 2015 at 11:26:17AM -0400, Craig Gallek wrote:
> This series extends the netlink sock_diag interface to broadcast
> socket information as they are being destroyed.  The current
> interface is poll based and can not be used to retreive information
> about sockets that are destroyed between poll intervals.
> 
> Only inet sockets are broadcast in this implementation, but other
> families could easily be added as needed in the future.
> 
> If this patch set is accepted, a follow-up patch to the ss utility
> in the iproute2 suite will also be submitted.
> 
> Craig Gallek (3):
>   sock_diag: define destruction multicast groups
>   sock_diag: specify info_size per inet protocol
>   sock_diag: implement a get_info handler for inet
> 
>  include/linux/inet_diag.h      |  1 +
>  include/linux/sock_diag.h      | 42 +++++++++++++++++++++
>  include/net/sock.h             |  1 +
>  include/uapi/linux/inet_diag.h |  3 +-
>  include/uapi/linux/sock_diag.h | 10 +++++
>  net/core/sock.c                | 11 +++++-
>  net/core/sock_diag.c           | 85 ++++++++++++++++++++++++++++++++++++++++++
>  net/dccp/diag.c                |  1 +
>  net/ipv4/inet_diag.c           | 50 ++++++++++++++++++++++++-
>  net/ipv4/tcp.c                 |  4 +-
>  net/ipv4/tcp_diag.c            |  6 ++-
>  net/ipv4/udp_diag.c            |  2 +
>  12 files changed, 209 insertions(+), 7 deletions(-)
> 
> -- 
> 2.2.0.rc0.207.ga3a616c
> 

Looks good to me, thanks Craig.
Reviewed-by: Marcelo Ricardo Leitner <mleitner@redhat.com>

Re: [PATCH net-next 0/3] Socket destruction events via netlink sock_diag

[Eric Dumazet]

On Mon, 2015-06-15 at 11:26 -0400, Craig Gallek wrote:
> This series extends the netlink sock_diag interface to broadcast
> socket information as they are being destroyed.  The current
> interface is poll based and can not be used to retreive information
> about sockets that are destroyed between poll intervals.
> 
> Only inet sockets are broadcast in this implementation, but other
> families could easily be added as needed in the future.
> 
> If this patch set is accepted, a follow-up patch to the ss utility
> in the iproute2 suite will also be submitted.
> 
> Craig Gallek (3):
>   sock_diag: define destruction multicast groups
>   sock_diag: specify info_size per inet protocol
>   sock_diag: implement a get_info handler for inet

Acked-by: Eric Dumazet <edumazet@google.com>

Re: [PATCH net-next 0/3] Socket destruction events via netlink sock_diag

[David Miller]

From: Craig Gallek <kraig@google.com>
Date: Mon, 15 Jun 2015 11:26:17 -0400

> This series extends the netlink sock_diag interface to broadcast
> socket information as they are being destroyed.  The current
> interface is poll based and can not be used to retreive information
> about sockets that are destroyed between poll intervals.
> 
> Only inet sockets are broadcast in this implementation, but other
> families could easily be added as needed in the future.
> 
> If this patch set is accepted, a follow-up patch to the ss utility
> in the iproute2 suite will also be submitted.

Series applied, thanks Craig.