linux-kernel - [PATCH 16/18] xfrm: Notify compat listeners about policy flush

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Message-Id: <20180726023144.31066-17-dima@arista.com>
Date:   Thu, 26 Jul 2018 03:31:42 +0100
From:   Dmitry Safonov <dima@...sta.com>
To:     linux-kernel@...r.kernel.org
Cc:     Dmitry Safonov <dima@...sta.com>,
        "David S. Miller" <davem@...emloft.net>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Dmitry Safonov <0x7f454c46@...il.com>, netdev@...r.kernel.org
Subject: [PATCH 16/18] xfrm: Notify compat listeners about policy flush

Notify two groups of listeners:
XFRMNLGRP_POLICY - applications that uses native UABI for messages;
XFRMNLGRP_COMPAT_POLICY - applications that uses compat UABI for messages;

Cc: "David S. Miller" <davem@...emloft.net>
Cc: Herbert Xu <herbert@...dor.apana.org.au>
Cc: Steffen Klassert <steffen.klassert@...unet.com>
Cc: netdev@...r.kernel.org
Signed-off-by: Dmitry Safonov <dima@...sta.com>
---
 net/xfrm/xfrm_user.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 752019963b1e..7bba0638c014 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -3368,7 +3368,8 @@ static int xfrm_notify_policy(struct xfrm_policy *xp, int dir,
 	return __xfrm_notify_policy(xp, dir, c, true);
 }
 
-static int xfrm_notify_policy_flush(const struct km_event *c)
+static int __xfrm_notify_policy_flush(const struct km_event *c,
+			unsigned int group)
 {
 	struct net *net = c->net;
 	struct nlmsghdr *nlh;
@@ -3389,13 +3390,22 @@ static int xfrm_notify_policy_flush(const struct km_event *c)
 
 	nlmsg_end(skb, nlh);
 
-	return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
+	return xfrm_nlmsg_multicast(net, skb, 0, group);
 
 out_free_skb:
 	kfree_skb(skb);
 	return err;
 }
 
+static int xfrm_notify_policy_flush(const struct km_event *c)
+{
+	int ret = __xfrm_notify_policy_flush(c, XFRMNLGRP_POLICY);
+
+	if ((ret && ret != -ESRCH) || !IS_ENABLED(CONFIG_COMPAT))
+		return ret;
+	return __xfrm_notify_policy_flush(c, XFRMNLGRP_COMPAT_POLICY);
+}
+
 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
 {
 
-- 
2.13.6