pfkey: fix SA and SP flush sequence

RFC 2367 says flushing behavior should be:
1) user space -> kernel: flush
2) kernel: flush
3) kernel -> user space: flush event to ALL listeners

This is not realistic today in the presence of selinux policies
which may reject the flush etc. So we make the sequence become:
1) user space -> kernel: flush
2) kernel: flush
3) kernel -> user space: flush response to originater from #1
4) if there were no errors then:
kernel -> user space: flush event to ALL listeners

Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 27 insertions, 6 deletions

diff --git a/net/key/af_key.c b/net/key/af_key.c
index 79d2c0f3c334..b3faede9a4f6 100644
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -1712,6 +1712,23 @@ static int pfkey_register(struct sock *sk, struct sk_buff *skb, struct sadb_msg
         return 0;
 }
 
+static int unicast_flush_resp(struct sock *sk, struct sadb_msg *ihdr)
+{
+        struct sk_buff *skb;
+        struct sadb_msg *hdr;
+
+        skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
+        if (!skb)
+                return -ENOBUFS;
+
+        hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
+        memcpy(hdr, ihdr, sizeof(struct sadb_msg));
+        hdr->sadb_msg_errno = (uint8_t) 0;
+        hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
+
+        return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
+}
+
 static int key_notify_sa_flush(struct km_event *c)
 {
         struct sk_buff *skb;
@@ -1740,7 +1757,7 @@ static int pfkey_flush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hd
         unsigned proto;
         struct km_event c;
         struct xfrm_audit audit_info;
-        int err;
+        int err, err2;
 
         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
         if (proto == 0)
@@ -1750,8 +1767,10 @@ static int pfkey_flush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hd
         audit_info.sessionid = audit_get_sessionid(current);
         audit_info.secid = 0;
         err = xfrm_state_flush(net, proto, &audit_info);
-        if (err)
-                return err;
+        err2 = unicast_flush_resp(sk, hdr);
+        if (err || err2)
+                return err ? err : err2;
+
         c.data.proto = proto;
         c.seq = hdr->sadb_msg_seq;
         c.pid = hdr->sadb_msg_pid;
@@ -2706,14 +2725,16 @@ static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, struct sadb_msg
         struct net *net = sock_net(sk);
         struct km_event c;
         struct xfrm_audit audit_info;
-        int err;
+        int err, err2;
 
         audit_info.loginuid = audit_get_loginuid(current);
         audit_info.sessionid = audit_get_sessionid(current);
         audit_info.secid = 0;
         err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
-        if (err)
-                return err;
+        err2 = unicast_flush_resp(sk, hdr);
+        if (err || err2)
+                return err ? err : err2;
+
         c.data.type = XFRM_POLICY_TYPE_MAIN;
         c.event = XFRM_MSG_FLUSHPOLICY;
         c.pid = hdr->sadb_msg_pid;