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authorXin Long <lucien.xin@gmail.com>2018-03-14 14:05:33 +0300
committerDavid S. Miller <davem@davemloft.net>2018-03-14 20:48:27 +0300
commitec2e506c680deaa8e1a087986db6d73ba63a04be (patch)
tree270ef77a11ef0a9a2075d4809910cc049d43250b /net/sctp/sm_make_chunk.c
parent601590ec155aadf5daa17a6f63a06d1bba5b5ce9 (diff)
downloadlinux-ec2e506c680deaa8e1a087986db6d73ba63a04be.tar.xz
sctp: add SCTP_AUTH_FREE_KEY type for AUTHENTICATION_EVENT
This patch is to add SCTP_AUTH_FREE_KEY type for AUTHENTICATION_EVENT, as described in section 6.1.8 of RFC6458. SCTP_AUTH_FREE_KEY: This report indicates that the SCTP implementation will no longer use the key identifier specified in auth_keynumber. After deactivating a key, it would never be used again, which means it's refcnt can't be held/increased by new chunks. But there may be some chunks in out queue still using it. So only when refcnt is 1, which means no chunk in outqueue is using/holding this key either, this EVENT would be sent. When users receive this notification, they could do DEL_KEY sockopt to remove this shkey, and also tell the peer that this key won't be used in any chunk thoroughly from now on, then the peer can remove it as well safely. Signed-off-by: Xin Long <lucien.xin@gmail.com> Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp/sm_make_chunk.c')
-rw-r--r--net/sctp/sm_make_chunk.c20
1 files changed, 19 insertions, 1 deletions
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index 10f071cdf188..cc20bc39ee7c 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -89,8 +89,26 @@ static void sctp_control_release_owner(struct sk_buff *skb)
{
struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg;
- if (chunk->shkey)
+ if (chunk->shkey) {
+ struct sctp_shared_key *shkey = chunk->shkey;
+ struct sctp_association *asoc = chunk->asoc;
+
+ /* refcnt == 2 and !list_empty mean after this release, it's
+ * not being used anywhere, and it's time to notify userland
+ * that this shkey can be freed if it's been deactivated.
+ */
+ if (shkey->deactivated && !list_empty(&shkey->key_list) &&
+ refcount_read(&shkey->refcnt) == 2) {
+ struct sctp_ulpevent *ev;
+
+ ev = sctp_ulpevent_make_authkey(asoc, shkey->key_id,
+ SCTP_AUTH_FREE_KEY,
+ GFP_KERNEL);
+ if (ev)
+ asoc->stream.si->enqueue_event(&asoc->ulpq, ev);
+ }
sctp_auth_shkey_release(chunk->shkey);
+ }
}
static void sctp_control_set_owner_w(struct sctp_chunk *chunk)