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sctp: introduce SCTP_FUTURE/CURRENT/ALL_ASSOC 

This patch is to add 3 constants SCTP_FUTURE_ASSOC,
SCTP_CURRENT_ASSOC and SCTP_ALL_ASSOC for reserved
assoc_ids, as defined in rfc6458#section-7.2.

And add the process for them when doing lookup and
inserting in sctp_id2assoc and sctp_assoc_set_id.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long 2019-01-28 15:08:23 +08:00 committed by David S. Miller
parent bde5272643
commit 80df2704a3
3 changed files with 10 additions and 3 deletions
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4
include/uapi/linux/sctp.h
View File

@ -59,6 +59,10 @@
typedef __s32 sctp_assoc_t;
#define SCTP_FUTURE_ASSOC 0
#define SCTP_CURRENT_ASSOC 1
#define SCTP_ALL_ASSOC 2
/* The following symbols come from the Sockets API Extensions for
* SCTP <draft-ietf-tsvwg-sctpsocket-07.txt>.
*/

7
net/sctp/associola.c
View File

@ -1651,8 +1651,11 @@ int sctp_assoc_set_id(struct sctp_association *asoc, gfp_t gfp)
if (preload)
idr_preload(gfp);
spin_lock_bh(&sctp_assocs_id_lock);
/* 0 is not a valid assoc_id, must be >= 1 */
ret = idr_alloc_cyclic(&sctp_assocs_id, asoc, 1, 0, GFP_NOWAIT);
/* 0, 1, 2 are used as SCTP_FUTURE_ASSOC, SCTP_CURRENT_ASSOC and
* SCTP_ALL_ASSOC, so an available id must be > SCTP_ALL_ASSOC.
*/
ret = idr_alloc_cyclic(&sctp_assocs_id, asoc, SCTP_ALL_ASSOC + 1, 0,
GFP_NOWAIT);
spin_unlock_bh(&sctp_assocs_id_lock);
if (preload)
idr_preload_end();

2
net/sctp/socket.c
View File

@ -248,7 +248,7 @@ struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
}
/* Otherwise this is a UDP-style socket. */
if (!id || (id == (sctp_assoc_t)-1))
if (id <= SCTP_ALL_ASSOC)
return NULL;
spin_lock_bh(&sctp_assocs_id_lock);