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@xxxxxxxxx> --- include/uapi/linux/sctp.h | 4 ++++ net/sctp/associola.c | 7 +++++-- net/sctp/socket.c | 2 +- 3 files changed, 10 insertions(+), 3 deletions(-) diff --git a/include/uapi/linux/sctp.h b/include/uapi/linux/sctp.h index d584073..b8f2c4d 100644 --- a/include/uapi/linux/sctp.h +++ b/include/uapi/linux/sctp.h @@ -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>. */ diff --git a/net/sctp/associola.c b/net/sctp/associola.c index 201c888..b99f163 100644 --- a/net/sctp/associola.c +++ b/net/sctp/associola.c @@ -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(); diff --git a/net/sctp/socket.c b/net/sctp/socket.c index f93c3cf..a52d132 100644 --- a/net/sctp/socket.c +++ b/net/sctp/socket.c @@ -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); -- 2.1.0
