diff options
| author | Vlad Yasevich <vladislav.yasevich@hp.com> | 2007-05-04 22:55:27 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2007-05-04 22:55:27 +0200 |
| commit | 07d939677166cc4f000c767196872a9becc2697b (patch) | |
| tree | bef3d3c75ac3dd56813adbc63281feb4195a5b47 /net/sctp/sm_make_chunk.c | |
| parent | [SCTP]: Re-order SCTP initializations to avoid race with sctp_rcv() (diff) | |
| download | linux-07d939677166cc4f000c767196872a9becc2697b.tar.xz linux-07d939677166cc4f000c767196872a9becc2697b.zip | |
[SCTP]: Set assoc_id correctly during INIT collision.
During the INIT/COOKIE-ACK collision cases, it's possible to get
into a situation where the association id is not yet set at the time
of the user event generation. As a result, user events have an
association id set to 0 which will confuse applications.
This happens if we hit case B of duplicate cookie processing.
In the particular example found and provided by Oscar Isaula
<Oscar.Isaula@motorola.com>, flow looks like this:
A B
---- INIT-------> (lost)
<---------INIT------
---- INIT-ACK--->
<------ Cookie ECHO
When the Cookie Echo is received, we end up trying to update the
association that was created on A as a result of the (lost) INIT,
but that association doesn't have the ID set yet.
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.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.c | 15 |
1 files changed, 2 insertions, 13 deletions
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c index be783a3761c4..8d18f570c2e6 100644 --- a/net/sctp/sm_make_chunk.c +++ b/net/sctp/sm_make_chunk.c @@ -1939,7 +1939,6 @@ int sctp_process_init(struct sctp_association *asoc, sctp_cid_t cid, * association. */ if (!asoc->temp) { - int assoc_id; int error; asoc->ssnmap = sctp_ssnmap_new(asoc->c.sinit_max_instreams, @@ -1947,19 +1946,9 @@ int sctp_process_init(struct sctp_association *asoc, sctp_cid_t cid, if (!asoc->ssnmap) goto clean_up; - retry: - if (unlikely(!idr_pre_get(&sctp_assocs_id, gfp))) + error = sctp_assoc_set_id(asoc, gfp); + if (error) goto clean_up; - spin_lock_bh(&sctp_assocs_id_lock); - error = idr_get_new_above(&sctp_assocs_id, (void *)asoc, 1, - &assoc_id); - spin_unlock_bh(&sctp_assocs_id_lock); - if (error == -EAGAIN) - goto retry; - else if (error) - goto clean_up; - - asoc->assoc_id = (sctp_assoc_t) assoc_id; } /* ADDIP Section 4.1 ASCONF Chunk Procedures |