The branch main has been updated by tuexen:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=b621fbb1bf1b2a1e6ea22e0ad2d7667b1aec9fae

commit b621fbb1bf1b2a1e6ea22e0ad2d7667b1aec9fae
Author:     Michael Tuexen <tue...@freebsd.org>
AuthorDate: 2021-05-04 16:42:31 +0000
Commit:     Michael Tuexen <tue...@freebsd.org>
CommitDate: 2021-05-04 16:43:31 +0000

    sctp: drop packet with SHUTDOWN-ACK chunks with wrong vtags
    
    MFC after:      3 days
---
 sys/netinet/sctp_input.c | 21 ---------------------
 1 file changed, 21 deletions(-)

diff --git a/sys/netinet/sctp_input.c b/sys/netinet/sctp_input.c
index b6fe6449bc21..e1f096ea5817 100644
--- a/sys/netinet/sctp_input.c
+++ b/sys/netinet/sctp_input.c
@@ -4502,27 +4502,6 @@ sctp_process_control(struct mbuf *m, int iphlen, int 
*offset, int length,
                                }
                                return (NULL);
                        }
-               } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
-                       if (vtag_in != asoc->my_vtag) {
-                               /*
-                                * this could be a stale SHUTDOWN-ACK or the
-                                * peer never got the SHUTDOWN-COMPLETE and
-                                * is still hung; we have started a new asoc
-                                * but it won't complete until the shutdown
-                                * is completed
-                                */
-                               if (stcb != NULL) {
-                                       SCTP_TCB_UNLOCK(stcb);
-                               }
-                               SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at 
%s", __FILE__, __LINE__, __func__);
-                               op_err = 
sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
-                                   msg);
-                               sctp_handle_ootb(m, iphlen, *offset, src, dst,
-                                   sh, inp, op_err,
-                                   mflowtype, mflowid, fibnum,
-                                   vrf_id, port);
-                               return (NULL);
-                       }
                } else {
                        /* for all other chunks, vtag must match */
                        if (vtag_in != asoc->my_vtag) {
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