3 files changed, 76 insertions, 4 deletions

diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index 2528f8a837d9..4d591bfce452 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -1200,6 +1200,8 @@ int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *,
 int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *);
 int sctp_bind_addr_match(struct sctp_bind_addr *, const union sctp_addr *,
                          struct sctp_sock *);
+int sctp_bind_addr_state(const struct sctp_bind_addr *bp,
+                         const union sctp_addr *addr);
 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr   *bp,
                                         const union sctp_addr   *addrs,
                                         int                     addrcnt,
diff --git a/net/sctp/bind_addr.c b/net/sctp/bind_addr.c
index 432661174789..13fbfb449a55 100644
--- a/net/sctp/bind_addr.c
+++ b/net/sctp/bind_addr.c
@@ -353,6 +353,32 @@ int sctp_bind_addr_match(struct sctp_bind_addr *bp,
         return match;
 }
 
+/* Get the state of the entry in the bind_addr_list */
+int sctp_bind_addr_state(const struct sctp_bind_addr *bp,
+                         const union sctp_addr *addr)
+{
+        struct sctp_sockaddr_entry *laddr;
+        struct sctp_af *af;
+        int state = -1;
+
+        af = sctp_get_af_specific(addr->sa.sa_family);
+        if (unlikely(!af))
+                return state;
+
+        rcu_read_lock();
+        list_for_each_entry_rcu(laddr, &bp->address_list, list) {
+                if (!laddr->valid)
+                        continue;
+                if (af->cmp_addr(&laddr->a, addr)) {
+                        state = laddr->state;
+                        break;
+                }
+        }
+        rcu_read_unlock();
+
+        return state;
+}
+
 /* Find the first address in the bind address list that is not present in
  * the addrs packed array.
  */
diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
index a1be9d93f1a8..0c9f37eb7d8d 100644
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -143,6 +143,12 @@ static sctp_ierror_t sctp_sf_authenticate(const struct sctp_endpoint *ep,
                                     const sctp_subtype_t type,
                                     struct sctp_chunk *chunk);
 
+static sctp_disposition_t __sctp_sf_do_9_1_abort(const struct sctp_endpoint *ep,
+                                        const struct sctp_association *asoc,
+                                        const sctp_subtype_t type,
+                                        void *arg,
+                                        sctp_cmd_seq_t *commands);
+
 /* Small helper function that checks if the chunk length
  * is of the appropriate length.  The 'required_length' argument
  * is set to be the size of a specific chunk we are testing.
@@ -2073,11 +2079,20 @@ sctp_disposition_t sctp_sf_shutdown_pending_abort(
         if (!sctp_chunk_length_valid(chunk, sizeof(sctp_abort_chunk_t)))
                 return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
 
+        /* ADD-IP: Special case for ABORT chunks
+         * F4)  One special consideration is that ABORT Chunks arriving
+         * destined to the IP address being deleted MUST be
+         * ignored (see Section 5.3.1 for further details).
+         */
+        if (SCTP_ADDR_DEL ==
+                    sctp_bind_addr_state(&asoc->base.bind_addr, &chunk->dest))
+                return sctp_sf_discard_chunk(ep, asoc, type, arg, commands);
+
         /* Stop the T5-shutdown guard timer.  */
         sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP,
                         SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD));
 
-        return sctp_sf_do_9_1_abort(ep, asoc, type, arg, commands);
+        return __sctp_sf_do_9_1_abort(ep, asoc, type, arg, commands);
 }
 
 /*
@@ -2109,6 +2124,15 @@ sctp_disposition_t sctp_sf_shutdown_sent_abort(const struct sctp_endpoint *ep,
         if (!sctp_chunk_length_valid(chunk, sizeof(sctp_abort_chunk_t)))
                 return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
 
+        /* ADD-IP: Special case for ABORT chunks
+         * F4)  One special consideration is that ABORT Chunks arriving
+         * destined to the IP address being deleted MUST be
+         * ignored (see Section 5.3.1 for further details).
+         */
+        if (SCTP_ADDR_DEL ==
+                    sctp_bind_addr_state(&asoc->base.bind_addr, &chunk->dest))
+                return sctp_sf_discard_chunk(ep, asoc, type, arg, commands);
+
         /* Stop the T2-shutdown timer. */
         sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP,
                         SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN));
@@ -2117,7 +2141,7 @@ sctp_disposition_t sctp_sf_shutdown_sent_abort(const struct sctp_endpoint *ep,
         sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP,
                         SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD));
 
-        return sctp_sf_do_9_1_abort(ep, asoc, type, arg, commands);
+        return __sctp_sf_do_9_1_abort(ep, asoc, type, arg, commands);
 }
 
 /*
@@ -2344,8 +2368,6 @@ sctp_disposition_t sctp_sf_do_9_1_abort(const struct sctp_endpoint *ep,
                                         sctp_cmd_seq_t *commands)
 {
         struct sctp_chunk *chunk = arg;
-        unsigned len;
-        __be16 error = SCTP_ERROR_NO_ERROR;
 
         if (!sctp_vtag_verify_either(chunk, asoc))
                 return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
@@ -2363,6 +2385,28 @@ sctp_disposition_t sctp_sf_do_9_1_abort(const struct sctp_endpoint *ep,
         if (!sctp_chunk_length_valid(chunk, sizeof(sctp_abort_chunk_t)))
                 return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
 
+        /* ADD-IP: Special case for ABORT chunks
+         * F4)  One special consideration is that ABORT Chunks arriving
+         * destined to the IP address being deleted MUST be
+         * ignored (see Section 5.3.1 for further details).
+         */
+        if (SCTP_ADDR_DEL ==
+                    sctp_bind_addr_state(&asoc->base.bind_addr, &chunk->dest))
+                return sctp_sf_discard_chunk(ep, asoc, type, arg, commands);
+
+        return __sctp_sf_do_9_1_abort(ep, asoc, type, arg, commands);
+}
+
+static sctp_disposition_t __sctp_sf_do_9_1_abort(const struct sctp_endpoint *ep,
+                                        const struct sctp_association *asoc,
+                                        const sctp_subtype_t type,
+                                        void *arg,
+                                        sctp_cmd_seq_t *commands)
+{
+        struct sctp_chunk *chunk = arg;
+        unsigned len;
+        __be16 error = SCTP_ERROR_NO_ERROR;
+
         /* See if we have an error cause code in the chunk.  */
         len = ntohs(chunk->chunk_hdr->length);
         if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_errhdr))