---

yaml
---
r: 65170
b: refs/heads/master
c: ece25df
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: d3f259687fd248aa4de477149481478c122ba48b
+refs/heads/master: ece25dfa0991f65c4e1d26beb1c3c45bda4239b8

trunk/include/net/sctp/sm.h

@@ -114,7 +114,6 @@ sctp_state_fn_t sctp_sf_do_4_C;
 sctp_state_fn_t sctp_sf_eat_data_6_2;
 sctp_state_fn_t sctp_sf_eat_data_fast_4_4;
 sctp_state_fn_t sctp_sf_eat_sack_6_2;
-sctp_state_fn_t sctp_sf_tabort_8_4_8;
 sctp_state_fn_t sctp_sf_operr_notify;
 sctp_state_fn_t sctp_sf_t1_init_timer_expire;
 sctp_state_fn_t sctp_sf_t1_cookie_timer_expire;

trunk/net/sctp/sm_statefuns.c

@@ -90,6 +90,11 @@ static sctp_disposition_t sctp_sf_shut_8_4_5(const struct sctp_endpoint *ep,
 					     const sctp_subtype_t type,
 					     void *arg,
 					     sctp_cmd_seq_t *commands);
+static sctp_disposition_t sctp_sf_tabort_8_4_8(const struct sctp_endpoint *ep,
+					const struct sctp_association *asoc,
+					const sctp_subtype_t type,
+					void *arg,
+					sctp_cmd_seq_t *commands);
 static struct sctp_sackhdr *sctp_sm_pull_sack(struct sctp_chunk *chunk);
 
 static sctp_disposition_t sctp_stop_t1_and_abort(sctp_cmd_seq_t *commands,
@@ -98,6 +103,7 @@ static sctp_disposition_t sctp_stop_t1_and_abort(sctp_cmd_seq_t *commands,
 					   struct sctp_transport *transport);
 
 static sctp_disposition_t sctp_sf_abort_violation(
+				     const struct sctp_endpoint *ep,
 				     const struct sctp_association *asoc,
 				     void *arg,
 				     sctp_cmd_seq_t *commands,
@@ -118,6 +124,13 @@ static sctp_disposition_t sctp_sf_violation_ctsn(
 				     void *arg,
 				     sctp_cmd_seq_t *commands);
 
+static sctp_disposition_t sctp_sf_violation_chunk(
+				     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.
@@ -181,16 +194,21 @@ sctp_disposition_t sctp_sf_do_4_C(const struct sctp_endpoint *ep,
 	struct sctp_chunk *chunk = arg;
 	struct sctp_ulpevent *ev;
 
+	if (!sctp_vtag_verify_either(chunk, asoc))
+		return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
+
 	/* RFC 2960 6.10 Bundling
 	 *
 	 * An endpoint MUST NOT bundle INIT, INIT ACK or
 	 * SHUTDOWN COMPLETE with any other chunks.
 	 */
 	if (!chunk->singleton)
-		return SCTP_DISPOSITION_VIOLATION;
+		return sctp_sf_violation_chunk(ep, asoc, type, arg, commands);
 
-	if (!sctp_vtag_verify_either(chunk, asoc))
-		return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
+	/* Make sure that the SHUTDOWN_COMPLETE chunk has a valid length. */
+	if (!sctp_chunk_length_valid(chunk, sizeof(sctp_chunkhdr_t)))
+		return sctp_sf_violation_chunklen(ep, asoc, type, arg,
+						  commands);
 
 	/* RFC 2960 10.2 SCTP-to-ULP
 	 *
@@ -450,17 +468,17 @@ sctp_disposition_t sctp_sf_do_5_1C_ack(const struct sctp_endpoint *ep,
 	if (!sctp_vtag_verify(chunk, asoc))
 		return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
 
-	/* Make sure that the INIT-ACK chunk has a valid length */
-	if (!sctp_chunk_length_valid(chunk, sizeof(sctp_initack_chunk_t)))
-		return sctp_sf_violation_chunklen(ep, asoc, type, arg,
-						  commands);
 	/* 6.10 Bundling
 	 * An endpoint MUST NOT bundle INIT, INIT ACK or
 	 * SHUTDOWN COMPLETE with any other chunks.
 	 */
 	if (!chunk->singleton)
-		return SCTP_DISPOSITION_VIOLATION;
+		return sctp_sf_violation_chunk(ep, asoc, type, arg, commands);
 
+	/* Make sure that the INIT-ACK chunk has a valid length */
+	if (!sctp_chunk_length_valid(chunk, sizeof(sctp_initack_chunk_t)))
+		return sctp_sf_violation_chunklen(ep, asoc, type, arg,
+						  commands);
 	/* Grab the INIT header.  */
 	chunk->subh.init_hdr = (sctp_inithdr_t *) chunk->skb->data;
 
@@ -585,7 +603,7 @@ sctp_disposition_t sctp_sf_do_5_1D_ce(const struct sctp_endpoint *ep,
 	 * control endpoint, respond with an ABORT.
 	 */
 	if (ep == sctp_sk((sctp_get_ctl_sock()))->ep)
-		return sctp_sf_ootb(ep, asoc, type, arg, commands);
+		return sctp_sf_tabort_8_4_8(ep, asoc, type, arg, commands);
 
 	/* Make sure that the COOKIE_ECHO chunk has a valid length.
 	 * In this case, we check that we have enough for at least a
@@ -2496,6 +2514,11 @@ sctp_disposition_t sctp_sf_do_9_2_reshutack(const struct sctp_endpoint *ep,
 	struct sctp_chunk *chunk = (struct sctp_chunk *) arg;
 	struct sctp_chunk *reply;
 
+	/* Make sure that the chunk has a valid length */
+	if (!sctp_chunk_length_valid(chunk, sizeof(sctp_chunkhdr_t)))
+		return sctp_sf_violation_chunklen(ep, asoc, type, arg,
+						  commands);
+
 	/* Since we are not going to really process this INIT, there
 	 * is no point in verifying chunk boundries.  Just generate
 	 * the SHUTDOWN ACK.
@@ -2929,7 +2952,7 @@ sctp_disposition_t sctp_sf_eat_sack_6_2(const struct sctp_endpoint *ep,
  *
  * The return value is the disposition of the chunk.
 */
-sctp_disposition_t sctp_sf_tabort_8_4_8(const struct sctp_endpoint *ep,
+static sctp_disposition_t sctp_sf_tabort_8_4_8(const struct sctp_endpoint *ep,
 					const struct sctp_association *asoc,
 					const sctp_subtype_t type,
 					void *arg,
@@ -3126,14 +3149,14 @@ sctp_disposition_t sctp_sf_ootb(const struct sctp_endpoint *ep,
 
 	ch = (sctp_chunkhdr_t *) chunk->chunk_hdr;
 	do {
-		/* Break out if chunk length is less then minimal. */
+		/* Report violation if the chunk is less then minimal */
 		if (ntohs(ch->length) < sizeof(sctp_chunkhdr_t))
-			break;
-
-		ch_end = ((__u8 *)ch) + WORD_ROUND(ntohs(ch->length));
-		if (ch_end > skb_tail_pointer(skb))
-			break;
+			return sctp_sf_violation_chunklen(ep, asoc, type, arg,
+						  commands);
 
+		/* Now that we know we at least have a chunk header,
+		 * do things that are type appropriate.
+		 */
 		if (SCTP_CID_SHUTDOWN_ACK == ch->type)
 			ootb_shut_ack = 1;
 
@@ -3145,6 +3168,12 @@ sctp_disposition_t sctp_sf_ootb(const struct sctp_endpoint *ep,
 		if (SCTP_CID_ABORT == ch->type)
 			return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
 
+		/* Report violation if chunk len overflows */
+		ch_end = ((__u8 *)ch) + WORD_ROUND(ntohs(ch->length));
+		if (ch_end > skb_tail_pointer(skb))
+			return sctp_sf_violation_chunklen(ep, asoc, type, arg,
+						  commands);
+
 		ch = (sctp_chunkhdr_t *) ch_end;
 	} while (ch_end < skb_tail_pointer(skb));
 
@@ -3244,6 +3273,13 @@ sctp_disposition_t sctp_sf_do_8_5_1_E_sa(const struct sctp_endpoint *ep,
 				      void *arg,
 				      sctp_cmd_seq_t *commands)
 {
+	struct sctp_chunk *chunk = arg;
+
+	/* Make sure that the SHUTDOWN_ACK chunk has a valid length. */
+	if (!sctp_chunk_length_valid(chunk, sizeof(sctp_chunkhdr_t)))
+		return sctp_sf_violation_chunklen(ep, asoc, type, arg,
+						  commands);
+
 	/* Although we do have an association in this case, it corresponds
 	 * to a restarted association. So the packet is treated as an OOTB
 	 * packet and the state function that handles OOTB SHUTDOWN_ACK is
@@ -3658,6 +3694,16 @@ sctp_disposition_t sctp_sf_discard_chunk(const struct sctp_endpoint *ep,
 					 void *arg,
 					 sctp_cmd_seq_t *commands)
 {
+	struct sctp_chunk *chunk = arg;
+
+	/* Make sure that the chunk has a valid length.
+	 * Since we don't know the chunk type, we use a general
+	 * chunkhdr structure to make a comparison.
+	 */
+	if (!sctp_chunk_length_valid(chunk, sizeof(sctp_chunkhdr_t)))
+		return sctp_sf_violation_chunklen(ep, asoc, type, arg,
+						  commands);
+
 	SCTP_DEBUG_PRINTK("Chunk %d is discarded\n", type.chunk);
 	return SCTP_DISPOSITION_DISCARD;
 }
@@ -3713,19 +3759,28 @@ sctp_disposition_t sctp_sf_violation(const struct sctp_endpoint *ep,
 				     void *arg,
 				     sctp_cmd_seq_t *commands)
 {
+	struct sctp_chunk *chunk = arg;
+
+	/* Make sure that the chunk has a valid length. */
+	if (!sctp_chunk_length_valid(chunk, sizeof(sctp_chunkhdr_t)))
+		return sctp_sf_violation_chunklen(ep, asoc, type, arg,
+						  commands);
+
 	return SCTP_DISPOSITION_VIOLATION;
 }
 
 /*
  * Common function to handle a protocol violation.
  */
 static sctp_disposition_t sctp_sf_abort_violation(
+				     const struct sctp_endpoint *ep,
 				     const struct sctp_association *asoc,
 				     void *arg,
 				     sctp_cmd_seq_t *commands,
 				     const __u8 *payload,
 				     const size_t paylen)
 {
+	struct sctp_packet *packet = NULL;
 	struct sctp_chunk *chunk =  arg;
 	struct sctp_chunk *abort = NULL;
 
@@ -3734,30 +3789,51 @@ static sctp_disposition_t sctp_sf_abort_violation(
 	if (!abort)
 		goto nomem;
 
-	sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort));
-	SCTP_INC_STATS(SCTP_MIB_OUTCTRLCHUNKS);
+	if (asoc) {
+		sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort));
+		SCTP_INC_STATS(SCTP_MIB_OUTCTRLCHUNKS);
 
-	if (asoc->state <= SCTP_STATE_COOKIE_ECHOED) {
-		sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP,
-				SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT));
-		sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR,
-				SCTP_ERROR(ECONNREFUSED));
-		sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED,
-				SCTP_PERR(SCTP_ERROR_PROTO_VIOLATION));
+		if (asoc->state <= SCTP_STATE_COOKIE_ECHOED) {
+			sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP,
+					SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT));
+			sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR,
+					SCTP_ERROR(ECONNREFUSED));
+			sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED,
+					SCTP_PERR(SCTP_ERROR_PROTO_VIOLATION));
+		} else {
+			sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR,
+					SCTP_ERROR(ECONNABORTED));
+			sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED,
+					SCTP_PERR(SCTP_ERROR_PROTO_VIOLATION));
+			SCTP_DEC_STATS(SCTP_MIB_CURRESTAB);
+		}
 	} else {
-		sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR,
-				SCTP_ERROR(ECONNABORTED));
-		sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED,
-				SCTP_PERR(SCTP_ERROR_PROTO_VIOLATION));
-		SCTP_DEC_STATS(SCTP_MIB_CURRESTAB);
+		packet = sctp_ootb_pkt_new(asoc, chunk);
+
+		if (!packet)
+			goto nomem_pkt;
+
+		if (sctp_test_T_bit(abort))
+			packet->vtag = ntohl(chunk->sctp_hdr->vtag);
+
+		abort->skb->sk = ep->base.sk;
+
+		sctp_packet_append_chunk(packet, abort);
+
+		sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT,
+			SCTP_PACKET(packet));
+
+		SCTP_INC_STATS(SCTP_MIB_OUTCTRLCHUNKS);
 	}
 
-	sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL());
+	sctp_sf_pdiscard(ep, asoc, SCTP_ST_CHUNK(0), arg, commands);
 
 	SCTP_INC_STATS(SCTP_MIB_ABORTEDS);
 
 	return SCTP_DISPOSITION_ABORT;
 
+nomem_pkt:
+	sctp_chunk_free(abort);
 nomem:
 	return SCTP_DISPOSITION_NOMEM;
 }
@@ -3790,7 +3866,7 @@ static sctp_disposition_t sctp_sf_violation_chunklen(
 {
 	char err_str[]="The following chunk had invalid length:";
 
-	return sctp_sf_abort_violation(asoc, arg, commands, err_str,
+	return sctp_sf_abort_violation(ep, asoc, arg, commands, err_str,
 					sizeof(err_str));
 }
 
@@ -3809,10 +3885,31 @@ static sctp_disposition_t sctp_sf_violation_ctsn(
 {
 	char err_str[]="The cumulative tsn ack beyond the max tsn currently sent:";
 
-	return sctp_sf_abort_violation(asoc, arg, commands, err_str,
+	return sctp_sf_abort_violation(ep, asoc, arg, commands, err_str,
 					sizeof(err_str));
 }
 
+/* Handle protocol violation of an invalid chunk bundling.  For example,
+ * when we have an association and we recieve bundled INIT-ACK, or
+ * SHUDOWN-COMPLETE, our peer is clearly violationg the "MUST NOT bundle"
+ * statement from the specs.  Additinally, there might be an attacker
+ * on the path and we may not want to continue this communication.
+ */
+static sctp_disposition_t sctp_sf_violation_chunk(
+				     const struct sctp_endpoint *ep,
+				     const struct sctp_association *asoc,
+				     const sctp_subtype_t type,
+				     void *arg,
+				     sctp_cmd_seq_t *commands)
+{
+	char err_str[]="The following chunk violates protocol:";
+
+	if (!asoc)
+		return sctp_sf_violation(ep, asoc, type, arg, commands);
+
+	return sctp_sf_abort_violation(ep, asoc, arg, commands, err_str,
+					sizeof(err_str));
+}
 /***************************************************************************
  * These are the state functions for handling primitive (Section 10) events.
  ***************************************************************************/

trunk/net/sctp/sm_statetable.c

@@ -110,7 +110,7 @@ const sctp_sm_table_entry_t *sctp_sm_lookup_event(sctp_event_t event_type,
 	/* SCTP_STATE_EMPTY */ \
 	TYPE_SCTP_FUNC(sctp_sf_ootb), \
 	/* SCTP_STATE_CLOSED */ \
-	TYPE_SCTP_FUNC(sctp_sf_tabort_8_4_8), \
+	TYPE_SCTP_FUNC(sctp_sf_ootb), \
 	/* SCTP_STATE_COOKIE_WAIT */ \
 	TYPE_SCTP_FUNC(sctp_sf_discard_chunk), \
 	/* SCTP_STATE_COOKIE_ECHOED */ \
@@ -173,7 +173,7 @@ const sctp_sm_table_entry_t *sctp_sm_lookup_event(sctp_event_t event_type,
 	/*  SCTP_STATE_EMPTY */ \
 	TYPE_SCTP_FUNC(sctp_sf_ootb), \
 	/* SCTP_STATE_CLOSED */ \
-	TYPE_SCTP_FUNC(sctp_sf_tabort_8_4_8), \
+	TYPE_SCTP_FUNC(sctp_sf_ootb), \
 	/* SCTP_STATE_COOKIE_WAIT */ \
 	TYPE_SCTP_FUNC(sctp_sf_discard_chunk), \
 	/* SCTP_STATE_COOKIE_ECHOED */ \
@@ -194,7 +194,7 @@ const sctp_sm_table_entry_t *sctp_sm_lookup_event(sctp_event_t event_type,
 	/*  SCTP_STATE_EMPTY */ \
 	TYPE_SCTP_FUNC(sctp_sf_ootb), \
 	/* SCTP_STATE_CLOSED */ \
-	TYPE_SCTP_FUNC(sctp_sf_tabort_8_4_8), \
+	TYPE_SCTP_FUNC(sctp_sf_ootb), \
 	/* SCTP_STATE_COOKIE_WAIT */ \
 	TYPE_SCTP_FUNC(sctp_sf_discard_chunk), \
 	/* SCTP_STATE_COOKIE_ECHOED */ \
@@ -216,7 +216,7 @@ const sctp_sm_table_entry_t *sctp_sm_lookup_event(sctp_event_t event_type,
 	/*  SCTP_STATE_EMPTY */ \
 	TYPE_SCTP_FUNC(sctp_sf_ootb), \
 	/* SCTP_STATE_CLOSED */ \
-	TYPE_SCTP_FUNC(sctp_sf_tabort_8_4_8), \
+	TYPE_SCTP_FUNC(sctp_sf_ootb), \
 	/* SCTP_STATE_COOKIE_WAIT */ \
 	TYPE_SCTP_FUNC(sctp_sf_violation), \
 	/* SCTP_STATE_COOKIE_ECHOED */ \
@@ -258,7 +258,7 @@ const sctp_sm_table_entry_t *sctp_sm_lookup_event(sctp_event_t event_type,
 	/* SCTP_STATE_EMPTY */ \
 	TYPE_SCTP_FUNC(sctp_sf_ootb), \
 	/* SCTP_STATE_CLOSED */ \
-	TYPE_SCTP_FUNC(sctp_sf_tabort_8_4_8), \
+	TYPE_SCTP_FUNC(sctp_sf_ootb), \
 	/* SCTP_STATE_COOKIE_WAIT */ \
 	TYPE_SCTP_FUNC(sctp_sf_discard_chunk), \
 	/* SCTP_STATE_COOKIE_ECHOED */ \
@@ -300,7 +300,7 @@ const sctp_sm_table_entry_t *sctp_sm_lookup_event(sctp_event_t event_type,
 	/* SCTP_STATE_EMPTY */ \
 	TYPE_SCTP_FUNC(sctp_sf_ootb), \
 	/* SCTP_STATE_CLOSED */ \
-	TYPE_SCTP_FUNC(sctp_sf_tabort_8_4_8), \
+	TYPE_SCTP_FUNC(sctp_sf_ootb), \
 	/* SCTP_STATE_COOKIE_WAIT */ \
 	TYPE_SCTP_FUNC(sctp_sf_discard_chunk), \
 	/* SCTP_STATE_COOKIE_ECHOED */ \
@@ -499,7 +499,7 @@ static const sctp_sm_table_entry_t addip_chunk_event_table[SCTP_NUM_ADDIP_CHUNK_
 	/* SCTP_STATE_EMPTY */ \
 	TYPE_SCTP_FUNC(sctp_sf_ootb), \
 	/* SCTP_STATE_CLOSED */ \
-	TYPE_SCTP_FUNC(sctp_sf_tabort_8_4_8), \
+	TYPE_SCTP_FUNC(sctp_sf_ootb), \
 	/* SCTP_STATE_COOKIE_WAIT */ \
 	TYPE_SCTP_FUNC(sctp_sf_discard_chunk), \
 	/* SCTP_STATE_COOKIE_ECHOED */ \
@@ -528,7 +528,7 @@ chunk_event_table_unknown[SCTP_STATE_NUM_STATES] = {
 	/* SCTP_STATE_EMPTY */
 	TYPE_SCTP_FUNC(sctp_sf_ootb),
 	/* SCTP_STATE_CLOSED */
-	TYPE_SCTP_FUNC(sctp_sf_tabort_8_4_8),
+	TYPE_SCTP_FUNC(sctp_sf_ootb),
 	/* SCTP_STATE_COOKIE_WAIT */
 	TYPE_SCTP_FUNC(sctp_sf_unk_chunk),
 	/* SCTP_STATE_COOKIE_ECHOED */