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SCTP: Fix protocol violation When receiving an error lenght INIT-ACK

PATCH In review Gui Jianfeng 2 participants 2 messages Mar 28, 2008

Subsystems (3)
Networking Network drivers SCTP protocol
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Gui Jianfeng

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#0 lore raw

PATCH 1/1 SCTP: Fix protocol violation When receiving an error lenght INIT-ACK

When receiving an error length INIT-ACK during COOKIE-WAIT, a 0-vtag ABORT will be responsed. This action violates the protocol apparently. This patch achieves the following things. 1 If the INIT-ACK contains all the fixed parameters, use init-tag
recorded from INIT-ACK as vtag.
2 If the INIT-ACK doesn't contain all the fixed parameters,
just reflect its vtag.

Signed-off-by Gui Jianfeng <[email protected]>
---
 include/net/sctp/command.h |    1 +
 net/sctp/outqueue.c        |    3 +++
 net/sctp/sm_sideeffect.c   |    5 ++++-
 net/sctp/sm_statefuns.c    |   18 ++++++++++++++++++
 4 files changed, 26 insertions(+), 1 deletions(-)
include/net/sctp/command.h +1 -0
index 10ae2da..35b1e83 100644
@@ -104,6 +104,7 @@ typedef enum {
 	SCTP_CMD_ADAPTATION_IND, /* generate and send adaptation event */
 	SCTP_CMD_ASSOC_SHKEY,    /* generate the association shared keys */
 	SCTP_CMD_T1_RETRAN,	 /* Mark for retransmission after T1 timeout  */
+	SCTP_CMD_UPDATE_INITTAG, /* Update peer inittag */
 	SCTP_CMD_LAST
 } sctp_verb_t;
net/sctp/outqueue.c +3 -0
index 1bb3c5c..c071446 100644
@@ -793,6 +793,9 @@ int sctp_outq_flush(struct sctp_outq *q, int rtx_timeout)
 			break;
 
 		case SCTP_CID_ABORT:
+			if (sctp_test_T_bit(chunk)) {
+				packet->vtag = asoc->c.my_vtag;
+			}
 		case SCTP_CID_SACK:
 		case SCTP_CID_HEARTBEAT:
 		case SCTP_CID_HEARTBEAT_ACK:
net/sctp/sm_sideeffect.c +4 -1
index 28eb38e..2dbc7bd 100644
@@ -1536,7 +1536,10 @@ static int sctp_cmd_interpreter(sctp_event_t event_type,
 			error = sctp_auth_asoc_init_active_key(asoc,
 						GFP_ATOMIC);
 			break;
-
+		case SCTP_CMD_UPDATE_INITTAG:
+			asoc->peer.i.init_tag = cmd->obj.u32;
+			break;
+			
 		default:
 			printk(KERN_WARNING "Impossible command: %u, %p\n",
 			       cmd->verb, cmd->obj.ptr);
net/sctp/sm_statefuns.c +18 -0
index f2ed647..1744a1e 100644
@@ -4144,6 +4144,24 @@ static sctp_disposition_t sctp_sf_abort_violation(
 		goto nomem;
 
 	if (asoc) {
+		/* Treat INIT-ACK as a special case during COOKIE-WAIT. */
+		if (chunk->chunk_hdr->type == SCTP_CID_INIT_ACK &&
+		    !asoc->peer.i.init_tag) {
+			sctp_initack_chunk_t *initack;
+
+			initack = (sctp_initack_chunk_t *)chunk->chunk_hdr;
+			if (!sctp_chunk_length_valid(chunk, 
+						     sizeof(sctp_initack_chunk_t)))
+				abort->chunk_hdr->flags |= SCTP_CHUNK_FLAG_T;
+			else {
+				unsigned int inittag;
+				
+				inittag = ntohl(initack->init_hdr.init_tag);
+				sctp_add_cmd_sf(commands, SCTP_CMD_UPDATE_INITTAG,
+						SCTP_U32(inittag));
+			}
+		}
+
 		sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort));
 		SCTP_INC_STATS(SCTP_MIB_OUTCTRLCHUNKS);
Signature · 7 lines
1.5.3



-- 
Regards
Gui Jianfeng
#1 lore raw
Quoted 10 lines · Gui Jianfeng

When receiving an error length INIT-ACK during COOKIE-WAIT, a 0-vtag ABORT will be responsed. This action violates the protocol apparently. This patch achieves the following things. 1 If the INIT-ACK contains all the fixed parameters, use init-tag
recorded from INIT-ACK as vtag.
2 If the INIT-ACK doesn't contain all the fixed parameters,
just reflect its vtag.

Signed-off-by Gui Jianfeng <[email protected]>

---

I applied this although there we witespace errors (which I fixed up). I'll push this to David shortly.

-vlad