struct sctp_chunk *sctp_inq_pop(struct sctp_inq *queue)
{
	struct sctp_chunk *chunk;
	sctp_chunkhdr_t *ch = NULL;

	/* The assumption is that we are safe to process the chunks
	 * at this time.
	 */

	if ((chunk = queue->in_progress)) {
		/* There is a packet that we have been working on.
		 * Any post processing work to do before we move on?
		 */
		if (chunk->singleton ||
		    chunk->end_of_packet ||
		    chunk->pdiscard) {
			sctp_chunk_free(chunk);
			chunk = queue->in_progress = NULL;
		} else {
			/* Nothing to do. Next chunk in the packet, please. */
			ch = (sctp_chunkhdr_t *) chunk->chunk_end;

			/* Force chunk->skb->data to chunk->chunk_end.  */
			skb_pull(chunk->skb,
				 chunk->chunk_end - chunk->skb->data);
		}
	}

	/* Do we need to take the next packet out of the queue to process? */
	if (!chunk) {
		struct list_head *entry;

		/* Is the queue empty?  */
		if (list_empty(&queue->in_chunk_list))
			return NULL;

		entry = queue->in_chunk_list.next;
		chunk = queue->in_progress =
			list_entry(entry, struct sctp_chunk, list);
		list_del_init(entry);

		/* This is the first chunk in the packet.  */
		chunk->singleton = 1;
		ch = (sctp_chunkhdr_t *) chunk->skb->data;
		chunk->data_accepted = 0;
	}

        chunk->chunk_hdr = ch;
        chunk->chunk_end = ((__u8 *)ch) + WORD_ROUND(ntohs(ch->length));
	/* In the unlikely case of an IP reassembly, the skb could be
	 * non-linear. If so, update chunk_end so that it doesn't go past
	 * the skb->tail.
	 */
	if (unlikely(skb_is_nonlinear(chunk->skb))) {
		if (chunk->chunk_end > chunk->skb->tail)
			chunk->chunk_end = chunk->skb->tail;
	}
	skb_pull(chunk->skb, sizeof(sctp_chunkhdr_t));
	chunk->subh.v = NULL; /* Subheader is no longer valid.  */

	if (chunk->chunk_end < chunk->skb->tail) {
		/* This is not a singleton */
		chunk->singleton = 0;
	} else if (chunk->chunk_end > chunk->skb->tail) {
                /* RFC 2960, Section 6.10  Bundling
		 *
		 * Partial chunks MUST NOT be placed in an SCTP packet.
		 * If the receiver detects a partial chunk, it MUST drop
		 * the chunk.  
		 *
		 * Since the end of the chunk is past the end of our buffer
		 * (which contains the whole packet, we can freely discard
		 * the whole packet.
		 */
		sctp_chunk_free(chunk);
		chunk = queue->in_progress = NULL;

		return NULL;
	} else {
		/* We are at the end of the packet, so mark the chunk
		 * in case we need to send a SACK.
		 */
		chunk->end_of_packet = 1;
	}

	SCTP_DEBUG_PRINTK("+++sctp_inq_pop+++ chunk %p[%s],"
			  " length %d, skb->len %d\n",chunk,
			  sctp_cname(SCTP_ST_CHUNK(chunk->chunk_hdr->type)),
			  ntohs(chunk->chunk_hdr->length), chunk->skb->len);
	return chunk;
}
struct sctp_chunk *sctp_inq_pop(struct sctp_inq *queue)
{
	struct sctp_chunk *chunk;
	sctp_chunkhdr_t *ch = NULL;

	 

	if ((chunk = queue->in_progress)) {
		 
		if (chunk->singleton ||
		    chunk->end_of_packet ||
		    chunk->pdiscard) {
			sctp_chunk_free(chunk);
			chunk = queue->in_progress = NULL;
		} else {
			 
			ch = (sctp_chunkhdr_t *) chunk->chunk_end;

			 
			skb_pull(chunk->skb,
				 chunk->chunk_end - chunk->skb->data);
		}
	}

	 
	if (!chunk) {
		struct list_head *entry;

		 
		if (list_empty(&queue->in_chunk_list))
			return NULL;

		entry = queue->in_chunk_list.next;
		chunk = queue->in_progress =
			list_entry(entry, struct sctp_chunk, list);
		list_del_init(entry);

		 
		chunk->singleton = 1;
		ch = (sctp_chunkhdr_t *) chunk->skb->data;
		chunk->data_accepted = 0;
	}

        chunk->chunk_hdr = ch;
        chunk->chunk_end = ((__u8 *)ch) + WORD_ROUND(ntohs(ch->length));
	 
	if (unlikely(skb_is_nonlinear(chunk->skb))) {
		if (chunk->chunk_end > chunk->skb->tail)
			chunk->chunk_end = chunk->skb->tail;
	}
	skb_pull(chunk->skb, sizeof(sctp_chunkhdr_t));
	chunk->subh.v = NULL;  

	if (chunk->chunk_end < chunk->skb->tail) {
		 
		chunk->singleton = 0;
	} else if (chunk->chunk_end > chunk->skb->tail) {
                 
		sctp_chunk_free(chunk);
		chunk = queue->in_progress = NULL;

		return NULL;
	} else {
		 
		chunk->end_of_packet = 1;
	}

	SCTP_DEBUG_PRINTK("+++sctp_inq_pop+++ chunk %p[%s],"
			  " length %d, skb->len %d\n",chunk,
			  sctp_cname(SCTP_ST_CHUNK(chunk->chunk_hdr->type)),
			  ntohs(chunk->chunk_hdr->length), chunk->skb->len);
	return chunk;
}