[DCCP]: Increment sequence numbers on retransmitted Response packets (e11d9d30) · Commits · e / devices / android_kernel_teracube_2e

net/dccp/minisocks.c

+9 −7

Original line number	Diff line number	Diff line
		@@ -196,15 +196,17 @@ struct sock dccp_check_req(struct sock sk, struct sk_buff *skb,

		/* Check for retransmitted REQUEST */
		if (dccp_hdr(skb)->dccph_type == DCCP_PKT_REQUEST) {
		if (after48(DCCP_SKB_CB(skb)->dccpd_seq,
		dccp_rsk(req)->dreq_isr)) {
		struct dccp_request_sock *dreq = dccp_rsk(req);

		if (after48(DCCP_SKB_CB(skb)->dccpd_seq, dreq->dreq_isr)) {
		dccp_pr_debug("Retransmitted REQUEST\n");
		/* Send another RESPONSE packet */
		dccp_set_seqno(&dreq->dreq_iss, dreq->dreq_iss + 1);
		dccp_set_seqno(&dreq->dreq_isr,
		DCCP_SKB_CB(skb)->dccpd_seq);
		dreq->dreq_isr = DCCP_SKB_CB(skb)->dccpd_seq;
		/*
		* Send another RESPONSE packet
		* To protect against Request floods, increment retrans
		* counter (backoff, monitored by dccp_response_timer).
		*/
		req->retrans++;
		req->rsk_ops->rtx_syn_ack(sk, req, NULL);
		}
		/* Network Duplicate, discard packet */

+4 −0

Original line number	Diff line number	Diff line
		@@ -332,6 +332,8 @@ struct sk_buff dccp_make_response(struct sock sk, struct dst_entry *dst,
		skb->dst = dst_clone(dst);

		dreq = dccp_rsk(req);
		if (inet_rsk(req)->acked) /* increase ISS upon retransmission */
		dccp_inc_seqno(&dreq->dreq_iss);
		DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_RESPONSE;
		DCCP_SKB_CB(skb)->dccpd_seq = dreq->dreq_iss;

		@@ -354,6 +356,8 @@ struct sk_buff dccp_make_response(struct sock sk, struct dst_entry *dst,

		dccp_csum_outgoing(skb);

		/* We use `acked' to remember that a Response was already sent. */
		inet_rsk(req)->acked = 1;
		DCCP_INC_STATS(DCCP_MIB_OUTSEGS);
		return skb;
		}