[DCCP]: Fix seqno setting in dccp_v4_ctl_send_reset

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 1 deletions

diff --git a/net/dccp/ipv4.c b/net/dccp/ipv4.c
index cc5d60d9afa4..02ebf1f39f38 100644
--- a/net/dccp/ipv4.c
+++ b/net/dccp/ipv4.c
@@ -887,6 +887,7 @@ static void dccp_v4_ctl_send_reset(struct sk_buff *rxskb)
                                        sizeof(struct dccp_hdr_reset);
         struct sk_buff *skb;
         struct dst_entry *dst;
+        u64 seqno;
 
         /* Never send a reset in response to a reset. */
         if (rxdh->dccph_type == DCCP_PKT_RESET)
@@ -920,7 +921,12 @@ static void dccp_v4_ctl_send_reset(struct sk_buff *rxskb)
         dccp_hdr_reset(skb)->dccph_reset_code =
                                 DCCP_SKB_CB(rxskb)->dccpd_reset_code;
 
-        dccp_hdr_set_seq(dh, DCCP_SKB_CB(rxskb)->dccpd_ack_seq);
+        /* See "8.3.1. Abnormal Termination" in draft-ietf-dccp-spec-11 */
+        seqno = 0;
+        if (DCCP_SKB_CB(rxskb)->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ)
+                dccp_set_seqno(&seqno, DCCP_SKB_CB(rxskb)->dccpd_ack_seq + 1);
+
+        dccp_hdr_set_seq(dh, seqno);
         dccp_hdr_set_ack(dccp_hdr_ack_bits(skb),
                          DCCP_SKB_CB(rxskb)->dccpd_seq);