[TCP]: MD5 Signature Option (RFC2385) support.

[linux-drm-fsl-dcu.git] / net / dccp / minisocks.c

diff --git a/net/dccp/minisocks.c b/net/dccp/minisocks.c
index c0349e5b055158d041f2d4ea61da50f090d94f30..3975048d80946ac587b16a3011fa4f34425ac547 100644 (file)
--- a/net/dccp/minisocks.c
+++ b/net/dccp/minisocks.c
@@ -10,8 +10,8 @@
  *     2 of the License, or (at your option) any later version.
  */
 
-#include <linux/config.h>
 #include <linux/dccp.h>
+#include <linux/kernel.h>
 #include <linux/skbuff.h>
 #include <linux/timer.h>
 
@@ -98,8 +98,8 @@ struct sock *dccp_create_openreq_child(struct sock *sk,
        /*
         * Step 3: Process LISTEN state
         *
-        * // Generate a new socket and switch to that socket
-        * Set S := new socket for this port pair
+        *   (* Generate a new socket and switch to that socket *)
+        *   Set S := new socket for this port pair
         */
        struct sock *newsk = inet_csk_clone(sk, req, GFP_ATOMIC);
 
@@ -148,9 +148,9 @@ out_free:
                /*
                 * Step 3: Process LISTEN state
                 *
-                *      Choose S.ISS (initial seqno) or set from Init Cookie
-                *      Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init
-                *      Cookie
+                *    Choose S.ISS (initial seqno) or set from Init Cookies
+                *    Initialize S.GAR := S.ISS
+                *    Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
                 */
 
                /* See dccp_v4_conn_request */
@@ -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);
+               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 */
@@ -244,7 +246,7 @@ listen_overflow:
        DCCP_SKB_CB(skb)->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
 drop:
        if (dccp_hdr(skb)->dccph_type != DCCP_PKT_RESET)
-               req->rsk_ops->send_reset(skb);
+               req->rsk_ops->send_reset(sk, skb);
 
        inet_csk_reqsk_queue_drop(sk, req, prev);
        goto out;
@@ -284,3 +286,21 @@ int dccp_child_process(struct sock *parent, struct sock *child,
 }
 
 EXPORT_SYMBOL_GPL(dccp_child_process);
+
+void dccp_reqsk_send_ack(struct sk_buff *skb, struct request_sock *rsk)
+{
+       pr_info(KERN_WARNING "DCCP: ACK packets are never sent in "
+                            "LISTEN/RESPOND state\n");
+       dump_stack();
+}
+
+EXPORT_SYMBOL_GPL(dccp_reqsk_send_ack);
+
+void dccp_reqsk_init(struct request_sock *req, struct sk_buff *skb)
+{
+       inet_rsk(req)->rmt_port = dccp_hdr(skb)->dccph_sport;
+       inet_rsk(req)->acked    = 0;
+       req->rcv_wnd            = sysctl_dccp_feat_sequence_window;
+}
+
+EXPORT_SYMBOL_GPL(dccp_reqsk_init);