[DCCP]: Update code comments for Step 2/3

[linux-2.6] / net / dccp / ipv6.c

diff --git a/net/dccp/ipv6.c b/net/dccp/ipv6.c
index 19a4f763099d81036027fc36ed4bc5d53152442b..201801e1532d8d33c7705f07952f70c0f880f979 100644 (file)
--- a/net/dccp/ipv6.c
+++ b/net/dccp/ipv6.c
@@ -487,10 +487,10 @@ static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
        /*
         * Step 3: Process LISTEN state
         *
-        * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
+        *   Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
         *
-        * In fact we defer setting S.GSR, S.SWL, S.SWH to
-        * dccp_create_openreq_child.
+        *   In fact we defer setting S.GSR, S.SWL, S.SWH to
+        *   dccp_create_openreq_child.
         */
        dreq = dccp_rsk(req);
        dreq->dreq_isr     = dcb->dccpd_seq;
@@ -760,6 +760,30 @@ static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
                return 0;
        }
 
+       /*
+        *  Step 3: Process LISTEN state
+        *     If S.state == LISTEN,
+        *       If P.type == Request or P contains a valid Init Cookie option,
+        *            (* Must scan the packet's options to check for Init
+        *               Cookies.  Only Init Cookies are processed here,
+        *               however; other options are processed in Step 8.  This
+        *               scan need only be performed if the endpoint uses Init
+        *               Cookies *)
+        *            (* Generate a new socket and switch to that socket *)
+        *            Set S := new socket for this port pair
+        *            S.state = RESPOND
+        *            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
+        *            Continue with S.state == RESPOND
+        *            (* A Response packet will be generated in Step 11 *)
+        *       Otherwise,
+        *            Generate Reset(No Connection) unless P.type == Reset
+        *            Drop packet and return
+        *
+        * NOTE: the check for the packet types is done in
+        *       dccp_rcv_state_process
+        */
        if (sk->sk_state == DCCP_LISTEN) {
                struct sock *nsk = dccp_v6_hnd_req(sk, skb);
 
@@ -826,8 +850,6 @@ static int dccp_v6_rcv(struct sk_buff **pskb)
        /*
         * Step 2:
         *      If no socket ...
-        *              Generate Reset(No Connection) unless P.type == Reset
-        *              Drop packet and return
         */
        if (sk == NULL) {
                dccp_pr_debug("failed to look up flow ID in table and "
@@ -857,6 +879,7 @@ no_dccp_socket:
                goto discard_it;
        /*
         * Step 2:
+        *      If no socket ...
         *              Generate Reset(No Connection) unless P.type == Reset
         *              Drop packet and return
         */