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authorGerrit Renker <gerrit@erg.abdn.ac.uk>2006-11-10 16:29:14 -0200
committerDavid S. Miller <davem@sunset.davemloft.net>2006-12-02 21:22:04 -0800
commitd83ca5accb256de1b44835cd222bfdc3207bd7dc (patch)
treec7be8b1f61d4403fe15bd279ecf9d52619134592 /net/dccp/ipv6.c
parentcf557926f6955b4c3fa55e81fdb3675e752e8eed (diff)
downloadlinux-d83ca5accb256de1b44835cd222bfdc3207bd7dc.tar.bz2
[DCCP]: Update code comments for Step 2/3
Sorts out the comments for processing steps 2,3 in section 8.5 of RFC 4340. All comments have been updated against this document, and the reference to step 2 has been made consistent throughout the files. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Diffstat (limited to 'net/dccp/ipv6.c')
-rw-r--r--net/dccp/ipv6.c33
1 files changed, 28 insertions, 5 deletions
diff --git a/net/dccp/ipv6.c b/net/dccp/ipv6.c
index 19a4f763099d..201801e1532d 100644
--- 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
*/