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authorGerrit Renker <gerrit@erg.abdn.ac.uk>2006-11-13 15:07:51 (GMT)
committerDavid S. Miller <davem@sunset.davemloft.net>2006-12-03 05:22:16 (GMT)
commit08a29e41bb6d6516b0f65e19381f537168d1768e (patch)
tree618fab853176e620311c495959e038018fb14d8e
parent75356f27ed4f85bd789a822bca3fc5e92e334140 (diff)
downloadlinux-08a29e41bb6d6516b0f65e19381f537168d1768e.tar.xz
[DCCP]: Update comments on precisely which packets can be retransmitted
This updates program documentation: spell out precise conditions about which packets are eligible for retransmission (which is actually quite hard to extract from RFC 4340). It is based on the following table derived from RFC 4340: +-----------+---------------------------------+---------------------+ | Type | Retransmit? | Remark | +-----------+---------------------------------+---------------------+ | Request | in client-REQUEST state | sec. 8.1.1 | | Response | NEVER | SHOULD NOT, 8.1.3 | | Data | NEVER | unreliable protocol | | Ack | possible in client-PARTOPEN | sec. 8.1.5 | | DataAck | NEVER | unreliable protocol | | CloseReq | only in server-CLOSEREQ state | MUST, sec. 8.3 | | Close | in node-CLOSING state | MUST, sec. 8.3 | +-----------+-------------------------------------------------------+ | Reset | only in response to other packets | | Sync | only in response to sequence-invalid packets (7.5.4) | | SyncAck | only in response to Sync packets | +-----------+-------------------------------------------------------+ Hence the only packets eligible for retransmission are: * Requests in client-REQUEST state (sec. 8.1.1) * Acks in client-PARTOPEN state (sec. 8.1.5) * CloseReq in server-CLOSEREQ state (sec. 8.3) * Close in node-CLOSING state (sec. 8.3) I had meant to put in a check for these types too, but have left that for later. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
-rw-r--r--net/dccp/timer.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/net/dccp/timer.c b/net/dccp/timer.c
index 8447742..bda0af6 100644
--- a/net/dccp/timer.c
+++ b/net/dccp/timer.c
@@ -142,7 +142,7 @@ static void dccp_retransmit_timer(struct sock *sk)
/* retransmit timer is used for feature negotiation throughout
* connection. In this case, no packet is re-transmitted, but rather an
- * ack is generated and pending changes are splaced into its options.
+ * ack is generated and pending changes are placed into its options.
*/
if (sk->sk_send_head == NULL) {
dccp_pr_debug("feat negotiation retransmit timeout %p\n", sk);
@@ -154,9 +154,11 @@ static void dccp_retransmit_timer(struct sock *sk)
/*
* sk->sk_send_head has to have one skb with
* DCCP_SKB_CB(skb)->dccpd_type set to one of the retransmittable DCCP
- * packet types (REQUEST, RESPONSE, the ACK in the 3way handshake
- * (PARTOPEN timer), etc).
- */
+ * packet types. The only packets eligible for retransmission are:
+ * -- Requests in client-REQUEST state (sec. 8.1.1)
+ * -- Acks in client-PARTOPEN state (sec. 8.1.5)
+ * -- CloseReq in server-CLOSEREQ state (sec. 8.3)
+ * -- Close in node-CLOSING state (sec. 8.3) */
BUG_TRAP(sk->sk_send_head != NULL);
/*