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[DCCP]: Update code comments for Step 2/3
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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 <[email protected]>
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
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Gerrit Renker authored and David S. Miller committed Dec 3, 2006
1 parent cf55792 commit d83ca5a
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Showing 4 changed files with 68 additions and 51 deletions.
38 changes: 17 additions & 21 deletions net/dccp/input.c
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Original file line number Diff line number Diff line change
Expand Up @@ -431,29 +431,25 @@ int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,

/*
* Step 3: Process LISTEN state
* (Continuing from dccp_v4_do_rcv and dccp_v6_do_rcv)
*
* 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 an Init
* Cookie. Only the Init Cookie is 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 Cookie
* Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
* 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 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
*/
if (sk->sk_state == DCCP_LISTEN) {
if (dh->dccph_type == DCCP_PKT_REQUEST) {
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38 changes: 18 additions & 20 deletions net/dccp/ipv4.c
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Original file line number Diff line number Diff line change
Expand Up @@ -729,24 +729,23 @@ int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb)

/*
* 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 an Init
* Cookie. Only the Init Cookie is 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 Cookie
* Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
* 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
* 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
Expand Down Expand Up @@ -887,8 +886,6 @@ static int dccp_v4_rcv(struct sk_buff *skb)
/*
* 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 "
Expand Down Expand Up @@ -919,6 +916,7 @@ static int dccp_v4_rcv(struct sk_buff *skb)
goto discard_it;
/*
* Step 2:
* If no socket ...
* Generate Reset(No Connection) unless P.type == Reset
* Drop packet and return
*/
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33 changes: 28 additions & 5 deletions net/dccp/ipv6.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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;
Expand Down Expand Up @@ -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);

Expand Down Expand Up @@ -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 "
Expand Down Expand Up @@ -857,6 +879,7 @@ static int dccp_v6_rcv(struct sk_buff **pskb)
goto discard_it;
/*
* Step 2:
* If no socket ...
* Generate Reset(No Connection) unless P.type == Reset
* Drop packet and return
*/
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10 changes: 5 additions & 5 deletions net/dccp/minisocks.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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);

Expand Down Expand Up @@ -148,9 +148,9 @@ struct sock *dccp_create_openreq_child(struct sock *sk,
/*
* 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 */
Expand Down

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