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[DCCP] feat: Actually change the CCID upon negotiation

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Change the CCID upon successful feature negotiation.

Commiter note: patch mostly rewritten to use the new ccid API.

Signed-off-by: Andrea Bittau <a.bittau@cs.ucl.ac.uk>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrea Bittau 2006-03-20 19:22:37 -08:00 committed by David S. Miller
parent 91f0ebf7b6
commit 6ffd30fbbb
1 changed files with 42 additions and 1 deletions
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43
net/dccp/feat.c
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@ -14,6 +14,7 @@
#include <linux/module.h>
#include "dccp.h"
#include "ccid.h"
#include "feat.h"
#define DCCP_FEAT_SP_NOAGREE (-123)
@ -26,6 +27,8 @@ int dccp_feat_change(struct sock *sk, u8 type, u8 feature, u8 *val, u8 len,
dccp_pr_debug("feat change type=%d feat=%d\n", type, feature);
/* XXX sanity check feat change request */
/* check if that feature is already being negotiated */
list_for_each_entry(opt, &dp->dccps_options.dccpo_pending,
dccpop_node) {
@ -62,11 +65,49 @@ int dccp_feat_change(struct sock *sk, u8 type, u8 feature, u8 *val, u8 len,
EXPORT_SYMBOL_GPL(dccp_feat_change);
static int dccp_feat_update_ccid(struct sock *sk, u8 type, u8 new_ccid_nr)
{
struct dccp_sock *dp = dccp_sk(sk);
/* figure out if we are changing our CCID or the peer's */
const int rx = type == DCCPO_CHANGE_R;
const u8 ccid_nr = rx ? dp->dccps_options.dccpo_rx_ccid :
dp->dccps_options.dccpo_tx_ccid;
struct ccid *new_ccid;
/* Check if nothing is being changed. */
if (ccid_nr == new_ccid_nr)
return 0;
new_ccid = ccid_new(new_ccid_nr, sk, rx, GFP_ATOMIC);
if (new_ccid == NULL)
return -ENOMEM;
if (rx) {
ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk);
dp->dccps_hc_rx_ccid = new_ccid;
dp->dccps_options.dccpo_rx_ccid = new_ccid_nr;
} else {
ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk);
dp->dccps_hc_tx_ccid = new_ccid;
dp->dccps_options.dccpo_tx_ccid = new_ccid_nr;
}
return 0;
}
/* XXX taking only u8 vals */
static int dccp_feat_update(struct sock *sk, u8 type, u8 feat, u8 val)
{
/* FIXME implement */
dccp_pr_debug("changing [%d] feat %d to %d\n", type, feat, val);
switch (feat) {
case DCCPF_CCID:
return dccp_feat_update_ccid(sk, type, val);
default:
dccp_pr_debug("IMPLEMENT changing [%d] feat %d to %d\n",
type, feat, val);
break;
}
return 0;
}