[DCCP] feat: Actually change the CCID upon negotiation
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>
diff --git a/net/dccp/feat.c b/net/dccp/feat.c
index 99d7b7f..ed0851f 100644
--- a/net/dccp/feat.c
+++ b/net/dccp/feat.c
@@ -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 @@
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 @@
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;
}