[DCCP] CCID: Improve CCID infrastructure
1. No need for ->ccid_init nor ->ccid_exit, this is what module_{init,exit}
does and anynways neither ccid2 nor ccid3 were using it.
2. Rename struct ccid to struct ccid_operations and introduce struct ccid
with a pointer to ccid_operations and rigth after it the rx or tx
private state.
3. Remove the pointer to the state of the half connections from struct
dccp_sock, now its derived thru ccid_priv() from the ccid pointer.
Now we also can implement the setsockopt for changing the CCID easily as
no ccid init routines can affect struct dccp_sock in any way that prevents
other CCIDs from working if a CCID switch operation is asked by apps.
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/dccp/ccids/ccid2.c b/net/dccp/ccids/ccid2.c
index 3328d23..b40c456 100644
--- a/net/dccp/ccids/ccid2.c
+++ b/net/dccp/ccids/ccid2.c
@@ -52,16 +52,6 @@
static const int ccid2_seq_len = 128;
-static inline struct ccid2_hc_tx_sock *ccid2_hc_tx_sk(const struct sock *sk)
-{
- return dccp_sk(sk)->dccps_hc_tx_ccid_private;
-}
-
-static inline struct ccid2_hc_rx_sock *ccid2_hc_rx_sk(const struct sock *sk)
-{
- return dccp_sk(sk)->dccps_hc_rx_ccid_private;
-}
-
#ifdef CCID2_DEBUG
static void ccid2_hc_tx_check_sanity(const struct ccid2_hc_tx_sock *hctx)
{
@@ -707,19 +697,12 @@
ccid2_hc_tx_check_sanity(hctx);
}
-static int ccid2_hc_tx_init(struct sock *sk)
+static int ccid2_hc_tx_init(struct ccid *ccid, struct sock *sk)
{
- struct dccp_sock *dp = dccp_sk(sk);
- struct ccid2_hc_tx_sock *hctx;
+ struct ccid2_hc_tx_sock *hctx = ccid_priv(ccid);
int seqcount = ccid2_seq_len;
int i;
- dp->dccps_hc_tx_ccid_private = kzalloc(sizeof(*hctx), gfp_any());
- if (dp->dccps_hc_tx_ccid_private == NULL)
- return -ENOMEM;
-
- hctx = ccid2_hc_tx_sk(sk);
-
/* XXX init variables with proper values */
hctx->ccid2hctx_cwnd = 1;
hctx->ccid2hctx_ssthresh = 10;
@@ -728,11 +711,9 @@
/* XXX init ~ to window size... */
hctx->ccid2hctx_seqbuf = kmalloc(sizeof(*hctx->ccid2hctx_seqbuf) *
seqcount, gfp_any());
- if (hctx->ccid2hctx_seqbuf == NULL) {
- kfree(dp->dccps_hc_tx_ccid_private);
- dp->dccps_hc_tx_ccid_private = NULL;
+ if (hctx->ccid2hctx_seqbuf == NULL)
return -ENOMEM;
- }
+
for (i = 0; i < (seqcount - 1); i++) {
hctx->ccid2hctx_seqbuf[i].ccid2s_next =
&hctx->ccid2hctx_seqbuf[i + 1];
@@ -763,15 +744,11 @@
static void ccid2_hc_tx_exit(struct sock *sk)
{
- struct dccp_sock *dp = dccp_sk(sk);
struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);
ccid2_hc_tx_kill_rto_timer(sk);
-
kfree(hctx->ccid2hctx_seqbuf);
-
- kfree(dp->dccps_hc_tx_ccid_private);
- dp->dccps_hc_tx_ccid_private = NULL;
+ hctx->ccid2hctx_seqbuf = NULL;
}
static void ccid2_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
@@ -791,33 +768,17 @@
}
}
-static int ccid2_hc_rx_init(struct sock *sk)
-{
- struct dccp_sock *dp = dccp_sk(sk);
- dp->dccps_hc_rx_ccid_private = kzalloc(sizeof(struct ccid2_hc_rx_sock),
- gfp_any());
- return dp->dccps_hc_rx_ccid_private == NULL ? -ENOMEM : 0;
-}
-
-static void ccid2_hc_rx_exit(struct sock *sk)
-{
- struct dccp_sock *dp = dccp_sk(sk);
-
- kfree(dp->dccps_hc_rx_ccid_private);
- dp->dccps_hc_rx_ccid_private = NULL;
-}
-
-static struct ccid ccid2 = {
+static struct ccid_operations ccid2 = {
.ccid_id = 2,
.ccid_name = "ccid2",
.ccid_owner = THIS_MODULE,
+ .ccid_hc_tx_obj_size = sizeof(struct ccid2_hc_tx_sock),
.ccid_hc_tx_init = ccid2_hc_tx_init,
.ccid_hc_tx_exit = ccid2_hc_tx_exit,
.ccid_hc_tx_send_packet = ccid2_hc_tx_send_packet,
.ccid_hc_tx_packet_sent = ccid2_hc_tx_packet_sent,
.ccid_hc_tx_packet_recv = ccid2_hc_tx_packet_recv,
- .ccid_hc_rx_init = ccid2_hc_rx_init,
- .ccid_hc_rx_exit = ccid2_hc_rx_exit,
+ .ccid_hc_rx_obj_size = sizeof(struct ccid2_hc_rx_sock),
.ccid_hc_rx_packet_recv = ccid2_hc_rx_packet_recv,
};