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[DCCP] CCID: Improve CCID infrastructure

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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>
This commit is contained in:
Arnaldo Carvalho de Melo
2006-03-20 19:21:44 -08:00
committed by David S. Miller
parent f38c39d6ce
commit 91f0ebf7b6
10 changed files with 265 additions and 217 deletions
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55
net/dccp/ccids/ccid2.c
View File

@ -52,16 +52,6 @@ static int ccid2_debug;
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 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
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 @@ static int ccid2_hc_tx_init(struct sock *sk)
/* 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 int ccid2_hc_tx_init(struct sock *sk)
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 void ccid2_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
}
}
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,
};