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TCPCT part 1a: add request_values parameter for sending SYNACK

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Add optional function parameters associated with sending SYNACK.
These parameters are not needed after sending SYNACK, and are not
used for retransmission.  Avoids extending struct tcp_request_sock,
and avoids allocating kernel memory.

Also affects DCCP as it uses common struct request_sock_ops,
but this parameter is currently reserved for future use.

Signed-off-by: William.Allen.Simpson@gmail.com
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
William Allen Simpson
2009-12-02 18:07:39 +00:00
committed by David S. Miller
parent e00484023e
commit e6b4d11367
10 changed files with 42 additions and 33 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
net/ipv4/inet_connection_sock.c
View File

@@ -531,7 +531,7 @@ void inet_csk_reqsk_queue_prune(struct sock *parent,
&expire, &resend);
if (!expire &&
(!resend ||
!req->rsk_ops->rtx_syn_ack(parent, req) ||
!req->rsk_ops->rtx_syn_ack(parent, req, NULL) ||
inet_rsk(req)->acked)) {
unsigned long timeo;

18
net/ipv4/tcp_ipv4.c
View File

@@ -742,8 +742,9 @@ static void tcp_v4_reqsk_send_ack(struct sock *sk, struct sk_buff *skb,
* This still operates on a request_sock only, not on a big
* socket.
*/
static int __tcp_v4_send_synack(struct sock *sk, struct request_sock *req,
struct dst_entry *dst)
static int __tcp_v4_send_synack(struct sock *sk, struct dst_entry *dst,
struct request_sock *req,
struct request_values *rvp)
{
const struct inet_request_sock *ireq = inet_rsk(req);
int err = -1;
@@ -753,7 +754,7 @@ static int __tcp_v4_send_synack(struct sock *sk, struct request_sock *req,
if (!dst && (dst = inet_csk_route_req(sk, req)) == NULL)
return -1;
skb = tcp_make_synack(sk, dst, req);
skb = tcp_make_synack(sk, dst, req, rvp);
if (skb) {
struct tcphdr *th = tcp_hdr(skb);
@@ -774,9 +775,10 @@ static int __tcp_v4_send_synack(struct sock *sk, struct request_sock *req,
return err;
}
static int tcp_v4_send_synack(struct sock *sk, struct request_sock *req)
static int tcp_v4_send_synack(struct sock *sk, struct request_sock *req,
struct request_values *rvp)
{
return __tcp_v4_send_synack(sk, req, NULL);
return __tcp_v4_send_synack(sk, NULL, req, rvp);
}
/*
@@ -1211,13 +1213,13 @@ static struct timewait_sock_ops tcp_timewait_sock_ops = {
int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
{
struct inet_request_sock *ireq;
struct tcp_options_received tmp_opt;
struct request_sock *req;
struct inet_request_sock *ireq;
struct dst_entry *dst = NULL;
__be32 saddr = ip_hdr(skb)->saddr;
__be32 daddr = ip_hdr(skb)->daddr;
__u32 isn = TCP_SKB_CB(skb)->when;
struct dst_entry *dst = NULL;
#ifdef CONFIG_SYN_COOKIES
int want_cookie = 0;
#else
@@ -1337,7 +1339,7 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
}
tcp_rsk(req)->snt_isn = isn;
if (__tcp_v4_send_synack(sk, req, dst) || want_cookie)
if (__tcp_v4_send_synack(sk, dst, req, NULL) || want_cookie)
goto drop_and_free;
inet_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT);

2
net/ipv4/tcp_minisocks.c
View File

@@ -531,7 +531,7 @@ struct sock *tcp_check_req(struct sock *sk, struct sk_buff *skb,
* Enforce "SYN-ACK" according to figure 8, figure 6
* of RFC793, fixed by RFC1122.
*/
req->rsk_ops->rtx_syn_ack(sk, req);
req->rsk_ops->rtx_syn_ack(sk, req, NULL);
return NULL;
}

3
net/ipv4/tcp_output.c
View File

@@ -2224,7 +2224,8 @@ int tcp_send_synack(struct sock *sk)
/* Prepare a SYN-ACK. */
struct sk_buff *tcp_make_synack(struct sock *sk, struct dst_entry *dst,
struct request_sock *req)
struct request_sock *req,
struct request_values *rvp)
{
struct inet_request_sock *ireq = inet_rsk(req);
struct tcp_sock *tp = tcp_sk(sk);