From e6b4d11367519bc71729c09d05a126b133c755be Mon Sep 17 00:00:00 2001 From: William Allen Simpson Date: Wed, 2 Dec 2009 18:07:39 +0000 Subject: TCPCT part 1a: add request_values parameter for sending SYNACK 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 Signed-off-by: David S. Miller --- net/ipv4/inet_connection_sock.c | 2 +- net/ipv4/tcp_ipv4.c | 18 ++++++++++-------- net/ipv4/tcp_minisocks.c | 2 +- net/ipv4/tcp_output.c | 3 ++- 4 files changed, 14 insertions(+), 11 deletions(-) (limited to 'net/ipv4') diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c index 9b35c56..ee16475 100644 --- a/net/ipv4/inet_connection_sock.c +++ b/net/ipv4/inet_connection_sock.c @@ -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; diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index df18ce0..649a36d 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -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); diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c index ab32c18..d3f6bbf 100644 --- a/net/ipv4/tcp_minisocks.c +++ b/net/ipv4/tcp_minisocks.c @@ -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; } diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index 875bc6d..b8b2504 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -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); -- cgit v1.1