[NET]: Introduce inet_connection_sock

This creates struct inet_connection_sock, moving members out of struct
tcp_sock that are shareable with other INET connection oriented
protocols, such as DCCP, that in my private tree already uses most of
these members.

The functions that operate on these members were renamed, using a
inet_csk_ prefix while not being moved yet to a new file, so as to
ease the review of these changes.

Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 15 insertions, 13 deletions

diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c
index 8b6cd8d80662..56823704eb7d 100644
--- a/net/ipv4/tcp_minisocks.c
+++ b/net/ipv4/tcp_minisocks.c
@@ -271,7 +271,8 @@ void tcp_time_wait(struct sock *sk, int state, int timeo)
 
         if (tw != NULL) {
                 struct tcp_timewait_sock *tcptw = tcp_twsk((struct sock *)tw);
-                const int rto = (tp->rto << 2) - (tp->rto >> 1);
+                const struct inet_connection_sock *icsk = inet_csk(sk);
+                const int rto = (icsk->icsk_rto << 2) - (icsk->icsk_rto >> 1);
 
                 tw->tw_rcv_wscale       = tp->rx_opt.rcv_wscale;
                 tcptw->tw_rcv_nxt       = tp->rcv_nxt;
@@ -605,10 +606,11 @@ struct sock *tcp_create_openreq_child(struct sock *sk, struct request_sock *req,
                 struct inet_request_sock *ireq = inet_rsk(req);
                 struct tcp_request_sock *treq = tcp_rsk(req);
                 struct inet_sock *newinet = inet_sk(newsk);
+                struct inet_connection_sock *newicsk = inet_csk(newsk);
                 struct tcp_sock *newtp;
 
                 newsk->sk_state = TCP_SYN_RECV;
-                newinet->bind_hash = NULL;
+                newicsk->icsk_bind_hash = NULL;
 
                 /* Clone the TCP header template */
                 newinet->dport = ireq->rmt_port;
@@ -624,11 +626,11 @@ struct sock *tcp_create_openreq_child(struct sock *sk, struct request_sock *req,
 
                 tcp_init_wl(newtp, treq->snt_isn, treq->rcv_isn);
 
-                newtp->retransmits = 0;
-                newtp->backoff = 0;
+                newicsk->icsk_retransmits = 0;
+                newicsk->icsk_backoff = 0;
                 newtp->srtt = 0;
                 newtp->mdev = TCP_TIMEOUT_INIT;
-                newtp->rto = TCP_TIMEOUT_INIT;
+                newicsk->icsk_rto = TCP_TIMEOUT_INIT;
 
                 newtp->packets_out = 0;
                 newtp->left_out = 0;
@@ -667,11 +669,11 @@ struct sock *tcp_create_openreq_child(struct sock *sk, struct request_sock *req,
                 newtp->rx_opt.num_sacks = 0;
                 newtp->urg_data = 0;
                 /* Deinitialize accept_queue to trap illegal accesses. */
-                memset(&newtp->accept_queue, 0, sizeof(newtp->accept_queue));
+                memset(&newicsk->icsk_accept_queue, 0, sizeof(newicsk->icsk_accept_queue));
 
                 if (sock_flag(newsk, SOCK_KEEPOPEN))
-                        tcp_reset_keepalive_timer(newsk,
-                                                  keepalive_time_when(newtp));
+                        inet_csk_reset_keepalive_timer(newsk,
+                                                       keepalive_time_when(newtp));
 
                 newtp->rx_opt.tstamp_ok = ireq->tstamp_ok;
                 if((newtp->rx_opt.sack_ok = ireq->sack_ok) != 0) {
@@ -701,7 +703,7 @@ struct sock *tcp_create_openreq_child(struct sock *sk, struct request_sock *req,
                         newtp->tcp_header_len = sizeof(struct tcphdr);
                 }
                 if (skb->len >= TCP_MIN_RCVMSS+newtp->tcp_header_len)
-                        newtp->ack.last_seg_size = skb->len-newtp->tcp_header_len;
+                        newicsk->icsk_ack.last_seg_size = skb->len - newtp->tcp_header_len;
                 newtp->rx_opt.mss_clamp = req->mss;
                 TCP_ECN_openreq_child(newtp, req);
                 if (newtp->ecn_flags&TCP_ECN_OK)
@@ -881,10 +883,10 @@ struct sock *tcp_check_req(struct sock *sk,struct sk_buff *skb,
                 if (child == NULL)
                         goto listen_overflow;
 
-                tcp_synq_unlink(tp, req, prev);
-                tcp_synq_removed(sk, req);
+                inet_csk_reqsk_queue_unlink(sk, req, prev);
+                inet_csk_reqsk_queue_removed(sk, req);
 
-                tcp_acceptq_queue(sk, req, child);
+                inet_csk_reqsk_queue_add(sk, req, child);
                 return child;
 
         listen_overflow:
@@ -898,7 +900,7 @@ struct sock *tcp_check_req(struct sock *sk,struct sk_buff *skb,
                 if (!(flg & TCP_FLAG_RST))
                         req->rsk_ops->send_reset(skb);
 
-                tcp_synq_drop(sk, req, prev);
+                inet_csk_reqsk_queue_drop(sk, req, prev);
                 return NULL;
 }