463c84b97f
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>
127 lines
3.2 KiB
C
127 lines
3.2 KiB
C
#ifndef _NET_TCP_ECN_H_
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#define _NET_TCP_ECN_H_ 1
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#include <net/inet_ecn.h>
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#include <net/request_sock.h>
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#define TCP_HP_BITS (~(TCP_RESERVED_BITS|TCP_FLAG_PSH))
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#define TCP_ECN_OK 1
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#define TCP_ECN_QUEUE_CWR 2
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#define TCP_ECN_DEMAND_CWR 4
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static inline void TCP_ECN_queue_cwr(struct tcp_sock *tp)
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{
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if (tp->ecn_flags&TCP_ECN_OK)
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tp->ecn_flags |= TCP_ECN_QUEUE_CWR;
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}
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/* Output functions */
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static inline void TCP_ECN_send_synack(struct tcp_sock *tp,
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struct sk_buff *skb)
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{
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TCP_SKB_CB(skb)->flags &= ~TCPCB_FLAG_CWR;
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if (!(tp->ecn_flags&TCP_ECN_OK))
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TCP_SKB_CB(skb)->flags &= ~TCPCB_FLAG_ECE;
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}
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static inline void TCP_ECN_send_syn(struct sock *sk, struct tcp_sock *tp,
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struct sk_buff *skb)
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{
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tp->ecn_flags = 0;
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if (sysctl_tcp_ecn && !(sk->sk_route_caps & NETIF_F_TSO)) {
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TCP_SKB_CB(skb)->flags |= TCPCB_FLAG_ECE|TCPCB_FLAG_CWR;
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tp->ecn_flags = TCP_ECN_OK;
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sock_set_flag(sk, SOCK_NO_LARGESEND);
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}
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}
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static __inline__ void
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TCP_ECN_make_synack(struct request_sock *req, struct tcphdr *th)
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{
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if (inet_rsk(req)->ecn_ok)
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th->ece = 1;
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}
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static inline void TCP_ECN_send(struct sock *sk, struct tcp_sock *tp,
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struct sk_buff *skb, int tcp_header_len)
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{
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if (tp->ecn_flags & TCP_ECN_OK) {
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/* Not-retransmitted data segment: set ECT and inject CWR. */
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if (skb->len != tcp_header_len &&
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!before(TCP_SKB_CB(skb)->seq, tp->snd_nxt)) {
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INET_ECN_xmit(sk);
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if (tp->ecn_flags&TCP_ECN_QUEUE_CWR) {
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tp->ecn_flags &= ~TCP_ECN_QUEUE_CWR;
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skb->h.th->cwr = 1;
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}
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} else {
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/* ACK or retransmitted segment: clear ECT|CE */
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INET_ECN_dontxmit(sk);
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}
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if (tp->ecn_flags & TCP_ECN_DEMAND_CWR)
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skb->h.th->ece = 1;
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}
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}
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/* Input functions */
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static inline void TCP_ECN_accept_cwr(struct tcp_sock *tp, struct sk_buff *skb)
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{
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if (skb->h.th->cwr)
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tp->ecn_flags &= ~TCP_ECN_DEMAND_CWR;
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}
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static inline void TCP_ECN_withdraw_cwr(struct tcp_sock *tp)
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{
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tp->ecn_flags &= ~TCP_ECN_DEMAND_CWR;
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}
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static inline void TCP_ECN_check_ce(struct tcp_sock *tp, struct sk_buff *skb)
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{
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if (tp->ecn_flags&TCP_ECN_OK) {
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if (INET_ECN_is_ce(TCP_SKB_CB(skb)->flags))
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tp->ecn_flags |= TCP_ECN_DEMAND_CWR;
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/* Funny extension: if ECT is not set on a segment,
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* it is surely retransmit. It is not in ECN RFC,
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* but Linux follows this rule. */
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else if (INET_ECN_is_not_ect((TCP_SKB_CB(skb)->flags)))
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tcp_enter_quickack_mode((struct sock *)tp);
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}
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}
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static inline void TCP_ECN_rcv_synack(struct tcp_sock *tp, struct tcphdr *th)
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{
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if ((tp->ecn_flags&TCP_ECN_OK) && (!th->ece || th->cwr))
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tp->ecn_flags &= ~TCP_ECN_OK;
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}
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static inline void TCP_ECN_rcv_syn(struct tcp_sock *tp, struct tcphdr *th)
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{
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if ((tp->ecn_flags&TCP_ECN_OK) && (!th->ece || !th->cwr))
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tp->ecn_flags &= ~TCP_ECN_OK;
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}
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static inline int TCP_ECN_rcv_ecn_echo(struct tcp_sock *tp, struct tcphdr *th)
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{
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if (th->ece && !th->syn && (tp->ecn_flags&TCP_ECN_OK))
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return 1;
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return 0;
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}
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static inline void TCP_ECN_openreq_child(struct tcp_sock *tp,
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struct request_sock *req)
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{
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tp->ecn_flags = inet_rsk(req)->ecn_ok ? TCP_ECN_OK : 0;
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}
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static __inline__ void
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TCP_ECN_create_request(struct request_sock *req, struct tcphdr *th)
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{
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if (sysctl_tcp_ecn && th->ece && th->cwr)
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inet_rsk(req)->ecn_ok = 1;
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}
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#endif
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