128 lines
3.2 KiB
C
128 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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