]>
git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - include/net/tcp_ecn.h
1 #ifndef _NET_TCP_ECN_H_
2 #define _NET_TCP_ECN_H_ 1
4 #include <net/inet_ecn.h>
5 #include <net/request_sock.h>
7 #define TCP_HP_BITS (~(TCP_RESERVED_BITS|TCP_FLAG_PSH))
10 #define TCP_ECN_QUEUE_CWR 2
11 #define TCP_ECN_DEMAND_CWR 4
13 static inline void TCP_ECN_queue_cwr(struct tcp_sock
*tp
)
15 if (tp
->ecn_flags
&TCP_ECN_OK
)
16 tp
->ecn_flags
|= TCP_ECN_QUEUE_CWR
;
20 /* Output functions */
22 static inline void TCP_ECN_send_synack(struct tcp_sock
*tp
,
25 TCP_SKB_CB(skb
)->flags
&= ~TCPCB_FLAG_CWR
;
26 if (!(tp
->ecn_flags
&TCP_ECN_OK
))
27 TCP_SKB_CB(skb
)->flags
&= ~TCPCB_FLAG_ECE
;
30 static inline void TCP_ECN_send_syn(struct sock
*sk
, struct tcp_sock
*tp
,
35 TCP_SKB_CB(skb
)->flags
|= TCPCB_FLAG_ECE
|TCPCB_FLAG_CWR
;
36 tp
->ecn_flags
= TCP_ECN_OK
;
40 static __inline__
void
41 TCP_ECN_make_synack(struct request_sock
*req
, struct tcphdr
*th
)
43 if (inet_rsk(req
)->ecn_ok
)
47 static inline void TCP_ECN_send(struct sock
*sk
, struct tcp_sock
*tp
,
48 struct sk_buff
*skb
, int tcp_header_len
)
50 if (tp
->ecn_flags
& TCP_ECN_OK
) {
51 /* Not-retransmitted data segment: set ECT and inject CWR. */
52 if (skb
->len
!= tcp_header_len
&&
53 !before(TCP_SKB_CB(skb
)->seq
, tp
->snd_nxt
)) {
55 if (tp
->ecn_flags
&TCP_ECN_QUEUE_CWR
) {
56 tp
->ecn_flags
&= ~TCP_ECN_QUEUE_CWR
;
58 if (skb_shinfo(skb
)->gso_type
& SKB_GSO_TCPV4
)
59 skb_shinfo(skb
)->gso_type
|=
63 /* ACK or retransmitted segment: clear ECT|CE */
64 INET_ECN_dontxmit(sk
);
66 if (tp
->ecn_flags
& TCP_ECN_DEMAND_CWR
)
73 static inline void TCP_ECN_accept_cwr(struct tcp_sock
*tp
, struct sk_buff
*skb
)
76 tp
->ecn_flags
&= ~TCP_ECN_DEMAND_CWR
;
79 static inline void TCP_ECN_withdraw_cwr(struct tcp_sock
*tp
)
81 tp
->ecn_flags
&= ~TCP_ECN_DEMAND_CWR
;
84 static inline void TCP_ECN_check_ce(struct tcp_sock
*tp
, struct sk_buff
*skb
)
86 if (tp
->ecn_flags
&TCP_ECN_OK
) {
87 if (INET_ECN_is_ce(TCP_SKB_CB(skb
)->flags
))
88 tp
->ecn_flags
|= TCP_ECN_DEMAND_CWR
;
89 /* Funny extension: if ECT is not set on a segment,
90 * it is surely retransmit. It is not in ECN RFC,
91 * but Linux follows this rule. */
92 else if (INET_ECN_is_not_ect((TCP_SKB_CB(skb
)->flags
)))
93 tcp_enter_quickack_mode((struct sock
*)tp
);
97 static inline void TCP_ECN_rcv_synack(struct tcp_sock
*tp
, struct tcphdr
*th
)
99 if ((tp
->ecn_flags
&TCP_ECN_OK
) && (!th
->ece
|| th
->cwr
))
100 tp
->ecn_flags
&= ~TCP_ECN_OK
;
103 static inline void TCP_ECN_rcv_syn(struct tcp_sock
*tp
, struct tcphdr
*th
)
105 if ((tp
->ecn_flags
&TCP_ECN_OK
) && (!th
->ece
|| !th
->cwr
))
106 tp
->ecn_flags
&= ~TCP_ECN_OK
;
109 static inline int TCP_ECN_rcv_ecn_echo(struct tcp_sock
*tp
, struct tcphdr
*th
)
111 if (th
->ece
&& !th
->syn
&& (tp
->ecn_flags
&TCP_ECN_OK
))
116 static inline void TCP_ECN_openreq_child(struct tcp_sock
*tp
,
117 struct request_sock
*req
)
119 tp
->ecn_flags
= inet_rsk(req
)->ecn_ok
? TCP_ECN_OK
: 0;
122 static __inline__
void
123 TCP_ECN_create_request(struct request_sock
*req
, struct tcphdr
*th
)
125 if (sysctl_tcp_ecn
&& th
->ece
&& th
->cwr
)
126 inet_rsk(req
)->ecn_ok
= 1;