]> git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - include/net/tcp_ecn.h
Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mfashe...
[mirror_ubuntu-zesty-kernel.git] / include / net / tcp_ecn.h
1 #ifndef _NET_TCP_ECN_H_
2 #define _NET_TCP_ECN_H_ 1
3
4 #include <net/inet_ecn.h>
5 #include <net/request_sock.h>
6
7 #define TCP_HP_BITS (~(TCP_RESERVED_BITS|TCP_FLAG_PSH))
8
9 #define TCP_ECN_OK 1
10 #define TCP_ECN_QUEUE_CWR 2
11 #define TCP_ECN_DEMAND_CWR 4
12
13 static inline void TCP_ECN_queue_cwr(struct tcp_sock *tp)
14 {
15 if (tp->ecn_flags&TCP_ECN_OK)
16 tp->ecn_flags |= TCP_ECN_QUEUE_CWR;
17 }
18
19
20 /* Output functions */
21
22 static inline void TCP_ECN_send_synack(struct tcp_sock *tp,
23 struct sk_buff *skb)
24 {
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;
28 }
29
30 static inline void TCP_ECN_send_syn(struct sock *sk, struct tcp_sock *tp,
31 struct sk_buff *skb)
32 {
33 tp->ecn_flags = 0;
34 if (sysctl_tcp_ecn) {
35 TCP_SKB_CB(skb)->flags |= TCPCB_FLAG_ECE|TCPCB_FLAG_CWR;
36 tp->ecn_flags = TCP_ECN_OK;
37 }
38 }
39
40 static __inline__ void
41 TCP_ECN_make_synack(struct request_sock *req, struct tcphdr *th)
42 {
43 if (inet_rsk(req)->ecn_ok)
44 th->ece = 1;
45 }
46
47 static inline void TCP_ECN_send(struct sock *sk, struct tcp_sock *tp,
48 struct sk_buff *skb, int tcp_header_len)
49 {
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)) {
54 INET_ECN_xmit(sk);
55 if (tp->ecn_flags&TCP_ECN_QUEUE_CWR) {
56 tp->ecn_flags &= ~TCP_ECN_QUEUE_CWR;
57 skb->h.th->cwr = 1;
58 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
59 skb_shinfo(skb)->gso_type |=
60 SKB_GSO_TCPV4_ECN;
61 }
62 } else {
63 /* ACK or retransmitted segment: clear ECT|CE */
64 INET_ECN_dontxmit(sk);
65 }
66 if (tp->ecn_flags & TCP_ECN_DEMAND_CWR)
67 skb->h.th->ece = 1;
68 }
69 }
70
71 /* Input functions */
72
73 static inline void TCP_ECN_accept_cwr(struct tcp_sock *tp, struct sk_buff *skb)
74 {
75 if (skb->h.th->cwr)
76 tp->ecn_flags &= ~TCP_ECN_DEMAND_CWR;
77 }
78
79 static inline void TCP_ECN_withdraw_cwr(struct tcp_sock *tp)
80 {
81 tp->ecn_flags &= ~TCP_ECN_DEMAND_CWR;
82 }
83
84 static inline void TCP_ECN_check_ce(struct tcp_sock *tp, struct sk_buff *skb)
85 {
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);
94 }
95 }
96
97 static inline void TCP_ECN_rcv_synack(struct tcp_sock *tp, struct tcphdr *th)
98 {
99 if ((tp->ecn_flags&TCP_ECN_OK) && (!th->ece || th->cwr))
100 tp->ecn_flags &= ~TCP_ECN_OK;
101 }
102
103 static inline void TCP_ECN_rcv_syn(struct tcp_sock *tp, struct tcphdr *th)
104 {
105 if ((tp->ecn_flags&TCP_ECN_OK) && (!th->ece || !th->cwr))
106 tp->ecn_flags &= ~TCP_ECN_OK;
107 }
108
109 static inline int TCP_ECN_rcv_ecn_echo(struct tcp_sock *tp, struct tcphdr *th)
110 {
111 if (th->ece && !th->syn && (tp->ecn_flags&TCP_ECN_OK))
112 return 1;
113 return 0;
114 }
115
116 static inline void TCP_ECN_openreq_child(struct tcp_sock *tp,
117 struct request_sock *req)
118 {
119 tp->ecn_flags = inet_rsk(req)->ecn_ok ? TCP_ECN_OK : 0;
120 }
121
122 static __inline__ void
123 TCP_ECN_create_request(struct request_sock *req, struct tcphdr *th)
124 {
125 if (sysctl_tcp_ecn && th->ece && th->cwr)
126 inet_rsk(req)->ecn_ok = 1;
127 }
128
129 #endif