diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 02:20:36 +0400 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 02:20:36 +0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/net/tcp_ecn.h | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'include/net/tcp_ecn.h')
-rw-r--r-- | include/net/tcp_ecn.h | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/include/net/tcp_ecn.h b/include/net/tcp_ecn.h new file mode 100644 index 000000000000..dc1456389a97 --- /dev/null +++ b/include/net/tcp_ecn.h @@ -0,0 +1,126 @@ +#ifndef _NET_TCP_ECN_H_ +#define _NET_TCP_ECN_H_ 1 + +#include <net/inet_ecn.h> + +#define TCP_HP_BITS (~(TCP_RESERVED_BITS|TCP_FLAG_PSH)) + +#define TCP_ECN_OK 1 +#define TCP_ECN_QUEUE_CWR 2 +#define TCP_ECN_DEMAND_CWR 4 + +static inline void TCP_ECN_queue_cwr(struct tcp_sock *tp) +{ + if (tp->ecn_flags&TCP_ECN_OK) + tp->ecn_flags |= TCP_ECN_QUEUE_CWR; +} + + +/* Output functions */ + +static inline void TCP_ECN_send_synack(struct tcp_sock *tp, + struct sk_buff *skb) +{ + TCP_SKB_CB(skb)->flags &= ~TCPCB_FLAG_CWR; + if (!(tp->ecn_flags&TCP_ECN_OK)) + TCP_SKB_CB(skb)->flags &= ~TCPCB_FLAG_ECE; +} + +static inline void TCP_ECN_send_syn(struct sock *sk, struct tcp_sock *tp, + struct sk_buff *skb) +{ + tp->ecn_flags = 0; + if (sysctl_tcp_ecn && !(sk->sk_route_caps & NETIF_F_TSO)) { + TCP_SKB_CB(skb)->flags |= TCPCB_FLAG_ECE|TCPCB_FLAG_CWR; + tp->ecn_flags = TCP_ECN_OK; + sock_set_flag(sk, SOCK_NO_LARGESEND); + } +} + +static __inline__ void +TCP_ECN_make_synack(struct open_request *req, struct tcphdr *th) +{ + if (req->ecn_ok) + th->ece = 1; +} + +static inline void TCP_ECN_send(struct sock *sk, struct tcp_sock *tp, + struct sk_buff *skb, int tcp_header_len) +{ + if (tp->ecn_flags & TCP_ECN_OK) { + /* Not-retransmitted data segment: set ECT and inject CWR. */ + if (skb->len != tcp_header_len && + !before(TCP_SKB_CB(skb)->seq, tp->snd_nxt)) { + INET_ECN_xmit(sk); + if (tp->ecn_flags&TCP_ECN_QUEUE_CWR) { + tp->ecn_flags &= ~TCP_ECN_QUEUE_CWR; + skb->h.th->cwr = 1; + } + } else { + /* ACK or retransmitted segment: clear ECT|CE */ + INET_ECN_dontxmit(sk); + } + if (tp->ecn_flags & TCP_ECN_DEMAND_CWR) + skb->h.th->ece = 1; + } +} + +/* Input functions */ + +static inline void TCP_ECN_accept_cwr(struct tcp_sock *tp, struct sk_buff *skb) +{ + if (skb->h.th->cwr) + tp->ecn_flags &= ~TCP_ECN_DEMAND_CWR; +} + +static inline void TCP_ECN_withdraw_cwr(struct tcp_sock *tp) +{ + tp->ecn_flags &= ~TCP_ECN_DEMAND_CWR; +} + +static inline void TCP_ECN_check_ce(struct tcp_sock *tp, struct sk_buff *skb) +{ + if (tp->ecn_flags&TCP_ECN_OK) { + if (INET_ECN_is_ce(TCP_SKB_CB(skb)->flags)) + tp->ecn_flags |= TCP_ECN_DEMAND_CWR; + /* Funny extension: if ECT is not set on a segment, + * it is surely retransmit. It is not in ECN RFC, + * but Linux follows this rule. */ + else if (INET_ECN_is_not_ect((TCP_SKB_CB(skb)->flags))) + tcp_enter_quickack_mode(tp); + } +} + +static inline void TCP_ECN_rcv_synack(struct tcp_sock *tp, struct tcphdr *th) +{ + if ((tp->ecn_flags&TCP_ECN_OK) && (!th->ece || th->cwr)) + tp->ecn_flags &= ~TCP_ECN_OK; +} + +static inline void TCP_ECN_rcv_syn(struct tcp_sock *tp, struct tcphdr *th) +{ + if ((tp->ecn_flags&TCP_ECN_OK) && (!th->ece || !th->cwr)) + tp->ecn_flags &= ~TCP_ECN_OK; +} + +static inline int TCP_ECN_rcv_ecn_echo(struct tcp_sock *tp, struct tcphdr *th) +{ + if (th->ece && !th->syn && (tp->ecn_flags&TCP_ECN_OK)) + return 1; + return 0; +} + +static inline void TCP_ECN_openreq_child(struct tcp_sock *tp, + struct open_request *req) +{ + tp->ecn_flags = req->ecn_ok ? TCP_ECN_OK : 0; +} + +static __inline__ void +TCP_ECN_create_request(struct open_request *req, struct tcphdr *th) +{ + if (sysctl_tcp_ecn && th->ece && th->cwr) + req->ecn_ok = 1; +} + +#endif |