14c850212e
To help in reducing the number of include dependencies, several files were touched as they were getting needed headers indirectly for stuff they use. Thanks also to Alan Menegotto for pointing out that net/dccp/proto.c had linux/dccp.h include twice. Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com> Signed-off-by: David S. Miller <davem@davemloft.net>
131 lines
2.8 KiB
C
131 lines
2.8 KiB
C
#ifndef _INET_ECN_H_
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#define _INET_ECN_H_
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#include <linux/ip.h>
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#include <linux/skbuff.h>
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#include <net/inet_sock.h>
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#include <net/dsfield.h>
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enum {
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INET_ECN_NOT_ECT = 0,
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INET_ECN_ECT_1 = 1,
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INET_ECN_ECT_0 = 2,
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INET_ECN_CE = 3,
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INET_ECN_MASK = 3,
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};
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static inline int INET_ECN_is_ce(__u8 dsfield)
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{
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return (dsfield & INET_ECN_MASK) == INET_ECN_CE;
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}
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static inline int INET_ECN_is_not_ect(__u8 dsfield)
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{
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return (dsfield & INET_ECN_MASK) == INET_ECN_NOT_ECT;
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}
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static inline int INET_ECN_is_capable(__u8 dsfield)
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{
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return (dsfield & INET_ECN_ECT_0);
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}
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static inline __u8 INET_ECN_encapsulate(__u8 outer, __u8 inner)
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{
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outer &= ~INET_ECN_MASK;
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outer |= !INET_ECN_is_ce(inner) ? (inner & INET_ECN_MASK) :
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INET_ECN_ECT_0;
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return outer;
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}
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#define INET_ECN_xmit(sk) do { inet_sk(sk)->tos |= INET_ECN_ECT_0; } while (0)
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#define INET_ECN_dontxmit(sk) \
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do { inet_sk(sk)->tos &= ~INET_ECN_MASK; } while (0)
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#define IP6_ECN_flow_init(label) do { \
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(label) &= ~htonl(INET_ECN_MASK << 20); \
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} while (0)
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#define IP6_ECN_flow_xmit(sk, label) do { \
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if (INET_ECN_is_capable(inet_sk(sk)->tos)) \
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(label) |= __constant_htons(INET_ECN_ECT_0 << 4); \
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} while (0)
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static inline int IP_ECN_set_ce(struct iphdr *iph)
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{
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u32 check = iph->check;
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u32 ecn = (iph->tos + 1) & INET_ECN_MASK;
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/*
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* After the last operation we have (in binary):
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* INET_ECN_NOT_ECT => 01
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* INET_ECN_ECT_1 => 10
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* INET_ECN_ECT_0 => 11
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* INET_ECN_CE => 00
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*/
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if (!(ecn & 2))
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return !ecn;
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/*
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* The following gives us:
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* INET_ECN_ECT_1 => check += htons(0xFFFD)
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* INET_ECN_ECT_0 => check += htons(0xFFFE)
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*/
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check += htons(0xFFFB) + htons(ecn);
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iph->check = check + (check>=0xFFFF);
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iph->tos |= INET_ECN_CE;
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return 1;
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}
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static inline void IP_ECN_clear(struct iphdr *iph)
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{
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iph->tos &= ~INET_ECN_MASK;
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}
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static inline void ipv4_copy_dscp(struct iphdr *outer, struct iphdr *inner)
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{
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u32 dscp = ipv4_get_dsfield(outer) & ~INET_ECN_MASK;
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ipv4_change_dsfield(inner, INET_ECN_MASK, dscp);
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}
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struct ipv6hdr;
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static inline int IP6_ECN_set_ce(struct ipv6hdr *iph)
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{
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if (INET_ECN_is_not_ect(ipv6_get_dsfield(iph)))
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return 0;
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*(u32*)iph |= htonl(INET_ECN_CE << 20);
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return 1;
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}
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static inline void IP6_ECN_clear(struct ipv6hdr *iph)
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{
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*(u32*)iph &= ~htonl(INET_ECN_MASK << 20);
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}
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static inline void ipv6_copy_dscp(struct ipv6hdr *outer, struct ipv6hdr *inner)
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{
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u32 dscp = ipv6_get_dsfield(outer) & ~INET_ECN_MASK;
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ipv6_change_dsfield(inner, INET_ECN_MASK, dscp);
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}
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static inline int INET_ECN_set_ce(struct sk_buff *skb)
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{
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switch (skb->protocol) {
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case __constant_htons(ETH_P_IP):
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if (skb->nh.raw + sizeof(struct iphdr) <= skb->tail)
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return IP_ECN_set_ce(skb->nh.iph);
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break;
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case __constant_htons(ETH_P_IPV6):
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if (skb->nh.raw + sizeof(struct ipv6hdr) <= skb->tail)
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return IP6_ECN_set_ce(skb->nh.ipv6h);
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break;
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}
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return 0;
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}
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#endif
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