2566a509ca
Changes IP_ECN_set_ce() and IP6_ECN_set_ce() to return 0 if the CE bits could not bet set because none of the ECT bits are set or 1 if the CE bits are already set or have been successfully set. Introduces INET_ECN_set_ce(skb) to enable CE bits for all supported protocols. Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
129 lines
2.8 KiB
C
129 lines
2.8 KiB
C
#ifndef _INET_ECN_H_
|
|
#define _INET_ECN_H_
|
|
|
|
#include <linux/ip.h>
|
|
#include <linux/skbuff.h>
|
|
#include <net/dsfield.h>
|
|
|
|
enum {
|
|
INET_ECN_NOT_ECT = 0,
|
|
INET_ECN_ECT_1 = 1,
|
|
INET_ECN_ECT_0 = 2,
|
|
INET_ECN_CE = 3,
|
|
INET_ECN_MASK = 3,
|
|
};
|
|
|
|
static inline int INET_ECN_is_ce(__u8 dsfield)
|
|
{
|
|
return (dsfield & INET_ECN_MASK) == INET_ECN_CE;
|
|
}
|
|
|
|
static inline int INET_ECN_is_not_ect(__u8 dsfield)
|
|
{
|
|
return (dsfield & INET_ECN_MASK) == INET_ECN_NOT_ECT;
|
|
}
|
|
|
|
static inline int INET_ECN_is_capable(__u8 dsfield)
|
|
{
|
|
return (dsfield & INET_ECN_ECT_0);
|
|
}
|
|
|
|
static inline __u8 INET_ECN_encapsulate(__u8 outer, __u8 inner)
|
|
{
|
|
outer &= ~INET_ECN_MASK;
|
|
outer |= !INET_ECN_is_ce(inner) ? (inner & INET_ECN_MASK) :
|
|
INET_ECN_ECT_0;
|
|
return outer;
|
|
}
|
|
|
|
#define INET_ECN_xmit(sk) do { inet_sk(sk)->tos |= INET_ECN_ECT_0; } while (0)
|
|
#define INET_ECN_dontxmit(sk) \
|
|
do { inet_sk(sk)->tos &= ~INET_ECN_MASK; } while (0)
|
|
|
|
#define IP6_ECN_flow_init(label) do { \
|
|
(label) &= ~htonl(INET_ECN_MASK << 20); \
|
|
} while (0)
|
|
|
|
#define IP6_ECN_flow_xmit(sk, label) do { \
|
|
if (INET_ECN_is_capable(inet_sk(sk)->tos)) \
|
|
(label) |= __constant_htons(INET_ECN_ECT_0 << 4); \
|
|
} while (0)
|
|
|
|
static inline int IP_ECN_set_ce(struct iphdr *iph)
|
|
{
|
|
u32 check = iph->check;
|
|
u32 ecn = (iph->tos + 1) & INET_ECN_MASK;
|
|
|
|
/*
|
|
* After the last operation we have (in binary):
|
|
* INET_ECN_NOT_ECT => 01
|
|
* INET_ECN_ECT_1 => 10
|
|
* INET_ECN_ECT_0 => 11
|
|
* INET_ECN_CE => 00
|
|
*/
|
|
if (!(ecn & 2))
|
|
return !ecn;
|
|
|
|
/*
|
|
* The following gives us:
|
|
* INET_ECN_ECT_1 => check += htons(0xFFFD)
|
|
* INET_ECN_ECT_0 => check += htons(0xFFFE)
|
|
*/
|
|
check += htons(0xFFFB) + htons(ecn);
|
|
|
|
iph->check = check + (check>=0xFFFF);
|
|
iph->tos |= INET_ECN_CE;
|
|
return 1;
|
|
}
|
|
|
|
static inline void IP_ECN_clear(struct iphdr *iph)
|
|
{
|
|
iph->tos &= ~INET_ECN_MASK;
|
|
}
|
|
|
|
static inline void ipv4_copy_dscp(struct iphdr *outer, struct iphdr *inner)
|
|
{
|
|
u32 dscp = ipv4_get_dsfield(outer) & ~INET_ECN_MASK;
|
|
ipv4_change_dsfield(inner, INET_ECN_MASK, dscp);
|
|
}
|
|
|
|
struct ipv6hdr;
|
|
|
|
static inline int IP6_ECN_set_ce(struct ipv6hdr *iph)
|
|
{
|
|
if (INET_ECN_is_not_ect(ipv6_get_dsfield(iph)))
|
|
return 0;
|
|
*(u32*)iph |= htonl(INET_ECN_CE << 20);
|
|
return 1;
|
|
}
|
|
|
|
static inline void IP6_ECN_clear(struct ipv6hdr *iph)
|
|
{
|
|
*(u32*)iph &= ~htonl(INET_ECN_MASK << 20);
|
|
}
|
|
|
|
static inline void ipv6_copy_dscp(struct ipv6hdr *outer, struct ipv6hdr *inner)
|
|
{
|
|
u32 dscp = ipv6_get_dsfield(outer) & ~INET_ECN_MASK;
|
|
ipv6_change_dsfield(inner, INET_ECN_MASK, dscp);
|
|
}
|
|
|
|
static inline int INET_ECN_set_ce(struct sk_buff *skb)
|
|
{
|
|
switch (skb->protocol) {
|
|
case __constant_htons(ETH_P_IP):
|
|
if (skb->nh.raw + sizeof(struct iphdr) <= skb->tail)
|
|
return IP_ECN_set_ce(skb->nh.iph);
|
|
break;
|
|
|
|
case __constant_htons(ETH_P_IPV6):
|
|
if (skb->nh.raw + sizeof(struct ipv6hdr) <= skb->tail)
|
|
return IP6_ECN_set_ce(skb->nh.ipv6h);
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif
|