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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/include/net/inet_ecn.h
10817 views
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#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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static inline void INET_ECN_xmit(struct sock *sk)

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{

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	inet_sk(sk)->tos |= INET_ECN_ECT_0;

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	if (inet6_sk(sk) != NULL)

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		inet6_sk(sk)->tclass |= INET_ECN_ECT_0;

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}

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static inline void INET_ECN_dontxmit(struct sock *sk)

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{

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	inet_sk(sk)->tos &= ~INET_ECN_MASK;

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	if (inet6_sk(sk) != NULL)

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		inet6_sk(sk)->tclass &= ~INET_ECN_MASK;

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}

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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(inet6_sk(sk)->tclass))			\

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		(label) |= htonl(INET_ECN_ECT_0 << 20);			\

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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 = (__force u32)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 += (__force u16)htons(0xFFFB) + (__force u16)htons(ecn);

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	iph->check = (__force __sum16)(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(unsigned int dscp, struct iphdr *inner)

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{

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	dscp &= ~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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	*(__be32*)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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	*(__be32*)iph &= ~htonl(INET_ECN_MASK << 20);

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}

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static inline void ipv6_copy_dscp(unsigned int dscp, struct ipv6hdr *inner)

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{

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	dscp &= ~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 cpu_to_be16(ETH_P_IP):

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		if (skb->network_header + sizeof(struct iphdr) <= skb->tail)

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			return IP_ECN_set_ce(ip_hdr(skb));

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		break;

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	case cpu_to_be16(ETH_P_IPV6):

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		if (skb->network_header + sizeof(struct ipv6hdr) <= skb->tail)

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			return IP6_ECN_set_ce(ipv6_hdr(skb));

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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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