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Commit 2566a509 authored by Thomas Graf's avatar Thomas Graf Committed by Thomas Graf
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[NET]: Introduce INET_ECN_set_ce() function 



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: default avatarThomas Graf <tgraf@suug.ch>
Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@mandriva.com>
parent a7834745

include/net/inet_ecn.h

+24 −4
Original line number Diff line number Diff line
@@ -2,6 +2,7 @@ 
#define _INET_ECN_H_



#include <linux/ip.h>

#include <linux/skbuff.h>

#include <net/dsfield.h>



enum {
@@ -48,7 +49,7 @@ static inline __u8 INET_ECN_encapsulate(__u8 outer, __u8 inner) 
		(label) |= __constant_htons(INET_ECN_ECT_0 << 4);	\

    } while (0)



static inline void IP_ECN_set_ce(struct iphdr *iph)

static inline int IP_ECN_set_ce(struct iphdr *iph)

{

	u32 check = iph->check;

	u32 ecn = (iph->tos + 1) & INET_ECN_MASK;
@@ -61,7 +62,7 @@ static inline void IP_ECN_set_ce(struct iphdr *iph) 
	 * INET_ECN_CE      => 00

	 */

	if (!(ecn & 2))

		return;

		return !ecn;



	/*

	 * The following gives us:
@@ -72,6 +73,7 @@ static inline void IP_ECN_set_ce(struct iphdr *iph) 


	iph->check = check + (check>=0xFFFF);

	iph->tos |= INET_ECN_CE;

	return 1;

}



static inline void IP_ECN_clear(struct iphdr *iph)
@@ -87,11 +89,12 @@ static inline void ipv4_copy_dscp(struct iphdr *outer, struct iphdr *inner) 


struct ipv6hdr;



static inline void IP6_ECN_set_ce(struct ipv6hdr *iph)

static inline int IP6_ECN_set_ce(struct ipv6hdr *iph)

{

	if (INET_ECN_is_not_ect(ipv6_get_dsfield(iph)))

		return;

		return 0;

	*(u32*)iph |= htonl(INET_ECN_CE << 20);

	return 1;

}



static inline void IP6_ECN_clear(struct ipv6hdr *iph)
@@ -105,4 +108,21 @@ static inline void ipv6_copy_dscp(struct ipv6hdr *outer, struct ipv6hdr *inner) 
	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