X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=include%2Fnet%2Finet_ecn.h;h=10117c8503e87b649790b9d119467eb3e8d05c8f;hb=refs%2Fheads%2Fvserver;hp=4b9c7556273ae877578b6821c0e2868667a167f5;hpb=9bf4aaab3e101692164d49b7ca357651eb691cb6;p=linux-2.6.git

diff --git a/include/net/inet_ecn.h b/include/net/inet_ecn.h
index 4b9c75562..10117c850 100644
--- a/include/net/inet_ecn.h
+++ b/include/net/inet_ecn.h
@@ -2,6 +2,10 @@
 #define _INET_ECN_H_
 
 #include <linux/ip.h>
+#include <linux/skbuff.h>
+
+#include <net/inet_sock.h>
+#include <net/dsfield.h>
 
 enum {
 	INET_ECN_NOT_ECT = 0,
@@ -16,9 +20,9 @@ static inline int INET_ECN_is_ce(__u8 dsfield)
 	return (dsfield & INET_ECN_MASK) == INET_ECN_CE;
 }
 
-static inline int INET_ECN_is_not_ce(__u8 dsfield)
+static inline int INET_ECN_is_not_ect(__u8 dsfield)
 {
-	return (dsfield & INET_ECN_MASK) == INET_ECN_ECT_0;
+	return (dsfield & INET_ECN_MASK) == INET_ECN_NOT_ECT;
 }
 
 static inline int INET_ECN_is_capable(__u8 dsfield)
@@ -29,8 +33,8 @@ static inline int INET_ECN_is_capable(__u8 dsfield)
 static inline __u8 INET_ECN_encapsulate(__u8 outer, __u8 inner)
 {
 	outer &= ~INET_ECN_MASK;
-	if (INET_ECN_is_capable(inner))
-		outer |= (inner & INET_ECN_MASK);
+	outer |= !INET_ECN_is_ce(inner) ? (inner & INET_ECN_MASK) :
+					  INET_ECN_ECT_0;
 	return outer;
 }
 
@@ -44,15 +48,34 @@ static inline __u8 INET_ECN_encapsulate(__u8 outer, __u8 inner)
 
 #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);	\
+		(label) |= htonl(INET_ECN_ECT_0 << 20);			\
     } 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;
-	check += __constant_htons(0xFFFE);
-	iph->check = check + (check>=0xFFFF);
+	u32 check = (__force u32)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 += (__force u16)htons(0xFFFB) + (__force u16)htons(ecn);
+
+	iph->check = (__force __sum16)(check + (check>=0xFFFF));
 	iph->tos |= INET_ECN_CE;
+	return 1;
 }
 
 static inline void IP_ECN_clear(struct iphdr *iph)
@@ -60,18 +83,48 @@ 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 void IP6_ECN_set_ce(struct ipv6hdr *iph)
+static inline int IP6_ECN_set_ce(struct ipv6hdr *iph)
 {
-	*(u32*)iph |= htonl(INET_ECN_CE << 20);
+	if (INET_ECN_is_not_ect(ipv6_get_dsfield(iph)))
+		return 0;
+	*(__be32*)iph |= htonl(INET_ECN_CE << 20);
+	return 1;
 }
 
 static inline void IP6_ECN_clear(struct ipv6hdr *iph)
 {
-	*(u32*)iph &= ~htonl(INET_ECN_MASK << 20);
+	*(__be32*)iph &= ~htonl(INET_ECN_MASK << 20);
 }
 
-#define ip6_get_dsfield(iph) ((ntohs(*(u16*)(iph)) >> 4) & 0xFF)
+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