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authorThomas Graf <tgraf@suug.ch>2005-11-05 21:14:04 +0100
committerThomas Graf <tgr@axs.localdomain>2005-11-05 22:02:24 +0100
commit2566a509cacc8b8eaea2e5b54068816c9cfb41c2 (patch)
tree1413b02bd2e8a7c3046f10ed92af49e165ea8369 /include/net/inet_ecn.h
parenta783474591f2eed0348e08b15934fa9a25e23b3e (diff)
downloadlinux-2566a509cacc8b8eaea2e5b54068816c9cfb41c2.tar.bz2
[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: Thomas Graf <tgraf@suug.ch> Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Diffstat (limited to 'include/net/inet_ecn.h')
-rw-r--r--include/net/inet_ecn.h28
1 files changed, 24 insertions, 4 deletions
diff --git a/include/net/inet_ecn.h b/include/net/inet_ecn.h
index f87845e2e965..b0c47e2eccf1 100644
--- a/include/net/inet_ecn.h
+++ b/include/net/inet_ecn.h
@@ -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