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-rw-r--r--include/net/inet_ecn.h108
1 files changed, 108 insertions, 0 deletions
diff --git a/include/net/inet_ecn.h b/include/net/inet_ecn.h
new file mode 100644
index 000000000000..f87845e2e965
--- /dev/null
+++ b/include/net/inet_ecn.h
@@ -0,0 +1,108 @@
+#ifndef _INET_ECN_H_
+#define _INET_ECN_H_
+
+#include <linux/ip.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 void 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;
+
+ /*
+ * 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;
+}
+
+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)
+{
+ if (INET_ECN_is_not_ect(ipv6_get_dsfield(iph)))
+ return;
+ *(u32*)iph |= htonl(INET_ECN_CE << 20);
+}
+
+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);
+}
+
+#endif