KRT: Add support for plenty of kernel route metrics

Linux kernel route metrics (RTA_METRICS netlink route attribute) are
represented and accessible as new route attributes:

krt_mtu, krt_window, krt_rtt, krt_rttvar, krt_sstresh, krt_cwnd, krt_advmss,
krt_reordering, krt_hoplimit, krt_initcwnd, krt_rto_min, krt_initrwnd,
krt_quickack, krt_lock_mtu, krt_lock_window, krt_lock_rtt, krt_lock_rttvar,
krt_lock_sstresh, krt_lock_cwnd, krt_lock_advmss, krt_lock_reordering,
krt_lock_hoplimit, krt_lock_rto_min, krt_feature_ecn, krt_feature_allfrag

1 files changed, 53 insertions, 0 deletions

diff --git a/sysdep/linux/krt-sys.h b/sysdep/linux/krt-sys.h
index 7e97968a..e32e4fe1 100644
--- a/sysdep/linux/krt-sys.h
+++ b/sysdep/linux/krt-sys.h
@@ -32,6 +32,59 @@ static inline struct ifa * kif_get_primary_ip(struct iface *i) { return NULL; }
 
 /* Kernel routes */
 
+#define EA_KRT_PREFSRC		EA_CODE(EAP_KRT, 0x10)
+#define EA_KRT_REALM		EA_CODE(EAP_KRT, 0x11)
+
+
+#define KRT_METRICS_MAX		0x10	/* RTAX_QUICKACK+1 */
+#define KRT_METRICS_OFFSET	0x20	/* Offset of EA_KRT_* vs RTAX_* */
+
+#define KRT_FEATURES_MAX	4
+
+/*
+ * Following attributes are parts of RTA_METRICS kernel route attribute, their
+ * ids must be consistent with their RTAX_* constants (+ KRT_METRICS_OFFSET)
+ */
+#define EA_KRT_METRICS		EA_CODE(EAP_KRT, 0x20)	/* Dummy one */
+#define EA_KRT_LOCK		EA_CODE(EAP_KRT, 0x21)
+#define EA_KRT_MTU		EA_CODE(EAP_KRT, 0x22)
+#define EA_KRT_WINDOW		EA_CODE(EAP_KRT, 0x23)
+#define EA_KRT_RTT		EA_CODE(EAP_KRT, 0x24)
+#define EA_KRT_RTTVAR		EA_CODE(EAP_KRT, 0x25)
+#define EA_KRT_SSTRESH		EA_CODE(EAP_KRT, 0x26)
+#define EA_KRT_CWND		EA_CODE(EAP_KRT, 0x27)
+#define EA_KRT_ADVMSS		EA_CODE(EAP_KRT, 0x28)
+#define EA_KRT_REORDERING 	EA_CODE(EAP_KRT, 0x29)
+#define EA_KRT_HOPLIMIT		EA_CODE(EAP_KRT, 0x2a)
+#define EA_KRT_INITCWND		EA_CODE(EAP_KRT, 0x2b)
+#define EA_KRT_FEATURES		EA_CODE(EAP_KRT, 0x2c)
+#define EA_KRT_RTO_MIN		EA_CODE(EAP_KRT, 0x2d)
+#define EA_KRT_INITRWND		EA_CODE(EAP_KRT, 0x2e)
+#define EA_KRT_QUICKACK		EA_CODE(EAP_KRT, 0x2f)
+
+/* Bits of EA_KRT_LOCK, also based on RTAX_* constants */
+#define EA_KRT_LOCK_MTU		EA_KRT_LOCK | EA_BIT(0x2)
+#define EA_KRT_LOCK_WINDOW	EA_KRT_LOCK | EA_BIT(0x3)
+#define EA_KRT_LOCK_RTT		EA_KRT_LOCK | EA_BIT(0x4)
+#define EA_KRT_LOCK_RTTVAR	EA_KRT_LOCK | EA_BIT(0x5)
+#define EA_KRT_LOCK_SSTHRESH	EA_KRT_LOCK | EA_BIT(0x6)
+#define EA_KRT_LOCK_CWND	EA_KRT_LOCK | EA_BIT(0x7)
+#define EA_KRT_LOCK_ADVMSS	EA_KRT_LOCK | EA_BIT(0x8)
+#define EA_KRT_LOCK_REORDERING 	EA_KRT_LOCK | EA_BIT(0x9)
+#define EA_KRT_LOCK_HOPLIMIT	EA_KRT_LOCK | EA_BIT(0xa)
+// define EA_KRT_LOCK_INITCWND	EA_KRT_LOCK | EA_BIT(0xb)
+// define EA_KRT_LOCK_FEATURES	EA_KRT_LOCK | EA_BIT(0xc)
+#define EA_KRT_LOCK_RTO_MIN	EA_KRT_LOCK | EA_BIT(0xd)
+// define EA_KRT_LOCK_INITRWND	EA_KRT_LOCK | EA_BIT(0xe)
+
+/* Bits of EA_KRT_FEATURES, based on RTAX_FEATURE_* constants */
+#define EA_KRT_FEATURE_ECN	EA_KRT_FEATURES | EA_BIT(0x0)
+// define EA_KRT_FEATURE_SACK	EA_KRT_FEATURES | EA_BIT(0x1)
+// define EA_KRT_FEATURE_TSTAMP	EA_KRT_FEATURES | EA_BIT(0x2)
+#define EA_KRT_FEATURE_ALLFRAG	EA_KRT_FEATURES | EA_BIT(0x3)
+
+
+
 #define NL_NUM_TABLES 256
 
 struct krt_params {