--- /dev/null
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+/* This file contains constants defined in <linux/errqueue.h> and
+ * <linux/net_tstamp.h> so as to allow collecting network timestamps in the
+ * kernel. This file allows tcp_posix.cc to compile on platforms that do not
+ * have <linux/errqueue.h> and <linux/net_tstamp.h>.
+ */
+
+#ifndef GRPC_CORE_LIB_IOMGR_INTERNAL_ERRQUEUE_H
+#define GRPC_CORE_LIB_IOMGR_INTERNAL_ERRQUEUE_H
+
+#include <grpc/support/port_platform.h>
+
+#include "src/core/lib/iomgr/port.h"
+
+#ifdef GRPC_POSIX_SOCKET_TCP
+
+#include <sys/types.h>
+#include <time.h>
+
+#ifdef GRPC_LINUX_ERRQUEUE
+#include <linux/errqueue.h>
+#include <linux/net_tstamp.h>
+#include <linux/netlink.h>
+#include <sys/socket.h>
+#endif /* GRPC_LINUX_ERRQUEUE */
+
+namespace grpc_core {
+
+#ifdef GRPC_LINUX_ERRQUEUE
+
+/* Redefining scm_timestamping in the same way that <linux/errqueue.h> defines
+ * it, so that code compiles on systems that don't have it. */
+struct scm_timestamping {
+ struct timespec ts[3];
+};
+/* Also redefine timestamp types */
+/* The timestamp type for when the driver passed skb to NIC, or HW. */
+constexpr int SCM_TSTAMP_SND = 0;
+/* The timestamp type for when data entered the packet scheduler. */
+constexpr int SCM_TSTAMP_SCHED = 1;
+/* The timestamp type for when data acknowledged by peer. */
+constexpr int SCM_TSTAMP_ACK = 2;
+
+/* Control message type containing OPT_STATS */
+#ifndef SCM_TIMESTAMPING_OPT_STATS
+#define SCM_TIMESTAMPING_OPT_STATS 54
+#endif
+
+/* Redefine required constants from <linux/net_tstamp.h> */
+constexpr uint32_t SOF_TIMESTAMPING_TX_SOFTWARE = 1u << 1;
+constexpr uint32_t SOF_TIMESTAMPING_SOFTWARE = 1u << 4;
+constexpr uint32_t SOF_TIMESTAMPING_OPT_ID = 1u << 7;
+constexpr uint32_t SOF_TIMESTAMPING_TX_SCHED = 1u << 8;
+constexpr uint32_t SOF_TIMESTAMPING_TX_ACK = 1u << 9;
+constexpr uint32_t SOF_TIMESTAMPING_OPT_TSONLY = 1u << 11;
+constexpr uint32_t SOF_TIMESTAMPING_OPT_STATS = 1u << 12;
+
+constexpr uint32_t kTimestampingSocketOptions =
+ SOF_TIMESTAMPING_SOFTWARE | SOF_TIMESTAMPING_OPT_ID |
+ SOF_TIMESTAMPING_OPT_TSONLY | SOF_TIMESTAMPING_OPT_STATS;
+constexpr uint32_t kTimestampingRecordingOptions =
+ SOF_TIMESTAMPING_TX_SCHED | SOF_TIMESTAMPING_TX_SOFTWARE |
+ SOF_TIMESTAMPING_TX_ACK;
+
+/* Netlink attribute types used for TCP opt stats. */
+enum TCPOptStats {
+ TCP_NLA_PAD,
+ TCP_NLA_BUSY, /* Time (usec) busy sending data. */
+ TCP_NLA_RWND_LIMITED, /* Time (usec) limited by receive window. */
+ TCP_NLA_SNDBUF_LIMITED, /* Time (usec) limited by send buffer. */
+ TCP_NLA_DATA_SEGS_OUT, /* Data pkts sent including retransmission. */
+ TCP_NLA_TOTAL_RETRANS, /* Data pkts retransmitted. */
+ TCP_NLA_PACING_RATE, /* Pacing rate in Bps. */
+ TCP_NLA_DELIVERY_RATE, /* Delivery rate in Bps. */
+ TCP_NLA_SND_CWND, /* Sending congestion window. */
+ TCP_NLA_REORDERING, /* Reordering metric. */
+ TCP_NLA_MIN_RTT, /* minimum RTT. */
+ TCP_NLA_RECUR_RETRANS, /* Recurring retransmits for the current pkt. */
+ TCP_NLA_DELIVERY_RATE_APP_LMT, /* Delivery rate application limited? */
+ TCP_NLA_SNDQ_SIZE, /* Data (bytes) pending in send queue */
+ TCP_NLA_CA_STATE, /* ca_state of socket */
+ TCP_NLA_SND_SSTHRESH, /* Slow start size threshold */
+ TCP_NLA_DELIVERED, /* Data pkts delivered incl. out-of-order */
+ TCP_NLA_DELIVERED_CE, /* Like above but only ones w/ CE marks */
+ TCP_NLA_BYTES_SENT, /* Data bytes sent including retransmission */
+ TCP_NLA_BYTES_RETRANS, /* Data bytes retransmitted */
+ TCP_NLA_DSACK_DUPS, /* DSACK blocks received */
+ TCP_NLA_REORD_SEEN, /* reordering events seen */
+ TCP_NLA_SRTT, /* smoothed RTT in usecs */
+};
+
+/* tcp_info from from linux/tcp.h */
+struct tcp_info {
+ uint8_t tcpi_state;
+ uint8_t tcpi_ca_state;
+ uint8_t tcpi_retransmits;
+ uint8_t tcpi_probes;
+ uint8_t tcpi_backoff;
+ uint8_t tcpi_options;
+ uint8_t tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4;
+ uint8_t tcpi_delivery_rate_app_limited : 1;
+ uint32_t tcpi_rto;
+ uint32_t tcpi_ato;
+ uint32_t tcpi_snd_mss;
+ uint32_t tcpi_rcv_mss;
+ uint32_t tcpi_unacked;
+ uint32_t tcpi_sacked;
+ uint32_t tcpi_lost;
+ uint32_t tcpi_retrans;
+ uint32_t tcpi_fackets;
+ /* Times. */
+ uint32_t tcpi_last_data_sent;
+ uint32_t tcpi_last_ack_sent; /* Not remembered, sorry. */
+ uint32_t tcpi_last_data_recv;
+ uint32_t tcpi_last_ack_recv;
+ /* Metrics. */
+ uint32_t tcpi_pmtu;
+ uint32_t tcpi_rcv_ssthresh;
+ uint32_t tcpi_rtt;
+ uint32_t tcpi_rttvar;
+ uint32_t tcpi_snd_ssthresh;
+ uint32_t tcpi_snd_cwnd;
+ uint32_t tcpi_advmss;
+ uint32_t tcpi_reordering;
+ uint32_t tcpi_rcv_rtt;
+ uint32_t tcpi_rcv_space;
+ uint32_t tcpi_total_retrans;
+ uint64_t tcpi_pacing_rate;
+ uint64_t tcpi_max_pacing_rate;
+ uint64_t tcpi_bytes_acked; /* RFC4898 tcpEStatsAppHCThruOctetsAcked */
+ uint64_t tcpi_bytes_received; /* RFC4898 tcpEStatsAppHCThruOctetsReceived */
+
+ uint32_t tcpi_segs_out; /* RFC4898 tcpEStatsPerfSegsOut */
+ uint32_t tcpi_segs_in; /* RFC4898 tcpEStatsPerfSegsIn */
+ uint32_t tcpi_notsent_bytes;
+ uint32_t tcpi_min_rtt;
+
+ uint32_t tcpi_data_segs_in; /* RFC4898 tcpEStatsDataSegsIn */
+ uint32_t tcpi_data_segs_out; /* RFC4898 tcpEStatsDataSegsOut */
+
+ uint64_t tcpi_delivery_rate;
+ uint64_t tcpi_busy_time; /* Time (usec) busy sending data */
+ uint64_t tcpi_rwnd_limited; /* Time (usec) limited by receive window */
+ uint64_t tcpi_sndbuf_limited; /* Time (usec) limited by send buffer */
+
+ uint32_t tcpi_delivered;
+ uint32_t tcpi_delivered_ce;
+ uint64_t tcpi_bytes_sent; /* RFC4898 tcpEStatsPerfHCDataOctetsOut */
+ uint64_t tcpi_bytes_retrans; /* RFC4898 tcpEStatsPerfOctetsRetrans */
+ uint32_t tcpi_dsack_dups; /* RFC4898 tcpEStatsStackDSACKDups */
+ uint32_t tcpi_reord_seen; /* reordering events seen */
+ socklen_t length; /* Length of struct returned by kernel */
+};
+
+#ifndef TCP_INFO
+#define TCP_INFO 11
+#endif
+#endif /* GRPC_LINUX_ERRQUEUE */
+
+/* Returns true if kernel is capable of supporting errqueue and timestamping.
+ * Currently allowing only linux kernels above 4.0.0
+ */
+bool kernel_supports_errqueue();
+
+} /* namespace grpc_core */
+
+#endif /* GRPC_POSIX_SOCKET_TCP */
+
+namespace grpc_core {
+/* Initializes errqueue support */
+void grpc_errqueue_init();
+} /* namespace grpc_core */
+
+#endif /* GRPC_CORE_LIB_IOMGR_INTERNAL_ERRQUEUE_H */
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