/* * Copyright (c) 2000-2016 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* * Copyright (c) 1982, 1986, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)tcp.h 8.1 (Berkeley) 6/10/93 * $FreeBSD: src/sys/netinet/tcp.h,v 1.13.2.3 2001/03/01 22:08:42 jlemon Exp $ */ #ifndef _NETINET_TCP_H_ #define _NETINET_TCP_H_ #include <sys/types.h> #include <sys/appleapiopts.h> #include <machine/endian.h> #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE) typedef __uint32_t tcp_seq; typedef __uint32_t tcp_cc; /* connection count per rfc1644 */ #define tcp6_seq tcp_seq /* for KAME src sync over BSD*'s */ #define tcp6hdr tcphdr /* for KAME src sync over BSD*'s */ /* * TCP header. * Per RFC 793, September, 1981. */ struct tcphdr { unsigned short th_sport; /* source port */ unsigned short th_dport; /* destination port */ tcp_seq th_seq; /* sequence number */ tcp_seq th_ack; /* acknowledgement number */ #if __DARWIN_BYTE_ORDER == __DARWIN_LITTLE_ENDIAN unsigned int th_x2:4, /* (unused) */ th_off:4; /* data offset */ #endif #if __DARWIN_BYTE_ORDER == __DARWIN_BIG_ENDIAN unsigned int th_off:4, /* data offset */ th_x2:4; /* (unused) */ #endif unsigned char th_flags; #define TH_FIN 0x01 #define TH_SYN 0x02 #define TH_RST 0x04 #define TH_PUSH 0x08 #define TH_ACK 0x10 #define TH_URG 0x20 #define TH_ECE 0x40 #define TH_CWR 0x80 #define TH_FLAGS (TH_FIN|TH_SYN|TH_RST|TH_ACK|TH_URG|TH_ECE|TH_CWR) unsigned short th_win; /* window */ unsigned short th_sum; /* checksum */ unsigned short th_urp; /* urgent pointer */ }; #define TCPOPT_EOL 0 #define TCPOPT_NOP 1 #define TCPOPT_MAXSEG 2 #define TCPOLEN_MAXSEG 4 #define TCPOPT_WINDOW 3 #define TCPOLEN_WINDOW 3 #define TCPOPT_SACK_PERMITTED 4 /* Experimental */ #define TCPOLEN_SACK_PERMITTED 2 #define TCPOPT_SACK 5 /* Experimental */ #define TCPOLEN_SACK 8 /* len of sack block */ #define TCPOPT_TIMESTAMP 8 #define TCPOLEN_TIMESTAMP 10 #define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */ #define TCPOPT_TSTAMP_HDR \ (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP) #define MAX_TCPOPTLEN 40 /* Absolute maximum TCP options len */ #define TCPOPT_CC 11 /* CC options: RFC-1644 */ #define TCPOPT_CCNEW 12 #define TCPOPT_CCECHO 13 #define TCPOLEN_CC 6 #define TCPOLEN_CC_APPA (TCPOLEN_CC+2) #define TCPOPT_CC_HDR(ccopt) \ (TCPOPT_NOP<<24|TCPOPT_NOP<<16|(ccopt)<<8|TCPOLEN_CC) #define TCPOPT_SIGNATURE 19 /* Keyed MD5: RFC 2385 */ #define TCPOLEN_SIGNATURE 18 #if MPTCP #define TCPOPT_MULTIPATH 30 #endif #define TCPOPT_FASTOPEN 34 #define TCPOLEN_FASTOPEN_REQ 2 /* Option definitions */ #define TCPOPT_SACK_PERMIT_HDR \ (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_SACK_PERMITTED<<8|TCPOLEN_SACK_PERMITTED) #define TCPOPT_SACK_HDR (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_SACK<<8) /* Miscellaneous constants */ #define MAX_SACK_BLKS 6 /* Max # SACK blocks stored at sender side */ /* * A SACK option that specifies n blocks will have a length of (8*n + 2) * bytes, so the 40 bytes available for TCP options can specify a * maximum of 4 blocks. */ #define TCP_MAX_SACK 4 /* MAX # SACKs sent in any segment */ /* * Default maximum segment size for TCP. * With an IP MTU of 576, this is 536, * but 512 is probably more convenient. * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)). */ #define TCP_MSS 512 /* * TCP_MINMSS is defined to be 216 which is fine for the smallest * link MTU (256 bytes, SLIP interface) in the Internet. * However it is very unlikely to come across such low MTU interfaces * these days (anno dato 2004). * Probably it can be set to 512 without ill effects. But we play safe. * See tcp_subr.c tcp_minmss SYSCTL declaration for more comments. * Setting this to "0" disables the minmss check. */ #define TCP_MINMSS 216 /* * Default maximum segment size for TCP6. * With an IP6 MSS of 1280, this is 1220, * but 1024 is probably more convenient. (xxx kazu in doubt) * This should be defined as MIN(1024, IP6_MSS - sizeof (struct tcpip6hdr)) */ #define TCP6_MSS 1024 #define TCP_MAXWIN 65535 /* largest value for (unscaled) window */ #define TTCP_CLIENT_SND_WND 4096 /* dflt send window for T/TCP client */ #define TCP_MAX_WINSHIFT 14 /* maximum window shift */ #define TCP_MAXHLEN (0xf<<2) /* max length of header in bytes */ #define TCP_MAXOLEN (TCP_MAXHLEN - sizeof(struct tcphdr)) /* max space left for options */ #endif /* (_POSIX_C_SOURCE && !_DARWIN_C_SOURCE) */ /* * User-settable options (used with setsockopt). */ #define TCP_NODELAY 0x01 /* don't delay send to coalesce packets */ #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE) #define TCP_MAXSEG 0x02 /* set maximum segment size */ #define TCP_NOPUSH 0x04 /* don't push last block of write */ #define TCP_NOOPT 0x08 /* don't use TCP options */ #define TCP_KEEPALIVE 0x10 /* idle time used when SO_KEEPALIVE is enabled */ #define TCP_CONNECTIONTIMEOUT 0x20 /* connection timeout */ #define PERSIST_TIMEOUT 0x40 /* time after which a connection in * persist timeout will terminate. * see draft-ananth-tcpm-persist-02.txt */ #define TCP_RXT_CONNDROPTIME 0x80 /* time after which tcp retransmissions will be * stopped and the connection will be dropped */ #define TCP_RXT_FINDROP 0x100 /* when this option is set, drop a connection * after retransmitting the FIN 3 times. It will * prevent holding too many mbufs in socket * buffer queues. */ #define TCP_KEEPINTVL 0x101 /* interval between keepalives */ #define TCP_KEEPCNT 0x102 /* number of keepalives before close */ #define TCP_SENDMOREACKS 0x103 /* always ack every other packet */ #define TCP_ENABLE_ECN 0x104 /* Enable ECN on a connection */ #define TCP_FASTOPEN 0x105 /* Enable/Disable TCP Fastopen on this socket */ #define TCP_CONNECTION_INFO 0x106 /* State of TCP connection */ #ifdef PRIVATE #define TCP_INFO 0x200 /* retrieve tcp_info structure */ #define TCP_MEASURE_SND_BW 0x202 /* Measure sender's bandwidth for this connection */ #endif /* PRIVATE */ #define TCP_NOTSENT_LOWAT 0x201 /* Low water mark for TCP unsent data */ #ifdef PRIVATE #define TCP_MEASURE_BW_BURST 0x203 /* Burst size to use for bandwidth measurement */ #define TCP_PEER_PID 0x204 /* Lookup pid of the process we're connected to */ #define TCP_ADAPTIVE_READ_TIMEOUT 0x205 /* Read timeout used as a multiple of RTT */ /* * Enable message delivery on a socket, this feature is currently unsupported and * is subjected to change in future. */ #define TCP_ENABLE_MSGS 0x206 #define TCP_ADAPTIVE_WRITE_TIMEOUT 0x207 /* Write timeout used as a multiple of RTT */ #define TCP_NOTIMEWAIT 0x208 /* Avoid going into time-wait */ #define TCP_DISABLE_BLACKHOLE_DETECTION 0x209 /* disable PMTU blackhole detection */ #define TCP_ECN_MODE 0x210 /* fine grain control for A/B testing */ #define TCP_KEEPALIVE_OFFLOAD 0x211 /* offload keep alive processing to firmware */ /* * TCP_ECN_MODE values */ #define ECN_MODE_DEFAULT 0x0 /* per interface or system wide default */ #define ECN_MODE_ENABLE 0x1 /* force enable ECN on connection */ #define ECN_MODE_DISABLE 0x2 /* force disable ECN on connection */ /* * TCP_NOTIFY_ACKNOWLEDGEMENT * * Application can use this socket option to get a notification when * data that is currently written to the socket is acknowledged. The input * argument given to this socket option is a marker_id that will be used for * returning the notification. The application can continue to write * data after setting the marker. There can be multiple of these events * outstanding on a socket at any time up to a max of TCP_MAX_NOTIFY_ACK. * * To get the completed notifications, getsockopt should be called with the * TCP_NOTIFY_ACKNOWLEDGEMENT with the following tcp_notify_ack_complete * structure as an out argument. At most TCP_MAX_NOTIFY_ACK ids will be * returned if they have been successfully acknowledged in each call. */ #define TCP_MAX_NOTIFY_ACK 10 typedef u_int32_t tcp_notify_ack_id_t; struct tcp_notify_ack_complete { u_int32_t notify_pending; /* still pending */ u_int32_t notify_complete_count; tcp_notify_ack_id_t notify_complete_id[TCP_MAX_NOTIFY_ACK]; }; #define TCP_NOTIFY_ACKNOWLEDGEMENT 0x212 /* Notify when data is acknowledged */ /* * The TCP_INFO socket option is a private API and is subject to change */ #pragma pack(4) #define TCPI_OPT_TIMESTAMPS 0x01 #define TCPI_OPT_SACK 0x02 #define TCPI_OPT_WSCALE 0x04 #define TCPI_OPT_ECN 0x08 #define TCPI_FLAG_LOSSRECOVERY 0x01 /* Currently in loss recovery */ #define TCPI_FLAG_STREAMING_ON 0x02 /* Streaming detection on */ struct tcp_conn_status { unsigned int probe_activated : 1; unsigned int write_probe_failed : 1; unsigned int read_probe_failed : 1; unsigned int conn_probe_failed : 1; }; /* * Add new fields to this structure at the end only. This will preserve * binary compatibility. */ struct tcp_info { u_int8_t tcpi_state; /* TCP FSM state. */ u_int8_t tcpi_options; /* Options enabled on conn. */ u_int8_t tcpi_snd_wscale; /* RFC1323 send shift value. */ u_int8_t tcpi_rcv_wscale; /* RFC1323 recv shift value. */ u_int32_t tcpi_flags; /* extra flags (TCPI_FLAG_xxx) */ u_int32_t tcpi_rto; /* Retransmission timeout in milliseconds */ u_int32_t tcpi_snd_mss; /* Max segment size for send. */ u_int32_t tcpi_rcv_mss; /* Max segment size for receive. */ u_int32_t tcpi_rttcur; /* Most recent value of RTT */ u_int32_t tcpi_srtt; /* Smoothed RTT */ u_int32_t tcpi_rttvar; /* RTT variance */ u_int32_t tcpi_rttbest; /* Best RTT we've seen */ u_int32_t tcpi_snd_ssthresh; /* Slow start threshold. */ u_int32_t tcpi_snd_cwnd; /* Send congestion window. */ u_int32_t tcpi_rcv_space; /* Advertised recv window. */ u_int32_t tcpi_snd_wnd; /* Advertised send window. */ u_int32_t tcpi_snd_nxt; /* Next egress seqno */ u_int32_t tcpi_rcv_nxt; /* Next ingress seqno */ int32_t tcpi_last_outif; /* if_index of interface used to send last */ u_int32_t tcpi_snd_sbbytes; /* bytes in snd buffer including data inflight */ u_int64_t tcpi_txpackets __attribute__((aligned(8))); /* total packets sent */ u_int64_t tcpi_txbytes __attribute__((aligned(8))); /* total bytes sent */ u_int64_t tcpi_txretransmitbytes __attribute__((aligned(8))); /* total bytes retransmitted */ u_int64_t tcpi_txunacked __attribute__((aligned(8))); /* current number of bytes not acknowledged */ u_int64_t tcpi_rxpackets __attribute__((aligned(8))); /* total packets received */ u_int64_t tcpi_rxbytes __attribute__((aligned(8))); /* total bytes received */ u_int64_t tcpi_rxduplicatebytes __attribute__((aligned(8))); /* total duplicate bytes received */ u_int64_t tcpi_rxoutoforderbytes __attribute__((aligned(8))); /* total out of order bytes received */ u_int64_t tcpi_snd_bw __attribute__((aligned(8))); /* measured send bandwidth in bits/sec */ u_int8_t tcpi_synrexmits; /* Number of syn retransmits before connect */ u_int8_t tcpi_unused1; u_int16_t tcpi_unused2; u_int64_t tcpi_cell_rxpackets __attribute((aligned(8))); /* packets received over cellular */ u_int64_t tcpi_cell_rxbytes __attribute((aligned(8))); /* bytes received over cellular */ u_int64_t tcpi_cell_txpackets __attribute((aligned(8))); /* packets transmitted over cellular */ u_int64_t tcpi_cell_txbytes __attribute((aligned(8))); /* bytes transmitted over cellular */ u_int64_t tcpi_wifi_rxpackets __attribute((aligned(8))); /* packets received over Wi-Fi */ u_int64_t tcpi_wifi_rxbytes __attribute((aligned(8))); /* bytes received over Wi-Fi */ u_int64_t tcpi_wifi_txpackets __attribute((aligned(8))); /* packets transmitted over Wi-Fi */ u_int64_t tcpi_wifi_txbytes __attribute((aligned(8))); /* bytes transmitted over Wi-Fi */ u_int64_t tcpi_wired_rxpackets __attribute((aligned(8))); /* packets received over Wired */ u_int64_t tcpi_wired_rxbytes __attribute((aligned(8))); /* bytes received over Wired */ u_int64_t tcpi_wired_txpackets __attribute((aligned(8))); /* packets transmitted over Wired */ u_int64_t tcpi_wired_txbytes __attribute((aligned(8))); /* bytes transmitted over Wired */ struct tcp_conn_status tcpi_connstatus; /* status of connection probes */ u_int16_t tcpi_tfo_cookie_req:1, /* Cookie requested? */ tcpi_tfo_cookie_rcv:1, /* Cookie received? */ tcpi_tfo_syn_loss:1, /* Fallback to reg. TCP after SYN-loss */ tcpi_tfo_syn_data_sent:1, /* SYN+data has been sent out */ tcpi_tfo_syn_data_acked:1, /* SYN+data has been fully acknowledged */ tcpi_tfo_syn_data_rcv:1, /* Server received SYN+data with a valid cookie */ tcpi_tfo_cookie_req_rcv:1, /* Server received cookie-request */ tcpi_tfo_cookie_sent:1, /* Server announced cookie */ tcpi_tfo_cookie_invalid:1, /* Server received an invalid cookie */ tcpi_tfo_cookie_wrong:1, /* Our sent cookie was wrong */ tcpi_tfo_no_cookie_rcv:1, /* We did not receive a cookie upon our request */ tcpi_tfo_heuristics_disable:1, /* TFO-heuristics disabled it */ tcpi_tfo_send_blackhole:1, /* A sending-blackhole got detected */ tcpi_tfo_recv_blackhole:1; /* A receiver-blackhole got detected */ u_int16_t tcpi_ecn_client_setup:1, /* Attempted ECN setup from client side */ tcpi_ecn_server_setup:1, /* Attempted ECN setup from server side */ tcpi_ecn_success:1, /* peer negotiated ECN */ tcpi_ecn_lost_syn:1, /* Lost SYN with ECN setup */ tcpi_ecn_lost_synack:1, /* Lost SYN-ACK with ECN setup */ tcpi_local_peer:1, /* Local to the host or the subnet */ tcpi_if_cell:1, /* Interface is cellular */ tcpi_if_wifi:1; /* Interface is WiFi */ u_int32_t tcpi_ecn_recv_ce; /* Packets received with CE */ u_int32_t tcpi_ecn_recv_cwr; /* Packets received with CWR */ u_int32_t tcpi_rcvoopack; /* out-of-order packets received */ u_int32_t tcpi_pawsdrop; /* segments dropped due to PAWS */ u_int32_t tcpi_sack_recovery_episode; /* SACK recovery episodes */ u_int32_t tcpi_reordered_pkts; /* packets reorderd */ u_int32_t tcpi_dsack_sent; /* Sent DSACK notification */ u_int32_t tcpi_dsack_recvd; /* Received a valid DSACK option */ u_int32_t tcpi_flowhash; /* Unique id for the connection */ }; struct tcp_measure_bw_burst { u_int32_t min_burst_size; /* Minimum number of packets to use */ u_int32_t max_burst_size; /* Maximum number of packets to use */ }; /* * Note that IPv6 link local addresses should have the appropriate scope ID */ struct info_tuple { u_int8_t itpl_proto; union { struct sockaddr _itpl_sa; struct sockaddr_in _itpl_sin; struct sockaddr_in6 _itpl_sin6; } itpl_localaddr; union { struct sockaddr _itpl_sa; struct sockaddr_in _itpl_sin; struct sockaddr_in6 _itpl_sin6; } itpl_remoteaddr; }; #define itpl_local_sa itpl_localaddr._itpl_sa #define itpl_local_sin itpl_localaddr._itpl_sin #define itpl_local_sin6 itpl_localaddr._itpl_sin6 #define itpl_remote_sa itpl_remoteaddr._itpl_sa #define itpl_remote_sin itpl_remoteaddr._itpl_sin #define itpl_remote_sin6 itpl_remoteaddr._itpl_sin6 /* * TCP connection info auxiliary data (CIAUX_TCP) * * Do not add new fields to this structure, just add them to tcp_info * structure towards the end. This will preserve binary compatibility. */ typedef struct conninfo_tcp { pid_t tcpci_peer_pid; /* loopback peer PID if > 0 */ struct tcp_info tcpci_tcp_info; /* TCP info */ } conninfo_tcp_t; #pragma pack() #endif /* PRIVATE */ struct tcp_connection_info { u_int8_t tcpi_state; /* connection state */ u_int8_t tcpi_snd_wscale; /* Window scale for send window */ u_int8_t tcpi_rcv_wscale; /* Window scale for receive window */ u_int8_t __pad1; u_int32_t tcpi_options; /* TCP options supported */ #define TCPCI_OPT_TIMESTAMPS 0x00000001 /* Timestamps enabled */ #define TCPCI_OPT_SACK 0x00000002 /* SACK enabled */ #define TCPCI_OPT_WSCALE 0x00000004 /* Window scaling enabled */ #define TCPCI_OPT_ECN 0x00000008 /* ECN enabled */ u_int32_t tcpi_flags; /* flags */ #define TCPCI_FLAG_LOSSRECOVERY 0x00000001 #define TCPCI_FLAG_REORDERING_DETECTED 0x00000002 u_int32_t tcpi_rto; /* retransmit timeout in ms */ u_int32_t tcpi_maxseg; /* maximum segment size supported */ u_int32_t tcpi_snd_ssthresh; /* slow start threshold in bytes */ u_int32_t tcpi_snd_cwnd; /* send congestion window in bytes */ u_int32_t tcpi_snd_wnd; /* send widnow in bytes */ u_int32_t tcpi_snd_sbbytes; /* bytes in send socket buffer, including in-flight data */ u_int32_t tcpi_rcv_wnd; /* receive window in bytes*/ u_int32_t tcpi_rttcur; /* most recent RTT in ms */ u_int32_t tcpi_srtt; /* average RTT in ms */ u_int32_t tcpi_rttvar; /* RTT variance */ u_int32_t tcpi_tfo_cookie_req:1, /* Cookie requested? */ tcpi_tfo_cookie_rcv:1, /* Cookie received? */ tcpi_tfo_syn_loss:1, /* Fallback to reg. TCP after SYN-loss */ tcpi_tfo_syn_data_sent:1, /* SYN+data has been sent out */ tcpi_tfo_syn_data_acked:1, /* SYN+data has been fully acknowledged */ tcpi_tfo_syn_data_rcv:1, /* Server received SYN+data with a valid cookie */ tcpi_tfo_cookie_req_rcv:1, /* Server received cookie-request */ tcpi_tfo_cookie_sent:1, /* Server announced cookie */ tcpi_tfo_cookie_invalid:1, /* Server received an invalid cookie */ tcpi_tfo_cookie_wrong:1, /* Our sent cookie was wrong */ tcpi_tfo_no_cookie_rcv:1, /* We did not receive a cookie upon our request */ tcpi_tfo_heuristics_disable:1, /* TFO-heuristics disabled it */ tcpi_tfo_send_blackhole:1, /* A sending-blackhole got detected */ tcpi_tfo_recv_blackhole:1, /* A receiver-blackhole got detected */ __pad2:18; u_int64_t tcpi_txpackets __attribute__((aligned(8))); u_int64_t tcpi_txbytes __attribute__((aligned(8))); u_int64_t tcpi_txretransmitbytes __attribute__((aligned(8))); u_int64_t tcpi_rxpackets __attribute__((aligned(8))); u_int64_t tcpi_rxbytes __attribute__((aligned(8))); u_int64_t tcpi_rxoutoforderbytes __attribute__((aligned(8))); }; #endif /* (_POSIX_C_SOURCE && !_DARWIN_C_SOURCE) */ #endif