/*
- * Copyright (c) 2000-2011 Apple Inc. All rights reserved.
+ * Copyright (c) 2000-2020 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
* 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,
* 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@
*/
/*
* Version 2.0.
*/
-#define _IP_VHL
+#define _IP_VHL
#include <sys/param.h>
#include <net/route.h>
#include <net/ntstat.h>
#include <net/if_var.h>
+#include <net/if.h>
+#include <net/if_types.h>
+#include <net/dlil.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
+#include <netinet/in_tclass.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>
#include <netinet/ip_var.h>
#include <mach/sdt.h>
-#if INET6
#include <netinet6/in6_pcb.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
-#endif
#include <netinet/tcp.h>
-#define TCPOUTFLAGS
+#define TCPOUTFLAGS
+#include <netinet/tcp_cache.h>
#include <netinet/tcp_fsm.h>
#include <netinet/tcp_seq.h>
#include <netinet/tcp_timer.h>
#if TCPDEBUG
#include <netinet/tcp_debug.h>
#endif
+#include <netinet/tcp_log.h>
#include <sys/kdebug.h>
#include <mach/sdt.h>
#include <netinet6/ipsec.h>
#endif /*IPSEC*/
-#if CONFIG_MACF_NET
-#include <security/mac_framework.h>
-#endif /* MAC_SOCKET */
-
-#define DBG_LAYER_BEG NETDBG_CODE(DBG_NETTCP, 1)
-#define DBG_LAYER_END NETDBG_CODE(DBG_NETTCP, 3)
-#define DBG_FNC_TCP_OUTPUT NETDBG_CODE(DBG_NETTCP, (4 << 8) | 1)
-
-#ifdef notyet
-extern struct mbuf *m_copypack();
+#if MPTCP
+#include <netinet/mptcp_var.h>
+#include <netinet/mptcp.h>
+#include <netinet/mptcp_opt.h>
+#include <netinet/mptcp_seq.h>
#endif
-int path_mtu_discovery = 1;
-SYSCTL_INT(_net_inet_tcp, OID_AUTO, path_mtu_discovery, CTLFLAG_RW | CTLFLAG_LOCKED,
- &path_mtu_discovery, 1, "Enable Path MTU Discovery");
+#include <corecrypto/ccaes.h>
+
+#define DBG_LAYER_BEG NETDBG_CODE(DBG_NETTCP, 1)
+#define DBG_LAYER_END NETDBG_CODE(DBG_NETTCP, 3)
+#define DBG_FNC_TCP_OUTPUT NETDBG_CODE(DBG_NETTCP, (4 << 8) | 1)
-int ss_fltsz = 1;
-SYSCTL_INT(_net_inet_tcp, OID_AUTO, slowstart_flightsize, CTLFLAG_RW | CTLFLAG_LOCKED,
- &ss_fltsz, 1, "Slow start flight size");
+SYSCTL_SKMEM_TCP_INT(OID_AUTO, path_mtu_discovery,
+ CTLFLAG_RW | CTLFLAG_LOCKED, int, path_mtu_discovery, 1,
+ "Enable Path MTU Discovery");
-int ss_fltsz_local = 8; /* starts with eight segments max */
-SYSCTL_INT(_net_inet_tcp, OID_AUTO, local_slowstart_flightsize, CTLFLAG_RW | CTLFLAG_LOCKED,
- &ss_fltsz_local, 1, "Slow start flight size for local networks");
+SYSCTL_SKMEM_TCP_INT(OID_AUTO, local_slowstart_flightsize,
+ CTLFLAG_RW | CTLFLAG_LOCKED, int, ss_fltsz_local, 8,
+ "Slow start flight size for local networks");
-int tcp_do_tso = 1;
+int tcp_do_tso = 1;
SYSCTL_INT(_net_inet_tcp, OID_AUTO, tso, CTLFLAG_RW | CTLFLAG_LOCKED,
- &tcp_do_tso, 0, "Enable TCP Segmentation Offload");
+ &tcp_do_tso, 0, "Enable TCP Segmentation Offload");
+
+SYSCTL_SKMEM_TCP_INT(OID_AUTO, ecn_setup_percentage,
+ CTLFLAG_RW | CTLFLAG_LOCKED, int, tcp_ecn_setup_percentage, 100,
+ "Max ECN setup percentage");
+
+SYSCTL_SKMEM_TCP_INT(OID_AUTO, do_ack_compression,
+ CTLFLAG_RW | CTLFLAG_LOCKED, int, tcp_do_ack_compression, 1,
+ "Enable TCP ACK compression (on (cell only): 1, off: 0, on (all interfaces): 2)");
+
+SYSCTL_SKMEM_TCP_INT(OID_AUTO, ack_compression_rate,
+ CTLFLAG_RW | CTLFLAG_LOCKED, int, tcp_ack_compression_rate, TCP_COMP_CHANGE_RATE,
+ "Rate at which we force sending new ACKs (in ms)");
+
+SYSCTL_SKMEM_TCP_INT(OID_AUTO, randomize_timestamps,
+ CTLFLAG_RW | CTLFLAG_LOCKED, int, tcp_randomize_timestamps, 1,
+ "Randomize TCP timestamps to prevent tracking (on: 1, off: 0)");
+
+static int
+sysctl_change_ecn_setting SYSCTL_HANDLER_ARGS
+{
+#pragma unused(oidp, arg1, arg2)
+ int i, err = 0, changed = 0;
+ struct ifnet *ifp;
+
+ err = sysctl_io_number(req, tcp_ecn_outbound, sizeof(int32_t),
+ &i, &changed);
+ if (err != 0 || req->newptr == USER_ADDR_NULL) {
+ return err;
+ }
+
+ if (changed) {
+ if ((tcp_ecn_outbound == 0 || tcp_ecn_outbound == 1) &&
+ (i == 0 || i == 1)) {
+ tcp_ecn_outbound = i;
+ SYSCTL_SKMEM_UPDATE_FIELD(tcp.ecn_initiate_out, tcp_ecn_outbound);
+ return err;
+ }
+ if (tcp_ecn_outbound == 2 && (i == 0 || i == 1)) {
+ /*
+ * Reset ECN enable flags on non-cellular
+ * interfaces so that the system default will take
+ * over
+ */
+ ifnet_head_lock_shared();
+ TAILQ_FOREACH(ifp, &ifnet_head, if_link) {
+ if (!IFNET_IS_CELLULAR(ifp)) {
+ if_clear_eflags(ifp,
+ IFEF_ECN_ENABLE |
+ IFEF_ECN_DISABLE);
+ }
+ }
+ ifnet_head_done();
+ } else {
+ /*
+ * Set ECN enable flags on non-cellular
+ * interfaces
+ */
+ ifnet_head_lock_shared();
+ TAILQ_FOREACH(ifp, &ifnet_head, if_link) {
+ if (!IFNET_IS_CELLULAR(ifp)) {
+ if_set_eflags(ifp, IFEF_ECN_ENABLE);
+ if_clear_eflags(ifp, IFEF_ECN_DISABLE);
+ }
+ }
+ ifnet_head_done();
+ }
+ tcp_ecn_outbound = i;
+ SYSCTL_SKMEM_UPDATE_FIELD(tcp.ecn_initiate_out, tcp_ecn_outbound);
+ }
+ /* Change the other one too as the work is done */
+ if (i == 2 || tcp_ecn_inbound == 2) {
+ tcp_ecn_inbound = i;
+ SYSCTL_SKMEM_UPDATE_FIELD(tcp.ecn_negotiate_in, tcp_ecn_inbound);
+ }
+ return err;
+}
+
+int tcp_ecn_outbound = 2;
+SYSCTL_PROC(_net_inet_tcp, OID_AUTO, ecn_initiate_out,
+ CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, &tcp_ecn_outbound, 0,
+ sysctl_change_ecn_setting, "IU",
+ "Initiate ECN for outbound connections");
+int tcp_ecn_inbound = 2;
+SYSCTL_PROC(_net_inet_tcp, OID_AUTO, ecn_negotiate_in,
+ CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, &tcp_ecn_inbound, 0,
+ sysctl_change_ecn_setting, "IU",
+ "Initiate ECN for inbound connections");
-int tcp_ecn_outbound = 0;
-SYSCTL_INT(_net_inet_tcp, OID_AUTO, ecn_initiate_out, CTLFLAG_RW | CTLFLAG_LOCKED, &tcp_ecn_outbound,
- 0, "Initiate ECN for outbound connections");
+SYSCTL_SKMEM_TCP_INT(OID_AUTO, packetchain,
+ CTLFLAG_RW | CTLFLAG_LOCKED, int, tcp_packet_chaining, 50,
+ "Enable TCP output packet chaining");
-int tcp_ecn_inbound = 0;
-SYSCTL_INT(_net_inet_tcp, OID_AUTO, ecn_negotiate_in, CTLFLAG_RW | CTLFLAG_LOCKED, &tcp_ecn_inbound,
- 0, "Allow ECN negotiation for inbound connections");
+SYSCTL_SKMEM_TCP_INT(OID_AUTO, socket_unlocked_on_output,
+ CTLFLAG_RW | CTLFLAG_LOCKED, int, tcp_output_unlocked, 1,
+ "Unlock TCP when sending packets down to IP");
-int tcp_packet_chaining = 50;
-SYSCTL_INT(_net_inet_tcp, OID_AUTO, packetchain, CTLFLAG_RW | CTLFLAG_LOCKED, &tcp_packet_chaining,
- 0, "Enable TCP output packet chaining");
+SYSCTL_SKMEM_TCP_INT(OID_AUTO, min_iaj_win,
+ CTLFLAG_RW | CTLFLAG_LOCKED, int, tcp_min_iaj_win, MIN_IAJ_WIN,
+ "Minimum recv win based on inter-packet arrival jitter");
-int tcp_output_unlocked = 1;
-SYSCTL_INT(_net_inet_tcp, OID_AUTO, socket_unlocked_on_output, CTLFLAG_RW | CTLFLAG_LOCKED, &tcp_output_unlocked,
- 0, "Unlock TCP when sending packets down to IP");
+SYSCTL_SKMEM_TCP_INT(OID_AUTO, acc_iaj_react_limit,
+ CTLFLAG_RW | CTLFLAG_LOCKED, int, tcp_acc_iaj_react_limit,
+ ACC_IAJ_REACT_LIMIT, "Accumulated IAJ when receiver starts to react");
-int tcp_do_rfc3390 = 1;
-SYSCTL_INT(_net_inet_tcp, OID_AUTO, rfc3390, CTLFLAG_RW | CTLFLAG_LOCKED,
- &tcp_do_rfc3390, 1, "Calculate intial slowstart cwnd depending on MSS");
+SYSCTL_SKMEM_TCP_INT(OID_AUTO, autosndbufinc,
+ CTLFLAG_RW | CTLFLAG_LOCKED, uint32_t, tcp_autosndbuf_inc,
+ 8 * 1024, "Increment in send socket bufffer size");
-int tcp_min_iaj_win = MIN_IAJ_WIN;
-SYSCTL_INT(_net_inet_tcp, OID_AUTO, min_iaj_win, CTLFLAG_RW | CTLFLAG_LOCKED,
- &tcp_min_iaj_win, 1, "Minimum recv win based on inter-packet arrival jitter");
+SYSCTL_SKMEM_TCP_INT(OID_AUTO, autosndbufmax,
+ CTLFLAG_RW | CTLFLAG_LOCKED, uint32_t, tcp_autosndbuf_max, 2 * 1024 * 1024,
+ "Maximum send socket buffer size");
-int tcp_acc_iaj_react_limit = ACC_IAJ_REACT_LIMIT;
-SYSCTL_INT(_net_inet_tcp, OID_AUTO, acc_iaj_react_limit, CTLFLAG_RW | CTLFLAG_LOCKED,
- &tcp_acc_iaj_react_limit, 1, "Accumulated IAJ when receiver starts to react");
+SYSCTL_SKMEM_TCP_INT(OID_AUTO, rtt_recvbg,
+ CTLFLAG_RW | CTLFLAG_LOCKED, uint32_t, tcp_use_rtt_recvbg, 1,
+ "Use RTT for bg recv algorithm");
+
+SYSCTL_SKMEM_TCP_INT(OID_AUTO, recv_throttle_minwin,
+ CTLFLAG_RW | CTLFLAG_LOCKED, uint32_t, tcp_recv_throttle_minwin, 16 * 1024,
+ "Minimum recv win for throttling");
+
+SYSCTL_SKMEM_TCP_INT(OID_AUTO, enable_tlp,
+ CTLFLAG_RW | CTLFLAG_LOCKED,
+ int32_t, tcp_enable_tlp, 1, "Enable Tail loss probe");
static int32_t packchain_newlist = 0;
static int32_t packchain_looped = 0;
extern int ipsec_bypass;
#endif
-extern int slowlink_wsize; /* window correction for slow links */
-#if IPFIREWALL
-extern int fw_enable; /* firewall check for packet chaining */
-extern int fw_bypass; /* firewall check: disable packet chaining if there is rules */
-#endif /* IPFIREWALL */
-
-extern vm_size_t so_cache_zone_element_size;
-#if RANDOM_IP_ID
-extern int ip_use_randomid;
-#endif /* RANDOM_IP_ID */
-extern u_int32_t dlil_filter_count;
+extern int slowlink_wsize; /* window correction for slow links */
+
+extern u_int32_t dlil_filter_disable_tso_count;
extern u_int32_t kipf_count;
-extern int tcp_recv_bg;
-static int tcp_ip_output(struct socket *, struct tcpcb *, struct mbuf *, int,
- struct mbuf *, int, int, int32_t);
+static int tcp_ip_output(struct socket *, struct tcpcb *, struct mbuf *,
+ int, struct mbuf *, int, int, boolean_t);
+static int tcp_recv_throttle(struct tcpcb *tp);
+
+static int32_t
+tcp_tfo_check(struct tcpcb *tp, int32_t len)
+{
+ struct socket *so = tp->t_inpcb->inp_socket;
+ unsigned int optlen = 0;
+ unsigned int cookie_len;
+
+ if (tp->t_flags & TF_NOOPT) {
+ goto fallback;
+ }
+
+ if (!(tp->t_flagsext & TF_FASTOPEN_FORCE_ENABLE) &&
+ !tcp_heuristic_do_tfo(tp)) {
+ tp->t_tfo_stats |= TFO_S_HEURISTICS_DISABLE;
+ tcpstat.tcps_tfo_heuristics_disable++;
+ goto fallback;
+ }
+
+ if (so->so_flags1 & SOF1_DATA_AUTHENTICATED) {
+ return len;
+ }
+
+ optlen += TCPOLEN_MAXSEG;
+
+ if (tp->t_flags & TF_REQ_SCALE) {
+ optlen += 4;
+ }
+
+#if MPTCP
+ if ((so->so_flags & SOF_MP_SUBFLOW) && mptcp_enable &&
+ (tp->t_rxtshift <= mptcp_mpcap_retries ||
+ (tptomptp(tp)->mpt_mpte->mpte_flags & MPTE_FORCE_ENABLE))) {
+ optlen += sizeof(struct mptcp_mpcapable_opt_common) + sizeof(mptcp_key_t);
+ }
+#endif /* MPTCP */
+
+ if (tp->t_flags & TF_REQ_TSTMP) {
+ optlen += TCPOLEN_TSTAMP_APPA;
+ }
+
+ if (SACK_ENABLED(tp)) {
+ optlen += TCPOLEN_SACK_PERMITTED;
+ }
+
+ /* Now, decide whether to use TFO or not */
+
+ /* Don't even bother trying if there is no space at all... */
+ if (MAX_TCPOPTLEN - optlen < TCPOLEN_FASTOPEN_REQ) {
+ goto fallback;
+ }
+
+ cookie_len = tcp_cache_get_cookie_len(tp);
+ if (cookie_len == 0) {
+ /* No cookie, so we request one */
+ return 0;
+ }
+
+ /* There is not enough space for the cookie, so we cannot do TFO */
+ if (MAX_TCPOPTLEN - optlen < cookie_len) {
+ goto fallback;
+ }
+
+ /* Do not send SYN+data if there is more in the queue than MSS */
+ if (so->so_snd.sb_cc > (tp->t_maxopd - MAX_TCPOPTLEN)) {
+ goto fallback;
+ }
+
+ /* Ok, everything looks good. We can go on and do TFO */
+ return len;
+
+fallback:
+ tcp_disable_tfo(tp);
+ return 0;
+}
+
+/* Returns the number of bytes written to the TCP option-space */
+static unsigned int
+tcp_tfo_write_cookie_rep(struct tcpcb *tp, unsigned int optlen, u_char *opt)
+{
+ u_char out[CCAES_BLOCK_SIZE];
+ unsigned ret = 0;
+ u_char *bp;
+
+ if ((MAX_TCPOPTLEN - optlen) <
+ (TCPOLEN_FASTOPEN_REQ + TFO_COOKIE_LEN_DEFAULT)) {
+ return ret;
+ }
+
+ tcp_tfo_gen_cookie(tp->t_inpcb, out, sizeof(out));
+
+ bp = opt + optlen;
+
+ *bp++ = TCPOPT_FASTOPEN;
+ *bp++ = 2 + TFO_COOKIE_LEN_DEFAULT;
+ memcpy(bp, out, TFO_COOKIE_LEN_DEFAULT);
+ ret += 2 + TFO_COOKIE_LEN_DEFAULT;
+
+ tp->t_tfo_stats |= TFO_S_COOKIE_SENT;
+ tcpstat.tcps_tfo_cookie_sent++;
+
+ return ret;
+}
+
+static unsigned int
+tcp_tfo_write_cookie(struct tcpcb *tp, unsigned int optlen, int32_t len,
+ u_char *opt)
+{
+ uint8_t tfo_len;
+ struct socket *so = tp->t_inpcb->inp_socket;
+ unsigned ret = 0;
+ int res;
+ u_char *bp;
+
+ if (TCPOLEN_FASTOPEN_REQ > MAX_TCPOPTLEN - optlen) {
+ return 0;
+ }
+ tfo_len = (uint8_t)(MAX_TCPOPTLEN - optlen - TCPOLEN_FASTOPEN_REQ);
+
+ if (so->so_flags1 & SOF1_DATA_AUTHENTICATED) {
+ /* If there is some data, let's track it */
+ if (len > 0) {
+ tp->t_tfo_stats |= TFO_S_SYN_DATA_SENT;
+ tcpstat.tcps_tfo_syn_data_sent++;
+ }
+
+ return 0;
+ }
+
+ bp = opt + optlen;
+
+ /*
+ * The cookie will be copied in the appropriate place within the
+ * TCP-option space. That way we avoid the need for an intermediate
+ * variable.
+ */
+ res = tcp_cache_get_cookie(tp, bp + TCPOLEN_FASTOPEN_REQ, &tfo_len);
+ if (res == 0) {
+ *bp++ = TCPOPT_FASTOPEN;
+ *bp++ = TCPOLEN_FASTOPEN_REQ;
+ ret += TCPOLEN_FASTOPEN_REQ;
+
+ tp->t_tfo_flags |= TFO_F_COOKIE_REQ;
+
+ tp->t_tfo_stats |= TFO_S_COOKIE_REQ;
+ tcpstat.tcps_tfo_cookie_req++;
+ } else {
+ *bp++ = TCPOPT_FASTOPEN;
+ *bp++ = TCPOLEN_FASTOPEN_REQ + tfo_len;
+
+ ret += TCPOLEN_FASTOPEN_REQ + tfo_len;
+
+ tp->t_tfo_flags |= TFO_F_COOKIE_SENT;
+
+ /* If there is some data, let's track it */
+ if (len > 0) {
+ tp->t_tfo_stats |= TFO_S_SYN_DATA_SENT;
+ tcpstat.tcps_tfo_syn_data_sent++;
+ }
+ }
+
+ return ret;
+}
-static inline int is_tcp_recv_bg(struct socket *so);
+static inline bool
+tcp_send_ecn_flags_on_syn(struct tcpcb *tp)
+{
+ return !(tp->ecn_flags & TE_SETUPSENT);
+}
-static __inline__ u_int16_t
-get_socket_id(struct socket * s)
+void
+tcp_set_ecn(struct tcpcb *tp, struct ifnet *ifp)
{
- u_int16_t val;
+ boolean_t inbound;
+
+ /*
+ * Socket option has precedence
+ */
+ if (tp->ecn_flags & TE_ECN_MODE_ENABLE) {
+ tp->ecn_flags |= TE_ENABLE_ECN;
+ goto check_heuristic;
+ }
+
+ if (tp->ecn_flags & TE_ECN_MODE_DISABLE) {
+ tp->ecn_flags &= ~TE_ENABLE_ECN;
+ return;
+ }
+ /*
+ * Per interface setting comes next
+ */
+ if (ifp != NULL) {
+ if (ifp->if_eflags & IFEF_ECN_ENABLE) {
+ tp->ecn_flags |= TE_ENABLE_ECN;
+ goto check_heuristic;
+ }
- if (so_cache_zone_element_size == 0) {
- return (0);
+ if (ifp->if_eflags & IFEF_ECN_DISABLE) {
+ tp->ecn_flags &= ~TE_ENABLE_ECN;
+ return;
+ }
+ }
+ /*
+ * System wide settings come last
+ */
+ inbound = (tp->t_inpcb->inp_socket->so_head != NULL);
+ if ((inbound && tcp_ecn_inbound == 1) ||
+ (!inbound && tcp_ecn_outbound == 1)) {
+ tp->ecn_flags |= TE_ENABLE_ECN;
+ goto check_heuristic;
+ } else {
+ tp->ecn_flags &= ~TE_ENABLE_ECN;
+ }
+
+ return;
+
+check_heuristic:
+ if (!tcp_heuristic_do_ecn(tp)) {
+ tp->ecn_flags &= ~TE_ENABLE_ECN;
}
- val = (u_int16_t)(((uintptr_t)s) / so_cache_zone_element_size);
- if (val == 0) {
- val = 0xffff;
+
+ /*
+ * If the interface setting, system-level setting and heuristics
+ * allow to enable ECN, randomly select 5% of connections to
+ * enable it
+ */
+ if ((tp->ecn_flags & (TE_ECN_MODE_ENABLE | TE_ECN_MODE_DISABLE
+ | TE_ENABLE_ECN)) == TE_ENABLE_ECN) {
+ /*
+ * Use the random value in iss for randomizing
+ * this selection
+ */
+ if ((tp->iss % 100) >= tcp_ecn_setup_percentage) {
+ tp->ecn_flags &= ~TE_ENABLE_ECN;
+ }
}
- return (val);
}
-static inline int
-is_tcp_recv_bg(struct socket *so)
+int
+tcp_flight_size(struct tcpcb *tp)
{
- return (so->so_traffic_mgt_flags & TRAFFIC_MGT_TCP_RECVBG);
+ int ret;
+
+ VERIFY(tp->sackhint.sack_bytes_acked >= 0);
+ VERIFY(tp->sackhint.sack_bytes_rexmit >= 0);
+
+ /*
+ * RFC6675, SetPipe (), SACK'd bytes are discounted. All the rest is still in-flight.
+ */
+ ret = tp->snd_nxt - tp->snd_una - tp->sackhint.sack_bytes_acked;
+
+ if (ret < 0) {
+ /*
+ * This happens when the RTO-timer fires because snd_nxt gets artificially
+ * decreased. If we then receive some SACK-blogs, sack_bytes_acked is
+ * going to be high.
+ */
+ ret = 0;
+ }
+
+ return ret;
}
/*
* ip_output_list:EMSGSIZE
* ip_output_list:ENOBUFS
* ip_output_list:??? [ignorable: mostly IPSEC/firewall/DLIL]
- * ip6_output:??? [IPV6 only]
+ * ip6_output_list:EINVAL
+ * ip6_output_list:EOPNOTSUPP
+ * ip6_output_list:EHOSTUNREACH
+ * ip6_output_list:EADDRNOTAVAIL
+ * ip6_output_list:ENETUNREACH
+ * ip6_output_list:EMSGSIZE
+ * ip6_output_list:ENOBUFS
+ * ip6_output_list:??? [ignorable: mostly IPSEC/firewall/DLIL]
*/
int
tcp_output(struct tcpcb *tp)
{
- struct socket *so = tp->t_inpcb->inp_socket;
+ struct inpcb *inp = tp->t_inpcb;
+ struct socket *so = inp->inp_socket;
int32_t len, recwin, sendwin, off;
- int flags, error;
- register struct mbuf *m;
+ uint8_t flags;
+ int error;
+ struct mbuf *m;
struct ip *ip = NULL;
- register struct ipovly *ipov = NULL;
-#if INET6
struct ip6_hdr *ip6 = NULL;
-#endif /* INET6 */
- register struct tcphdr *th;
+ struct tcphdr *th;
u_char opt[TCP_MAXOLEN];
- unsigned ipoptlen, optlen, hdrlen;
+ unsigned int ipoptlen, optlen, hdrlen;
int idle, sendalot, lost = 0;
int i, sack_rxmit;
int tso = 0;
int sack_bytes_rxmt;
+ tcp_seq old_snd_nxt = 0;
struct sackhole *p;
-#ifdef IPSEC
- unsigned ipsec_optlen = 0;
-#endif
- int last_off = 0;
- int m_off;
+#if IPSEC
+ unsigned int ipsec_optlen = 0;
+#endif /* IPSEC */
int idle_time = 0;
- struct mbuf *m_lastm = NULL;
- struct mbuf *m_head = NULL;
struct mbuf *packetlist = NULL;
- struct mbuf *tp_inp_options = tp->t_inpcb->inp_depend4.inp4_options;
-#if INET6
- int isipv6 = tp->t_inpcb->inp_vflag & INP_IPV6 ;
- struct ip6_pktopts *inp6_pktopts = tp->t_inpcb->inp_depend6.inp6_outputopts;
-#endif
- short packchain_listadd = 0;
- u_int16_t socket_id = get_socket_id(so);
+ struct mbuf *tp_inp_options = inp->inp_depend4.inp4_options;
+ int isipv6 = inp->inp_vflag & INP_IPV6;
+ int packchain_listadd = 0;
int so_options = so->so_options;
struct rtentry *rt;
+ u_int32_t svc_flags = 0, allocated_len;
+ unsigned int sackoptlen = 0;
+#if MPTCP
+ boolean_t mptcp_acknow;
+#endif /* MPTCP */
+ boolean_t cell = FALSE;
+ boolean_t wifi = FALSE;
+ boolean_t wired = FALSE;
+ boolean_t sack_rescue_rxt = FALSE;
+ int sotc = so->so_traffic_class;
+ boolean_t do_not_compress = FALSE;
+ boolean_t sack_rxmted = FALSE;
/*
* Determine length of data that should be transmitted,
* will take care of wrap around of tcp_now
*/
idle_time = tcp_now - tp->t_rcvtime;
- if (idle && idle_time >= tp->t_rxtcur) {
- if (CC_ALGO(tp)->after_idle != NULL)
+ if (idle && idle_time >= TCP_IDLETIMEOUT(tp)) {
+ if (CC_ALGO(tp)->after_idle != NULL &&
+ (tp->tcp_cc_index != TCP_CC_ALGO_CUBIC_INDEX ||
+ idle_time >= TCP_CC_CWND_NONVALIDATED_PERIOD)) {
CC_ALGO(tp)->after_idle(tp);
- DTRACE_TCP5(cc, void, NULL, struct inpcb *, tp->t_inpcb,
- struct tcpcb *, tp, struct tcphdr *, NULL,
- int32_t, TCP_CC_IDLE_TIMEOUT);
+ tcp_ccdbg_trace(tp, NULL, TCP_CC_IDLE_TIMEOUT);
+ }
+
+ /*
+ * Do some other tasks that need to be done after
+ * idle time
+ */
+ if (!SLIST_EMPTY(&tp->t_rxt_segments)) {
+ tcp_rxtseg_clean(tp);
+ }
+
+ /* If stretch ack was auto-disabled, re-evaluate it */
+ tcp_cc_after_idle_stretchack(tp);
+ tp->t_forced_acks = TCP_FORCED_ACKS_COUNT;
}
tp->t_flags &= ~TF_LASTIDLE;
if (idle) {
idle = 0;
}
}
+#if MPTCP
+ if (tp->t_mpflags & TMPF_RESET) {
+ tcp_check_timer_state(tp);
+ /*
+ * Once a RST has been sent for an MPTCP subflow,
+ * the subflow socket stays around until deleted.
+ * No packets such as FINs must be sent after RST.
+ */
+ return 0;
+ }
+#endif /* MPTCP */
+
again:
- KERNEL_DEBUG(DBG_FNC_TCP_OUTPUT | DBG_FUNC_START, 0,0,0,0,0);
+#if MPTCP
+ mptcp_acknow = FALSE;
+#endif
+ do_not_compress = FALSE;
+
+ KERNEL_DEBUG(DBG_FNC_TCP_OUTPUT | DBG_FUNC_START, 0, 0, 0, 0, 0);
-#if INET6
if (isipv6) {
-
KERNEL_DEBUG(DBG_LAYER_BEG,
- ((tp->t_inpcb->inp_fport << 16) | tp->t_inpcb->inp_lport),
- (((tp->t_inpcb->in6p_laddr.s6_addr16[0] & 0xffff) << 16) |
- (tp->t_inpcb->in6p_faddr.s6_addr16[0] & 0xffff)),
- sendalot,0,0);
- }
- else
-#endif
-
- {
+ ((inp->inp_fport << 16) | inp->inp_lport),
+ (((inp->in6p_laddr.s6_addr16[0] & 0xffff) << 16) |
+ (inp->in6p_faddr.s6_addr16[0] & 0xffff)),
+ sendalot, 0, 0);
+ } else {
KERNEL_DEBUG(DBG_LAYER_BEG,
- ((tp->t_inpcb->inp_fport << 16) | tp->t_inpcb->inp_lport),
- (((tp->t_inpcb->inp_laddr.s_addr & 0xffff) << 16) |
- (tp->t_inpcb->inp_faddr.s_addr & 0xffff)),
- sendalot,0,0);
+ ((inp->inp_fport << 16) | inp->inp_lport),
+ (((inp->inp_laddr.s_addr & 0xffff) << 16) |
+ (inp->inp_faddr.s_addr & 0xffff)),
+ sendalot, 0, 0);
+ }
/*
* If the route generation id changed, we need to check that our
* local (source) IP address is still valid. If it isn't either
* return error or silently do nothing (assuming the address will
* come back before the TCP connection times out).
*/
- rt = tp->t_inpcb->inp_route.ro_rt;
- if (rt != NULL && (!(rt->rt_flags & RTF_UP) ||
- rt->generation_id != route_generation)) {
+ rt = inp->inp_route.ro_rt;
+ if (rt != NULL && ROUTE_UNUSABLE(&tp->t_inpcb->inp_route)) {
struct ifnet *ifp;
- struct in_ifaddr *ia;
+ struct in_ifaddr *ia = NULL;
+ struct in6_ifaddr *ia6 = NULL;
+ int found_srcaddr = 0;
/* disable multipages at the socket */
somultipages(so, FALSE);
/* Disable TSO for the socket until we know more */
tp->t_flags &= ~TF_TSO;
+ soif2kcl(so, FALSE);
+
+ if (isipv6) {
+ ia6 = ifa_foraddr6(&inp->in6p_laddr);
+ if (ia6 != NULL) {
+ found_srcaddr = 1;
+ }
+ } else {
+ ia = ifa_foraddr(inp->inp_laddr.s_addr);
+ if (ia != NULL) {
+ found_srcaddr = 1;
+ }
+ }
+
/* check that the source address is still valid */
- if ((ia = ifa_foraddr(tp->t_inpcb->inp_laddr.s_addr)) == NULL) {
+ if (found_srcaddr == 0) {
+ soevent(so,
+ (SO_FILT_HINT_LOCKED | SO_FILT_HINT_NOSRCADDR));
if (tp->t_state >= TCPS_CLOSE_WAIT) {
tcp_drop(tp, EADDRNOTAVAIL);
- return(EADDRNOTAVAIL);
+ return EADDRNOTAVAIL;
}
- /* set Retransmit timer if it wasn't set
+ /*
+ * Set retransmit timer if it wasn't set,
* reset Persist timer and shift register as the
* advertised peer window may not be valid anymore
*/
-
- if (!tp->t_timer[TCPT_REXMT]) {
- tp->t_timer[TCPT_REXMT] = OFFSET_FROM_START(tp, tp->t_rxtcur);
- if (tp->t_timer[TCPT_PERSIST]) {
+ if (tp->t_timer[TCPT_REXMT] == 0) {
+ tp->t_timer[TCPT_REXMT] =
+ OFFSET_FROM_START(tp, tp->t_rxtcur);
+ if (tp->t_timer[TCPT_PERSIST] != 0) {
tp->t_timer[TCPT_PERSIST] = 0;
- tp->t_rxtshift = 0;
tp->t_persist_stop = 0;
- tp->rxt_start = 0;
+ TCP_RESET_REXMT_STATE(tp);
}
}
- if (tp->t_pktlist_head != NULL)
+ if (tp->t_pktlist_head != NULL) {
m_freem_list(tp->t_pktlist_head);
+ }
TCP_PKTLIST_CLEAR(tp);
/* drop connection if source address isn't available */
- if (so->so_flags & SOF_NOADDRAVAIL) {
+ if (so->so_flags & SOF_NOADDRAVAIL) {
tcp_drop(tp, EADDRNOTAVAIL);
- return(EADDRNOTAVAIL);
- }
- else {
+ return EADDRNOTAVAIL;
+ } else {
tcp_check_timer_state(tp);
- return(0); /* silently ignore, keep data in socket: address may be back */
+ return 0; /* silently ignore, keep data in socket: address may be back */
}
}
- IFA_REMREF(&ia->ia_ifa);
+ if (ia != NULL) {
+ IFA_REMREF(&ia->ia_ifa);
+ }
+
+ if (ia6 != NULL) {
+ IFA_REMREF(&ia6->ia_ifa);
+ }
/*
* Address is still valid; check for multipages capability
if ((ifp = rt->rt_ifp) != NULL) {
somultipages(so, (ifp->if_hwassist & IFNET_MULTIPAGES));
tcp_set_tso(tp, ifp);
+ soif2kcl(so, (ifp->if_eflags & IFEF_2KCL));
+ tcp_set_ecn(tp, ifp);
+ }
+ if (rt->rt_flags & RTF_UP) {
+ RT_GENID_SYNC(rt);
}
- if (rt->rt_flags & RTF_UP)
- rt->generation_id = route_generation;
/*
* See if we should do MTU discovery. Don't do it if:
* 1) it is disabled via the sysctl
* 2) the route isn't up
- * 3) the MTU is locked (if it is, then discovery has been
- * disabled)
+ * 3) the MTU is locked (if it is, then discovery
+ * has been disabled)
*/
- if (!path_mtu_discovery || ((rt != NULL) &&
- (!(rt->rt_flags & RTF_UP) || (rt->rt_rmx.rmx_locks & RTV_MTU))))
+ if (!path_mtu_discovery || ((rt != NULL) &&
+ (!(rt->rt_flags & RTF_UP) ||
+ (rt->rt_rmx.rmx_locks & RTV_MTU)))) {
tp->t_flags &= ~TF_PMTUD;
- else
+ } else {
tp->t_flags |= TF_PMTUD;
+ }
RT_UNLOCK(rt);
- }
+ }
+
+ if (rt != NULL) {
+ cell = IFNET_IS_CELLULAR(rt->rt_ifp);
+ wifi = (!cell && IFNET_IS_WIFI(rt->rt_ifp));
+ wired = (!wifi && IFNET_IS_WIRED(rt->rt_ifp));
}
/*
* snd_nxt. There may be SACK information that allows us to avoid
* resending already delivered data. Adjust snd_nxt accordingly.
*/
- if (tp->sack_enable && SEQ_LT(tp->snd_nxt, tp->snd_max))
+ if (SACK_ENABLED(tp) && SEQ_LT(tp->snd_nxt, tp->snd_max)) {
tcp_sack_adjust(tp);
+ }
sendalot = 0;
off = tp->snd_nxt - tp->snd_una;
sendwin = min(tp->snd_wnd, tp->snd_cwnd);
- if (tp->t_flags & TF_SLOWLINK && slowlink_wsize > 0)
+ if (tp->t_flags & TF_SLOWLINK && slowlink_wsize > 0) {
sendwin = min(sendwin, slowlink_wsize);
+ }
flags = tcp_outflags[tp->t_state];
/*
- * Send any SACK-generated retransmissions. If we're explicitly trying
- * to send out new data (when sendalot is 1), bypass this function.
- * If we retransmit in fast recovery mode, decrement snd_cwnd, since
- * we're replacing a (future) new transmission with a retransmission
- * now, and we previously incremented snd_cwnd in tcp_input().
+ * Send any SACK-generated retransmissions. If we're explicitly
+ * trying to send out new data (when sendalot is 1), bypass this
+ * function. If we retransmit in fast recovery mode, decrement
+ * snd_cwnd, since we're replacing a (future) new transmission
+ * with a retransmission now, and we previously incremented
+ * snd_cwnd in tcp_input().
*/
/*
* Still in sack recovery , reset rxmit flag to zero.
sack_bytes_rxmt = 0;
len = 0;
p = NULL;
- if (tp->sack_enable && IN_FASTRECOVERY(tp) &&
+ if (SACK_ENABLED(tp) && IN_FASTRECOVERY(tp) &&
(p = tcp_sack_output(tp, &sack_bytes_rxmt))) {
int32_t cwin;
-
- cwin = min(tp->snd_wnd, tp->snd_cwnd) - sack_bytes_rxmt;
- if (cwin < 0)
+
+ if (tcp_do_better_lr) {
+ cwin = min(tp->snd_wnd, tp->snd_cwnd) - tcp_flight_size(tp);
+ if (cwin <= 0 && sack_rxmted == FALSE) {
+ /* Allow to clock out at least on per period */
+ cwin = tp->t_maxseg;
+ }
+
+ sack_rxmted = TRUE;
+ } else {
+ cwin = min(tp->snd_wnd, tp->snd_cwnd) - sack_bytes_rxmt;
+ }
+ if (cwin < 0) {
cwin = 0;
+ }
/* Do not retransmit SACK segments beyond snd_recover */
if (SEQ_GT(p->end, tp->snd_recover)) {
/*
*/
p = NULL;
goto after_sack_rexmit;
- } else
+ } else {
/* Can rexmit part of the current hole */
len = ((int32_t)min(cwin,
- tp->snd_recover - p->rxmit));
- } else
+ tp->snd_recover - p->rxmit));
+ }
+ } else {
len = ((int32_t)min(cwin, p->end - p->rxmit));
+ }
if (len > 0) {
- off = p->rxmit - tp->snd_una; /* update off only if we really transmit SACK data */
+ off = p->rxmit - tp->snd_una;
sack_rxmit = 1;
sendalot = 1;
+ /* Everything sent after snd_nxt will allow us to account for fast-retransmit of the retransmitted segment */
+ tp->send_highest_sack = tp->snd_nxt;
+ tp->t_new_dupacks = 0;
tcpstat.tcps_sack_rexmits++;
tcpstat.tcps_sack_rexmit_bytes +=
min(len, tp->t_maxseg);
- if (nstat_collect) {
- nstat_route_tx(tp->t_inpcb->inp_route.ro_rt, 1, min(len, tp->t_maxseg), NSTAT_TX_FLAG_RETRANSMIT);
- locked_add_64(&tp->t_inpcb->inp_stat->txpackets, 1);
- locked_add_64(&tp->t_inpcb->inp_stat->txbytes, min(len, tp->t_maxseg));
- tp->t_stat.txretransmitbytes += min(len, tp->t_maxseg);
- }
- }
- else
+ } else {
len = 0;
+ }
}
after_sack_rexmit:
/*
* Get standard flags, and add SYN or FIN if requested by 'hidden'
* state flags.
*/
- if (tp->t_flags & TF_NEEDFIN)
+ if (tp->t_flags & TF_NEEDFIN) {
flags |= TH_FIN;
- if (tp->t_flags & TF_NEEDSYN)
- flags |= TH_SYN;
+ }
/*
* If in persist timeout with window of 0, send 1 byte.
* and timer expired, we will send what we can
* and go to transmit state.
*/
- if (tp->t_force) {
+ if (tp->t_flagsext & TF_FORCE) {
if (sendwin == 0) {
/*
* If we still have some data to send, then
* to send then the probe will be the FIN
* itself.
*/
- if (off < so->so_snd.sb_cc)
+ if (off < so->so_snd.sb_cc) {
flags &= ~TH_FIN;
+ }
sendwin = 1;
} else {
tp->t_timer[TCPT_PERSIST] = 0;
- tp->t_rxtshift = 0;
- tp->rxt_start = 0;
tp->t_persist_stop = 0;
+ TCP_RESET_REXMT_STATE(tp);
}
}
* in which case len is already set.
*/
if (sack_rxmit == 0) {
- if (sack_bytes_rxmt == 0)
+ if (sack_bytes_rxmt == 0) {
len = min(so->so_snd.sb_cc, sendwin) - off;
- else {
+ } else {
int32_t cwin;
- /*
+ if (tcp_do_better_lr) {
+ cwin = tp->snd_cwnd - tcp_flight_size(tp);
+ } else {
+ cwin = tp->snd_cwnd -
+ (tp->snd_nxt - tp->sack_newdata) -
+ sack_bytes_rxmt;
+ }
+ if (cwin < 0) {
+ cwin = 0;
+ }
+ /*
* We are inside of a SACK recovery episode and are
* sending new data, having retransmitted all the
* data possible in the scoreboard.
*/
- len = min(so->so_snd.sb_cc, tp->snd_wnd)
- - off;
+ len = min(so->so_snd.sb_cc, tp->snd_wnd) - off;
/*
* Don't remove this (len > 0) check !
- * We explicitly check for len > 0 here (although it
- * isn't really necessary), to work around a gcc
+ * We explicitly check for len > 0 here (although it
+ * isn't really necessary), to work around a gcc
* optimization issue - to force gcc to compute
* len above. Without this check, the computation
* of len is bungled by the optimizer.
*/
if (len > 0) {
- cwin = tp->snd_cwnd -
- (tp->snd_nxt - tp->sack_newdata) -
- sack_bytes_rxmt;
- if (cwin < 0)
- cwin = 0;
len = imin(len, cwin);
- }
- else
+ } else {
len = 0;
+ }
+ /*
+ * At this point SACK recovery can not send any
+ * data from scoreboard or any new data. Check
+ * if we can do a rescue retransmit towards the
+ * tail end of recovery window.
+ */
+ if (len == 0 && cwin > 0 &&
+ SEQ_LT(tp->snd_fack, tp->snd_recover) &&
+ !(tp->t_flagsext & TF_RESCUE_RXT)) {
+ len = min((tp->snd_recover - tp->snd_fack),
+ tp->t_maxseg);
+ len = imin(len, cwin);
+ old_snd_nxt = tp->snd_nxt;
+ sack_rescue_rxt = TRUE;
+ tp->snd_nxt = tp->snd_recover - len;
+ /*
+ * If FIN has been sent, snd_max
+ * must have been advanced to cover it.
+ */
+ if ((tp->t_flags & TF_SENTFIN) &&
+ tp->snd_max == tp->snd_recover) {
+ tp->snd_nxt--;
+ }
+
+ off = tp->snd_nxt - tp->snd_una;
+ sendalot = 0;
+ tp->t_flagsext |= TF_RESCUE_RXT;
+ }
}
}
* know that foreign host supports TAO, suppress sending segment.
*/
if ((flags & TH_SYN) && SEQ_GT(tp->snd_nxt, tp->snd_una)) {
- flags &= ~TH_SYN;
- off--, len++;
- if (len > 0 && tp->t_state == TCPS_SYN_SENT) {
- while (!(tp->t_flags & TF_SENDINPROG) &&
- tp->t_pktlist_head != NULL) {
- packetlist = tp->t_pktlist_head;
- packchain_listadd = tp->t_lastchain;
- packchain_sent++;
- TCP_PKTLIST_CLEAR(tp);
- tp->t_flags |= TF_SENDINPROG;
-
- error = tcp_ip_output(so, tp, packetlist,
- packchain_listadd, tp_inp_options,
- (so_options & SO_DONTROUTE), (sack_rxmit | (sack_bytes_rxmt != 0)), 0);
-
- tp->t_flags &= ~TF_SENDINPROG;
- }
- /* tcp was closed while we were in ip; resume close */
- if ((tp->t_flags &
- (TF_CLOSING|TF_SENDINPROG)) == TF_CLOSING) {
- tp->t_flags &= ~TF_CLOSING;
- (void) tcp_close(tp);
- } else {
- tcp_check_timer_state(tp);
+ if (tp->t_state == TCPS_SYN_RECEIVED && tfo_enabled(tp) && tp->snd_nxt == tp->snd_una + 1) {
+ /* We are sending the SYN again! */
+ off--;
+ len++;
+ } else {
+ if (tp->t_state != TCPS_SYN_RECEIVED || tfo_enabled(tp)) {
+ flags &= ~TH_SYN;
+ }
+
+ off--;
+ len++;
+ if (len > 0 && tp->t_state == TCPS_SYN_SENT) {
+ while (inp->inp_sndinprog_cnt == 0 &&
+ tp->t_pktlist_head != NULL) {
+ packetlist = tp->t_pktlist_head;
+ packchain_listadd = tp->t_lastchain;
+ packchain_sent++;
+ TCP_PKTLIST_CLEAR(tp);
+
+ error = tcp_ip_output(so, tp, packetlist,
+ packchain_listadd, tp_inp_options,
+ (so_options & SO_DONTROUTE),
+ (sack_rxmit || (sack_bytes_rxmt != 0)),
+ isipv6);
+ }
+
+ /*
+ * tcp was closed while we were in ip,
+ * resume close
+ */
+ if (inp->inp_sndinprog_cnt == 0 &&
+ (tp->t_flags & TF_CLOSING)) {
+ tp->t_flags &= ~TF_CLOSING;
+ (void) tcp_close(tp);
+ } else {
+ tcp_check_timer_state(tp);
+ }
+ KERNEL_DEBUG(DBG_FNC_TCP_OUTPUT | DBG_FUNC_END,
+ 0, 0, 0, 0, 0);
+ return 0;
}
- KERNEL_DEBUG(DBG_FNC_TCP_OUTPUT | DBG_FUNC_END,
- 0,0,0,0,0);
- return 0;
}
}
* Be careful not to send data and/or FIN on SYN segments.
* This measure is needed to prevent interoperability problems
* with not fully conformant TCP implementations.
+ *
+ * In case of TFO, we handle the setting of the len in
+ * tcp_tfo_check. In case TFO is not enabled, never ever send
+ * SYN+data.
*/
- if ((flags & TH_SYN) && (tp->t_flags & TF_NOOPT)) {
+ if ((flags & TH_SYN) && !tfo_enabled(tp)) {
len = 0;
flags &= ~TH_FIN;
}
- /* The check here used to be (len < 0). Some times len is zero when
- * the congestion window is closed and we need to check if persist timer
- * has to be set in that case. But don't set persist until connection
- * is established.
- */
+ /*
+ * Don't send a RST with data.
+ */
+ if (flags & TH_RST) {
+ len = 0;
+ }
+
+ if ((flags & TH_SYN) && tp->t_state <= TCPS_SYN_SENT && tfo_enabled(tp)) {
+ len = tcp_tfo_check(tp, len);
+ }
+
+ /*
+ * The check here used to be (len < 0). Some times len is zero
+ * when the congestion window is closed and we need to check
+ * if persist timer has to be set in that case. But don't set
+ * persist until connection is established.
+ */
if (len <= 0 && !(flags & TH_SYN)) {
/*
* If FIN has been sent but not acked,
len = 0;
if (sendwin == 0) {
tp->t_timer[TCPT_REXMT] = 0;
- tp->t_rxtshift = 0;
- tp->rxt_start = 0;
+ tp->t_timer[TCPT_PTO] = 0;
+ TCP_RESET_REXMT_STATE(tp);
tp->snd_nxt = tp->snd_una;
- if (tp->t_timer[TCPT_PERSIST] == 0)
+ off = 0;
+ if (tp->t_timer[TCPT_PERSIST] == 0) {
tcp_setpersist(tp);
+ }
+ }
+ }
+
+ /*
+ * Automatic sizing of send socket buffer. Increase the send
+ * socket buffer size if all of the following criteria are met
+ * 1. the receiver has enough buffer space for this data
+ * 2. send buffer is filled to 7/8th with data (so we actually
+ * have data to make use of it);
+ * 3. our send window (slow start and congestion controlled) is
+ * larger than sent but unacknowledged data in send buffer.
+ */
+ if (!INP_WAIT_FOR_IF_FEEDBACK(inp) && !IN_FASTRECOVERY(tp) &&
+ (so->so_snd.sb_flags & (SB_AUTOSIZE | SB_TRIM)) == SB_AUTOSIZE &&
+ tcp_cansbgrow(&so->so_snd)) {
+ if ((tp->snd_wnd / 4 * 5) >= so->so_snd.sb_hiwat &&
+ so->so_snd.sb_cc >= (so->so_snd.sb_hiwat / 8 * 7) &&
+ sendwin >= (so->so_snd.sb_cc - (tp->snd_nxt - tp->snd_una))) {
+ if (sbreserve(&so->so_snd,
+ min(so->so_snd.sb_hiwat + tcp_autosndbuf_inc,
+ tcp_autosndbuf_max)) == 1) {
+ so->so_snd.sb_idealsize = so->so_snd.sb_hiwat;
+ }
}
}
* Offloading (if supported by hardware) and ensure that FIN is removed
* if the length no longer contains the last data byte.
*
- * TSO may only be used if we are in a pure bulk sending state. The
- * presence of TCP-MD5, SACK retransmits, SACK advertizements, ipfw rules
- * and IP options prevent using TSO. With TSO the TCP header is the same
+ * TSO may only be used if we are in a pure bulk sending state.
+ * The presence of TCP-MD5, SACK retransmits, SACK advertizements,
+ * filters and IP options, as well as disabling hardware checksum
+ * offload prevent using TSO. With TSO the TCP header is the same
* (except for the sequence number) for all generated packets. This
* makes it impossible to transmit any options which vary per generated
* segment or packet.
* Pre-calculate here as we save another lookup into the darknesses
* of IPsec that way and can actually decide if TSO is ok.
*/
- if (ipsec_bypass == 0)
- ipsec_optlen = ipsec_hdrsiz_tcp(tp);
+ if (ipsec_bypass == 0) {
+ ipsec_optlen = (unsigned int)ipsec_hdrsiz_tcp(tp);
+ }
#endif
-
if (len > tp->t_maxseg) {
- if ((tp->t_flags & TF_TSO) && tcp_do_tso &&
-#if RANDOM_IP_ID
- ip_use_randomid &&
-#endif /* RANDOM_IP_ID */
- kipf_count == 0 && dlil_filter_count == 0 &&
- tp->rcv_numsacks == 0 && sack_rxmit == 0 && sack_bytes_rxmt == 0 &&
- tp->t_inpcb->inp_options == NULL &&
- tp->t_inpcb->in6p_options == NULL
+ if ((tp->t_flags & TF_TSO) && tcp_do_tso && hwcksum_tx &&
+ ip_use_randomid && kipf_count == 0 &&
+ dlil_filter_disable_tso_count == 0 &&
+ tp->rcv_numsacks == 0 && sack_rxmit == 0 &&
+ sack_bytes_rxmt == 0 &&
+ inp->inp_options == NULL &&
+ inp->in6p_options == NULL
#if IPSEC
&& ipsec_optlen == 0
-#endif
-#if IPFIREWALL
- && (fw_enable == 0 || fw_bypass)
#endif
) {
tso = 1;
sendalot = 1;
tso = 0;
}
- }
- if (sack_rxmit) {
- if (SEQ_LT(p->rxmit + len, tp->snd_una + so->so_snd.sb_cc))
- flags &= ~TH_FIN;
} else {
- if (SEQ_LT(tp->snd_nxt + len, tp->snd_una + so->so_snd.sb_cc))
- flags &= ~TH_FIN;
+ tso = 0;
}
- recwin = tcp_sbspace(tp);
+ /* Send one segment or less as a tail loss probe */
+ if (tp->t_flagsext & TF_SENT_TLPROBE) {
+ len = min(len, tp->t_maxseg);
+ sendalot = 0;
+ tso = 0;
+ }
- /*
- * Sender silly window avoidance. We transmit under the following
- * conditions when len is non-zero:
- *
+#if MPTCP
+ if (so->so_flags & SOF_MP_SUBFLOW && off < 0) {
+ os_log_error(mptcp_log_handle, "%s - %lx: offset is negative! len %d off %d\n",
+ __func__, (unsigned long)VM_KERNEL_ADDRPERM(tp->t_mpsub->mpts_mpte),
+ len, off);
+ }
+
+ if ((so->so_flags & SOF_MP_SUBFLOW) &&
+ !(tp->t_mpflags & TMPF_TCP_FALLBACK)) {
+ int newlen = len;
+ if (tp->t_state >= TCPS_ESTABLISHED &&
+ (tp->t_mpflags & TMPF_SND_MPPRIO ||
+ tp->t_mpflags & TMPF_SND_REM_ADDR ||
+ tp->t_mpflags & TMPF_SND_MPFAIL ||
+ tp->t_mpflags & TMPF_SND_KEYS ||
+ tp->t_mpflags & TMPF_SND_JACK)) {
+ if (len > 0) {
+ len = 0;
+ tso = 0;
+ }
+ /*
+ * On a new subflow, don't try to send again, because
+ * we are still waiting for the fourth ack.
+ */
+ if (!(tp->t_mpflags & TMPF_PREESTABLISHED)) {
+ sendalot = 1;
+ }
+ mptcp_acknow = TRUE;
+ } else {
+ mptcp_acknow = FALSE;
+ }
+ /*
+ * The contiguous bytes in the subflow socket buffer can be
+ * discontiguous at the MPTCP level. Since only one DSS
+ * option can be sent in one packet, reduce length to match
+ * the contiguous MPTCP level. Set sendalot to send remainder.
+ */
+ if (len > 0 && off >= 0) {
+ newlen = mptcp_adj_sendlen(so, off);
+ }
+
+ if (newlen < len) {
+ len = newlen;
+ if (len <= tp->t_maxseg) {
+ tso = 0;
+ }
+ }
+ }
+#endif /* MPTCP */
+
+ if (sack_rxmit) {
+ if (SEQ_LT(p->rxmit + len, tp->snd_una + so->so_snd.sb_cc)) {
+ flags &= ~TH_FIN;
+ }
+ } else {
+ if (SEQ_LT(tp->snd_nxt + len, tp->snd_una + so->so_snd.sb_cc)) {
+ flags &= ~TH_FIN;
+ }
+ }
+ /*
+ * Compare available window to amount of window
+ * known to peer (as advertised window less
+ * next expected input). If the difference is at least two
+ * max size segments, or at least 25% of the maximum possible
+ * window, then want to send a window update to peer.
+ */
+ recwin = tcp_sbspace(tp);
+
+ if (!(so->so_flags & SOF_MP_SUBFLOW)) {
+ if (recwin < (int32_t)(so->so_rcv.sb_hiwat / 4) &&
+ recwin < (int)tp->t_maxseg) {
+ recwin = 0;
+ }
+ } else {
+ struct mptcb *mp_tp = tptomptp(tp);
+ struct socket *mp_so = mptetoso(mp_tp->mpt_mpte);
+
+ if (recwin < (int32_t)(mp_so->so_rcv.sb_hiwat / 4) &&
+ recwin < (int)tp->t_maxseg) {
+ recwin = 0;
+ }
+ }
+
+#if TRAFFIC_MGT
+ if (tcp_recv_bg == 1 || IS_TCP_RECV_BG(so)) {
+ if (recwin > 0 && tcp_recv_throttle(tp)) {
+ uint32_t min_iaj_win = tcp_min_iaj_win * tp->t_maxseg;
+ uint32_t bg_rwintop = tp->rcv_adv;
+ if (SEQ_LT(bg_rwintop, tp->rcv_nxt + min_iaj_win)) {
+ bg_rwintop = tp->rcv_nxt + min_iaj_win;
+ }
+ recwin = imin((int32_t)(bg_rwintop - tp->rcv_nxt),
+ recwin);
+ if (recwin < 0) {
+ recwin = 0;
+ }
+ }
+ }
+#endif /* TRAFFIC_MGT */
+
+ if (recwin > (int32_t)(TCP_MAXWIN << tp->rcv_scale)) {
+ recwin = (int32_t)(TCP_MAXWIN << tp->rcv_scale);
+ }
+
+ if (!(so->so_flags & SOF_MP_SUBFLOW)) {
+ if (recwin < (int32_t)(tp->rcv_adv - tp->rcv_nxt)) {
+ recwin = (int32_t)(tp->rcv_adv - tp->rcv_nxt);
+ }
+ } else {
+ struct mptcb *mp_tp = tptomptp(tp);
+ int64_t recwin_announced = (int64_t)(mp_tp->mpt_rcvadv - mp_tp->mpt_rcvnxt);
+
+ /* Don't remove what we announced at the MPTCP-layer */
+ VERIFY(recwin_announced < INT32_MAX && recwin_announced > INT32_MIN);
+ if (recwin < (int32_t)recwin_announced) {
+ recwin = (int32_t)recwin_announced;
+ }
+ }
+
+ /*
+ * Sender silly window avoidance. We transmit under the following
+ * conditions when len is non-zero:
+ *
+ * - we've timed out (e.g. persist timer)
+ * - we need to retransmit
* - We have a full segment (or more with TSO)
* - This is the last buffer in a write()/send() and we are
* either idle or running NODELAY
- * - we've timed out (e.g. persist timer)
* - we have more then 1/2 the maximum send window's worth of
* data (receiver may be limited the window size)
- * - we need to retransmit
*/
if (len) {
- if (len >= tp->t_maxseg) {
- tp->t_flags |= TF_MAXSEGSNT;
+ if (tp->t_flagsext & TF_FORCE) {
goto send;
}
- if (!(tp->t_flags & TF_MORETOCOME) &&
- (idle || tp->t_flags & TF_NODELAY || tp->t_flags & TF_MAXSEGSNT) &&
- (tp->t_flags & TF_NOPUSH) == 0 &&
- len + off >= so->so_snd.sb_cc) {
- tp->t_flags &= ~TF_MAXSEGSNT;
+ if (SEQ_LT(tp->snd_nxt, tp->snd_max)) {
goto send;
}
- if (tp->t_force) {
- tp->t_flags &= ~TF_MAXSEGSNT;
+ if (sack_rxmit) {
goto send;
}
- if (len >= tp->max_sndwnd / 2 && tp->max_sndwnd > 0) {
- tp->t_flags &= ~TF_MAXSEGSNT;
+
+ /*
+ * If this here is the first segment after SYN/ACK and TFO
+ * is being used, then we always send it, regardless of Nagle,...
+ */
+ if (tp->t_state == TCPS_SYN_RECEIVED &&
+ tfo_enabled(tp) &&
+ (tp->t_tfo_flags & TFO_F_COOKIE_VALID) &&
+ tp->snd_nxt == tp->iss + 1) {
goto send;
}
- if (SEQ_LT(tp->snd_nxt, tp->snd_max)) {
- tp->t_flags &= ~TF_MAXSEGSNT;
- goto send;
+
+ /*
+ * Send new data on the connection only if it is
+ * not flow controlled
+ */
+ if (!INP_WAIT_FOR_IF_FEEDBACK(inp) ||
+ tp->t_state != TCPS_ESTABLISHED) {
+ if (len >= tp->t_maxseg) {
+ goto send;
+ }
+
+ if (!(tp->t_flags & TF_MORETOCOME) &&
+ (idle || tp->t_flags & TF_NODELAY ||
+ (tp->t_flags & TF_MAXSEGSNT) ||
+ ALLOW_LIMITED_TRANSMIT(tp)) &&
+ (tp->t_flags & TF_NOPUSH) == 0 &&
+ (len + off >= so->so_snd.sb_cc ||
+ /*
+ * MPTCP needs to respect the DSS-mappings. So, it
+ * may be sending data that *could* have been
+ * coalesced, but cannot because of
+ * mptcp_adj_sendlen().
+ */
+ so->so_flags & SOF_MP_SUBFLOW)) {
+ goto send;
+ }
+ if (len >= tp->max_sndwnd / 2 && tp->max_sndwnd > 0) {
+ goto send;
+ }
+ } else {
+ tcpstat.tcps_fcholdpacket++;
}
- if (sack_rxmit)
- goto send;
}
- /*
- * Compare available window to amount of window
- * known to peer (as advertised window less
- * next expected input). If the difference is at least two
- * max size segments, or at least 50% of the maximum possible
- * window, then want to send a window update to peer.
- * Skip this if the connection is in T/TCP half-open state.
- */
- if (recwin > 0 && !(tp->t_flags & TF_NEEDSYN)) {
+ if (recwin > 0) {
/*
* "adv" is the amount we can increase the window,
* taking into account that we are limited by
* TCP_MAXWIN << tp->rcv_scale.
*/
- int32_t adv = imin(recwin, (int)TCP_MAXWIN << tp->rcv_scale) -
- (tp->rcv_adv - tp->rcv_nxt);
-
- if (adv >= (int32_t) (2 * tp->t_maxseg)) {
-
- /*
- * Update only if the resulting scaled value of the window changed, or
- * if there is a change in the sequence since the last ack.
- * This avoids what appears as dupe ACKS (see rdar://5640997)
- */
+ int32_t adv, oldwin = 0;
+ adv = imin(recwin, (int)TCP_MAXWIN << tp->rcv_scale) -
+ (tp->rcv_adv - tp->rcv_nxt);
- if ((tp->last_ack_sent != tp->rcv_nxt) || (((recwin + adv) >> tp->rcv_scale) > recwin))
- goto send;
+ if (SEQ_GT(tp->rcv_adv, tp->rcv_nxt)) {
+ oldwin = tp->rcv_adv - tp->rcv_nxt;
+ }
+
+ if (tcp_ack_strategy == TCP_ACK_STRATEGY_LEGACY) {
+ if (adv >= (int32_t) (2 * tp->t_maxseg)) {
+ /*
+ * Update only if the resulting scaled value of
+ * the window changed, or if there is a change in
+ * the sequence since the last ack. This avoids
+ * what appears as dupe ACKS (see rdar://5640997)
+ *
+ * If streaming is detected avoid sending too many
+ * window updates. We will depend on the delack
+ * timer to send a window update when needed.
+ *
+ * If there is more data to read, don't send an ACK.
+ * Otherwise we will end up sending many ACKs if the
+ * application is doing micro-reads.
+ */
+ if (!(tp->t_flags & TF_STRETCHACK) &&
+ (tp->last_ack_sent != tp->rcv_nxt ||
+ ((oldwin + adv) >> tp->rcv_scale) >
+ (oldwin >> tp->rcv_scale))) {
+ goto send;
+ }
+ }
+ } else {
+ if (adv >= (int32_t) (2 * tp->t_maxseg)) {
+ /*
+ * ACK every second full-sized segment, if the
+ * ACK is advancing or the window becomes bigger
+ */
+ if (so->so_rcv.sb_cc < so->so_rcv.sb_lowat &&
+ (tp->last_ack_sent != tp->rcv_nxt ||
+ ((oldwin + adv) >> tp->rcv_scale) >
+ (oldwin >> tp->rcv_scale))) {
+ goto send;
+ }
+ } else if (tp->t_flags & TF_DELACK) {
+ /*
+ * If we delayed the ACK and the window
+ * is not advancing by a lot (< 2MSS), ACK
+ * immediately if the last incoming packet had
+ * the push flag set and we emptied the buffer.
+ *
+ * This takes care of a sender doing small
+ * repeated writes with Nagle enabled.
+ */
+ if (so->so_rcv.sb_cc == 0 &&
+ tp->last_ack_sent != tp->rcv_nxt &&
+ (tp->t_flagsext & TF_LAST_IS_PSH)) {
+ goto send;
+ }
+ }
+ }
+ if (4 * adv >= (int32_t) so->so_rcv.sb_hiwat) {
+ goto send;
+ }
+
+ /*
+ * Make sure that the delayed ack timer is set if
+ * we delayed sending a window update because of
+ * streaming detection.
+ */
+ if (tcp_ack_strategy == TCP_ACK_STRATEGY_LEGACY &&
+ (tp->t_flags & TF_STRETCHACK) &&
+ !(tp->t_flags & TF_DELACK)) {
+ tp->t_flags |= TF_DELACK;
+ tp->t_timer[TCPT_DELACK] =
+ OFFSET_FROM_START(tp, tcp_delack);
}
- if (2 * adv >= (int32_t) so->so_rcv.sb_hiwat)
- goto send;
}
/*
- * Send if we owe the peer an ACK, RST, SYN, or urgent data. ACKNOW
+ * Send if we owe the peer an ACK, RST, SYN, or urgent data. ACKNOW
* is also a catch-all for the retransmit timer timeout case.
*/
- if (tp->t_flags & TF_ACKNOW)
+ if (tp->t_flags & TF_ACKNOW) {
+ if (tp->t_forced_acks > 0) {
+ tp->t_forced_acks--;
+ }
goto send;
- if ((flags & TH_RST) ||
- ((flags & TH_SYN) && (tp->t_flags & TF_NEEDSYN) == 0))
+ }
+ if ((flags & TH_RST) || (flags & TH_SYN)) {
goto send;
- if (SEQ_GT(tp->snd_up, tp->snd_una))
+ }
+ if (SEQ_GT(tp->snd_up, tp->snd_una)) {
goto send;
+ }
+#if MPTCP
+ if (mptcp_acknow) {
+ goto send;
+ }
+#endif /* MPTCP */
/*
* If our state indicates that FIN should be sent
* and we have not yet done so, then we need to send.
*/
- if (flags & TH_FIN &&
- ((tp->t_flags & TF_SENTFIN) == 0 || tp->snd_nxt == tp->snd_una))
+ if ((flags & TH_FIN) &&
+ (!(tp->t_flags & TF_SENTFIN) || tp->snd_nxt == tp->snd_una)) {
goto send;
+ }
/*
* In SACK, it is possible for tcp_output to fail to send a segment
* after the retransmission timer has been turned off. Make sure
* that the retransmission timer is set.
*/
- if (tp->sack_enable && (tp->t_state >= TCPS_ESTABLISHED) && SEQ_GT(tp->snd_max, tp->snd_una) &&
- tp->t_timer[TCPT_REXMT] == 0 &&
+ if (SACK_ENABLED(tp) && (tp->t_state >= TCPS_ESTABLISHED) &&
+ SEQ_GT(tp->snd_max, tp->snd_una) &&
+ tp->t_timer[TCPT_REXMT] == 0 &&
tp->t_timer[TCPT_PERSIST] == 0) {
- tp->t_timer[TCPT_REXMT] = OFFSET_FROM_START(tp, tp->t_rxtcur);
- goto just_return;
- }
+ tp->t_timer[TCPT_REXMT] = OFFSET_FROM_START(tp,
+ tp->t_rxtcur);
+ goto just_return;
+ }
/*
* TCP window updates are not reliable, rather a polling protocol
* using ``persist'' packets is used to insure receipt of window
*/
if (so->so_snd.sb_cc && tp->t_timer[TCPT_REXMT] == 0 &&
tp->t_timer[TCPT_PERSIST] == 0) {
- tp->t_rxtshift = 0;
- tp->rxt_start = 0;
+ TCP_RESET_REXMT_STATE(tp);
tcp_setpersist(tp);
}
just_return:
* If there is no reason to send a segment, just return.
* but if there is some packets left in the packet list, send them now.
*/
- while (!(tp->t_flags & TF_SENDINPROG) && tp->t_pktlist_head != NULL) {
+ while (inp->inp_sndinprog_cnt == 0 &&
+ tp->t_pktlist_head != NULL) {
packetlist = tp->t_pktlist_head;
packchain_listadd = tp->t_lastchain;
packchain_sent++;
TCP_PKTLIST_CLEAR(tp);
- tp->t_flags |= TF_SENDINPROG;
-
- error = tcp_ip_output(so, tp, packetlist, packchain_listadd,
- tp_inp_options, (so_options & SO_DONTROUTE), (sack_rxmit | (sack_bytes_rxmt != 0)), recwin);
- tp->t_flags &= ~TF_SENDINPROG;
+ error = tcp_ip_output(so, tp, packetlist,
+ packchain_listadd,
+ tp_inp_options, (so_options & SO_DONTROUTE),
+ (sack_rxmit || (sack_bytes_rxmt != 0)), isipv6);
}
/* tcp was closed while we were in ip; resume close */
- if ((tp->t_flags & (TF_CLOSING|TF_SENDINPROG)) == TF_CLOSING) {
+ if (inp->inp_sndinprog_cnt == 0 &&
+ (tp->t_flags & TF_CLOSING)) {
tp->t_flags &= ~TF_CLOSING;
(void) tcp_close(tp);
} else {
tcp_check_timer_state(tp);
}
- KERNEL_DEBUG(DBG_FNC_TCP_OUTPUT | DBG_FUNC_END, 0,0,0,0,0);
- return (0);
+ KERNEL_DEBUG(DBG_FNC_TCP_OUTPUT | DBG_FUNC_END, 0, 0, 0, 0, 0);
+ return 0;
send:
+ /*
+ * Set TF_MAXSEGSNT flag if the segment size is greater than
+ * the max segment size.
+ */
+ if (len > 0) {
+ do_not_compress = TRUE;
+
+ if (len >= tp->t_maxseg) {
+ tp->t_flags |= TF_MAXSEGSNT;
+ } else {
+ tp->t_flags &= ~TF_MAXSEGSNT;
+ }
+ }
/*
* Before ESTABLISHED, force sending of initial options
* unless TCP set not to do any options.
* max_linkhdr + sizeof (struct tcpiphdr) + optlen <= MCLBYTES
*/
optlen = 0;
-#if INET6
- if (isipv6)
- hdrlen = sizeof (struct ip6_hdr) + sizeof (struct tcphdr);
- else
-#endif
- hdrlen = sizeof (struct tcpiphdr);
+ if (isipv6) {
+ hdrlen = sizeof(struct ip6_hdr) + sizeof(struct tcphdr);
+ } else {
+ hdrlen = sizeof(struct tcpiphdr);
+ }
if (flags & TH_SYN) {
tp->snd_nxt = tp->iss;
if ((tp->t_flags & TF_NOOPT) == 0) {
if ((tp->t_flags & TF_REQ_SCALE) &&
((flags & TH_ACK) == 0 ||
(tp->t_flags & TF_RCVD_SCALE))) {
- *((u_int32_t *)(opt + optlen)) = htonl(
+ *((u_int32_t *)(void *)(opt + optlen)) = htonl(
TCPOPT_NOP << 24 |
- TCPOPT_WINDOW << 16 |
- TCPOLEN_WINDOW << 8 |
- tp->request_r_scale);
+ TCPOPT_WINDOW << 16 |
+ TCPOLEN_WINDOW << 8 |
+ tp->request_r_scale);
optlen += 4;
}
- }
-
- }
-
- /*
- RFC 3168 states that:
- - If you ever sent an ECN-setup SYN/SYN-ACK you must be prepared
- to handle the TCP ECE flag, even if you also later send a
- non-ECN-setup SYN/SYN-ACK.
- - If you ever send a non-ECN-setup SYN/SYN-ACK, you must not set
- the ip ECT flag.
-
- It is not clear how the ECE flag would ever be set if you never
- set the IP ECT flag on outbound packets. All the same, we use
- the TE_SETUPSENT to indicate that we have committed to handling
- the TCP ECE flag correctly. We use the TE_SENDIPECT to indicate
- whether or not we should set the IP ECT flag on outbound packets.
- */
- /*
- * For a SYN-ACK, send an ECN setup SYN-ACK
- */
- if (tcp_ecn_inbound && (flags & (TH_SYN | TH_ACK)) == (TH_SYN | TH_ACK)) {
- if ((tp->ecn_flags & TE_SETUPRECEIVED) != 0) {
- if ((tp->ecn_flags & TE_SETUPSENT) == 0) {
- /* Setting TH_ECE makes this an ECN-setup SYN-ACK */
- flags |= TH_ECE;
-
- /*
- * Record that we sent the ECN-setup and default to
- * setting IP ECT.
- */
- tp->ecn_flags |= (TE_SETUPSENT | TE_SENDIPECT);
- }
- else {
- /*
- * We sent an ECN-setup SYN-ACK but it was dropped.
- * Fallback to non-ECN-setup SYN-ACK and clear flag
- * that to indicate we should not send data with IP ECT set.
- *
- * Pretend we didn't receive an ECN-setup SYN.
- */
- tp->ecn_flags &= ~TE_SETUPRECEIVED;
+#if MPTCP
+ if (mptcp_enable && (so->so_flags & SOF_MP_SUBFLOW)) {
+ optlen = mptcp_setup_syn_opts(so, opt, optlen);
}
+#endif /* MPTCP */
}
}
- else if (tcp_ecn_outbound && (flags & (TH_SYN | TH_ACK)) == TH_SYN) {
- if ((tp->ecn_flags & TE_SETUPSENT) == 0) {
- /* Setting TH_ECE and TH_CWR makes this an ECN-setup SYN */
- flags |= (TH_ECE | TH_CWR);
-
- /*
- * Record that we sent the ECN-setup and default to
- * setting IP ECT.
- */
- tp->ecn_flags |= (TE_SETUPSENT | TE_SENDIPECT);
- }
- else {
- /*
- * We sent an ECN-setup SYN but it was dropped.
- * Fall back to no ECN and clear flag indicating
- * we should send data with IP ECT set.
- */
- tp->ecn_flags &= ~TE_SENDIPECT;
- }
- }
-
- /*
- * Check if we should set the TCP CWR flag.
- * CWR flag is sent when we reduced the congestion window because
- * we received a TCP ECE or we performed a fast retransmit. We
- * never set the CWR flag on retransmitted packets. We only set
- * the CWR flag on data packets. Pure acks don't have this set.
- */
- if ((tp->ecn_flags & TE_SENDCWR) != 0 && len != 0 &&
- !SEQ_LT(tp->snd_nxt, tp->snd_max)) {
- flags |= TH_CWR;
- tp->ecn_flags &= ~TE_SENDCWR;
- }
-
- /*
- * Check if we should set the TCP ECE flag.
- */
- if ((tp->ecn_flags & TE_SENDECE) != 0 && len == 0) {
- flags |= TH_ECE;
- }
- /*
+ /*
* Send a timestamp and echo-reply if this is a SYN and our side
* wants to use timestamps (TF_REQ_TSTMP is set) or both our side
* and our peer have sent timestamps in our SYN's.
- */
- if ((tp->t_flags & (TF_REQ_TSTMP|TF_NOOPT)) == TF_REQ_TSTMP &&
- (flags & TH_RST) == 0 &&
+ */
+ if ((tp->t_flags & (TF_REQ_TSTMP | TF_NOOPT)) == TF_REQ_TSTMP &&
+ (flags & TH_RST) == 0 &&
((flags & TH_ACK) == 0 ||
- (tp->t_flags & TF_RCVD_TSTMP))) {
- u_int32_t *lp = (u_int32_t *)(opt + optlen);
-
- /* Form timestamp option as shown in appendix A of RFC 1323. */
- *lp++ = htonl(TCPOPT_TSTAMP_HDR);
- *lp++ = htonl(tcp_now);
- *lp = htonl(tp->ts_recent);
- optlen += TCPOLEN_TSTAMP_APPA;
- }
-
- if (tp->sack_enable && ((tp->t_flags & TF_NOOPT) == 0)) {
- /*
+ (tp->t_flags & TF_RCVD_TSTMP))) {
+ u_int32_t *lp = (u_int32_t *)(void *)(opt + optlen);
+
+ /* Form timestamp option as shown in appendix A of RFC 1323. */
+ *lp++ = htonl(TCPOPT_TSTAMP_HDR);
+ *lp++ = htonl(tcp_now + tp->t_ts_offset);
+ *lp = htonl(tp->ts_recent);
+ optlen += TCPOLEN_TSTAMP_APPA;
+ }
+
+ if (SACK_ENABLED(tp) && ((tp->t_flags & TF_NOOPT) == 0)) {
+ /*
* Tack on the SACK permitted option *last*.
* And do padding of options after tacking this on.
* This is because of MSS, TS, WinScale and Signatures are
*bp++ = TCPOLEN_SACK_PERMITTED;
optlen += TCPOLEN_SACK_PERMITTED;
}
+ }
+#if MPTCP
+ if (so->so_flags & SOF_MP_SUBFLOW) {
+ /*
+ * Its important to piggyback acks with data as ack only packets
+ * may get lost and data packets that don't send Data ACKs
+ * still advance the subflow level ACK and therefore make it
+ * hard for the remote end to recover in low cwnd situations.
+ */
+ if (len != 0) {
+ tp->t_mpflags |= (TMPF_SEND_DSN |
+ TMPF_MPTCP_ACKNOW);
+ } else {
+ tp->t_mpflags |= TMPF_MPTCP_ACKNOW;
+ }
+ optlen = mptcp_setup_opts(tp, off, &opt[0], optlen, flags,
+ len, &mptcp_acknow, &do_not_compress);
+ tp->t_mpflags &= ~TMPF_SEND_DSN;
+ }
+#endif /* MPTCP */
+
+ if (tfo_enabled(tp) && !(tp->t_flags & TF_NOOPT) &&
+ (flags & (TH_SYN | TH_ACK)) == TH_SYN) {
+ optlen += tcp_tfo_write_cookie(tp, optlen, len, opt);
+ }
+
+ if (tfo_enabled(tp) &&
+ (flags & (TH_SYN | TH_ACK)) == (TH_SYN | TH_ACK) &&
+ (tp->t_tfo_flags & TFO_F_OFFER_COOKIE)) {
+ optlen += tcp_tfo_write_cookie_rep(tp, optlen, opt);
+ }
+ if (SACK_ENABLED(tp) && ((tp->t_flags & TF_NOOPT) == 0)) {
/*
* Send SACKs if necessary. This should be the last
* option processed. Only as many SACKs are sent as
* 10 bytes for SACK options 40 - (12 + 18).
*/
if (TCPS_HAVEESTABLISHED(tp->t_state) &&
- (tp->t_flags & TF_SACK_PERMIT) && tp->rcv_numsacks > 0 &&
+ (tp->t_flags & TF_SACK_PERMIT) &&
+ (tp->rcv_numsacks > 0 || TCP_SEND_DSACK_OPT(tp)) &&
MAX_TCPOPTLEN - optlen - 2 >= TCPOLEN_SACK) {
- int nsack, sackoptlen, padlen;
+ int nsack, padlen;
u_char *bp = (u_char *)opt + optlen;
u_int32_t *lp;
nsack = (MAX_TCPOPTLEN - optlen - 2) / TCPOLEN_SACK;
- nsack = min(nsack, tp->rcv_numsacks);
+ nsack = min(nsack, (tp->rcv_numsacks +
+ (TCP_SEND_DSACK_OPT(tp) ? 1 : 0)));
sackoptlen = (2 + nsack * TCPOLEN_SACK);
+ VERIFY(sackoptlen < UINT8_MAX);
/*
* First we need to pad options so that the
*/
padlen = (MAX_TCPOPTLEN - optlen - sackoptlen) % 4;
optlen += padlen;
- while (padlen-- > 0)
+ while (padlen-- > 0) {
*bp++ = TCPOPT_NOP;
+ }
tcpstat.tcps_sack_send_blocks++;
*bp++ = TCPOPT_SACK;
- *bp++ = sackoptlen;
- lp = (u_int32_t *)bp;
+ *bp++ = (uint8_t)sackoptlen;
+ lp = (u_int32_t *)(void *)bp;
+
+ /*
+ * First block of SACK option should represent
+ * DSACK. Prefer to send SACK information if there
+ * is space for only one SACK block. This will
+ * allow for faster recovery.
+ */
+ if (TCP_SEND_DSACK_OPT(tp) && nsack > 0 &&
+ (tp->rcv_numsacks == 0 || nsack > 1)) {
+ *lp++ = htonl(tp->t_dsack_lseq);
+ *lp++ = htonl(tp->t_dsack_rseq);
+ tcpstat.tcps_dsack_sent++;
+ tp->t_dsack_sent++;
+ nsack--;
+ }
+ VERIFY(nsack == 0 || tp->rcv_numsacks >= nsack);
for (i = 0; i < nsack; i++) {
struct sackblk sack = tp->sackblks[i];
*lp++ = htonl(sack.start);
}
}
+ /*
+ * RFC 3168 states that:
+ * - If you ever sent an ECN-setup SYN/SYN-ACK you must be prepared
+ * to handle the TCP ECE flag, even if you also later send a
+ * non-ECN-setup SYN/SYN-ACK.
+ * - If you ever send a non-ECN-setup SYN/SYN-ACK, you must not set
+ * the ip ECT flag.
+ *
+ * It is not clear how the ECE flag would ever be set if you never
+ * set the IP ECT flag on outbound packets. All the same, we use
+ * the TE_SETUPSENT to indicate that we have committed to handling
+ * the TCP ECE flag correctly. We use the TE_SENDIPECT to indicate
+ * whether or not we should set the IP ECT flag on outbound packet
+ *
+ * For a SYN-ACK, send an ECN setup SYN-ACK
+ */
+ if ((flags & (TH_SYN | TH_ACK)) == (TH_SYN | TH_ACK) &&
+ (tp->ecn_flags & TE_ENABLE_ECN)) {
+ if (tp->ecn_flags & TE_SETUPRECEIVED) {
+ if (tcp_send_ecn_flags_on_syn(tp)) {
+ /*
+ * Setting TH_ECE makes this an ECN-setup
+ * SYN-ACK
+ */
+ flags |= TH_ECE;
+
+ /*
+ * Record that we sent the ECN-setup and
+ * default to setting IP ECT.
+ */
+ tp->ecn_flags |= (TE_SETUPSENT | TE_SENDIPECT);
+ tcpstat.tcps_ecn_server_setup++;
+ tcpstat.tcps_ecn_server_success++;
+ } else {
+ /*
+ * We sent an ECN-setup SYN-ACK but it was
+ * dropped. Fallback to non-ECN-setup
+ * SYN-ACK and clear flag to indicate that
+ * we should not send data with IP ECT set
+ *
+ * Pretend we didn't receive an
+ * ECN-setup SYN.
+ *
+ * We already incremented the counter
+ * assuming that the ECN setup will
+ * succeed. Decrementing here
+ * tcps_ecn_server_success to correct it.
+ */
+ if (tp->ecn_flags & TE_SETUPSENT) {
+ tcpstat.tcps_ecn_lost_synack++;
+ tcpstat.tcps_ecn_server_success--;
+ tp->ecn_flags |= TE_LOST_SYNACK;
+ }
+
+ tp->ecn_flags &=
+ ~(TE_SETUPRECEIVED | TE_SENDIPECT |
+ TE_SENDCWR);
+ }
+ }
+ } else if ((flags & (TH_SYN | TH_ACK)) == TH_SYN &&
+ (tp->ecn_flags & TE_ENABLE_ECN)) {
+ if (tcp_send_ecn_flags_on_syn(tp)) {
+ /*
+ * Setting TH_ECE and TH_CWR makes this an
+ * ECN-setup SYN
+ */
+ flags |= (TH_ECE | TH_CWR);
+ tcpstat.tcps_ecn_client_setup++;
+ tp->ecn_flags |= TE_CLIENT_SETUP;
+
+ /*
+ * Record that we sent the ECN-setup and default to
+ * setting IP ECT.
+ */
+ tp->ecn_flags |= (TE_SETUPSENT | TE_SENDIPECT);
+ } else {
+ /*
+ * We sent an ECN-setup SYN but it was dropped.
+ * Fall back to non-ECN and clear flag indicating
+ * we should send data with IP ECT set.
+ */
+ if (tp->ecn_flags & TE_SETUPSENT) {
+ tcpstat.tcps_ecn_lost_syn++;
+ tp->ecn_flags |= TE_LOST_SYN;
+ }
+ tp->ecn_flags &= ~TE_SENDIPECT;
+ }
+ }
+
+ /*
+ * Check if we should set the TCP CWR flag.
+ * CWR flag is sent when we reduced the congestion window because
+ * we received a TCP ECE or we performed a fast retransmit. We
+ * never set the CWR flag on retransmitted packets. We only set
+ * the CWR flag on data packets. Pure acks don't have this set.
+ */
+ if ((tp->ecn_flags & TE_SENDCWR) != 0 && len != 0 &&
+ !SEQ_LT(tp->snd_nxt, tp->snd_max) && !sack_rxmit) {
+ flags |= TH_CWR;
+ tp->ecn_flags &= ~TE_SENDCWR;
+ }
+
+ /*
+ * Check if we should set the TCP ECE flag.
+ */
+ if ((tp->ecn_flags & TE_SENDECE) != 0 && len == 0) {
+ flags |= TH_ECE;
+ tcpstat.tcps_ecn_sent_ece++;
+ }
+
+
hdrlen += optlen;
-#if INET6
- if (isipv6)
- ipoptlen = ip6_optlen(tp->t_inpcb);
- else
-#endif
- {
+ /* Reset DSACK sequence numbers */
+ tp->t_dsack_lseq = 0;
+ tp->t_dsack_rseq = 0;
+
+ if (isipv6) {
+ ipoptlen = ip6_optlen(inp);
+ } else {
if (tp_inp_options) {
ipoptlen = tp_inp_options->m_len -
- offsetof(struct ipoption, ipopt_list);
- } else
+ offsetof(struct ipoption, ipopt_list);
+ } else {
ipoptlen = 0;
+ }
}
#if IPSEC
- ipoptlen += ipsec_optlen;
+ ipoptlen += ipsec_optlen;
#endif
/*
*/
if (len + optlen + ipoptlen > tp->t_maxopd) {
/*
- * If there is still more to send, don't close the connection.
+ * If there is still more to send,
+ * don't close the connection.
*/
flags &= ~TH_FIN;
if (tso) {
int32_t tso_maxlen;
- tso_maxlen = tp->tso_max_segment_size ? tp->tso_max_segment_size : TCP_MAXWIN;
+ tso_maxlen = tp->tso_max_segment_size ?
+ tp->tso_max_segment_size : TCP_MAXWIN;
if (len > tso_maxlen - hdrlen - optlen) {
len = tso_maxlen - hdrlen - optlen;
- len = len - (len % (tp->t_maxopd - optlen));
sendalot = 1;
- } else if (tp->t_flags & TF_NEEDFIN)
+ } else if (tp->t_flags & TF_NEEDFIN) {
sendalot = 1;
+ }
+
+ if (len % (tp->t_maxopd - optlen) != 0) {
+ len = len - (len % (tp->t_maxopd - optlen));
+ sendalot = 1;
+ }
} else {
len = tp->t_maxopd - optlen - ipoptlen;
sendalot = 1;
}
}
-/*#ifdef DIAGNOSTIC*/
-#if INET6
- if (max_linkhdr + hdrlen > MCLBYTES)
+ if (max_linkhdr + hdrlen > MCLBYTES) {
panic("tcphdr too big");
-#else
- if (max_linkhdr + hdrlen > MHLEN)
- panic("tcphdr too big");
-#endif
-/*#endif*/
+ }
+ /* Check if there is enough data in the send socket
+ * buffer to start measuring bandwidth
+ */
+ if ((tp->t_flagsext & TF_MEASURESNDBW) != 0 &&
+ (tp->t_bwmeas != NULL) &&
+ (tp->t_flagsext & TF_BWMEAS_INPROGRESS) == 0) {
+ tp->t_bwmeas->bw_size = min(min(
+ (so->so_snd.sb_cc - (tp->snd_max - tp->snd_una)),
+ tp->snd_cwnd), tp->snd_wnd);
+ if (tp->t_bwmeas->bw_minsize > 0 &&
+ tp->t_bwmeas->bw_size < tp->t_bwmeas->bw_minsize) {
+ tp->t_bwmeas->bw_size = 0;
+ }
+ if (tp->t_bwmeas->bw_maxsize > 0) {
+ tp->t_bwmeas->bw_size = min(tp->t_bwmeas->bw_size,
+ tp->t_bwmeas->bw_maxsize);
+ }
+ if (tp->t_bwmeas->bw_size > 0) {
+ tp->t_flagsext |= TF_BWMEAS_INPROGRESS;
+ tp->t_bwmeas->bw_start = tp->snd_max;
+ tp->t_bwmeas->bw_ts = tcp_now;
+ }
+ }
+
+ VERIFY(inp->inp_flowhash != 0);
/*
* Grab a header mbuf, attaching a copy of data to
* be transmitted, and initialize the header from
* the template for sends on this connection.
*/
if (len) {
- if (tp->t_force && len == 1)
+ /* Remember what the last head-of-line packet-size was */
+ if (tp->t_pmtud_lastseg_size == 0 && tp->snd_nxt == tp->snd_una) {
+ ASSERT(len + optlen + ipoptlen <= IP_MAXPACKET);
+ tp->t_pmtud_lastseg_size = (uint16_t)(len + optlen + ipoptlen);
+ }
+ if ((tp->t_flagsext & TF_FORCE) && len == 1) {
tcpstat.tcps_sndprobe++;
- else if (SEQ_LT(tp->snd_nxt, tp->snd_max) || sack_rxmit) {
+ } else if (SEQ_LT(tp->snd_nxt, tp->snd_max) || sack_rxmit) {
tcpstat.tcps_sndrexmitpack++;
tcpstat.tcps_sndrexmitbyte += len;
if (nstat_collect) {
- nstat_route_tx(tp->t_inpcb->inp_route.ro_rt, 1, len, NSTAT_TX_FLAG_RETRANSMIT);
- locked_add_64(&tp->t_inpcb->inp_stat->txpackets, 1);
- locked_add_64(&tp->t_inpcb->inp_stat->txbytes, len);
+ nstat_route_tx(inp->inp_route.ro_rt, 1,
+ len, NSTAT_TX_FLAG_RETRANSMIT);
+ INP_ADD_STAT(inp, cell, wifi, wired,
+ txpackets, 1);
+ INP_ADD_STAT(inp, cell, wifi, wired,
+ txbytes, len);
tp->t_stat.txretransmitbytes += len;
+ tp->t_stat.rxmitpkts++;
}
} else {
tcpstat.tcps_sndpack++;
tcpstat.tcps_sndbyte += len;
+
if (nstat_collect) {
- locked_add_64(&tp->t_inpcb->inp_stat->txpackets, 1);
- locked_add_64(&tp->t_inpcb->inp_stat->txbytes, len);
+ INP_ADD_STAT(inp, cell, wifi, wired,
+ txpackets, 1);
+ INP_ADD_STAT(inp, cell, wifi, wired,
+ txbytes, len);
}
+ inp_decr_sndbytes_unsent(so, len);
}
-#ifdef notyet
- if ((m = m_copypack(so->so_snd.sb_mb, off,
- (int)len, max_linkhdr + hdrlen)) == 0) {
- error = ENOBUFS;
- goto out;
+ inp_set_activity_bitmap(inp);
+#if MPTCP
+ if (tp->t_mpflags & TMPF_MPTCP_TRUE) {
+ tcpstat.tcps_mp_sndpacks++;
+ tcpstat.tcps_mp_sndbytes += len;
}
+#endif /* MPTCP */
/*
- * m_copypack left space for our hdr; use it.
- */
- m->m_len += hdrlen;
- m->m_data -= hdrlen;
-#else
- /*
- * try to use the new interface that allocates all
- * the necessary mbuf hdrs under 1 mbuf lock and
- * avoids rescanning the socket mbuf list if
+ * try to use the new interface that allocates all
+ * the necessary mbuf hdrs under 1 mbuf lock and
+ * avoids rescanning the socket mbuf list if
* certain conditions are met. This routine can't
* be used in the following cases...
* 1) the protocol headers exceed the capacity of
* data area (no cluster attached)
*/
m = NULL;
-#if INET6
- if (MHLEN < hdrlen + max_linkhdr) {
- MGETHDR(m, M_DONTWAIT, MT_HEADER); /* MAC-OK */
+
+ /* minimum length we are going to allocate */
+ allocated_len = MHLEN;
+ if (MHLEN < hdrlen + max_linkhdr) {
+ MGETHDR(m, M_DONTWAIT, MT_HEADER);
if (m == NULL) {
- error = ENOBUFS;
+ error = ENOBUFS;
+ goto out;
+ }
+ MCLGET(m, M_DONTWAIT);
+ if ((m->m_flags & M_EXT) == 0) {
+ m_freem(m);
+ error = ENOBUFS;
goto out;
}
- MCLGET(m, M_DONTWAIT);
- if ((m->m_flags & M_EXT) == 0) {
- m_freem(m);
- error = ENOBUFS;
- goto out;
- }
m->m_data += max_linkhdr;
m->m_len = hdrlen;
+ allocated_len = MCLBYTES;
}
-#endif
- if (len <= MHLEN - hdrlen - max_linkhdr) {
- if (m == NULL) {
- MGETHDR(m, M_DONTWAIT, MT_HEADER); /* MAC-OK */
+ if (len <= allocated_len - hdrlen - max_linkhdr) {
+ if (m == NULL) {
+ VERIFY(allocated_len <= MHLEN);
+ MGETHDR(m, M_DONTWAIT, MT_HEADER);
if (m == NULL) {
- error = ENOBUFS;
+ error = ENOBUFS;
goto out;
}
m->m_data += max_linkhdr;
}
/* makes sure we still have data left to be sent at this point */
if (so->so_snd.sb_mb == NULL || off < 0) {
- if (m != NULL) m_freem(m);
+ if (m != NULL) {
+ m_freem(m);
+ }
error = 0; /* should we return an error? */
goto out;
}
mtod(m, caddr_t) + hdrlen);
m->m_len += len;
} else {
- if (m != NULL) {
- m->m_next = m_copy(so->so_snd.sb_mb, off, (int) len);
- if (m->m_next == 0) {
- (void) m_free(m);
+ uint32_t copymode;
+ /*
+ * Retain packet header metadata at the socket
+ * buffer if this is is an MPTCP subflow,
+ * otherwise move it.
+ */
+ copymode = M_COPYM_MOVE_HDR;
+#if MPTCP
+ if (so->so_flags & SOF_MP_SUBFLOW) {
+ copymode = M_COPYM_NOOP_HDR;
+ }
+#endif /* MPTCP */
+ if (m != NULL) {
+ m->m_next = m_copym_mode(so->so_snd.sb_mb,
+ off, (int)len, M_DONTWAIT, copymode);
+ if (m->m_next == NULL) {
+ (void) m_free(m);
error = ENOBUFS;
goto out;
}
} else {
- /*
- * determine whether the mbuf pointer and offset passed back by the 'last' call
- * to m_copym_with_hdrs are still valid... if the head of the socket chain has
- * changed (due to an incoming ACK for instance), or the offset into the chain we
- * just computed is different from the one last returned by m_copym_with_hdrs (perhaps
- * we're re-transmitting a packet sent earlier), than we can't pass the mbuf pointer and
- * offset into it as valid hints for m_copym_with_hdrs to use (if valid, these hints allow
- * m_copym_with_hdrs to avoid rescanning from the beginning of the socket buffer mbuf list.
- * setting the mbuf pointer to NULL is sufficient to disable the hint mechanism.
+ /*
+ * make sure we still have data left
+ * to be sent at this point
*/
- if (m_head != so->so_snd.sb_mb || sack_rxmit || last_off != off)
- m_lastm = NULL;
- last_off = off + len;
- m_head = so->so_snd.sb_mb;
-
- /* makes sure we still have data left to be sent at this point */
- if (m_head == NULL) {
+ if (so->so_snd.sb_mb == NULL) {
error = 0; /* should we return an error? */
goto out;
}
-
+
/*
- * m_copym_with_hdrs will always return the last mbuf pointer and the offset into it that
- * it acted on to fullfill the current request, whether a valid 'hint' was passed in or not
+ * m_copym_with_hdrs will always return the
+ * last mbuf pointer and the offset into it that
+ * it acted on to fullfill the current request,
+ * whether a valid 'hint' was passed in or not.
*/
- if ((m = m_copym_with_hdrs(so->so_snd.sb_mb, off, len, M_DONTWAIT, &m_lastm, &m_off)) == NULL) {
- error = ENOBUFS;
+ if ((m = m_copym_with_hdrs(so->so_snd.sb_mb,
+ off, len, M_DONTWAIT, NULL, NULL,
+ copymode)) == NULL) {
+ error = ENOBUFS;
goto out;
}
m->m_data += max_linkhdr;
m->m_len = hdrlen;
}
}
-#endif
/*
* If we're sending everything we've got, set PUSH.
* (This will keep happy those implementations which only
* give data to the user when a buffer fills or
* a PUSH comes in.)
+ *
+ * On SYN-segments we should not add the PUSH-flag.
*/
- if (off + len == so->so_snd.sb_cc)
+ if (off + len == so->so_snd.sb_cc && !(flags & TH_SYN)) {
flags |= TH_PUSH;
+ }
} else {
- if (tp->t_flags & TF_ACKNOW)
+ if (tp->t_flags & TF_ACKNOW) {
tcpstat.tcps_sndacks++;
- else if (flags & (TH_SYN|TH_FIN|TH_RST))
+ } else if (flags & (TH_SYN | TH_FIN | TH_RST)) {
tcpstat.tcps_sndctrl++;
- else if (SEQ_GT(tp->snd_up, tp->snd_una))
+ } else if (SEQ_GT(tp->snd_up, tp->snd_una)) {
tcpstat.tcps_sndurg++;
- else
+ } else {
tcpstat.tcps_sndwinup++;
+ }
- MGETHDR(m, M_DONTWAIT, MT_HEADER); /* MAC-OK */
+ MGETHDR(m, M_DONTWAIT, MT_HEADER); /* MAC-OK */
if (m == NULL) {
error = ENOBUFS;
goto out;
}
-#if INET6
- if (isipv6 && (MHLEN < hdrlen + max_linkhdr) &&
- MHLEN >= hdrlen) {
- MH_ALIGN(m, hdrlen);
- } else
-#endif
+ if (MHLEN < (hdrlen + max_linkhdr)) {
+ MCLGET(m, M_DONTWAIT);
+ if ((m->m_flags & M_EXT) == 0) {
+ m_freem(m);
+ error = ENOBUFS;
+ goto out;
+ }
+ }
m->m_data += max_linkhdr;
m->m_len = hdrlen;
}
- m->m_pkthdr.rcvif = 0;
-#if CONFIG_MACF_NET
- mac_mbuf_label_associate_inpcb(tp->t_inpcb, m);
-#endif
-#if INET6
+ m->m_pkthdr.rcvif = 0;
+
+ /* Any flag other than pure-ACK: Do not compress! */
+ if (flags & ~(TH_ACK)) {
+ do_not_compress = TRUE;
+ }
+
+ if (tp->rcv_scale == 0) {
+ do_not_compress = TRUE;
+ }
+
+ if (do_not_compress || (tcp_do_ack_compression == 1 && !cell) || __improbable(!tcp_do_ack_compression)) {
+ m->m_pkthdr.comp_gencnt = 0;
+ } else {
+ if (TSTMP_LT(tp->t_comp_lastinc + tcp_ack_compression_rate, tcp_now)) {
+ tp->t_comp_gencnt++;
+ /* 0 means no compression, thus jump this */
+ if (tp->t_comp_gencnt <= TCP_ACK_COMPRESSION_DUMMY) {
+ tp->t_comp_gencnt = TCP_ACK_COMPRESSION_DUMMY + 1;
+ }
+ tp->t_comp_lastinc = tcp_now;
+ }
+ m->m_pkthdr.comp_gencnt = tp->t_comp_gencnt;
+ }
+
if (isipv6) {
ip6 = mtod(m, struct ip6_hdr *);
- th = (struct tcphdr *)(ip6 + 1);
+ th = (struct tcphdr *)(void *)(ip6 + 1);
tcp_fillheaders(tp, ip6, th);
if ((tp->ecn_flags & TE_SENDIPECT) != 0 && len &&
- !SEQ_LT(tp->snd_nxt, tp->snd_max)) {
+ !SEQ_LT(tp->snd_nxt, tp->snd_max) && !sack_rxmit) {
ip6->ip6_flow |= htonl(IPTOS_ECN_ECT0 << 20);
}
- } else
-#endif /* INET6 */
- {
+ svc_flags |= PKT_SCF_IPV6;
+#if PF_ECN
+ m_pftag(m)->pftag_hdr = (void *)ip6;
+ m_pftag(m)->pftag_flags |= PF_TAG_HDR_INET6;
+#endif /* PF_ECN */
+ } else {
ip = mtod(m, struct ip *);
- ipov = (struct ipovly *)ip;
- th = (struct tcphdr *)(ip + 1);
+ th = (struct tcphdr *)(void *)(ip + 1);
/* this picks up the pseudo header (w/o the length) */
tcp_fillheaders(tp, ip, th);
if ((tp->ecn_flags & TE_SENDIPECT) != 0 && len &&
- !SEQ_LT(tp->snd_nxt, tp->snd_max)) {
- ip->ip_tos = IPTOS_ECN_ECT0;
+ !SEQ_LT(tp->snd_nxt, tp->snd_max) &&
+ !sack_rxmit && !(flags & TH_SYN)) {
+ ip->ip_tos |= IPTOS_ECN_ECT0;
}
+#if PF_ECN
+ m_pftag(m)->pftag_hdr = (void *)ip;
+ m_pftag(m)->pftag_flags |= PF_TAG_HDR_INET;
+#endif /* PF_ECN */
}
/*
* window for use in delaying messages about window sizes.
* If resending a FIN, be sure not to use a new sequence number.
*/
- if (flags & TH_FIN && tp->t_flags & TF_SENTFIN &&
- tp->snd_nxt == tp->snd_max)
+ if ((flags & TH_FIN) && (tp->t_flags & TF_SENTFIN) &&
+ tp->snd_nxt == tp->snd_max) {
tp->snd_nxt--;
+ }
/*
* If we are doing retransmissions, then snd_nxt will
* not reflect the first unsent octet. For ACK only
* right edge of the window, so use snd_nxt in that
* case, since we know we aren't doing a retransmission.
* (retransmit and persist are mutually exclusive...)
+ *
+ * Note the state of this retransmit segment to detect spurious
+ * retransmissions.
*/
if (sack_rxmit == 0) {
- if (len || (flags & (TH_SYN|TH_FIN)) || tp->t_timer[TCPT_PERSIST])
+ if (len || (flags & (TH_SYN | TH_FIN)) ||
+ tp->t_timer[TCPT_PERSIST]) {
th->th_seq = htonl(tp->snd_nxt);
- else
+ if (len > 0) {
+ m->m_pkthdr.tx_start_seq = tp->snd_nxt;
+ m->m_pkthdr.pkt_flags |= PKTF_START_SEQ;
+ }
+ if (SEQ_LT(tp->snd_nxt, tp->snd_max)) {
+ if (SACK_ENABLED(tp) && len > 1) {
+ tcp_rxtseg_insert(tp, tp->snd_nxt,
+ (tp->snd_nxt + len - 1));
+ }
+ if (len > 0) {
+ m->m_pkthdr.pkt_flags |=
+ PKTF_TCP_REXMT;
+ }
+ }
+ } else {
th->th_seq = htonl(tp->snd_max);
+ }
} else {
th->th_seq = htonl(p->rxmit);
+ if (len > 0) {
+ m->m_pkthdr.pkt_flags |=
+ (PKTF_TCP_REXMT | PKTF_START_SEQ);
+ m->m_pkthdr.tx_start_seq = p->rxmit;
+ }
+ tcp_rxtseg_insert(tp, p->rxmit, (p->rxmit + len - 1));
p->rxmit += len;
tp->sackhint.sack_bytes_rexmit += len;
}
th->th_ack = htonl(tp->rcv_nxt);
tp->last_ack_sent = tp->rcv_nxt;
-
if (optlen) {
bcopy(opt, th + 1, optlen);
- th->th_off = (sizeof (struct tcphdr) + optlen) >> 2;
+ th->th_off = (sizeof(struct tcphdr) + optlen) >> 2;
}
th->th_flags = flags;
- /*
- * Calculate receive window. Don't shrink window,
- * but avoid silly window syndrome.
- */
- if (recwin < (int32_t)(so->so_rcv.sb_hiwat / 4) && recwin < (int)tp->t_maxseg)
- recwin = 0;
- if (recwin < (int32_t)(tp->rcv_adv - tp->rcv_nxt))
- recwin = (int32_t)(tp->rcv_adv - tp->rcv_nxt);
- if (tp->t_flags & TF_SLOWLINK && slowlink_wsize > 0) {
- if (recwin > (int32_t)slowlink_wsize)
- recwin = slowlink_wsize;
- }
+ th->th_win = htons((u_short) (recwin >> tp->rcv_scale));
+ tp->t_last_recwin = recwin;
+ if (!(so->so_flags & SOF_MP_SUBFLOW)) {
+ if (recwin > 0 && SEQ_LT(tp->rcv_adv, tp->rcv_nxt + recwin)) {
+ tp->rcv_adv = tp->rcv_nxt + recwin;
+ }
+ } else {
+ struct mptcb *mp_tp = tptomptp(tp);
+ if (recwin > 0) {
+ tp->rcv_adv = tp->rcv_nxt + recwin;
+ }
-#if TRAFFIC_MGT
- if (tcp_recv_bg == 1 || is_tcp_recv_bg(so)) {
- if (tp->acc_iaj > tcp_acc_iaj_react_limit) {
- uint32_t min_iaj_win = tcp_min_iaj_win * tp->t_maxseg;
- if (tp->iaj_rwintop == 0 ||
- SEQ_LT(tp->iaj_rwintop, tp->rcv_adv))
- tp->iaj_rwintop = tp->rcv_adv;
- if (SEQ_LT(tp->iaj_rwintop, tp->rcv_nxt + min_iaj_win))
- tp->iaj_rwintop = tp->rcv_nxt + min_iaj_win;
- recwin = min(tp->iaj_rwintop - tp->rcv_nxt, recwin);
+ if (recwin > 0 && MPTCP_SEQ_LT(mp_tp->mpt_rcvadv, mp_tp->mpt_rcvnxt + recwin)) {
+ mp_tp->mpt_rcvadv = mp_tp->mpt_rcvnxt + recwin;
}
}
-#endif /* TRAFFIC_MGT */
-
- if (recwin > (int32_t)(TCP_MAXWIN << tp->rcv_scale))
- recwin = (int32_t)(TCP_MAXWIN << tp->rcv_scale);
- th->th_win = htons((u_short) (recwin>>tp->rcv_scale));
/*
* Adjust the RXWIN0SENT flag - indicate that we have advertised
* to read more data then can be buffered prior to transmitting on
* the connection.
*/
- if (th->th_win == 0)
+ if (th->th_win == 0) {
tp->t_flags |= TF_RXWIN0SENT;
- else
+ } else {
tp->t_flags &= ~TF_RXWIN0SENT;
+ }
+
if (SEQ_GT(tp->snd_up, tp->snd_nxt)) {
th->th_urp = htons((u_short)(tp->snd_up - tp->snd_nxt));
th->th_flags |= TH_URG;
- } else
+ } else {
/*
* If no urgent pointer to send, then we pull
* the urgent pointer to the left edge of the send window
* so that it doesn't drift into the send window on sequence
* number wraparound.
*/
- tp->snd_up = tp->snd_una; /* drag it along */
+ tp->snd_up = tp->snd_una; /* drag it along */
+ }
/*
* Put TCP length in extended header, and then
* checksum extended header and data.
*/
m->m_pkthdr.len = hdrlen + len; /* in6_cksum() need this */
-#if INET6
+
+ /*
+ * If this is potentially the last packet on the stream, then mark
+ * it in order to enable some optimizations in the underlying
+ * layers
+ */
+ if (tp->t_state != TCPS_ESTABLISHED &&
+ (tp->t_state == TCPS_CLOSING || tp->t_state == TCPS_TIME_WAIT
+ || tp->t_state == TCPS_LAST_ACK || (th->th_flags & TH_RST))) {
+ m->m_pkthdr.pkt_flags |= PKTF_LAST_PKT;
+ }
+
if (isipv6) {
/*
* ip6_plen is not need to be filled now, and will be filled
*/
m->m_pkthdr.csum_flags = CSUM_TCPIPV6;
m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum);
- if (len + optlen)
- th->th_sum = in_addword(th->th_sum,
- htons((u_short)(optlen + len)));
- }
- else
-#endif /* INET6 */
- {
+ if (len + optlen) {
+ th->th_sum = in_addword(th->th_sum,
+ htons((u_short)(optlen + len)));
+ }
+ } else {
m->m_pkthdr.csum_flags = CSUM_TCP;
m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum);
- if (len + optlen)
- th->th_sum = in_addword(th->th_sum,
- htons((u_short)(optlen + len)));
+ if (len + optlen) {
+ th->th_sum = in_addword(th->th_sum,
+ htons((u_short)(optlen + len)));
+ }
}
/*
* The TCP pseudo header checksum is always provided.
*/
if (tso) {
-#if INET6
- if (isipv6)
- m->m_pkthdr.csum_flags = CSUM_TSO_IPV6;
- else
-#endif /* INET6 */
- m->m_pkthdr.csum_flags = CSUM_TSO_IPV4;
+ if (isipv6) {
+ m->m_pkthdr.csum_flags |= CSUM_TSO_IPV6;
+ } else {
+ m->m_pkthdr.csum_flags |= CSUM_TSO_IPV4;
+ }
m->m_pkthdr.tso_segsz = tp->t_maxopd - optlen;
- }
- else
+ } else {
m->m_pkthdr.tso_segsz = 0;
+ }
/*
* In transmit state, time the transmission and arrange for
* the retransmit. In persist state, just set snd_max.
*/
- if (tp->t_force == 0 || tp->t_timer[TCPT_PERSIST] == 0) {
+ if (!(tp->t_flagsext & TF_FORCE)
+ || tp->t_timer[TCPT_PERSIST] == 0) {
tcp_seq startseq = tp->snd_nxt;
/*
* Advance snd_nxt over sequence space of this segment.
*/
- if (flags & (TH_SYN|TH_FIN)) {
- if (flags & TH_SYN)
+ if (flags & (TH_SYN | TH_FIN)) {
+ if (flags & TH_SYN) {
tp->snd_nxt++;
- if (flags & TH_FIN) {
+ }
+ if ((flags & TH_FIN) &&
+ !(tp->t_flags & TF_SENTFIN)) {
tp->snd_nxt++;
tp->t_flags |= TF_SENTFIN;
}
}
- if (sack_rxmit)
+ if (sack_rxmit) {
goto timer;
- tp->snd_nxt += len;
+ }
+ if (sack_rescue_rxt == TRUE) {
+ tp->snd_nxt = old_snd_nxt;
+ sack_rescue_rxt = FALSE;
+ tcpstat.tcps_pto_in_recovery++;
+ } else {
+ tp->snd_nxt += len;
+ }
if (SEQ_GT(tp->snd_nxt, tp->snd_max)) {
tp->snd_max = tp->snd_nxt;
+ tp->t_sndtime = tcp_now;
/*
* Time this transmission if not a retransmission and
* not currently timing anything.
tp->t_rtttime = tcp_now;
tp->t_rtseq = startseq;
tcpstat.tcps_segstimed++;
+
+ /* update variables related to pipe ack */
+ tp->t_pipeack_lastuna = tp->snd_una;
}
}
/*
* Set retransmit timer if not currently set,
* and not doing an ack or a keep-alive probe.
- * Initial value for retransmit timer is smoothed
- * round-trip time + 2 * round-trip time variance.
- * Initialize shift counter which is used for backoff
- * of retransmit time.
*/
timer:
if (tp->t_timer[TCPT_REXMT] == 0 &&
((sack_rxmit && tp->snd_nxt != tp->snd_max) ||
- tp->snd_nxt != tp->snd_una)) {
+ tp->snd_nxt != tp->snd_una || (flags & TH_FIN))) {
if (tp->t_timer[TCPT_PERSIST]) {
tp->t_timer[TCPT_PERSIST] = 0;
- tp->t_rxtshift = 0;
- tp->rxt_start = 0;
tp->t_persist_stop = 0;
+ TCP_RESET_REXMT_STATE(tp);
+ }
+ tp->t_timer[TCPT_REXMT] =
+ OFFSET_FROM_START(tp, tp->t_rxtcur);
+ }
+
+ /*
+ * Set tail loss probe timeout if new data is being
+ * transmitted. This will be supported only when
+ * SACK option is enabled on a connection.
+ *
+ * Every time new data is sent PTO will get reset.
+ */
+ if (tcp_enable_tlp && len != 0 && tp->t_state == TCPS_ESTABLISHED &&
+ SACK_ENABLED(tp) && !IN_FASTRECOVERY(tp) &&
+ tp->snd_nxt == tp->snd_max &&
+ SEQ_GT(tp->snd_nxt, tp->snd_una) &&
+ tp->t_rxtshift == 0 &&
+ (tp->t_flagsext & (TF_SENT_TLPROBE | TF_PKTS_REORDERED)) == 0) {
+ uint32_t pto, srtt;
+
+ if (tcp_do_better_lr) {
+ srtt = tp->t_srtt >> TCP_RTT_SHIFT;
+ pto = 2 * srtt;
+ if ((tp->snd_max - tp->snd_una) <= tp->t_maxseg) {
+ pto += tcp_delack;
+ } else {
+ pto += 2;
+ }
+ } else {
+ /*
+ * Using SRTT alone to set PTO can cause spurious
+ * retransmissions on wireless networks where there
+ * is a lot of variance in RTT. Taking variance
+ * into account will avoid this.
+ */
+ srtt = tp->t_srtt >> TCP_RTT_SHIFT;
+ pto = ((TCP_REXMTVAL(tp)) * 3) >> 1;
+ pto = max(2 * srtt, pto);
+ if ((tp->snd_max - tp->snd_una) == tp->t_maxseg) {
+ pto = max(pto,
+ (((3 * pto) >> 2) + tcp_delack * 2));
+ } else {
+ pto = max(10, pto);
+ }
+ }
+
+ /* if RTO is less than PTO, choose RTO instead */
+ if (tp->t_rxtcur < pto) {
+ pto = tp->t_rxtcur;
}
- tp->t_timer[TCPT_REXMT] = OFFSET_FROM_START(tp, tp->t_rxtcur);
+
+ tp->t_timer[TCPT_PTO] = OFFSET_FROM_START(tp, pto);
}
} else {
/*
* persist mode (no window) we do not update snd_nxt.
*/
int xlen = len;
- if (flags & TH_SYN)
+ if (flags & TH_SYN) {
++xlen;
- if (flags & TH_FIN) {
+ }
+ if ((flags & TH_FIN) &&
+ !(tp->t_flags & TF_SENTFIN)) {
++xlen;
tp->t_flags |= TF_SENTFIN;
}
- if (SEQ_GT(tp->snd_nxt + xlen, tp->snd_max))
+ if (SEQ_GT(tp->snd_nxt + xlen, tp->snd_max)) {
tp->snd_max = tp->snd_nxt + len;
+ tp->t_sndtime = tcp_now;
+ }
}
#if TCPDEBUG
/*
* Trace.
*/
- if (so_options & SO_DEBUG)
+ if (so_options & SO_DEBUG) {
tcp_trace(TA_OUTPUT, tp->t_state, tp, mtod(m, void *), th, 0);
+ }
#endif
/*
* m->m_pkthdr.len should have been set before cksum calcuration,
* because in6_cksum() need it.
*/
-#if INET6
if (isipv6) {
- struct rtentry *rt6;
- struct ip6_out_args ip6oa = { IFSCOPE_NONE, 0 };
- unsigned int outif;
-
- KERNEL_DEBUG(DBG_LAYER_BEG,
- ((tp->t_inpcb->inp_fport << 16) | tp->t_inpcb->inp_lport),
- (((tp->t_inpcb->in6p_laddr.s6_addr16[0] & 0xffff) << 16) |
- (tp->t_inpcb->in6p_faddr.s6_addr16[0] & 0xffff)),
- 0,0,0);
/*
* we separately set hoplimit for every segment, since the
* user might want to change the value via setsockopt.
* Also, desired default hop limit might be changed via
* Neighbor Discovery.
*/
- ip6->ip6_hlim = in6_selecthlim(tp->t_inpcb,
- tp->t_inpcb->in6p_route.ro_rt ?
- tp->t_inpcb->in6p_route.ro_rt->rt_ifp
- : NULL);
+ ip6->ip6_hlim = in6_selecthlim(inp, inp->in6p_route.ro_rt ?
+ inp->in6p_route.ro_rt->rt_ifp : NULL);
/* TODO: IPv6 IP6TOS_ECT bit on */
-#if IPSEC
- if (ipsec_bypass == 0 && ipsec_setsocket(m, so) != 0) {
- m_freem(m);
- error = ENOBUFS;
- goto out;
- }
-#endif /*IPSEC*/
- m->m_pkthdr.socket_id = socket_id;
-
- rt6 = tp->t_inpcb->in6p_route.ro_rt;
- if (rt6 != NULL && rt6->rt_ifp != NULL
- && rt6->rt_ifp != lo_ifp)
- set_packet_tclass(m, so, MBUF_TC_UNSPEC, 1);
-
- DTRACE_TCP5(send, struct mbuf *, m, struct inpcb *, tp->t_inpcb, struct ip6_hdr *, ip6,
- struct tcpcb *, tp, struct tcphdr *, th);
-
- if (tp->t_inpcb->inp_flags & INP_BOUND_IF)
- ip6oa.ip6oa_boundif = tp->t_inpcb->inp_boundif;
-
- ip6oa.ip6oa_nocell = (tp->t_inpcb->inp_flags & INP_NO_IFT_CELLULAR) ? 1 : 0;
-
- error = ip6_output(m, inp6_pktopts, &tp->t_inpcb->in6p_route,
- (so_options & SO_DONTROUTE) | IPV6_OUTARGS, NULL, NULL,
- &ip6oa);
-
- /* Refresh rt6 as we may have lost the route while in ip6_output() */
- if ((rt6 = tp->t_inpcb->in6p_route.ro_rt) != NULL &&
- (outif = rt6->rt_ifp->if_index) != tp->t_inpcb->in6p_last_outif)
- tp->t_inpcb->in6p_last_outif = outif;
- } else
-#endif /* INET6 */
- {
- ip->ip_len = m->m_pkthdr.len;
- ip->ip_ttl = tp->t_inpcb->inp_ip_ttl; /* XXX */
- ip->ip_tos |= (tp->t_inpcb->inp_ip_tos & ~IPTOS_ECN_MASK); /* XXX */
-
-
- KERNEL_DEBUG(DBG_LAYER_BEG,
- ((tp->t_inpcb->inp_fport << 16) | tp->t_inpcb->inp_lport),
- (((tp->t_inpcb->inp_laddr.s_addr & 0xffff) << 16) |
- (tp->t_inpcb->inp_faddr.s_addr & 0xffff)),
- 0,0,0);
+ KERNEL_DEBUG(DBG_LAYER_BEG,
+ ((inp->inp_fport << 16) | inp->inp_lport),
+ (((inp->in6p_laddr.s6_addr16[0] & 0xffff) << 16) |
+ (inp->in6p_faddr.s6_addr16[0] & 0xffff)),
+ sendalot, 0, 0);
+ } else {
+ ASSERT(m->m_pkthdr.len <= IP_MAXPACKET);
+ ip->ip_len = (u_short)m->m_pkthdr.len;
+ ip->ip_ttl = inp->inp_ip_ttl; /* XXX */
+ ip->ip_tos |= (inp->inp_ip_tos & ~IPTOS_ECN_MASK);/* XXX */
+ KERNEL_DEBUG(DBG_LAYER_BEG,
+ ((inp->inp_fport << 16) | inp->inp_lport),
+ (((inp->inp_laddr.s_addr & 0xffff) << 16) |
+ (inp->inp_faddr.s_addr & 0xffff)), 0, 0, 0);
+ }
/*
* See if we should do MTU discovery.
* 4) the MTU is not locked (if it is, then discovery has been
* disabled for that route)
*/
+ if (!isipv6) {
+ if (path_mtu_discovery && (tp->t_flags & TF_PMTUD)) {
+ ip->ip_off |= IP_DF;
+ }
+ }
+
+#if NECP
+ {
+ necp_kernel_policy_id policy_id;
+ necp_kernel_policy_id skip_policy_id;
+ u_int32_t route_rule_id;
+ u_int32_t pass_flags;
+ if (!necp_socket_is_allowed_to_send_recv(inp, NULL, 0, &policy_id, &route_rule_id, &skip_policy_id, &pass_flags)) {
+ TCP_LOG_DROP_NECP(isipv6 ? (void *)ip6 : (void *)ip, th, tp, true);
+ m_freem(m);
+ error = EHOSTUNREACH;
+ goto out;
+ }
+ necp_mark_packet_from_socket(m, inp, policy_id, route_rule_id, skip_policy_id, pass_flags);
- if (path_mtu_discovery && (tp->t_flags & TF_PMTUD))
- ip->ip_off |= IP_DF;
+ if (net_qos_policy_restricted != 0) {
+ necp_socket_update_qos_marking(inp, inp->inp_route.ro_rt, route_rule_id);
+ }
+ }
+#endif /* NECP */
#if IPSEC
- if (ipsec_bypass == 0)
- ipsec_setsocket(m, so);
+ if (inp->inp_sp != NULL) {
+ ipsec_setsocket(m, so);
+ }
#endif /*IPSEC*/
/*
* The socket is kept locked while sending out packets in ip_output, even if packet chaining is not active.
*/
lost = 0;
- m->m_pkthdr.socket_id = socket_id;
+
+ /*
+ * Embed the flow hash in pkt hdr and mark the packet as
+ * capable of flow controlling
+ */
+ m->m_pkthdr.pkt_flowsrc = FLOWSRC_INPCB;
+ m->m_pkthdr.pkt_flowid = inp->inp_flowhash;
+ m->m_pkthdr.pkt_flags |= (PKTF_FLOW_ID | PKTF_FLOW_LOCALSRC | PKTF_FLOW_ADV);
+ m->m_pkthdr.pkt_proto = IPPROTO_TCP;
+ m->m_pkthdr.tx_tcp_pid = so->last_pid;
+ if (so->so_flags & SOF_DELEGATED) {
+ m->m_pkthdr.tx_tcp_e_pid = so->e_pid;
+ } else {
+ m->m_pkthdr.tx_tcp_e_pid = 0;
+ }
+
m->m_nextpkt = NULL;
- if (tp->t_inpcb->inp_route.ro_rt != NULL &&
- tp->t_inpcb->inp_route.ro_rt->rt_ifp != NULL &&
- tp->t_inpcb->inp_route.ro_rt->rt_ifp != lo_ifp)
- set_packet_tclass(m, so, MBUF_TC_UNSPEC, 0);
+ if (inp->inp_last_outifp != NULL &&
+ !(inp->inp_last_outifp->if_flags & IFF_LOOPBACK)) {
+ /* Hint to prioritize this packet if
+ * 1. if the packet has no data
+ * 2. the interface supports transmit-start model and did
+ * not disable ACK prioritization.
+ * 3. Only ACK flag is set.
+ * 4. there is no outstanding data on this connection.
+ */
+ if (len == 0 && (inp->inp_last_outifp->if_eflags & (IFEF_TXSTART | IFEF_NOACKPRI)) == IFEF_TXSTART) {
+ if (th->th_flags == TH_ACK &&
+ tp->snd_una == tp->snd_max &&
+ tp->t_timer[TCPT_REXMT] == 0) {
+ svc_flags |= PKT_SCF_TCP_ACK;
+ }
+ if (th->th_flags & TH_SYN) {
+ svc_flags |= PKT_SCF_TCP_SYN;
+ }
+ }
+ set_packet_service_class(m, so, sotc, svc_flags);
+ } else {
+ /*
+ * Optimization for loopback just set the mbuf
+ * service class
+ */
+ (void) m_set_service_class(m, so_tc2msc(sotc));
+ }
+
+ TCP_LOG_TH_FLAGS(isipv6 ? (void *)ip6 : (void *)ip, th, tp, true,
+ inp->inp_last_outifp != NULL ? inp->inp_last_outifp :
+ inp->inp_boundifp);
tp->t_pktlist_sentlen += len;
tp->t_lastchain++;
- DTRACE_TCP5(send, struct mbuf *, m, struct inpcb *, tp->t_inpcb,
- struct ip *, ip, struct tcpcb *, tp, struct tcphdr *, th);
+ if (isipv6) {
+ DTRACE_TCP5(send, struct mbuf *, m, struct inpcb *, inp,
+ struct ip6 *, ip6, struct tcpcb *, tp, struct tcphdr *,
+ th);
+ } else {
+ DTRACE_TCP5(send, struct mbuf *, m, struct inpcb *, inp,
+ struct ip *, ip, struct tcpcb *, tp, struct tcphdr *, th);
+ }
if (tp->t_pktlist_head != NULL) {
tp->t_pktlist_tail->m_nextpkt = m;
}
if (sendalot == 0 || (tp->t_state != TCPS_ESTABLISHED) ||
- (tp->snd_cwnd <= (tp->snd_wnd / 8)) ||
- (tp->t_flags & (TH_PUSH | TF_ACKNOW)) || tp->t_force != 0 ||
- tp->t_lastchain >= tcp_packet_chaining) {
+ (tp->snd_cwnd <= (tp->snd_wnd / 8)) ||
+ (tp->t_flags & TF_ACKNOW) ||
+ (tp->t_flagsext & TF_FORCE) ||
+ tp->t_lastchain >= tcp_packet_chaining) {
error = 0;
- while (!(tp->t_flags & TF_SENDINPROG) &&
+ while (inp->inp_sndinprog_cnt == 0 &&
tp->t_pktlist_head != NULL) {
packetlist = tp->t_pktlist_head;
packchain_listadd = tp->t_lastchain;
packchain_sent++;
lost = tp->t_pktlist_sentlen;
TCP_PKTLIST_CLEAR(tp);
- tp->t_flags |= TF_SENDINPROG;
error = tcp_ip_output(so, tp, packetlist,
packchain_listadd, tp_inp_options,
- (so_options & SO_DONTROUTE), (sack_rxmit | (sack_bytes_rxmt != 0)), recwin);
-
- tp->t_flags &= ~TF_SENDINPROG;
+ (so_options & SO_DONTROUTE),
+ (sack_rxmit || (sack_bytes_rxmt != 0)), isipv6);
if (error) {
/*
* Take into account the rest of unsent
}
}
/* tcp was closed while we were in ip; resume close */
- if ((tp->t_flags & (TF_CLOSING|TF_SENDINPROG)) == TF_CLOSING) {
+ if (inp->inp_sndinprog_cnt == 0 &&
+ (tp->t_flags & TF_CLOSING)) {
tp->t_flags &= ~TF_CLOSING;
(void) tcp_close(tp);
- return (0);
+ return 0;
}
- }
- else {
+ } else {
error = 0;
packchain_looped++;
tcpstat.tcps_sndtotal++;
goto again;
}
- }
if (error) {
/*
* Assume that the packets were lost, so back out the
* the recent call to ip_output_list() plus the amount of
* user data in the packet list for this tcp at the moment.
*/
- if (tp->t_force == 0 || tp->t_timer[TCPT_PERSIST] == 0) {
+ if (!(tp->t_flagsext & TF_FORCE)
+ || tp->t_timer[TCPT_PERSIST] == 0) {
/*
* No need to check for TH_FIN here because
* the TF_SENTFIN flag handles that case.
*/
if ((flags & TH_SYN) == 0) {
if (sack_rxmit) {
- p->rxmit -= lost;
+ if (SEQ_GT((p->rxmit - lost),
+ tp->snd_una)) {
+ p->rxmit -= lost;
+
+ if (SEQ_LT(p->rxmit, p->start)) {
+ p->rxmit = p->start;
+ }
+ } else {
+ lost = p->rxmit - tp->snd_una;
+ p->rxmit = tp->snd_una;
+
+ if (SEQ_LT(p->rxmit, p->start)) {
+ p->rxmit = p->start;
+ }
+ }
tp->sackhint.sack_bytes_rexmit -= lost;
- } else
- tp->snd_nxt -= lost;
+ if (tp->sackhint.sack_bytes_rexmit < 0) {
+ tp->sackhint.sack_bytes_rexmit = 0;
+ }
+ } else {
+ if (SEQ_GT((tp->snd_nxt - lost),
+ tp->snd_una)) {
+ tp->snd_nxt -= lost;
+ } else {
+ tp->snd_nxt = tp->snd_una;
+ }
+ }
}
}
out:
- if (tp->t_pktlist_head != NULL)
+ if (tp->t_pktlist_head != NULL) {
m_freem_list(tp->t_pktlist_head);
+ }
TCP_PKTLIST_CLEAR(tp);
if (error == ENOBUFS) {
- if (!tp->t_timer[TCPT_REXMT] &&
- !tp->t_timer[TCPT_PERSIST])
- tp->t_timer[TCPT_REXMT] = OFFSET_FROM_START(tp, tp->t_rxtcur);
-
+ /*
+ * Set retransmit timer if not currently set
+ * when we failed to send a segment that can be
+ * retransmitted (i.e. not pure ack or rst)
+ */
+ if (tp->t_timer[TCPT_REXMT] == 0 &&
+ tp->t_timer[TCPT_PERSIST] == 0 &&
+ (len != 0 || (flags & (TH_SYN | TH_FIN)) != 0 ||
+ so->so_snd.sb_cc > 0)) {
+ tp->t_timer[TCPT_REXMT] =
+ OFFSET_FROM_START(tp, tp->t_rxtcur);
+ }
tp->snd_cwnd = tp->t_maxseg;
tp->t_bytes_acked = 0;
-
tcp_check_timer_state(tp);
- KERNEL_DEBUG(DBG_FNC_TCP_OUTPUT | DBG_FUNC_END, 0,0,0,0,0);
+ KERNEL_DEBUG(DBG_FNC_TCP_OUTPUT | DBG_FUNC_END, 0, 0, 0, 0, 0);
- DTRACE_TCP5(cc, void, NULL, struct inpcb *, tp->t_inpcb,
- struct tcpcb *, tp, struct tcphdr *, NULL,
- int32_t, TCP_CC_OUTPUT_ERROR);
- return (0);
+ tcp_ccdbg_trace(tp, NULL, TCP_CC_OUTPUT_ERROR);
+ return 0;
}
if (error == EMSGSIZE) {
/*
* immediatly retry with MSS sized segments generated
* by this function.
*/
- if (tso)
+ if (tso) {
tp->t_flags &= ~TF_TSO;
+ }
- tcp_mtudisc(tp->t_inpcb, 0);
+ tcp_mtudisc(inp, 0);
tcp_check_timer_state(tp);
- KERNEL_DEBUG(DBG_FNC_TCP_OUTPUT | DBG_FUNC_END, 0,0,0,0,0);
+ KERNEL_DEBUG(DBG_FNC_TCP_OUTPUT | DBG_FUNC_END, 0, 0, 0, 0, 0);
return 0;
}
- if ((error == EHOSTUNREACH || error == ENETDOWN)
- && TCPS_HAVERCVDSYN(tp->t_state)) {
+ /*
+ * Unless this is due to interface restriction policy,
+ * treat EHOSTUNREACH/ENETDOWN/EADDRNOTAVAIL as a soft error.
+ */
+ if ((error == EHOSTUNREACH || error == ENETDOWN || error == EADDRNOTAVAIL) &&
+ TCPS_HAVERCVDSYN(tp->t_state) &&
+ !inp_restricted_send(inp, inp->inp_last_outifp)) {
tp->t_softerror = error;
- tcp_check_timer_state(tp);
- KERNEL_DEBUG(DBG_FNC_TCP_OUTPUT | DBG_FUNC_END, 0,0,0,0,0);
- return (0);
+ error = 0;
}
tcp_check_timer_state(tp);
- KERNEL_DEBUG(DBG_FNC_TCP_OUTPUT | DBG_FUNC_END, 0,0,0,0,0);
- return (error);
+ KERNEL_DEBUG(DBG_FNC_TCP_OUTPUT | DBG_FUNC_END, 0, 0, 0, 0, 0);
+ return error;
}
tcpstat.tcps_sndtotal++;
-#if INET6
- /*
- * Data sent (as far as we can tell).
- * If this advertises a larger window than any other segment,
- * then remember the size of the advertised window.
- * Make sure ACK/DELACK conditions are cleared before
- * we unlock the socket.
- * NOTE: for now, this is done in tcp_ip_output for IPv4
- */
- if (isipv6) {
- if (recwin > 0 && SEQ_GT(tp->rcv_nxt + recwin, tp->rcv_adv))
- tp->rcv_adv = tp->rcv_nxt + recwin;
- tp->last_ack_sent = tp->rcv_nxt;
- tp->t_flags &= ~(TF_ACKNOW | TF_DELACK);
- tp->t_timer[TCPT_DELACK] = 0;
- tp->t_unacksegs = 0;
- }
-#endif
-
- KERNEL_DEBUG(DBG_FNC_TCP_OUTPUT | DBG_FUNC_END,0,0,0,0,0);
- if (sendalot)
+ KERNEL_DEBUG(DBG_FNC_TCP_OUTPUT | DBG_FUNC_END, 0, 0, 0, 0, 0);
+ if (sendalot) {
goto again;
+ }
tcp_check_timer_state(tp);
- return (0);
+
+ return 0;
}
static int
tcp_ip_output(struct socket *so, struct tcpcb *tp, struct mbuf *pkt,
- int cnt, struct mbuf *opt, int flags, int sack_in_progress, int recwin)
+ int cnt, struct mbuf *opt, int flags, int sack_in_progress, boolean_t isipv6)
{
int error = 0;
boolean_t chain;
boolean_t unlocked = FALSE;
+ boolean_t ifdenied = FALSE;
struct inpcb *inp = tp->t_inpcb;
struct ip_out_args ipoa;
struct route ro;
- unsigned int outif;
+ struct ifnet *outif = NULL;
+ bool check_qos_marking_again = (so->so_flags1 & SOF1_QOSMARKING_POLICY_OVERRIDE) ? FALSE : TRUE;
+
+ bzero(&ipoa, sizeof(ipoa));
+ ipoa.ipoa_boundif = IFSCOPE_NONE;
+ ipoa.ipoa_flags = IPOAF_SELECT_SRCIF | IPOAF_BOUND_SRCADDR;
+ ipoa.ipoa_sotc = SO_TC_UNSPEC;
+ ipoa.ipoa_netsvctype = _NET_SERVICE_TYPE_UNSPEC;
+ struct ip6_out_args ip6oa;
+ struct route_in6 ro6;
+
+ bzero(&ip6oa, sizeof(ip6oa));
+ ip6oa.ip6oa_boundif = IFSCOPE_NONE;
+ ip6oa.ip6oa_flags = IP6OAF_SELECT_SRCIF | IP6OAF_BOUND_SRCADDR;
+ ip6oa.ip6oa_sotc = SO_TC_UNSPEC;
+ ip6oa.ip6oa_netsvctype = _NET_SERVICE_TYPE_UNSPEC;
+
+ struct flowadv *adv =
+ (isipv6 ? &ip6oa.ip6oa_flowadv : &ipoa.ipoa_flowadv);
/* If socket was bound to an ifindex, tell ip_output about it */
- ipoa.ipoa_boundif = (inp->inp_flags & INP_BOUND_IF) ?
- inp->inp_boundif : IFSCOPE_NONE;
- ipoa.ipoa_nocell = (inp->inp_flags & INP_NO_IFT_CELLULAR) ? 1 : 0;
- flags |= IP_OUTARGS;
+ if (inp->inp_flags & INP_BOUND_IF) {
+ if (isipv6) {
+ ip6oa.ip6oa_boundif = inp->inp_boundifp->if_index;
+ ip6oa.ip6oa_flags |= IP6OAF_BOUND_IF;
+ } else {
+ ipoa.ipoa_boundif = inp->inp_boundifp->if_index;
+ ipoa.ipoa_flags |= IPOAF_BOUND_IF;
+ }
+ }
+
+ if (INP_NO_CELLULAR(inp)) {
+ if (isipv6) {
+ ip6oa.ip6oa_flags |= IP6OAF_NO_CELLULAR;
+ } else {
+ ipoa.ipoa_flags |= IPOAF_NO_CELLULAR;
+ }
+ }
+ if (INP_NO_EXPENSIVE(inp)) {
+ if (isipv6) {
+ ip6oa.ip6oa_flags |= IP6OAF_NO_EXPENSIVE;
+ } else {
+ ipoa.ipoa_flags |= IPOAF_NO_EXPENSIVE;
+ }
+ }
+ if (INP_NO_CONSTRAINED(inp)) {
+ if (isipv6) {
+ ip6oa.ip6oa_flags |= IP6OAF_NO_CONSTRAINED;
+ } else {
+ ipoa.ipoa_flags |= IPOAF_NO_CONSTRAINED;
+ }
+ }
+ if (INP_AWDL_UNRESTRICTED(inp)) {
+ if (isipv6) {
+ ip6oa.ip6oa_flags |= IP6OAF_AWDL_UNRESTRICTED;
+ } else {
+ ipoa.ipoa_flags |= IPOAF_AWDL_UNRESTRICTED;
+ }
+ }
+ if (INP_INTCOPROC_ALLOWED(inp) && isipv6) {
+ ip6oa.ip6oa_flags |= IP6OAF_INTCOPROC_ALLOWED;
+ }
+ if (isipv6) {
+ ip6oa.ip6oa_sotc = so->so_traffic_class;
+ ip6oa.ip6oa_netsvctype = so->so_netsvctype;
+ ip6oa.qos_marking_gencount = inp->inp_policyresult.results.qos_marking_gencount;
+ } else {
+ ipoa.ipoa_sotc = so->so_traffic_class;
+ ipoa.ipoa_netsvctype = so->so_netsvctype;
+ ipoa.qos_marking_gencount = inp->inp_policyresult.results.qos_marking_gencount;
+ }
+ if ((so->so_flags1 & SOF1_QOSMARKING_ALLOWED)) {
+ if (isipv6) {
+ ip6oa.ip6oa_flags |= IP6OAF_QOSMARKING_ALLOWED;
+ } else {
+ ipoa.ipoa_flags |= IPOAF_QOSMARKING_ALLOWED;
+ }
+ }
+ if (check_qos_marking_again) {
+ if (isipv6) {
+ ip6oa.ip6oa_flags |= IP6OAF_REDO_QOSMARKING_POLICY;
+ } else {
+ ipoa.ipoa_flags |= IPOAF_REDO_QOSMARKING_POLICY;
+ }
+ }
+ if (isipv6) {
+ flags |= IPV6_OUTARGS;
+ } else {
+ flags |= IP_OUTARGS;
+ }
/* Copy the cached route and take an extra reference */
- inp_route_copyout(inp, &ro);
+ if (isipv6) {
+ in6p_route_copyout(inp, &ro6);
+ } else {
+ inp_route_copyout(inp, &ro);
+ }
/*
- * Data sent (as far as we can tell).
- * If this advertises a larger window than any other segment,
- * then remember the size of the advertised window.
* Make sure ACK/DELACK conditions are cleared before
* we unlock the socket.
*/
- if (recwin > 0 && SEQ_GT(tp->rcv_nxt + recwin, tp->rcv_adv))
- tp->rcv_adv = tp->rcv_nxt + recwin;
tp->last_ack_sent = tp->rcv_nxt;
tp->t_flags &= ~(TF_ACKNOW | TF_DELACK);
tp->t_timer[TCPT_DELACK] = 0;
tp->t_unacksegs = 0;
+ /* Increment the count of outstanding send operations */
+ inp->inp_sndinprog_cnt++;
+
/*
* If allowed, unlock TCP socket while in IP
* but only if the connection is established and
* - we're not in Fast Recovery mode
* - if we're not sending from an upcall.
*/
- if (tcp_output_unlocked && ((so->so_flags & SOF_UPCALLINUSE) == 0) &&
+ if (tcp_output_unlocked && !so->so_upcallusecount &&
(tp->t_state == TCPS_ESTABLISHED) && (sack_in_progress == 0) &&
- ((tp->t_flags & TF_FASTRECOVERY) == 0)) {
+ !IN_FASTRECOVERY(tp) && !(so->so_flags & SOF_MP_SUBFLOW)) {
unlocked = TRUE;
socket_unlock(so, 0);
}
-
+
/*
* Don't send down a chain of packets when:
* - TCP chaining is disabled
chain = tcp_packet_chaining > 1
#if IPSEC
- && ipsec_bypass
+ && ipsec_bypass
#endif
-#if IPFIREWALL
- && (fw_enable == 0 || fw_bypass)
-#endif
- ; // I'm important, not extraneous
-
+ ; // I'm important, not extraneous
while (pkt != NULL) {
struct mbuf *npkt = pkt->m_nextpkt;
/*
* If we are not chaining, make sure to set the packet
* list count to 0 so that IP takes the right path;
- * this is important for cases such as IPSec where a
+ * this is important for cases such as IPsec where a
* single mbuf might result in multiple mbufs as part
* of the encapsulation. If a non-zero count is passed
* down to IP, the head of the chain might change and
*/
cnt = 0;
}
- error = ip_output_list(pkt, cnt, opt, &ro, flags, 0, &ipoa);
+ if (isipv6) {
+ error = ip6_output_list(pkt, cnt,
+ inp->in6p_outputopts, &ro6, flags, NULL, NULL,
+ &ip6oa);
+ ifdenied = (ip6oa.ip6oa_retflags & IP6OARF_IFDENIED);
+ } else {
+ error = ip_output_list(pkt, cnt, opt, &ro, flags, NULL,
+ &ipoa);
+ ifdenied = (ipoa.ipoa_retflags & IPOARF_IFDENIED);
+ }
+
if (chain || error) {
/*
* If we sent down a chain then we are done since
* the callee had taken care of everything; else
* we need to free the rest of the chain ourselves.
*/
- if (!chain)
+ if (!chain) {
m_freem_list(npkt);
+ }
break;
}
pkt = npkt;
}
- if (unlocked)
+ if (unlocked) {
socket_lock(so, 0);
+ }
+
+ /*
+ * Enter flow controlled state if the connection is established
+ * and is not in recovery. Flow control is allowed only if there
+ * is outstanding data.
+ *
+ * A connection will enter suspended state even if it is in
+ * recovery.
+ */
+ if (((adv->code == FADV_FLOW_CONTROLLED && !IN_FASTRECOVERY(tp)) ||
+ adv->code == FADV_SUSPENDED) &&
+ !(tp->t_flags & TF_CLOSING) &&
+ tp->t_state == TCPS_ESTABLISHED &&
+ SEQ_GT(tp->snd_max, tp->snd_una)) {
+ int rc;
+ rc = inp_set_fc_state(inp, adv->code);
+
+ if (rc == 1) {
+ tcp_ccdbg_trace(tp, NULL,
+ ((adv->code == FADV_FLOW_CONTROLLED) ?
+ TCP_CC_FLOW_CONTROL : TCP_CC_SUSPEND));
+ }
+ }
+
+ /*
+ * When an interface queue gets suspended, some of the
+ * packets are dropped. Return ENOBUFS, to update the
+ * pcb state.
+ */
+ if (adv->code == FADV_SUSPENDED) {
+ error = ENOBUFS;
+ }
+
+ VERIFY(inp->inp_sndinprog_cnt > 0);
+ if (--inp->inp_sndinprog_cnt == 0) {
+ inp->inp_flags &= ~(INP_FC_FEEDBACK);
+ if (inp->inp_sndingprog_waiters > 0) {
+ wakeup(&inp->inp_sndinprog_cnt);
+ }
+ }
+
+ if (isipv6) {
+ /*
+ * When an NECP IP tunnel policy forces the outbound interface,
+ * ip6_output_list() informs the transport layer what is the actual
+ * outgoing interface
+ */
+ if (ip6oa.ip6oa_flags & IP6OAF_BOUND_IF) {
+ outif = ifindex2ifnet[ip6oa.ip6oa_boundif];
+ } else if (ro6.ro_rt != NULL) {
+ outif = ro6.ro_rt->rt_ifp;
+ }
+ } else {
+ if (ro.ro_rt != NULL) {
+ outif = ro.ro_rt->rt_ifp;
+ }
+ }
+ if (check_qos_marking_again) {
+ uint32_t qos_marking_gencount;
+ bool allow_qos_marking;
+ if (isipv6) {
+ qos_marking_gencount = ip6oa.qos_marking_gencount;
+ allow_qos_marking = ip6oa.ip6oa_flags & IP6OAF_QOSMARKING_ALLOWED ? TRUE : FALSE;
+ } else {
+ qos_marking_gencount = ipoa.qos_marking_gencount;
+ allow_qos_marking = ipoa.ipoa_flags & IPOAF_QOSMARKING_ALLOWED ? TRUE : FALSE;
+ }
+ inp->inp_policyresult.results.qos_marking_gencount = qos_marking_gencount;
+ if (allow_qos_marking == TRUE) {
+ inp->inp_socket->so_flags1 |= SOF1_QOSMARKING_ALLOWED;
+ } else {
+ inp->inp_socket->so_flags1 &= ~SOF1_QOSMARKING_ALLOWED;
+ }
+ }
+
+ if (outif != NULL && outif != inp->inp_last_outifp) {
+ /* Update the send byte count */
+ if (so->so_snd.sb_cc > 0 && so->so_snd.sb_flags & SB_SNDBYTE_CNT) {
+ inp_decr_sndbytes_total(so, so->so_snd.sb_cc);
+ inp_decr_sndbytes_allunsent(so, tp->snd_una);
+ so->so_snd.sb_flags &= ~SB_SNDBYTE_CNT;
+ }
+ inp->inp_last_outifp = outif;
+ }
- if (ro.ro_rt != NULL &&
- (outif = ro.ro_rt->rt_ifp->if_index) != inp->inp_last_outif)
- inp->inp_last_outif = outif;
+ if (error != 0 && ifdenied &&
+ (INP_NO_CELLULAR(inp) || INP_NO_EXPENSIVE(inp) || INP_NO_CONSTRAINED(inp))) {
+ soevent(so,
+ (SO_FILT_HINT_LOCKED | SO_FILT_HINT_IFDENIED));
+ }
- /* Synchronize cached PCB route */
- inp_route_copyin(inp, &ro);
+ /* Synchronize cached PCB route & options */
+ if (isipv6) {
+ in6p_route_copyin(inp, &ro6);
+ } else {
+ inp_route_copyin(inp, &ro);
+ }
- return (error);
+ if (tp->t_state < TCPS_ESTABLISHED && tp->t_rxtshift == 0 &&
+ tp->t_inpcb->inp_route.ro_rt != NULL) {
+ /* If we found the route and there is an rtt on it
+ * reset the retransmit timer
+ */
+ tcp_getrt_rtt(tp, tp->t_inpcb->in6p_route.ro_rt);
+ tp->t_timer[TCPT_REXMT] = OFFSET_FROM_START(tp, tp->t_rxtcur);
+ }
+ return error;
}
+int tcptv_persmin_val = TCPTV_PERSMIN;
+
void
-tcp_setpersist(tp)
- register struct tcpcb *tp;
+tcp_setpersist(struct tcpcb *tp)
{
int t = ((tp->t_srtt >> 2) + tp->t_rttvar) >> 1;
* see rdar://5805356
*/
- if ((tp->t_persist_timeout != 0) &&
- (tp->t_timer[TCPT_PERSIST] == 0) &&
- (tp->t_persist_stop == 0)) {
+ if (tp->t_persist_timeout != 0 &&
+ tp->t_timer[TCPT_PERSIST] == 0 &&
+ tp->t_persist_stop == 0) {
tp->t_persist_stop = tcp_now + tp->t_persist_timeout;
}
*/
TCPT_RANGESET(tp->t_timer[TCPT_PERSIST],
t * tcp_backoff[tp->t_rxtshift],
- TCPTV_PERSMIN, TCPTV_PERSMAX,
- TCP_ADD_REXMTSLOP(tp));
+ tcptv_persmin_val, TCPTV_PERSMAX, 0);
tp->t_timer[TCPT_PERSIST] = OFFSET_FROM_START(tp, tp->t_timer[TCPT_PERSIST]);
- if (tp->t_rxtshift < TCP_MAXRXTSHIFT)
+ if (tp->t_rxtshift < TCP_MAXRXTSHIFT) {
tp->t_rxtshift++;
+ }
+}
+
+static int
+tcp_recv_throttle(struct tcpcb *tp)
+{
+ uint32_t base_rtt, newsize;
+ struct sockbuf *sbrcv = &tp->t_inpcb->inp_socket->so_rcv;
+
+ if (tcp_use_rtt_recvbg == 1 &&
+ TSTMP_SUPPORTED(tp)) {
+ /*
+ * Timestamps are supported on this connection. Use
+ * RTT to look for an increase in latency.
+ */
+
+ /*
+ * If the connection is already being throttled, leave it
+ * in that state until rtt comes closer to base rtt
+ */
+ if (tp->t_flagsext & TF_RECV_THROTTLE) {
+ return 1;
+ }
+
+ base_rtt = get_base_rtt(tp);
+
+ if (base_rtt != 0 && tp->t_rttcur != 0) {
+ /*
+ * if latency increased on a background flow,
+ * return 1 to start throttling.
+ */
+ if (tp->t_rttcur > (base_rtt + target_qdelay)) {
+ tp->t_flagsext |= TF_RECV_THROTTLE;
+ if (tp->t_recv_throttle_ts == 0) {
+ tp->t_recv_throttle_ts = tcp_now;
+ }
+ /*
+ * Reduce the recv socket buffer size to
+ * minimize latecy.
+ */
+ if (sbrcv->sb_idealsize >
+ tcp_recv_throttle_minwin) {
+ newsize = sbrcv->sb_idealsize >> 1;
+ /* Set a minimum of 16 K */
+ newsize =
+ max(newsize,
+ tcp_recv_throttle_minwin);
+ sbrcv->sb_idealsize = newsize;
+ }
+ return 1;
+ } else {
+ return 0;
+ }
+ }
+ }
+
+ /*
+ * Timestamps are not supported or there is no good RTT
+ * measurement. Use IPDV in this case.
+ */
+ if (tp->acc_iaj > tcp_acc_iaj_react_limit) {
+ return 1;
+ }
+
+ return 0;
}
projects / apple / xnu.git / blobdiff