#define _IP_VHL
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <sys/mbuf.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.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>
#include <netinet6/in6_pcb.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet/tcp.h>
#define TCPOUTFLAGS
#include <netinet/tcp_cache.h>
#include <netinet/tcp_fsm.h>
#include <netinet/tcp_seq.h>
#include <netinet/tcp_timer.h>
#include <netinet/tcp_var.h>
#include <netinet/tcpip.h>
#include <netinet/tcp_cc.h>
#if TCPDEBUG
#include <netinet/tcp_debug.h>
#endif
#include <netinet/tcp_log.h>
#include <sys/kdebug.h>
#include <mach/sdt.h>
#if IPSEC
#include <netinet6/ipsec.h>
#endif
#if MPTCP
#include <netinet/mptcp_var.h>
#include <netinet/mptcp.h>
#include <netinet/mptcp_opt.h>
#include <netinet/mptcp_seq.h>
#endif
#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)
SYSCTL_SKMEM_TCP_INT(OID_AUTO, path_mtu_discovery,
CTLFLAG_RW | CTLFLAG_LOCKED, int, path_mtu_discovery, 1,
"Enable Path MTU Discovery");
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;
SYSCTL_INT(_net_inet_tcp, OID_AUTO, tso, CTLFLAG_RW | CTLFLAG_LOCKED,
&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)) {
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 {
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);
}
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");
SYSCTL_SKMEM_TCP_INT(OID_AUTO, packetchain,
CTLFLAG_RW | CTLFLAG_LOCKED, int, tcp_packet_chaining, 50,
"Enable TCP output packet chaining");
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");
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");
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");
SYSCTL_SKMEM_TCP_INT(OID_AUTO, autosndbufinc,
CTLFLAG_RW | CTLFLAG_LOCKED, uint32_t, tcp_autosndbuf_inc,
8 * 1024, "Increment in send socket bufffer size");
SYSCTL_SKMEM_TCP_INT(OID_AUTO, autosndbufmax,
CTLFLAG_RW | CTLFLAG_LOCKED, uint32_t, tcp_autosndbuf_max, 2 * 1024 * 1024,
"Maximum send socket buffer size");
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;
static int32_t packchain_sent = 0;
#if IPSEC
extern int ipsec_bypass;
#endif
extern int slowlink_wsize;
extern u_int32_t dlil_filter_disable_tso_count;
extern u_int32_t kipf_count;
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
if (tp->t_flags & TF_REQ_TSTMP) {
optlen += TCPOLEN_TSTAMP_APPA;
}
if (SACK_ENABLED(tp)) {
optlen += TCPOLEN_SACK_PERMITTED;
}
if (MAX_TCPOPTLEN - optlen < TCPOLEN_FASTOPEN_REQ) {
goto fallback;
}
cookie_len = tcp_cache_get_cookie_len(tp);
if (cookie_len == 0) {
return 0;
}
if (MAX_TCPOPTLEN - optlen < cookie_len) {
goto fallback;
}
if (so->so_snd.sb_cc > (tp->t_maxopd - MAX_TCPOPTLEN)) {
goto fallback;
}
return len;
fallback:
tcp_disable_tfo(tp);
return 0;
}
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 (len > 0) {
tp->t_tfo_stats |= TFO_S_SYN_DATA_SENT;
tcpstat.tcps_tfo_syn_data_sent++;
}
return 0;
}
bp = opt + optlen;
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 (len > 0) {
tp->t_tfo_stats |= TFO_S_SYN_DATA_SENT;
tcpstat.tcps_tfo_syn_data_sent++;
}
}
return ret;
}
static inline bool
tcp_send_ecn_flags_on_syn(struct tcpcb *tp)
{
return !(tp->ecn_flags & TE_SETUPSENT);
}
void
tcp_set_ecn(struct tcpcb *tp, struct ifnet *ifp)
{
boolean_t inbound;
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;
}
if (ifp != NULL) {
if (ifp->if_eflags & IFEF_ECN_ENABLE) {
tp->ecn_flags |= TE_ENABLE_ECN;
goto check_heuristic;
}
if (ifp->if_eflags & IFEF_ECN_DISABLE) {
tp->ecn_flags &= ~TE_ENABLE_ECN;
return;
}
}
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;
}
if ((tp->ecn_flags & (TE_ECN_MODE_ENABLE | TE_ECN_MODE_DISABLE
| TE_ENABLE_ECN)) == TE_ENABLE_ECN) {
if ((tp->iss % 100) >= tcp_ecn_setup_percentage) {
tp->ecn_flags &= ~TE_ENABLE_ECN;
}
}
}
int
tcp_flight_size(struct tcpcb *tp)
{
int ret;
VERIFY(tp->sackhint.sack_bytes_acked >= 0);
VERIFY(tp->sackhint.sack_bytes_rexmit >= 0);
ret = tp->snd_nxt - tp->snd_una - tp->sackhint.sack_bytes_acked;
if (ret < 0) {
ret = 0;
}
return ret;
}
int
tcp_output(struct tcpcb *tp)
{
struct inpcb *inp = tp->t_inpcb;
struct socket *so = inp->inp_socket;
int32_t len, recwin, sendwin, off;
uint8_t flags;
int error;
struct mbuf *m;
struct ip *ip = NULL;
struct ip6_hdr *ip6 = NULL;
struct tcphdr *th;
u_char opt[TCP_MAXOLEN];
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;
#if IPSEC
unsigned int ipsec_optlen = 0;
#endif
int idle_time = 0;
struct mbuf *packetlist = NULL;
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
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;
idle = (tp->t_flags & TF_LASTIDLE) || (tp->snd_max == tp->snd_una);
idle_time = tcp_now - tp->t_rcvtime;
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);
tcp_ccdbg_trace(tp, NULL, TCP_CC_IDLE_TIMEOUT);
}
if (!SLIST_EMPTY(&tp->t_rxt_segments)) {
tcp_rxtseg_clean(tp);
}
tcp_cc_after_idle_stretchack(tp);
tp->t_forced_acks = TCP_FORCED_ACKS_COUNT;
}
tp->t_flags &= ~TF_LASTIDLE;
if (idle) {
if (tp->t_flags & TF_MORETOCOME) {
tp->t_flags |= TF_LASTIDLE;
idle = 0;
}
}
#if MPTCP
if (tp->t_mpflags & TMPF_RESET) {
tcp_check_timer_state(tp);
return 0;
}
#endif
again:
#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 (isipv6) {
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 {
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)),
sendalot, 0, 0);
}
rt = inp->inp_route.ro_rt;
if (rt != NULL && ROUTE_UNUSABLE(&tp->t_inpcb->inp_route)) {
struct ifnet *ifp;
struct in_ifaddr *ia = NULL;
struct in6_ifaddr *ia6 = NULL;
int found_srcaddr = 0;
somultipages(so, FALSE);
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;
}
}
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;
}
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_persist_stop = 0;
TCP_RESET_REXMT_STATE(tp);
}
}
if (tp->t_pktlist_head != NULL) {
m_freem_list(tp->t_pktlist_head);
}
TCP_PKTLIST_CLEAR(tp);
if (so->so_flags & SOF_NOADDRAVAIL) {
tcp_drop(tp, EADDRNOTAVAIL);
return EADDRNOTAVAIL;
} else {
tcp_check_timer_state(tp);
return 0;
}
}
if (ia != NULL) {
IFA_REMREF(&ia->ia_ifa);
}
if (ia6 != NULL) {
IFA_REMREF(&ia6->ia_ifa);
}
RT_LOCK(rt);
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 (!path_mtu_discovery || ((rt != NULL) &&
(!(rt->rt_flags & RTF_UP) ||
(rt->rt_rmx.rmx_locks & RTV_MTU)))) {
tp->t_flags &= ~TF_PMTUD;
} 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));
}
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) {
sendwin = min(sendwin, slowlink_wsize);
}
flags = tcp_outflags[tp->t_state];
sack_rxmit = 0;
sack_bytes_rxmt = 0;
len = 0;
p = NULL;
if (SACK_ENABLED(tp) && IN_FASTRECOVERY(tp) &&
(p = tcp_sack_output(tp, &sack_bytes_rxmt))) {
int32_t cwin;
if (tcp_do_better_lr) {
cwin = min(tp->snd_wnd, tp->snd_cwnd) - tcp_flight_size(tp);
if (cwin <= 0 && sack_rxmted == FALSE) {
cwin = tp->t_maxseg;
}
sack_rxmted = TRUE;
} else {
cwin = min(tp->snd_wnd, tp->snd_cwnd) - sack_bytes_rxmt;
}
if (cwin < 0) {
cwin = 0;
}
if (SEQ_GT(p->end, tp->snd_recover)) {
if (SEQ_GEQ(p->rxmit, tp->snd_recover)) {
p = NULL;
goto after_sack_rexmit;
} else {
len = ((int32_t)min(cwin,
tp->snd_recover - p->rxmit));
}
} else {
len = ((int32_t)min(cwin, p->end - p->rxmit));
}
if (len > 0) {
off = p->rxmit - tp->snd_una;
sack_rxmit = 1;
sendalot = 1;
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);
} else {
len = 0;
}
}
after_sack_rexmit:
if (tp->t_flags & TF_NEEDFIN) {
flags |= TH_FIN;
}
if (tp->t_flagsext & TF_FORCE) {
if (sendwin == 0) {
if (off < so->so_snd.sb_cc) {
flags &= ~TH_FIN;
}
sendwin = 1;
} else {
tp->t_timer[TCPT_PERSIST] = 0;
tp->t_persist_stop = 0;
TCP_RESET_REXMT_STATE(tp);
}
}
if (sack_rxmit == 0) {
if (sack_bytes_rxmt == 0) {
len = min(so->so_snd.sb_cc, sendwin) - off;
} 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;
}
len = min(so->so_snd.sb_cc, tp->snd_wnd) - off;
if (len > 0) {
len = imin(len, cwin);
} else {
len = 0;
}
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 ((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;
}
}
}
if ((flags & TH_SYN) && SEQ_GT(tp->snd_nxt, tp->snd_una)) {
if (tp->t_state == TCPS_SYN_RECEIVED && tfo_enabled(tp) && tp->snd_nxt == tp->snd_una + 1) {
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);
}
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;
}
}
}
if ((flags & TH_SYN) && !tfo_enabled(tp)) {
len = 0;
flags &= ~TH_FIN;
}
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);
}
if (len <= 0 && !(flags & TH_SYN)) {
len = 0;
if (sendwin == 0) {
tp->t_timer[TCPT_REXMT] = 0;
tp->t_timer[TCPT_PTO] = 0;
TCP_RESET_REXMT_STATE(tp);
tp->snd_nxt = tp->snd_una;
off = 0;
if (tp->t_timer[TCPT_PERSIST] == 0) {
tcp_setpersist(tp);
}
}
}
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;
}
}
}
#if IPSEC
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 && 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
) {
tso = 1;
sendalot = 0;
} else {
len = tp->t_maxseg;
sendalot = 1;
tso = 0;
}
} else {
tso = 0;
}
if (tp->t_flagsext & TF_SENT_TLPROBE) {
len = min(len, tp->t_maxseg);
sendalot = 0;
tso = 0;
}
#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;
}
if (!(tp->t_mpflags & TMPF_PREESTABLISHED)) {
sendalot = 1;
}
mptcp_acknow = TRUE;
} else {
mptcp_acknow = FALSE;
}
if (len > 0 && off >= 0) {
newlen = mptcp_adj_sendlen(so, off);
}
if (newlen < len) {
len = newlen;
if (len <= tp->t_maxseg) {
tso = 0;
}
}
}
#endif
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;
}
}
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
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);
VERIFY(recwin_announced < INT32_MAX && recwin_announced > INT32_MIN);
if (recwin < (int32_t)recwin_announced) {
recwin = (int32_t)recwin_announced;
}
}
if (len) {
if (tp->t_flagsext & TF_FORCE) {
goto send;
}
if (SEQ_LT(tp->snd_nxt, tp->snd_max)) {
goto send;
}
if (sack_rxmit) {
goto send;
}
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 (!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 ||
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 (recwin > 0) {
int32_t adv, oldwin = 0;
adv = imin(recwin, (int)TCP_MAXWIN << tp->rcv_scale) -
(tp->rcv_adv - tp->rcv_nxt);
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)) {
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)) {
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 (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;
}
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 (tp->t_flags & TF_ACKNOW) {
if (tp->t_forced_acks > 0) {
tp->t_forced_acks--;
}
goto send;
}
if ((flags & TH_RST) || (flags & TH_SYN)) {
goto send;
}
if (SEQ_GT(tp->snd_up, tp->snd_una)) {
goto send;
}
#if MPTCP
if (mptcp_acknow) {
goto send;
}
#endif
if ((flags & TH_FIN) &&
(!(tp->t_flags & TF_SENTFIN) || tp->snd_nxt == tp->snd_una)) {
goto send;
}
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;
}
if (so->so_snd.sb_cc && tp->t_timer[TCPT_REXMT] == 0 &&
tp->t_timer[TCPT_PERSIST] == 0) {
TCP_RESET_REXMT_STATE(tp);
tcp_setpersist(tp);
}
just_return:
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);
}
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;
send:
if (len > 0) {
do_not_compress = TRUE;
if (len >= tp->t_maxseg) {
tp->t_flags |= TF_MAXSEGSNT;
} else {
tp->t_flags &= ~TF_MAXSEGSNT;
}
}
optlen = 0;
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) {
u_short mss;
opt[0] = TCPOPT_MAXSEG;
opt[1] = TCPOLEN_MAXSEG;
mss = htons((u_short) tcp_mssopt(tp));
(void)memcpy(opt + 2, &mss, sizeof(mss));
optlen = TCPOLEN_MAXSEG;
if ((tp->t_flags & TF_REQ_SCALE) &&
((flags & TH_ACK) == 0 ||
(tp->t_flags & TF_RCVD_SCALE))) {
*((u_int32_t *)(void *)(opt + optlen)) = htonl(
TCPOPT_NOP << 24 |
TCPOPT_WINDOW << 16 |
TCPOLEN_WINDOW << 8 |
tp->request_r_scale);
optlen += 4;
}
#if MPTCP
if (mptcp_enable && (so->so_flags & SOF_MP_SUBFLOW)) {
optlen = mptcp_setup_syn_opts(so, opt, optlen);
}
#endif
}
}
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 *)(void *)(opt + optlen);
*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)) {
if ((flags & TH_SYN) &&
(!(flags & TH_ACK) || (tp->t_flags & TF_SACK_PERMIT))) {
u_char *bp;
bp = (u_char *)opt + optlen;
*bp++ = TCPOPT_SACK_PERMITTED;
*bp++ = TCPOLEN_SACK_PERMITTED;
optlen += TCPOLEN_SACK_PERMITTED;
}
}
#if MPTCP
if (so->so_flags & SOF_MP_SUBFLOW) {
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
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)) {
if (TCPS_HAVEESTABLISHED(tp->t_state) &&
(tp->t_flags & TF_SACK_PERMIT) &&
(tp->rcv_numsacks > 0 || TCP_SEND_DSACK_OPT(tp)) &&
MAX_TCPOPTLEN - optlen - 2 >= TCPOLEN_SACK) {
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 +
(TCP_SEND_DSACK_OPT(tp) ? 1 : 0)));
sackoptlen = (2 + nsack * TCPOLEN_SACK);
VERIFY(sackoptlen < UINT8_MAX);
padlen = (MAX_TCPOPTLEN - optlen - sackoptlen) % 4;
optlen += padlen;
while (padlen-- > 0) {
*bp++ = TCPOPT_NOP;
}
tcpstat.tcps_sack_send_blocks++;
*bp++ = TCPOPT_SACK;
*bp++ = (uint8_t)sackoptlen;
lp = (u_int32_t *)(void *)bp;
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);
*lp++ = htonl(sack.end);
}
optlen += sackoptlen;
}
}
if (optlen < MAX_TCPOPTLEN && (optlen % sizeof(u_int32_t))) {
int pad = sizeof(u_int32_t) - (optlen % sizeof(u_int32_t));
u_char *bp = (u_char *)opt + optlen;
optlen += pad;
while (pad) {
*bp++ = TCPOPT_EOL;
pad--;
}
}
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)) {
flags |= TH_ECE;
tp->ecn_flags |= (TE_SETUPSENT | TE_SENDIPECT);
tcpstat.tcps_ecn_server_setup++;
tcpstat.tcps_ecn_server_success++;
} else {
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)) {
flags |= (TH_ECE | TH_CWR);
tcpstat.tcps_ecn_client_setup++;
tp->ecn_flags |= TE_CLIENT_SETUP;
tp->ecn_flags |= (TE_SETUPSENT | TE_SENDIPECT);
} else {
if (tp->ecn_flags & TE_SETUPSENT) {
tcpstat.tcps_ecn_lost_syn++;
tp->ecn_flags |= TE_LOST_SYN;
}
tp->ecn_flags &= ~TE_SENDIPECT;
}
}
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;
}
if ((tp->ecn_flags & TE_SENDECE) != 0 && len == 0) {
flags |= TH_ECE;
tcpstat.tcps_ecn_sent_ece++;
}
hdrlen += optlen;
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 {
ipoptlen = 0;
}
}
#if IPSEC
ipoptlen += ipsec_optlen;
#endif
if (len + optlen + ipoptlen > tp->t_maxopd) {
flags &= ~TH_FIN;
if (tso) {
int32_t tso_maxlen;
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;
sendalot = 1;
} 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;
}
}
if (max_linkhdr + hdrlen > MCLBYTES) {
panic("tcphdr too big");
}
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);
if (len) {
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) {
tcpstat.tcps_sndrexmitpack++;
tcpstat.tcps_sndrexmitbyte += len;
if (nstat_collect) {
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) {
INP_ADD_STAT(inp, cell, wifi, wired,
txpackets, 1);
INP_ADD_STAT(inp, cell, wifi, wired,
txbytes, len);
}
inp_decr_sndbytes_unsent(so, len);
}
inp_set_activity_bitmap(inp);
#if MPTCP
if (tp->t_mpflags & TMPF_MPTCP_TRUE) {
tcpstat.tcps_mp_sndpacks++;
tcpstat.tcps_mp_sndbytes += len;
}
#endif
m = NULL;
allocated_len = MHLEN;
if (MHLEN < hdrlen + max_linkhdr) {
MGETHDR(m, M_DONTWAIT, MT_HEADER);
if (m == NULL) {
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;
}
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;
goto out;
}
m->m_data += max_linkhdr;
m->m_len = hdrlen;
}
if (so->so_snd.sb_mb == NULL || off < 0) {
if (m != NULL) {
m_freem(m);
}
error = 0;
goto out;
}
m_copydata(so->so_snd.sb_mb, off, (int) len,
mtod(m, caddr_t) + hdrlen);
m->m_len += len;
} else {
uint32_t copymode;
copymode = M_COPYM_MOVE_HDR;
#if MPTCP
if (so->so_flags & SOF_MP_SUBFLOW) {
copymode = M_COPYM_NOOP_HDR;
}
#endif
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 {
if (so->so_snd.sb_mb == NULL) {
error = 0;
goto out;
}
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;
}
}
if (off + len == so->so_snd.sb_cc && !(flags & TH_SYN)) {
flags |= TH_PUSH;
}
} else {
if (tp->t_flags & TF_ACKNOW) {
tcpstat.tcps_sndacks++;
} else if (flags & (TH_SYN | TH_FIN | TH_RST)) {
tcpstat.tcps_sndctrl++;
} else if (SEQ_GT(tp->snd_up, tp->snd_una)) {
tcpstat.tcps_sndurg++;
} else {
tcpstat.tcps_sndwinup++;
}
MGETHDR(m, M_DONTWAIT, MT_HEADER);
if (m == NULL) {
error = ENOBUFS;
goto out;
}
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 (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++;
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 *)(void *)(ip6 + 1);
tcp_fillheaders(tp, ip6, th);
if ((tp->ecn_flags & TE_SENDIPECT) != 0 && len &&
!SEQ_LT(tp->snd_nxt, tp->snd_max) && !sack_rxmit) {
ip6->ip6_flow |= htonl(IPTOS_ECN_ECT0 << 20);
}
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
} else {
ip = mtod(m, struct ip *);
th = (struct tcphdr *)(void *)(ip + 1);
tcp_fillheaders(tp, ip, th);
if ((tp->ecn_flags & TE_SENDIPECT) != 0 && len &&
!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
}
if ((flags & TH_FIN) && (tp->t_flags & TF_SENTFIN) &&
tp->snd_nxt == tp->snd_max) {
tp->snd_nxt--;
}
if (sack_rxmit == 0) {
if (len || (flags & (TH_SYN | TH_FIN)) ||
tp->t_timer[TCPT_PERSIST]) {
th->th_seq = htonl(tp->snd_nxt);
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_flags = flags;
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 (recwin > 0 && MPTCP_SEQ_LT(mp_tp->mpt_rcvadv, mp_tp->mpt_rcvnxt + recwin)) {
mp_tp->mpt_rcvadv = mp_tp->mpt_rcvnxt + recwin;
}
}
if (th->th_win == 0) {
tp->t_flags |= TF_RXWIN0SENT;
} 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 {
tp->snd_up = tp->snd_una;
}
m->m_pkthdr.len = hdrlen + len;
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) {
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 {
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 (tso) {
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 {
m->m_pkthdr.tso_segsz = 0;
}
if (!(tp->t_flagsext & TF_FORCE)
|| tp->t_timer[TCPT_PERSIST] == 0) {
tcp_seq startseq = tp->snd_nxt;
if (flags & (TH_SYN | TH_FIN)) {
if (flags & TH_SYN) {
tp->snd_nxt++;
}
if ((flags & TH_FIN) &&
!(tp->t_flags & TF_SENTFIN)) {
tp->snd_nxt++;
tp->t_flags |= TF_SENTFIN;
}
}
if (sack_rxmit) {
goto timer;
}
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;
if (tp->t_rtttime == 0) {
tp->t_rtttime = tcp_now;
tp->t_rtseq = startseq;
tcpstat.tcps_segstimed++;
tp->t_pipeack_lastuna = tp->snd_una;
}
}
timer:
if (tp->t_timer[TCPT_REXMT] == 0 &&
((sack_rxmit && tp->snd_nxt != tp->snd_max) ||
tp->snd_nxt != tp->snd_una || (flags & TH_FIN))) {
if (tp->t_timer[TCPT_PERSIST]) {
tp->t_timer[TCPT_PERSIST] = 0;
tp->t_persist_stop = 0;
TCP_RESET_REXMT_STATE(tp);
}
tp->t_timer[TCPT_REXMT] =
OFFSET_FROM_START(tp, tp->t_rxtcur);
}
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 {
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 (tp->t_rxtcur < pto) {
pto = tp->t_rxtcur;
}
tp->t_timer[TCPT_PTO] = OFFSET_FROM_START(tp, pto);
}
} else {
int xlen = len;
if (flags & TH_SYN) {
++xlen;
}
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)) {
tp->snd_max = tp->snd_nxt + len;
tp->t_sndtime = tcp_now;
}
}
#if TCPDEBUG
if (so_options & SO_DEBUG) {
tcp_trace(TA_OUTPUT, tp->t_state, tp, mtod(m, void *), th, 0);
}
#endif
if (isipv6) {
ip6->ip6_hlim = in6_selecthlim(inp, inp->in6p_route.ro_rt ?
inp->in6p_route.ro_rt->rt_ifp : NULL);
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;
ip->ip_tos |= (inp->inp_ip_tos & ~IPTOS_ECN_MASK);
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);
}
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 (net_qos_policy_restricted != 0) {
necp_socket_update_qos_marking(inp, inp->inp_route.ro_rt, route_rule_id);
}
}
#endif
#if IPSEC
if (inp->inp_sp != NULL) {
ipsec_setsocket(m, so);
}
#endif
lost = 0;
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 (inp->inp_last_outifp != NULL &&
!(inp->inp_last_outifp->if_flags & IFF_LOOPBACK)) {
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 {
(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++;
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;
tp->t_pktlist_tail = m;
} else {
packchain_newlist++;
tp->t_pktlist_head = tp->t_pktlist_tail = m;
}
if (sendalot == 0 || (tp->t_state != TCPS_ESTABLISHED) ||
(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 (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);
error = tcp_ip_output(so, tp, packetlist,
packchain_listadd, tp_inp_options,
(so_options & SO_DONTROUTE),
(sack_rxmit || (sack_bytes_rxmt != 0)), isipv6);
if (error) {
lost += tp->t_pktlist_sentlen;
break;
} else {
lost = 0;
}
}
if (inp->inp_sndinprog_cnt == 0 &&
(tp->t_flags & TF_CLOSING)) {
tp->t_flags &= ~TF_CLOSING;
(void) tcp_close(tp);
return 0;
}
} else {
error = 0;
packchain_looped++;
tcpstat.tcps_sndtotal++;
goto again;
}
if (error) {
if (!(tp->t_flagsext & TF_FORCE)
|| tp->t_timer[TCPT_PERSIST] == 0) {
if ((flags & TH_SYN) == 0) {
if (sack_rxmit) {
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;
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) {
m_freem_list(tp->t_pktlist_head);
}
TCP_PKTLIST_CLEAR(tp);
if (error == ENOBUFS) {
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);
tcp_ccdbg_trace(tp, NULL, TCP_CC_OUTPUT_ERROR);
return 0;
}
if (error == EMSGSIZE) {
if (tso) {
tp->t_flags &= ~TF_TSO;
}
tcp_mtudisc(inp, 0);
tcp_check_timer_state(tp);
KERNEL_DEBUG(DBG_FNC_TCP_OUTPUT | DBG_FUNC_END, 0, 0, 0, 0, 0);
return 0;
}
if ((error == EHOSTUNREACH || error == ENETDOWN || error == EADDRNOTAVAIL) &&
TCPS_HAVERCVDSYN(tp->t_state) &&
!inp_restricted_send(inp, inp->inp_last_outifp)) {
tp->t_softerror = error;
error = 0;
}
tcp_check_timer_state(tp);
KERNEL_DEBUG(DBG_FNC_TCP_OUTPUT | DBG_FUNC_END, 0, 0, 0, 0, 0);
return error;
}
tcpstat.tcps_sndtotal++;
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;
}
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, 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;
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 (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;
}
if (isipv6) {
in6p_route_copyout(inp, &ro6);
} else {
inp_route_copyout(inp, &ro);
}
tp->last_ack_sent = tp->rcv_nxt;
tp->t_flags &= ~(TF_ACKNOW | TF_DELACK);
tp->t_timer[TCPT_DELACK] = 0;
tp->t_unacksegs = 0;
inp->inp_sndinprog_cnt++;
if (tcp_output_unlocked && !so->so_upcallusecount &&
(tp->t_state == TCPS_ESTABLISHED) && (sack_in_progress == 0) &&
!IN_FASTRECOVERY(tp) && !(so->so_flags & SOF_MP_SUBFLOW)) {
unlocked = TRUE;
socket_unlock(so, 0);
}
chain = tcp_packet_chaining > 1
#if IPSEC
&& ipsec_bypass
#endif
;
while (pkt != NULL) {
struct mbuf *npkt = pkt->m_nextpkt;
if (!chain) {
pkt->m_nextpkt = NULL;
cnt = 0;
}
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 (!chain) {
m_freem_list(npkt);
}
break;
}
pkt = npkt;
}
if (unlocked) {
socket_lock(so, 0);
}
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));
}
}
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) {
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) {
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 (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));
}
if (isipv6) {
in6p_route_copyin(inp, &ro6);
} else {
inp_route_copyin(inp, &ro);
}
if (tp->t_state < TCPS_ESTABLISHED && tp->t_rxtshift == 0 &&
tp->t_inpcb->inp_route.ro_rt != NULL) {
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(struct tcpcb *tp)
{
int t = ((tp->t_srtt >> 2) + tp->t_rttvar) >> 1;
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_val, TCPTV_PERSMAX, 0);
tp->t_timer[TCPT_PERSIST] = OFFSET_FROM_START(tp, tp->t_timer[TCPT_PERSIST]);
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)) {
if (tp->t_flagsext & TF_RECV_THROTTLE) {
return 1;
}
base_rtt = get_base_rtt(tp);
if (base_rtt != 0 && tp->t_rttcur != 0) {
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;
}
if (sbrcv->sb_idealsize >
tcp_recv_throttle_minwin) {
newsize = sbrcv->sb_idealsize >> 1;
newsize =
max(newsize,
tcp_recv_throttle_minwin);
sbrcv->sb_idealsize = newsize;
}
return 1;
} else {
return 0;
}
}
}
if (tp->acc_iaj > tcp_acc_iaj_react_limit) {
return 1;
}
return 0;
}