/*
- * Copyright (c) 2000-2011 Apple Inc. All rights reserved.
+ * Copyright (c) 2000-2012 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
#include <net/route.h>
#include <net/ntstat.h>
#include <net/if_var.h>
+#include <net/if.h>
+#include <net/if_types.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <security/mac_framework.h>
#endif /* MAC_SOCKET */
+#include <netinet/lro_ext.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_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");
+uint32_t tcp_do_autosendbuf = 1;
+SYSCTL_INT(_net_inet_tcp, OID_AUTO, doautosndbuf, CTLFLAG_RW | CTLFLAG_LOCKED,
+ &tcp_do_autosendbuf, 1, "Enable send socket buffer auto-tuning");
+
+uint32_t tcp_autosndbuf_inc = 8 * 1024;
+SYSCTL_INT(_net_inet_tcp, OID_AUTO, autosndbufinc, CTLFLAG_RW | CTLFLAG_LOCKED,
+ &tcp_autosndbuf_inc, 1, "Increment in send socket bufffer size");
+
+uint32_t tcp_autosndbuf_max = 512 * 1024;
+SYSCTL_INT(_net_inet_tcp, OID_AUTO, autosndbufmax, CTLFLAG_RW | CTLFLAG_LOCKED,
+ &tcp_autosndbuf_max, 1, "Maximum send socket buffer size");
+
+uint32_t tcp_prioritize_acks = 1;
+SYSCTL_INT(_net_inet_tcp, OID_AUTO, ack_prioritize, CTLFLAG_RW | CTLFLAG_LOCKED,
+ &tcp_prioritize_acks, 1, "Prioritize pure acks");
+
static int32_t packchain_newlist = 0;
static int32_t packchain_looped = 0;
static int32_t packchain_sent = 0;
extern u_int32_t dlil_filter_count;
extern u_int32_t kipf_count;
extern int tcp_recv_bg;
+extern int maxseg_unacked;
static int tcp_ip_output(struct socket *, struct tcpcb *, struct mbuf *, int,
- struct mbuf *, int, int, int32_t);
+ struct mbuf *, int, int, int32_t, boolean_t);
-static inline int is_tcp_recv_bg(struct socket *so);
+extern uint32_t get_base_rtt(struct tcpcb *tp);
+static struct mbuf* tcp_send_lroacks(struct tcpcb *tp, struct mbuf *m, struct tcphdr *th);
static __inline__ u_int16_t
get_socket_id(struct socket * s)
return (val);
}
-static inline int
-is_tcp_recv_bg(struct socket *so)
-{
- return (so->so_traffic_mgt_flags & TRAFFIC_MGT_TCP_RECVBG);
-}
-
/*
* Tcp output routine: figure out what should be sent and send it.
*
* 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 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);
int so_options = so->so_options;
struct rtentry *rt;
+ u_int32_t basertt, svc_flags = 0;
+ u_int32_t lro_ackmore = (tp->t_lropktlen != 0) ? 1 : 0;
+ struct mbuf *mnext = NULL;
+ int sackoptlen = 0;
/*
* 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 (idle && idle_time >= TCP_IDLETIMEOUT(tp)) {
if (CC_ALGO(tp)->after_idle != NULL)
CC_ALGO(tp)->after_idle(tp);
DTRACE_TCP5(cc, void, NULL, struct inpcb *, tp->t_inpcb,
#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
+ } else
#endif
{
(((tp->t_inpcb->inp_laddr.s_addr & 0xffff) << 16) |
(tp->t_inpcb->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
if (rt != NULL && (!(rt->rt_flags & RTF_UP) ||
rt->generation_id != route_generation)) {
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;
+ if (isipv6) {
+ ia6 = ifa_foraddr6(&tp->t_inpcb->in6p_laddr);
+ if (ia6 != NULL)
+ found_srcaddr = 1;
+ } else {
+ ia = ifa_foraddr(tp->t_inpcb->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(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
tp->t_flags |= TF_PMTUD;
RT_UNLOCK(rt);
- }
}
/*
/* Can rexmit part of the current hole */
len = ((int32_t)min(cwin,
tp->snd_recover - p->rxmit));
- } else
+ } 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 */
sack_rxmit = 1;
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);
+ 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));
+ 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:
/*
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) {
+ while (tp->t_inpcb->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)), 0);
+ (so_options & SO_DONTROUTE),
+ (sack_rxmit | (sack_bytes_rxmt != 0)), 0,
+#ifdef INET6
+ isipv6);
+#else
+ 0);
+#endif
+
- 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) {
+ /*
+ * tcp was closed while we were in ip,
+ * resume close
+ */
+ if (tp->t_inpcb->inp_sndinprog_cnt == 0 &&
+ (tp->t_flags & TF_CLOSING)) {
tp->t_flags &= ~TF_CLOSING;
(void) tcp_close(tp);
} else {
}
KERNEL_DEBUG(DBG_FNC_TCP_OUTPUT | DBG_FUNC_END,
0,0,0,0,0);
- return 0;
+ return(0);
}
}
}
}
+ /* 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.
+ */
+ basertt = get_base_rtt(tp);
+ if (tcp_do_autosendbuf == 1 &&
+ !INP_WAIT_FOR_IF_FEEDBACK(tp->t_inpcb) && !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))) {
+ /* Also increase the send buffer only if the
+ * round-trip time is not increasing because we do
+ * not want to contribute to latency by filling buffers.
+ * We also do not want to hold onto application's
+ * old data for too long. Interactive applications would
+ * rather discard old data.
+ */
+ if (tp->t_rttcur <=
+ (basertt + 25)) {
+ 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;
+ }
+ } else {
+ so->so_snd.sb_idealsize =
+ max(tcp_sendspace, so->so_snd.sb_hiwat -
+ (2 * tcp_autosndbuf_inc));
+ so->so_snd.sb_flags |= SB_TRIM;
+ }
+ }
+ }
+
/*
* Truncate to the maximum segment length or enable TCP Segmentation
* Offloading (if supported by hardware) and ensure that FIN is removed
* 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;
- 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;
- goto send;
- }
if (tp->t_force) {
tp->t_flags &= ~TF_MAXSEGSNT;
goto send;
}
- if (len >= tp->max_sndwnd / 2 && tp->max_sndwnd > 0) {
- tp->t_flags &= ~TF_MAXSEGSNT;
- goto send;
- }
if (SEQ_LT(tp->snd_nxt, tp->snd_max)) {
tp->t_flags &= ~TF_MAXSEGSNT;
goto send;
}
if (sack_rxmit)
goto send;
+
+ /*
+ * Send new data on the connection only if it is
+ * not flow controlled
+ */
+ if (!INP_WAIT_FOR_IF_FEEDBACK(tp->t_inpcb) ||
+ tp->t_state != TCPS_ESTABLISHED) {
+ if (len >= tp->t_maxseg) {
+ tp->t_flags |= TF_MAXSEGSNT;
+ 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;
+ goto send;
+ }
+ if (len >= tp->max_sndwnd / 2 && tp->max_sndwnd > 0) {
+ tp->t_flags &= ~TF_MAXSEGSNT;
+ goto send;
+ }
+ } else {
+ tcpstat.tcps_fcholdpacket++;
+ }
}
/*
* 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
+ * max size segments, or at least 25% 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.
*/
(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
+ /* 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 ((tp->last_ack_sent != tp->rcv_nxt) || (((recwin + adv) >> tp->rcv_scale) > recwin))
+ if ((tp->t_flags & TF_STRETCHACK) == 0 &&
+ (tp->last_ack_sent != tp->rcv_nxt ||
+ ((recwin + adv) >> tp->rcv_scale) > recwin)) {
goto send;
+ }
+
+ /* Make sure that the delayed ack timer is set if we
+ * delayed sending a window update because of streaming
+ * detection.
+ */
+ if ((tp->t_flags & TF_STRETCHACK) != 0 &&
+ (tp->t_flags & TF_DELACK) == 0) {
+ 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)
+ if (4 * adv >= (int32_t) so->so_rcv.sb_hiwat)
goto send;
}
* 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 (tp->sack_enable && (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 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 (tp->t_inpcb->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;
+ tp_inp_options, (so_options & SO_DONTROUTE),
+ (sack_rxmit | (sack_bytes_rxmt != 0)), recwin,
+#ifdef INET6
+ isipv6);
+#else
+ 0);
+#endif
}
/* tcp was closed while we were in ip; resume close */
- if ((tp->t_flags & (TF_CLOSING|TF_SENDINPROG)) == TF_CLOSING) {
+ if (tp->t_inpcb->inp_sndinprog_cnt == 0 &&
+ (tp->t_flags & TF_CLOSING)) {
tp->t_flags &= ~TF_CLOSING;
(void) tcp_close(tp);
} else {
hdrlen = sizeof (struct ip6_hdr) + sizeof (struct tcphdr);
else
#endif
- hdrlen = sizeof (struct tcpiphdr);
+ 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 |
* 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)) {
+ !SEQ_LT(tp->snd_nxt, tp->snd_max) && !sack_rxmit) {
flags |= TH_CWR;
tp->ecn_flags &= ~TE_SENDCWR;
}
(flags & TH_RST) == 0 &&
((flags & TH_ACK) == 0 ||
(tp->t_flags & TF_RCVD_TSTMP))) {
- u_int32_t *lp = (u_int32_t *)(opt + optlen);
+ 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);
optlen += TCPOLEN_TSTAMP_APPA;
}
+ /* Note the timestamp for receive buffer autosizing */
+ if (tp->rfbuf_ts == 0 && (so->so_rcv.sb_flags & SB_AUTOSIZE))
+ tp->rfbuf_ts = tcp_now;
+
if (tp->sack_enable && ((tp->t_flags & TF_NOOPT) == 0)) {
/*
* Tack on the SACK permitted option *last*.
if (TCPS_HAVEESTABLISHED(tp->t_state) &&
(tp->t_flags & TF_SACK_PERMIT) && tp->rcv_numsacks > 0 &&
MAX_TCPOPTLEN - optlen - 2 >= TCPOLEN_SACK) {
- int nsack, sackoptlen, padlen;
+ int nsack, padlen;
u_char *bp = (u_char *)opt + optlen;
u_int32_t *lp;
tcpstat.tcps_sack_send_blocks++;
*bp++ = TCPOPT_SACK;
*bp++ = sackoptlen;
- lp = (u_int32_t *)bp;
+ lp = (u_int32_t *)(void *)bp;
for (i = 0; i < nsack; i++) {
struct sackblk sack = tp->sackblks[i];
*lp++ = htonl(sack.start);
#endif
/*#endif*/
+ /* Check if there is enough data in the send socket
+ * buffer to start measuring bw
+ */
+ if ((tp->t_flagsext & TF_MEASURESNDBW) != 0 &&
+ (tp->t_bwmeas != NULL) &&
+ (tp->t_flagsext & TF_BWMEAS_INPROGRESS) == 0 &&
+ (so->so_snd.sb_cc - (tp->snd_max - tp->snd_una)) >=
+ tp->t_bwmeas->bw_minsize) {
+ tp->t_bwmeas->bw_size = min((so->so_snd.sb_cc - (tp->snd_max - tp->snd_una)),
+ tp->t_bwmeas->bw_maxsize);
+ tp->t_flagsext |= TF_BWMEAS_INPROGRESS;
+ tp->t_bwmeas->bw_start = tp->snd_max;
+ tp->t_bwmeas->bw_ts = tcp_now;
+ }
+
+ VERIFY(tp->t_inpcb->inp_flowhash != 0);
+
/*
* Grab a header mbuf, attaching a copy of data to
* be transmitted, and initialize the header from
MH_ALIGN(m, hdrlen);
} else
#endif
- m->m_data += max_linkhdr;
+ m->m_data += max_linkhdr;
m->m_len = hdrlen;
}
m->m_pkthdr.rcvif = 0;
#if INET6
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);
}
+ svc_flags |= PKT_SCF_IPV6;
} else
#endif /* INET6 */
{
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)) {
+ !SEQ_LT(tp->snd_nxt, tp->snd_max) && !sack_rxmit) {
ip->ip_tos = IPTOS_ECN_ECT0;
}
}
* 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 &&
+ if (flags & TH_FIN && (tp->t_flags & TF_SENTFIN) &&
tp->snd_nxt == tp->snd_max)
tp->snd_nxt--;
/*
}
#if TRAFFIC_MGT
- if (tcp_recv_bg == 1 || is_tcp_recv_bg(so)) {
+ 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 ||
* to handle ttl and tos; we could keep them in
* the template, but need a way to checksum without them.
*/
+#ifdef INET6
/*
* 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.
: 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;
+ 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 /* 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);
+ {
+ 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);
+ }
/*
* 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 (path_mtu_discovery && (tp->t_flags & TF_PMTUD))
- ip->ip_off |= IP_DF;
+#ifdef INET6
+ if (!isipv6)
+#endif
+ if (path_mtu_discovery && (tp->t_flags & TF_PMTUD))
+ ip->ip_off |= IP_DF;
#if IPSEC
if (ipsec_bypass == 0)
*/
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.m_flowhash = tp->t_inpcb->inp_flowhash;
+ m->m_pkthdr.m_fhflags |=
+ (PF_TAG_TCP | PF_TAG_FLOWHASH | PF_TAG_FLOWADV);
+
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 (tp->t_inpcb->inp_last_outifp != NULL &&
+ tp->t_inpcb->inp_last_outifp != lo_ifp) {
+ /* 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 (tcp_prioritize_acks != 0 && len == 0 &&
+ (tp->t_inpcb->inp_last_outifp->if_eflags &
+ (IFEF_TXSTART | IFEF_NOACKPRI)) == IFEF_TXSTART &&
+ th->th_flags == TH_ACK && tp->snd_una == tp->snd_max &&
+ tp->t_timer[TCPT_REXMT] == 0) {
+ svc_flags |= PKT_SCF_TCP_ACK;
+ }
+ set_packet_service_class(m, so, MBUF_SC_UNSPEC, svc_flags);
+ }
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);
+#ifdef INET6
+ if (isipv6) {
+ DTRACE_TCP5(send, struct mbuf *, m, struct inpcb *, tp->t_inpcb,
+ struct ip6 *, ip6, struct tcpcb *, tp, struct tcphdr *,
+ th);
+ } else
+#endif
+ {
+ DTRACE_TCP5(send, struct mbuf *, m, struct inpcb *, tp->t_inpcb,
+ 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_head = tp->t_pktlist_tail = m;
}
+ if ((lro_ackmore) && (!sackoptlen) && (!tp->t_timer[TCPT_PERSIST]) &&
+ ((th->th_flags & TH_ACK) == TH_ACK) && (!len) &&
+ (tp->t_state == TCPS_ESTABLISHED)) {
+ /* For a pure ACK, see if you need to send more of them */
+ mnext = tcp_send_lroacks(tp, m, th);
+ if (mnext) {
+ tp->t_pktlist_tail->m_nextpkt = mnext;
+ if (mnext->m_nextpkt == NULL) {
+ tp->t_pktlist_tail = mnext;
+ tp->t_lastchain++;
+ } else {
+ struct mbuf *tail, *next;
+ next = mnext->m_nextpkt;
+ tail = next->m_nextpkt;
+ while (tail) {
+ next = tail;
+ tail = tail->m_nextpkt;
+ tp->t_lastchain++;
+ }
+ tp->t_pktlist_tail = next;
+ }
+ }
+ }
+
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) {
error = 0;
- while (!(tp->t_flags & TF_SENDINPROG) &&
- tp->t_pktlist_head != NULL) {
+ while (tp->t_inpcb->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);
+ (so_options & SO_DONTROUTE),
+ (sack_rxmit | (sack_bytes_rxmt != 0)), recwin,
+#ifdef INET6
+ isipv6);
+#else
+ 0);
+#endif
- tp->t_flags &= ~TF_SENDINPROG;
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 (tp->t_inpcb->inp_sndinprog_cnt == 0 &&
+ (tp->t_flags & TF_CLOSING)) {
tp->t_flags &= ~TF_CLOSING;
(void) tcp_close(tp);
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
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);
+ !tp->t_timer[TCPT_PERSIST])
+ tp->t_timer[TCPT_REXMT] =
+ OFFSET_FROM_START(tp, tp->t_rxtcur);
tp->snd_cwnd = tp->t_maxseg;
tp->t_bytes_acked = 0;
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)
goto again;
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, int recwin,
+ boolean_t isipv6)
{
int error = 0;
boolean_t chain;
boolean_t unlocked = FALSE;
struct inpcb *inp = tp->t_inpcb;
- struct ip_out_args ipoa;
+ struct ip_out_args ipoa =
+ { IFSCOPE_NONE, { 0 }, IPOAF_SELECT_SRCIF | IPOAF_BOUND_SRCADDR };
struct route ro;
- unsigned int outif;
+ struct ifnet *outif = NULL;
+#ifdef INET6
+ struct ip6_out_args ip6oa =
+ { IFSCOPE_NONE, { 0 }, IP6OAF_SELECT_SRCIF | IP6OAF_BOUND_SRCADDR };
+ struct route_in6 ro6;
+ struct flowadv *adv =
+ (isipv6 ? &ip6oa.ip6oa_flowadv : &ipoa.ipoa_flowadv);
+#else
+ struct flowadv *adv = &ipoa.ipoa_flowadv;
+#endif /* !INET6 */
/* 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) {
+#ifdef INET6
+ if (isipv6) {
+ ip6oa.ip6oa_boundif = inp->inp_boundifp->if_index;
+ ip6oa.ip6oa_flags |= IP6OAF_BOUND_IF;
+ } else
+#endif
+ {
+ ipoa.ipoa_boundif = inp->inp_boundifp->if_index;
+ ipoa.ipoa_flags |= IPOAF_BOUND_IF;
+ }
+ }
+
+ if (inp->inp_flags & INP_NO_IFT_CELLULAR) {
+#ifdef INET6
+ if (isipv6)
+ ip6oa.ip6oa_flags |= IP6OAF_NO_CELLULAR;
+ else
+#endif
+ ipoa.ipoa_flags |= IPOAF_NO_CELLULAR;
+ }
+#ifdef INET6
+ if (isipv6)
+ flags |= IPV6_OUTARGS;
+ else
+#endif
+ flags |= IP_OUTARGS;
/* Copy the cached route and take an extra reference */
- inp_route_copyout(inp, &ro);
+#ifdef INET6
+ if (isipv6)
+ in6p_route_copyout(inp, &ro6);
+ else
+#endif
+ inp_route_copyout(inp, &ro);
/*
* Data sent (as far as we can tell).
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)) {
+
unlocked = TRUE;
socket_unlock(so, 0);
}
*/
cnt = 0;
}
- error = ip_output_list(pkt, cnt, opt, &ro, flags, 0, &ipoa);
+#ifdef INET6
+ if (isipv6)
+ error = ip6_output_list(pkt, cnt,
+ inp->in6p_outputopts, &ro6, flags, NULL, NULL,
+ &ip6oa);
+ else
+#endif
+ error = ip_output_list(pkt, cnt, opt, &ro, flags, NULL,
+ &ipoa);
+
if (chain || error) {
/*
* If we sent down a chain then we are done since
if (unlocked)
socket_lock(so, 0);
- if (ro.ro_rt != NULL &&
- (outif = ro.ro_rt->rt_ifp->if_index) != inp->inp_last_outif)
- inp->inp_last_outif = outif;
+ /*
+ * Enter flow controlled state if the connection is established
+ * and is not in recovery.
+ *
+ * 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) {
+ int rc;
+ rc = inp_set_fc_state(inp, adv->code);
+
+ if (rc == 1)
+ DTRACE_TCP5(cc, void, NULL, struct inpcb *, inp,
+ struct tcpcb *, tp, struct tcphdr *, NULL,
+ int32_t, ((adv->code == FADV_FLOW_CONTROLLED) ?
+ TCP_CC_FLOW_CONTROL : TCP_CC_SUSPEND));
+ }
- /* Synchronize cached PCB route */
- inp_route_copyin(inp, &ro);
+ /*
+ * 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);
+#ifdef INET6
+ if (isipv6) {
+ if (ro6.ro_rt != NULL && (outif = ro6.ro_rt->rt_ifp) !=
+ inp->in6p_last_outifp)
+ inp->in6p_last_outifp = outif;
+ } else
+#endif
+ if (ro.ro_rt != NULL && (outif = ro.ro_rt->rt_ifp) !=
+ inp->inp_last_outifp)
+ inp->inp_last_outifp = outif;
+
+ if ((inp->inp_flags & INP_NO_IFT_CELLULAR) && outif != NULL &&
+ outif->if_type == IFT_CELLULAR)
+ soevent(inp->inp_socket,
+ (SO_FILT_HINT_LOCKED|SO_FILT_HINT_IFDENIED));
+
+ /* Synchronize cached PCB route & options */
+#ifdef INET6
+ if (isipv6)
+ in6p_route_copyin(inp, &ro6);
+ else
+#endif
+ inp_route_copyin(inp, &ro);
+
+ 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);
}
*/
TCPT_RANGESET(tp->t_timer[TCPT_PERSIST],
t * tcp_backoff[tp->t_rxtshift],
- TCPTV_PERSMIN, TCPTV_PERSMAX,
- TCP_ADD_REXMTSLOP(tp));
+ TCPTV_PERSMIN, 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++;
}
+
+/*
+ * Send as many acks as data coalesced. Every other packet when stretch
+ * ACK is not enabled. Every 8 packets, if stretch ACK is enabled.
+ */
+static struct mbuf*
+tcp_send_lroacks(struct tcpcb *tp, struct mbuf *m, struct tcphdr *th)
+{
+ struct mbuf *mnext = NULL, *ack_chain = NULL, *tail = NULL;
+ int count = 0;
+ tcp_seq org_ack = ntohl(th->th_ack);
+ tcp_seq prev_ack = 0;
+ int tack_offset = 28; /* XXX IPv6 not supported */
+ int ack_size = (tp->t_flags & TF_STRETCHACK) ?
+ (maxseg_unacked * tp->t_maxseg) : (tp->t_maxseg << 1);
+ int segs_acked = (tp->t_flags & TF_STRETCHACK) ? maxseg_unacked : 2;
+ struct mbuf *prev_ack_pkt = NULL;
+ struct socket *so = tp->t_inpcb->inp_socket;
+
+ count = tp->t_lropktlen/tp->t_maxseg;
+
+ prev_ack = (org_ack - tp->t_lropktlen) + ack_size;
+ if (prev_ack < org_ack) {
+ ack_chain = m_dup(m, M_DONTWAIT);
+ if (ack_chain) {
+ th->th_ack = htonl(prev_ack);
+ tail = ack_chain;
+ count -= segs_acked; /* accounts for prev_ack packet */
+ count = (count <= segs_acked) ? 0 : count - segs_acked;
+ tcpstat.tcps_sndacks++;
+ so_tc_update_stats(m, so, m_get_service_class(m));
+ } else {
+ return NULL;
+ }
+ }
+ else {
+ tp->t_lropktlen = 0;
+ return NULL;
+ }
+
+ prev_ack_pkt = ack_chain;
+
+ while (count > 0) {
+ if ((prev_ack + ack_size) < org_ack) {
+ prev_ack += ack_size;
+ } else {
+ /*
+ * The last ACK sent must have the ACK number that TCP
+ * thinks is the last sent ACK number.
+ */
+ prev_ack = org_ack;
+ }
+ mnext = m_dup(prev_ack_pkt, M_DONTWAIT);
+ if (mnext) {
+ HTONL(prev_ack);
+ bcopy(&prev_ack, mtod(prev_ack_pkt, caddr_t) + tack_offset, 4);
+ NTOHL(prev_ack);
+ tail->m_nextpkt = mnext;
+ tail = mnext;
+ count -= segs_acked;
+ tcpstat.tcps_sndacks++;
+ so_tc_update_stats(m, so, m_get_service_class(m));
+ if (lrodebug == 5) {
+ printf("%s: lropktlen = %d count = %d, th_ack = %x \n",
+ __func__, tp->t_lropktlen, count,
+ th->th_ack);
+ }
+ } else {
+ if (lrodebug == 5) {
+ printf("%s: failed to alloc mbuf.\n", __func__);
+ }
+ break;
+ }
+ prev_ack_pkt = mnext;
+ }
+ tp->t_lropktlen = 0;
+ return ack_chain;
+}
projects / apple / xnu.git / blobdiff