/*
- * Copyright (c) 2000-2014 Apple Inc. All rights reserved.
+ * Copyright (c) 2000-2015 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
#include <netinet/tcp_timer.h>
#include <netinet/tcp_var.h>
#include <netinet/tcp_cc.h>
+#include <netinet/tcp_cache.h>
#include <kern/thread_call.h>
#if INET6
#include <security/mac_framework.h>
#endif /* MAC_NET */
+#include <corecrypto/ccaes.h>
+#include <libkern/crypto/aes.h>
#include <libkern/crypto/md5.h>
#include <sys/kdebug.h>
#include <mach/sdt.h>
extern int tcp_do_autorcvbuf;
+int tcp_sysctl_fastopenkey(struct sysctl_oid *, void *, int ,
+ struct sysctl_req *);
+SYSCTL_PROC(_net_inet_tcp, OID_AUTO, fastopen_key,
+ CTLTYPE_STRING | CTLFLAG_WR,
+ 0 , 0, tcp_sysctl_fastopenkey, "S", "TCP Fastopen key");
+
+/* Current count of half-open TFO connections */
+int tcp_tfo_halfcnt = 0;
+
+/* Maximum of half-open TFO connection backlog */
+int tcp_tfo_backlog = 10;
+SYSCTL_INT(_net_inet_tcp, OID_AUTO, fastopen_backlog, CTLFLAG_RW | CTLFLAG_LOCKED,
+ &tcp_tfo_backlog, 0, "Backlog queue for half-open TFO connections");
+
+int tcp_fastopen = TCP_FASTOPEN_CLIENT | TCP_FASTOPEN_SERVER;
+SYSCTL_INT(_net_inet_tcp, OID_AUTO, fastopen, CTLFLAG_RW | CTLFLAG_LOCKED,
+ &tcp_fastopen, 0, "Enable TCP Fastopen (RFC 7413)");
+
+int tcp_tfo_fallback_min = 10;
+SYSCTL_INT(_net_inet_tcp, OID_AUTO, fastopen_fallback_min, CTLFLAG_RW | CTLFLAG_LOCKED,
+ &tcp_tfo_fallback_min, 0, "Mininum number of trials without TFO when in fallback mode");
+
/*
* Minimum MSS we accept and use. This prevents DoS attacks where
* we are forced to a ridiculous low MSS like 20 and send hundreds
int tcp_minmss = TCP_MINMSS;
SYSCTL_INT(_net_inet_tcp, OID_AUTO, minmss, CTLFLAG_RW | CTLFLAG_LOCKED,
&tcp_minmss , 0, "Minmum TCP Maximum Segment Size");
-
-static int tcp_do_rfc1323 = 1;
-SYSCTL_INT(_net_inet_tcp, TCPCTL_DO_RFC1323, rfc1323, CTLFLAG_RW | CTLFLAG_LOCKED,
- &tcp_do_rfc1323 , 0, "Enable rfc1323 (high performance TCP) extensions");
+int tcp_do_rfc1323 = 1;
+#if (DEVELOPMENT || DEBUG)
+SYSCTL_INT(_net_inet_tcp, TCPCTL_DO_RFC1323, rfc1323,
+ CTLFLAG_RW | CTLFLAG_LOCKED, &tcp_do_rfc1323 , 0,
+ "Enable rfc1323 (high performance TCP) extensions");
+#endif /* (DEVELOPMENT || DEBUG) */
// Not used
static int tcp_do_rfc1644 = 0;
"Certain ICMP unreachable messages may abort connections in SYN_SENT");
static int tcp_strict_rfc1948 = 0;
-SYSCTL_INT(_net_inet_tcp, OID_AUTO, strict_rfc1948, CTLFLAG_RW | CTLFLAG_LOCKED,
+static int tcp_isn_reseed_interval = 0;
+#if (DEVELOPMENT || DEBUG)
+SYSCTL_INT(_net_inet_tcp, OID_AUTO, strict_rfc1948,
+ CTLFLAG_RW | CTLFLAG_LOCKED,
&tcp_strict_rfc1948, 0, "Determines if RFC1948 is followed exactly");
-static int tcp_isn_reseed_interval = 0;
-SYSCTL_INT(_net_inet_tcp, OID_AUTO, isn_reseed_interval, CTLFLAG_RW | CTLFLAG_LOCKED,
+SYSCTL_INT(_net_inet_tcp, OID_AUTO, isn_reseed_interval,
+ CTLFLAG_RW | CTLFLAG_LOCKED,
&tcp_isn_reseed_interval, 0, "Seconds between reseeding of ISN secret");
-static int tcp_background_io_enabled = 1;
-SYSCTL_INT(_net_inet_tcp, OID_AUTO, background_io_enabled, CTLFLAG_RW | CTLFLAG_LOCKED,
- &tcp_background_io_enabled, 0, "Background IO Enabled");
+#endif /* (DEVELOPMENT || DEBUG) */
int tcp_TCPTV_MIN = 100; /* 100ms minimum RTT */
SYSCTL_INT(_net_inet_tcp, OID_AUTO, rtt_min, CTLFLAG_RW | CTLFLAG_LOCKED,
&tcp_use_randomport, 0, "Randomize TCP port numbers");
__private_extern__ int tcp_win_scale = 3;
-SYSCTL_INT(_net_inet_tcp, OID_AUTO, win_scale_factor, CTLFLAG_RW | CTLFLAG_LOCKED,
+SYSCTL_INT(_net_inet_tcp, OID_AUTO, win_scale_factor,
+ CTLFLAG_RW | CTLFLAG_LOCKED,
&tcp_win_scale, 0, "Window scaling factor");
static void tcp_cleartaocache(void);
struct zone *sack_hole_zone;
struct zone *tcp_reass_zone;
struct zone *tcp_bwmeas_zone;
+struct zone *tcp_rxt_seg_zone;
extern int slowlink_wsize; /* window correction for slow links */
extern int path_mtu_discovery;
static lck_grp_attr_t *tcp_uptime_mtx_grp_attr = NULL; /* mutex group attributes */
int tcp_notsent_lowat_check(struct socket *so);
+static aes_encrypt_ctx tfo_ctx; /* Crypto-context for TFO */
+
+void
+tcp_tfo_gen_cookie(struct inpcb *inp, u_char *out, size_t blk_size)
+{
+ u_char in[CCAES_BLOCK_SIZE];
+#if INET6
+ int isipv6 = inp->inp_vflag & INP_IPV6;
+#endif
+
+ VERIFY(blk_size == CCAES_BLOCK_SIZE);
+
+ bzero(&in[0], CCAES_BLOCK_SIZE);
+ bzero(&out[0], CCAES_BLOCK_SIZE);
+
+#if INET6
+ if (isipv6)
+ memcpy(in, &inp->in6p_faddr, sizeof(struct in6_addr));
+ else
+#endif /* INET6 */
+ memcpy(in, &inp->inp_faddr, sizeof(struct in_addr));
+
+ aes_encrypt_cbc(in, NULL, 1, out, &tfo_ctx);
+}
+
+__private_extern__ int
+tcp_sysctl_fastopenkey(__unused struct sysctl_oid *oidp, __unused void *arg1,
+ __unused int arg2, struct sysctl_req *req)
+{
+ int error = 0;
+ /* TFO-key is expressed as a string in hex format (+1 to account for \0 char) */
+ char keystring[TCP_FASTOPEN_KEYLEN * 2 + 1];
+ u_int32_t key[TCP_FASTOPEN_KEYLEN / sizeof(u_int32_t)];
+ int i;
+
+ /* -1, because newlen is len without the terminating \0 character */
+ if (req->newlen != (sizeof(keystring) - 1)) {
+ error = EINVAL;
+ goto exit;
+ }
+
+ /* sysctl_io_string copies keystring into the oldptr of the sysctl_req.
+ * Make sure everything is zero, to avoid putting garbage in there or
+ * leaking the stack.
+ */
+ bzero(keystring, sizeof(keystring));
+
+ error = sysctl_io_string(req, keystring, sizeof(keystring), 0, NULL);
+ if (error)
+ goto exit;
+
+ for (i = 0; i < (TCP_FASTOPEN_KEYLEN / sizeof(u_int32_t)); i++) {
+ /* We jump over the keystring in 8-character (4 byte in hex) steps */
+ if (sscanf(&keystring[i * 8], "%8x", &key[i]) != 1) {
+ error = EINVAL;
+ goto exit;
+ }
+ }
+
+ aes_encrypt_key128((u_char *)key, &tfo_ctx);
+
+exit:
+ return (error);
+}
+
int get_inpcb_str_size(void)
{
return sizeof(struct inpcb);
return ret;
}
+static void
+tcp_tfo_init()
+{
+ u_char key[TCP_FASTOPEN_KEYLEN];
+
+ read_random(key, sizeof(key));
+ aes_encrypt_key128(key, &tfo_ctx);
+}
+
/*
* Tcp initialization
*/
read_random(&tcp_now, sizeof(tcp_now));
tcp_now = tcp_now & 0x3fffffff; /* Starts tcp internal clock at a random value */
+ tcp_tfo_init();
+
LIST_INIT(&tcb);
tcbinfo.ipi_listhead = &tcb;
zone_change(tcbinfo.ipi_zone, Z_EXPAND, TRUE);
tcbinfo.ipi_gc = tcp_gc;
+ tcbinfo.ipi_timer = tcp_itimer;
in_pcbinfo_attach(&tcbinfo);
str_size = P2ROUNDUP(sizeof(struct sackhole), sizeof(u_int64_t));
zone_change(tcp_cc_zone, Z_CALLERACCT, FALSE);
zone_change(tcp_cc_zone, Z_EXPAND, TRUE);
+ str_size = P2ROUNDUP(sizeof(struct tcp_rxt_seg), sizeof(u_int64_t));
+ tcp_rxt_seg_zone = zinit(str_size, 10000 * str_size, 0,
+ "tcp_rxt_seg_zone");
+ zone_change(tcp_rxt_seg_zone, Z_CALLERACCT, FALSE);
+ zone_change(tcp_rxt_seg_zone, Z_EXPAND, TRUE);
+
#if INET6
#define TCP_MINPROTOHDR (sizeof(struct ip6_hdr) + sizeof(struct tcphdr))
#else /* INET6 */
/* Initialize TCP LRO data structures */
tcp_lro_init();
+ /* Initialize TCP Cache */
+ tcp_cache_init();
+
/*
* If more than 60 MB of mbuf pool is available, increase the
* maximum allowed receive and send socket buffer size.
#endif
#if NECP
- necp_mark_packet_from_socket(m, tp ? tp->t_inpcb : NULL, 0);
+ necp_mark_packet_from_socket(m, tp ? tp->t_inpcb : NULL, 0, 0);
#endif /* NECP */
-
+
#if IPSEC
if (tp != NULL && tp->t_inpcb->inp_sp != NULL &&
ipsec_setsocket(m, tp ? tp->t_inpcb->inp_socket : NULL) != 0) {
calculate_tcp_clock();
- if (!so->cached_in_sock_layer) {
+ if ((so->so_flags1 & SOF1_CACHED_IN_SOCK_LAYER) == 0) {
it = (struct inp_tp *)(void *)inp;
tp = &it->tcb;
} else {
tp->t_flagsext |= TF_SACK_ENABLE;
TAILQ_INIT(&tp->snd_holes);
+ SLIST_INIT(&tp->t_rxt_segments);
tp->t_inpcb = inp; /* XXX */
/*
* Init srtt to TCPTV_SRTTBASE (0), so we can tell that we have no
}
}
+static inline void
+tcp_update_ecn_perf_stats(struct tcpcb *tp,
+ struct if_tcp_ecn_perf_stat *stat)
+{
+ u_int64_t curval, oldval;
+ struct inpcb *inp = tp->t_inpcb;
+ stat->total_txpkts += inp->inp_stat->txpackets;
+ stat->total_rxpkts += inp->inp_stat->rxpackets;
+ stat->total_rxmitpkts += tp->t_stat.rxmitpkts;
+ stat->total_oopkts += tp->t_rcvoopack;
+ stat->total_reorderpkts += (tp->t_reordered_pkts + tp->t_pawsdrop +
+ tp->t_dsack_sent + tp->t_dsack_recvd);
+
+ /* Average RTT */
+ curval = (tp->t_srtt >> TCP_RTT_SHIFT);
+ if (curval > 0 && tp->t_rttupdated >= 16) {
+ if (stat->rtt_avg == 0) {
+ stat->rtt_avg = curval;
+ } else {
+ oldval = stat->rtt_avg;
+ stat->rtt_avg =
+ ((oldval << 4) - oldval + curval) >> 4;
+ }
+ }
+
+ /* RTT variance */
+ curval = tp->t_rttvar >> TCP_RTTVAR_SHIFT;
+ if (curval > 0 && tp->t_rttupdated >= 16) {
+ if (stat->rtt_var == 0) {
+ stat->rtt_var = curval;
+ } else {
+ oldval = stat->rtt_var;
+ stat->rtt_var =
+ ((oldval << 4) - oldval + curval) >> 4;
+ }
+ }
+
+ /* Total number of SACK recovery episodes */
+ stat->sack_episodes += tp->t_sack_recovery_episode;
+
+ if (inp->inp_socket->so_error == ECONNRESET)
+ stat->rst_drop++;
+ return;
+}
+
/*
* Close a TCP control block:
* discard all space held by the tcp
/* free the reassembly queue, if any */
(void) tcp_freeq(tp);
+ /* Collect ECN related statistics */
+ if (tp->ecn_flags & TE_SETUPSENT) {
+ if (tp->ecn_flags & TE_CLIENT_SETUP) {
+ INP_INC_IFNET_STAT(inp, ecn_client_setup);
+ if (TCP_ECN_ENABLED(tp)) {
+ INP_INC_IFNET_STAT(inp,
+ ecn_client_success);
+ } else if (tp->ecn_flags & TE_LOST_SYN) {
+ INP_INC_IFNET_STAT(inp, ecn_syn_lost);
+ } else {
+ INP_INC_IFNET_STAT(inp,
+ ecn_peer_nosupport);
+ }
+ } else {
+ INP_INC_IFNET_STAT(inp, ecn_server_setup);
+ if (TCP_ECN_ENABLED(tp)) {
+ INP_INC_IFNET_STAT(inp,
+ ecn_server_success);
+ } else if (tp->ecn_flags & TE_LOST_SYNACK) {
+ INP_INC_IFNET_STAT(inp,
+ ecn_synack_lost);
+ } else {
+ INP_INC_IFNET_STAT(inp,
+ ecn_peer_nosupport);
+ }
+ }
+ } else {
+ INP_INC_IFNET_STAT(inp, ecn_off_conn);
+ }
+ if (TCP_ECN_ENABLED(tp)) {
+ if (tp->ecn_flags & TE_RECV_ECN_CE) {
+ tcpstat.tcps_ecn_conn_recv_ce++;
+ INP_INC_IFNET_STAT(inp, ecn_conn_recv_ce);
+ }
+ if (tp->ecn_flags & TE_RECV_ECN_ECE) {
+ tcpstat.tcps_ecn_conn_recv_ece++;
+ INP_INC_IFNET_STAT(inp, ecn_conn_recv_ece);
+ }
+ if (tp->ecn_flags & (TE_RECV_ECN_CE | TE_RECV_ECN_ECE)) {
+ if (tp->t_stat.txretransmitbytes > 0 ||
+ tp->t_stat.rxoutoforderbytes > 0) {
+ tcpstat.tcps_ecn_conn_pl_ce++;
+ INP_INC_IFNET_STAT(inp, ecn_conn_plce);
+ } else {
+ tcpstat.tcps_ecn_conn_nopl_ce++;
+ INP_INC_IFNET_STAT(inp, ecn_conn_noplce);
+ }
+ } else {
+ if (tp->t_stat.txretransmitbytes > 0 ||
+ tp->t_stat.rxoutoforderbytes > 0) {
+ tcpstat.tcps_ecn_conn_plnoce++;
+ INP_INC_IFNET_STAT(inp, ecn_conn_plnoce);
+ }
+ }
+ }
+
+ /* Aggregate performance stats */
+ if (inp->inp_last_outifp != NULL && !(tp->t_flags & TF_LOCAL)) {
+ struct ifnet *ifp = inp->inp_last_outifp;
+ ifnet_lock_shared(ifp);
+ if ((ifp->if_refflags & (IFRF_ATTACHED | IFRF_DETACHING)) ==
+ IFRF_ATTACHED) {
+ if (inp->inp_vflag & INP_IPV6) {
+ ifp->if_ipv6_stat->timestamp = net_uptime();
+ if (TCP_ECN_ENABLED(tp)) {
+ tcp_update_ecn_perf_stats(tp,
+ &ifp->if_ipv6_stat->ecn_on);
+ } else {
+ tcp_update_ecn_perf_stats(tp,
+ &ifp->if_ipv6_stat->ecn_off);
+ }
+ } else {
+ ifp->if_ipv4_stat->timestamp = net_uptime();
+ if (TCP_ECN_ENABLED(tp)) {
+ tcp_update_ecn_perf_stats(tp,
+ &ifp->if_ipv4_stat->ecn_on);
+ } else {
+ tcp_update_ecn_perf_stats(tp,
+ &ifp->if_ipv4_stat->ecn_off);
+ }
+ }
+ }
+ ifnet_lock_done(ifp);
+ }
+
tcp_free_sackholes(tp);
if (tp->t_bwmeas != NULL) {
tcp_bwmeas_free(tp);
}
-
+ tcp_rxtseg_clean(tp);
/* Free the packet list */
if (tp->t_pktlist_head != NULL)
m_freem_list(tp->t_pktlist_head);
tp->t_mptcb = NULL;
#endif /* MPTCP */
- if (so->cached_in_sock_layer)
+ if (so->so_flags1 & SOF1_CACHED_IN_SOCK_LAYER)
inp->inp_saved_ppcb = (caddr_t) tp;
tp->t_state = TCPS_CLOSED;
}
tp->tcp_cc_index = TCP_CC_ALGO_NONE;
+ /* Can happen if we close the socket before receiving the third ACK */
+ if ((tp->t_tfo_flags & TFO_F_COOKIE_VALID)) {
+ OSDecrementAtomic(&tcp_tfo_halfcnt);
+
+ /* Panic if something has gone terribly wrong. */
+ VERIFY(tcp_tfo_halfcnt >= 0);
+
+ tp->t_tfo_flags &= ~TFO_F_COOKIE_VALID;
+ }
+
#if INET6
if (SOCK_CHECK_DOM(so, PF_INET6))
in6_pcbdetach(inp);
return (rv);
}
+
+/*
+ * Walk the tcpbs, if existing, and flush the reassembly queue,
+ * if there is one when do_tcpdrain is enabled
+ * Also defunct the extended background idle socket
+ * Do it next time if the pcbinfo lock is in use
+ */
void
tcp_drain()
{
- if (do_tcpdrain)
- {
- struct inpcb *inp;
- struct tcpcb *tp;
- /*
- * Walk the tcpbs, if existing, and flush the reassembly queue,
- * if there is one...
- * Do it next time if the pcbinfo lock is in use
- */
- if (!lck_rw_try_lock_exclusive(tcbinfo.ipi_lock))
- return;
+ struct inpcb *inp;
+ struct tcpcb *tp;
- LIST_FOREACH(inp, tcbinfo.ipi_listhead, inp_list) {
- if (in_pcb_checkstate(inp, WNT_ACQUIRE, 0) !=
- WNT_STOPUSING) {
- tcp_lock(inp->inp_socket, 1, 0);
- if (in_pcb_checkstate(inp, WNT_RELEASE, 1)
- == WNT_STOPUSING) {
- /* lost a race, try the next one */
- tcp_unlock(inp->inp_socket, 1, 0);
- continue;
- }
- tp = intotcpcb(inp);
- tcp_freeq(tp);
+ if (!lck_rw_try_lock_exclusive(tcbinfo.ipi_lock))
+ return;
+
+ LIST_FOREACH(inp, tcbinfo.ipi_listhead, inp_list) {
+ if (in_pcb_checkstate(inp, WNT_ACQUIRE, 0) !=
+ WNT_STOPUSING) {
+ tcp_lock(inp->inp_socket, 1, 0);
+ if (in_pcb_checkstate(inp, WNT_RELEASE, 1)
+ == WNT_STOPUSING) {
+ /* lost a race, try the next one */
tcp_unlock(inp->inp_socket, 1, 0);
- }
- }
- lck_rw_done(tcbinfo.ipi_lock);
+ continue;
+ }
+ tp = intotcpcb(inp);
+
+ if (do_tcpdrain)
+ tcp_freeq(tp);
+
+ so_drain_extended_bk_idle(inp->inp_socket);
+ tcp_unlock(inp->inp_socket, 1, 0);
+ }
}
+ lck_rw_done(tcbinfo.ipi_lock);
+
}
/*
otp->ts_recent = tp->ts_recent;
otp->ts_recent_age = tp->ts_recent_age;
otp->last_ack_sent = tp->last_ack_sent;
- otp->cc_send = tp->cc_send;
- otp->cc_recv = tp->cc_recv;
+ otp->cc_send = 0;
+ otp->cc_recv = 0;
otp->snd_recover = tp->snd_recover;
otp->snd_cwnd_prev = tp->snd_cwnd_prev;
otp->snd_ssthresh_prev = tp->snd_ssthresh_prev;
otp->ts_recent = tp->ts_recent;
otp->ts_recent_age = tp->ts_recent_age;
otp->last_ack_sent = tp->last_ack_sent;
- otp->cc_send = tp->cc_send;
- otp->cc_recv = tp->cc_recv;
+ otp->cc_send = 0;
+ otp->cc_recv = 0;
otp->snd_recover = tp->snd_recover;
otp->snd_cwnd_prev = tp->snd_cwnd_prev;
otp->snd_ssthresh_prev = tp->snd_ssthresh_prev;
if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
return;
+ if ((unsigned)cmd >= PRC_NCMDS)
+ return;
+
if (cmd == PRC_MSGSIZE)
notify = tcp_mtudisc;
else if (icmp_may_rst && (cmd == PRC_UNREACH_ADMIN_PROHIB ||
/* Source quench is deprecated */
else if (cmd == PRC_QUENCH)
return;
- else if ((unsigned)cmd > PRC_NCMDS || inetctlerrmap[cmd] == 0)
+ else if (inetctlerrmap[cmd] == 0)
return;
if (ip) {
struct tcphdr th;
sa->sa_len != sizeof(struct sockaddr_in6))
return;
+ if ((unsigned)cmd >= PRC_NCMDS)
+ return;
+
if (cmd == PRC_MSGSIZE)
notify = tcp_mtudisc;
- else if (!PRC_IS_REDIRECT(cmd) &&
- ((unsigned)cmd > PRC_NCMDS || inet6ctlerrmap[cmd] == 0))
+ else if (!PRC_IS_REDIRECT(cmd) && (inet6ctlerrmap[cmd] == 0))
return;
/* Source quench is deprecated */
else if (cmd == PRC_QUENCH)
struct socket *so = inp->inp_socket;
int offered;
int mss;
+ u_int32_t mtu;
#if INET6
int isipv6 = (tp->t_inpcb->inp_vflag & INP_IPV6) != 0;
#endif /* INET6 */
}
taop = rmx_taop(rt->rt_rmx);
offered = taop->tao_mssopt;
- mss = rt->rt_rmx.rmx_mtu -
+ mtu = rt->rt_rmx.rmx_mtu;
+
+ /* Route locked during lookup above */
+ RT_UNLOCK(rt);
+
+#if NECP
+ // Adjust MTU if necessary.
+ mtu = necp_socket_get_effective_mtu(inp, mtu);
+#endif /* NECP */
+
+ mss = mtu -
#if INET6
(isipv6 ?
sizeof(struct ip6_hdr) + sizeof(struct tcphdr) :
#endif /* INET6 */
;
- /* Route locked during lookup above */
- RT_UNLOCK(rt);
-
if (offered)
mss = min(mss, offered);
/*
tcp_set_tso(tp, rt->rt_ifp);
soif2kcl(inp->inp_socket,
(rt->rt_ifp->if_eflags & IFEF_2KCL));
+ tcp_set_ecn(tp, rt->rt_ifp);
}
/* Note if the peer is local */
tcp_set_tso(tp, rt->rt_ifp);
soif2kcl(inp->inp_socket,
(rt->rt_ifp->if_eflags & IFEF_2KCL));
+ tcp_set_ecn(tp, rt->rt_ifp);
}
/* Note if the peer is local */
}
}
-/* Determine if we can grow the recieve socket buffer to avoid sending
+/*
+ * Determine if we can grow the recieve socket buffer to avoid sending
* a zero window update to the peer. We allow even socket buffers that
* have fixed size (set by the application) to grow if the resource
* constraints are met. They will also be trimmed after the application
* reads data.
*/
static void
-tcp_sbrcv_grow_rwin(struct tcpcb *tp, struct sockbuf *sb) {
+tcp_sbrcv_grow_rwin(struct tcpcb *tp, struct sockbuf *sb)
+{
u_int32_t rcvbufinc = tp->t_maxseg << 4;
u_int32_t rcvbuf = sb->sb_hiwat;
struct socket *so = tp->t_inpcb->inp_socket;
if (tcp_do_autorcvbuf == 1 &&
tcp_cansbgrow(sb) &&
(tp->t_flags & TF_SLOWLINK) == 0 &&
+ (so->so_flags1 & SOF1_EXTEND_BK_IDLE_WANTED) == 0 &&
(rcvbuf - sb->sb_cc) < rcvbufinc &&
rcvbuf < tcp_autorcvbuf_max &&
(sb->sb_idealsize > 0 &&
void
tcp_set_max_rwinscale(struct tcpcb *tp, struct socket *so) {
u_int32_t maxsockbufsize;
+ if (!tcp_do_rfc1323) {
+ tp->request_r_scale = 0;
+ return;
+ }
tp->request_r_scale = max(tcp_win_scale, tp->request_r_scale);
maxsockbufsize = ((so->so_rcv.sb_flags & SB_USRSIZE) != 0) ?
return(0);
}
+void
+tcp_rxtseg_insert(struct tcpcb *tp, tcp_seq start, tcp_seq end) {
+ struct tcp_rxt_seg *rxseg = NULL, *prev = NULL, *next = NULL;
+ u_int32_t rxcount = 0;
+
+ if (SLIST_EMPTY(&tp->t_rxt_segments))
+ tp->t_dsack_lastuna = tp->snd_una;
+ /*
+ * First check if there is a segment already existing for this
+ * sequence space.
+ */
+
+ SLIST_FOREACH(rxseg, &tp->t_rxt_segments, rx_link) {
+ if (SEQ_GT(rxseg->rx_start, start))
+ break;
+ prev = rxseg;
+ }
+ next = rxseg;
+
+ /* check if prev seg is for this sequence */
+ if (prev != NULL && SEQ_LEQ(prev->rx_start, start) &&
+ SEQ_GEQ(prev->rx_end, end)) {
+ prev->rx_count++;
+ return;
+ }
+
+ /*
+ * There are a couple of possibilities at this point.
+ * 1. prev overlaps with the beginning of this sequence
+ * 2. next overlaps with the end of this sequence
+ * 3. there is no overlap.
+ */
+
+ if (prev != NULL && SEQ_GT(prev->rx_end, start)) {
+ if (prev->rx_start == start && SEQ_GT(end, prev->rx_end)) {
+ start = prev->rx_end + 1;
+ prev->rx_count++;
+ } else {
+ prev->rx_end = (start - 1);
+ rxcount = prev->rx_count;
+ }
+ }
+
+ if (next != NULL && SEQ_LT(next->rx_start, end)) {
+ if (SEQ_LEQ(next->rx_end, end)) {
+ end = next->rx_start - 1;
+ next->rx_count++;
+ } else {
+ next->rx_start = end + 1;
+ rxcount = next->rx_count;
+ }
+ }
+ if (!SEQ_LT(start, end))
+ return;
+
+ rxseg = (struct tcp_rxt_seg *) zalloc(tcp_rxt_seg_zone);
+ if (rxseg == NULL) {
+ return;
+ }
+ bzero(rxseg, sizeof(*rxseg));
+ rxseg->rx_start = start;
+ rxseg->rx_end = end;
+ rxseg->rx_count = rxcount + 1;
+
+ if (prev != NULL) {
+ SLIST_INSERT_AFTER(prev, rxseg, rx_link);
+ } else {
+ SLIST_INSERT_HEAD(&tp->t_rxt_segments, rxseg, rx_link);
+ }
+ return;
+}
+
+struct tcp_rxt_seg *
+tcp_rxtseg_find(struct tcpcb *tp, tcp_seq start, tcp_seq end)
+{
+ struct tcp_rxt_seg *rxseg;
+ if (SLIST_EMPTY(&tp->t_rxt_segments))
+ return (NULL);
+
+ SLIST_FOREACH(rxseg, &tp->t_rxt_segments, rx_link) {
+ if (SEQ_LEQ(rxseg->rx_start, start) &&
+ SEQ_GEQ(rxseg->rx_end, end))
+ return (rxseg);
+ if (SEQ_GT(rxseg->rx_start, start))
+ break;
+ }
+ return (NULL);
+}
+
+void
+tcp_rxtseg_clean(struct tcpcb *tp)
+{
+ struct tcp_rxt_seg *rxseg, *next;
+
+ SLIST_FOREACH_SAFE(rxseg, &tp->t_rxt_segments, rx_link, next) {
+ SLIST_REMOVE(&tp->t_rxt_segments, rxseg,
+ tcp_rxt_seg, rx_link);
+ zfree(tcp_rxt_seg_zone, rxseg);
+ }
+ tp->t_dsack_lastuna = tp->snd_max;
+}
+
+boolean_t
+tcp_rxtseg_detect_bad_rexmt(struct tcpcb *tp, tcp_seq th_ack)
+{
+ boolean_t bad_rexmt;
+ struct tcp_rxt_seg *rxseg;
+
+ if (SLIST_EMPTY(&tp->t_rxt_segments))
+ return (FALSE);
+
+ /*
+ * If all of the segments in this window are not cumulatively
+ * acknowledged, then there can still be undetected packet loss.
+ * Do not restore congestion window in that case.
+ */
+ if (SEQ_LT(th_ack, tp->snd_recover))
+ return (FALSE);
+
+ bad_rexmt = TRUE;
+ SLIST_FOREACH(rxseg, &tp->t_rxt_segments, rx_link) {
+ if (rxseg->rx_count > 1 ||
+ !(rxseg->rx_flags & TCP_RXT_SPURIOUS)) {
+ bad_rexmt = FALSE;
+ break;
+ }
+ }
+ return (bad_rexmt);
+}
+
+boolean_t
+tcp_rxtseg_dsack_for_tlp(struct tcpcb *tp)
+{
+ boolean_t dsack_for_tlp = FALSE;
+ struct tcp_rxt_seg *rxseg;
+ if (SLIST_EMPTY(&tp->t_rxt_segments))
+ return (FALSE);
+
+ SLIST_FOREACH(rxseg, &tp->t_rxt_segments, rx_link) {
+ if (rxseg->rx_count == 1 &&
+ SLIST_NEXT(rxseg,rx_link) == NULL &&
+ (rxseg->rx_flags & TCP_RXT_DSACK_FOR_TLP)) {
+ dsack_for_tlp = TRUE;
+ break;
+ }
+ }
+ return (dsack_for_tlp);
+}
+
+u_int32_t
+tcp_rxtseg_total_size(struct tcpcb *tp) {
+ struct tcp_rxt_seg *rxseg;
+ u_int32_t total_size = 0;
+
+ SLIST_FOREACH(rxseg, &tp->t_rxt_segments, rx_link) {
+ total_size += (rxseg->rx_end - rxseg->rx_start) + 1;
+ }
+ return (total_size);
+}
+
+void
+tcp_get_connectivity_status(struct tcpcb *tp,
+ struct tcp_conn_status *connstatus)
+{
+ if (tp == NULL || connstatus == NULL)
+ return;
+ bzero(connstatus, sizeof(*connstatus));
+ if (tp->t_rxtshift >= TCP_CONNECTIVITY_PROBES_MAX) {
+ if (TCPS_HAVEESTABLISHED(tp->t_state)) {
+ connstatus->write_probe_failed = 1;
+ } else {
+ connstatus->conn_probe_failed = 1;
+ }
+ }
+ if (tp->t_rtimo_probes >= TCP_CONNECTIVITY_PROBES_MAX)
+ connstatus->read_probe_failed = 1;
+ if (tp->t_inpcb != NULL && tp->t_inpcb->inp_last_outifp != NULL
+ && (tp->t_inpcb->inp_last_outifp->if_eflags & IFEF_PROBE_CONNECTIVITY))
+ connstatus->probe_activated = 1;
+ return;
+}
+
+boolean_t
+tfo_enabled(const struct tcpcb *tp)
+{
+ return !!(tp->t_flagsext & TF_FASTOPEN);
+}
+
+void
+tcp_disable_tfo(struct tcpcb *tp)
+{
+ tp->t_flagsext &= ~TF_FASTOPEN;
+}
-/* DSEP Review Done pl-20051213-v02 @3253,@3391,@3400 */
projects / apple / xnu.git / blobdiff