xnu-3789.51.2.tar.gz

[apple/xnu.git] / bsd / netinet / tcp_output.c

diff --git a/bsd/netinet/tcp_output.c b/bsd/netinet/tcp_output.c
index 75bd670292e53fed0279343ef8a6c63d66d39ffa..f37afed3a1d5b114b1409a79352c1dc555139c7d 100644 (file)
--- a/bsd/netinet/tcp_output.c
+++ b/bsd/netinet/tcp_output.c
@@ -307,10 +307,9 @@ extern int fw_bypass;              /* firewall check: disable packet chaining if there is ru
 
 extern u_int32_t dlil_filter_disable_tso_count;
 extern u_int32_t kipf_count;
-extern int tcp_recv_bg;
 
-static int tcp_ip_output(struct socket *, struct tcpcb *, struct mbuf *, int,
-    struct mbuf *, int, int, int32_t, boolean_t);
+static int tcp_ip_output(struct socket *, struct tcpcb *, struct mbuf *,
+    int, struct mbuf *, int, int, boolean_t);
 static struct mbuf* tcp_send_lroacks(struct tcpcb *tp, struct mbuf *m, struct tcphdr *th);
 static int tcp_recv_throttle(struct tcpcb *tp);
 
@@ -323,6 +322,9 @@ static int32_t tcp_tfo_check(struct tcpcb *tp, int32_t len)
        if (tp->t_flags & TF_NOOPT)
                goto fallback;
 
+       if (so->so_flags & SOF1_DATA_AUTHENTICATED)
+               return (len);
+
        if (!tcp_heuristic_do_tfo(tp)) {
                tp->t_tfo_stats |= TFO_S_HEURISTICS_DISABLE;
                tcpstat.tcps_tfo_heuristics_disable++;
@@ -401,14 +403,25 @@ tcp_tfo_write_cookie_rep(struct tcpcb *tp, unsigned optlen, u_char *opt)
 }
 
 static unsigned
-tcp_tfo_write_cookie(struct tcpcb *tp, unsigned optlen, int32_t *len,
+tcp_tfo_write_cookie(struct tcpcb *tp, unsigned optlen, int32_t len,
                     u_char *opt)
 {
        u_int8_t tfo_len = MAX_TCPOPTLEN - optlen - TCPOLEN_FASTOPEN_REQ;
+       struct socket *so = tp->t_inpcb->inp_socket;
        unsigned ret = 0;
        int res;
        u_char *bp;
 
+       if (so->so_flags & SOF1_DATA_AUTHENTICATED) {
+               /* If there is some data, let's track it */
+               if (len > 0) {
+                       tp->t_tfo_stats |= TFO_S_SYN_DATA_SENT;
+                       tcpstat.tcps_tfo_syn_data_sent++;
+               }
+
+               return (0);
+       }
+
        bp = opt + optlen;
 
        /*
@@ -435,7 +448,7 @@ tcp_tfo_write_cookie(struct tcpcb *tp, unsigned optlen, int32_t *len,
                tp->t_tfo_flags |= TFO_F_COOKIE_SENT;
 
                /* If there is some data, let's track it */
-               if (*len) {
+               if (len > 0) {
                        tp->t_tfo_stats |= TFO_S_SYN_DATA_SENT;
                        tcpstat.tcps_tfo_syn_data_sent++;
                }
@@ -1006,7 +1019,7 @@ after_sack_rexmit:
                                error = tcp_ip_output(so, tp, packetlist,
                                    packchain_listadd, tp_inp_options,
                                    (so_options & SO_DONTROUTE),
-                                   (sack_rxmit | (sack_bytes_rxmt != 0)), 0,
+                                   (sack_rxmit | (sack_bytes_rxmt != 0)),
                                    isipv6);
                        }
 
@@ -1240,24 +1253,16 @@ after_sack_rexmit:
        if (recwin < (int32_t)(so->so_rcv.sb_hiwat / 4) &&
            recwin < (int)tp->t_maxseg)
                recwin = 0;
-       if (tp->t_flags & TF_SLOWLINK && slowlink_wsize > 0) {
-               if (recwin > (int32_t)slowlink_wsize)
-                       recwin = slowlink_wsize;
-       }
 
 #if TRAFFIC_MGT
-       if (tcp_recv_bg == 1  || IS_TCP_RECV_BG(so)) {
+       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;
-                       if (tp->iaj_rwintop == 0 ||
-                           SEQ_LT(tp->iaj_rwintop, tp->rcv_adv))
-                               tp->iaj_rwintop = tp->rcv_adv;
-                       if (SEQ_LT(tp->iaj_rwintop,
-                           tp->rcv_nxt + min_iaj_win))
-                               tp->iaj_rwintop =  tp->rcv_nxt +
-                                   min_iaj_win;
-                       recwin = imin((int32_t)(tp->iaj_rwintop -
-                           tp->rcv_nxt), recwin);
+                       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;
                }
@@ -1436,8 +1441,7 @@ just_return:
                error = tcp_ip_output(so, tp, packetlist,
                    packchain_listadd,
                    tp_inp_options, (so_options & SO_DONTROUTE),
-                   (sack_rxmit | (sack_bytes_rxmt != 0)), recwin,
-                   isipv6);
+                   (sack_rxmit | (sack_bytes_rxmt != 0)), isipv6);
        }
        /* tcp was closed while we were in ip; resume close */
        if (inp->inp_sndinprog_cnt == 0 &&
@@ -1575,7 +1579,7 @@ send:
 
        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);
+               optlen += tcp_tfo_write_cookie(tp, optlen, len, opt);
 
        if (tfo_enabled(tp) &&
            (flags & (TH_SYN | TH_ACK)) == (TH_SYN | TH_ACK) &&
@@ -2156,6 +2160,8 @@ send:
        }
        th->th_flags = flags;
        th->th_win = htons((u_short) (recwin>>tp->rcv_scale));
+       if (recwin > 0 && SEQ_LT(tp->rcv_adv, tp->rcv_nxt + recwin))
+               tp->rcv_adv = tp->rcv_nxt + recwin;
 
        /*
         * Adjust the RXWIN0SENT flag - indicate that we have advertised
@@ -2562,8 +2568,7 @@ timer:
                        error = tcp_ip_output(so, tp, packetlist,
                            packchain_listadd, tp_inp_options,
                            (so_options & SO_DONTROUTE),
-                           (sack_rxmit | (sack_bytes_rxmt != 0)), recwin,
-                           isipv6);
+                           (sack_rxmit | (sack_bytes_rxmt != 0)), isipv6);
                        if (error) {
                                /*
                                 * Take into account the rest of unsent
@@ -2632,7 +2637,8 @@ out:
                if (error == ENOBUFS) {
                        if (!tp->t_timer[TCPT_REXMT] &&
                            !tp->t_timer[TCPT_PERSIST] &&
-                           SEQ_GT(tp->snd_max, tp->snd_una))
+                           (SEQ_GT(tp->snd_max, tp->snd_una) ||
+                           so->so_snd.sb_cc > 0))
                                tp->t_timer[TCPT_REXMT] =
                                        OFFSET_FROM_START(tp, tp->t_rxtcur);
                        tp->snd_cwnd = tp->t_maxseg;
@@ -2692,8 +2698,7 @@ out:
 
 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,
-    boolean_t isipv6)
+    int cnt, struct mbuf *opt, int flags, int sack_in_progress, boolean_t isipv6)
 {
        int error = 0;
        boolean_t chain;
@@ -2793,14 +2798,9 @@ tcp_ip_output(struct socket *so, struct tcpcb *tp, struct mbuf *pkt,
                inp_route_copyout(inp, &ro);
 
        /*
-        * Data sent (as far as we can tell).
-        * If this advertises a larger window than any other segment,
-        * then remember the size of the advertised window.
         * Make sure ACK/DELACK conditions are cleared before
         * we unlock the socket.
         */
-       if (recwin > 0 && SEQ_GT(tp->rcv_nxt + recwin, tp->rcv_adv))
-               tp->rcv_adv = tp->rcv_nxt + recwin;
        tp->last_ack_sent = tp->rcv_nxt;
        tp->t_flags &= ~(TF_ACKNOW | TF_DELACK);
        tp->t_timer[TCPT_DELACK] = 0;