X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/2d21ac55c334faf3a56e5634905ed6987fc787d4..c331a0bec715536613c8dd5f34a4e115d5b15824:/bsd/netinet/tcp_subr.c?ds=sidebyside diff --git a/bsd/netinet/tcp_subr.c b/bsd/netinet/tcp_subr.c index f120008cd..d675d776b 100644 --- a/bsd/netinet/tcp_subr.c +++ b/bsd/netinet/tcp_subr.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 2000-2007 Apple Inc. All rights reserved. + * Copyright (c) 2000-2008 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * @@ -88,10 +88,12 @@ #include #include +#define tcp_minmssoverload fring #define _IP_VHL #include #include #include +#include #if INET6 #include #endif @@ -101,6 +103,7 @@ #endif #include #include +#include #if INET6 #include #endif @@ -125,6 +128,8 @@ #endif #endif /*IPSEC*/ +#undef tcp_minmssoverload + #if CONFIG_MACF_NET #include #endif /* MAC_NET */ @@ -189,10 +194,6 @@ static int tcp_do_rfc1644 = 0; SYSCTL_INT(_net_inet_tcp, TCPCTL_DO_RFC1644, rfc1644, CTLFLAG_RW, &tcp_do_rfc1644 , 0, "Enable rfc1644 (TTCP) extensions"); -static int tcp_tcbhashsize = 0; -SYSCTL_INT(_net_inet_tcp, OID_AUTO, tcbhashsize, CTLFLAG_RD, - &tcp_tcbhashsize, 0, "Size of TCP control-block hashtable"); - static int do_tcpdrain = 0; SYSCTL_INT(_net_inet_tcp, OID_AUTO, do_tcpdrain, CTLFLAG_RW, &do_tcpdrain, 0, "Enable tcp_drain routine for extra help when low on mbufs"); @@ -219,6 +220,10 @@ int tcp_TCPTV_MIN = 1; SYSCTL_INT(_net_inet_tcp, OID_AUTO, rtt_min, CTLFLAG_RW, &tcp_TCPTV_MIN, 0, "min rtt value allowed"); +__private_extern__ int tcp_use_randomport = 0; +SYSCTL_INT(_net_inet_tcp, OID_AUTO, randomize_ports, CTLFLAG_RW, + &tcp_use_randomport, 0, "Randomize TCP port numbers"); + static void tcp_cleartaocache(void); static void tcp_notify(struct inpcb *, int); struct zone *sack_hole_zone; @@ -241,6 +246,10 @@ extern int path_mtu_discovery; #define TCBHASHSIZE CONFIG_TCBHASHSIZE #endif +__private_extern__ int tcp_tcbhashsize = TCBHASHSIZE; +SYSCTL_INT(_net_inet_tcp, OID_AUTO, tcbhashsize, CTLFLAG_RD, + &tcp_tcbhashsize, 0, "Size of TCP control-block hashtable"); + /* * This is the actual shape of what we allocate using the zone * allocator. Doing it this way allows us to protect both structures @@ -261,17 +270,13 @@ struct inp_tp { #undef ALIGNMENT #undef ALIGNM1 -static struct tcpcb dummy_tcb; - - extern struct inpcbhead time_wait_slots[]; -extern int cur_tw_slot; -extern u_long *delack_bitmask; -extern u_long route_generation; +extern u_int32_t *delack_bitmask; int get_inpcb_str_size(void); int get_tcp_str_size(void); +static void tcpcb_to_otcpcb(struct tcpcb *, struct otcpcb *); int get_inpcb_str_size(void) { @@ -293,7 +298,6 @@ int tcp_freeq(struct tcpcb *tp); void tcp_init() { - int hashsize = TCBHASHSIZE; vm_size_t str_size; int i; struct inpcbinfo *pcbinfo; @@ -313,14 +317,13 @@ tcp_init() LIST_INIT(&tcb); tcbinfo.listhead = &tcb; pcbinfo = &tcbinfo; - if (!powerof2(hashsize)) { + if (!powerof2(tcp_tcbhashsize)) { printf("WARNING: TCB hash size not a power of 2\n"); - hashsize = 512; /* safe default */ + tcp_tcbhashsize = 512; /* safe default */ } - tcp_tcbhashsize = hashsize; - tcbinfo.hashsize = hashsize; - tcbinfo.hashbase = hashinit(hashsize, M_PCB, &tcbinfo.hashmask); - tcbinfo.porthashbase = hashinit(hashsize, M_PCB, + tcbinfo.hashsize = tcp_tcbhashsize; + tcbinfo.hashbase = hashinit(tcp_tcbhashsize, M_PCB, &tcbinfo.hashmask); + tcbinfo.porthashbase = hashinit(tcp_tcbhashsize, M_PCB, &tcbinfo.porthashmask); str_size = (vm_size_t) sizeof(struct inp_tp); tcbinfo.ipi_zone = (void *) zinit(str_size, 120000*str_size, 8192, "tcpcb"); @@ -337,9 +340,6 @@ tcp_init() if (max_linkhdr + TCP_MINPROTOHDR > MHLEN) panic("tcp_init"); #undef TCP_MINPROTOHDR - dummy_tcb.t_state = TCP_NSTATES; - dummy_tcb.t_flags = 0; - tcbinfo.dummy_cb = (caddr_t) &dummy_tcb; /* * allocate lock group attribute and group for tcp pcb mutexes @@ -357,10 +357,7 @@ tcp_init() return; /* pretty much dead if this fails... */ } - - in_pcb_nat_init(&tcbinfo, AF_INET, IPPROTO_TCP, SOCK_STREAM); - - delack_bitmask = _MALLOC((4 * hashsize)/32, M_PCB, M_WAITOK); + delack_bitmask = _MALLOC((4 * tcp_tcbhashsize)/32, M_PCB, M_WAITOK); if (delack_bitmask == 0) panic("Delack Memory"); @@ -477,11 +474,7 @@ tcp_respond( tcp_seq ack, tcp_seq seq, int flags, -#if CONFIG_FORCE_OUT_IFP - ifnet_t ifp -#else - __unused ifnet_t ifp -#endif + unsigned int ifscope ) { register int tlen; @@ -496,7 +489,6 @@ tcp_respond( struct ip6_hdr *ip6; int isipv6; #endif /* INET6 */ - int ipflags = 0; #if INET6 isipv6 = IP_VHL_V(((struct ip *)ipgen)->ip_vhl) == 6; @@ -507,8 +499,8 @@ tcp_respond( if (tp) { if (!(flags & TH_RST)) { win = tcp_sbspace(tp); - if (win > (long)TCP_MAXWIN << tp->rcv_scale) - win = (long)TCP_MAXWIN << tp->rcv_scale; + if (win > (int32_t)TCP_MAXWIN << tp->rcv_scale) + win = (int32_t)TCP_MAXWIN << tp->rcv_scale; } #if INET6 if (isipv6) @@ -608,6 +600,7 @@ tcp_respond( mac_netinet_tcp_reply(m); } #endif + nth->th_seq = htonl(seq); nth->th_ack = htonl(ack); nth->th_x2 = 0; @@ -646,9 +639,13 @@ tcp_respond( return; } #endif +#if PKT_PRIORITY + if (tp != NULL && soisbackground(tp->t_inpcb->inp_socket)) + m_prio_background(m); +#endif /* PKT_PRIORITY */ #if INET6 if (isipv6) { - (void)ip6_output(m, NULL, ro6, ipflags, NULL, NULL, 0); + (void)ip6_output(m, NULL, ro6, 0, NULL, NULL, 0); if (ro6 == &sro6 && ro6->ro_rt) { rtfree(ro6->ro_rt); ro6->ro_rt = NULL; @@ -656,14 +653,22 @@ tcp_respond( } else #endif /* INET6 */ { -#if CONFIG_FORCE_OUT_IFP - ifp = (tp && tp->t_inpcb) ? tp->t_inpcb->pdp_ifp : - (ifp && (ifp->if_flags & IFF_POINTOPOINT) != 0) ? ifp : NULL; -#endif - (void) ip_output_list(m, 0, NULL, ro, ipflags, NULL, ifp); - if (ro == &sro && ro->ro_rt) { - rtfree(ro->ro_rt); - ro->ro_rt = NULL; + struct ip_out_args ipoa = { ifscope }; + + if (ro != &sro) { + /* Copy the cached route and take an extra reference */ + inp_route_copyout(tp->t_inpcb, &sro); + } + /* + * For consistency, pass a local route copy. + */ + (void) ip_output(m, NULL, &sro, IP_OUTARGS, NULL, &ipoa); + + if (ro != &sro) { + /* Synchronize cached PCB route */ + inp_route_copyin(tp->t_inpcb, &sro); + } else if (sro.ro_rt != NULL) { + rtfree(sro.ro_rt); } } } @@ -717,6 +722,7 @@ tcp_newtcpcb(inp) tp->snd_cwnd = TCP_MAXWIN << TCP_MAX_WINSHIFT; tp->snd_bwnd = TCP_MAXWIN << TCP_MAX_WINSHIFT; tp->snd_ssthresh = TCP_MAXWIN << TCP_MAX_WINSHIFT; + tp->snd_ssthresh_prev = TCP_MAXWIN << TCP_MAX_WINSHIFT; tp->t_rcvtime = 0; tp->t_bw_rtttime = 0; /* @@ -768,7 +774,7 @@ tcp_close(tp) #if INET6 int isipv6 = (inp->inp_vflag & INP_IPV6) != 0; #endif /* INET6 */ - register struct rtentry *rt; + struct rtentry *rt; int dosavessthresh; if ( inp->inp_ppcb == NULL) /* tcp_close was called previously, bail */ @@ -810,7 +816,14 @@ tcp_close(tp) return (NULL); } - lck_mtx_lock(rt_mtx); +#if INET6 + rt = isipv6 ? inp->in6p_route.ro_rt : inp->inp_route.ro_rt; +#else + rt = inp->inp_route.ro_rt; +#endif + if (rt != NULL) + RT_LOCK_SPIN(rt); + /* * If we got enough samples through the srtt filter, * save the rtt and rttvar in the routing entry. @@ -823,13 +836,13 @@ tcp_close(tp) * update anything that the user "locked". */ if (tp->t_rttupdated >= 16) { - register u_long i = 0; + register u_int32_t i = 0; #if INET6 if (isipv6) { struct sockaddr_in6 *sin6; - if ((rt = inp->in6p_route.ro_rt) == NULL) + if (rt == NULL) goto no_valid_rt; sin6 = (struct sockaddr_in6 *)rt_key(rt); if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) @@ -837,16 +850,15 @@ tcp_close(tp) } else #endif /* INET6 */ - rt = inp->inp_route.ro_rt; - if (rt == NULL || - ((struct sockaddr_in *)rt_key(rt))->sin_addr.s_addr - == INADDR_ANY || rt->generation_id != route_generation) { + if (rt == NULL || !(rt->rt_flags & RTF_UP) || + ((struct sockaddr_in *)rt_key(rt))->sin_addr.s_addr == + INADDR_ANY || rt->generation_id != route_generation) { if (tp->t_state >= TCPS_CLOSE_WAIT) tp->t_state = TCPS_CLOSING; - goto no_valid_rt; } + RT_LOCK_ASSERT_HELD(rt); if ((rt->rt_rmx.rmx_locks & RTV_RTT) == 0) { i = tp->t_srtt * (RTM_RTTUNIT / (TCP_RETRANSHZ * TCP_RTT_SCALE)); @@ -902,7 +914,7 @@ tcp_close(tp) i = (i + tp->t_maxseg / 2) / tp->t_maxseg; if (i < 2) i = 2; - i *= (u_long)(tp->t_maxseg + + i *= (u_int32_t)(tp->t_maxseg + #if INET6 (isipv6 ? sizeof (struct ip6_hdr) + sizeof (struct tcphdr) : @@ -920,22 +932,22 @@ tcp_close(tp) tcpstat.tcps_cachedssthresh++; } } - rt = inp->inp_route.ro_rt; - if (rt) { - /* - * mark route for deletion if no information is - * cached. - */ - if ((so->so_flags & SOF_OVERFLOW) && tcp_lq_overflow && - ((rt->rt_rmx.rmx_locks & RTV_RTT) == 0)){ - if (rt->rt_rmx.rmx_rtt == 0) - rt->rt_flags |= RTF_DELCLONE; + + /* + * Mark route for deletion if no information is cached. + */ + if (rt != NULL && (so->so_flags & SOF_OVERFLOW) && tcp_lq_overflow) { + if (!(rt->rt_rmx.rmx_locks & RTV_RTT) && + rt->rt_rmx.rmx_rtt == 0) { + rt->rt_flags |= RTF_DELCLONE; } } - no_valid_rt: - /* free the reassembly queue, if any */ - lck_mtx_unlock(rt_mtx); +no_valid_rt: + if (rt != NULL) + RT_UNLOCK(rt); + + /* free the reassembly queue, if any */ (void) tcp_freeq(tp); tcp_free_sackholes(tp); @@ -1060,6 +1072,69 @@ tcp_notify(inp, error) #endif } +/* + * tcpcb_to_otcpcb copies specific bits of a tcpcb to a otcpcb format. + * The otcpcb data structure is passed to user space and must not change. + */ +static void +tcpcb_to_otcpcb(struct tcpcb *tp, struct otcpcb *otp) +{ + int i; + + otp->t_segq = (u_int32_t)(uintptr_t)tp->t_segq.lh_first; + otp->t_dupacks = tp->t_dupacks; + for (i = 0; i < TCPT_NTIMERS; i++) + otp->t_timer[i] = tp->t_timer[i]; + otp->t_inpcb = (_TCPCB_PTR(struct inpcb *))(uintptr_t)tp->t_inpcb; + otp->t_state = tp->t_state; + otp->t_flags = tp->t_flags; + otp->t_force = tp->t_force; + otp->snd_una = tp->snd_una; + otp->snd_max = tp->snd_max; + otp->snd_nxt = tp->snd_nxt; + otp->snd_up = tp->snd_up; + otp->snd_wl1 = tp->snd_wl1; + otp->snd_wl2 = tp->snd_wl2; + otp->iss = tp->iss; + otp->irs = tp->irs; + otp->rcv_nxt = tp->rcv_nxt; + otp->rcv_adv = tp->rcv_adv; + otp->rcv_wnd = tp->rcv_wnd; + otp->rcv_up = tp->rcv_up; + otp->snd_wnd = tp->snd_wnd; + otp->snd_cwnd = tp->snd_cwnd; + otp->snd_ssthresh = tp->snd_ssthresh; + otp->t_maxopd = tp->t_maxopd; + otp->t_rcvtime = tp->t_rcvtime; + otp->t_starttime = tp->t_starttime; + otp->t_rtttime = tp->t_rtttime; + otp->t_rtseq = tp->t_rtseq; + otp->t_rxtcur = tp->t_rxtcur; + otp->t_maxseg = tp->t_maxseg; + otp->t_srtt = tp->t_srtt; + otp->t_rttvar = tp->t_rttvar; + otp->t_rxtshift = tp->t_rxtshift; + otp->t_rttmin = tp->t_rttmin; + otp->t_rttupdated = tp->t_rttupdated; + otp->max_sndwnd = tp->max_sndwnd; + otp->t_softerror = tp->t_softerror; + otp->t_oobflags = tp->t_oobflags; + otp->t_iobc = tp->t_iobc; + otp->snd_scale = tp->snd_scale; + otp->rcv_scale = tp->rcv_scale; + otp->request_r_scale = tp->request_r_scale; + otp->requested_s_scale = tp->requested_s_scale; + 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->snd_recover = tp->snd_recover; + otp->snd_cwnd_prev = tp->snd_cwnd_prev; + otp->snd_ssthresh_prev = tp->snd_ssthresh_prev; + otp->t_badrxtwin = tp->t_badrxtwin; +} + static int tcp_pcblist SYSCTL_HANDLER_ARGS { @@ -1153,10 +1228,11 @@ tcp_pcblist SYSCTL_HANDLER_ARGS inpcb_to_compat(inp, &xt.xt_inp); inp_ppcb = inp->inp_ppcb; if (inp_ppcb != NULL) { - bcopy(inp_ppcb, &xt.xt_tp, sizeof xt.xt_tp); - } - else + tcpcb_to_otcpcb((struct tcpcb *)inp_ppcb, + &xt.xt_tp); + } else { bzero((char *) &xt.xt_tp, sizeof xt.xt_tp); + } if (inp->inp_socket) sotoxsocket(inp->inp_socket, &xt.xt_socket); error = SYSCTL_OUT(req, &xt, sizeof xt); @@ -1185,85 +1261,188 @@ tcp_pcblist SYSCTL_HANDLER_ARGS SYSCTL_PROC(_net_inet_tcp, TCPCTL_PCBLIST, pcblist, CTLFLAG_RD, 0, 0, tcp_pcblist, "S,xtcpcb", "List of active TCP connections"); -#ifndef __APPLE__ -static int -tcp_getcred(SYSCTL_HANDLER_ARGS) +#if !CONFIG_EMBEDDED + +static void +tcpcb_to_xtcpcb64(struct tcpcb *tp, struct xtcpcb64 *otp) { - struct sockaddr_in addrs[2]; - struct inpcb *inp; - int error, s; - - error = suser(req->p); - if (error) - return (error); - error = SYSCTL_IN(req, addrs, sizeof(addrs)); - if (error) - return (error); - s = splnet(); - inp = in_pcblookup_hash(&tcbinfo, addrs[1].sin_addr, addrs[1].sin_port, - addrs[0].sin_addr, addrs[0].sin_port, 0, NULL); - if (inp == NULL || inp->inp_socket == NULL) { - error = ENOENT; - goto out; - } - error = SYSCTL_OUT(req, inp->inp_socket->so_cred, sizeof(*(kauth_cred_t)0); -out: - splx(s); - return (error); + int i; + + otp->t_segq = (u_int32_t)(uintptr_t)tp->t_segq.lh_first; + otp->t_dupacks = tp->t_dupacks; + for (i = 0; i < TCPT_NTIMERS; i++) + otp->t_timer[i] = tp->t_timer[i]; + otp->t_state = tp->t_state; + otp->t_flags = tp->t_flags; + otp->t_force = tp->t_force; + otp->snd_una = tp->snd_una; + otp->snd_max = tp->snd_max; + otp->snd_nxt = tp->snd_nxt; + otp->snd_up = tp->snd_up; + otp->snd_wl1 = tp->snd_wl1; + otp->snd_wl2 = tp->snd_wl2; + otp->iss = tp->iss; + otp->irs = tp->irs; + otp->rcv_nxt = tp->rcv_nxt; + otp->rcv_adv = tp->rcv_adv; + otp->rcv_wnd = tp->rcv_wnd; + otp->rcv_up = tp->rcv_up; + otp->snd_wnd = tp->snd_wnd; + otp->snd_cwnd = tp->snd_cwnd; + otp->snd_ssthresh = tp->snd_ssthresh; + otp->t_maxopd = tp->t_maxopd; + otp->t_rcvtime = tp->t_rcvtime; + otp->t_starttime = tp->t_starttime; + otp->t_rtttime = tp->t_rtttime; + otp->t_rtseq = tp->t_rtseq; + otp->t_rxtcur = tp->t_rxtcur; + otp->t_maxseg = tp->t_maxseg; + otp->t_srtt = tp->t_srtt; + otp->t_rttvar = tp->t_rttvar; + otp->t_rxtshift = tp->t_rxtshift; + otp->t_rttmin = tp->t_rttmin; + otp->t_rttupdated = tp->t_rttupdated; + otp->max_sndwnd = tp->max_sndwnd; + otp->t_softerror = tp->t_softerror; + otp->t_oobflags = tp->t_oobflags; + otp->t_iobc = tp->t_iobc; + otp->snd_scale = tp->snd_scale; + otp->rcv_scale = tp->rcv_scale; + otp->request_r_scale = tp->request_r_scale; + otp->requested_s_scale = tp->requested_s_scale; + 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->snd_recover = tp->snd_recover; + otp->snd_cwnd_prev = tp->snd_cwnd_prev; + otp->snd_ssthresh_prev = tp->snd_ssthresh_prev; + otp->t_badrxtwin = tp->t_badrxtwin; } -SYSCTL_PROC(_net_inet_tcp, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, - 0, 0, tcp_getcred, "S,ucred", "Get the ucred of a TCP connection"); -#if INET6 static int -tcp6_getcred(SYSCTL_HANDLER_ARGS) +tcp_pcblist64 SYSCTL_HANDLER_ARGS { - struct sockaddr_in6 addrs[2]; - struct inpcb *inp; - int error, s, mapped = 0; - - error = suser(req->p); - if (error) - return (error); - error = SYSCTL_IN(req, addrs, sizeof(addrs)); - if (error) - return (error); - if (IN6_IS_ADDR_V4MAPPED(&addrs[0].sin6_addr)) { - if (IN6_IS_ADDR_V4MAPPED(&addrs[1].sin6_addr)) - mapped = 1; - else - return (EINVAL); - } - s = splnet(); - if (mapped == 1) - inp = in_pcblookup_hash(&tcbinfo, - *(struct in_addr *)&addrs[1].sin6_addr.s6_addr[12], - addrs[1].sin6_port, - *(struct in_addr *)&addrs[0].sin6_addr.s6_addr[12], - addrs[0].sin6_port, - 0, NULL); - else - inp = in6_pcblookup_hash(&tcbinfo, &addrs[1].sin6_addr, - addrs[1].sin6_port, - &addrs[0].sin6_addr, addrs[0].sin6_port, - 0, NULL); - if (inp == NULL || inp->inp_socket == NULL) { - error = ENOENT; - goto out; - } - error = SYSCTL_OUT(req, inp->inp_socket->so_cred, - sizeof(*(kauth_cred_t)0); -out: - splx(s); - return (error); -} +#pragma unused(oidp, arg1, arg2) + int error, i, n; + struct inpcb *inp, **inp_list; + inp_gen_t gencnt; + struct xinpgen xig; + int slot; + + /* + * The process of preparing the TCB list is too time-consuming and + * resource-intensive to repeat twice on every request. + */ + lck_rw_lock_shared(tcbinfo.mtx); + if (req->oldptr == USER_ADDR_NULL) { + n = tcbinfo.ipi_count; + req->oldidx = 2 * (sizeof xig) + + (n + n/8) * sizeof(struct xtcpcb64); + lck_rw_done(tcbinfo.mtx); + return 0; + } + + if (req->newptr != USER_ADDR_NULL) { + lck_rw_done(tcbinfo.mtx); + return EPERM; + } -SYSCTL_PROC(_net_inet6_tcp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, - 0, 0, - tcp6_getcred, "S,ucred", "Get the ucred of a TCP6 connection"); + /* + * OK, now we're committed to doing something. + */ + gencnt = tcbinfo.ipi_gencnt; + n = tcbinfo.ipi_count; + + bzero(&xig, sizeof(xig)); + xig.xig_len = sizeof xig; + xig.xig_count = n; + xig.xig_gen = gencnt; + xig.xig_sogen = so_gencnt; + error = SYSCTL_OUT(req, &xig, sizeof xig); + if (error) { + lck_rw_done(tcbinfo.mtx); + return error; + } + /* + * We are done if there is no pcb + */ + if (n == 0) { + lck_rw_done(tcbinfo.mtx); + return 0; + } + + inp_list = _MALLOC(n * sizeof *inp_list, M_TEMP, M_WAITOK); + if (inp_list == 0) { + lck_rw_done(tcbinfo.mtx); + return ENOMEM; + } + + for (inp = LIST_FIRST(tcbinfo.listhead), i = 0; inp && i < n; + inp = LIST_NEXT(inp, inp_list)) { +#ifdef __APPLE__ + if (inp->inp_gencnt <= gencnt && inp->inp_state != INPCB_STATE_DEAD) +#else + if (inp->inp_gencnt <= gencnt && !prison_xinpcb(req->p, inp)) #endif -#endif /* __APPLE__*/ + inp_list[i++] = inp; + } + + for (slot = 0; slot < N_TIME_WAIT_SLOTS; slot++) { + struct inpcb *inpnxt; + + for (inp = time_wait_slots[slot].lh_first; inp && i < n; inp = inpnxt) { + inpnxt = inp->inp_list.le_next; + if (inp->inp_gencnt <= gencnt && inp->inp_state != INPCB_STATE_DEAD) + inp_list[i++] = inp; + } + } + + n = i; + + error = 0; + for (i = 0; i < n; i++) { + inp = inp_list[i]; + if (inp->inp_gencnt <= gencnt && inp->inp_state != INPCB_STATE_DEAD) { + struct xtcpcb64 xt; + + bzero(&xt, sizeof(xt)); + xt.xt_len = sizeof xt; + inpcb_to_xinpcb64(inp, &xt.xt_inpcb); + xt.xt_inpcb.inp_ppcb = (u_int64_t)(uintptr_t)inp->inp_ppcb; + if (inp->inp_ppcb != NULL) + tcpcb_to_xtcpcb64((struct tcpcb *)inp->inp_ppcb, &xt); + if (inp->inp_socket) + sotoxsocket64(inp->inp_socket, &xt.xt_inpcb.xi_socket); + error = SYSCTL_OUT(req, &xt, sizeof xt); + } + } + if (!error) { + /* + * Give the user an updated idea of our state. + * If the generation differs from what we told + * her before, she knows that something happened + * while we were processing this request, and it + * might be necessary to retry. + */ + bzero(&xig, sizeof(xig)); + xig.xig_len = sizeof xig; + xig.xig_gen = tcbinfo.ipi_gencnt; + xig.xig_sogen = so_gencnt; + xig.xig_count = tcbinfo.ipi_count; + error = SYSCTL_OUT(req, &xig, sizeof xig); + } + FREE(inp_list, M_TEMP); + lck_rw_done(tcbinfo.mtx); + return error; +} + +SYSCTL_PROC(_net_inet_tcp, OID_AUTO, pcblist64, CTLFLAG_RD, 0, 0, + tcp_pcblist64, "S,xtcpcb64", "List of active TCP connections"); + +#endif /* !CONFIG_EMBEDDED */ void tcp_ctlinput(cmd, sa, vip) @@ -1271,35 +1450,41 @@ tcp_ctlinput(cmd, sa, vip) struct sockaddr *sa; void *vip; { + tcp_seq icmp_tcp_seq; struct ip *ip = vip; struct tcphdr *th; struct in_addr faddr; struct inpcb *inp; struct tcpcb *tp; + void (*notify)(struct inpcb *, int) = tcp_notify; - tcp_seq icmp_seq; + + struct icmp *icp; faddr = ((struct sockaddr_in *)sa)->sin_addr; if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY) return; - if (cmd == PRC_QUENCH) - notify = tcp_quench; + if (cmd == PRC_MSGSIZE) + notify = tcp_mtudisc; else if (icmp_may_rst && (cmd == PRC_UNREACH_ADMIN_PROHIB || cmd == PRC_UNREACH_PORT) && ip) notify = tcp_drop_syn_sent; - else if (cmd == PRC_MSGSIZE) - notify = tcp_mtudisc; else if (PRC_IS_REDIRECT(cmd)) { ip = 0; notify = in_rtchange; } else if (cmd == PRC_HOSTDEAD) ip = 0; + /* Source quench is deprecated */ + else if (cmd == PRC_QUENCH) + return; else if ((unsigned)cmd > PRC_NCMDS || inetctlerrmap[cmd] == 0) return; if (ip) { + icp = (struct icmp *)((caddr_t)ip + - offsetof(struct icmp, icmp_ip)); th = (struct tcphdr *)((caddr_t)ip - + (IP_VHL_HL(ip->ip_vhl) << 2)); + + (IP_VHL_HL(ip->ip_vhl) << 2)); inp = in_pcblookup_hash(&tcbinfo, faddr, th->th_dport, ip->ip_src, th->th_sport, 0, NULL); if (inp != NULL && inp->inp_socket != NULL) { @@ -1308,11 +1493,64 @@ tcp_ctlinput(cmd, sa, vip) tcp_unlock(inp->inp_socket, 1, 0); return; } - icmp_seq = htonl(th->th_seq); + icmp_tcp_seq = htonl(th->th_seq); tp = intotcpcb(inp); - if (SEQ_GEQ(icmp_seq, tp->snd_una) && - SEQ_LT(icmp_seq, tp->snd_max)) + if (SEQ_GEQ(icmp_tcp_seq, tp->snd_una) && + SEQ_LT(icmp_tcp_seq, tp->snd_max)) { + if (cmd == PRC_MSGSIZE) { + + /* + * MTU discovery: + * If we got a needfrag and there is a host route to the + * original destination, and the MTU is not locked, then + * set the MTU in the route to the suggested new value + * (if given) and then notify as usual. The ULPs will + * notice that the MTU has changed and adapt accordingly. + * If no new MTU was suggested, then we guess a new one + * less than the current value. If the new MTU is + * unreasonably small (defined by sysctl tcp_minmss), then + * we reset the MTU to the interface value and enable the + * lock bit, indicating that we are no longer doing MTU + * discovery. + */ + struct rtentry *rt; + int mtu; + struct sockaddr_in icmpsrc = { sizeof (struct sockaddr_in), AF_INET, + 0 , { 0 }, { 0,0,0,0,0,0,0,0 } }; + icmpsrc.sin_addr = icp->icmp_ip.ip_dst; + + rt = rtalloc1((struct sockaddr *)&icmpsrc, 0, + RTF_CLONING | RTF_PRCLONING); + if (rt != NULL) { + RT_LOCK(rt); + if ((rt->rt_flags & RTF_HOST) && + !(rt->rt_rmx.rmx_locks & RTV_MTU)) { + mtu = ntohs(icp->icmp_nextmtu); + if (!mtu) + mtu = ip_next_mtu(rt->rt_rmx. + rmx_mtu, 1); +#if DEBUG_MTUDISC + printf("MTU for %s reduced to %d\n", + inet_ntop(AF_INET, + &icmpsrc.sin_addr, ipv4str, + sizeof (ipv4str)), mtu); +#endif + if (mtu < max(296, (tcp_minmss + + sizeof (struct tcpiphdr)))) { + /* rt->rt_rmx.rmx_mtu = + rt->rt_ifp->if_mtu; */ + rt->rt_rmx.rmx_locks |= RTV_MTU; + } else if (rt->rt_rmx.rmx_mtu > mtu) { + rt->rt_rmx.rmx_mtu = mtu; + } + } + RT_UNLOCK(rt); + rtfree(rt); + } + } + (*notify)(inp, inetctlerrmap[cmd]); + } tcp_unlock(inp->inp_socket, 1, 0); } } else @@ -1342,13 +1580,14 @@ tcp6_ctlinput(cmd, sa, d) sa->sa_len != sizeof(struct sockaddr_in6)) return; - if (cmd == PRC_QUENCH) - notify = tcp_quench; - else if (cmd == PRC_MSGSIZE) + if (cmd == PRC_MSGSIZE) notify = tcp_mtudisc; else if (!PRC_IS_REDIRECT(cmd) && ((unsigned)cmd > PRC_NCMDS || inet6ctlerrmap[cmd] == 0)) return; + /* Source quench is deprecated */ + else if (cmd == PRC_QUENCH) + return; /* if the parameter is from icmp6, decode it. */ if (d != NULL) { @@ -1380,9 +1619,10 @@ tcp6_ctlinput(cmd, sa, d) in6_pcbnotify(&tcbinfo, sa, th.th_dport, (struct sockaddr *)ip6cp->ip6c_src, th.th_sport, cmd, notify); - } else - in6_pcbnotify(&tcbinfo, sa, 0, (struct sockaddr *)sa6_src, - 0, cmd, notify); + } else { + in6_pcbnotify(&tcbinfo, sa, 0, + (struct sockaddr *)(size_t)sa6_src, 0, cmd, notify); + } } #endif /* INET6 */ @@ -1432,11 +1672,6 @@ tcp6_ctlinput(cmd, sa, d) #define ISN_BYTES_PER_SECOND 1048576 -//PWC - md5 routines cause alignment exceptions. Need to figure out why. For now use lame incremental -// isn. how's that for not easily guessable!? - -int pwc_bogus; - tcp_seq tcp_new_isn(tp) struct tcpcb *tp; @@ -1496,23 +1731,6 @@ tcp_new_isn(tp) return new_isn; } -/* - * When a source quench is received, close congestion window - * to one segment. We will gradually open it again as we proceed. - */ -void -tcp_quench( - struct inpcb *inp, - __unused int errno -) -{ - struct tcpcb *tp = intotcpcb(inp); - - if (tp) { - tp->snd_cwnd = tp->t_maxseg; - tp->t_bytes_acked = 0; - } -} /* * When a specific ICMP unreachable message is received and the @@ -1553,20 +1771,22 @@ tcp_mtudisc( #endif /* INET6 */ if (tp) { - lck_mtx_lock(rt_mtx); #if INET6 if (isipv6) rt = tcp_rtlookup6(inp); else #endif /* INET6 */ - rt = tcp_rtlookup(inp); + rt = tcp_rtlookup(inp, IFSCOPE_NONE); if (!rt || !rt->rt_rmx.rmx_mtu) { tp->t_maxopd = tp->t_maxseg = #if INET6 isipv6 ? tcp_v6mssdflt : #endif /* INET6 */ tcp_mssdflt; - lck_mtx_unlock(rt_mtx); + + /* Route locked during lookup above */ + if (rt != NULL) + RT_UNLOCK(rt); return; } taop = rmx_taop(rt->rt_rmx); @@ -1582,7 +1802,9 @@ tcp_mtudisc( #endif /* INET6 */ ; - lck_mtx_unlock(rt_mtx); + /* Route locked during lookup above */ + RT_UNLOCK(rt); + if (offered) mss = min(mss, offered); /* @@ -1626,37 +1848,52 @@ tcp_mtudisc( * Look-up the routing entry to the peer of this inpcb. If no route * is found and it cannot be allocated the return NULL. This routine * is called by TCP routines that access the rmx structure and by tcp_mss - * to get the interface MTU. + * to get the interface MTU. If a route is found, this routine will + * hold the rtentry lock; the caller is responsible for unlocking. */ struct rtentry * -tcp_rtlookup(inp) +tcp_rtlookup(inp, input_ifscope) struct inpcb *inp; + unsigned int input_ifscope; { struct route *ro; struct rtentry *rt; struct tcpcb *tp; - ro = &inp->inp_route; - if (ro == NULL) - return (NULL); - rt = ro->ro_rt; + lck_mtx_assert(rnh_lock, LCK_MTX_ASSERT_NOTOWNED); - lck_mtx_assert(rt_mtx, LCK_MTX_ASSERT_OWNED); + ro = &inp->inp_route; + if ((rt = ro->ro_rt) != NULL) + RT_LOCK(rt); - if (rt == NULL || !(rt->rt_flags & RTF_UP) || rt->generation_id != route_generation) { + if (rt == NULL || !(rt->rt_flags & RTF_UP) || + rt->generation_id != route_generation) { /* No route yet, so try to acquire one */ if (inp->inp_faddr.s_addr != INADDR_ANY) { + unsigned int ifscope; + ro->ro_dst.sa_family = AF_INET; ro->ro_dst.sa_len = sizeof(struct sockaddr_in); ((struct sockaddr_in *) &ro->ro_dst)->sin_addr = inp->inp_faddr; - rtalloc_ign_locked(ro, 0UL); - rt = ro->ro_rt; + + /* + * If the socket was bound to an interface, then + * the bound-to-interface takes precedence over + * the inbound interface passed in by the caller + * (if we get here as part of the output path then + * input_ifscope is IFSCOPE_NONE). + */ + ifscope = (inp->inp_flags & INP_BOUND_IF) ? + inp->inp_boundif : input_ifscope; + + if (rt != NULL) + RT_UNLOCK(rt); + rtalloc_scoped_ign(ro, 0, ifscope); + if ((rt = ro->ro_rt) != NULL) + RT_LOCK(rt); } } - if (rt != NULL && rt->rt_ifp != NULL) - somultipages(inp->inp_socket, - (rt->rt_ifp->if_hwassist & IFNET_MULTIPAGES)); /* * Update MTU discovery determination. Don't do it if: @@ -1674,6 +1911,24 @@ tcp_rtlookup(inp) else tp->t_flags |= TF_PMTUD; +#if CONFIG_IFEF_NOWINDOWSCALE + if (tcp_obey_ifef_nowindowscale && + tp->t_state == TCPS_SYN_SENT && rt != NULL && rt->rt_ifp != NULL && + (rt->rt_ifp->if_eflags & IFEF_NOWINDOWSCALE)) { + /* Window scaling is enabled on this interface */ + tp->t_flags &= ~TF_REQ_SCALE; + } +#endif + + if (rt != NULL && rt->rt_ifp != NULL) { + somultipages(inp->inp_socket, + (rt->rt_ifp->if_hwassist & IFNET_MULTIPAGES)); + tcp_set_tso(tp, rt->rt_ifp); + } + + /* + * Caller needs to call RT_UNLOCK(rt). + */ return rt; } @@ -1686,11 +1941,14 @@ tcp_rtlookup6(inp) struct rtentry *rt; struct tcpcb *tp; - lck_mtx_assert(rt_mtx, LCK_MTX_ASSERT_OWNED); + lck_mtx_assert(rnh_lock, LCK_MTX_ASSERT_NOTOWNED); ro6 = &inp->in6p_route; - rt = ro6->ro_rt; - if (rt == NULL || !(rt->rt_flags & RTF_UP)) { + if ((rt = ro6->ro_rt) != NULL) + RT_LOCK(rt); + + if (rt == NULL || !(rt->rt_flags & RTF_UP) || + rt->generation_id != route_generation) { /* No route yet, so try to acquire one */ if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { struct sockaddr_in6 *dst6; @@ -1699,13 +1957,13 @@ tcp_rtlookup6(inp) dst6->sin6_family = AF_INET6; dst6->sin6_len = sizeof(*dst6); dst6->sin6_addr = inp->in6p_faddr; - rtalloc_ign_locked((struct route *)ro6, 0UL); - rt = ro6->ro_rt; + if (rt != NULL) + RT_UNLOCK(rt); + rtalloc_ign((struct route *)ro6, 0); + if ((rt = ro6->ro_rt) != NULL) + RT_LOCK(rt); } } - if (rt != NULL && rt->rt_ifp != NULL) - somultipages(inp->inp_socket, - (rt->rt_ifp->if_hwassist & IFNET_MULTIPAGES)); /* * Update path MTU Discovery determination * while looking up the route: @@ -1731,6 +1989,24 @@ tcp_rtlookup6(inp) else tp->t_flags |= TF_PMTUD; +#if CONFIG_IFEF_NOWINDOWSCALE + if (tcp_obey_ifef_nowindowscale && + tp->t_state == TCPS_SYN_SENT && rt != NULL && rt->rt_ifp != NULL && + (rt->rt_ifp->if_eflags & IFEF_NOWINDOWSCALE)) { + /* Window scaling is not enabled on this interface */ + tp->t_flags &= ~TF_REQ_SCALE; + } +#endif + + if (rt != NULL && rt->rt_ifp != NULL) { + somultipages(inp->inp_socket, + (rt->rt_ifp->if_hwassist & IFNET_MULTIPAGES)); + tcp_set_tso(tp, rt->rt_ifp); + } + + /* + * Caller needs to call RT_UNLOCK(rt). + */ return rt; } #endif /* INET6 */ @@ -1790,23 +2066,25 @@ tcp_gettaocache(inp) struct rtentry *rt; struct rmxp_tao *taop; - lck_mtx_lock(rt_mtx); #if INET6 if ((inp->inp_vflag & INP_IPV6) != 0) rt = tcp_rtlookup6(inp); else #endif /* INET6 */ - rt = tcp_rtlookup(inp); + rt = tcp_rtlookup(inp, IFSCOPE_NONE); /* Make sure this is a host route and is up. */ if (rt == NULL || (rt->rt_flags & (RTF_UP|RTF_HOST)) != (RTF_UP|RTF_HOST)) { - lck_mtx_unlock(rt_mtx); + /* Route locked during lookup above */ + if (rt != NULL) + RT_UNLOCK(rt); return NULL; } taop = rmx_taop(rt->rt_rmx); - lck_mtx_unlock(rt_mtx); + /* Route locked during lookup above */ + RT_UNLOCK(rt); return (taop); } @@ -1824,60 +2102,66 @@ tcp_cleartaocache() } int -tcp_lock(so, refcount, lr) - struct socket *so; - int refcount; - int lr; +tcp_lock(struct socket *so, int refcount, void *lr) { - int lr_saved; - if (lr == 0) - lr_saved = (unsigned int) __builtin_return_address(0); - else lr_saved = lr; + void *lr_saved; - if (so->so_pcb) { + if (lr == NULL) + lr_saved = __builtin_return_address(0); + else + lr_saved = lr; + + if (so->so_pcb != NULL) { lck_mtx_lock(((struct inpcb *)so->so_pcb)->inpcb_mtx); - } - else { - panic("tcp_lock: so=%p NO PCB! lr=%x\n", so, lr_saved); - lck_mtx_lock(so->so_proto->pr_domain->dom_mtx); + } else { + panic("tcp_lock: so=%p NO PCB! lr=%p lrh= %s\n", + so, lr_saved, solockhistory_nr(so)); + /* NOTREACHED */ } - if (so->so_usecount < 0) - panic("tcp_lock: so=%p so_pcb=%p lr=%x ref=%x\n", - so, so->so_pcb, lr_saved, so->so_usecount); - + if (so->so_usecount < 0) { + panic("tcp_lock: so=%p so_pcb=%p lr=%p ref=%x lrh= %s\n", + so, so->so_pcb, lr_saved, so->so_usecount, solockhistory_nr(so)); + /* NOTREACHED */ + } if (refcount) so->so_usecount++; - so->lock_lr[so->next_lock_lr] = (u_int32_t)lr_saved; + so->lock_lr[so->next_lock_lr] = lr_saved; so->next_lock_lr = (so->next_lock_lr+1) % SO_LCKDBG_MAX; return (0); } int -tcp_unlock(so, refcount, lr) - struct socket *so; - int refcount; - int lr; +tcp_unlock(struct socket *so, int refcount, void *lr) { - int lr_saved; - if (lr == 0) - lr_saved = (unsigned int) __builtin_return_address(0); - else lr_saved = lr; + void *lr_saved; + + if (lr == NULL) + lr_saved = __builtin_return_address(0); + else + lr_saved = lr; #ifdef MORE_TCPLOCK_DEBUG - printf("tcp_unlock: so=%p sopcb=%x lock=%x ref=%x lr=%x\n", - so, so->so_pcb, ((struct inpcb *)so->so_pcb)->inpcb_mtx, so->so_usecount, lr_saved); + printf("tcp_unlock: so=%p sopcb=%p lock=%p ref=%x lr=%p\n", + so, so->so_pcb, ((struct inpcb *)so->so_pcb)->inpcb_mtx, + so->so_usecount, lr_saved); #endif if (refcount) so->so_usecount--; - if (so->so_usecount < 0) - panic("tcp_unlock: so=%p usecount=%x\n", so, so->so_usecount); - if (so->so_pcb == NULL) - panic("tcp_unlock: so=%p NO PCB usecount=%x lr=%x\n", so, so->so_usecount, lr_saved); - else { - lck_mtx_assert(((struct inpcb *)so->so_pcb)->inpcb_mtx, LCK_MTX_ASSERT_OWNED); - so->unlock_lr[so->next_unlock_lr] = (u_int32_t)lr_saved; + if (so->so_usecount < 0) { + panic("tcp_unlock: so=%p usecount=%x lrh= %s\n", + so, so->so_usecount, solockhistory_nr(so)); + /* NOTREACHED */ + } + if (so->so_pcb == NULL) { + panic("tcp_unlock: so=%p NO PCB usecount=%x lr=%p lrh= %s\n", + so, so->so_usecount, lr_saved, solockhistory_nr(so)); + /* NOTREACHED */ + } else { + lck_mtx_assert(((struct inpcb *)so->so_pcb)->inpcb_mtx, + LCK_MTX_ASSERT_OWNED); + so->unlock_lr[so->next_unlock_lr] = lr_saved; so->next_unlock_lr = (so->next_unlock_lr+1) % SO_LCKDBG_MAX; lck_mtx_unlock(((struct inpcb *)so->so_pcb)->inpcb_mtx); } @@ -1893,25 +2177,30 @@ tcp_getlock( if (so->so_pcb) { if (so->so_usecount < 0) - panic("tcp_getlock: so=%p usecount=%x\n", so, so->so_usecount); + panic("tcp_getlock: so=%p usecount=%x lrh= %s\n", + so, so->so_usecount, solockhistory_nr(so)); return(inp->inpcb_mtx); } else { - panic("tcp_getlock: so=%p NULL so_pcb\n", so); + panic("tcp_getlock: so=%p NULL so_pcb %s\n", + so, solockhistory_nr(so)); return (so->so_proto->pr_domain->dom_mtx); } } -long + +int32_t tcp_sbspace(struct tcpcb *tp) { struct sockbuf *sb = &tp->t_inpcb->inp_socket->so_rcv; - long space, newspace; + int32_t space, newspace; - space = ((long) lmin((sb->sb_hiwat - sb->sb_cc), + space = ((int32_t) imin((sb->sb_hiwat - sb->sb_cc), (sb->sb_mbmax - sb->sb_mbcnt))); + if (space < 0) + space = 0; #if TRAFFIC_MGT - if (tp->t_inpcb->inp_socket->so_traffic_mgt_flags & TRAFFIC_MGT_SO_BACKGROUND) { + if (tp->t_inpcb->inp_socket->so_traffic_mgt_flags & TRAFFIC_MGT_SO_BG_REGULATE) { if (tcp_background_io_enabled && tp->t_inpcb->inp_socket->so_traffic_mgt_flags & TRAFFIC_MGT_SO_BG_SUPPRESSED) { tp->t_flags |= TF_RXWIN0SENT; @@ -1931,7 +2220,7 @@ tcp_sbspace(struct tcpcb *tp) /* Clip window size for slower link */ if (((tp->t_flags & TF_SLOWLINK) != 0) && slowlink_wsize > 0 ) - return lmin(space, slowlink_wsize); + return imin(space, slowlink_wsize); /* * Check for ressources constraints before over-ajusting the amount of space we can @@ -1940,14 +2229,56 @@ tcp_sbspace(struct tcpcb *tp) if (sbspace_factor && (tp->t_inpcb->inp_pcbinfo->ipi_count < tcp_sockthreshold) && (total_mb_cnt / 8) < (mbstat.m_clusters / sbspace_factor)) { - if (space < (long)(sb->sb_maxused - sb->sb_cc)) {/* make sure we don't constrain the window if we have enough ressources */ - space = (long) lmax((sb->sb_maxused - sb->sb_cc), tp->rcv_maxbyps); + if (space < (int32_t)(sb->sb_maxused - sb->sb_cc)) {/* make sure we don't constrain the window if we have enough ressources */ + space = (int32_t) imax((sb->sb_maxused - sb->sb_cc), tp->rcv_maxbyps); } - newspace = (long) lmax(((long)sb->sb_maxused - sb->sb_cc), (long)tp->rcv_maxbyps); + newspace = (int32_t) imax(((int32_t)sb->sb_maxused - sb->sb_cc), (int32_t)tp->rcv_maxbyps); if (newspace > space) space = newspace; } return space; } +/* + * Checks TCP Segment Offloading capability for a given connection and interface pair. + */ +void +tcp_set_tso(tp, ifp) + struct tcpcb *tp; + struct ifnet *ifp; +{ +#if INET6 + struct inpcb *inp = tp->t_inpcb; + int isipv6 = (inp->inp_vflag & INP_IPV6) != 0; + + if (isipv6) { + /* + * Radar 6921834: Disable TSO IPv6 because there is no support + * for TSO & HW checksum in ip6_output yet + */ +#if 0 + if (ifp && ifp->if_hwassist & IFNET_TSO_IPV6) { + tp->t_flags |= TF_TSO; + if (ifp->if_tso_v6_mtu != 0) + tp->tso_max_segment_size = ifp->if_tso_v6_mtu; + else + tp->tso_max_segment_size = TCP_MAXWIN; + } else + tp->t_flags &= ~TF_TSO; + +#endif + } else +#endif /* INET6 */ + + { + if (ifp && ifp->if_hwassist & IFNET_TSO_IPV4) { + tp->t_flags |= TF_TSO; + if (ifp->if_tso_v4_mtu != 0) + tp->tso_max_segment_size = ifp->if_tso_v4_mtu; + else + tp->tso_max_segment_size = TCP_MAXWIN; + } else + tp->t_flags &= ~TF_TSO; + } +} /* DSEP Review Done pl-20051213-v02 @3253,@3391,@3400 */