X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/0c530ab8987f0ae6a1a3d9284f40182b88852816..ca66cea69e6e866fd781ae2260d9474bdd48f2ca:/bsd/netinet/tcp_subr.c?ds=inline diff --git a/bsd/netinet/tcp_subr.c b/bsd/netinet/tcp_subr.c index dc401fdd8..f51febfc1 100644 --- a/bsd/netinet/tcp_subr.c +++ b/bsd/netinet/tcp_subr.c @@ -1,23 +1,29 @@ /* - * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000-2007 Apple Inc. All rights reserved. * - * @APPLE_LICENSE_HEADER_START@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * - * The contents of this file constitute Original Code as defined in and - * are subject to the Apple Public Source License Version 1.1 (the - * "License"). You may not use this file except in compliance with the - * License. Please obtain a copy of the License at - * http://www.apple.com/publicsource and read it before using this file. + * This file contains Original Code and/or Modifications of Original Code + * as defined in and that are subject to the Apple Public Source License + * Version 2.0 (the 'License'). You may not use this file except in + * compliance with the License. The rights granted to you under the License + * may not be used to create, or enable the creation or redistribution of, + * unlawful or unlicensed copies of an Apple operating system, or to + * circumvent, violate, or enable the circumvention or violation of, any + * terms of an Apple operating system software license agreement. * - * This Original Code and all software distributed under the License are - * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER + * Please obtain a copy of the License at + * http://www.opensource.apple.com/apsl/ and read it before using this file. + * + * The Original Code and all software distributed under the License are + * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the - * License for the specific language governing rights and limitations - * under the License. + * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. + * Please see the License for the specific language governing rights and + * limitations under the License. * - * @APPLE_LICENSE_HEADER_END@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995 @@ -54,7 +60,12 @@ * @(#)tcp_subr.c 8.2 (Berkeley) 5/24/95 * $FreeBSD: src/sys/netinet/tcp_subr.c,v 1.73.2.22 2001/08/22 00:59:12 silby Exp $ */ - +/* + * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce + * support for mandatory and extensible security protections. This notice + * is included in support of clause 2.2 (b) of the Apple Public License, + * Version 2.0. + */ #include #include @@ -63,9 +74,7 @@ #include #include #include -#if INET6 #include -#endif #include #include #include @@ -74,8 +83,7 @@ #include #include #include - - +#include #include #include @@ -117,7 +125,11 @@ #endif #endif /*IPSEC*/ -#include +#if CONFIG_MACF_NET +#include +#endif /* MAC_NET */ + +#include #include #define DBG_FNC_TCP_CLOSE NETDBG_CODE(DBG_NETTCP, ((5 << 8) | 2)) @@ -127,7 +139,6 @@ extern int tcp_lq_overflow; /* temporary: for testing */ #if IPSEC extern int ipsec_bypass; -extern lck_mtx_t *sadb_mutex; #endif int tcp_mssdflt = TCP_MSS; @@ -200,11 +211,26 @@ SYSCTL_INT(_net_inet_tcp, OID_AUTO, strict_rfc1948, CTLFLAG_RW, static int tcp_isn_reseed_interval = 0; SYSCTL_INT(_net_inet_tcp, OID_AUTO, isn_reseed_interval, CTLFLAG_RW, &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, + &tcp_background_io_enabled, 0, "Background IO Enabled"); + +int tcp_TCPTV_MIN = 1; +SYSCTL_INT(_net_inet_tcp, OID_AUTO, rtt_min, CTLFLAG_RW, + &tcp_TCPTV_MIN, 0, "min rtt value allowed"); static void tcp_cleartaocache(void); static void tcp_notify(struct inpcb *, int); struct zone *sack_hole_zone; +extern unsigned int total_mb_cnt; +extern unsigned int total_cl_cnt; +extern int sbspace_factor; +extern int tcp_sockthreshold; +extern int slowlink_wsize; /* window correction for slow links */ +extern int path_mtu_discovery; + + /* * Target size of TCP PCB hash tables. Must be a power of two. * @@ -212,7 +238,7 @@ struct zone *sack_hole_zone; * variable net.inet.tcp.tcbhashsize */ #ifndef TCBHASHSIZE -#define TCBHASHSIZE 4096 +#define TCBHASHSIZE CONFIG_TCBHASHSIZE #endif /* @@ -243,14 +269,17 @@ extern int cur_tw_slot; extern u_long *delack_bitmask; extern u_long route_generation; +int get_inpcb_str_size(void); +int get_tcp_str_size(void); -int get_inpcb_str_size() + +int get_inpcb_str_size(void) { return sizeof(struct inpcb); } -int get_tcp_str_size() +int get_tcp_str_size(void) { return sizeof(struct tcpcb); } @@ -272,14 +301,13 @@ tcp_init() tcp_ccgen = 1; tcp_cleartaocache(); - tcp_delacktime = TCPTV_DELACK; tcp_keepinit = TCPTV_KEEP_INIT; tcp_keepidle = TCPTV_KEEP_IDLE; tcp_keepintvl = TCPTV_KEEPINTVL; tcp_maxpersistidle = TCPTV_KEEP_IDLE; tcp_msl = TCPTV_MSL; read_random(&tcp_now, sizeof(tcp_now)); - tcp_now = tcp_now & 0x7fffffff; /* Starts tcp internal 500ms clock at a random value */ + tcp_now = tcp_now & 0x3fffffff; /* Starts tcp internal 100ms clock at a random value */ LIST_INIT(&tcb); @@ -342,6 +370,8 @@ tcp_init() for (i=0; i < N_TIME_WAIT_SLOTS; i++) { LIST_INIT(&time_wait_slots[i]); } + + timeout(tcp_fasttimo, NULL, hz/TCP_RETRANSHZ); } /* @@ -439,13 +469,20 @@ tcp_maketemplate(tp) * NOTE: If m != NULL, then ti must point to *inside* the mbuf. */ void -tcp_respond(tp, ipgen, th, m, ack, seq, flags) - struct tcpcb *tp; - void *ipgen; - register struct tcphdr *th; - register struct mbuf *m; - tcp_seq ack, seq; - int flags; +tcp_respond( + struct tcpcb *tp, + void *ipgen, + register struct tcphdr *th, + register struct mbuf *m, + tcp_seq ack, + tcp_seq seq, + int flags, +#if CONFIG_FORCE_OUT_IFP + ifnet_t ifp +#else + __unused ifnet_t ifp +#endif + ) { register int tlen; int win = 0; @@ -469,7 +506,7 @@ tcp_respond(tp, ipgen, th, m, ack, seq, flags) if (tp) { if (!(flags & TH_RST)) { - win = sbspace(&tp->t_inpcb->inp_socket->so_rcv); + win = tcp_sbspace(tp); if (win > (long)TCP_MAXWIN << tp->rcv_scale) win = (long)TCP_MAXWIN << tp->rcv_scale; } @@ -492,7 +529,7 @@ tcp_respond(tp, ipgen, th, m, ack, seq, flags) } } if (m == 0) { - m = m_gethdr(M_DONTWAIT, MT_HEADER); + m = m_gethdr(M_DONTWAIT, MT_HEADER); /* MAC-OK */ if (m == NULL) return; tlen = 0; @@ -556,6 +593,21 @@ tcp_respond(tp, ipgen, th, m, ack, seq, flags) m->m_len = tlen; m->m_pkthdr.len = tlen; m->m_pkthdr.rcvif = 0; +#if CONFIG_MACF_NET + if (tp != NULL && tp->t_inpcb != NULL) { + /* + * Packet is associated with a socket, so allow the + * label of the response to reflect the socket label. + */ + mac_mbuf_label_associate_inpcb(tp->t_inpcb, m); + } else { + /* + * Packet is not associated with a socket, so possibly + * update the label in place. + */ + mac_netinet_tcp_reply(m); + } +#endif nth->th_seq = htonl(seq); nth->th_ack = htonl(ack); nth->th_x2 = 0; @@ -604,7 +656,11 @@ tcp_respond(tp, ipgen, th, m, ack, seq, flags) } else #endif /* INET6 */ { - (void) ip_output_list(m, 0, NULL, ro, ipflags, NULL); +#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; @@ -656,11 +712,14 @@ tcp_newtcpcb(inp) */ tp->t_srtt = TCPTV_SRTTBASE; tp->t_rttvar = ((TCPTV_RTOBASE - TCPTV_SRTTBASE) << TCP_RTTVAR_SHIFT) / 4; - tp->t_rttmin = TCPTV_MIN; + tp->t_rttmin = tcp_TCPTV_MIN; tp->t_rxtcur = TCPTV_RTOBASE; 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; /* * IPv4 TTL initialization is necessary for an IPv6 socket as well, * because the socket may be bound to an IPv6 wildcard address, @@ -735,7 +794,24 @@ tcp_close(tp) break; } + /* + * If another thread for this tcp is currently in ip (indicated by + * the TF_SENDINPROG flag), defer the cleanup until after it returns + * back to tcp. This is done to serialize the close until after all + * pending output is finished, in order to avoid having the PCB be + * detached and the cached route cleaned, only for ip to cache the + * route back into the PCB again. Note that we've cleared all the + * timers at this point. Set TF_CLOSING to indicate to tcp_output() + * that is should call us again once it returns from ip; at that + * point both flags should be cleared and we can proceed further + * with the cleanup. + */ + if (tp->t_flags & (TF_CLOSING|TF_SENDINPROG)) { + tp->t_flags |= TF_CLOSING; + return (NULL); + } + lck_mtx_lock(rt_mtx); /* * If we got enough samples through the srtt filter, * save the rtt and rttvar in the routing entry. @@ -749,6 +825,7 @@ tcp_close(tp) */ if (tp->t_rttupdated >= 16) { register u_long i = 0; + #if INET6 if (isipv6) { struct sockaddr_in6 *sin6; @@ -773,7 +850,7 @@ tcp_close(tp) if ((rt->rt_rmx.rmx_locks & RTV_RTT) == 0) { i = tp->t_srtt * - (RTM_RTTUNIT / (PR_SLOWHZ * TCP_RTT_SCALE)); + (RTM_RTTUNIT / (TCP_RETRANSHZ * TCP_RTT_SCALE)); if (rt->rt_rmx.rmx_rtt && i) /* * filter this update to half the old & half @@ -789,7 +866,7 @@ tcp_close(tp) } if ((rt->rt_rmx.rmx_locks & RTV_RTTVAR) == 0) { i = tp->t_rttvar * - (RTM_RTTUNIT / (PR_SLOWHZ * TCP_RTTVAR_SCALE)); + (RTM_RTTUNIT / (TCP_RETRANSHZ * TCP_RTTVAR_SCALE)); if (rt->rt_rmx.rmx_rttvar && i) rt->rt_rmx.rmx_rttvar = (rt->rt_rmx.rmx_rttvar + i) / 2; @@ -850,7 +927,7 @@ tcp_close(tp) * mark route for deletion if no information is * cached. */ - if ((tp->t_flags & TF_LQ_OVERFLOW) && tcp_lq_overflow && + 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; @@ -858,10 +935,17 @@ tcp_close(tp) } no_valid_rt: /* free the reassembly queue, if any */ + lck_mtx_unlock(rt_mtx); + (void) tcp_freeq(tp); tcp_free_sackholes(tp); + /* Free the packet list */ + if (tp->t_pktlist_head != NULL) + m_freem_list(tp->t_pktlist_head); + TCP_PKTLIST_CLEAR(tp); + #ifdef __APPLE__ if (so->cached_in_sock_layer) inp->inp_saved_ppcb = (caddr_t) tp; @@ -900,9 +984,6 @@ tcp_freeq(tp) void tcp_drain() { -/* - * ###LD 05/19/04 locking issue, tcpdrain is disabled, deadlock situation with tcbinfo.mtx - */ if (do_tcpdrain) { struct inpcb *inpb; @@ -917,7 +998,9 @@ tcp_drain() * where we're really low on mbufs, this is potentially * usefull. */ - lck_rw_lock_exclusive(tcbinfo.mtx); + if (!lck_rw_try_lock_exclusive(tcbinfo.mtx)) /* do it next time if the lock is in use */ + return; + for (inpb = LIST_FIRST(tcbinfo.listhead); inpb; inpb = LIST_NEXT(inpb, inp_list)) { if ((tcpb = intotcpcb(inpb))) { @@ -981,10 +1064,12 @@ tcp_notify(inp, error) static int tcp_pcblist SYSCTL_HANDLER_ARGS { +#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 @@ -1020,12 +1105,12 @@ tcp_pcblist SYSCTL_HANDLER_ARGS 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; + /* + * 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); @@ -1043,6 +1128,17 @@ tcp_pcblist SYSCTL_HANDLER_ARGS #endif 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; @@ -1337,9 +1433,10 @@ tcp6_ctlinput(cmd, sa, d) #define ISN_BYTES_PER_SECOND 1048576 -u_char isn_secret[32]; -int isn_last_reseed; -MD5_CTX isn_ctx; +//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) @@ -1348,6 +1445,9 @@ tcp_new_isn(tp) u_int32_t md5_buffer[4]; tcp_seq new_isn; struct timeval timenow; + u_char isn_secret[32]; + int isn_last_reseed = 0; + MD5_CTX isn_ctx; /* Use arc4random for SYN-ACKs when not in exact RFC1948 mode. */ if (((tp->t_state == TCPS_LISTEN) || (tp->t_state == TCPS_TIME_WAIT)) @@ -1409,8 +1509,10 @@ tcp_quench( { struct tcpcb *tp = intotcpcb(inp); - if (tp) + if (tp) { tp->snd_cwnd = tp->t_maxseg; + tp->t_bytes_acked = 0; + } } /* @@ -1452,6 +1554,7 @@ tcp_mtudisc( #endif /* INET6 */ if (tp) { + lck_mtx_lock(rt_mtx); #if INET6 if (isipv6) rt = tcp_rtlookup6(inp); @@ -1464,6 +1567,7 @@ tcp_mtudisc( isipv6 ? tcp_v6mssdflt : #endif /* INET6 */ tcp_mssdflt; + lck_mtx_unlock(rt_mtx); return; } taop = rmx_taop(rt->rt_rmx); @@ -1479,6 +1583,7 @@ tcp_mtudisc( #endif /* INET6 */ ; + lck_mtx_unlock(rt_mtx); if (offered) mss = min(mss, offered); /* @@ -1530,11 +1635,15 @@ tcp_rtlookup(inp) { 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(rt_mtx, LCK_MTX_ASSERT_OWNED); + 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) { @@ -1542,10 +1651,30 @@ tcp_rtlookup(inp) ro->ro_dst.sa_len = sizeof(struct sockaddr_in); ((struct sockaddr_in *) &ro->ro_dst)->sin_addr = inp->inp_faddr; - rtalloc(ro); + rtalloc_ign_locked(ro, 0UL); rt = ro->ro_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: + * 1) it is disabled via the sysctl + * 2) the route isn't up + * 3) the MTU is locked (if it is, then discovery has been + * disabled) + */ + + tp = intotcpcb(inp); + + if (!path_mtu_discovery || ((rt != NULL) && + (!(rt->rt_flags & RTF_UP) || (rt->rt_rmx.rmx_locks & RTV_MTU)))) + tp->t_flags &= ~TF_PMTUD; + else + tp->t_flags |= TF_PMTUD; + return rt; } @@ -1556,6 +1685,9 @@ tcp_rtlookup6(inp) { struct route_in6 *ro6; struct rtentry *rt; + struct tcpcb *tp; + + lck_mtx_assert(rt_mtx, LCK_MTX_ASSERT_OWNED); ro6 = &inp->in6p_route; rt = ro6->ro_rt; @@ -1568,10 +1700,38 @@ tcp_rtlookup6(inp) dst6->sin6_family = AF_INET6; dst6->sin6_len = sizeof(*dst6); dst6->sin6_addr = inp->in6p_faddr; - rtalloc((struct route *)ro6); + rtalloc_ign_locked((struct route *)ro6, 0UL); rt = ro6->ro_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: + * 1) we have a valid route to the destination + * 2) the MTU is not locked (if it is, then discovery has been + * disabled) + */ + + + tp = intotcpcb(inp); + + /* + * Update MTU discovery determination. Don't do it if: + * 1) it is disabled via the sysctl + * 2) the route isn't up + * 3) the MTU is locked (if it is, then discovery has been + * disabled) + */ + + if (!path_mtu_discovery || ((rt != NULL) && + (!(rt->rt_flags & RTF_UP) || (rt->rt_rmx.rmx_locks & RTV_MTU)))) + tp->t_flags &= ~TF_PMTUD; + else + tp->t_flags |= TF_PMTUD; + return rt; } #endif /* INET6 */ @@ -1593,11 +1753,10 @@ ipsec_hdrsiz_tcp(tp) if ((tp == NULL) || ((inp = tp->t_inpcb) == NULL)) return 0; - MGETHDR(m, M_DONTWAIT, MT_DATA); + MGETHDR(m, M_DONTWAIT, MT_DATA); /* MAC-OK */ if (!m) return 0; - lck_mtx_lock(sadb_mutex); #if INET6 if ((inp->inp_vflag & INP_IPV6) != 0) { ip6 = mtod(m, struct ip6_hdr *); @@ -1615,7 +1774,6 @@ ipsec_hdrsiz_tcp(tp) tcp_fillheaders(tp, ip, th); hdrsiz = ipsec4_hdrsiz(m, IPSEC_DIR_OUTBOUND, inp); } - lck_mtx_unlock(sadb_mutex); m_free(m); return hdrsiz; } @@ -1631,7 +1789,9 @@ tcp_gettaocache(inp) struct inpcb *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); @@ -1641,10 +1801,14 @@ tcp_gettaocache(inp) /* Make sure this is a host route and is up. */ if (rt == NULL || - (rt->rt_flags & (RTF_UP|RTF_HOST)) != (RTF_UP|RTF_HOST)) + (rt->rt_flags & (RTF_UP|RTF_HOST)) != (RTF_UP|RTF_HOST)) { + lck_mtx_unlock(rt_mtx); return NULL; - - return rmx_taop(rt->rt_rmx); + } + + taop = rmx_taop(rt->rt_rmx); + lck_mtx_unlock(rt_mtx); + return (taop); } /* @@ -1675,17 +1839,17 @@ tcp_lock(so, refcount, lr) lck_mtx_lock(((struct inpcb *)so->so_pcb)->inpcb_mtx); } else { - panic("tcp_lock: so=%x NO PCB! lr=%x\n", so, lr_saved); + panic("tcp_lock: so=%p NO PCB! lr=%x\n", so, lr_saved); lck_mtx_lock(so->so_proto->pr_domain->dom_mtx); } if (so->so_usecount < 0) - panic("tcp_lock: so=%x so_pcb=%x lr=%x ref=%x\n", + panic("tcp_lock: so=%p so_pcb=%p lr=%x ref=%x\n", so, so->so_pcb, lr_saved, so->so_usecount); if (refcount) so->so_usecount++; - so->lock_lr[so->next_lock_lr] = (u_int32_t *)lr_saved; + so->lock_lr[so->next_lock_lr] = (u_int32_t)lr_saved; so->next_lock_lr = (so->next_lock_lr+1) % SO_LCKDBG_MAX; return (0); } @@ -1702,19 +1866,19 @@ tcp_unlock(so, refcount, lr) else lr_saved = lr; #ifdef MORE_TCPLOCK_DEBUG - printf("tcp_unlock: so=%x sopcb=%x lock=%x ref=%x lr=%x\n", + 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); #endif if (refcount) so->so_usecount--; if (so->so_usecount < 0) - panic("tcp_unlock: so=%x usecount=%x\n", so, so->so_usecount); + panic("tcp_unlock: so=%p usecount=%x\n", so, so->so_usecount); if (so->so_pcb == NULL) - panic("tcp_unlock: so=%x NO PCB usecount=%x lr=%x\n", so, so->so_usecount, lr_saved); + 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_int *)lr_saved; + so->unlock_lr[so->next_unlock_lr] = (u_int32_t)lr_saved; so->next_unlock_lr = (so->next_unlock_lr+1) % SO_LCKDBG_MAX; lck_mtx_unlock(((struct inpcb *)so->so_pcb)->inpcb_mtx); } @@ -1722,19 +1886,69 @@ tcp_unlock(so, refcount, lr) } lck_mtx_t * -tcp_getlock(so, locktype) - struct socket *so; - int locktype; +tcp_getlock( + struct socket *so, + __unused int locktype) { struct inpcb *inp = sotoinpcb(so); if (so->so_pcb) { if (so->so_usecount < 0) - panic("tcp_getlock: so=%x usecount=%x\n", so, so->so_usecount); + panic("tcp_getlock: so=%p usecount=%x\n", so, so->so_usecount); return(inp->inpcb_mtx); } else { - panic("tcp_getlock: so=%x NULL so_pcb\n", so); + panic("tcp_getlock: so=%p NULL so_pcb\n", so); return (so->so_proto->pr_domain->dom_mtx); } } +long +tcp_sbspace(struct tcpcb *tp) +{ + struct sockbuf *sb = &tp->t_inpcb->inp_socket->so_rcv; + long space, newspace; + + space = ((long) lmin((sb->sb_hiwat - sb->sb_cc), + (sb->sb_mbmax - sb->sb_mbcnt))); + +#if TRAFFIC_MGT + if (tp->t_inpcb->inp_socket->so_traffic_mgt_flags & TRAFFIC_MGT_SO_BACKGROUND) { + if (tcp_background_io_enabled && + tp->t_inpcb->inp_socket->so_traffic_mgt_flags & TRAFFIC_MGT_SO_BG_SUPPRESSED) { + tp->t_flags |= TF_RXWIN0SENT; + return 0; /* Triggers TCP window closing by responding there is no space */ + } + } +#endif /* TRAFFIC_MGT */ + + /* Avoid inscreasing window size if the current window + * is already very low, we could be in "persist" mode and + * we could break some apps (see rdar://5409343) + */ + + if (space < tp->t_maxseg) + return space; + + /* Clip window size for slower link */ + + if (((tp->t_flags & TF_SLOWLINK) != 0) && slowlink_wsize > 0 ) + return lmin(space, slowlink_wsize); + + /* + * Check for ressources constraints before over-ajusting the amount of space we can + * advertise in the TCP window size updates. + */ + + 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); + } + newspace = (long) lmax(((long)sb->sb_maxused - sb->sb_cc), (long)tp->rcv_maxbyps); + + if (newspace > space) + space = newspace; + } + return space; +} +/* DSEP Review Done pl-20051213-v02 @3253,@3391,@3400 */