/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2007 Apple Inc. All rights reserved.
*
- * @APPLE_LICENSE_HEADER_START@
- *
- * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* 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. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
+ * 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.
+ *
+ * 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
* 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
* @(#)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 <sys/param.h>
#include <sys/systm.h>
#include <sys/sysctl.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
-#if INET6
#include <sys/domain.h>
-#endif
#include <sys/proc.h>
+#include <sys/kauth.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/protosw.h>
#include <sys/random.h>
#include <sys/syslog.h>
-
-
+#include <kern/locks.h>
+#include <kern/zalloc.h>
#include <net/route.h>
#include <net/if.h>
#endif
#endif /*IPSEC*/
-#include <sys/md5.h>
+#if CONFIG_MACF_NET
+#include <security/mac_framework.h>
+#endif /* MAC_NET */
+
+#include <libkern/crypto/md5.h>
#include <sys/kdebug.h>
#define DBG_FNC_TCP_CLOSE NETDBG_CODE(DBG_NETTCP, ((5 << 8) | 2))
+extern int tcp_lq_overflow;
/* temporary: for testing */
#if IPSEC
"Default TCP Maximum Segment Size for IPv6");
#endif
+/*
+ * Minimum MSS we accept and use. This prevents DoS attacks where
+ * we are forced to a ridiculous low MSS like 20 and send hundreds
+ * of packets instead of one. The effect scales with the available
+ * bandwidth and quickly saturates the CPU and network interface
+ * with packet generation and sending. Set to zero to disable MINMSS
+ * checking. This setting prevents us from sending too small packets.
+ */
+int tcp_minmss = TCP_MINMSS;
+SYSCTL_INT(_net_inet_tcp, OID_AUTO, minmss, CTLFLAG_RW,
+ &tcp_minmss , 0, "Minmum TCP Maximum Segment Size");
+
+/*
+ * Number of TCP segments per second we accept from remote host
+ * before we start to calculate average segment size. If average
+ * segment size drops below the minimum TCP MSS we assume a DoS
+ * attack and reset+drop the connection. Care has to be taken not to
+ * set this value too small to not kill interactive type connections
+ * (telnet, SSH) which send many small packets.
+ */
+#ifdef FIX_WORKAROUND_FOR_3894301
+__private_extern__ int tcp_minmssoverload = TCP_MINMSSOVERLOAD;
+#else
+__private_extern__ int tcp_minmssoverload = 0;
+#endif
+SYSCTL_INT(_net_inet_tcp, OID_AUTO, minmssoverload, CTLFLAG_RW,
+ &tcp_minmssoverload , 0, "Number of TCP Segments per Second allowed to"
+ "be under the MINMSS Size");
+
static int tcp_do_rfc1323 = 1;
SYSCTL_INT(_net_inet_tcp, TCPCTL_DO_RFC1323, rfc1323, CTLFLAG_RW,
&tcp_do_rfc1323 , 0, "Enable rfc1323 (high performance TCP) extensions");
SYSCTL_INT(_net_inet_tcp, OID_AUTO, tcbhashsize, CTLFLAG_RD,
&tcp_tcbhashsize, 0, "Size of TCP control-block hashtable");
-static int do_tcpdrain = 1;
+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");
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;
-static void tcp_cleartaocache __P((void));
-static void tcp_notify __P((struct inpcb *, int));
/*
* Target size of TCP PCB hash tables. Must be a power of two.
* variable net.inet.tcp.tcbhashsize
*/
#ifndef TCBHASHSIZE
-#define TCBHASHSIZE 4096
+#define TCBHASHSIZE CONFIG_TCBHASHSIZE
#endif
/*
char align[(sizeof(struct inpcb) + ALIGNM1) & ~ALIGNM1];
} inp_tp_u;
struct tcpcb tcb;
-#ifndef __APPLE__
- struct callout inp_tp_rexmt, inp_tp_persist, inp_tp_keep, inp_tp_2msl;
- struct callout inp_tp_delack;
-#endif
};
#undef ALIGNMENT
#undef ALIGNM1
extern struct inpcbhead time_wait_slots[];
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);
}
-int tcp_freeq __P((struct tcpcb *tp));
+int tcp_freeq(struct tcpcb *tp);
/*
int hashsize = TCBHASHSIZE;
vm_size_t str_size;
int i;
+ struct inpcbinfo *pcbinfo;
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 & 0x7fffffffffffffff; /* 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);
tcbinfo.listhead = &tcb;
-#ifndef __APPLE__
- TUNABLE_INT_FETCH("net.inet.tcp.tcbhashsize", &hashsize);
-#endif
+ pcbinfo = &tcbinfo;
if (!powerof2(hashsize)) {
printf("WARNING: TCB hash size not a power of 2\n");
hashsize = 512; /* safe default */
tcbinfo.hashbase = hashinit(hashsize, M_PCB, &tcbinfo.hashmask);
tcbinfo.porthashbase = hashinit(hashsize, M_PCB,
&tcbinfo.porthashmask);
-#ifdef __APPLE__
str_size = (vm_size_t) sizeof(struct inp_tp);
tcbinfo.ipi_zone = (void *) zinit(str_size, 120000*str_size, 8192, "tcpcb");
-#else
- tcbinfo.ipi_zone = zinit("tcpcb", sizeof(struct inp_tp), maxsockets,
- ZONE_INTERRUPT, 0);
-#endif
+ sack_hole_zone = zinit(str_size, 120000*str_size, 8192, "sack_hole zone");
+ tcp_reass_maxseg = nmbclusters / 16;
+
#if INET6
#define TCP_MINPROTOHDR (sizeof(struct ip6_hdr) + sizeof(struct tcphdr))
#else /* INET6 */
if (max_linkhdr + TCP_MINPROTOHDR > MHLEN)
panic("tcp_init");
#undef TCP_MINPROTOHDR
- tcbinfo.last_pcb = 0;
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
+ */
+ pcbinfo->mtx_grp_attr = lck_grp_attr_alloc_init();
+ pcbinfo->mtx_grp = lck_grp_alloc_init("tcppcb", pcbinfo->mtx_grp_attr);
+
+ /*
+ * allocate the lock attribute for tcp pcb mutexes
+ */
+ pcbinfo->mtx_attr = lck_attr_alloc_init();
+
+ if ((pcbinfo->mtx = lck_rw_alloc_init(pcbinfo->mtx_grp, pcbinfo->mtx_attr)) == NULL) {
+ printf("tcp_init: mutex not alloced!\n");
+ 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);
for (i=0; i < N_TIME_WAIT_SLOTS; i++) {
LIST_INIT(&time_wait_slots[i]);
}
+
+ timeout(tcp_fasttimo, NULL, hz/TCP_RETRANSHZ);
}
/*
* 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;
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;
}
}
}
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;
}
m->m_len = tlen;
m->m_pkthdr.len = tlen;
- m->m_pkthdr.rcvif = (struct ifnet *) 0;
+ 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
+
+#if CONFIG_IP_EDGEHOLE
+ if (tp && tp->t_inpcb)
+ ip_edgehole_mbuf_tag(tp->t_inpcb, m);
+#endif
+
nth->th_seq = htonl(seq);
nth->th_ack = htonl(ack);
nth->th_x2 = 0;
#endif
#if INET6
if (isipv6) {
- (void)ip6_output(m, NULL, ro6, ipflags, NULL, NULL);
+ (void)ip6_output(m, NULL, ro6, ipflags, NULL, NULL, 0);
if (ro6 == &sro6 && ro6->ro_rt) {
rtfree(ro6->ro_rt);
ro6->ro_rt = NULL;
} else
#endif /* INET6 */
{
- (void) ip_output(m, 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;
#endif /* INET6 */
tcp_mssdflt;
-#ifndef __APPLE__
- /* Set up our timeouts. */
- callout_init(tp->tt_rexmt = &it->inp_tp_rexmt);
- callout_init(tp->tt_persist = &it->inp_tp_persist);
- callout_init(tp->tt_keep = &it->inp_tp_keep);
- callout_init(tp->tt_2msl = &it->inp_tp_2msl);
- callout_init(tp->tt_delack = &it->inp_tp_delack);
-#endif
-
if (tcp_do_rfc1323)
tp->t_flags = (TF_REQ_SCALE|TF_REQ_TSTMP);
- if (tcp_do_rfc1644)
- tp->t_flags |= TF_REQ_CC;
+ tp->sack_enable = tcp_do_sack;
+ TAILQ_INIT(&tp->snd_holes);
tp->t_inpcb = inp; /* XXX */
/*
* Init srtt to TCPTV_SRTTBASE (0), so we can tell that we have no
*/
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,
* which may match an IPv4-mapped IPv6 address.
int errno;
{
struct socket *so = tp->t_inpcb->inp_socket;
-
-#ifdef __APPLE__
- switch (tp->t_state)
- {
- case TCPS_ESTABLISHED:
- case TCPS_FIN_WAIT_1:
- case TCPS_CLOSING:
- case TCPS_CLOSE_WAIT:
- case TCPS_LAST_ACK:
- break;
- }
-#endif
if (TCPS_HAVERCVDSYN(tp->t_state)) {
tp->t_state = TCPS_CLOSED;
tcp_close(tp)
register struct tcpcb *tp;
{
- register struct tseg_qent *q;
struct inpcb *inp = tp->t_inpcb;
struct socket *so = inp->inp_socket;
#if INET6
register struct rtentry *rt;
int dosavessthresh;
-#ifndef __APPLE__
- /*
- * Make sure that all of our timers are stopped before we
- * delete the PCB.
- */
- callout_stop(tp->tt_rexmt);
- callout_stop(tp->tt_persist);
- callout_stop(tp->tt_keep);
- callout_stop(tp->tt_2msl);
- callout_stop(tp->tt_delack);
-#endif
+ if ( inp->inp_ppcb == NULL) /* tcp_close was called previously, bail */
+ return NULL;
+
+ /* Clear the timers before we delete the PCB. */
+ {
+ int i;
+ for (i = 0; i < TCPT_NTIMERS; i++) {
+ tp->t_timer[i] = 0;
+ }
+ }
KERNEL_DEBUG(DBG_FNC_TCP_CLOSE | DBG_FUNC_START, tp,0,0,0,0);
switch (tp->t_state)
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.
*/
if (tp->t_rttupdated >= 16) {
register u_long i = 0;
+
#if INET6
if (isipv6) {
struct sockaddr_in6 *sin6;
goto no_valid_rt;
}
else
-#endif /* INET6 */
- if ((rt = inp->inp_route.ro_rt) == NULL ||
+#endif /* INET6 */
+ rt = inp->inp_route.ro_rt;
+ if (rt == NULL ||
((struct sockaddr_in *)rt_key(rt))->sin_addr.s_addr
- == INADDR_ANY)
+ == INADDR_ANY || rt->generation_id != route_generation) {
+ if (tp->t_state >= TCPS_CLOSE_WAIT)
+ tp->t_state = TCPS_CLOSING;
+
goto no_valid_rt;
+ }
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
}
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;
* mark route for deletion if no information is
* cached.
*/
- if ((tp->t_flags & TF_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;
}
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;
#endif
- inp->inp_ppcb = NULL;
soisdisconnected(so);
#if INET6
if (INP_CHECK_SOCKAF(so, AF_INET6))
LIST_REMOVE(q, tqe_q);
m_freem(q->tqe_m);
FREE(q, M_TSEGQ);
+ tcp_reass_qsize--;
rv = 1;
}
return (rv);
* where we're really low on mbufs, this is potentially
* usefull.
*/
+ 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))) {
LIST_REMOVE(te, tqe_q);
m_freem(te->tqe_m);
FREE(te, M_TSEGQ);
+ tcp_reass_qsize--;
}
}
}
+ lck_rw_done(tcbinfo.mtx);
}
}
struct inpcb *inp;
int error;
{
- struct tcpcb *tp = (struct tcpcb *)inp->inp_ppcb;
+ struct tcpcb *tp;
+
+ if (inp == NULL || (inp->inp_state == INPCB_STATE_DEAD))
+ return; /* pcb is gone already */
+
+ tp = (struct tcpcb *)inp->inp_ppcb;
/*
* Ignore some errors if we are hooked up.
static int
tcp_pcblist SYSCTL_HANDLER_ARGS
{
- int error, i, n, s;
+#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.
*/
- if (req->oldptr == 0) {
+ 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 xtcpcb);
+ lck_rw_done(tcbinfo.mtx);
return 0;
}
- if (req->newptr != 0)
+ if (req->newptr != USER_ADDR_NULL) {
+ lck_rw_done(tcbinfo.mtx);
return EPERM;
+ }
/*
* OK, now we're committed to doing something.
*/
- s = splnet();
gencnt = tcbinfo.ipi_gencnt;
n = tcbinfo.ipi_count;
- splx(s);
+ 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)
+ if (error) {
+ lck_rw_done(tcbinfo.mtx);
return error;
- /*
- * We are done if there is no pcb
- */
- if (n == 0)
- 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);
- if (inp_list == 0)
+ if (inp_list == 0) {
+ lck_rw_done(tcbinfo.mtx);
return ENOMEM;
+ }
- s = splnet();
for (inp = LIST_FIRST(tcbinfo.listhead), i = 0; inp && i < n;
inp = LIST_NEXT(inp, inp_list)) {
#ifdef __APPLE__
- if (inp->inp_gencnt <= gencnt)
+ if (inp->inp_gencnt <= gencnt && inp->inp_state != INPCB_STATE_DEAD)
#else
if (inp->inp_gencnt <= gencnt && !prison_xinpcb(req->p, inp))
#endif
inp_list[i++] = inp;
}
- splx(s);
+
+ 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) {
+ if (inp->inp_gencnt <= gencnt && inp->inp_state != INPCB_STATE_DEAD) {
struct xtcpcb xt;
caddr_t inp_ppcb;
+
+ bzero(&xt, sizeof(xt));
xt.xt_len = sizeof xt;
/* XXX should avoid extra copy */
- bcopy(inp, &xt.xt_inp, sizeof *inp);
+ inpcb_to_compat(inp, &xt.xt_inp);
inp_ppcb = inp->inp_ppcb;
- if (inp_ppcb != NULL)
+ if (inp_ppcb != NULL) {
bcopy(inp_ppcb, &xt.xt_tp, sizeof xt.xt_tp);
+ }
else
bzero((char *) &xt.xt_tp, sizeof xt.xt_tp);
if (inp->inp_socket)
* while we were processing this request, and it
* might be necessary to retry.
*/
- s = splnet();
+ 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;
- splx(s);
error = SYSCTL_OUT(req, &xig, sizeof xig);
}
FREE(inp_list, M_TEMP);
+ lck_rw_done(tcbinfo.mtx);
return error;
}
error = ENOENT;
goto out;
}
- error = SYSCTL_OUT(req, inp->inp_socket->so_cred, sizeof(struct ucred));
+ error = SYSCTL_OUT(req, inp->inp_socket->so_cred, sizeof(*(kauth_cred_t)0);
out:
splx(s);
return (error);
goto out;
}
error = SYSCTL_OUT(req, inp->inp_socket->so_cred,
- sizeof(struct ucred));
+ sizeof(*(kauth_cred_t)0);
out:
splx(s);
return (error);
struct in_addr faddr;
struct inpcb *inp;
struct tcpcb *tp;
- void (*notify) __P((struct inpcb *, int)) = tcp_notify;
+ void (*notify)(struct inpcb *, int) = tcp_notify;
tcp_seq icmp_seq;
- int s;
faddr = ((struct sockaddr_in *)sa)->sin_addr;
if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
else if ((unsigned)cmd > PRC_NCMDS || inetctlerrmap[cmd] == 0)
return;
if (ip) {
- s = splnet();
th = (struct tcphdr *)((caddr_t)ip
+ (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) {
+ tcp_lock(inp->inp_socket, 1, 0);
+ if (in_pcb_checkstate(inp, WNT_RELEASE, 1) == WNT_STOPUSING) {
+ tcp_unlock(inp->inp_socket, 1, 0);
+ return;
+ }
icmp_seq = htonl(th->th_seq);
tp = intotcpcb(inp);
if (SEQ_GEQ(icmp_seq, tp->snd_una) &&
SEQ_LT(icmp_seq, tp->snd_max))
(*notify)(inp, inetctlerrmap[cmd]);
+ tcp_unlock(inp->inp_socket, 1, 0);
}
- splx(s);
} else
- in_pcbnotifyall(&tcb, faddr, inetctlerrmap[cmd], notify);
+ in_pcbnotifyall(&tcbinfo, faddr, inetctlerrmap[cmd], notify);
}
#if INET6
void *d;
{
struct tcphdr th;
- void (*notify) __P((struct inpcb *, int)) = tcp_notify;
+ void (*notify)(struct inpcb *, int) = tcp_notify;
struct ip6_hdr *ip6;
struct mbuf *m;
struct ip6ctlparam *ip6cp = NULL;
bzero(&th, sizeof(th));
m_copydata(m, off, sizeof(*thp), (caddr_t)&th);
- in6_pcbnotify(&tcb, sa, th.th_dport,
+ in6_pcbnotify(&tcbinfo, sa, th.th_dport,
(struct sockaddr *)ip6cp->ip6c_src,
th.th_sport, cmd, notify);
} else
- in6_pcbnotify(&tcb, sa, 0, (struct sockaddr *)sa6_src,
+ in6_pcbnotify(&tcbinfo, sa, 0, (struct sockaddr *)sa6_src,
0, cmd, notify);
}
#endif /* INET6 */
#define ISN_BYTES_PER_SECOND 1048576
-u_char isn_secret[32];
-int isn_last_reseed;
-MD5_CTX isn_ctx;
-
tcp_seq
tcp_new_isn(tp)
struct tcpcb *tp;
{
u_int32_t md5_buffer[4];
tcp_seq new_isn;
- struct timeval time;
+ 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))
#else
return arc4random();
#endif
+ getmicrotime(&timenow);
/* Seed if this is the first use, reseed if requested. */
if ((isn_last_reseed == 0) ||
((tcp_strict_rfc1948 == 0) && (tcp_isn_reseed_interval > 0) &&
(((u_int)isn_last_reseed + (u_int)tcp_isn_reseed_interval*hz)
- < (u_int)time.tv_sec))) {
+ < (u_int)timenow.tv_sec))) {
#ifdef __APPLE__
read_random(&isn_secret, sizeof(isn_secret));
#else
read_random_unlimited(&isn_secret, sizeof(isn_secret));
#endif
- isn_last_reseed = time.tv_sec;
+ isn_last_reseed = timenow.tv_sec;
}
/* Compute the md5 hash and return the ISN. */
MD5Update(&isn_ctx, (u_char *) &isn_secret, sizeof(isn_secret));
MD5Final((u_char *) &md5_buffer, &isn_ctx);
new_isn = (tcp_seq) md5_buffer[0];
- new_isn += time.tv_sec * (ISN_BYTES_PER_SECOND / hz);
+ new_isn += timenow.tv_sec * (ISN_BYTES_PER_SECOND / hz);
return new_isn;
}
* to one segment. We will gradually open it again as we proceed.
*/
void
-tcp_quench(inp, errno)
- struct inpcb *inp;
- int errno;
+tcp_quench(
+ struct inpcb *inp,
+ __unused int errno
+)
{
struct tcpcb *tp = intotcpcb(inp);
- if (tp)
+ if (tp) {
tp->snd_cwnd = tp->t_maxseg;
+ tp->t_bytes_acked = 0;
+ }
}
/*
* This duplicates some code in the tcp_mss() function in tcp_input.c.
*/
void
-tcp_mtudisc(inp, errno)
- struct inpcb *inp;
- int errno;
+tcp_mtudisc(
+ struct inpcb *inp,
+ __unused int errno
+)
{
struct tcpcb *tp = intotcpcb(inp);
struct rtentry *rt;
#endif /* INET6 */
if (tp) {
+ lck_mtx_lock(rt_mtx);
#if INET6
if (isipv6)
rt = tcp_rtlookup6(inp);
isipv6 ? tcp_v6mssdflt :
#endif /* INET6 */
tcp_mssdflt;
+ lck_mtx_unlock(rt_mtx);
return;
}
taop = rmx_taop(rt->rt_rmx);
#endif /* INET6 */
;
+ lck_mtx_unlock(rt_mtx);
if (offered)
mss = min(mss, offered);
/*
if ((tp->t_flags & (TF_REQ_TSTMP|TF_NOOPT)) == TF_REQ_TSTMP &&
(tp->t_flags & TF_RCVD_TSTMP) == TF_RCVD_TSTMP)
mss -= TCPOLEN_TSTAMP_APPA;
- if ((tp->t_flags & (TF_REQ_CC|TF_NOOPT)) == TF_REQ_CC &&
- (tp->t_flags & TF_RCVD_CC) == TF_RCVD_CC)
- mss -= TCPOLEN_CC_APPA;
-#if (MCLBYTES & (MCLBYTES - 1)) == 0
- if (mss > MCLBYTES)
- mss &= ~(MCLBYTES-1);
-#else
- if (mss > MCLBYTES)
- mss = mss / MCLBYTES * MCLBYTES;
-#endif
+
if (so->so_snd.sb_hiwat < mss)
mss = so->so_snd.sb_hiwat;
/*
* 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 found and it cannot be allocated then return NULL. This routine
* is called by TCP routines that access the rmx structure and by tcp_mss
* to get the interface MTU.
*/
{
struct route *ro;
struct rtentry *rt;
+ struct tcpcb *tp;
ro = &inp->inp_route;
if (ro == NULL)
return (NULL);
rt = ro->ro_rt;
- if (rt == NULL || !(rt->rt_flags & RTF_UP)) {
+
+ 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) {
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(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;
+
+#ifdef IFEF_NOWINDOWSCALE
+ if (tp->t_state == TCPS_SYN_SENT && rt != NULL && rt->rt_ifp != NULL &&
+ (rt->rt_ifp->if_eflags & IFEF_NOWINDOWSCALE) != 0)
+ {
+ // Timestamps are not enabled on this interface
+ tp->t_flags &= ~(TF_REQ_SCALE);
+ }
+#endif
+
return rt;
}
{
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;
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 */
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;
tcp_fillheaders(tp, ip, th);
hdrsiz = ipsec4_hdrsiz(m, IPSEC_DIR_OUTBOUND, inp);
}
-
m_free(m);
return hdrsiz;
}
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);
/* 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);
}
/*
tcp_cleartaocache()
{
}
+
+int
+tcp_lock(so, refcount, lr)
+ struct socket *so;
+ int refcount;
+ int lr;
+{
+ int lr_saved;
+ if (lr == 0)
+ lr_saved = (unsigned int) __builtin_return_address(0);
+ else lr_saved = lr;
+
+ if (so->so_pcb) {
+ 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);
+ }
+
+ 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 (refcount)
+ so->so_usecount++;
+ 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);
+}
+
+int
+tcp_unlock(so, refcount, lr)
+ struct socket *so;
+ int refcount;
+ int lr;
+{
+ int lr_saved;
+ if (lr == 0)
+ lr_saved = (unsigned int) __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);
+#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;
+ so->next_unlock_lr = (so->next_unlock_lr+1) % SO_LCKDBG_MAX;
+ lck_mtx_unlock(((struct inpcb *)so->so_pcb)->inpcb_mtx);
+ }
+ return (0);
+}
+
+lck_mtx_t *
+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=%p usecount=%x\n", so, so->so_usecount);
+ return(inp->inpcb_mtx);
+ }
+ else {
+ 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 */
projects / apple / xnu.git / blobdiff