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freebsd-dev/sys/netinet/tcp_usrreq.c
Randall Stewart 08af8aac2a Tcp progress timeout 
Rack has had the ability to timeout connections that just sit idle automatically. This
feature of course is off by default and requires the user set it on (though the socket option
has been missing in tcp_usrreq.c). Lets get the progress timeout fully supported in
the base stack as well as rack.

Reviewed by: tuexen
Sponsored by: Netflix Inc
Differential Revision: https://reviews.freebsd.org/D36716
2022-09-27 13:38:20 -04:00

3236 lines
78 KiB
C
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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1982, 1986, 1988, 1993
* The Regents of the University of California.
* Copyright (c) 2006-2007 Robert N. M. Watson
* Copyright (c) 2010-2011 Juniper Networks, Inc.
* All rights reserved.
*
* Portions of this software were developed by Robert N. M. Watson under
* contract to Juniper Networks, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* From: @(#)tcp_usrreq.c 8.2 (Berkeley) 1/3/94
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_ddb.h"
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_ipsec.h"
#include "opt_kern_tls.h"
#include "opt_tcpdebug.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/arb.h>
#include <sys/limits.h>
#include <sys/malloc.h>
#include <sys/refcount.h>
#include <sys/kernel.h>
#include <sys/ktls.h>
#include <sys/qmath.h>
#include <sys/sysctl.h>
#include <sys/mbuf.h>
#ifdef INET6
#include <sys/domain.h>
#endif /* INET6 */
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/protosw.h>
#include <sys/proc.h>
#include <sys/jail.h>
#include <sys/stats.h>
#ifdef DDB
#include <ddb/ddb.h>
#endif
#include <net/if.h>
#include <net/if_var.h>
#include <net/route.h>
#include <net/vnet.h>
#include <netinet/in.h>
#include <netinet/in_kdtrace.h>
#include <netinet/in_pcb.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#ifdef INET6
#include <netinet/ip6.h>
#include <netinet6/in6_pcb.h>
#include <netinet6/ip6_var.h>
#include <netinet6/scope6_var.h>
#endif
#include <netinet/tcp.h>
#include <netinet/tcp_fsm.h>
#include <netinet/tcp_seq.h>
#include <netinet/tcp_timer.h>
#include <netinet/tcp_var.h>
#include <netinet/tcp_log_buf.h>
#include <netinet/tcpip.h>
#include <netinet/cc/cc.h>
#include <netinet/tcp_fastopen.h>
#include <netinet/tcp_hpts.h>
#ifdef TCPPCAP
#include <netinet/tcp_pcap.h>
#endif
#include <netinet/tcp_debug.h>
#ifdef TCP_OFFLOAD
#include <netinet/tcp_offload.h>
#endif
#include <netipsec/ipsec_support.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/pmap.h>
#include <vm/vm_extern.h>
#include <vm/vm_map.h>
#include <vm/vm_page.h>
/*
* TCP protocol interface to socket abstraction.
*/
#ifdef INET
static int tcp_connect(struct tcpcb *, struct sockaddr *,
struct thread *td);
#endif /* INET */
#ifdef INET6
static int tcp6_connect(struct tcpcb *, struct sockaddr *,
struct thread *td);
#endif /* INET6 */
static void tcp_disconnect(struct tcpcb *);
static void tcp_usrclosed(struct tcpcb *);
static void tcp_fill_info(struct tcpcb *, struct tcp_info *);
static int tcp_pru_options_support(struct tcpcb *tp, int flags);
#ifdef TCPDEBUG
#define TCPDEBUG0 int ostate = 0
#define TCPDEBUG1() ostate = tp ? tp->t_state : 0
#define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \
tcp_trace(TA_USER, ostate, tp, 0, 0, req)
#else
#define TCPDEBUG0
#define TCPDEBUG1()
#define TCPDEBUG2(req)
#endif
/*
* tcp_require_unique port requires a globally-unique source port for each
* outgoing connection. The default is to require the 4-tuple to be unique.
*/
VNET_DEFINE(int, tcp_require_unique_port) = 0;
SYSCTL_INT(_net_inet_tcp, OID_AUTO, require_unique_port,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(tcp_require_unique_port), 0,
"Require globally-unique ephemeral port for outgoing connections");
#define V_tcp_require_unique_port VNET(tcp_require_unique_port)
/*
* TCP attaches to socket via pru_attach(), reserving space,
* and an internet control block.
*/
static int
tcp_usr_attach(struct socket *so, int proto, struct thread *td)
{
struct inpcb *inp;
struct tcpcb *tp = NULL;
int error;
TCPDEBUG0;
inp = sotoinpcb(so);
KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL"));
TCPDEBUG1();
error = soreserve(so, V_tcp_sendspace, V_tcp_recvspace);
if (error)
goto out;
so->so_rcv.sb_flags |= SB_AUTOSIZE;
so->so_snd.sb_flags |= SB_AUTOSIZE;
error = in_pcballoc(so, &V_tcbinfo);
if (error)
goto out;
inp = sotoinpcb(so);
tp = tcp_newtcpcb(inp);
if (tp == NULL) {
error = ENOBUFS;
in_pcbdetach(inp);
in_pcbfree(inp);
goto out;
}
tp->t_state = TCPS_CLOSED;
INP_WUNLOCK(inp);
TCPSTATES_INC(TCPS_CLOSED);
out:
TCPDEBUG2(PRU_ATTACH);
TCP_PROBE2(debug__user, tp, PRU_ATTACH);
return (error);
}
/*
* tcp_usr_detach is called when the socket layer loses its final reference
* to the socket, be it a file descriptor reference, a reference from TCP,
* etc. At this point, there is only one case in which we will keep around
* inpcb state: time wait.
*/
static void
tcp_usr_detach(struct socket *so)
{
struct inpcb *inp;
struct tcpcb *tp;
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
INP_WLOCK(inp);
KASSERT(so->so_pcb == inp && inp->inp_socket == so,
("%s: socket %p inp %p mismatch", __func__, so, inp));
tp = intotcpcb(inp);
if (inp->inp_flags & INP_TIMEWAIT) {
/*
* There are two cases to handle: one in which the time wait
* state is being discarded (INP_DROPPED), and one in which
* this connection will remain in timewait. In the former,
* it is time to discard all state (except tcptw, which has
* already been discarded by the timewait close code, which
* should be further up the call stack somewhere). In the
* latter case, we detach from the socket, but leave the pcb
* present until timewait ends.
*
* XXXRW: Would it be cleaner to free the tcptw here?
*
* Astute question indeed, from twtcp perspective there are
* four cases to consider:
*
* #1 tcp_usr_detach is called at tcptw creation time by
* tcp_twstart, then do not discard the newly created tcptw
* and leave inpcb present until timewait ends
* #2 tcp_usr_detach is called at tcptw creation time by
* tcp_twstart, but connection is local and tw will be
* discarded immediately
* #3 tcp_usr_detach is called at timewait end (or reuse) by
* tcp_twclose, then the tcptw has already been discarded
* (or reused) and inpcb is freed here
* #4 tcp_usr_detach is called() after timewait ends (or reuse)
* (e.g. by soclose), then tcptw has already been discarded
* (or reused) and inpcb is freed here
*
* In all three cases the tcptw should not be freed here.
*/
if (inp->inp_flags & INP_DROPPED) {
KASSERT(tp == NULL, ("tcp_detach: INP_TIMEWAIT && "
"INP_DROPPED && tp != NULL"));
in_pcbdetach(inp);
in_pcbfree(inp);
} else {
in_pcbdetach(inp);
INP_WUNLOCK(inp);
}
} else {
/*
* If the connection is not in timewait, it must be either
* dropped or embryonic.
*/
KASSERT(inp->inp_flags & INP_DROPPED ||
tp->t_state < TCPS_SYN_SENT,
("%s: inp %p not dropped or embryonic", __func__, inp));
tcp_discardcb(tp);
in_pcbdetach(inp);
in_pcbfree(inp);
}
}
#ifdef INET
/*
* Give the socket an address.
*/
static int
tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
{
int error = 0;
struct inpcb *inp;
#ifdef KDTRACE_HOOKS
struct tcpcb *tp = NULL;
#endif
struct sockaddr_in *sinp;
sinp = (struct sockaddr_in *)nam;
if (nam->sa_family != AF_INET) {
/*
* Preserve compatibility with old programs.
*/
if (nam->sa_family != AF_UNSPEC ||
nam->sa_len < offsetof(struct sockaddr_in, sin_zero) ||
sinp->sin_addr.s_addr != INADDR_ANY)
return (EAFNOSUPPORT);
nam->sa_family = AF_INET;
}
if (nam->sa_len != sizeof(*sinp))
return (EINVAL);
/*
* Must check for multicast addresses and disallow binding
* to them.
*/
if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
return (EAFNOSUPPORT);
TCPDEBUG0;
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL"));
INP_WLOCK(inp);
if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
error = EINVAL;
goto out;
}
#ifdef KDTRACE_HOOKS
tp = intotcpcb(inp);
#endif
TCPDEBUG1();
INP_HASH_WLOCK(&V_tcbinfo);
error = in_pcbbind(inp, nam, td->td_ucred);
INP_HASH_WUNLOCK(&V_tcbinfo);
out:
TCPDEBUG2(PRU_BIND);
TCP_PROBE2(debug__user, tp, PRU_BIND);
INP_WUNLOCK(inp);
return (error);
}
#endif /* INET */
#ifdef INET6
static int
tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
{
int error = 0;
struct inpcb *inp;
#ifdef KDTRACE_HOOKS
struct tcpcb *tp = NULL;
#endif
struct sockaddr_in6 *sin6;
u_char vflagsav;
sin6 = (struct sockaddr_in6 *)nam;
if (nam->sa_family != AF_INET6)
return (EAFNOSUPPORT);
if (nam->sa_len != sizeof(*sin6))
return (EINVAL);
/*
* Must check for multicast addresses and disallow binding
* to them.
*/
if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
return (EAFNOSUPPORT);
TCPDEBUG0;
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL"));
INP_WLOCK(inp);
vflagsav = inp->inp_vflag;
if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
error = EINVAL;
goto out;
}
#ifdef KDTRACE_HOOKS
tp = intotcpcb(inp);
#endif
TCPDEBUG1();
INP_HASH_WLOCK(&V_tcbinfo);
inp->inp_vflag &= ~INP_IPV4;
inp->inp_vflag |= INP_IPV6;
#ifdef INET
if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
inp->inp_vflag |= INP_IPV4;
else if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
struct sockaddr_in sin;
in6_sin6_2_sin(&sin, sin6);
if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
error = EAFNOSUPPORT;
INP_HASH_WUNLOCK(&V_tcbinfo);
goto out;
}
inp->inp_vflag |= INP_IPV4;
inp->inp_vflag &= ~INP_IPV6;
error = in_pcbbind(inp, (struct sockaddr *)&sin,
td->td_ucred);
INP_HASH_WUNLOCK(&V_tcbinfo);
goto out;
}
}
#endif
error = in6_pcbbind(inp, nam, td->td_ucred);
INP_HASH_WUNLOCK(&V_tcbinfo);
out:
if (error != 0)
inp->inp_vflag = vflagsav;
TCPDEBUG2(PRU_BIND);
TCP_PROBE2(debug__user, tp, PRU_BIND);
INP_WUNLOCK(inp);
return (error);
}
#endif /* INET6 */
#ifdef INET
/*
* Prepare to accept connections.
*/
static int
tcp_usr_listen(struct socket *so, int backlog, struct thread *td)
{
int error = 0;
struct inpcb *inp;
struct tcpcb *tp = NULL;
TCPDEBUG0;
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL"));
INP_WLOCK(inp);
if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
error = EINVAL;
goto out;
}
tp = intotcpcb(inp);
TCPDEBUG1();
SOCK_LOCK(so);
error = solisten_proto_check(so);
if (error != 0) {
SOCK_UNLOCK(so);
goto out;
}
if (inp->inp_lport == 0) {
INP_HASH_WLOCK(&V_tcbinfo);
error = in_pcbbind(inp, NULL, td->td_ucred);
INP_HASH_WUNLOCK(&V_tcbinfo);
}
if (error == 0) {
tcp_state_change(tp, TCPS_LISTEN);
solisten_proto(so, backlog);
#ifdef TCP_OFFLOAD
if ((so->so_options & SO_NO_OFFLOAD) == 0)
tcp_offload_listen_start(tp);
#endif
} else {
solisten_proto_abort(so);
}
SOCK_UNLOCK(so);
if (IS_FASTOPEN(tp->t_flags))
tp->t_tfo_pending = tcp_fastopen_alloc_counter();
out:
TCPDEBUG2(PRU_LISTEN);
TCP_PROBE2(debug__user, tp, PRU_LISTEN);
INP_WUNLOCK(inp);
return (error);
}
#endif /* INET */
#ifdef INET6
static int
tcp6_usr_listen(struct socket *so, int backlog, struct thread *td)
{
int error = 0;
struct inpcb *inp;
struct tcpcb *tp = NULL;
u_char vflagsav;
TCPDEBUG0;
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL"));
INP_WLOCK(inp);
if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
error = EINVAL;
goto out;
}
vflagsav = inp->inp_vflag;
tp = intotcpcb(inp);
TCPDEBUG1();
SOCK_LOCK(so);
error = solisten_proto_check(so);
if (error != 0) {
SOCK_UNLOCK(so);
goto out;
}
INP_HASH_WLOCK(&V_tcbinfo);
if (inp->inp_lport == 0) {
inp->inp_vflag &= ~INP_IPV4;
if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
inp->inp_vflag |= INP_IPV4;
error = in6_pcbbind(inp, NULL, td->td_ucred);
}
INP_HASH_WUNLOCK(&V_tcbinfo);
if (error == 0) {
tcp_state_change(tp, TCPS_LISTEN);
solisten_proto(so, backlog);
#ifdef TCP_OFFLOAD
if ((so->so_options & SO_NO_OFFLOAD) == 0)
tcp_offload_listen_start(tp);
#endif
} else {
solisten_proto_abort(so);
}
SOCK_UNLOCK(so);
if (IS_FASTOPEN(tp->t_flags))
tp->t_tfo_pending = tcp_fastopen_alloc_counter();
if (error != 0)
inp->inp_vflag = vflagsav;
out:
TCPDEBUG2(PRU_LISTEN);
TCP_PROBE2(debug__user, tp, PRU_LISTEN);
INP_WUNLOCK(inp);
return (error);
}
#endif /* INET6 */
#ifdef INET
/*
* Initiate connection to peer.
* Create a template for use in transmissions on this connection.
* Enter SYN_SENT state, and mark socket as connecting.
* Start keep-alive timer, and seed output sequence space.
* Send initial segment on connection.
*/
static int
tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
{
struct epoch_tracker et;
int error = 0;
struct inpcb *inp;
struct tcpcb *tp = NULL;
struct sockaddr_in *sinp;
sinp = (struct sockaddr_in *)nam;
if (nam->sa_family != AF_INET)
return (EAFNOSUPPORT);
if (nam->sa_len != sizeof (*sinp))
return (EINVAL);
/*
* Must disallow TCP ``connections'' to multicast addresses.
*/
if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
return (EAFNOSUPPORT);
if (ntohl(sinp->sin_addr.s_addr) == INADDR_BROADCAST)
return (EACCES);
if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0)
return (error);
TCPDEBUG0;
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL"));
INP_WLOCK(inp);
if (inp->inp_flags & INP_TIMEWAIT) {
error = EADDRINUSE;
goto out;
}
if (inp->inp_flags & INP_DROPPED) {
error = ECONNREFUSED;
goto out;
}
if (SOLISTENING(so)) {
error = EOPNOTSUPP;
goto out;
}
tp = intotcpcb(inp);
TCPDEBUG1();
NET_EPOCH_ENTER(et);
if ((error = tcp_connect(tp, nam, td)) != 0)
goto out_in_epoch;
#ifdef TCP_OFFLOAD
if (registered_toedevs > 0 &&
(so->so_options & SO_NO_OFFLOAD) == 0 &&
(error = tcp_offload_connect(so, nam)) == 0)
goto out_in_epoch;
#endif
tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp));
error = tcp_output(tp);
KASSERT(error >= 0, ("TCP stack %s requested tcp_drop(%p) at connect()"
", error code %d", tp->t_fb->tfb_tcp_block_name, tp, -error));
out_in_epoch:
NET_EPOCH_EXIT(et);
out:
TCPDEBUG2(PRU_CONNECT);
TCP_PROBE2(debug__user, tp, PRU_CONNECT);
INP_WUNLOCK(inp);
return (error);
}
#endif /* INET */
#ifdef INET6
static int
tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
{
struct epoch_tracker et;
int error = 0;
struct inpcb *inp;
struct tcpcb *tp = NULL;
struct sockaddr_in6 *sin6;
u_int8_t incflagsav;
u_char vflagsav;
TCPDEBUG0;
sin6 = (struct sockaddr_in6 *)nam;
if (nam->sa_family != AF_INET6)
return (EAFNOSUPPORT);
if (nam->sa_len != sizeof (*sin6))
return (EINVAL);
/*
* Must disallow TCP ``connections'' to multicast addresses.
*/
if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
return (EAFNOSUPPORT);
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL"));
INP_WLOCK(inp);
vflagsav = inp->inp_vflag;
incflagsav = inp->inp_inc.inc_flags;
if (inp->inp_flags & INP_TIMEWAIT) {
error = EADDRINUSE;
goto out;
}
if (inp->inp_flags & INP_DROPPED) {
error = ECONNREFUSED;
goto out;
}
if (SOLISTENING(so)) {
error = EINVAL;
goto out;
}
tp = intotcpcb(inp);
TCPDEBUG1();
#ifdef INET
/*
* XXXRW: Some confusion: V4/V6 flags relate to binding, and
* therefore probably require the hash lock, which isn't held here.
* Is this a significant problem?
*/
if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
struct sockaddr_in sin;
if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
error = EINVAL;
goto out;
}
if ((inp->inp_vflag & INP_IPV4) == 0) {
error = EAFNOSUPPORT;
goto out;
}
in6_sin6_2_sin(&sin, sin6);
if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
error = EAFNOSUPPORT;
goto out;
}
if (ntohl(sin.sin_addr.s_addr) == INADDR_BROADCAST) {
error = EACCES;
goto out;
}
if ((error = prison_remote_ip4(td->td_ucred,
&sin.sin_addr)) != 0)
goto out;
inp->inp_vflag |= INP_IPV4;
inp->inp_vflag &= ~INP_IPV6;
NET_EPOCH_ENTER(et);
if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0)
goto out_in_epoch;
#ifdef TCP_OFFLOAD
if (registered_toedevs > 0 &&
(so->so_options & SO_NO_OFFLOAD) == 0 &&
(error = tcp_offload_connect(so, nam)) == 0)
goto out_in_epoch;
#endif
error = tcp_output(tp);
goto out_in_epoch;
} else {
if ((inp->inp_vflag & INP_IPV6) == 0) {
error = EAFNOSUPPORT;
goto out;
}
}
#endif
if ((error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr)) != 0)
goto out;
inp->inp_vflag &= ~INP_IPV4;
inp->inp_vflag |= INP_IPV6;
inp->inp_inc.inc_flags |= INC_ISIPV6;
NET_EPOCH_ENTER(et);
if ((error = tcp6_connect(tp, nam, td)) != 0)
goto out_in_epoch;
#ifdef TCP_OFFLOAD
if (registered_toedevs > 0 &&
(so->so_options & SO_NO_OFFLOAD) == 0 &&
(error = tcp_offload_connect(so, nam)) == 0)
goto out_in_epoch;
#endif
tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp));
error = tcp_output(tp);
out_in_epoch:
NET_EPOCH_EXIT(et);
out:
KASSERT(error >= 0, ("TCP stack %s requested tcp_drop(%p) at connect()"
", error code %d", tp->t_fb->tfb_tcp_block_name, tp, -error));
/*
* If the implicit bind in the connect call fails, restore
* the flags we modified.
*/
if (error != 0 && inp->inp_lport == 0) {
inp->inp_vflag = vflagsav;
inp->inp_inc.inc_flags = incflagsav;
}
TCPDEBUG2(PRU_CONNECT);
TCP_PROBE2(debug__user, tp, PRU_CONNECT);
INP_WUNLOCK(inp);
return (error);
}
#endif /* INET6 */
/*
* Initiate disconnect from peer.
* If connection never passed embryonic stage, just drop;
* else if don't need to let data drain, then can just drop anyways,
* else have to begin TCP shutdown process: mark socket disconnecting,
* drain unread data, state switch to reflect user close, and
* send segment (e.g. FIN) to peer. Socket will be really disconnected
* when peer sends FIN and acks ours.
*
* SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
*/
static int
tcp_usr_disconnect(struct socket *so)
{
struct inpcb *inp;
struct tcpcb *tp = NULL;
struct epoch_tracker et;
int error = 0;
TCPDEBUG0;
NET_EPOCH_ENTER(et);
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL"));
INP_WLOCK(inp);
if (inp->inp_flags & INP_TIMEWAIT)
goto out;
if (inp->inp_flags & INP_DROPPED) {
error = ECONNRESET;
goto out;
}
tp = intotcpcb(inp);
TCPDEBUG1();
tcp_disconnect(tp);
out:
TCPDEBUG2(PRU_DISCONNECT);
TCP_PROBE2(debug__user, tp, PRU_DISCONNECT);
INP_WUNLOCK(inp);
NET_EPOCH_EXIT(et);
return (error);
}
#ifdef INET
/*
* Accept a connection. Essentially all the work is done at higher levels;
* just return the address of the peer, storing through addr.
*/
static int
tcp_usr_accept(struct socket *so, struct sockaddr **nam)
{
int error = 0;
struct inpcb *inp = NULL;
#ifdef KDTRACE_HOOKS
struct tcpcb *tp = NULL;
#endif
struct in_addr addr;
in_port_t port = 0;
TCPDEBUG0;
if (so->so_state & SS_ISDISCONNECTED)
return (ECONNABORTED);
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL"));
INP_WLOCK(inp);
if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
error = ECONNABORTED;
goto out;
}
#ifdef KDTRACE_HOOKS
tp = intotcpcb(inp);
#endif
TCPDEBUG1();
/*
* We inline in_getpeeraddr and COMMON_END here, so that we can
* copy the data of interest and defer the malloc until after we
* release the lock.
*/
port = inp->inp_fport;
addr = inp->inp_faddr;
out:
TCPDEBUG2(PRU_ACCEPT);
TCP_PROBE2(debug__user, tp, PRU_ACCEPT);
INP_WUNLOCK(inp);
if (error == 0)
*nam = in_sockaddr(port, &addr);
return error;
}
#endif /* INET */
#ifdef INET6
static int
tcp6_usr_accept(struct socket *so, struct sockaddr **nam)
{
struct inpcb *inp = NULL;
int error = 0;
#ifdef KDTRACE_HOOKS
struct tcpcb *tp = NULL;
#endif
struct in_addr addr;
struct in6_addr addr6;
struct epoch_tracker et;
in_port_t port = 0;
int v4 = 0;
TCPDEBUG0;
if (so->so_state & SS_ISDISCONNECTED)
return (ECONNABORTED);
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL"));
NET_EPOCH_ENTER(et);
INP_WLOCK(inp);
if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
error = ECONNABORTED;
goto out;
}
#ifdef KDTRACE_HOOKS
tp = intotcpcb(inp);
#endif
TCPDEBUG1();
/*
* We inline in6_mapped_peeraddr and COMMON_END here, so that we can
* copy the data of interest and defer the malloc until after we
* release the lock.
*/
if (inp->inp_vflag & INP_IPV4) {
v4 = 1;
port = inp->inp_fport;
addr = inp->inp_faddr;
} else {
port = inp->inp_fport;
addr6 = inp->in6p_faddr;
}
out:
TCPDEBUG2(PRU_ACCEPT);
TCP_PROBE2(debug__user, tp, PRU_ACCEPT);
INP_WUNLOCK(inp);
NET_EPOCH_EXIT(et);
if (error == 0) {
if (v4)
*nam = in6_v4mapsin6_sockaddr(port, &addr);
else
*nam = in6_sockaddr(port, &addr6);
}
return error;
}
#endif /* INET6 */
/*
* Mark the connection as being incapable of further output.
*/
static int
tcp_usr_shutdown(struct socket *so)
{
int error = 0;
struct inpcb *inp;
struct tcpcb *tp = NULL;
struct epoch_tracker et;
TCPDEBUG0;
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("inp == NULL"));
INP_WLOCK(inp);
if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
INP_WUNLOCK(inp);
return (ECONNRESET);
}
tp = intotcpcb(inp);
NET_EPOCH_ENTER(et);
TCPDEBUG1();
socantsendmore(so);
tcp_usrclosed(tp);
if (!(inp->inp_flags & INP_DROPPED))
error = tcp_output_nodrop(tp);
TCPDEBUG2(PRU_SHUTDOWN);
TCP_PROBE2(debug__user, tp, PRU_SHUTDOWN);
error = tcp_unlock_or_drop(tp, error);
NET_EPOCH_EXIT(et);
return (error);
}
/*
* After a receive, possibly send window update to peer.
*/
static int
tcp_usr_rcvd(struct socket *so, int flags)
{
struct epoch_tracker et;
struct inpcb *inp;
struct tcpcb *tp = NULL;
int outrv = 0, error = 0;
TCPDEBUG0;
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL"));
INP_WLOCK(inp);
if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
INP_WUNLOCK(inp);
return (ECONNRESET);
}
tp = intotcpcb(inp);
NET_EPOCH_ENTER(et);
TCPDEBUG1();
/*
* For passively-created TFO connections, don't attempt a window
* update while still in SYN_RECEIVED as this may trigger an early
* SYN|ACK. It is preferable to have the SYN|ACK be sent along with
* application response data, or failing that, when the DELACK timer
* expires.
*/
if (IS_FASTOPEN(tp->t_flags) &&
(tp->t_state == TCPS_SYN_RECEIVED))
goto out;
#ifdef TCP_OFFLOAD
if (tp->t_flags & TF_TOE)
tcp_offload_rcvd(tp);
else
#endif
outrv = tcp_output_nodrop(tp);
out:
TCPDEBUG2(PRU_RCVD);
TCP_PROBE2(debug__user, tp, PRU_RCVD);
(void) tcp_unlock_or_drop(tp, outrv);
NET_EPOCH_EXIT(et);
return (error);
}
/*
* Do a send by putting data in output queue and updating urgent
* marker if URG set. Possibly send more data. Unlike the other
* pru_*() routines, the mbuf chains are our responsibility. We
* must either enqueue them or free them. The other pru_* routines
* generally are caller-frees.
*/
static int
tcp_usr_send(struct socket *so, int flags, struct mbuf *m,
struct sockaddr *nam, struct mbuf *control, struct thread *td)
{
struct epoch_tracker et;
int error = 0;
struct inpcb *inp;
struct tcpcb *tp = NULL;
#ifdef INET
#ifdef INET6
struct sockaddr_in sin;
#endif
struct sockaddr_in *sinp;
#endif
#ifdef INET6
int isipv6;
#endif
u_int8_t incflagsav;
u_char vflagsav;
bool restoreflags;
TCPDEBUG0;
if (control != NULL) {
/* TCP doesn't do control messages (rights, creds, etc) */
if (control->m_len) {
m_freem(control);
return (EINVAL);
}
m_freem(control); /* empty control, just free it */
}
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL"));
INP_WLOCK(inp);
if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
if (m != NULL && (flags & PRUS_NOTREADY) == 0)
m_freem(m);
INP_WUNLOCK(inp);
return (ECONNRESET);
}
vflagsav = inp->inp_vflag;
incflagsav = inp->inp_inc.inc_flags;
restoreflags = false;
tp = intotcpcb(inp);
NET_EPOCH_ENTER(et);
if ((flags & PRUS_OOB) != 0 &&
(error = tcp_pru_options_support(tp, PRUS_OOB)) != 0)
goto out;
TCPDEBUG1();
if (nam != NULL && tp->t_state < TCPS_SYN_SENT) {
if (tp->t_state == TCPS_LISTEN) {
error = EINVAL;
goto out;
}
switch (nam->sa_family) {
#ifdef INET
case AF_INET:
sinp = (struct sockaddr_in *)nam;
if (sinp->sin_len != sizeof(struct sockaddr_in)) {
error = EINVAL;
goto out;
}
if ((inp->inp_vflag & INP_IPV6) != 0) {
error = EAFNOSUPPORT;
goto out;
}
if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
error = EAFNOSUPPORT;
goto out;
}
if (ntohl(sinp->sin_addr.s_addr) == INADDR_BROADCAST) {
error = EACCES;
goto out;
}
if ((error = prison_remote_ip4(td->td_ucred,
&sinp->sin_addr)))
goto out;
#ifdef INET6
isipv6 = 0;
#endif
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
{
struct sockaddr_in6 *sin6;
sin6 = (struct sockaddr_in6 *)nam;
if (sin6->sin6_len != sizeof(*sin6)) {
error = EINVAL;
goto out;
}
if ((inp->inp_vflag & INP_IPV6PROTO) == 0) {
error = EAFNOSUPPORT;
goto out;
}
if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
error = EAFNOSUPPORT;
goto out;
}
if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
#ifdef INET
if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
error = EINVAL;
goto out;
}
if ((inp->inp_vflag & INP_IPV4) == 0) {
error = EAFNOSUPPORT;
goto out;
}
restoreflags = true;
inp->inp_vflag &= ~INP_IPV6;
sinp = &sin;
in6_sin6_2_sin(sinp, sin6);
if (IN_MULTICAST(
ntohl(sinp->sin_addr.s_addr))) {
error = EAFNOSUPPORT;
goto out;
}
if ((error = prison_remote_ip4(td->td_ucred,
&sinp->sin_addr)))
goto out;
isipv6 = 0;
#else /* !INET */
error = EAFNOSUPPORT;
goto out;
#endif /* INET */
} else {
if ((inp->inp_vflag & INP_IPV6) == 0) {
error = EAFNOSUPPORT;
goto out;
}
restoreflags = true;
inp->inp_vflag &= ~INP_IPV4;
inp->inp_inc.inc_flags |= INC_ISIPV6;
if ((error = prison_remote_ip6(td->td_ucred,
&sin6->sin6_addr)))
goto out;
isipv6 = 1;
}
break;
}
#endif /* INET6 */
default:
error = EAFNOSUPPORT;
goto out;
}
}
if (!(flags & PRUS_OOB)) {
if (tp->t_acktime == 0)
tp->t_acktime = ticks;
sbappendstream(&so->so_snd, m, flags);
m = NULL;
if (nam && tp->t_state < TCPS_SYN_SENT) {
KASSERT(tp->t_state == TCPS_CLOSED,
("%s: tp %p is listening", __func__, tp));
/*
* Do implied connect if not yet connected,
* initialize window to default value, and
* initialize maxseg using peer's cached MSS.
*/
#ifdef INET6
if (isipv6)
error = tcp6_connect(tp, nam, td);
#endif /* INET6 */
#if defined(INET6) && defined(INET)
else
#endif
#ifdef INET
error = tcp_connect(tp,
(struct sockaddr *)sinp, td);
#endif
/*
* The bind operation in tcp_connect succeeded. We
* no longer want to restore the flags if later
* operations fail.
*/
if (error == 0 || inp->inp_lport != 0)
restoreflags = false;
if (error) {
/* m is freed if PRUS_NOTREADY is unset. */
sbflush(&so->so_snd);
goto out;
}
if (IS_FASTOPEN(tp->t_flags))
tcp_fastopen_connect(tp);
else {
tp->snd_wnd = TTCP_CLIENT_SND_WND;
tcp_mss(tp, -1);
}
}
if (flags & PRUS_EOF) {
/*
* Close the send side of the connection after
* the data is sent.
*/
socantsendmore(so);
tcp_usrclosed(tp);
}
if (TCPS_HAVEESTABLISHED(tp->t_state) &&
((tp->t_flags2 & TF2_FBYTES_COMPLETE) == 0) &&
(tp->t_fbyte_out == 0) &&
(so->so_snd.sb_ccc > 0)) {
tp->t_fbyte_out = ticks;
if (tp->t_fbyte_out == 0)
tp->t_fbyte_out = 1;
if (tp->t_fbyte_out && tp->t_fbyte_in)
tp->t_flags2 |= TF2_FBYTES_COMPLETE;
}
if (!(inp->inp_flags & INP_DROPPED) &&
!(flags & PRUS_NOTREADY)) {
if (flags & PRUS_MORETOCOME)
tp->t_flags |= TF_MORETOCOME;
error = tcp_output_nodrop(tp);
if (flags & PRUS_MORETOCOME)
tp->t_flags &= ~TF_MORETOCOME;
}
} else {
/*
* XXXRW: PRUS_EOF not implemented with PRUS_OOB?
*/
SOCKBUF_LOCK(&so->so_snd);
if (sbspace(&so->so_snd) < -512) {
SOCKBUF_UNLOCK(&so->so_snd);
error = ENOBUFS;
goto out;
}
/*
* According to RFC961 (Assigned Protocols),
* the urgent pointer points to the last octet
* of urgent data. We continue, however,
* to consider it to indicate the first octet
* of data past the urgent section.
* Otherwise, snd_up should be one lower.
*/
if (tp->t_acktime == 0)
tp->t_acktime = ticks;
sbappendstream_locked(&so->so_snd, m, flags);
SOCKBUF_UNLOCK(&so->so_snd);
m = NULL;
if (nam && tp->t_state < TCPS_SYN_SENT) {
/*
* Do implied connect if not yet connected,
* initialize window to default value, and
* initialize maxseg using peer's cached MSS.
*/
/*
* Not going to contemplate SYN|URG
*/
if (IS_FASTOPEN(tp->t_flags))
tp->t_flags &= ~TF_FASTOPEN;
#ifdef INET6
if (isipv6)
error = tcp6_connect(tp, nam, td);
#endif /* INET6 */
#if defined(INET6) && defined(INET)
else
#endif
#ifdef INET
error = tcp_connect(tp,
(struct sockaddr *)sinp, td);
#endif
/*
* The bind operation in tcp_connect succeeded. We
* no longer want to restore the flags if later
* operations fail.
*/
if (error == 0 || inp->inp_lport != 0)
restoreflags = false;
if (error != 0) {
/* m is freed if PRUS_NOTREADY is unset. */
sbflush(&so->so_snd);
goto out;
}
tp->snd_wnd = TTCP_CLIENT_SND_WND;
tcp_mss(tp, -1);
}
tp->snd_up = tp->snd_una + sbavail(&so->so_snd);
if ((flags & PRUS_NOTREADY) == 0) {
tp->t_flags |= TF_FORCEDATA;
error = tcp_output_nodrop(tp);
tp->t_flags &= ~TF_FORCEDATA;
}
}
TCP_LOG_EVENT(tp, NULL,
&inp->inp_socket->so_rcv,
&inp->inp_socket->so_snd,
TCP_LOG_USERSEND, error,
0, NULL, false);
out:
/*
* In case of PRUS_NOTREADY, the caller or tcp_usr_ready() is
* responsible for freeing memory.
*/
if (m != NULL && (flags & PRUS_NOTREADY) == 0)
m_freem(m);
/*
* If the request was unsuccessful and we changed flags,
* restore the original flags.
*/
if (error != 0 && restoreflags) {
inp->inp_vflag = vflagsav;
inp->inp_inc.inc_flags = incflagsav;
}
TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB :
((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
TCP_PROBE2(debug__user, tp, (flags & PRUS_OOB) ? PRU_SENDOOB :
((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
error = tcp_unlock_or_drop(tp, error);
NET_EPOCH_EXIT(et);
return (error);
}
static int
tcp_usr_ready(struct socket *so, struct mbuf *m, int count)
{
struct epoch_tracker et;
struct inpcb *inp;
struct tcpcb *tp;
int error;
inp = sotoinpcb(so);
INP_WLOCK(inp);
if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
INP_WUNLOCK(inp);
mb_free_notready(m, count);
return (ECONNRESET);
}
tp = intotcpcb(inp);
SOCKBUF_LOCK(&so->so_snd);
error = sbready(&so->so_snd, m, count);
SOCKBUF_UNLOCK(&so->so_snd);
if (error) {
INP_WUNLOCK(inp);
return (error);
}
NET_EPOCH_ENTER(et);
error = tcp_output_unlock(tp);
NET_EPOCH_EXIT(et);
return (error);
}
/*
* Abort the TCP. Drop the connection abruptly.
*/
static void
tcp_usr_abort(struct socket *so)
{
struct inpcb *inp;
struct tcpcb *tp = NULL;
struct epoch_tracker et;
TCPDEBUG0;
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL"));
NET_EPOCH_ENTER(et);
INP_WLOCK(inp);
KASSERT(inp->inp_socket != NULL,
("tcp_usr_abort: inp_socket == NULL"));
/*
* If we still have full TCP state, and we're not dropped, drop.
*/
if (!(inp->inp_flags & INP_TIMEWAIT) &&
!(inp->inp_flags & INP_DROPPED)) {
tp = intotcpcb(inp);
TCPDEBUG1();
tp = tcp_drop(tp, ECONNABORTED);
if (tp == NULL)
goto dropped;
TCPDEBUG2(PRU_ABORT);
TCP_PROBE2(debug__user, tp, PRU_ABORT);
}
if (!(inp->inp_flags & INP_DROPPED)) {
soref(so);
inp->inp_flags |= INP_SOCKREF;
}
INP_WUNLOCK(inp);
dropped:
NET_EPOCH_EXIT(et);
}
/*
* TCP socket is closed. Start friendly disconnect.
*/
static void
tcp_usr_close(struct socket *so)
{
struct inpcb *inp;
struct tcpcb *tp = NULL;
struct epoch_tracker et;
TCPDEBUG0;
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL"));
NET_EPOCH_ENTER(et);
INP_WLOCK(inp);
KASSERT(inp->inp_socket != NULL,
("tcp_usr_close: inp_socket == NULL"));
/*
* If we still have full TCP state, and we're not dropped, initiate
* a disconnect.
*/
if (!(inp->inp_flags & INP_TIMEWAIT) &&
!(inp->inp_flags & INP_DROPPED)) {
tp = intotcpcb(inp);
tp->t_flags |= TF_CLOSED;
TCPDEBUG1();
tcp_disconnect(tp);
TCPDEBUG2(PRU_CLOSE);
TCP_PROBE2(debug__user, tp, PRU_CLOSE);
}
if (!(inp->inp_flags & INP_DROPPED)) {
soref(so);
inp->inp_flags |= INP_SOCKREF;
}
INP_WUNLOCK(inp);
NET_EPOCH_EXIT(et);
}
static int
tcp_pru_options_support(struct tcpcb *tp, int flags)
{
/*
* If the specific TCP stack has a pru_options
* specified then it does not always support
* all the PRU_XX options and we must ask it.
* If the function is not specified then all
* of the PRU_XX options are supported.
*/
int ret = 0;
if (tp->t_fb->tfb_pru_options) {
ret = (*tp->t_fb->tfb_pru_options)(tp, flags);
}
return (ret);
}
/*
* Receive out-of-band data.
*/
static int
tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags)
{
int error = 0;
struct inpcb *inp;
struct tcpcb *tp = NULL;
TCPDEBUG0;
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL"));
INP_WLOCK(inp);
if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
error = ECONNRESET;
goto out;
}
tp = intotcpcb(inp);
error = tcp_pru_options_support(tp, PRUS_OOB);
if (error) {
goto out;
}
TCPDEBUG1();
if ((so->so_oobmark == 0 &&
(so->so_rcv.sb_state & SBS_RCVATMARK) == 0) ||
so->so_options & SO_OOBINLINE ||
tp->t_oobflags & TCPOOB_HADDATA) {
error = EINVAL;
goto out;
}
if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
error = EWOULDBLOCK;
goto out;
}
m->m_len = 1;
*mtod(m, caddr_t) = tp->t_iobc;
if ((flags & MSG_PEEK) == 0)
tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
out:
TCPDEBUG2(PRU_RCVOOB);
TCP_PROBE2(debug__user, tp, PRU_RCVOOB);
INP_WUNLOCK(inp);
return (error);
}
#ifdef INET
struct protosw tcp_protosw = {
.pr_type = SOCK_STREAM,
.pr_protocol = IPPROTO_TCP,
.pr_flags = PR_CONNREQUIRED | PR_IMPLOPCL | PR_WANTRCVD |
PR_CAPATTACH,
.pr_ctloutput = tcp_ctloutput,
.pr_abort = tcp_usr_abort,
.pr_accept = tcp_usr_accept,
.pr_attach = tcp_usr_attach,
.pr_bind = tcp_usr_bind,
.pr_connect = tcp_usr_connect,
.pr_control = in_control,
.pr_detach = tcp_usr_detach,
.pr_disconnect = tcp_usr_disconnect,
.pr_listen = tcp_usr_listen,
.pr_peeraddr = in_getpeeraddr,
.pr_rcvd = tcp_usr_rcvd,
.pr_rcvoob = tcp_usr_rcvoob,
.pr_send = tcp_usr_send,
.pr_ready = tcp_usr_ready,
.pr_shutdown = tcp_usr_shutdown,
.pr_sockaddr = in_getsockaddr,
.pr_sosetlabel = in_pcbsosetlabel,
.pr_close = tcp_usr_close,
};
#endif /* INET */
#ifdef INET6
struct protosw tcp6_protosw = {
.pr_type = SOCK_STREAM,
.pr_protocol = IPPROTO_TCP,
.pr_flags = PR_CONNREQUIRED | PR_IMPLOPCL |PR_WANTRCVD |
PR_CAPATTACH,
.pr_ctloutput = tcp_ctloutput,
.pr_abort = tcp_usr_abort,
.pr_accept = tcp6_usr_accept,
.pr_attach = tcp_usr_attach,
.pr_bind = tcp6_usr_bind,
.pr_connect = tcp6_usr_connect,
.pr_control = in6_control,
.pr_detach = tcp_usr_detach,
.pr_disconnect = tcp_usr_disconnect,
.pr_listen = tcp6_usr_listen,
.pr_peeraddr = in6_mapped_peeraddr,
.pr_rcvd = tcp_usr_rcvd,
.pr_rcvoob = tcp_usr_rcvoob,
.pr_send = tcp_usr_send,
.pr_ready = tcp_usr_ready,
.pr_shutdown = tcp_usr_shutdown,
.pr_sockaddr = in6_mapped_sockaddr,
.pr_sosetlabel = in_pcbsosetlabel,
.pr_close = tcp_usr_close,
};
#endif /* INET6 */
#ifdef INET
/*
* Common subroutine to open a TCP connection to remote host specified
* by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local
* port number if needed. Call in_pcbconnect_setup to do the routing and
* to choose a local host address (interface). If there is an existing
* incarnation of the same connection in TIME-WAIT state and if the remote
* host was sending CC options and if the connection duration was < MSL, then
* truncate the previous TIME-WAIT state and proceed.
* Initialize connection parameters and enter SYN-SENT state.
*/
static int
tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
{
struct inpcb *inp = tp->t_inpcb, *oinp;
struct socket *so = inp->inp_socket;
struct in_addr laddr;
u_short lport;
int error;
NET_EPOCH_ASSERT();
INP_WLOCK_ASSERT(inp);
INP_HASH_WLOCK(&V_tcbinfo);
if (V_tcp_require_unique_port && inp->inp_lport == 0) {
error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
if (error)
goto out;
}
/*
* Cannot simply call in_pcbconnect, because there might be an
* earlier incarnation of this same connection still in
* TIME_WAIT state, creating an ADDRINUSE error.
*/
laddr = inp->inp_laddr;
lport = inp->inp_lport;
error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport,
&inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred);
if (error && oinp == NULL)
goto out;
if (oinp) {
error = EADDRINUSE;
goto out;
}
/* Handle initial bind if it hadn't been done in advance. */
if (inp->inp_lport == 0) {
inp->inp_lport = lport;
if (in_pcbinshash(inp) != 0) {
inp->inp_lport = 0;
error = EAGAIN;
goto out;
}
}
inp->inp_laddr = laddr;
in_pcbrehash(inp);
INP_HASH_WUNLOCK(&V_tcbinfo);
/*
* Compute window scaling to request:
* Scale to fit into sweet spot. See tcp_syncache.c.
* XXX: This should move to tcp_output().
*/
while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
(TCP_MAXWIN << tp->request_r_scale) < sb_max)
tp->request_r_scale++;
soisconnecting(so);
TCPSTAT_INC(tcps_connattempt);
tcp_state_change(tp, TCPS_SYN_SENT);
tp->iss = tcp_new_isn(&inp->inp_inc);
if (tp->t_flags & TF_REQ_TSTMP)
tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc);
tcp_sendseqinit(tp);
return 0;
out:
INP_HASH_WUNLOCK(&V_tcbinfo);
return (error);
}
#endif /* INET */
#ifdef INET6
static int
tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
{
struct inpcb *inp = tp->t_inpcb;
int error;
INP_WLOCK_ASSERT(inp);
INP_HASH_WLOCK(&V_tcbinfo);
if (V_tcp_require_unique_port && inp->inp_lport == 0) {
error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
if (error)
goto out;
}
error = in6_pcbconnect(inp, nam, td->td_ucred);
if (error != 0)
goto out;
INP_HASH_WUNLOCK(&V_tcbinfo);
/* Compute window scaling to request. */
while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
(TCP_MAXWIN << tp->request_r_scale) < sb_max)
tp->request_r_scale++;
soisconnecting(inp->inp_socket);
TCPSTAT_INC(tcps_connattempt);
tcp_state_change(tp, TCPS_SYN_SENT);
tp->iss = tcp_new_isn(&inp->inp_inc);
if (tp->t_flags & TF_REQ_TSTMP)
tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc);
tcp_sendseqinit(tp);
return 0;
out:
INP_HASH_WUNLOCK(&V_tcbinfo);
return error;
}
#endif /* INET6 */
/*
* Export TCP internal state information via a struct tcp_info, based on the
* Linux 2.6 API. Not ABI compatible as our constants are mapped differently
* (TCP state machine, etc). We export all information using FreeBSD-native
* constants -- for example, the numeric values for tcpi_state will differ
* from Linux.
*/
static void
tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti)
{
INP_WLOCK_ASSERT(tp->t_inpcb);
bzero(ti, sizeof(*ti));
ti->tcpi_state = tp->t_state;
if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP))
ti->tcpi_options |= TCPI_OPT_TIMESTAMPS;
if (tp->t_flags & TF_SACK_PERMIT)
ti->tcpi_options |= TCPI_OPT_SACK;
if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) {
ti->tcpi_options |= TCPI_OPT_WSCALE;
ti->tcpi_snd_wscale = tp->snd_scale;
ti->tcpi_rcv_wscale = tp->rcv_scale;
}
if (tp->t_flags2 & (TF2_ECN_PERMIT | TF2_ACE_PERMIT))
ti->tcpi_options |= TCPI_OPT_ECN;
ti->tcpi_rto = tp->t_rxtcur * tick;
ti->tcpi_last_data_recv = ((uint32_t)ticks - tp->t_rcvtime) * tick;
ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT;
ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT;
ti->tcpi_snd_ssthresh = tp->snd_ssthresh;
ti->tcpi_snd_cwnd = tp->snd_cwnd;
/*
* FreeBSD-specific extension fields for tcp_info.
*/
ti->tcpi_rcv_space = tp->rcv_wnd;
ti->tcpi_rcv_nxt = tp->rcv_nxt;
ti->tcpi_snd_wnd = tp->snd_wnd;
ti->tcpi_snd_bwnd = 0; /* Unused, kept for compat. */
ti->tcpi_snd_nxt = tp->snd_nxt;
ti->tcpi_snd_mss = tp->t_maxseg;
ti->tcpi_rcv_mss = tp->t_maxseg;
ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack;
ti->tcpi_rcv_ooopack = tp->t_rcvoopack;
ti->tcpi_snd_zerowin = tp->t_sndzerowin;
#ifdef TCP_OFFLOAD
if (tp->t_flags & TF_TOE) {
ti->tcpi_options |= TCPI_OPT_TOE;
tcp_offload_tcp_info(tp, ti);
}
#endif
}
/*
* tcp_ctloutput() must drop the inpcb lock before performing copyin on
* socket option arguments. When it re-acquires the lock after the copy, it
* has to revalidate that the connection is still valid for the socket
* option.
*/
#define INP_WLOCK_RECHECK_CLEANUP(inp, cleanup) do { \
INP_WLOCK(inp); \
if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { \
INP_WUNLOCK(inp); \
cleanup; \
return (ECONNRESET); \
} \
tp = intotcpcb(inp); \
} while(0)
#define INP_WLOCK_RECHECK(inp) INP_WLOCK_RECHECK_CLEANUP((inp), /* noop */)
int
tcp_ctloutput_set(struct inpcb *inp, struct sockopt *sopt)
{
struct socket *so = inp->inp_socket;
struct tcpcb *tp = intotcpcb(inp);
int error = 0;
MPASS(sopt->sopt_dir == SOPT_SET);
INP_WLOCK_ASSERT(inp);
KASSERT((inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) == 0,
("inp_flags == %x", inp->inp_flags));
KASSERT(so != NULL, ("inp_socket == NULL"));
if (sopt->sopt_level != IPPROTO_TCP) {
INP_WUNLOCK(inp);
#ifdef INET6
if (inp->inp_vflag & INP_IPV6PROTO)
error = ip6_ctloutput(so, sopt);
#endif
#if defined(INET6) && defined(INET)
else
#endif
#ifdef INET
error = ip_ctloutput(so, sopt);
#endif
/*
* When an IP-level socket option affects TCP, pass control
* down to stack tfb_tcp_ctloutput, otherwise return what
* IP level returned.
*/
switch (sopt->sopt_level) {
#ifdef INET6
case IPPROTO_IPV6:
if ((inp->inp_vflag & INP_IPV6PROTO) == 0)
return (error);
switch (sopt->sopt_name) {
case IPV6_TCLASS:
/* Notify tcp stacks that care (e.g. RACK). */
break;
case IPV6_USE_MIN_MTU:
/* Update t_maxseg accordingly. */
break;
default:
return (error);
}
break;
#endif
#ifdef INET
case IPPROTO_IP:
switch (sopt->sopt_name) {
case IP_TOS:
inp->inp_ip_tos &= ~IPTOS_ECN_MASK;
break;
case IP_TTL:
/* Notify tcp stacks that care (e.g. RACK). */
break;
default:
return (error);
}
break;
#endif
default:
return (error);
}
INP_WLOCK(inp);
if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
INP_WUNLOCK(inp);
return (ECONNRESET);
}
} else if (sopt->sopt_name == TCP_FUNCTION_BLK) {
/*
* Protect the TCP option TCP_FUNCTION_BLK so
* that a sub-function can *never* overwrite this.
*/
struct tcp_function_set fsn;
struct tcp_function_block *blk;
INP_WUNLOCK(inp);
error = sooptcopyin(sopt, &fsn, sizeof fsn, sizeof fsn);
if (error)
return (error);
INP_WLOCK(inp);
if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
INP_WUNLOCK(inp);
return (ECONNRESET);
}
tp = intotcpcb(inp);
blk = find_and_ref_tcp_functions(&fsn);
if (blk == NULL) {
INP_WUNLOCK(inp);
return (ENOENT);
}
if (tp->t_fb == blk) {
/* You already have this */
refcount_release(&blk->tfb_refcnt);
INP_WUNLOCK(inp);
return (0);
}
if (tp->t_state != TCPS_CLOSED) {
/*
* The user has advanced the state
* past the initial point, we may not
* be able to switch.
*/
if (blk->tfb_tcp_handoff_ok != NULL) {
/*
* Does the stack provide a
* query mechanism, if so it may
* still be possible?
*/
error = (*blk->tfb_tcp_handoff_ok)(tp);
} else
error = EINVAL;
if (error) {
refcount_release(&blk->tfb_refcnt);
INP_WUNLOCK(inp);
return(error);
}
}
if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) {
refcount_release(&blk->tfb_refcnt);
INP_WUNLOCK(inp);
return (ENOENT);
}
/*
* Release the old refcnt, the
* lookup acquired a ref on the
* new one already.
*/
if (tp->t_fb->tfb_tcp_fb_fini) {
struct epoch_tracker et;
/*
* Tell the stack to cleanup with 0 i.e.
* the tcb is not going away.
*/
NET_EPOCH_ENTER(et);
(*tp->t_fb->tfb_tcp_fb_fini)(tp, 0);
NET_EPOCH_EXIT(et);
}
#ifdef TCPHPTS
/* Assure that we are not on any hpts */
tcp_hpts_remove(tp->t_inpcb);
#endif
if (blk->tfb_tcp_fb_init) {
error = (*blk->tfb_tcp_fb_init)(tp);
if (error) {
refcount_release(&blk->tfb_refcnt);
if (tp->t_fb->tfb_tcp_fb_init) {
if((*tp->t_fb->tfb_tcp_fb_init)(tp) != 0) {
/* Fall back failed, drop the connection */
INP_WUNLOCK(inp);
soabort(so);
return (error);
}
}
goto err_out;
}
}
refcount_release(&tp->t_fb->tfb_refcnt);
tp->t_fb = blk;
#ifdef TCP_OFFLOAD
if (tp->t_flags & TF_TOE) {
tcp_offload_ctloutput(tp, sopt->sopt_dir,
sopt->sopt_name);
}
#endif
err_out:
INP_WUNLOCK(inp);
return (error);
}
/* Pass in the INP locked, callee must unlock it. */
return (tp->t_fb->tfb_tcp_ctloutput(inp, sopt));
}
static int
tcp_ctloutput_get(struct inpcb *inp, struct sockopt *sopt)
{
struct socket *so = inp->inp_socket;
struct tcpcb *tp = intotcpcb(inp);
int error = 0;
MPASS(sopt->sopt_dir == SOPT_GET);
INP_WLOCK_ASSERT(inp);
KASSERT((inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) == 0,
("inp_flags == %x", inp->inp_flags));
KASSERT(so != NULL, ("inp_socket == NULL"));
if (sopt->sopt_level != IPPROTO_TCP) {
INP_WUNLOCK(inp);
#ifdef INET6
if (inp->inp_vflag & INP_IPV6PROTO)
error = ip6_ctloutput(so, sopt);
#endif /* INET6 */
#if defined(INET6) && defined(INET)
else
#endif
#ifdef INET
error = ip_ctloutput(so, sopt);
#endif
return (error);
}
if (((sopt->sopt_name == TCP_FUNCTION_BLK) ||
(sopt->sopt_name == TCP_FUNCTION_ALIAS))) {
struct tcp_function_set fsn;
if (sopt->sopt_name == TCP_FUNCTION_ALIAS) {
memset(&fsn, 0, sizeof(fsn));
find_tcp_function_alias(tp->t_fb, &fsn);
} else {
strncpy(fsn.function_set_name,
tp->t_fb->tfb_tcp_block_name,
TCP_FUNCTION_NAME_LEN_MAX);
fsn.function_set_name[TCP_FUNCTION_NAME_LEN_MAX - 1] = '\0';
}
fsn.pcbcnt = tp->t_fb->tfb_refcnt;
INP_WUNLOCK(inp);
error = sooptcopyout(sopt, &fsn, sizeof fsn);
return (error);
}
/* Pass in the INP locked, callee must unlock it. */
return (tp->t_fb->tfb_tcp_ctloutput(inp, sopt));
}
int
tcp_ctloutput(struct socket *so, struct sockopt *sopt)
{
struct inpcb *inp;
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL"));
INP_WLOCK(inp);
if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
INP_WUNLOCK(inp);
return (ECONNRESET);
}
if (sopt->sopt_dir == SOPT_SET)
return (tcp_ctloutput_set(inp, sopt));
else if (sopt->sopt_dir == SOPT_GET)
return (tcp_ctloutput_get(inp, sopt));
else
panic("%s: sopt_dir $%d", __func__, sopt->sopt_dir);
}
/*
* If this assert becomes untrue, we need to change the size of the buf
* variable in tcp_default_ctloutput().
*/
#ifdef CTASSERT
CTASSERT(TCP_CA_NAME_MAX <= TCP_LOG_ID_LEN);
CTASSERT(TCP_LOG_REASON_LEN <= TCP_LOG_ID_LEN);
#endif
#ifdef KERN_TLS
static int
copyin_tls_enable(struct sockopt *sopt, struct tls_enable *tls)
{
struct tls_enable_v0 tls_v0;
int error;
if (sopt->sopt_valsize == sizeof(tls_v0)) {
error = sooptcopyin(sopt, &tls_v0, sizeof(tls_v0),
sizeof(tls_v0));
if (error)
return (error);
memset(tls, 0, sizeof(*tls));
tls->cipher_key = tls_v0.cipher_key;
tls->iv = tls_v0.iv;
tls->auth_key = tls_v0.auth_key;
tls->cipher_algorithm = tls_v0.cipher_algorithm;
tls->cipher_key_len = tls_v0.cipher_key_len;
tls->iv_len = tls_v0.iv_len;
tls->auth_algorithm = tls_v0.auth_algorithm;
tls->auth_key_len = tls_v0.auth_key_len;
tls->flags = tls_v0.flags;
tls->tls_vmajor = tls_v0.tls_vmajor;
tls->tls_vminor = tls_v0.tls_vminor;
return (0);
}
return (sooptcopyin(sopt, tls, sizeof(*tls), sizeof(*tls)));
}
#endif
extern struct cc_algo newreno_cc_algo;
static int
tcp_set_cc_mod(struct inpcb *inp, struct sockopt *sopt)
{
struct cc_algo *algo;
void *ptr = NULL;
struct tcpcb *tp;
struct cc_var cc_mem;
char buf[TCP_CA_NAME_MAX];
size_t mem_sz;
int error;
INP_WUNLOCK(inp);
error = sooptcopyin(sopt, buf, TCP_CA_NAME_MAX - 1, 1);
if (error)
return(error);
buf[sopt->sopt_valsize] = '\0';
CC_LIST_RLOCK();
STAILQ_FOREACH(algo, &cc_list, entries) {
if (strncmp(buf, algo->name,
TCP_CA_NAME_MAX) == 0) {
if (algo->flags & CC_MODULE_BEING_REMOVED) {
/* We can't "see" modules being unloaded */
continue;
}
break;
}
}
if (algo == NULL) {
CC_LIST_RUNLOCK();
return(ESRCH);
}
/*
* With a reference the algorithm cannot be removed
* so we hold a reference through the change process.
*/
cc_refer(algo);
CC_LIST_RUNLOCK();
if (algo->cb_init != NULL) {
/* We can now pre-get the memory for the CC */
mem_sz = (*algo->cc_data_sz)();
if (mem_sz == 0) {
goto no_mem_needed;
}
ptr = malloc(mem_sz, M_CC_MEM, M_WAITOK);
} else {
no_mem_needed:
mem_sz = 0;
ptr = NULL;
}
/*
* Make sure its all clean and zero and also get
* back the inplock.
*/
memset(&cc_mem, 0, sizeof(cc_mem));
INP_WLOCK(inp);
if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
INP_WUNLOCK(inp);
if (ptr)
free(ptr, M_CC_MEM);
/* Release our temp reference */
CC_LIST_RLOCK();
cc_release(algo);
CC_LIST_RUNLOCK();
return (ECONNRESET);
}
tp = intotcpcb(inp);
if (ptr != NULL)
memset(ptr, 0, mem_sz);
cc_mem.ccvc.tcp = tp;
/*
* We once again hold a write lock over the tcb so it's
* safe to do these things without ordering concerns.
* Note here we init into stack memory.
*/
if (algo->cb_init != NULL)
error = algo->cb_init(&cc_mem, ptr);
else
error = 0;
/*
* The CC algorithms, when given their memory
* should not fail we could in theory have a
* KASSERT here.
*/
if (error == 0) {
/*
* Touchdown, lets go ahead and move the
* connection to the new CC module by
* copying in the cc_mem after we call
* the old ones cleanup (if any).
*/
if (CC_ALGO(tp)->cb_destroy != NULL)
CC_ALGO(tp)->cb_destroy(tp->ccv);
/* Detach the old CC from the tcpcb */
cc_detach(tp);
/* Copy in our temp memory that was inited */
memcpy(tp->ccv, &cc_mem, sizeof(struct cc_var));
/* Now attach the new, which takes a reference */
cc_attach(tp, algo);
/* Ok now are we where we have gotten past any conn_init? */
if (TCPS_HAVEESTABLISHED(tp->t_state) && (CC_ALGO(tp)->conn_init != NULL)) {
/* Yep run the connection init for the new CC */
CC_ALGO(tp)->conn_init(tp->ccv);
}
} else if (ptr)
free(ptr, M_CC_MEM);
INP_WUNLOCK(inp);
/* Now lets release our temp reference */
CC_LIST_RLOCK();
cc_release(algo);
CC_LIST_RUNLOCK();
return (error);
}
int
tcp_default_ctloutput(struct inpcb *inp, struct sockopt *sopt)
{
struct tcpcb *tp = intotcpcb(inp);
int error, opt, optval;
u_int ui;
struct tcp_info ti;
#ifdef KERN_TLS
struct tls_enable tls;
struct socket *so = inp->inp_socket;
#endif
char *pbuf, buf[TCP_LOG_ID_LEN];
#ifdef STATS
struct statsblob *sbp;
#endif
size_t len;
INP_WLOCK_ASSERT(inp);
KASSERT((inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) == 0,
("inp_flags == %x", inp->inp_flags));
KASSERT(inp->inp_socket != NULL, ("inp_socket == NULL"));
switch (sopt->sopt_level) {
#ifdef INET6
case IPPROTO_IPV6:
MPASS(inp->inp_vflag & INP_IPV6PROTO);
switch (sopt->sopt_name) {
case IPV6_USE_MIN_MTU:
tcp6_use_min_mtu(tp);
/* FALLTHROUGH */
}
INP_WUNLOCK(inp);
return (0);
#endif
#ifdef INET
case IPPROTO_IP:
INP_WUNLOCK(inp);
return (0);
#endif
}
/*
* For TCP_CCALGOOPT forward the control to CC module, for both
* SOPT_SET and SOPT_GET.
*/
switch (sopt->sopt_name) {
case TCP_CCALGOOPT:
INP_WUNLOCK(inp);
if (sopt->sopt_valsize > CC_ALGOOPT_LIMIT)
return (EINVAL);
pbuf = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK | M_ZERO);
error = sooptcopyin(sopt, pbuf, sopt->sopt_valsize,
sopt->sopt_valsize);
if (error) {
free(pbuf, M_TEMP);
return (error);
}
INP_WLOCK_RECHECK_CLEANUP(inp, free(pbuf, M_TEMP));
if (CC_ALGO(tp)->ctl_output != NULL)
error = CC_ALGO(tp)->ctl_output(tp->ccv, sopt, pbuf);
else
error = ENOENT;
INP_WUNLOCK(inp);
if (error == 0 && sopt->sopt_dir == SOPT_GET)
error = sooptcopyout(sopt, pbuf, sopt->sopt_valsize);
free(pbuf, M_TEMP);
return (error);
}
switch (sopt->sopt_dir) {
case SOPT_SET:
switch (sopt->sopt_name) {
#if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
case TCP_MD5SIG:
INP_WUNLOCK(inp);
if (!TCPMD5_ENABLED())
return (ENOPROTOOPT);
error = TCPMD5_PCBCTL(inp, sopt);
if (error)
return (error);
INP_WLOCK_RECHECK(inp);
goto unlock_and_done;
#endif /* IPSEC */
case TCP_NODELAY:
case TCP_NOOPT:
case TCP_LRD:
INP_WUNLOCK(inp);
error = sooptcopyin(sopt, &optval, sizeof optval,
sizeof optval);
if (error)
return (error);
INP_WLOCK_RECHECK(inp);
switch (sopt->sopt_name) {
case TCP_NODELAY:
opt = TF_NODELAY;
break;
case TCP_NOOPT:
opt = TF_NOOPT;
break;
case TCP_LRD:
opt = TF_LRD;
break;
default:
opt = 0; /* dead code to fool gcc */
break;
}
if (optval)
tp->t_flags |= opt;
else
tp->t_flags &= ~opt;
unlock_and_done:
#ifdef TCP_OFFLOAD
if (tp->t_flags & TF_TOE) {
tcp_offload_ctloutput(tp, sopt->sopt_dir,
sopt->sopt_name);
}
#endif
INP_WUNLOCK(inp);
break;
case TCP_NOPUSH:
INP_WUNLOCK(inp);
error = sooptcopyin(sopt, &optval, sizeof optval,
sizeof optval);
if (error)
return (error);
INP_WLOCK_RECHECK(inp);
if (optval)
tp->t_flags |= TF_NOPUSH;
else if (tp->t_flags & TF_NOPUSH) {
tp->t_flags &= ~TF_NOPUSH;
if (TCPS_HAVEESTABLISHED(tp->t_state)) {
struct epoch_tracker et;
NET_EPOCH_ENTER(et);
error = tcp_output_nodrop(tp);
NET_EPOCH_EXIT(et);
}
}
goto unlock_and_done;
case TCP_REMOTE_UDP_ENCAPS_PORT:
INP_WUNLOCK(inp);
error = sooptcopyin(sopt, &optval, sizeof optval,
sizeof optval);
if (error)
return (error);
if ((optval < TCP_TUNNELING_PORT_MIN) ||
(optval > TCP_TUNNELING_PORT_MAX)) {
/* Its got to be in range */
return (EINVAL);
}
if ((V_tcp_udp_tunneling_port == 0) && (optval != 0)) {
/* You have to have enabled a UDP tunneling port first */
return (EINVAL);
}
INP_WLOCK_RECHECK(inp);
if (tp->t_state != TCPS_CLOSED) {
/* You can't change after you are connected */
error = EINVAL;
} else {
/* Ok we are all good set the port */
tp->t_port = htons(optval);
}
goto unlock_and_done;
case TCP_MAXSEG:
INP_WUNLOCK(inp);
error = sooptcopyin(sopt, &optval, sizeof optval,
sizeof optval);
if (error)
return (error);
INP_WLOCK_RECHECK(inp);
if (optval > 0 && optval <= tp->t_maxseg &&
optval + 40 >= V_tcp_minmss)
tp->t_maxseg = optval;
else
error = EINVAL;
goto unlock_and_done;
case TCP_INFO:
INP_WUNLOCK(inp);
error = EINVAL;
break;
case TCP_STATS:
INP_WUNLOCK(inp);
#ifdef STATS
error = sooptcopyin(sopt, &optval, sizeof optval,
sizeof optval);
if (error)
return (error);
if (optval > 0)
sbp = stats_blob_alloc(
V_tcp_perconn_stats_dflt_tpl, 0);
else
sbp = NULL;
INP_WLOCK_RECHECK(inp);
if ((tp->t_stats != NULL && sbp == NULL) ||
(tp->t_stats == NULL && sbp != NULL)) {
struct statsblob *t = tp->t_stats;
tp->t_stats = sbp;
sbp = t;
}
INP_WUNLOCK(inp);
stats_blob_destroy(sbp);
#else
return (EOPNOTSUPP);
#endif /* !STATS */
break;
case TCP_CONGESTION:
error = tcp_set_cc_mod(inp, sopt);
break;
case TCP_REUSPORT_LB_NUMA:
INP_WUNLOCK(inp);
error = sooptcopyin(sopt, &optval, sizeof(optval),
sizeof(optval));
INP_WLOCK_RECHECK(inp);
if (!error)
error = in_pcblbgroup_numa(inp, optval);
INP_WUNLOCK(inp);
break;
#ifdef KERN_TLS
case TCP_TXTLS_ENABLE:
INP_WUNLOCK(inp);
error = copyin_tls_enable(sopt, &tls);
if (error)
break;
error = ktls_enable_tx(so, &tls);
break;
case TCP_TXTLS_MODE:
INP_WUNLOCK(inp);
error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
if (error)
return (error);
INP_WLOCK_RECHECK(inp);
error = ktls_set_tx_mode(so, ui);
INP_WUNLOCK(inp);
break;
case TCP_RXTLS_ENABLE:
INP_WUNLOCK(inp);
error = sooptcopyin(sopt, &tls, sizeof(tls),
sizeof(tls));
if (error)
break;
error = ktls_enable_rx(so, &tls);
break;
#endif
case TCP_MAXUNACKTIME:
case TCP_KEEPIDLE:
case TCP_KEEPINTVL:
case TCP_KEEPINIT:
INP_WUNLOCK(inp);
error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
if (error)
return (error);
if (ui > (UINT_MAX / hz)) {
error = EINVAL;
break;
}
ui *= hz;
INP_WLOCK_RECHECK(inp);
switch (sopt->sopt_name) {
case TCP_MAXUNACKTIME:
tp->t_maxunacktime = ui;
break;
case TCP_KEEPIDLE:
tp->t_keepidle = ui;
/*
* XXX: better check current remaining
* timeout and "merge" it with new value.
*/
if ((tp->t_state > TCPS_LISTEN) &&
(tp->t_state <= TCPS_CLOSING))
tcp_timer_activate(tp, TT_KEEP,
TP_KEEPIDLE(tp));
break;
case TCP_KEEPINTVL:
tp->t_keepintvl = ui;
if ((tp->t_state == TCPS_FIN_WAIT_2) &&
(TP_MAXIDLE(tp) > 0))
tcp_timer_activate(tp, TT_2MSL,
TP_MAXIDLE(tp));
break;
case TCP_KEEPINIT:
tp->t_keepinit = ui;
if (tp->t_state == TCPS_SYN_RECEIVED ||
tp->t_state == TCPS_SYN_SENT)
tcp_timer_activate(tp, TT_KEEP,
TP_KEEPINIT(tp));
break;
}
goto unlock_and_done;
case TCP_KEEPCNT:
INP_WUNLOCK(inp);
error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
if (error)
return (error);
INP_WLOCK_RECHECK(inp);
tp->t_keepcnt = ui;
if ((tp->t_state == TCPS_FIN_WAIT_2) &&
(TP_MAXIDLE(tp) > 0))
tcp_timer_activate(tp, TT_2MSL,
TP_MAXIDLE(tp));
goto unlock_and_done;
#ifdef TCPPCAP
case TCP_PCAP_OUT:
case TCP_PCAP_IN:
INP_WUNLOCK(inp);
error = sooptcopyin(sopt, &optval, sizeof optval,
sizeof optval);
if (error)
return (error);
INP_WLOCK_RECHECK(inp);
if (optval >= 0)
tcp_pcap_set_sock_max(TCP_PCAP_OUT ?
&(tp->t_outpkts) : &(tp->t_inpkts),
optval);
else
error = EINVAL;
goto unlock_and_done;
#endif
case TCP_FASTOPEN: {
struct tcp_fastopen tfo_optval;
INP_WUNLOCK(inp);
if (!V_tcp_fastopen_client_enable &&
!V_tcp_fastopen_server_enable)
return (EPERM);
error = sooptcopyin(sopt, &tfo_optval,
sizeof(tfo_optval), sizeof(int));
if (error)
return (error);
INP_WLOCK_RECHECK(inp);
if ((tp->t_state != TCPS_CLOSED) &&
(tp->t_state != TCPS_LISTEN)) {
error = EINVAL;
goto unlock_and_done;
}
if (tfo_optval.enable) {
if (tp->t_state == TCPS_LISTEN) {
if (!V_tcp_fastopen_server_enable) {
error = EPERM;
goto unlock_and_done;
}
if (tp->t_tfo_pending == NULL)
tp->t_tfo_pending =
tcp_fastopen_alloc_counter();
} else {
/*
* If a pre-shared key was provided,
* stash it in the client cookie
* field of the tcpcb for use during
* connect.
*/
if (sopt->sopt_valsize ==
sizeof(tfo_optval)) {
memcpy(tp->t_tfo_cookie.client,
tfo_optval.psk,
TCP_FASTOPEN_PSK_LEN);
tp->t_tfo_client_cookie_len =
TCP_FASTOPEN_PSK_LEN;
}
}
tp->t_flags |= TF_FASTOPEN;
} else
tp->t_flags &= ~TF_FASTOPEN;
goto unlock_and_done;
}
#ifdef TCP_BLACKBOX
case TCP_LOG:
INP_WUNLOCK(inp);
error = sooptcopyin(sopt, &optval, sizeof optval,
sizeof optval);
if (error)
return (error);
INP_WLOCK_RECHECK(inp);
error = tcp_log_state_change(tp, optval);
goto unlock_and_done;
case TCP_LOGBUF:
INP_WUNLOCK(inp);
error = EINVAL;
break;
case TCP_LOGID:
INP_WUNLOCK(inp);
error = sooptcopyin(sopt, buf, TCP_LOG_ID_LEN - 1, 0);
if (error)
break;
buf[sopt->sopt_valsize] = '\0';
INP_WLOCK_RECHECK(inp);
error = tcp_log_set_id(tp, buf);
/* tcp_log_set_id() unlocks the INP. */
break;
case TCP_LOGDUMP:
case TCP_LOGDUMPID:
INP_WUNLOCK(inp);
error =
sooptcopyin(sopt, buf, TCP_LOG_REASON_LEN - 1, 0);
if (error)
break;
buf[sopt->sopt_valsize] = '\0';
INP_WLOCK_RECHECK(inp);
if (sopt->sopt_name == TCP_LOGDUMP) {
error = tcp_log_dump_tp_logbuf(tp, buf,
M_WAITOK, true);
INP_WUNLOCK(inp);
} else {
tcp_log_dump_tp_bucket_logbufs(tp, buf);
/*
* tcp_log_dump_tp_bucket_logbufs() drops the
* INP lock.
*/
}
break;
#endif
default:
INP_WUNLOCK(inp);
error = ENOPROTOOPT;
break;
}
break;
case SOPT_GET:
tp = intotcpcb(inp);
switch (sopt->sopt_name) {
#if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
case TCP_MD5SIG:
INP_WUNLOCK(inp);
if (!TCPMD5_ENABLED())
return (ENOPROTOOPT);
error = TCPMD5_PCBCTL(inp, sopt);
break;
#endif
case TCP_NODELAY:
optval = tp->t_flags & TF_NODELAY;
INP_WUNLOCK(inp);
error = sooptcopyout(sopt, &optval, sizeof optval);
break;
case TCP_MAXSEG:
optval = tp->t_maxseg;
INP_WUNLOCK(inp);
error = sooptcopyout(sopt, &optval, sizeof optval);
break;
case TCP_REMOTE_UDP_ENCAPS_PORT:
optval = ntohs(tp->t_port);
INP_WUNLOCK(inp);
error = sooptcopyout(sopt, &optval, sizeof optval);
break;
case TCP_NOOPT:
optval = tp->t_flags & TF_NOOPT;
INP_WUNLOCK(inp);
error = sooptcopyout(sopt, &optval, sizeof optval);
break;
case TCP_NOPUSH:
optval = tp->t_flags & TF_NOPUSH;
INP_WUNLOCK(inp);
error = sooptcopyout(sopt, &optval, sizeof optval);
break;
case TCP_INFO:
tcp_fill_info(tp, &ti);
INP_WUNLOCK(inp);
error = sooptcopyout(sopt, &ti, sizeof ti);
break;
case TCP_STATS:
{
#ifdef STATS
int nheld;
TYPEOF_MEMBER(struct statsblob, flags) sbflags = 0;
error = 0;
socklen_t outsbsz = sopt->sopt_valsize;
if (tp->t_stats == NULL)
error = ENOENT;
else if (outsbsz >= tp->t_stats->cursz)
outsbsz = tp->t_stats->cursz;
else if (outsbsz >= sizeof(struct statsblob))
outsbsz = sizeof(struct statsblob);
else
error = EINVAL;
INP_WUNLOCK(inp);
if (error)
break;
sbp = sopt->sopt_val;
nheld = atop(round_page(((vm_offset_t)sbp) +
(vm_size_t)outsbsz) - trunc_page((vm_offset_t)sbp));
vm_page_t ma[nheld];
if (vm_fault_quick_hold_pages(
&curproc->p_vmspace->vm_map, (vm_offset_t)sbp,
outsbsz, VM_PROT_READ | VM_PROT_WRITE, ma,
nheld) < 0) {
error = EFAULT;
break;
}
if ((error = copyin_nofault(&(sbp->flags), &sbflags,
SIZEOF_MEMBER(struct statsblob, flags))))
goto unhold;
INP_WLOCK_RECHECK(inp);
error = stats_blob_snapshot(&sbp, outsbsz, tp->t_stats,
sbflags | SB_CLONE_USRDSTNOFAULT);
INP_WUNLOCK(inp);
sopt->sopt_valsize = outsbsz;
unhold:
vm_page_unhold_pages(ma, nheld);
#else
INP_WUNLOCK(inp);
error = EOPNOTSUPP;
#endif /* !STATS */
break;
}
case TCP_CONGESTION:
len = strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX);
INP_WUNLOCK(inp);
error = sooptcopyout(sopt, buf, len + 1);
break;
case TCP_MAXUNACKTIME:
case TCP_KEEPIDLE:
case TCP_KEEPINTVL:
case TCP_KEEPINIT:
case TCP_KEEPCNT:
switch (sopt->sopt_name) {
case TCP_MAXUNACKTIME:
ui = TP_MAXUNACKTIME(tp) / hz;
break;
case TCP_KEEPIDLE:
ui = TP_KEEPIDLE(tp) / hz;
break;
case TCP_KEEPINTVL:
ui = TP_KEEPINTVL(tp) / hz;
break;
case TCP_KEEPINIT:
ui = TP_KEEPINIT(tp) / hz;
break;
case TCP_KEEPCNT:
ui = TP_KEEPCNT(tp);
break;
}
INP_WUNLOCK(inp);
error = sooptcopyout(sopt, &ui, sizeof(ui));
break;
#ifdef TCPPCAP
case TCP_PCAP_OUT:
case TCP_PCAP_IN:
optval = tcp_pcap_get_sock_max(TCP_PCAP_OUT ?
&(tp->t_outpkts) : &(tp->t_inpkts));
INP_WUNLOCK(inp);
error = sooptcopyout(sopt, &optval, sizeof optval);
break;
#endif
case TCP_FASTOPEN:
optval = tp->t_flags & TF_FASTOPEN;
INP_WUNLOCK(inp);
error = sooptcopyout(sopt, &optval, sizeof optval);
break;
#ifdef TCP_BLACKBOX
case TCP_LOG:
optval = tp->t_logstate;
INP_WUNLOCK(inp);
error = sooptcopyout(sopt, &optval, sizeof(optval));
break;
case TCP_LOGBUF:
/* tcp_log_getlogbuf() does INP_WUNLOCK(inp) */
error = tcp_log_getlogbuf(sopt, tp);
break;
case TCP_LOGID:
len = tcp_log_get_id(tp, buf);
INP_WUNLOCK(inp);
error = sooptcopyout(sopt, buf, len + 1);
break;
case TCP_LOGDUMP:
case TCP_LOGDUMPID:
INP_WUNLOCK(inp);
error = EINVAL;
break;
#endif
#ifdef KERN_TLS
case TCP_TXTLS_MODE:
error = ktls_get_tx_mode(so, &optval);
INP_WUNLOCK(inp);
if (error == 0)
error = sooptcopyout(sopt, &optval,
sizeof(optval));
break;
case TCP_RXTLS_MODE:
error = ktls_get_rx_mode(so, &optval);
INP_WUNLOCK(inp);
if (error == 0)
error = sooptcopyout(sopt, &optval,
sizeof(optval));
break;
#endif
case TCP_LRD:
optval = tp->t_flags & TF_LRD;
INP_WUNLOCK(inp);
error = sooptcopyout(sopt, &optval, sizeof optval);
break;
default:
INP_WUNLOCK(inp);
error = ENOPROTOOPT;
break;
}
break;
}
return (error);
}
#undef INP_WLOCK_RECHECK
#undef INP_WLOCK_RECHECK_CLEANUP
/*
* Initiate (or continue) disconnect.
* If embryonic state, just send reset (once).
* If in ``let data drain'' option and linger null, just drop.
* Otherwise (hard), mark socket disconnecting and drop
* current input data; switch states based on user close, and
* send segment to peer (with FIN).
*/
static void
tcp_disconnect(struct tcpcb *tp)
{
struct inpcb *inp = tp->t_inpcb;
struct socket *so = inp->inp_socket;
NET_EPOCH_ASSERT();
INP_WLOCK_ASSERT(inp);
/*
* Neither tcp_close() nor tcp_drop() should return NULL, as the
* socket is still open.
*/
if (tp->t_state < TCPS_ESTABLISHED &&
!(tp->t_state > TCPS_LISTEN && IS_FASTOPEN(tp->t_flags))) {
tp = tcp_close(tp);
KASSERT(tp != NULL,
("tcp_disconnect: tcp_close() returned NULL"));
} else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
tp = tcp_drop(tp, 0);
KASSERT(tp != NULL,
("tcp_disconnect: tcp_drop() returned NULL"));
} else {
soisdisconnecting(so);
sbflush(&so->so_rcv);
tcp_usrclosed(tp);
if (!(inp->inp_flags & INP_DROPPED))
/* Ignore stack's drop request, we already at it. */
(void)tcp_output_nodrop(tp);
}
}
/*
* User issued close, and wish to trail through shutdown states:
* if never received SYN, just forget it. If got a SYN from peer,
* but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
* If already got a FIN from peer, then almost done; go to LAST_ACK
* state. In all other cases, have already sent FIN to peer (e.g.
* after PRU_SHUTDOWN), and just have to play tedious game waiting
* for peer to send FIN or not respond to keep-alives, etc.
* We can let the user exit from the close as soon as the FIN is acked.
*/
static void
tcp_usrclosed(struct tcpcb *tp)
{
NET_EPOCH_ASSERT();
INP_WLOCK_ASSERT(tp->t_inpcb);
switch (tp->t_state) {
case TCPS_LISTEN:
#ifdef TCP_OFFLOAD
tcp_offload_listen_stop(tp);
#endif
tcp_state_change(tp, TCPS_CLOSED);
/* FALLTHROUGH */
case TCPS_CLOSED:
tp = tcp_close(tp);
/*
* tcp_close() should never return NULL here as the socket is
* still open.
*/
KASSERT(tp != NULL,
("tcp_usrclosed: tcp_close() returned NULL"));
break;
case TCPS_SYN_SENT:
case TCPS_SYN_RECEIVED:
tp->t_flags |= TF_NEEDFIN;
break;
case TCPS_ESTABLISHED:
tcp_state_change(tp, TCPS_FIN_WAIT_1);
break;
case TCPS_CLOSE_WAIT:
tcp_state_change(tp, TCPS_LAST_ACK);
break;
}
if (tp->t_acktime == 0)
tp->t_acktime = ticks;
if (tp->t_state >= TCPS_FIN_WAIT_2) {
soisdisconnected(tp->t_inpcb->inp_socket);
/* Prevent the connection hanging in FIN_WAIT_2 forever. */
if (tp->t_state == TCPS_FIN_WAIT_2) {
int timeout;
timeout = (tcp_fast_finwait2_recycle) ?
tcp_finwait2_timeout : TP_MAXIDLE(tp);
tcp_timer_activate(tp, TT_2MSL, timeout);
}
}
}
#ifdef DDB
static void
db_print_indent(int indent)
{
int i;
for (i = 0; i < indent; i++)
db_printf(" ");
}
static void
db_print_tstate(int t_state)
{
switch (t_state) {
case TCPS_CLOSED:
db_printf("TCPS_CLOSED");
return;
case TCPS_LISTEN:
db_printf("TCPS_LISTEN");
return;
case TCPS_SYN_SENT:
db_printf("TCPS_SYN_SENT");
return;
case TCPS_SYN_RECEIVED:
db_printf("TCPS_SYN_RECEIVED");
return;
case TCPS_ESTABLISHED:
db_printf("TCPS_ESTABLISHED");
return;
case TCPS_CLOSE_WAIT:
db_printf("TCPS_CLOSE_WAIT");
return;
case TCPS_FIN_WAIT_1:
db_printf("TCPS_FIN_WAIT_1");
return;
case TCPS_CLOSING:
db_printf("TCPS_CLOSING");
return;
case TCPS_LAST_ACK:
db_printf("TCPS_LAST_ACK");
return;
case TCPS_FIN_WAIT_2:
db_printf("TCPS_FIN_WAIT_2");
return;
case TCPS_TIME_WAIT:
db_printf("TCPS_TIME_WAIT");
return;
default:
db_printf("unknown");
return;
}
}
static void
db_print_tflags(u_int t_flags)
{
int comma;
comma = 0;
if (t_flags & TF_ACKNOW) {
db_printf("%sTF_ACKNOW", comma ? ", " : "");
comma = 1;
}
if (t_flags & TF_DELACK) {
db_printf("%sTF_DELACK", comma ? ", " : "");
comma = 1;
}
if (t_flags & TF_NODELAY) {
db_printf("%sTF_NODELAY", comma ? ", " : "");
comma = 1;
}
if (t_flags & TF_NOOPT) {
db_printf("%sTF_NOOPT", comma ? ", " : "");
comma = 1;
}
if (t_flags & TF_SENTFIN) {
db_printf("%sTF_SENTFIN", comma ? ", " : "");
comma = 1;
}
if (t_flags & TF_REQ_SCALE) {
db_printf("%sTF_REQ_SCALE", comma ? ", " : "");
comma = 1;
}
if (t_flags & TF_RCVD_SCALE) {
db_printf("%sTF_RECVD_SCALE", comma ? ", " : "");
comma = 1;
}
if (t_flags & TF_REQ_TSTMP) {
db_printf("%sTF_REQ_TSTMP", comma ? ", " : "");
comma = 1;
}
if (t_flags & TF_RCVD_TSTMP) {
db_printf("%sTF_RCVD_TSTMP", comma ? ", " : "");
comma = 1;
}
if (t_flags & TF_SACK_PERMIT) {
db_printf("%sTF_SACK_PERMIT", comma ? ", " : "");
comma = 1;
}
if (t_flags & TF_NEEDSYN) {
db_printf("%sTF_NEEDSYN", comma ? ", " : "");
comma = 1;
}
if (t_flags & TF_NEEDFIN) {
db_printf("%sTF_NEEDFIN", comma ? ", " : "");
comma = 1;
}
if (t_flags & TF_NOPUSH) {
db_printf("%sTF_NOPUSH", comma ? ", " : "");
comma = 1;
}
if (t_flags & TF_PREVVALID) {
db_printf("%sTF_PREVVALID", comma ? ", " : "");
comma = 1;
}
if (t_flags & TF_MORETOCOME) {
db_printf("%sTF_MORETOCOME", comma ? ", " : "");
comma = 1;
}
if (t_flags & TF_SONOTCONN) {
db_printf("%sTF_SONOTCONN", comma ? ", " : "");
comma = 1;
}
if (t_flags & TF_LASTIDLE) {
db_printf("%sTF_LASTIDLE", comma ? ", " : "");
comma = 1;
}
if (t_flags & TF_RXWIN0SENT) {
db_printf("%sTF_RXWIN0SENT", comma ? ", " : "");
comma = 1;
}
if (t_flags & TF_FASTRECOVERY) {
db_printf("%sTF_FASTRECOVERY", comma ? ", " : "");
comma = 1;
}
if (t_flags & TF_CONGRECOVERY) {
db_printf("%sTF_CONGRECOVERY", comma ? ", " : "");
comma = 1;
}
if (t_flags & TF_WASFRECOVERY) {
db_printf("%sTF_WASFRECOVERY", comma ? ", " : "");
comma = 1;
}
if (t_flags & TF_WASCRECOVERY) {
db_printf("%sTF_WASCRECOVERY", comma ? ", " : "");
comma = 1;
}
if (t_flags & TF_SIGNATURE) {
db_printf("%sTF_SIGNATURE", comma ? ", " : "");
comma = 1;
}
if (t_flags & TF_FORCEDATA) {
db_printf("%sTF_FORCEDATA", comma ? ", " : "");
comma = 1;
}
if (t_flags & TF_TSO) {
db_printf("%sTF_TSO", comma ? ", " : "");
comma = 1;
}
if (t_flags & TF_FASTOPEN) {
db_printf("%sTF_FASTOPEN", comma ? ", " : "");
comma = 1;
}
}
static void
db_print_tflags2(u_int t_flags2)
{
int comma;
comma = 0;
if (t_flags2 & TF2_PLPMTU_BLACKHOLE) {
db_printf("%sTF2_PLPMTU_BLACKHOLE", comma ? ", " : "");
comma = 1;
}
if (t_flags2 & TF2_PLPMTU_PMTUD) {
db_printf("%sTF2_PLPMTU_PMTUD", comma ? ", " : "");
comma = 1;
}
if (t_flags2 & TF2_PLPMTU_MAXSEGSNT) {
db_printf("%sTF2_PLPMTU_MAXSEGSNT", comma ? ", " : "");
comma = 1;
}
if (t_flags2 & TF2_LOG_AUTO) {
db_printf("%sTF2_LOG_AUTO", comma ? ", " : "");
comma = 1;
}
if (t_flags2 & TF2_DROP_AF_DATA) {
db_printf("%sTF2_DROP_AF_DATA", comma ? ", " : "");
comma = 1;
}
if (t_flags2 & TF2_ECN_PERMIT) {
db_printf("%sTF2_ECN_PERMIT", comma ? ", " : "");
comma = 1;
}
if (t_flags2 & TF2_ECN_SND_CWR) {
db_printf("%sTF2_ECN_SND_CWR", comma ? ", " : "");
comma = 1;
}
if (t_flags2 & TF2_ECN_SND_ECE) {
db_printf("%sTF2_ECN_SND_ECE", comma ? ", " : "");
comma = 1;
}
if (t_flags2 & TF2_ACE_PERMIT) {
db_printf("%sTF2_ACE_PERMIT", comma ? ", " : "");
comma = 1;
}
if (t_flags2 & TF2_FBYTES_COMPLETE) {
db_printf("%sTF2_FBYTES_COMPLETE", comma ? ", " : "");
comma = 1;
}
}
static void
db_print_toobflags(char t_oobflags)
{
int comma;
comma = 0;
if (t_oobflags & TCPOOB_HAVEDATA) {
db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : "");
comma = 1;
}
if (t_oobflags & TCPOOB_HADDATA) {
db_printf("%sTCPOOB_HADDATA", comma ? ", " : "");
comma = 1;
}
}
static void
db_print_tcpcb(struct tcpcb *tp, const char *name, int indent)
{
db_print_indent(indent);
db_printf("%s at %p\n", name, tp);
indent += 2;
db_print_indent(indent);
db_printf("t_segq first: %p t_segqlen: %d t_dupacks: %d\n",
TAILQ_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks);
db_print_indent(indent);
db_printf("tt_rexmt: %p tt_persist: %p tt_keep: %p\n",
&tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep);
db_print_indent(indent);
db_printf("tt_2msl: %p tt_delack: %p t_inpcb: %p\n", &tp->t_timers->tt_2msl,
&tp->t_timers->tt_delack, tp->t_inpcb);
db_print_indent(indent);
db_printf("t_state: %d (", tp->t_state);
db_print_tstate(tp->t_state);
db_printf(")\n");
db_print_indent(indent);
db_printf("t_flags: 0x%x (", tp->t_flags);
db_print_tflags(tp->t_flags);
db_printf(")\n");
db_print_indent(indent);
db_printf("t_flags2: 0x%x (", tp->t_flags2);
db_print_tflags2(tp->t_flags2);
db_printf(")\n");
db_print_indent(indent);
db_printf("snd_una: 0x%08x snd_max: 0x%08x snd_nxt: x0%08x\n",
tp->snd_una, tp->snd_max, tp->snd_nxt);
db_print_indent(indent);
db_printf("snd_up: 0x%08x snd_wl1: 0x%08x snd_wl2: 0x%08x\n",
tp->snd_up, tp->snd_wl1, tp->snd_wl2);
db_print_indent(indent);
db_printf("iss: 0x%08x irs: 0x%08x rcv_nxt: 0x%08x\n",
tp->iss, tp->irs, tp->rcv_nxt);
db_print_indent(indent);
db_printf("rcv_adv: 0x%08x rcv_wnd: %u rcv_up: 0x%08x\n",
tp->rcv_adv, tp->rcv_wnd, tp->rcv_up);
db_print_indent(indent);
db_printf("snd_wnd: %u snd_cwnd: %u\n",
tp->snd_wnd, tp->snd_cwnd);
db_print_indent(indent);
db_printf("snd_ssthresh: %u snd_recover: "
"0x%08x\n", tp->snd_ssthresh, tp->snd_recover);
db_print_indent(indent);
db_printf("t_rcvtime: %u t_startime: %u\n",
tp->t_rcvtime, tp->t_starttime);
db_print_indent(indent);
db_printf("t_rttime: %u t_rtsq: 0x%08x\n",
tp->t_rtttime, tp->t_rtseq);
db_print_indent(indent);
db_printf("t_rxtcur: %d t_maxseg: %u t_srtt: %d\n",
tp->t_rxtcur, tp->t_maxseg, tp->t_srtt);
db_print_indent(indent);
db_printf("t_rttvar: %d t_rxtshift: %d t_rttmin: %u "
"t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin,
tp->t_rttbest);
db_print_indent(indent);
db_printf("t_rttupdated: %lu max_sndwnd: %u t_softerror: %d\n",
tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror);
db_print_indent(indent);
db_printf("t_oobflags: 0x%x (", tp->t_oobflags);
db_print_toobflags(tp->t_oobflags);
db_printf(") t_iobc: 0x%02x\n", tp->t_iobc);
db_print_indent(indent);
db_printf("snd_scale: %u rcv_scale: %u request_r_scale: %u\n",
tp->snd_scale, tp->rcv_scale, tp->request_r_scale);
db_print_indent(indent);
db_printf("ts_recent: %u ts_recent_age: %u\n",
tp->ts_recent, tp->ts_recent_age);
db_print_indent(indent);
db_printf("ts_offset: %u last_ack_sent: 0x%08x snd_cwnd_prev: "
"%u\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev);
db_print_indent(indent);
db_printf("snd_ssthresh_prev: %u snd_recover_prev: 0x%08x "
"t_badrxtwin: %u\n", tp->snd_ssthresh_prev,
tp->snd_recover_prev, tp->t_badrxtwin);
db_print_indent(indent);
db_printf("snd_numholes: %d snd_holes first: %p\n",
tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes));
db_print_indent(indent);
db_printf("snd_fack: 0x%08x rcv_numsacks: %d\n",
tp->snd_fack, tp->rcv_numsacks);
/* Skip sackblks, sackhint. */
db_print_indent(indent);
db_printf("t_rttlow: %d rfbuf_ts: %u rfbuf_cnt: %d\n",
tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt);
}
DB_SHOW_COMMAND(tcpcb, db_show_tcpcb)
{
struct tcpcb *tp;
if (!have_addr) {
db_printf("usage: show tcpcb <addr>\n");
return;
}
tp = (struct tcpcb *)addr;
db_print_tcpcb(tp, "tcpcb", 0);
}
#endif
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