0c39d38d21
and t_maxseg. This dualism emerged with T/TCP, but was not properly cleaned up after T/TCP removal. After all permutations over the years the result is that t_maxopd stores a minimum of peer offered MSS and MTU reduced by minimum protocol header. And t_maxseg stores (t_maxopd - TCPOLEN_TSTAMP_APPA) if timestamps are in action, or is equal to t_maxopd otherwise. That's a very rough estimate of MSS reduced by options length. Throughout the code it was used in places, where preciseness was not important, like cwnd or ssthresh calculations. With this change: - t_maxopd goes away. - t_maxseg now stores MSS not adjusted by options. - new function tcp_maxseg() is provided, that calculates MSS reduced by options length. The functions gives a better estimate, since it takes into account SACK state as well. Reviewed by: jtl Differential Revision: https://reviews.freebsd.org/D3593
2279 lines
55 KiB
C
2279 lines
55 KiB
C
/*-
|
|
* 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.
|
|
* 4. 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_tcpdebug.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/limits.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/refcount.h>
|
|
#include <sys/kernel.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>
|
|
|
|
#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/cc.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_var.h>
|
|
#ifdef INET6
|
|
#include <netinet/ip6.h>
|
|
#include <netinet6/in6_pcb.h>
|
|
#include <netinet6/ip6_var.h>
|
|
#include <netinet6/scope6_var.h>
|
|
#endif
|
|
#ifdef TCP_RFC7413
|
|
#include <netinet/tcp_fastopen.h>
|
|
#endif
|
|
#include <netinet/tcp_fsm.h>
|
|
#include <netinet/tcp_seq.h>
|
|
#include <netinet/tcp_timer.h>
|
|
#include <netinet/tcp_var.h>
|
|
#include <netinet/tcpip.h>
|
|
#ifdef TCPPCAP
|
|
#include <netinet/tcp_pcap.h>
|
|
#endif
|
|
#ifdef TCPDEBUG
|
|
#include <netinet/tcp_debug.h>
|
|
#endif
|
|
#ifdef TCP_OFFLOAD
|
|
#include <netinet/tcp_offload.h>
|
|
#endif
|
|
|
|
/*
|
|
* TCP protocol interface to socket abstraction.
|
|
*/
|
|
static int tcp_attach(struct socket *);
|
|
#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 *);
|
|
|
|
#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 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 = tcp_attach(so);
|
|
if (error)
|
|
goto out;
|
|
|
|
if ((so->so_options & SO_LINGER) && so->so_linger == 0)
|
|
so->so_linger = TCP_LINGERTIME;
|
|
|
|
inp = sotoinpcb(so);
|
|
tp = intotcpcb(inp);
|
|
out:
|
|
TCPDEBUG2(PRU_ATTACH);
|
|
TCP_PROBE2(debug__user, tp, PRU_ATTACH);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* tcp_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.
|
|
*
|
|
* This function can probably be re-absorbed back into tcp_usr_detach() now
|
|
* that there is a single detach path.
|
|
*/
|
|
static void
|
|
tcp_detach(struct socket *so, struct inpcb *inp)
|
|
{
|
|
struct tcpcb *tp;
|
|
|
|
INP_INFO_LOCK_ASSERT(&V_tcbinfo);
|
|
INP_WLOCK_ASSERT(inp);
|
|
|
|
KASSERT(so->so_pcb == inp, ("tcp_detach: so_pcb != inp"));
|
|
KASSERT(inp->inp_socket == so, ("tcp_detach: inp_socket != so"));
|
|
|
|
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
|
|
* three cases to consider:
|
|
*
|
|
* #1 tcp_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_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
|
|
* #3 tcp_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, we consider two
|
|
* two conditions: one in which no further processing is
|
|
* necessary (dropped || embryonic), and one in which TCP is
|
|
* not yet done, but no longer requires the socket, so the
|
|
* pcb will persist for the time being.
|
|
*
|
|
* XXXRW: Does the second case still occur?
|
|
*/
|
|
if (inp->inp_flags & INP_DROPPED ||
|
|
tp->t_state < TCPS_SYN_SENT) {
|
|
tcp_discardcb(tp);
|
|
in_pcbdetach(inp);
|
|
in_pcbfree(inp);
|
|
} else {
|
|
in_pcbdetach(inp);
|
|
INP_WUNLOCK(inp);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* pru_detach() detaches the TCP protocol from the socket.
|
|
* If the protocol state is non-embryonic, then can't
|
|
* do this directly: have to initiate a pru_disconnect(),
|
|
* which may finish later; embryonic TCB's can just
|
|
* be discarded here.
|
|
*/
|
|
static void
|
|
tcp_usr_detach(struct socket *so)
|
|
{
|
|
struct inpcb *inp;
|
|
int rlock = 0;
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("tcp_usr_detach: inp == NULL"));
|
|
if (!INP_INFO_WLOCKED(&V_tcbinfo)) {
|
|
INP_INFO_RLOCK(&V_tcbinfo);
|
|
rlock = 1;
|
|
}
|
|
INP_WLOCK(inp);
|
|
KASSERT(inp->inp_socket != NULL,
|
|
("tcp_usr_detach: inp_socket == NULL"));
|
|
tcp_detach(so, inp);
|
|
if (rlock)
|
|
INP_INFO_RUNLOCK(&V_tcbinfo);
|
|
}
|
|
|
|
#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;
|
|
struct tcpcb *tp = NULL;
|
|
struct sockaddr_in *sinp;
|
|
|
|
sinp = (struct sockaddr_in *)nam;
|
|
if (nam->sa_len != sizeof (*sinp))
|
|
return (EINVAL);
|
|
/*
|
|
* Must check for multicast addresses and disallow binding
|
|
* to them.
|
|
*/
|
|
if (sinp->sin_family == AF_INET &&
|
|
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;
|
|
}
|
|
tp = intotcpcb(inp);
|
|
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;
|
|
struct tcpcb *tp = NULL;
|
|
struct sockaddr_in6 *sin6p;
|
|
|
|
sin6p = (struct sockaddr_in6 *)nam;
|
|
if (nam->sa_len != sizeof (*sin6p))
|
|
return (EINVAL);
|
|
/*
|
|
* Must check for multicast addresses and disallow binding
|
|
* to them.
|
|
*/
|
|
if (sin6p->sin6_family == AF_INET6 &&
|
|
IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr))
|
|
return (EAFNOSUPPORT);
|
|
|
|
TCPDEBUG0;
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL"));
|
|
INP_WLOCK(inp);
|
|
if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
tp = intotcpcb(inp);
|
|
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(&sin6p->sin6_addr))
|
|
inp->inp_vflag |= INP_IPV4;
|
|
else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
|
|
struct sockaddr_in sin;
|
|
|
|
in6_sin6_2_sin(&sin, sin6p);
|
|
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:
|
|
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);
|
|
INP_HASH_WLOCK(&V_tcbinfo);
|
|
if (error == 0 && inp->inp_lport == 0)
|
|
error = in_pcbbind(inp, (struct sockaddr *)0, 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
|
|
}
|
|
SOCK_UNLOCK(so);
|
|
|
|
#ifdef TCP_RFC7413
|
|
if (tp->t_flags & TF_FASTOPEN)
|
|
tp->t_tfo_pending = tcp_fastopen_alloc_counter();
|
|
#endif
|
|
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;
|
|
|
|
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;
|
|
}
|
|
tp = intotcpcb(inp);
|
|
TCPDEBUG1();
|
|
SOCK_LOCK(so);
|
|
error = solisten_proto_check(so);
|
|
INP_HASH_WLOCK(&V_tcbinfo);
|
|
if (error == 0 && 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, (struct sockaddr *)0, 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
|
|
}
|
|
SOCK_UNLOCK(so);
|
|
|
|
#ifdef TCP_RFC7413
|
|
if (tp->t_flags & TF_FASTOPEN)
|
|
tp->t_tfo_pending = tcp_fastopen_alloc_counter();
|
|
#endif
|
|
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)
|
|
{
|
|
int error = 0;
|
|
struct inpcb *inp;
|
|
struct tcpcb *tp = NULL;
|
|
struct sockaddr_in *sinp;
|
|
|
|
sinp = (struct sockaddr_in *)nam;
|
|
if (nam->sa_len != sizeof (*sinp))
|
|
return (EINVAL);
|
|
/*
|
|
* Must disallow TCP ``connections'' to multicast addresses.
|
|
*/
|
|
if (sinp->sin_family == AF_INET
|
|
&& IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
|
|
return (EAFNOSUPPORT);
|
|
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;
|
|
}
|
|
tp = intotcpcb(inp);
|
|
TCPDEBUG1();
|
|
if ((error = tcp_connect(tp, nam, td)) != 0)
|
|
goto out;
|
|
#ifdef TCP_OFFLOAD
|
|
if (registered_toedevs > 0 &&
|
|
(so->so_options & SO_NO_OFFLOAD) == 0 &&
|
|
(error = tcp_offload_connect(so, nam)) == 0)
|
|
goto out;
|
|
#endif
|
|
tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp));
|
|
error = tp->t_fb->tfb_tcp_output(tp);
|
|
out:
|
|
TCPDEBUG2(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)
|
|
{
|
|
int error = 0;
|
|
struct inpcb *inp;
|
|
struct tcpcb *tp = NULL;
|
|
struct sockaddr_in6 *sin6p;
|
|
|
|
TCPDEBUG0;
|
|
|
|
sin6p = (struct sockaddr_in6 *)nam;
|
|
if (nam->sa_len != sizeof (*sin6p))
|
|
return (EINVAL);
|
|
/*
|
|
* Must disallow TCP ``connections'' to multicast addresses.
|
|
*/
|
|
if (sin6p->sin6_family == AF_INET6
|
|
&& IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr))
|
|
return (EAFNOSUPPORT);
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("tcp6_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;
|
|
}
|
|
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(&sin6p->sin6_addr)) {
|
|
struct sockaddr_in sin;
|
|
|
|
if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
in6_sin6_2_sin(&sin, sin6p);
|
|
inp->inp_vflag |= INP_IPV4;
|
|
inp->inp_vflag &= ~INP_IPV6;
|
|
if ((error = prison_remote_ip4(td->td_ucred,
|
|
&sin.sin_addr)) != 0)
|
|
goto out;
|
|
if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0)
|
|
goto out;
|
|
#ifdef TCP_OFFLOAD
|
|
if (registered_toedevs > 0 &&
|
|
(so->so_options & SO_NO_OFFLOAD) == 0 &&
|
|
(error = tcp_offload_connect(so, nam)) == 0)
|
|
goto out;
|
|
#endif
|
|
error = tp->t_fb->tfb_tcp_output(tp);
|
|
goto out;
|
|
}
|
|
#endif
|
|
inp->inp_vflag &= ~INP_IPV4;
|
|
inp->inp_vflag |= INP_IPV6;
|
|
inp->inp_inc.inc_flags |= INC_ISIPV6;
|
|
if ((error = prison_remote_ip6(td->td_ucred, &sin6p->sin6_addr)) != 0)
|
|
goto out;
|
|
if ((error = tcp6_connect(tp, nam, td)) != 0)
|
|
goto out;
|
|
#ifdef TCP_OFFLOAD
|
|
if (registered_toedevs > 0 &&
|
|
(so->so_options & SO_NO_OFFLOAD) == 0 &&
|
|
(error = tcp_offload_connect(so, nam)) == 0)
|
|
goto out;
|
|
#endif
|
|
tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp));
|
|
error = tp->t_fb->tfb_tcp_output(tp);
|
|
|
|
out:
|
|
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;
|
|
int error = 0;
|
|
|
|
TCPDEBUG0;
|
|
INP_INFO_RLOCK(&V_tcbinfo);
|
|
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);
|
|
INP_INFO_RUNLOCK(&V_tcbinfo);
|
|
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;
|
|
struct tcpcb *tp = NULL;
|
|
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;
|
|
}
|
|
tp = intotcpcb(inp);
|
|
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;
|
|
struct tcpcb *tp = NULL;
|
|
struct in_addr addr;
|
|
struct in6_addr addr6;
|
|
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"));
|
|
INP_INFO_RLOCK(&V_tcbinfo);
|
|
INP_WLOCK(inp);
|
|
if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
|
|
error = ECONNABORTED;
|
|
goto out;
|
|
}
|
|
tp = intotcpcb(inp);
|
|
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);
|
|
INP_INFO_RUNLOCK(&V_tcbinfo);
|
|
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;
|
|
|
|
TCPDEBUG0;
|
|
INP_INFO_RLOCK(&V_tcbinfo);
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("inp == NULL"));
|
|
INP_WLOCK(inp);
|
|
if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
|
|
error = ECONNRESET;
|
|
goto out;
|
|
}
|
|
tp = intotcpcb(inp);
|
|
TCPDEBUG1();
|
|
socantsendmore(so);
|
|
tcp_usrclosed(tp);
|
|
if (!(inp->inp_flags & INP_DROPPED))
|
|
error = tp->t_fb->tfb_tcp_output(tp);
|
|
|
|
out:
|
|
TCPDEBUG2(PRU_SHUTDOWN);
|
|
TCP_PROBE2(debug__user, tp, PRU_SHUTDOWN);
|
|
INP_WUNLOCK(inp);
|
|
INP_INFO_RUNLOCK(&V_tcbinfo);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* After a receive, possibly send window update to peer.
|
|
*/
|
|
static int
|
|
tcp_usr_rcvd(struct socket *so, int flags)
|
|
{
|
|
struct inpcb *inp;
|
|
struct tcpcb *tp = NULL;
|
|
int 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)) {
|
|
error = ECONNRESET;
|
|
goto out;
|
|
}
|
|
tp = intotcpcb(inp);
|
|
TCPDEBUG1();
|
|
#ifdef TCP_RFC7413
|
|
/*
|
|
* 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 ((tp->t_flags & TF_FASTOPEN) &&
|
|
(tp->t_state == TCPS_SYN_RECEIVED))
|
|
goto out;
|
|
#endif
|
|
#ifdef TCP_OFFLOAD
|
|
if (tp->t_flags & TF_TOE)
|
|
tcp_offload_rcvd(tp);
|
|
else
|
|
#endif
|
|
tp->t_fb->tfb_tcp_output(tp);
|
|
|
|
out:
|
|
TCPDEBUG2(PRU_RCVD);
|
|
TCP_PROBE2(debug__user, tp, PRU_RCVD);
|
|
INP_WUNLOCK(inp);
|
|
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)
|
|
{
|
|
int error = 0;
|
|
struct inpcb *inp;
|
|
struct tcpcb *tp = NULL;
|
|
#ifdef INET6
|
|
int isipv6;
|
|
#endif
|
|
TCPDEBUG0;
|
|
|
|
/*
|
|
* We require the pcbinfo lock if we will close the socket as part of
|
|
* this call.
|
|
*/
|
|
if (flags & PRUS_EOF)
|
|
INP_INFO_RLOCK(&V_tcbinfo);
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL"));
|
|
INP_WLOCK(inp);
|
|
if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
|
|
if (control)
|
|
m_freem(control);
|
|
/*
|
|
* In case of PRUS_NOTREADY, tcp_usr_ready() is responsible
|
|
* for freeing memory.
|
|
*/
|
|
if (m && (flags & PRUS_NOTREADY) == 0)
|
|
m_freem(m);
|
|
error = ECONNRESET;
|
|
goto out;
|
|
}
|
|
#ifdef INET6
|
|
isipv6 = nam && nam->sa_family == AF_INET6;
|
|
#endif /* INET6 */
|
|
tp = intotcpcb(inp);
|
|
TCPDEBUG1();
|
|
if (control) {
|
|
/* TCP doesn't do control messages (rights, creds, etc) */
|
|
if (control->m_len) {
|
|
m_freem(control);
|
|
if (m)
|
|
m_freem(m);
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
m_freem(control); /* empty control, just free it */
|
|
}
|
|
if (!(flags & PRUS_OOB)) {
|
|
sbappendstream(&so->so_snd, m, flags);
|
|
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.
|
|
*/
|
|
#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, nam, td);
|
|
#endif
|
|
if (error)
|
|
goto out;
|
|
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.
|
|
*/
|
|
INP_INFO_RLOCK_ASSERT(&V_tcbinfo);
|
|
socantsendmore(so);
|
|
tcp_usrclosed(tp);
|
|
}
|
|
if (!(inp->inp_flags & INP_DROPPED) &&
|
|
!(flags & PRUS_NOTREADY)) {
|
|
if (flags & PRUS_MORETOCOME)
|
|
tp->t_flags |= TF_MORETOCOME;
|
|
error = tp->t_fb->tfb_tcp_output(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);
|
|
m_freem(m);
|
|
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.
|
|
*/
|
|
sbappendstream_locked(&so->so_snd, m, flags);
|
|
SOCKBUF_UNLOCK(&so->so_snd);
|
|
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.
|
|
*/
|
|
#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, nam, td);
|
|
#endif
|
|
if (error)
|
|
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)) {
|
|
tp->t_flags |= TF_FORCEDATA;
|
|
error = tp->t_fb->tfb_tcp_output(tp);
|
|
tp->t_flags &= ~TF_FORCEDATA;
|
|
}
|
|
}
|
|
out:
|
|
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));
|
|
INP_WUNLOCK(inp);
|
|
if (flags & PRUS_EOF)
|
|
INP_INFO_RUNLOCK(&V_tcbinfo);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
tcp_usr_ready(struct socket *so, struct mbuf *m, int count)
|
|
{
|
|
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);
|
|
for (int i = 0; i < count; i++)
|
|
m = m_free(m);
|
|
return (ECONNRESET);
|
|
}
|
|
tp = intotcpcb(inp);
|
|
|
|
SOCKBUF_LOCK(&so->so_snd);
|
|
error = sbready(&so->so_snd, m, count);
|
|
SOCKBUF_UNLOCK(&so->so_snd);
|
|
if (error == 0)
|
|
error = tp->t_fb->tfb_tcp_output(tp);
|
|
INP_WUNLOCK(inp);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Abort the TCP. Drop the connection abruptly.
|
|
*/
|
|
static void
|
|
tcp_usr_abort(struct socket *so)
|
|
{
|
|
struct inpcb *inp;
|
|
struct tcpcb *tp = NULL;
|
|
TCPDEBUG0;
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL"));
|
|
|
|
INP_INFO_RLOCK(&V_tcbinfo);
|
|
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();
|
|
tcp_drop(tp, ECONNABORTED);
|
|
TCPDEBUG2(PRU_ABORT);
|
|
TCP_PROBE2(debug__user, tp, PRU_ABORT);
|
|
}
|
|
if (!(inp->inp_flags & INP_DROPPED)) {
|
|
SOCK_LOCK(so);
|
|
so->so_state |= SS_PROTOREF;
|
|
SOCK_UNLOCK(so);
|
|
inp->inp_flags |= INP_SOCKREF;
|
|
}
|
|
INP_WUNLOCK(inp);
|
|
INP_INFO_RUNLOCK(&V_tcbinfo);
|
|
}
|
|
|
|
/*
|
|
* TCP socket is closed. Start friendly disconnect.
|
|
*/
|
|
static void
|
|
tcp_usr_close(struct socket *so)
|
|
{
|
|
struct inpcb *inp;
|
|
struct tcpcb *tp = NULL;
|
|
TCPDEBUG0;
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL"));
|
|
|
|
INP_INFO_RLOCK(&V_tcbinfo);
|
|
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);
|
|
TCPDEBUG1();
|
|
tcp_disconnect(tp);
|
|
TCPDEBUG2(PRU_CLOSE);
|
|
TCP_PROBE2(debug__user, tp, PRU_CLOSE);
|
|
}
|
|
if (!(inp->inp_flags & INP_DROPPED)) {
|
|
SOCK_LOCK(so);
|
|
so->so_state |= SS_PROTOREF;
|
|
SOCK_UNLOCK(so);
|
|
inp->inp_flags |= INP_SOCKREF;
|
|
}
|
|
INP_WUNLOCK(inp);
|
|
INP_INFO_RUNLOCK(&V_tcbinfo);
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
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 pr_usrreqs tcp_usrreqs = {
|
|
.pru_abort = tcp_usr_abort,
|
|
.pru_accept = tcp_usr_accept,
|
|
.pru_attach = tcp_usr_attach,
|
|
.pru_bind = tcp_usr_bind,
|
|
.pru_connect = tcp_usr_connect,
|
|
.pru_control = in_control,
|
|
.pru_detach = tcp_usr_detach,
|
|
.pru_disconnect = tcp_usr_disconnect,
|
|
.pru_listen = tcp_usr_listen,
|
|
.pru_peeraddr = in_getpeeraddr,
|
|
.pru_rcvd = tcp_usr_rcvd,
|
|
.pru_rcvoob = tcp_usr_rcvoob,
|
|
.pru_send = tcp_usr_send,
|
|
.pru_ready = tcp_usr_ready,
|
|
.pru_shutdown = tcp_usr_shutdown,
|
|
.pru_sockaddr = in_getsockaddr,
|
|
.pru_sosetlabel = in_pcbsosetlabel,
|
|
.pru_close = tcp_usr_close,
|
|
};
|
|
#endif /* INET */
|
|
|
|
#ifdef INET6
|
|
struct pr_usrreqs tcp6_usrreqs = {
|
|
.pru_abort = tcp_usr_abort,
|
|
.pru_accept = tcp6_usr_accept,
|
|
.pru_attach = tcp_usr_attach,
|
|
.pru_bind = tcp6_usr_bind,
|
|
.pru_connect = tcp6_usr_connect,
|
|
.pru_control = in6_control,
|
|
.pru_detach = tcp_usr_detach,
|
|
.pru_disconnect = tcp_usr_disconnect,
|
|
.pru_listen = tcp6_usr_listen,
|
|
.pru_peeraddr = in6_mapped_peeraddr,
|
|
.pru_rcvd = tcp_usr_rcvd,
|
|
.pru_rcvoob = tcp_usr_rcvoob,
|
|
.pru_send = tcp_usr_send,
|
|
.pru_ready = tcp_usr_ready,
|
|
.pru_shutdown = tcp_usr_shutdown,
|
|
.pru_sockaddr = in6_mapped_sockaddr,
|
|
.pru_sosetlabel = in_pcbsosetlabel,
|
|
.pru_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;
|
|
|
|
INP_WLOCK_ASSERT(inp);
|
|
INP_HASH_WLOCK(&V_tcbinfo);
|
|
|
|
if (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;
|
|
}
|
|
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(tp);
|
|
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 (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(tp);
|
|
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;
|
|
}
|
|
|
|
ti->tcpi_rto = tp->t_rxtcur * tick;
|
|
ti->tcpi_last_data_recv = (long)(ticks - (int)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;
|
|
if (tp->t_flags & TF_TOE)
|
|
ti->tcpi_options |= TCPI_OPT_TOE;
|
|
ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack;
|
|
ti->tcpi_rcv_ooopack = tp->t_rcvoopack;
|
|
ti->tcpi_snd_zerowin = tp->t_sndzerowin;
|
|
}
|
|
|
|
/*
|
|
* 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(inp) do { \
|
|
INP_WLOCK(inp); \
|
|
if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { \
|
|
INP_WUNLOCK(inp); \
|
|
return (ECONNRESET); \
|
|
} \
|
|
tp = intotcpcb(inp); \
|
|
} while(0)
|
|
|
|
int
|
|
tcp_ctloutput(struct socket *so, struct sockopt *sopt)
|
|
{
|
|
int error;
|
|
struct inpcb *inp;
|
|
struct tcpcb *tp;
|
|
struct tcp_function_block *blk;
|
|
struct tcp_function_set fsn;
|
|
|
|
error = 0;
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL"));
|
|
INP_WLOCK(inp);
|
|
if (sopt->sopt_level != IPPROTO_TCP) {
|
|
#ifdef INET6
|
|
if (inp->inp_vflag & INP_IPV6PROTO) {
|
|
INP_WUNLOCK(inp);
|
|
error = ip6_ctloutput(so, sopt);
|
|
}
|
|
#endif /* INET6 */
|
|
#if defined(INET6) && defined(INET)
|
|
else
|
|
#endif
|
|
#ifdef INET
|
|
{
|
|
INP_WUNLOCK(inp);
|
|
error = ip_ctloutput(so, sopt);
|
|
}
|
|
#endif
|
|
return (error);
|
|
}
|
|
if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
|
|
INP_WUNLOCK(inp);
|
|
return (ECONNRESET);
|
|
}
|
|
tp = intotcpcb(inp);
|
|
/*
|
|
* Protect the TCP option TCP_FUNCTION_BLK so
|
|
* that a sub-function can *never* overwrite this.
|
|
*/
|
|
if ((sopt->sopt_dir == SOPT_SET) &&
|
|
(sopt->sopt_name == TCP_FUNCTION_BLK)) {
|
|
INP_WUNLOCK(inp);
|
|
error = sooptcopyin(sopt, &fsn, sizeof fsn,
|
|
sizeof fsn);
|
|
if (error)
|
|
return (error);
|
|
INP_WLOCK_RECHECK(inp);
|
|
if (tp->t_state != TCPS_CLOSED) {
|
|
/*
|
|
* The user has advanced the state
|
|
* past the initial point, we can't
|
|
* switch since we are down the road
|
|
* and a new set of functions may
|
|
* not be compatibile.
|
|
*/
|
|
INP_WUNLOCK(inp);
|
|
return(EINVAL);
|
|
}
|
|
blk = find_and_ref_tcp_functions(&fsn);
|
|
if (blk == NULL) {
|
|
INP_WUNLOCK(inp);
|
|
return (ENOENT);
|
|
}
|
|
if (tp->t_fb != blk) {
|
|
if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) {
|
|
refcount_release(&blk->tfb_refcnt);
|
|
INP_WUNLOCK(inp);
|
|
return (ENOENT);
|
|
}
|
|
/*
|
|
* Release the old refcnt, the
|
|
* lookup acquires a ref on the
|
|
* new one.
|
|
*/
|
|
if (tp->t_fb->tfb_tcp_fb_fini)
|
|
(*tp->t_fb->tfb_tcp_fb_fini)(tp);
|
|
refcount_release(&tp->t_fb->tfb_refcnt);
|
|
tp->t_fb = blk;
|
|
if (tp->t_fb->tfb_tcp_fb_init) {
|
|
(*tp->t_fb->tfb_tcp_fb_init)(tp);
|
|
}
|
|
}
|
|
#ifdef TCP_OFFLOAD
|
|
if (tp->t_flags & TF_TOE) {
|
|
tcp_offload_ctloutput(tp, sopt->sopt_dir,
|
|
sopt->sopt_name);
|
|
}
|
|
#endif
|
|
INP_WUNLOCK(inp);
|
|
return (error);
|
|
} else if ((sopt->sopt_dir == SOPT_GET) &&
|
|
(sopt->sopt_name == TCP_FUNCTION_BLK)) {
|
|
strcpy(fsn.function_set_name, tp->t_fb->tfb_tcp_block_name);
|
|
fsn.pcbcnt = tp->t_fb->tfb_refcnt;
|
|
INP_WUNLOCK(inp);
|
|
error = sooptcopyout(sopt, &fsn, sizeof fsn);
|
|
return (error);
|
|
}
|
|
/* Pass in the INP locked, called must unlock it */
|
|
return (tp->t_fb->tfb_tcp_ctloutput(so, sopt, inp, tp));
|
|
}
|
|
|
|
int
|
|
tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp)
|
|
{
|
|
int error, opt, optval;
|
|
u_int ui;
|
|
struct tcp_info ti;
|
|
struct cc_algo *algo;
|
|
char buf[TCP_CA_NAME_MAX];
|
|
|
|
switch (sopt->sopt_dir) {
|
|
case SOPT_SET:
|
|
switch (sopt->sopt_name) {
|
|
#ifdef TCP_SIGNATURE
|
|
case TCP_MD5SIG:
|
|
INP_WUNLOCK(inp);
|
|
error = sooptcopyin(sopt, &optval, sizeof optval,
|
|
sizeof optval);
|
|
if (error)
|
|
return (error);
|
|
|
|
INP_WLOCK_RECHECK(inp);
|
|
if (optval > 0)
|
|
tp->t_flags |= TF_SIGNATURE;
|
|
else
|
|
tp->t_flags &= ~TF_SIGNATURE;
|
|
goto unlock_and_done;
|
|
#endif /* TCP_SIGNATURE */
|
|
|
|
case TCP_NODELAY:
|
|
case TCP_NOOPT:
|
|
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;
|
|
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))
|
|
error = tp->t_fb->tfb_tcp_output(tp);
|
|
}
|
|
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_CONGESTION:
|
|
INP_WUNLOCK(inp);
|
|
bzero(buf, sizeof(buf));
|
|
error = sooptcopyin(sopt, &buf, sizeof(buf), 1);
|
|
if (error)
|
|
break;
|
|
INP_WLOCK_RECHECK(inp);
|
|
/*
|
|
* Return EINVAL if we can't find the requested cc algo.
|
|
*/
|
|
error = EINVAL;
|
|
CC_LIST_RLOCK();
|
|
STAILQ_FOREACH(algo, &cc_list, entries) {
|
|
if (strncmp(buf, algo->name, TCP_CA_NAME_MAX)
|
|
== 0) {
|
|
/* We've found the requested algo. */
|
|
error = 0;
|
|
/*
|
|
* We hold a write lock over the tcb
|
|
* so it's safe to do these things
|
|
* without ordering concerns.
|
|
*/
|
|
if (CC_ALGO(tp)->cb_destroy != NULL)
|
|
CC_ALGO(tp)->cb_destroy(tp->ccv);
|
|
CC_ALGO(tp) = algo;
|
|
/*
|
|
* If something goes pear shaped
|
|
* initialising the new algo,
|
|
* fall back to newreno (which
|
|
* does not require initialisation).
|
|
*/
|
|
if (algo->cb_init != NULL)
|
|
if (algo->cb_init(tp->ccv) > 0) {
|
|
CC_ALGO(tp) = &newreno_cc_algo;
|
|
/*
|
|
* The only reason init
|
|
* should fail is
|
|
* because of malloc.
|
|
*/
|
|
error = ENOMEM;
|
|
}
|
|
break; /* Break the STAILQ_FOREACH. */
|
|
}
|
|
}
|
|
CC_LIST_RUNLOCK();
|
|
goto unlock_and_done;
|
|
|
|
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_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
|
|
|
|
#ifdef TCP_RFC7413
|
|
case TCP_FASTOPEN:
|
|
INP_WUNLOCK(inp);
|
|
if (!V_tcp_fastopen_enabled)
|
|
return (EPERM);
|
|
|
|
error = sooptcopyin(sopt, &optval, sizeof optval,
|
|
sizeof optval);
|
|
if (error)
|
|
return (error);
|
|
|
|
INP_WLOCK_RECHECK(inp);
|
|
if (optval) {
|
|
tp->t_flags |= TF_FASTOPEN;
|
|
if ((tp->t_state == TCPS_LISTEN) &&
|
|
(tp->t_tfo_pending == NULL))
|
|
tp->t_tfo_pending =
|
|
tcp_fastopen_alloc_counter();
|
|
} else
|
|
tp->t_flags &= ~TF_FASTOPEN;
|
|
goto unlock_and_done;
|
|
#endif
|
|
|
|
default:
|
|
INP_WUNLOCK(inp);
|
|
error = ENOPROTOOPT;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case SOPT_GET:
|
|
tp = intotcpcb(inp);
|
|
switch (sopt->sopt_name) {
|
|
#ifdef TCP_SIGNATURE
|
|
case TCP_MD5SIG:
|
|
optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0;
|
|
INP_WUNLOCK(inp);
|
|
error = sooptcopyout(sopt, &optval, sizeof optval);
|
|
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_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_CONGESTION:
|
|
bzero(buf, sizeof(buf));
|
|
strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX);
|
|
INP_WUNLOCK(inp);
|
|
error = sooptcopyout(sopt, buf, TCP_CA_NAME_MAX);
|
|
break;
|
|
case TCP_KEEPIDLE:
|
|
case TCP_KEEPINTVL:
|
|
case TCP_KEEPINIT:
|
|
case TCP_KEEPCNT:
|
|
switch (sopt->sopt_name) {
|
|
case TCP_KEEPIDLE:
|
|
ui = tp->t_keepidle / hz;
|
|
break;
|
|
case TCP_KEEPINTVL:
|
|
ui = tp->t_keepintvl / hz;
|
|
break;
|
|
case TCP_KEEPINIT:
|
|
ui = tp->t_keepinit / hz;
|
|
break;
|
|
case TCP_KEEPCNT:
|
|
ui = tp->t_keepcnt;
|
|
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
|
|
|
|
#ifdef TCP_RFC7413
|
|
case TCP_FASTOPEN:
|
|
optval = tp->t_flags & TF_FASTOPEN;
|
|
INP_WUNLOCK(inp);
|
|
error = sooptcopyout(sopt, &optval, sizeof optval);
|
|
break;
|
|
#endif
|
|
default:
|
|
INP_WUNLOCK(inp);
|
|
error = ENOPROTOOPT;
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
return (error);
|
|
}
|
|
#undef INP_WLOCK_RECHECK
|
|
|
|
/*
|
|
* Attach TCP protocol to socket, allocating
|
|
* internet protocol control block, tcp control block,
|
|
* bufer space, and entering LISTEN state if to accept connections.
|
|
*/
|
|
static int
|
|
tcp_attach(struct socket *so)
|
|
{
|
|
struct tcpcb *tp;
|
|
struct inpcb *inp;
|
|
int error;
|
|
|
|
if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
|
|
error = soreserve(so, V_tcp_sendspace, V_tcp_recvspace);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
so->so_rcv.sb_flags |= SB_AUTOSIZE;
|
|
so->so_snd.sb_flags |= SB_AUTOSIZE;
|
|
INP_INFO_RLOCK(&V_tcbinfo);
|
|
error = in_pcballoc(so, &V_tcbinfo);
|
|
if (error) {
|
|
INP_INFO_RUNLOCK(&V_tcbinfo);
|
|
return (error);
|
|
}
|
|
inp = sotoinpcb(so);
|
|
#ifdef INET6
|
|
if (inp->inp_vflag & INP_IPV6PROTO) {
|
|
inp->inp_vflag |= INP_IPV6;
|
|
inp->in6p_hops = -1; /* use kernel default */
|
|
}
|
|
else
|
|
#endif
|
|
inp->inp_vflag |= INP_IPV4;
|
|
tp = tcp_newtcpcb(inp);
|
|
if (tp == NULL) {
|
|
in_pcbdetach(inp);
|
|
in_pcbfree(inp);
|
|
INP_INFO_RUNLOCK(&V_tcbinfo);
|
|
return (ENOBUFS);
|
|
}
|
|
tp->t_state = TCPS_CLOSED;
|
|
INP_WUNLOCK(inp);
|
|
INP_INFO_RUNLOCK(&V_tcbinfo);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
|
|
INP_INFO_RLOCK_ASSERT(&V_tcbinfo);
|
|
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 = 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))
|
|
tp->t_fb->tfb_tcp_output(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)
|
|
{
|
|
|
|
INP_INFO_RLOCK_ASSERT(&V_tcbinfo);
|
|
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_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_MORETOCOME) {
|
|
db_printf("%sTF_MORETOCOME", comma ? ", " : "");
|
|
comma = 1;
|
|
}
|
|
if (t_flags & TF_LQ_OVERFLOW) {
|
|
db_printf("%sTF_LQ_OVERFLOW", 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_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_ECN_PERMIT) {
|
|
db_printf("%sTF_ECN_PERMIT", comma ? ", " : "");
|
|
comma = 1;
|
|
}
|
|
if (t_flags & TF_FASTOPEN) {
|
|
db_printf("%sTF_FASTOPEN", 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",
|
|
LIST_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("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: %lu rcv_up: 0x%08x\n",
|
|
tp->rcv_adv, tp->rcv_wnd, tp->rcv_up);
|
|
|
|
db_print_indent(indent);
|
|
db_printf("snd_wnd: %lu snd_cwnd: %lu\n",
|
|
tp->snd_wnd, tp->snd_cwnd);
|
|
|
|
db_print_indent(indent);
|
|
db_printf("snd_ssthresh: %lu 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: %lu 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: "
|
|
"%lu\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev);
|
|
|
|
db_print_indent(indent);
|
|
db_printf("snd_ssthresh_prev: %lu 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 sack_newdata: "
|
|
"0x%08x\n", tp->snd_fack, tp->rcv_numsacks, tp->sack_newdata);
|
|
|
|
/* 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
|