1152 lines
27 KiB
C
1152 lines
27 KiB
C
/*
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* Copyright (c) 1982, 1986, 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* From: @(#)tcp_usrreq.c 8.2 (Berkeley) 1/3/94
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* $FreeBSD$
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*/
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#include "opt_ipsec.h"
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#include "opt_inet6.h"
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#include "opt_tcpdebug.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.h>
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#include <sys/mbuf.h>
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#ifdef INET6
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#include <sys/domain.h>
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#endif /* INET6 */
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/protosw.h>
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#include <sys/proc.h>
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#include <sys/jail.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#ifdef INET6
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#include <netinet/ip6.h>
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#endif
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#include <netinet/in_pcb.h>
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#ifdef INET6
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#include <netinet6/in6_pcb.h>
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#endif
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#include <netinet/in_var.h>
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#include <netinet/ip_var.h>
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#ifdef INET6
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#include <netinet6/ip6_var.h>
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#endif
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#include <netinet/tcp.h>
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#include <netinet/tcp_fsm.h>
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#include <netinet/tcp_seq.h>
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#include <netinet/tcp_timer.h>
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#include <netinet/tcp_var.h>
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#include <netinet/tcpip.h>
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#ifdef TCPDEBUG
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#include <netinet/tcp_debug.h>
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#endif
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#ifdef IPSEC
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#include <netinet6/ipsec.h>
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#endif /*IPSEC*/
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/*
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* TCP protocol interface to socket abstraction.
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*/
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extern char *tcpstates[]; /* XXX ??? */
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static int tcp_attach __P((struct socket *, struct proc *));
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static int tcp_connect __P((struct tcpcb *, struct sockaddr *,
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struct proc *));
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#ifdef INET6
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static int tcp6_connect __P((struct tcpcb *, struct sockaddr *,
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struct proc *));
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#endif /* INET6 */
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static struct tcpcb *
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tcp_disconnect __P((struct tcpcb *));
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static struct tcpcb *
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tcp_usrclosed __P((struct tcpcb *));
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#ifdef TCPDEBUG
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#define TCPDEBUG0 int ostate = 0
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#define TCPDEBUG1() ostate = tp ? tp->t_state : 0
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#define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \
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tcp_trace(TA_USER, ostate, tp, 0, 0, req)
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#else
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#define TCPDEBUG0
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#define TCPDEBUG1()
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#define TCPDEBUG2(req)
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#endif
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/*
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* TCP attaches to socket via pru_attach(), reserving space,
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* and an internet control block.
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*/
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static int
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tcp_usr_attach(struct socket *so, int proto, struct proc *p)
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{
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int s = splnet();
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int error;
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struct inpcb *inp = sotoinpcb(so);
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struct tcpcb *tp = 0;
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TCPDEBUG0;
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TCPDEBUG1();
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if (inp) {
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error = EISCONN;
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goto out;
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}
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error = tcp_attach(so, p);
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if (error)
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goto out;
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if ((so->so_options & SO_LINGER) && so->so_linger == 0)
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so->so_linger = TCP_LINGERTIME;
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tp = sototcpcb(so);
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out:
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TCPDEBUG2(PRU_ATTACH);
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splx(s);
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return error;
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}
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/*
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* pru_detach() detaches the TCP protocol from the socket.
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* If the protocol state is non-embryonic, then can't
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* do this directly: have to initiate a pru_disconnect(),
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* which may finish later; embryonic TCB's can just
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* be discarded here.
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*/
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static int
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tcp_usr_detach(struct socket *so)
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{
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int s = splnet();
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int error = 0;
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struct inpcb *inp = sotoinpcb(so);
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struct tcpcb *tp;
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TCPDEBUG0;
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if (inp == 0) {
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splx(s);
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return EINVAL; /* XXX */
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}
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tp = intotcpcb(inp);
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TCPDEBUG1();
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tp = tcp_disconnect(tp);
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TCPDEBUG2(PRU_DETACH);
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splx(s);
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return error;
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}
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#define COMMON_START() TCPDEBUG0; \
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do { \
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if (inp == 0) { \
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splx(s); \
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return EINVAL; \
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} \
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tp = intotcpcb(inp); \
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TCPDEBUG1(); \
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} while(0)
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#define COMMON_END(req) out: TCPDEBUG2(req); splx(s); return error; goto out
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/*
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* Give the socket an address.
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*/
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static int
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tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
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{
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int s = splnet();
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int error = 0;
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struct inpcb *inp = sotoinpcb(so);
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struct tcpcb *tp;
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struct sockaddr_in *sinp;
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COMMON_START();
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/*
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* Must check for multicast addresses and disallow binding
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* to them.
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*/
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sinp = (struct sockaddr_in *)nam;
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if (sinp->sin_family == AF_INET &&
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IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
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error = EAFNOSUPPORT;
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goto out;
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}
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error = in_pcbbind(inp, nam, p);
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if (error)
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goto out;
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COMMON_END(PRU_BIND);
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}
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#ifdef INET6
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static int
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tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
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{
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int s = splnet();
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int error = 0;
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struct inpcb *inp = sotoinpcb(so);
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struct tcpcb *tp;
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struct sockaddr_in6 *sin6p;
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COMMON_START();
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/*
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* Must check for multicast addresses and disallow binding
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* to them.
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*/
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sin6p = (struct sockaddr_in6 *)nam;
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if (sin6p->sin6_family == AF_INET6 &&
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IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
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error = EAFNOSUPPORT;
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goto out;
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}
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inp->inp_vflag &= ~INP_IPV4;
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inp->inp_vflag |= INP_IPV6;
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if ((inp->inp_flags & IN6P_BINDV6ONLY) == 0) {
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if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr))
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inp->inp_vflag |= INP_IPV4;
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else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
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struct sockaddr_in sin;
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in6_sin6_2_sin(&sin, sin6p);
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inp->inp_vflag |= INP_IPV4;
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inp->inp_vflag &= ~INP_IPV6;
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error = in_pcbbind(inp, (struct sockaddr *)&sin, p);
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goto out;
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}
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}
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error = in6_pcbbind(inp, nam, p);
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if (error)
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goto out;
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COMMON_END(PRU_BIND);
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}
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#endif /* INET6 */
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/*
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* Prepare to accept connections.
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*/
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static int
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tcp_usr_listen(struct socket *so, struct proc *p)
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{
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int s = splnet();
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int error = 0;
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struct inpcb *inp = sotoinpcb(so);
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struct tcpcb *tp;
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COMMON_START();
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if (inp->inp_lport == 0)
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error = in_pcbbind(inp, (struct sockaddr *)0, p);
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if (error == 0)
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tp->t_state = TCPS_LISTEN;
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COMMON_END(PRU_LISTEN);
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}
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#ifdef INET6
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static int
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tcp6_usr_listen(struct socket *so, struct proc *p)
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{
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int s = splnet();
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int error = 0;
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struct inpcb *inp = sotoinpcb(so);
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struct tcpcb *tp;
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COMMON_START();
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if (inp->inp_lport == 0) {
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inp->inp_vflag &= ~INP_IPV4;
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if ((inp->inp_flags & IN6P_BINDV6ONLY) == 0)
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inp->inp_vflag |= INP_IPV4;
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error = in6_pcbbind(inp, (struct sockaddr *)0, p);
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}
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if (error == 0)
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tp->t_state = TCPS_LISTEN;
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COMMON_END(PRU_LISTEN);
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}
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#endif /* INET6 */
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/*
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* Initiate connection to peer.
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* Create a template for use in transmissions on this connection.
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* Enter SYN_SENT state, and mark socket as connecting.
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* Start keep-alive timer, and seed output sequence space.
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* Send initial segment on connection.
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*/
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static int
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tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct proc *p)
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{
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int s = splnet();
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int error = 0;
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struct inpcb *inp = sotoinpcb(so);
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struct tcpcb *tp;
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struct sockaddr_in *sinp;
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COMMON_START();
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/*
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* Must disallow TCP ``connections'' to multicast addresses.
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*/
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sinp = (struct sockaddr_in *)nam;
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if (sinp->sin_family == AF_INET
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&& IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
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error = EAFNOSUPPORT;
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goto out;
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}
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if (p && jailed(p->p_ucred))
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prison_remote_ip(p->p_ucred, 0, &sinp->sin_addr.s_addr);
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if ((error = tcp_connect(tp, nam, p)) != 0)
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goto out;
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error = tcp_output(tp);
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COMMON_END(PRU_CONNECT);
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}
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#ifdef INET6
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static int
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tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct proc *p)
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{
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int s = splnet();
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int error = 0;
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struct inpcb *inp = sotoinpcb(so);
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struct tcpcb *tp;
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struct sockaddr_in6 *sin6p;
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|
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COMMON_START();
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/*
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* Must disallow TCP ``connections'' to multicast addresses.
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*/
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sin6p = (struct sockaddr_in6 *)nam;
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if (sin6p->sin6_family == AF_INET6
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&& IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
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error = EAFNOSUPPORT;
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goto out;
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}
|
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|
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if ((inp->inp_flags & IN6P_BINDV6ONLY) == 0 &&
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IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
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struct sockaddr_in sin;
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in6_sin6_2_sin(&sin, sin6p);
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inp->inp_vflag |= INP_IPV4;
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inp->inp_vflag &= ~INP_IPV6;
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if ((error = tcp_connect(tp, (struct sockaddr *)&sin, p)) != 0)
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goto out;
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error = tcp_output(tp);
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goto out;
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}
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inp->inp_vflag &= ~INP_IPV4;
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inp->inp_vflag |= INP_IPV6;
|
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if ((error = tcp6_connect(tp, nam, p)) != 0)
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goto out;
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error = tcp_output(tp);
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COMMON_END(PRU_CONNECT);
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}
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#endif /* INET6 */
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|
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/*
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* Initiate disconnect from peer.
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* If connection never passed embryonic stage, just drop;
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* else if don't need to let data drain, then can just drop anyways,
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* else have to begin TCP shutdown process: mark socket disconnecting,
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* drain unread data, state switch to reflect user close, and
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* send segment (e.g. FIN) to peer. Socket will be really disconnected
|
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* when peer sends FIN and acks ours.
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*
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* SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
|
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*/
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static int
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tcp_usr_disconnect(struct socket *so)
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{
|
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int s = splnet();
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int error = 0;
|
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struct inpcb *inp = sotoinpcb(so);
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struct tcpcb *tp;
|
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|
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COMMON_START();
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tp = tcp_disconnect(tp);
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COMMON_END(PRU_DISCONNECT);
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}
|
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|
|
/*
|
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* Accept a connection. Essentially all the work is
|
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* done at higher levels; just return the address
|
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* of the peer, storing through addr.
|
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*/
|
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static int
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tcp_usr_accept(struct socket *so, struct sockaddr **nam)
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{
|
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int s = splnet();
|
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int error = 0;
|
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struct inpcb *inp = sotoinpcb(so);
|
|
struct tcpcb *tp = NULL;
|
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TCPDEBUG0;
|
|
|
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if (so->so_state & SS_ISDISCONNECTED) {
|
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error = ECONNABORTED;
|
|
goto out;
|
|
}
|
|
if (inp == 0) {
|
|
splx(s);
|
|
return (EINVAL);
|
|
}
|
|
tp = intotcpcb(inp);
|
|
TCPDEBUG1();
|
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in_setpeeraddr(so, nam);
|
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COMMON_END(PRU_ACCEPT);
|
|
}
|
|
|
|
#ifdef INET6
|
|
static int
|
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tcp6_usr_accept(struct socket *so, struct sockaddr **nam)
|
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{
|
|
int s = splnet();
|
|
int error = 0;
|
|
struct inpcb *inp = sotoinpcb(so);
|
|
struct tcpcb *tp = NULL;
|
|
TCPDEBUG0;
|
|
|
|
if (so->so_state & SS_ISDISCONNECTED) {
|
|
error = ECONNABORTED;
|
|
goto out;
|
|
}
|
|
if (inp == 0) {
|
|
splx(s);
|
|
return (EINVAL);
|
|
}
|
|
tp = intotcpcb(inp);
|
|
TCPDEBUG1();
|
|
in6_mapped_peeraddr(so, nam);
|
|
COMMON_END(PRU_ACCEPT);
|
|
}
|
|
#endif /* INET6 */
|
|
/*
|
|
* Mark the connection as being incapable of further output.
|
|
*/
|
|
static int
|
|
tcp_usr_shutdown(struct socket *so)
|
|
{
|
|
int s = splnet();
|
|
int error = 0;
|
|
struct inpcb *inp = sotoinpcb(so);
|
|
struct tcpcb *tp;
|
|
|
|
COMMON_START();
|
|
socantsendmore(so);
|
|
tp = tcp_usrclosed(tp);
|
|
if (tp)
|
|
error = tcp_output(tp);
|
|
COMMON_END(PRU_SHUTDOWN);
|
|
}
|
|
|
|
/*
|
|
* After a receive, possibly send window update to peer.
|
|
*/
|
|
static int
|
|
tcp_usr_rcvd(struct socket *so, int flags)
|
|
{
|
|
int s = splnet();
|
|
int error = 0;
|
|
struct inpcb *inp = sotoinpcb(so);
|
|
struct tcpcb *tp;
|
|
|
|
COMMON_START();
|
|
tcp_output(tp);
|
|
COMMON_END(PRU_RCVD);
|
|
}
|
|
|
|
/*
|
|
* 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 proc *p)
|
|
{
|
|
int s = splnet();
|
|
int error = 0;
|
|
struct inpcb *inp = sotoinpcb(so);
|
|
struct tcpcb *tp;
|
|
#ifdef INET6
|
|
int isipv6;
|
|
#endif
|
|
TCPDEBUG0;
|
|
|
|
if (inp == NULL) {
|
|
/*
|
|
* OOPS! we lost a race, the TCP session got reset after
|
|
* we checked SS_CANTSENDMORE, eg: while doing uiomove or a
|
|
* network interrupt in the non-splnet() section of sosend().
|
|
*/
|
|
if (m)
|
|
m_freem(m);
|
|
if (control)
|
|
m_freem(control);
|
|
error = ECONNRESET; /* XXX EPIPE? */
|
|
tp = NULL;
|
|
TCPDEBUG1();
|
|
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)) {
|
|
sbappend(&so->so_snd, m);
|
|
if (nam && tp->t_state < TCPS_SYN_SENT) {
|
|
/*
|
|
* Do implied connect if not yet connected,
|
|
* initialize window to default value, and
|
|
* initialize maxseg/maxopd using peer's cached
|
|
* MSS.
|
|
*/
|
|
#ifdef INET6
|
|
if (isipv6)
|
|
error = tcp6_connect(tp, nam, p);
|
|
else
|
|
#endif /* INET6 */
|
|
error = tcp_connect(tp, nam, p);
|
|
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.
|
|
*/
|
|
socantsendmore(so);
|
|
tp = tcp_usrclosed(tp);
|
|
}
|
|
if (tp != NULL) {
|
|
if (flags & PRUS_MORETOCOME)
|
|
tp->t_flags |= TF_MORETOCOME;
|
|
error = tcp_output(tp);
|
|
if (flags & PRUS_MORETOCOME)
|
|
tp->t_flags &= ~TF_MORETOCOME;
|
|
}
|
|
} else {
|
|
if (sbspace(&so->so_snd) < -512) {
|
|
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.
|
|
*/
|
|
sbappend(&so->so_snd, m);
|
|
if (nam && tp->t_state < TCPS_SYN_SENT) {
|
|
/*
|
|
* Do implied connect if not yet connected,
|
|
* initialize window to default value, and
|
|
* initialize maxseg/maxopd using peer's cached
|
|
* MSS.
|
|
*/
|
|
#ifdef INET6
|
|
if (isipv6)
|
|
error = tcp6_connect(tp, nam, p);
|
|
else
|
|
#endif /* INET6 */
|
|
error = tcp_connect(tp, nam, p);
|
|
if (error)
|
|
goto out;
|
|
tp->snd_wnd = TTCP_CLIENT_SND_WND;
|
|
tcp_mss(tp, -1);
|
|
}
|
|
tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
|
|
tp->t_force = 1;
|
|
error = tcp_output(tp);
|
|
tp->t_force = 0;
|
|
}
|
|
COMMON_END((flags & PRUS_OOB) ? PRU_SENDOOB :
|
|
((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
|
|
}
|
|
|
|
/*
|
|
* Abort the TCP.
|
|
*/
|
|
static int
|
|
tcp_usr_abort(struct socket *so)
|
|
{
|
|
int s = splnet();
|
|
int error = 0;
|
|
struct inpcb *inp = sotoinpcb(so);
|
|
struct tcpcb *tp;
|
|
|
|
COMMON_START();
|
|
tp = tcp_drop(tp, ECONNABORTED);
|
|
COMMON_END(PRU_ABORT);
|
|
}
|
|
|
|
/*
|
|
* Receive out-of-band data.
|
|
*/
|
|
static int
|
|
tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags)
|
|
{
|
|
int s = splnet();
|
|
int error = 0;
|
|
struct inpcb *inp = sotoinpcb(so);
|
|
struct tcpcb *tp;
|
|
|
|
COMMON_START();
|
|
if ((so->so_oobmark == 0 &&
|
|
(so->so_state & SS_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);
|
|
COMMON_END(PRU_RCVOOB);
|
|
}
|
|
|
|
/* xxx - should be const */
|
|
struct pr_usrreqs tcp_usrreqs = {
|
|
tcp_usr_abort, tcp_usr_accept, tcp_usr_attach, tcp_usr_bind,
|
|
tcp_usr_connect, pru_connect2_notsupp, in_control, tcp_usr_detach,
|
|
tcp_usr_disconnect, tcp_usr_listen, in_setpeeraddr, tcp_usr_rcvd,
|
|
tcp_usr_rcvoob, tcp_usr_send, pru_sense_null, tcp_usr_shutdown,
|
|
in_setsockaddr, sosend, soreceive, sopoll
|
|
};
|
|
|
|
#ifdef INET6
|
|
struct pr_usrreqs tcp6_usrreqs = {
|
|
tcp_usr_abort, tcp6_usr_accept, tcp_usr_attach, tcp6_usr_bind,
|
|
tcp6_usr_connect, pru_connect2_notsupp, in6_control, tcp_usr_detach,
|
|
tcp_usr_disconnect, tcp6_usr_listen, in6_mapped_peeraddr, tcp_usr_rcvd,
|
|
tcp_usr_rcvoob, tcp_usr_send, pru_sense_null, tcp_usr_shutdown,
|
|
in6_mapped_sockaddr, sosend, soreceive, sopoll
|
|
};
|
|
#endif /* INET6 */
|
|
|
|
/*
|
|
* 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_pcbladdr 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(tp, nam, p)
|
|
register struct tcpcb *tp;
|
|
struct sockaddr *nam;
|
|
struct proc *p;
|
|
{
|
|
struct inpcb *inp = tp->t_inpcb, *oinp;
|
|
struct socket *so = inp->inp_socket;
|
|
struct tcpcb *otp;
|
|
struct sockaddr_in *sin = (struct sockaddr_in *)nam;
|
|
struct sockaddr_in *ifaddr;
|
|
struct rmxp_tao *taop;
|
|
struct rmxp_tao tao_noncached;
|
|
int error;
|
|
|
|
if (inp->inp_lport == 0) {
|
|
error = in_pcbbind(inp, (struct sockaddr *)0, p);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
error = in_pcbladdr(inp, nam, &ifaddr);
|
|
if (error)
|
|
return error;
|
|
oinp = in_pcblookup_hash(inp->inp_pcbinfo,
|
|
sin->sin_addr, sin->sin_port,
|
|
inp->inp_laddr.s_addr != INADDR_ANY ? inp->inp_laddr
|
|
: ifaddr->sin_addr,
|
|
inp->inp_lport, 0, NULL);
|
|
if (oinp) {
|
|
if (oinp != inp && (otp = intotcpcb(oinp)) != NULL &&
|
|
otp->t_state == TCPS_TIME_WAIT &&
|
|
(ticks - otp->t_starttime) < tcp_msl &&
|
|
(otp->t_flags & TF_RCVD_CC))
|
|
otp = tcp_close(otp);
|
|
else
|
|
return EADDRINUSE;
|
|
}
|
|
if (inp->inp_laddr.s_addr == INADDR_ANY)
|
|
inp->inp_laddr = ifaddr->sin_addr;
|
|
inp->inp_faddr = sin->sin_addr;
|
|
inp->inp_fport = sin->sin_port;
|
|
in_pcbrehash(inp);
|
|
|
|
tp->t_template = tcp_template(tp);
|
|
if (tp->t_template == 0) {
|
|
in_pcbdisconnect(inp);
|
|
return ENOBUFS;
|
|
}
|
|
|
|
/* Compute window scaling to request. */
|
|
while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
|
|
(TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
|
|
tp->request_r_scale++;
|
|
|
|
soisconnecting(so);
|
|
tcpstat.tcps_connattempt++;
|
|
tp->t_state = TCPS_SYN_SENT;
|
|
callout_reset(tp->tt_keep, tcp_keepinit, tcp_timer_keep, tp);
|
|
tp->iss = tcp_iss; tcp_iss += TCP_ISSINCR/2;
|
|
tcp_sendseqinit(tp);
|
|
|
|
/*
|
|
* Generate a CC value for this connection and
|
|
* check whether CC or CCnew should be used.
|
|
*/
|
|
if ((taop = tcp_gettaocache(tp->t_inpcb)) == NULL) {
|
|
taop = &tao_noncached;
|
|
bzero(taop, sizeof(*taop));
|
|
}
|
|
|
|
tp->cc_send = CC_INC(tcp_ccgen);
|
|
if (taop->tao_ccsent != 0 &&
|
|
CC_GEQ(tp->cc_send, taop->tao_ccsent)) {
|
|
taop->tao_ccsent = tp->cc_send;
|
|
} else {
|
|
taop->tao_ccsent = 0;
|
|
tp->t_flags |= TF_SENDCCNEW;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef INET6
|
|
static int
|
|
tcp6_connect(tp, nam, p)
|
|
register struct tcpcb *tp;
|
|
struct sockaddr *nam;
|
|
struct proc *p;
|
|
{
|
|
struct inpcb *inp = tp->t_inpcb, *oinp;
|
|
struct socket *so = inp->inp_socket;
|
|
struct tcpcb *otp;
|
|
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
|
|
struct in6_addr *addr6;
|
|
struct rmxp_tao *taop;
|
|
struct rmxp_tao tao_noncached;
|
|
int error;
|
|
|
|
if (inp->inp_lport == 0) {
|
|
error = in6_pcbbind(inp, (struct sockaddr *)0, p);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
error = in6_pcbladdr(inp, nam, &addr6);
|
|
if (error)
|
|
return error;
|
|
oinp = in6_pcblookup_hash(inp->inp_pcbinfo,
|
|
&sin6->sin6_addr, sin6->sin6_port,
|
|
IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
|
|
? addr6
|
|
: &inp->in6p_laddr,
|
|
inp->inp_lport, 0, NULL);
|
|
if (oinp) {
|
|
if (oinp != inp && (otp = intotcpcb(oinp)) != NULL &&
|
|
otp->t_state == TCPS_TIME_WAIT &&
|
|
(ticks - otp->t_starttime) < tcp_msl &&
|
|
(otp->t_flags & TF_RCVD_CC))
|
|
otp = tcp_close(otp);
|
|
else
|
|
return EADDRINUSE;
|
|
}
|
|
if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
|
|
inp->in6p_laddr = *addr6;
|
|
inp->in6p_faddr = sin6->sin6_addr;
|
|
inp->inp_fport = sin6->sin6_port;
|
|
if ((sin6->sin6_flowinfo & IPV6_FLOWINFO_MASK) != NULL)
|
|
inp->in6p_flowinfo = sin6->sin6_flowinfo;
|
|
in_pcbrehash(inp);
|
|
|
|
tp->t_template = tcp_template(tp);
|
|
if (tp->t_template == 0) {
|
|
in6_pcbdisconnect(inp);
|
|
return ENOBUFS;
|
|
}
|
|
|
|
/* Compute window scaling to request. */
|
|
while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
|
|
(TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
|
|
tp->request_r_scale++;
|
|
|
|
soisconnecting(so);
|
|
tcpstat.tcps_connattempt++;
|
|
tp->t_state = TCPS_SYN_SENT;
|
|
callout_reset(tp->tt_keep, tcp_keepinit, tcp_timer_keep, tp);
|
|
tp->iss = tcp_iss; tcp_iss += TCP_ISSINCR/2;
|
|
tcp_sendseqinit(tp);
|
|
|
|
/*
|
|
* Generate a CC value for this connection and
|
|
* check whether CC or CCnew should be used.
|
|
*/
|
|
if ((taop = tcp_gettaocache(tp->t_inpcb)) == NULL) {
|
|
taop = &tao_noncached;
|
|
bzero(taop, sizeof(*taop));
|
|
}
|
|
|
|
tp->cc_send = CC_INC(tcp_ccgen);
|
|
if (taop->tao_ccsent != 0 &&
|
|
CC_GEQ(tp->cc_send, taop->tao_ccsent)) {
|
|
taop->tao_ccsent = tp->cc_send;
|
|
} else {
|
|
taop->tao_ccsent = 0;
|
|
tp->t_flags |= TF_SENDCCNEW;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif /* INET6 */
|
|
|
|
/*
|
|
* The new sockopt interface makes it possible for us to block in the
|
|
* copyin/out step (if we take a page fault). Taking a page fault at
|
|
* splnet() is probably a Bad Thing. (Since sockets and pcbs both now
|
|
* use TSM, there probably isn't any need for this function to run at
|
|
* splnet() any more. This needs more examination.)
|
|
*/
|
|
int
|
|
tcp_ctloutput(so, sopt)
|
|
struct socket *so;
|
|
struct sockopt *sopt;
|
|
{
|
|
int error, opt, optval, s;
|
|
struct inpcb *inp;
|
|
struct tcpcb *tp;
|
|
|
|
error = 0;
|
|
s = splnet(); /* XXX */
|
|
inp = sotoinpcb(so);
|
|
if (inp == NULL) {
|
|
splx(s);
|
|
return (ECONNRESET);
|
|
}
|
|
if (sopt->sopt_level != IPPROTO_TCP) {
|
|
#ifdef INET6
|
|
if (INP_CHECK_SOCKAF(so, AF_INET6))
|
|
error = ip6_ctloutput(so, sopt);
|
|
else
|
|
#endif /* INET6 */
|
|
error = ip_ctloutput(so, sopt);
|
|
splx(s);
|
|
return (error);
|
|
}
|
|
tp = intotcpcb(inp);
|
|
|
|
switch (sopt->sopt_dir) {
|
|
case SOPT_SET:
|
|
switch (sopt->sopt_name) {
|
|
case TCP_NODELAY:
|
|
case TCP_NOOPT:
|
|
error = sooptcopyin(sopt, &optval, sizeof optval,
|
|
sizeof optval);
|
|
if (error)
|
|
break;
|
|
|
|
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;
|
|
break;
|
|
|
|
case TCP_NOPUSH:
|
|
error = sooptcopyin(sopt, &optval, sizeof optval,
|
|
sizeof optval);
|
|
if (error)
|
|
break;
|
|
|
|
if (optval)
|
|
tp->t_flags |= TF_NOPUSH;
|
|
else {
|
|
tp->t_flags &= ~TF_NOPUSH;
|
|
error = tcp_output(tp);
|
|
}
|
|
break;
|
|
|
|
case TCP_MAXSEG:
|
|
error = sooptcopyin(sopt, &optval, sizeof optval,
|
|
sizeof optval);
|
|
if (error)
|
|
break;
|
|
|
|
if (optval > 0 && optval <= tp->t_maxseg)
|
|
tp->t_maxseg = optval;
|
|
else
|
|
error = EINVAL;
|
|
break;
|
|
|
|
default:
|
|
error = ENOPROTOOPT;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case SOPT_GET:
|
|
switch (sopt->sopt_name) {
|
|
case TCP_NODELAY:
|
|
optval = tp->t_flags & TF_NODELAY;
|
|
break;
|
|
case TCP_MAXSEG:
|
|
optval = tp->t_maxseg;
|
|
break;
|
|
case TCP_NOOPT:
|
|
optval = tp->t_flags & TF_NOOPT;
|
|
break;
|
|
case TCP_NOPUSH:
|
|
optval = tp->t_flags & TF_NOPUSH;
|
|
break;
|
|
default:
|
|
error = ENOPROTOOPT;
|
|
break;
|
|
}
|
|
if (error == 0)
|
|
error = sooptcopyout(sopt, &optval, sizeof optval);
|
|
break;
|
|
}
|
|
splx(s);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* tcp_sendspace and tcp_recvspace are the default send and receive window
|
|
* sizes, respectively. These are obsolescent (this information should
|
|
* be set by the route).
|
|
*/
|
|
u_long tcp_sendspace = 1024*16;
|
|
SYSCTL_INT(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW,
|
|
&tcp_sendspace , 0, "Maximum outgoing TCP datagram size");
|
|
u_long tcp_recvspace = 1024*16;
|
|
SYSCTL_INT(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
|
|
&tcp_recvspace , 0, "Maximum incoming TCP datagram size");
|
|
|
|
/*
|
|
* 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(so, p)
|
|
struct socket *so;
|
|
struct proc *p;
|
|
{
|
|
register struct tcpcb *tp;
|
|
struct inpcb *inp;
|
|
int error;
|
|
#ifdef INET6
|
|
int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != NULL;
|
|
#endif
|
|
|
|
if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
|
|
error = soreserve(so, tcp_sendspace, tcp_recvspace);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
error = in_pcballoc(so, &tcbinfo, p);
|
|
if (error)
|
|
return (error);
|
|
inp = sotoinpcb(so);
|
|
#ifdef IPSEC
|
|
error = ipsec_init_policy(so, &inp->inp_sp);
|
|
if (error) {
|
|
#ifdef INET6
|
|
if (isipv6)
|
|
in6_pcbdetach(inp);
|
|
else
|
|
#endif
|
|
in_pcbdetach(inp);
|
|
return (error);
|
|
}
|
|
#endif /*IPSEC*/
|
|
#ifdef INET6
|
|
if (isipv6) {
|
|
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 == 0) {
|
|
int nofd = so->so_state & SS_NOFDREF; /* XXX */
|
|
|
|
so->so_state &= ~SS_NOFDREF; /* don't free the socket yet */
|
|
#ifdef INET6
|
|
if (isipv6)
|
|
in6_pcbdetach(inp);
|
|
else
|
|
#endif
|
|
in_pcbdetach(inp);
|
|
so->so_state |= nofd;
|
|
return (ENOBUFS);
|
|
}
|
|
tp->t_state = TCPS_CLOSED;
|
|
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 struct tcpcb *
|
|
tcp_disconnect(tp)
|
|
register struct tcpcb *tp;
|
|
{
|
|
struct socket *so = tp->t_inpcb->inp_socket;
|
|
|
|
if (tp->t_state < TCPS_ESTABLISHED)
|
|
tp = tcp_close(tp);
|
|
else if ((so->so_options & SO_LINGER) && so->so_linger == 0)
|
|
tp = tcp_drop(tp, 0);
|
|
else {
|
|
soisdisconnecting(so);
|
|
sbflush(&so->so_rcv);
|
|
tp = tcp_usrclosed(tp);
|
|
if (tp)
|
|
(void) tcp_output(tp);
|
|
}
|
|
return (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 struct tcpcb *
|
|
tcp_usrclosed(tp)
|
|
register struct tcpcb *tp;
|
|
{
|
|
|
|
switch (tp->t_state) {
|
|
|
|
case TCPS_CLOSED:
|
|
case TCPS_LISTEN:
|
|
tp->t_state = TCPS_CLOSED;
|
|
tp = tcp_close(tp);
|
|
break;
|
|
|
|
case TCPS_SYN_SENT:
|
|
case TCPS_SYN_RECEIVED:
|
|
tp->t_flags |= TF_NEEDFIN;
|
|
break;
|
|
|
|
case TCPS_ESTABLISHED:
|
|
tp->t_state = TCPS_FIN_WAIT_1;
|
|
break;
|
|
|
|
case TCPS_CLOSE_WAIT:
|
|
tp->t_state = TCPS_LAST_ACK;
|
|
break;
|
|
}
|
|
if (tp && tp->t_state >= TCPS_FIN_WAIT_2) {
|
|
soisdisconnected(tp->t_inpcb->inp_socket);
|
|
/* To prevent the connection hanging in FIN_WAIT_2 forever. */
|
|
if (tp->t_state == TCPS_FIN_WAIT_2)
|
|
callout_reset(tp->tt_2msl, tcp_maxidle,
|
|
tcp_timer_2msl, tp);
|
|
}
|
|
return (tp);
|
|
}
|
|
|