/
tcp_usrreq.c
2337 lines (2075 loc) · 62.6 KB
/
tcp_usrreq.c
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/* $NetBSD: tcp_usrreq.c,v 1.234 2022/10/28 05:25:36 ozaki-r Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project 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 PROJECT 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 PROJECT 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.
*/
/*-
* Copyright (c) 1997, 1998, 2005, 2006 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe and Kevin M. Lahey of the Numerical Aerospace Simulation
* Facility, NASA Ames Research Center.
* This code is derived from software contributed to The NetBSD Foundation
* by Charles M. Hannum.
* This code is derived from software contributed to The NetBSD Foundation
* by Rui Paulo.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*
* Copyright (c) 1982, 1986, 1988, 1993, 1995
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)tcp_usrreq.c 8.5 (Berkeley) 6/21/95
*/
/*
* TCP protocol interface to socket abstraction.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: tcp_usrreq.c,v 1.234 2022/10/28 05:25:36 ozaki-r Exp $");
#ifdef _KERNEL_OPT
#include "opt_inet.h"
#include "opt_tcp_debug.h"
#include "opt_mbuftrace.h"
#include "opt_tcp_space.h"
#include "opt_net_mpsafe.h"
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/protosw.h>
#include <sys/errno.h>
#include <sys/stat.h>
#include <sys/proc.h>
#include <sys/domain.h>
#include <sys/sysctl.h>
#include <sys/kauth.h>
#include <sys/kernel.h>
#include <sys/uidinfo.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>
#include <netinet/ip_var.h>
#include <netinet/in_offload.h>
#ifdef INET6
#include <netinet/ip6.h>
#include <netinet6/in6_pcb.h>
#include <netinet6/ip6_var.h>
#include <netinet6/scope6_var.h>
#endif
#include <netinet/tcp.h>
#include <netinet/tcp_fsm.h>
#include <netinet/tcp_seq.h>
#include <netinet/tcp_timer.h>
#include <netinet/tcp_var.h>
#include <netinet/tcp_private.h>
#include <netinet/tcp_congctl.h>
#include <netinet/tcp_debug.h>
#include <netinet/tcp_vtw.h>
#include <netinet/tcp_syncache.h>
static int
tcp_debug_capture(struct tcpcb *tp, int req)
{
#ifdef TCP_DEBUG
return tp->t_state;
#endif
return 0;
}
static inline void
tcp_debug_trace(struct socket *so, struct tcpcb *tp, int ostate, int req)
{
#ifdef TCP_DEBUG
if (tp && (so->so_options & SO_DEBUG))
tcp_trace(TA_USER, ostate, tp, NULL, req);
#endif
}
static void
change_keepalive(struct socket *so, struct tcpcb *tp)
{
tp->t_maxidle = tp->t_keepcnt * MIN(tp->t_keepintvl,
TCP_TIMER_MAXTICKS / tp->t_keepcnt);
TCP_TIMER_DISARM(tp, TCPT_KEEP);
TCP_TIMER_DISARM(tp, TCPT_2MSL);
if (tp->t_state == TCPS_SYN_RECEIVED ||
tp->t_state == TCPS_SYN_SENT) {
TCP_TIMER_ARM(tp, TCPT_KEEP, tp->t_keepinit);
} else if (so->so_options & SO_KEEPALIVE &&
tp->t_state <= TCPS_CLOSE_WAIT) {
TCP_TIMER_ARM(tp, TCPT_KEEP, tp->t_keepintvl);
} else {
TCP_TIMER_ARM(tp, TCPT_KEEP, tp->t_keepidle);
}
if ((tp->t_state == TCPS_FIN_WAIT_2) && (tp->t_maxidle > 0))
TCP_TIMER_ARM(tp, TCPT_2MSL, tp->t_maxidle);
}
/*
* 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)
{
bzero(ti, sizeof(*ti));
ti->tcpi_state = tp->t_state;
if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP))
ti->tcpi_options |= TCPI_OPT_TIMESTAMPS;
if (tp->t_flags & TF_SACK_PERMIT)
ti->tcpi_options |= TCPI_OPT_SACK;
if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) {
ti->tcpi_options |= TCPI_OPT_WSCALE;
ti->tcpi_snd_wscale = tp->snd_scale;
ti->tcpi_rcv_wscale = tp->rcv_scale;
}
if (tp->t_flags & TF_ECN_PERMIT) {
ti->tcpi_options |= TCPI_OPT_ECN;
}
ti->tcpi_rto = tp->t_rxtcur * tick;
ti->tcpi_last_data_recv = (long)(getticks() -
(int)tp->t_rcvtime) * tick;
ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick / PR_SLOWHZ)
>> (TCP_RTT_SHIFT + 2);
ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick / PR_SLOWHZ)
>> (TCP_RTTVAR_SHIFT + 2);
ti->tcpi_snd_ssthresh = tp->snd_ssthresh;
/* Linux API wants these in # of segments, apparently */
ti->tcpi_snd_cwnd = tp->snd_cwnd / tp->t_segsz;
ti->tcpi_snd_wnd = tp->snd_wnd / tp->t_segsz;
/*
* FreeBSD-specific extension fields for tcp_info.
*/
ti->tcpi_rcv_space = tp->rcv_wnd;
ti->tcpi_rcv_nxt = tp->rcv_nxt;
ti->tcpi_snd_bwnd = 0; /* Unused, kept for compat. */
ti->tcpi_snd_nxt = tp->snd_nxt;
ti->tcpi_snd_mss = tp->t_segsz;
ti->tcpi_rcv_mss = tp->t_segsz;
#ifdef TF_TOE
if (tp->t_flags & TF_TOE)
ti->tcpi_options |= TCPI_OPT_TOE;
#endif
/* From the redundant department of redundancies... */
ti->__tcpi_retransmits = ti->__tcpi_retrans =
ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack;
ti->tcpi_rcv_ooopack = tp->t_rcvoopack;
ti->tcpi_snd_zerowin = tp->t_sndzerowin;
}
int
tcp_ctloutput(int op, struct socket *so, struct sockopt *sopt)
{
int error = 0, s;
struct inpcb *inp;
struct tcpcb *tp;
struct tcp_info ti;
u_int ui;
int family; /* family of the socket */
int level, optname, optval;
level = sopt->sopt_level;
optname = sopt->sopt_name;
family = so->so_proto->pr_domain->dom_family;
s = splsoftnet();
inp = sotoinpcb(so);
if (level != IPPROTO_TCP) {
switch (family) {
case PF_INET:
error = ip_ctloutput(op, so, sopt);
break;
#ifdef INET6
case PF_INET6:
error = ip6_ctloutput(op, so, sopt);
break;
#endif
}
splx(s);
return error;
}
tp = intotcpcb(inp);
switch (op) {
case PRCO_SETOPT:
switch (optname) {
#ifdef TCP_SIGNATURE
case TCP_MD5SIG:
error = sockopt_getint(sopt, &optval);
if (error)
break;
if (optval > 0)
tp->t_flags |= TF_SIGNATURE;
else
tp->t_flags &= ~TF_SIGNATURE;
break;
#endif /* TCP_SIGNATURE */
case TCP_NODELAY:
error = sockopt_getint(sopt, &optval);
if (error)
break;
if (optval)
tp->t_flags |= TF_NODELAY;
else
tp->t_flags &= ~TF_NODELAY;
break;
case TCP_MAXSEG:
error = sockopt_getint(sopt, &optval);
if (error)
break;
if (optval > 0 && optval <= tp->t_peermss)
tp->t_peermss = optval; /* limit on send size */
else
error = EINVAL;
break;
#ifdef notyet
case TCP_CONGCTL:
/* XXX string overflow XXX */
error = tcp_congctl_select(tp, sopt->sopt_data);
break;
#endif
case TCP_KEEPIDLE:
error = sockopt_get(sopt, &ui, sizeof(ui));
if (error)
break;
if (ui > 0 && ui <= TCP_TIMER_MAXTICKS) {
tp->t_keepidle = ui;
change_keepalive(so, tp);
} else
error = EINVAL;
break;
case TCP_KEEPINTVL:
error = sockopt_get(sopt, &ui, sizeof(ui));
if (error)
break;
if (ui > 0 && ui <= TCP_TIMER_MAXTICKS) {
tp->t_keepintvl = ui;
change_keepalive(so, tp);
} else
error = EINVAL;
break;
case TCP_KEEPCNT:
error = sockopt_get(sopt, &ui, sizeof(ui));
if (error)
break;
if (ui > 0 && ui <= TCP_TIMER_MAXTICKS) {
tp->t_keepcnt = ui;
change_keepalive(so, tp);
} else
error = EINVAL;
break;
case TCP_KEEPINIT:
error = sockopt_get(sopt, &ui, sizeof(ui));
if (error)
break;
if (ui > 0 && ui <= TCP_TIMER_MAXTICKS) {
tp->t_keepinit = ui;
change_keepalive(so, tp);
} else
error = EINVAL;
break;
default:
error = ENOPROTOOPT;
break;
}
break;
case PRCO_GETOPT:
switch (optname) {
#ifdef TCP_SIGNATURE
case TCP_MD5SIG:
optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0;
goto setval;
#endif
case TCP_NODELAY:
optval = tp->t_flags & TF_NODELAY;
goto setval;
case TCP_MAXSEG:
optval = tp->t_peermss;
goto setval;
case TCP_INFO:
tcp_fill_info(tp, &ti);
error = sockopt_set(sopt, &ti, sizeof ti);
break;
#ifdef notyet
case TCP_CONGCTL:
break;
#endif
case TCP_KEEPIDLE:
optval = tp->t_keepidle;
goto setval;
case TCP_KEEPINTVL:
optval = tp->t_keepintvl;
goto setval;
case TCP_KEEPCNT:
optval = tp->t_keepcnt;
goto setval;
case TCP_KEEPINIT:
optval = tp->t_keepinit;
setval: error = sockopt_set(sopt, &optval, sizeof(optval));
break;
default:
error = ENOPROTOOPT;
break;
}
break;
}
splx(s);
return error;
}
#ifndef TCP_SENDSPACE
#define TCP_SENDSPACE 1024*32
#endif
int tcp_sendspace = TCP_SENDSPACE;
#ifndef TCP_RECVSPACE
#define TCP_RECVSPACE 1024*32
#endif
int tcp_recvspace = TCP_RECVSPACE;
/*
* tcp_attach: attach TCP protocol to socket, allocating internet protocol
* control block, TCP control block, buffer space and entering LISTEN state
* if to accept connections.
*/
static int
tcp_attach(struct socket *so, int proto)
{
struct tcpcb *tp;
struct inpcb *inp;
int s, error, family;
/* Assign the lock (must happen even if we will error out). */
s = splsoftnet();
sosetlock(so);
KASSERT(solocked(so));
KASSERT(sotoinpcb(so) == NULL);
inp = sotoinpcb(so);
KASSERT(inp == NULL);
family = soaf(so);
#ifdef MBUFTRACE
so->so_mowner = &tcp_sock_mowner;
so->so_rcv.sb_mowner = &tcp_sock_rx_mowner;
so->so_snd.sb_mowner = &tcp_sock_tx_mowner;
#endif
if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
error = soreserve(so, tcp_sendspace, tcp_recvspace);
if (error)
goto out;
}
so->so_rcv.sb_flags |= SB_AUTOSIZE;
so->so_snd.sb_flags |= SB_AUTOSIZE;
error = in_pcballoc(so, &tcbtable);
if (error)
goto out;
inp = sotoinpcb(so);
tp = tcp_newtcpcb(family, inp);
if (tp == NULL) {
int nofd = so->so_state & SS_NOFDREF; /* XXX */
so->so_state &= ~SS_NOFDREF; /* don't free the socket yet */
in_pcbdetach(inp);
so->so_state |= nofd;
error = ENOBUFS;
goto out;
}
tp->t_state = TCPS_CLOSED;
if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
so->so_linger = TCP_LINGERTIME;
}
out:
KASSERT(solocked(so));
splx(s);
return error;
}
static void
tcp_detach(struct socket *so)
{
struct inpcb *inp;
struct tcpcb *tp;
int s;
inp = sotoinpcb(so);
tp = intotcpcb(inp);
s = splsoftnet();
(void)tcp_disconnect1(tp);
splx(s);
}
static int
tcp_accept(struct socket *so, struct sockaddr *nam)
{
struct inpcb *inp;
struct tcpcb *tp;
int ostate = 0;
int s;
inp = sotoinpcb(so);
tp = intotcpcb(inp);
ostate = tcp_debug_capture(tp, PRU_ACCEPT);
/*
* Accept a connection. Essentially all the work is
* done at higher levels; just return the address
* of the peer, storing through addr.
*/
s = splsoftnet();
if (inp->inp_af == AF_INET) {
in_setpeeraddr(inp, (struct sockaddr_in *)nam);
}
#ifdef INET6
else if (inp->inp_af == AF_INET6) {
in6_setpeeraddr(inp, (struct sockaddr_in6 *)nam);
}
#endif
tcp_debug_trace(so, tp, ostate, PRU_ACCEPT);
splx(s);
return 0;
}
static int
tcp_bind(struct socket *so, struct sockaddr *nam, struct lwp *l)
{
struct inpcb *inp = NULL;
struct sockaddr_in *sin = (struct sockaddr_in *)nam;
#ifdef INET6
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
#endif /* INET6 */
struct tcpcb *tp;
int s;
int error = 0;
int ostate = 0;
inp = sotoinpcb(so);
tp = intotcpcb(inp);
ostate = tcp_debug_capture(tp, PRU_BIND);
/*
* Give the socket an address.
*/
s = splsoftnet();
switch (so->so_proto->pr_domain->dom_family) {
case PF_INET:
error = in_pcbbind(inp, sin, l);
break;
#ifdef INET6
case PF_INET6:
error = in6_pcbbind(inp, sin6, l);
if (!error) {
/* mapped addr case */
if (IN6_IS_ADDR_V4MAPPED(&in6p_laddr(inp)))
tp->t_family = AF_INET;
else
tp->t_family = AF_INET6;
}
break;
#endif
}
tcp_debug_trace(so, tp, ostate, PRU_BIND);
splx(s);
return error;
}
static int
tcp_listen(struct socket *so, struct lwp *l)
{
struct inpcb *inp;
struct tcpcb *tp;
int error = 0;
int ostate = 0;
int s;
inp = sotoinpcb(so);
tp = intotcpcb(inp);
ostate = tcp_debug_capture(tp, PRU_LISTEN);
/*
* Prepare to accept connections.
*/
s = splsoftnet();
if (inp->inp_af == AF_INET && inp->inp_lport == 0) {
error = in_pcbbind(inp, NULL, l);
if (error)
goto release;
}
#ifdef INET6
if (inp->inp_af == AF_INET6 && inp->inp_lport == 0) {
error = in6_pcbbind(inp, NULL, l);
if (error)
goto release;
}
#endif
tp->t_state = TCPS_LISTEN;
release:
tcp_debug_trace(so, tp, ostate, PRU_LISTEN);
splx(s);
return error;
}
static int
tcp_connect(struct socket *so, struct sockaddr *nam, struct lwp *l)
{
struct inpcb *inp;
struct tcpcb *tp;
int s;
int error = 0;
int ostate = 0;
inp = sotoinpcb(so);
tp = intotcpcb(inp);
ostate = tcp_debug_capture(tp, PRU_CONNECT);
/*
* 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.
*/
s = splsoftnet();
if (inp->inp_af == AF_INET) {
if (inp->inp_lport == 0) {
error = in_pcbbind(inp, NULL, l);
if (error)
goto release;
}
error = in_pcbconnect(inp, (struct sockaddr_in *)nam, l);
}
#ifdef INET6
if (inp->inp_af == AF_INET6) {
if (inp->inp_lport == 0) {
error = in6_pcbbind(inp, NULL, l);
if (error)
goto release;
}
error = in6_pcbconnect(inp, (struct sockaddr_in6 *)nam, l);
if (!error) {
/* mapped addr case */
if (IN6_IS_ADDR_V4MAPPED(&in6p_faddr(inp)))
tp->t_family = AF_INET;
else
tp->t_family = AF_INET6;
}
}
#endif
if (error)
goto release;
tp->t_template = tcp_template(tp);
if (tp->t_template == 0) {
if (inp->inp_af == AF_INET)
in_pcbdisconnect(inp);
#ifdef INET6
else if (inp->inp_af == AF_INET6)
in6_pcbdisconnect(inp);
#endif
error = ENOBUFS;
goto release;
}
/*
* Compute window scaling to request.
* XXX: This should be moved 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);
TCP_STATINC(TCP_STAT_CONNATTEMPT);
tp->t_state = TCPS_SYN_SENT;
TCP_TIMER_ARM(tp, TCPT_KEEP, tp->t_keepinit);
tp->iss = tcp_new_iss(tp);
tcp_sendseqinit(tp);
error = tcp_output(tp);
release:
tcp_debug_trace(so, tp, ostate, PRU_CONNECT);
splx(s);
return error;
}
static int
tcp_connect2(struct socket *so, struct socket *so2)
{
struct inpcb *inp;
struct tcpcb *tp;
int ostate = 0;
KASSERT(solocked(so));
inp = sotoinpcb(so);
tp = intotcpcb(inp);
ostate = tcp_debug_capture(tp, PRU_CONNECT2);
tcp_debug_trace(so, tp, ostate, PRU_CONNECT2);
return EOPNOTSUPP;
}
static int
tcp_disconnect(struct socket *so)
{
struct inpcb *inp;
struct tcpcb *tp;
int error = 0;
int ostate = 0;
int s;
inp = sotoinpcb(so);
tp = intotcpcb(inp);
ostate = tcp_debug_capture(tp, PRU_DISCONNECT);
/*
* 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.
*/
s = splsoftnet();
tp = tcp_disconnect1(tp);
tcp_debug_trace(so, tp, ostate, PRU_DISCONNECT);
splx(s);
return error;
}
static int
tcp_shutdown(struct socket *so)
{
struct inpcb *inp;
struct tcpcb *tp;
int error = 0;
int ostate = 0;
int s;
inp = sotoinpcb(so);
tp = intotcpcb(inp);
ostate = tcp_debug_capture(tp, PRU_SHUTDOWN);
/*
* Mark the connection as being incapable of further output.
*/
s = splsoftnet();
socantsendmore(so);
tp = tcp_usrclosed(tp);
if (tp)
error = tcp_output(tp);
tcp_debug_trace(so, tp, ostate, PRU_SHUTDOWN);
splx(s);
return error;
}
static int
tcp_abort(struct socket *so)
{
struct inpcb *inp;
struct tcpcb *tp;
int error = 0;
int ostate = 0;
int s;
inp = sotoinpcb(so);
tp = intotcpcb(inp);
ostate = tcp_debug_capture(tp, PRU_ABORT);
/*
* Abort the TCP.
*/
s = splsoftnet();
tp = tcp_drop(tp, ECONNABORTED);
tcp_debug_trace(so, tp, ostate, PRU_ABORT);
splx(s);
return error;
}
static int
tcp_ioctl(struct socket *so, u_long cmd, void *nam, struct ifnet *ifp)
{
switch (so->so_proto->pr_domain->dom_family) {
case PF_INET:
return in_control(so, cmd, nam, ifp);
#ifdef INET6
case PF_INET6:
return in6_control(so, cmd, nam, ifp);
#endif
default:
return EAFNOSUPPORT;
}
}
static int
tcp_stat(struct socket *so, struct stat *ub)
{
KASSERT(solocked(so));
/* stat: don't bother with a blocksize. */
return 0;
}
static int
tcp_peeraddr(struct socket *so, struct sockaddr *nam)
{
struct inpcb *inp;
struct tcpcb *tp;
int ostate = 0;
int s;
inp = sotoinpcb(so);
tp = intotcpcb(inp);
ostate = tcp_debug_capture(tp, PRU_PEERADDR);
s = splsoftnet();
if (inp->inp_af == AF_INET) {
in_setpeeraddr(inp, (struct sockaddr_in *)nam);
}
#ifdef INET6
else if (inp->inp_af == AF_INET6) {
in6_setpeeraddr(inp, (struct sockaddr_in6 *)nam);
}
#endif
tcp_debug_trace(so, tp, ostate, PRU_PEERADDR);
splx(s);
return 0;
}
static int
tcp_sockaddr(struct socket *so, struct sockaddr *nam)
{
struct inpcb *inp;
struct tcpcb *tp;
int ostate = 0;
int s;
inp = sotoinpcb(so);
tp = intotcpcb(inp);
ostate = tcp_debug_capture(tp, PRU_SOCKADDR);
s = splsoftnet();
if (inp->inp_af == AF_INET) {
in_setsockaddr(inp, (struct sockaddr_in *)nam);
}
#ifdef INET6
if (inp->inp_af == AF_INET6) {
in6_setsockaddr(inp, (struct sockaddr_in6 *)nam);
}
#endif
tcp_debug_trace(so, tp, ostate, PRU_SOCKADDR);
splx(s);
return 0;
}
static int
tcp_rcvd(struct socket *so, int flags, struct lwp *l)
{
struct inpcb *inp;
struct tcpcb *tp;
int ostate = 0;
int s;
inp = sotoinpcb(so);
tp = intotcpcb(inp);
ostate = tcp_debug_capture(tp, PRU_RCVD);
/*
* After a receive, possibly send window update to peer.
*
* soreceive() calls this function when a user receives
* ancillary data on a listening socket. We don't call
* tcp_output in such a case, since there is no header
* template for a listening socket and hence the kernel
* will panic.
*/
s = splsoftnet();
if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) != 0)
(void) tcp_output(tp);
splx(s);
tcp_debug_trace(so, tp, ostate, PRU_RCVD);
return 0;
}
static int
tcp_recvoob(struct socket *so, struct mbuf *m, int flags)
{
struct inpcb *inp;
struct tcpcb *tp;
int ostate = 0;
int s;
inp = sotoinpcb(so);
tp = intotcpcb(inp);
ostate = tcp_debug_capture(tp, PRU_RCVOOB);
s = splsoftnet();
if ((so->so_oobmark == 0 &&
(so->so_state & SS_RCVATMARK) == 0) ||
so->so_options & SO_OOBINLINE ||
tp->t_oobflags & TCPOOB_HADDATA) {
splx(s);
return EINVAL;
}
if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
splx(s);
return EWOULDBLOCK;
}
m->m_len = 1;
*mtod(m, char *) = tp->t_iobc;
if ((flags & MSG_PEEK) == 0) {
tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
so->so_state &= ~SS_POLLRDBAND;
}
tcp_debug_trace(so, tp, ostate, PRU_RCVOOB);
splx(s);
return 0;
}
static int
tcp_send(struct socket *so, struct mbuf *m, struct sockaddr *nam,
struct mbuf *control, struct lwp *l)
{
struct inpcb *inp;
struct tcpcb *tp;
int ostate = 0;
int error = 0;
int s;
inp = sotoinpcb(so);
tp = intotcpcb(inp);
ostate = tcp_debug_capture(tp, PRU_SEND);
/*
* Do a send by putting data in output queue and updating urgent
* marker if URG set. Possibly send more data.
*/
s = splsoftnet();
if (control && control->m_len) {
m_freem(control);
m_freem(m);
tcp_debug_trace(so, tp, ostate, PRU_SEND);
splx(s);
return EINVAL;
}
sbappendstream(&so->so_snd, m);
error = tcp_output(tp);
tcp_debug_trace(so, tp, ostate, PRU_SEND);
splx(s);