#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <sys/mbuf.h>
#if INET6
#include <sys/domain.h>
#endif
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/protosw.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#if INET6
#include <netinet/ip6.h>
#endif
#include <netinet/in_pcb.h>
#if INET6
#include <netinet6/in6_pcb.h>
#endif
#include <netinet/in_var.h>
#include <netinet/ip_var.h>
#if INET6
#include <netinet6/ip6_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/tcpip.h>
#if TCPDEBUG
#include <netinet/tcp_debug.h>
#endif
#if IPSEC
#include <netinet6/ipsec.h>
#endif
extern char *tcpstates[];
static int tcp_attach __P((struct socket *, struct proc *));
static int tcp_connect __P((struct tcpcb *, struct sockaddr *,
struct proc *));
#if INET6
static int tcp6_connect __P((struct tcpcb *, struct sockaddr *,
struct proc *));
#endif
static struct tcpcb *
tcp_disconnect __P((struct tcpcb *));
static struct tcpcb *
tcp_usrclosed __P((struct tcpcb *));
#if 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
static int
tcp_usr_attach(struct socket *so, int proto, struct proc *p)
{
int s = splnet();
int error;
struct inpcb *inp = sotoinpcb(so);
struct tcpcb *tp = 0;
TCPDEBUG0;
TCPDEBUG1();
if (inp) {
error = EISCONN;
goto out;
}
error = tcp_attach(so, p);
if (error)
goto out;
if ((so->so_options & SO_LINGER) && so->so_linger == 0)
so->so_linger = TCP_LINGERTIME * hz;
tp = sototcpcb(so);
out:
TCPDEBUG2(PRU_ATTACH);
splx(s);
return error;
}
static int
tcp_usr_detach(struct socket *so)
{
int s = splnet();
int error = 0;
struct inpcb *inp = sotoinpcb(so);
struct tcpcb *tp;
TCPDEBUG0;
if (inp == 0) {
splx(s);
return EINVAL;
}
tp = intotcpcb(inp);
if (tp == 0)
goto out;
TCPDEBUG1();
tp = tcp_disconnect(tp);
out:
TCPDEBUG2(PRU_DETACH);
splx(s);
return error;
}
#define COMMON_START() TCPDEBUG0; \
do { \
if (inp == 0) { \
splx(s); \
return EINVAL; \
} \
tp = intotcpcb(inp); \
TCPDEBUG1(); \
} while(0)
#define COMMON_END(req) out: TCPDEBUG2(req); splx(s); return error; goto out
static int
tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
{
int s = splnet();
int error = 0;
struct inpcb *inp = sotoinpcb(so);
struct tcpcb *tp;
struct sockaddr_in *sinp;
COMMON_START();
sinp = (struct sockaddr_in *)nam;
if (sinp->sin_family == AF_INET &&
IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
error = EAFNOSUPPORT;
goto out;
}
error = in_pcbbind(inp, nam, p);
if (error)
goto out;
COMMON_END(PRU_BIND);
}
#if INET6
static int
tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
{
int s = splnet();
int error = 0;
struct inpcb *inp = sotoinpcb(so);
struct tcpcb *tp;
struct sockaddr_in6 *sin6p;
COMMON_START();
sin6p = (struct sockaddr_in6 *)nam;
if (sin6p->sin6_family == AF_INET6 &&
IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
error = EAFNOSUPPORT;
goto out;
}
inp->inp_vflag &= ~INP_IPV4;
inp->inp_vflag |= INP_IPV6;
if (ip6_mapped_addr_on && (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, p);
goto out;
}
}
error = in6_pcbbind(inp, nam, p);
if (error)
goto out;
COMMON_END(PRU_BIND);
}
#endif
static int
tcp_usr_listen(struct socket *so, struct proc *p)
{
int s = splnet();
int error = 0;
struct inpcb *inp = sotoinpcb(so);
struct tcpcb *tp;
COMMON_START();
if (inp->inp_lport == 0)
error = in_pcbbind(inp, (struct sockaddr *)0, p);
if (error == 0)
tp->t_state = TCPS_LISTEN;
COMMON_END(PRU_LISTEN);
}
#if INET6
static int
tcp6_usr_listen(struct socket *so, struct proc *p)
{
int s = splnet();
int error = 0;
struct inpcb *inp = sotoinpcb(so);
struct tcpcb *tp;
COMMON_START();
if (inp->inp_lport == 0) {
inp->inp_vflag &= ~INP_IPV4;
if (ip6_mapped_addr_on &&
(inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
inp->inp_vflag |= INP_IPV4;
error = in6_pcbbind(inp, (struct sockaddr *)0, p);
}
if (error == 0)
tp->t_state = TCPS_LISTEN;
COMMON_END(PRU_LISTEN);
}
#endif
static int
tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct proc *p)
{
int s = splnet();
int error = 0;
struct inpcb *inp = sotoinpcb(so);
struct tcpcb *tp;
struct sockaddr_in *sinp;
COMMON_START();
sinp = (struct sockaddr_in *)nam;
if (sinp->sin_family == AF_INET
&& IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
error = EAFNOSUPPORT;
goto out;
}
#ifndef __APPLE__
prison_remote_ip(p, 0, &sinp->sin_addr.s_addr);
#endif
if ((error = tcp_connect(tp, nam, p)) != 0)
goto out;
error = tcp_output(tp);
COMMON_END(PRU_CONNECT);
}
#if INET6
static int
tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct proc *p)
{
int s = splnet();
int error = 0;
struct inpcb *inp = sotoinpcb(so);
struct tcpcb *tp;
struct sockaddr_in6 *sin6p;
COMMON_START();
sin6p = (struct sockaddr_in6 *)nam;
if (sin6p->sin6_family == AF_INET6
&& IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
error = EAFNOSUPPORT;
goto out;
}
if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
struct sockaddr_in sin;
if (!ip6_mapped_addr_on ||
(inp->inp_flags & IN6P_IPV6_V6ONLY))
return(EINVAL);
in6_sin6_2_sin(&sin, sin6p);
inp->inp_vflag |= INP_IPV4;
inp->inp_vflag &= ~INP_IPV6;
if ((error = tcp_connect(tp, (struct sockaddr *)&sin, p)) != 0)
goto out;
error = tcp_output(tp);
goto out;
}
inp->inp_vflag &= ~INP_IPV4;
inp->inp_vflag |= INP_IPV6;
if ((error = tcp6_connect(tp, nam, p)) != 0)
goto out;
error = tcp_output(tp);
if (error)
goto out;
COMMON_END(PRU_CONNECT);
}
#endif
static int
tcp_usr_disconnect(struct socket *so)
{
int s = splnet();
int error = 0;
struct inpcb *inp = sotoinpcb(so);
struct tcpcb *tp;
COMMON_START();
if (tp == 0)
goto out;
tp = tcp_disconnect(tp);
COMMON_END(PRU_DISCONNECT);
}
static int
tcp_usr_accept(struct socket *so, struct sockaddr **nam)
{
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();
in_setpeeraddr(so, nam);
COMMON_END(PRU_ACCEPT);
}
#if INET6
static int
tcp6_usr_accept(struct socket *so, struct sockaddr **nam)
{
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
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);
if (tp == 0)
goto out;
tp = tcp_usrclosed(tp);
if (tp)
error = tcp_output(tp);
COMMON_END(PRU_SHUTDOWN);
}
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();
if (tp == 0)
goto out;
tcp_output(tp);
COMMON_END(PRU_RCVD);
}
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;
#if INET6
int isipv6;
#endif
TCPDEBUG0;
if (inp == NULL) {
if (m)
m_freem(m);
if (control)
m_freem(control);
error = ECONNRESET;
tp = NULL;
TCPDEBUG1();
goto out;
}
#if INET6
isipv6 = nam && nam->sa_family == AF_INET6;
#endif
tp = intotcpcb(inp);
TCPDEBUG1();
if (control) {
if (control->m_len) {
m_freem(control);
if (m)
m_freem(m);
error = EINVAL;
goto out;
}
m_freem(control);
}
if(!(flags & PRUS_OOB)) {
sbappend(&so->so_snd, m);
if (nam && tp->t_state < TCPS_SYN_SENT) {
#if INET6
if (isipv6)
error = tcp6_connect(tp, nam, p);
else
#endif
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) {
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;
}
sbappend(&so->so_snd, m);
if (nam && tp->t_state < TCPS_SYN_SENT) {
#if INET6
if (isipv6)
error = tcp6_connect(tp, nam, p);
else
#endif
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));
}
static int
tcp_usr_abort(struct socket *so)
{
int s = splnet();
int error = 0;
struct inpcb *inp = sotoinpcb(so);
struct tcpcb *tp;
COMMON_START();
if (tp == 0)
goto out;
tp = tcp_drop(tp, ECONNABORTED);
COMMON_END(PRU_ABORT);
}
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);
}
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
};
#if 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
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;
}
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 &&
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 ? ifaddr->sin_addr.s_addr :
inp->inp_laddr.s_addr) == sin->sin_addr.s_addr &&
inp->inp_lport == sin->sin_port)
return EINVAL;
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);
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;
tp->t_timer[TCPT_KEEP] = tcp_keepinit;
tp->iss = tcp_new_isn(tp);
tcp_sendseqinit(tp);
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;
}
#if 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;
}
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 &&
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);
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;
tp->t_timer[TCPT_KEEP] = tcp_keepinit;
tp->iss = tcp_new_isn(tp);
tcp_sendseqinit(tp);
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
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();
inp = sotoinpcb(so);
if (inp == NULL) {
splx(s);
return (ECONNRESET);
}
if (sopt->sopt_level != IPPROTO_TCP) {
#if INET6
if (INP_CHECK_SOCKAF(so, AF_INET6))
error = ip6_ctloutput(so, sopt);
else
#endif
error = ip_ctloutput(so, sopt);
splx(s);
return (error);
}
tp = intotcpcb(inp);
if (tp == NULL) {
splx(s);
return (ECONNRESET);
}
switch (sopt->sopt_dir) {
case SOPT_SET:
switch (sopt->sopt_name) {
case TCP_NODELAY:
case TCP_NOOPT:
case TCP_NOPUSH:
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;
case TCP_NOPUSH:
opt = TF_NOPUSH;
break;
default:
opt = 0;
break;
}
if (optval)
tp->t_flags |= opt;
else
tp->t_flags &= ~opt;
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);
}
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");
static int
tcp_attach(so, p)
struct socket *so;
struct proc *p;
{
register struct tcpcb *tp;
struct inpcb *inp;
int error;
#if 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);
#if INET6
if (isipv6) {
inp->inp_vflag |= INP_IPV6;
inp->in6p_hops = -1;
}
else
#endif
inp->inp_vflag |= INP_IPV4;
tp = tcp_newtcpcb(inp);
if (tp == 0) {
int nofd = so->so_state & SS_NOFDREF;
so->so_state &= ~SS_NOFDREF;
#if INET6
if (isipv6)
in6_pcbdetach(inp);
else
#endif
in_pcbdetach(inp);
so->so_state |= nofd;
return (ENOBUFS);
}
tp->t_state = TCPS_CLOSED;
return (0);
}
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);
}
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);
if (tp->t_state == TCPS_FIN_WAIT_2)
tp->t_timer[TCPT_2MSL] = tcp_maxidle;
}
return (tp);
}