/*
* 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_WLOCK(&tcbinfo);
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL"));
INP_LOCK(inp);
if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
error = ECONNRESET;
goto out;
}
tp = intotcpcb(inp);
TCPDEBUG1();
tcp_disconnect(tp);
out:
TCPDEBUG2(PRU_DISCONNECT);
INP_UNLOCK(inp);
INP_INFO_WUNLOCK(&tcbinfo);
return (error);
}
/*
* 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;
//printf("tcp_usr_shutdown: called\n");
TCPDEBUG0;
INP_INFO_WLOCK(&tcbinfo);
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("inp == NULL"));
INP_LOCK(inp);
if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
error = ECONNRESET;
goto out;
}
tp = intotcpcb(inp);
TCPDEBUG1();
socantsendmore(so);
tcp_usrclosed(tp);
error = tcp_output(tp);
out:
TCPDEBUG2(PRU_SHUTDOWN);
INP_UNLOCK(inp);
INP_INFO_WUNLOCK(&tcbinfo);
return (error);
}
/*
* 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_WLOCK(&tcbinfo);
INP_LOCK(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_vflag & INP_TIMEWAIT) &&
!(inp->inp_vflag & INP_DROPPED)) {
tp = intotcpcb(inp);
TCPDEBUG1();
tcp_disconnect(tp);
TCPDEBUG2(PRU_CLOSE);
}
if (!(inp->inp_vflag & INP_DROPPED)) {
SOCK_LOCK(so);
so->so_state |= SS_PROTOREF;
SOCK_UNLOCK(so);
inp->inp_vflag |= INP_SOCKREF;
}
INP_UNLOCK(inp);
INP_INFO_WUNLOCK(&tcbinfo);
}
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_INFO_WLOCK(&tcbinfo);
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL"));
INP_LOCK(inp);
if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
error = EINVAL;
goto out;
}
tp = intotcpcb(inp);
TCPDEBUG1();
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 = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0)
goto out;
error = tcp_output(tp);
goto out;
}
inp->inp_vflag &= ~INP_IPV4;
inp->inp_vflag |= INP_IPV6;
inp->inp_inc.inc_isipv6 = 1;
if ((error = tcp6_connect(tp, nam, td)) != 0)
goto out;
error = tcp_output(tp);
out:
TCPDEBUG2(PRU_CONNECT);
INP_UNLOCK(inp);
INP_INFO_WUNLOCK(&tcbinfo);
return (error);
}
/*
* 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;
#ifdef INET6
int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != 0;
#endif
//printf("tcp_attach: called so->so_snd=0x%lx\n", (long)&so->so_snd);
//printf("tcp_attach: called so->so_rcv=0x%lx\n", (long)&so->so_rcv);
if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
//printf("tcp_attach: called 2\n");
error = soreserve(so, tcp_sendspace, tcp_recvspace);
if (error)
return (error);
}
//printf("tcp_attach: called 2\n");
so->so_rcv.sb_flags |= SB_AUTOSIZE;
so->so_snd.sb_flags |= SB_AUTOSIZE;
INP_INFO_WLOCK(&tcbinfo);
error = in_pcballoc(so, &tcbinfo);
if (error) {
INP_INFO_WUNLOCK(&tcbinfo);
return (error);
}
inp = sotoinpcb(so);
#ifdef INET6
if (isipv6) {
inp->inp_vflag |= INP_IPV6;
inp->in6p_hops = -1; /* use kernel default */
}
else
#endif
inp->inp_vflag |= INP_IPV4;
//printf("tcp_attach: called 5\n");
tp = tcp_newtcpcb(inp);
if (tp == NULL) {
#ifdef INET6
if (isipv6) {
in6_pcbdetach(inp);
in6_pcbfree(inp);
} else {
#endif
in_pcbdetach(inp);
in_pcbfree(inp);
#ifdef INET6
}
#endif
INP_INFO_WUNLOCK(&tcbinfo);
return (ENOBUFS);
}
tp->t_state = TCPS_CLOSED;
INP_UNLOCK(inp);
INP_INFO_WUNLOCK(&tcbinfo);
//printf("tcp_attach: called 10\n");
return (0);
}
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_INFO_WLOCK(&tcbinfo);
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL"));
INP_LOCK(inp);
if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
error = EINVAL;
goto out;
}
tp = intotcpcb(inp);
TCPDEBUG1();
inp->inp_vflag &= ~INP_IPV4;
inp->inp_vflag |= INP_IPV6;
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);
goto out;
}
}
error = in6_pcbbind(inp, nam, td->td_ucred);
out:
TCPDEBUG2(PRU_BIND);
INP_UNLOCK(inp);
INP_INFO_WUNLOCK(&tcbinfo);
return (error);
}
/*
* 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;
//printf("tcp_usr_connect: called \n");
sinp = (struct sockaddr_in *)nam;
if (nam->sa_len != sizeof (*sinp))
return (EINVAL);
//printf("tcp_usr_connect: called family=%d\n", sinp->sin_family);
/*
* Must disallow TCP ``connections'' to multicast addresses.
*/
if (sinp->sin_family == AF_INET
&& IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
return (EAFNOSUPPORT);
//printf("tcp_usr_connect: called 3\n");
#ifdef MAXHE_TODO
if (jailed(td->td_ucred))
prison_remote_ip(td->td_ucred, 0, &sinp->sin_addr.s_addr);
#endif // MAXHE_TODO
TCPDEBUG0;
INP_INFO_WLOCK(&tcbinfo);
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL"));
INP_LOCK(inp);
#ifdef MAXHE_TODO
if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
error = EINVAL;
//printf("tcp_usr_connect: error = EINVAL\n");
goto out;
}
#endif // MAXHE_TODO
tp = intotcpcb(inp);
TCPDEBUG1();
//printf("tcp_usr_connect: calling tcp_connect\n");
if ((error = tcp_connect(tp, nam, td)) != 0)
goto out;
error = tcp_output(tp);
out:
//printf("tcp_usr_connect: return error=%d\n", error);
TCPDEBUG2(PRU_CONNECT);
INP_UNLOCK(inp);
INP_INFO_WUNLOCK(&tcbinfo);
return (error);
}
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_LOCK(inp);
if (inp->inp_vflag & (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);
INP_UNLOCK(inp);
if (error == 0) {
if (v4)
*nam = in6_v4mapsin6_sockaddr(port, &addr);
else
*nam = in6_sockaddr(port, &addr6);
}
return error;
}
/*
* RTO timer activated
*/
void
tcplike_rto_timeout(void *ccb)
{
struct tcplike_send_ccb *cb = (struct tcplike_send_ccb *) ccb;
/*struct inpcb *inp;*/
int s;
mutex_enter(&(cb->mutex));
cb->ssthresh = cb->cwnd >>1;
cb->cwnd = 1; /* allowing 1 packet to be sent */
cb->outstanding = 0; /* is this correct? */
cb->rto_timer_callout = 0;
cb->rto = cb->rto << 1;
TIMEOUT_DEBUG((LOG_INFO, "RTO Timeout. New RTO = %u\n", cb->rto));
cb->sample_rtt = 0;
cb->ack_last = 0;
cb->ack_miss = 0;
cb->rcvr_ackratio = 1; /* Constraint 2 & 3. We need ACKs asap */
dccp_remove_feature(cb->pcb, DCCP_OPT_CHANGE_R, DCCP_FEATURE_ACKRATIO);
dccp_add_feature(cb->pcb, DCCP_OPT_CHANGE_R, DCCP_FEATURE_ACKRATIO,
(char *) &cb->rcvr_ackratio, 1);
cb->acked_in_win = 0;
cb->acked_windows = 0;
cb->oldcwnd_ts = cb->pcb->seq_snd;
LOSS_DEBUG((LOG_INFO, "Timeout. CWND value: %u , OUTSTANDING value: %u\n",
cb->cwnd, cb->outstanding));
mutex_exit(&(cb->mutex));
/* lock'n run dccp_output */
s = splnet();
INP_INFO_RLOCK(&dccpbinfo);
/*inp = cb->pcb->d_inpcb;*/
INP_LOCK(inp);
INP_INFO_RUNLOCK(&dccpbinfo);
dccp_output(cb->pcb, 1);
INP_UNLOCK(inp);
splx(s);
}
/*
* 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;
//printf("%s: called\n", __FUNCTION__);
TCPDEBUG0;
INP_INFO_WLOCK(&tcbinfo);
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL"));
INP_LOCK(inp);
if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
error = EINVAL;
goto out;
}
tp = intotcpcb(inp);
TCPDEBUG1();
SOCK_LOCK(so);
error = solisten_proto_check(so);
//printf("%s: error=%d\n", __FUNCTION__, error);
#ifdef MAXHE_TODO
if (error == 0 && inp->inp_lport == 0)
error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
#else
if (error == 0 && inp->inp_lport == 0)
error = in_pcbbind(inp, (struct sockaddr *)0, NULL);
#endif // MAXHE_TODO
if (error == 0) {
tp->t_state = TCPS_LISTEN;
//printf("%s: solisten_proto backlog=%d\n", __FUNCTION__, backlog);
solisten_proto(so, backlog);
}
SOCK_UNLOCK(so);
//printf("%s: called done\n", __FUNCTION__);
out:
//printf("%s: called out\n", __FUNCTION__);
TCPDEBUG2(PRU_LISTEN);
INP_UNLOCK(inp);
INP_INFO_WUNLOCK(&tcbinfo);
return (error);
}
/*
* 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;
//printf("%s: called \n", __FUNCTION__);
if (so->so_state & SS_ISDISCONNECTED)
return (ECONNABORTED);
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL"));
INP_INFO_RLOCK(&tcbinfo);
INP_LOCK(inp);
if (inp->inp_vflag & (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;
//printf("%s: called 5\n", __FUNCTION__);
out:
//printf("%s: called out\n", __FUNCTION__);
TCPDEBUG2(PRU_ACCEPT);
INP_UNLOCK(inp);
INP_INFO_RUNLOCK(&tcbinfo);
if (error == 0)
*nam = in_sockaddr(port, &addr);
return error;
}
/*
* 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);
//printf("%s: called 0.5\n", __FUNCTION__);
/*
* 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_INFO_WLOCK(&tcbinfo);
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL"));
INP_LOCK(inp);
if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
error = EINVAL;
goto out;
}
tp = intotcpcb(inp);
TCPDEBUG1();
#ifdef MAXHE_TODO
error = in_pcbbind(inp, nam, td->td_ucred);
#else
error = in_pcbbind(inp, nam, NULL);
#endif
out:
TCPDEBUG2(PRU_BIND);
INP_UNLOCK(inp);
INP_INFO_WUNLOCK(&tcbinfo);
return (error);
}
/*
* 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_LOCK(inp);
if (inp->inp_vflag & (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);
INP_UNLOCK(inp);
return (error);
}
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_INFO_WLOCK(&tcbinfo);
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL"));
INP_LOCK(inp);
if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
error = EINVAL;
goto out;
}
tp = intotcpcb(inp);
TCPDEBUG1();
SOCK_LOCK(so);
error = solisten_proto_check(so);
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);
}
if (error == 0) {
tp->t_state = TCPS_LISTEN;
solisten_proto(so, backlog);
}
SOCK_UNLOCK(so);
out:
TCPDEBUG2(PRU_LISTEN);
INP_UNLOCK(inp);
INP_INFO_WUNLOCK(&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_LOCK(inp);
if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
error = ECONNRESET;
goto out;
}
tp = intotcpcb(inp);
TCPDEBUG1();
tcp_output(tp);
out:
TCPDEBUG2(PRU_RCVD);
INP_UNLOCK(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;
int headlocked = 0;
#ifdef INET6
int isipv6;
#endif
TCPDEBUG0;
//printf("tcp_usr_send: called\n");
/*
* We require the pcbinfo lock in two cases:
*
* (1) An implied connect is taking place, which can result in
* binding IPs and ports and hence modification of the pcb hash
* chains.
*
* (2) PRUS_EOF is set, resulting in explicit close on the send.
*/
if ((nam != NULL) || (flags & PRUS_EOF)) {
INP_INFO_WLOCK(&tcbinfo);
headlocked = 1;
}
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL"));
INP_LOCK(inp);
if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
if (control)
m_freem(control);
if (m)
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)) {
//printf("===tcp_usr_send(1): ===> so->so_snd.sb_cc=%d\n", so->so_snd.sb_cc);
sbappendstream(&so->so_snd, m);
//printf("===tcp_usr_send(1.5): ===> so->so_snd.sb_cc=%d\n", so->so_snd.sb_cc);
//printf("===tcp_usr_send(1.7): ===> m->m_data=0x%lx m->m_len=%d\n",
// (long)m->m_data, m->m_len);
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.
*/
INP_INFO_WLOCK_ASSERT(&tcbinfo);
#ifdef INET6
if (isipv6)
error = tcp6_connect(tp, nam, td);
else
#endif /* INET6 */
error = tcp_connect(tp, nam, td);
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_WLOCK_ASSERT(&tcbinfo);
socantsendmore(so);
tcp_usrclosed(tp);
}
if (headlocked) {
INP_INFO_WUNLOCK(&tcbinfo);
headlocked = 0;
}
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 {
/*
* 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);
//printf("===tcp_usr_send(2): ===> m->m_data=0x%lx m->m_len=%d\n",
// (long)m->m_data, m->m_len);
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/maxopd using peer's cached
* MSS.
*/
INP_INFO_WLOCK_ASSERT(&tcbinfo);
#ifdef INET6
if (isipv6)
error = tcp6_connect(tp, nam, td);
else
#endif /* INET6 */
error = tcp_connect(tp, nam, td);
if (error)
goto out;
tp->snd_wnd = TTCP_CLIENT_SND_WND;
tcp_mss(tp, -1);
INP_INFO_WUNLOCK(&tcbinfo);
headlocked = 0;
} else if (nam) {
INP_INFO_WUNLOCK(&tcbinfo);
headlocked = 0;
}
tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
tp->t_flags |= TF_FORCEDATA;
#ifdef MAXHE_TODO
error = tcp_output(tp);
#else
if(so->nkn_where==0) {
error = tcp_output(tp);
}
else {
error = 0;
}
#endif // MAXHE_TODO
tp->t_flags &= ~TF_FORCEDATA;
}
out:
TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB :
((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
INP_UNLOCK(inp);
if (headlocked)
INP_INFO_WUNLOCK(&tcbinfo);
return (error);
}
/*
* 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.)
*
* XXXRW: The locking here is wrong; we may take a page fault while holding
* the inpcb lock.
*/
int
tcp_ctloutput(struct socket *so, struct sockopt *sopt)
{
int error, opt, optval;
struct inpcb *inp;
struct tcpcb *tp;
struct tcp_info ti;
error = 0;
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL"));
INP_LOCK(inp);
if (sopt->sopt_level != IPPROTO_TCP) {
INP_UNLOCK(inp);
#ifdef INET6
if (INP_CHECK_SOCKAF(so, AF_INET6))
error = ip6_ctloutput(so, sopt);
else
#endif /* INET6 */
error = ip_ctloutput(so, sopt);
return (error);
}
if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
error = ECONNRESET;
goto out;
}
tp = intotcpcb(inp);
switch (sopt->sopt_dir) {
case SOPT_SET:
switch (sopt->sopt_name) {
#ifdef TCP_SIGNATURE
case TCP_MD5SIG:
error = sooptcopyin(sopt, &optval, sizeof optval,
sizeof 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:
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 &&
optval + 40 >= tcp_minmss)
tp->t_maxseg = optval;
else
error = EINVAL;
break;
case TCP_INFO:
error = EINVAL;
break;
default:
error = ENOPROTOOPT;
break;
}
break;
case SOPT_GET:
switch (sopt->sopt_name) {
#ifdef TCP_SIGNATURE
case TCP_MD5SIG:
optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0;
error = sooptcopyout(sopt, &optval, sizeof optval);
break;
#endif
case TCP_NODELAY:
optval = tp->t_flags & TF_NODELAY;
error = sooptcopyout(sopt, &optval, sizeof optval);
break;
case TCP_MAXSEG:
optval = tp->t_maxseg;
error = sooptcopyout(sopt, &optval, sizeof optval);
break;
case TCP_NOOPT:
optval = tp->t_flags & TF_NOOPT;
error = sooptcopyout(sopt, &optval, sizeof optval);
break;
case TCP_NOPUSH:
optval = tp->t_flags & TF_NOPUSH;
error = sooptcopyout(sopt, &optval, sizeof optval);
break;
case TCP_INFO:
tcp_fill_info(tp, &ti);
error = sooptcopyout(sopt, &ti, sizeof ti);
break;
default:
error = ENOPROTOOPT;
break;
}
break;
}
out:
INP_UNLOCK(inp);
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;
#ifdef INET6
int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != 0;
#endif
INP_INFO_WLOCK_ASSERT(&tcbinfo);
INP_LOCK_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_vflag & 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?
*/
if (inp->inp_vflag & INP_DROPPED) {
KASSERT(tp == NULL, ("tcp_detach: INP_TIMEWAIT && "
"INP_DROPPED && tp != NULL"));
#ifdef INET6
if (isipv6) {
in6_pcbdetach(inp);
in6_pcbfree(inp);
} else {
#endif
in_pcbdetach(inp);
in_pcbfree(inp);
#ifdef INET6
}
#endif
} else {
#ifdef INET6
if (isipv6)
in6_pcbdetach(inp);
else
#endif
in_pcbdetach(inp);
INP_UNLOCK(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_vflag & INP_DROPPED ||
tp->t_state < TCPS_SYN_SENT) {
tcp_discardcb(tp);
#ifdef INET6
if (isipv6) {
in6_pcbdetach(inp);
in6_pcbfree(inp);
} else {
#endif
in_pcbdetach(inp);
in_pcbfree(inp);
#ifdef INET6
}
#endif
} else {
#ifdef INET6
if (isipv6)
in6_pcbdetach(inp);
else
#endif
in_pcbdetach(inp);
}
}
}
