/*
* Outer subroutine:
* Connect from a socket to a specified address.
* Both address and port must be specified in argument sin.
* If don't have a local address for this socket yet,
* then pick one.
*/
int
in6_pcbconnect(
struct inpcb *inp,
struct sockaddr *nam,
struct proc *p)
{
struct in6_addr addr6;
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
struct inpcb *pcb;
int error;
unsigned int outif = 0;
/*
* Call inner routine, to assign local interface address.
* in6_pcbladdr() may automatically fill in sin6_scope_id.
*/
if ((error = in6_pcbladdr(inp, nam, &addr6, &outif)) != 0)
return(error);
socket_unlock(inp->inp_socket, 0);
pcb = 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);
socket_lock(inp->inp_socket, 0);
if (pcb != NULL) {
in_pcb_checkstate(pcb, WNT_RELEASE, pcb == inp ? 1 : 0);
return (EADDRINUSE);
}
if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
if (inp->inp_lport == 0) {
error = in6_pcbbind(inp, (struct sockaddr *)0, p);
if (error)
return (error);
}
inp->in6p_laddr = addr6;
inp->in6p_last_outif = outif;
}
if (!lck_rw_try_lock_exclusive(inp->inp_pcbinfo->mtx)) {
/*lock inversion issue, mostly with udp multicast packets */
socket_unlock(inp->inp_socket, 0);
lck_rw_lock_exclusive(inp->inp_pcbinfo->mtx);
socket_lock(inp->inp_socket, 0);
}
inp->in6p_faddr = sin6->sin6_addr;
inp->inp_fport = sin6->sin6_port;
/* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
if (inp->in6p_flags & IN6P_AUTOFLOWLABEL)
inp->in6p_flowinfo |=
(htonl(ip6_flow_seq++) & IPV6_FLOWLABEL_MASK);
in_pcbrehash(inp);
lck_rw_done(inp->inp_pcbinfo->mtx);
return (0);
}
static int
tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
{
struct inpcb *inp = tp->t_inpcb, *oinp;
struct socket *so = inp->inp_socket;
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
struct in6_addr addr6;
int error;
INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
INP_WLOCK_ASSERT(inp);
if (inp->inp_lport == 0) {
error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
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.
* in6_pcbladdr() also handles scope zone IDs.
*/
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)
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;
/* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
if (inp->inp_flags & IN6P_AUTOFLOWLABEL)
inp->inp_flow |=
(htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
in_pcbrehash(inp);
/* Compute window scaling to request. */
while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
(TCP_MAXWIN << tp->request_r_scale) < sb_max)
tp->request_r_scale++;
soisconnecting(so);
TCPSTAT_INC(tcps_connattempt);
tp->t_state = TCPS_SYN_SENT;
tcp_timer_activate(tp, TT_KEEP, tcp_keepinit);
tp->iss = tcp_new_isn(tp);
tp->t_bw_rtseq = tp->iss;
tcp_sendseqinit(tp);
return 0;
}
static void
tcp6_connect(netmsg_t msg)
{
struct tcpcb *tp;
struct socket *so = msg->connect.base.nm_so;
struct sockaddr *nam = msg->connect.nm_nam;
struct thread *td = msg->connect.nm_td;
struct inpcb *inp;
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
struct in6_addr *addr6;
#ifdef SMP
lwkt_port_t port;
#endif
int error;
COMMON_START(so, inp, 0);
/*
* Reconnect our pcb if we have to
*/
if (msg->connect.nm_reconnect & NMSG_RECONNECT_RECONNECT) {
msg->connect.nm_reconnect &= ~NMSG_RECONNECT_RECONNECT;
in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
}
/*
* Bind if we have to
*/
if (inp->inp_lport == 0) {
error = in6_pcbbind(inp, NULL, td);
if (error)
goto out;
}
/*
* Cannot simply call in_pcbconnect, because there might be an
* earlier incarnation of this same connection still in
* TIME_WAIT state, creating an ADDRINUSE error.
*/
error = in6_pcbladdr(inp, nam, &addr6, td);
if (error)
goto out;
#ifdef SMP
port = tcp6_addrport(); /* XXX hack for now, always cpu0 */
if (port != &curthread->td_msgport) {
struct route *ro = &inp->inp_route;
/*
* in_pcbladdr() may have allocated a route entry for us
* on the current CPU, but we need a route entry on the
* inpcb's owner CPU, so free it here.
*/
if (ro->ro_rt != NULL)
RTFREE(ro->ro_rt);
bzero(ro, sizeof(*ro));
in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
sosetport(so, port);
msg->connect.nm_reconnect |= NMSG_RECONNECT_RECONNECT;
msg->connect.base.nm_dispatch = tcp6_connect;
lwkt_forwardmsg(port, &msg->connect.base.lmsg);
/* msg invalid now */
return;
}
#endif
error = tcp6_connect_oncpu(tp, msg->connect.nm_flags,
&msg->connect.nm_m, sin6, addr6);
/* nm_m may still be intact */
out:
if (error && (msg->connect.nm_reconnect & NMSG_RECONNECT_FALLBACK)) {
tcp_connect(msg);
/* msg invalid now */
} else {
if (msg->connect.nm_m) {
m_freem(msg->connect.nm_m);
msg->connect.nm_m = NULL;
}
if (msg->connect.nm_reconnect & NMSG_RECONNECT_NAMALLOC) {
kfree(msg->connect.nm_nam, M_LWKTMSG);
msg->connect.nm_nam = NULL;
}
lwkt_replymsg(&msg->connect.base.lmsg, error);
/* msg invalid now */
}
}