/*
* Connect from a socket to a specified address.
* Both address and port must be specified in argument sin6.
* Eventually, flow labels will have to be dealt with here, as well.
*
* If don't have a local address for this socket yet,
* then pick one.
*
* I believe this has to be called at splnet().
*/
int
in6_pcbconnect(struct inpcb *inp, struct mbuf *nam)
{
struct in6_addr *in6a = NULL;
struct sockaddr_in6 *sin6 = mtod(nam, struct sockaddr_in6 *);
struct ifnet *ifp = NULL; /* outgoing interface */
int error = 0;
struct sockaddr_in6 tmp;
(void)&in6a; /* XXX fool gcc */
if (nam->m_len != sizeof(*sin6))
return (EINVAL);
if (sin6->sin6_family != AF_INET6)
return (EAFNOSUPPORT);
if (sin6->sin6_port == 0)
return (EADDRNOTAVAIL);
/* reject IPv4 mapped address, we have no support for it */
if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
return EADDRNOTAVAIL;
/* sanity check for mapped address case */
if (IN6_IS_ADDR_V4MAPPED(&inp->inp_laddr6))
return EINVAL;
/* protect *sin6 from overwrites */
tmp = *sin6;
sin6 = &tmp;
/* KAME hack: embed scopeid */
if (in6_embedscope(&sin6->sin6_addr, sin6, inp, &ifp) != 0)
return EINVAL;
/* this must be cleared for ifa_ifwithaddr() */
sin6->sin6_scope_id = 0;
/* Source address selection. */
/*
* XXX: in6_selectsrc might replace the bound local address
* with the address specified by setsockopt(IPV6_PKTINFO).
* Is it the intended behavior?
*/
in6a = in6_selectsrc(sin6, inp->inp_outputopts6,
inp->inp_moptions6, &inp->inp_route6, &inp->inp_laddr6,
&error);
if (in6a == 0) {
if (error == 0)
error = EADDRNOTAVAIL;
return (error);
}
if (inp->inp_route6.ro_rt)
ifp = inp->inp_route6.ro_rt->rt_ifp;
inp->inp_ipv6.ip6_hlim = (u_int8_t)in6_selecthlim(inp, ifp);
if (in_pcblookup(inp->inp_table, &sin6->sin6_addr, sin6->sin6_port,
IN6_IS_ADDR_UNSPECIFIED(&inp->inp_laddr6) ? in6a : &inp->inp_laddr6,
inp->inp_lport, INPLOOKUP_IPV6)) {
return (EADDRINUSE);
}
if (IN6_IS_ADDR_UNSPECIFIED(&inp->inp_laddr6)) {
if (inp->inp_lport == 0)
(void)in6_pcbbind(inp, NULL, curproc);
inp->inp_laddr6 = *in6a;
}
inp->inp_faddr6 = sin6->sin6_addr;
inp->inp_fport = sin6->sin6_port;
inp->inp_flowinfo &= ~IPV6_FLOWLABEL_MASK;
if (ip6_auto_flowlabel)
inp->inp_flowinfo |=
(htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
in_pcbrehash(inp);
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;
}
/*
* Connect from a socket to a specified address.
* Both address and port must be specified in argument sin6.
* If don't have a local address for this socket yet,
* then pick one.
*/
int
in6_pcbconnect(void *v, struct mbuf *nam, struct lwp *l)
{
struct rtentry *rt;
struct in6pcb *in6p = v;
struct in6_addr *in6a = NULL;
struct sockaddr_in6 *sin6 = mtod(nam, struct sockaddr_in6 *);
struct ifnet *ifp = NULL; /* outgoing interface */
int error = 0;
int scope_ambiguous = 0;
#ifdef INET
struct in6_addr mapped;
#endif
struct sockaddr_in6 tmp;
(void)&in6a; /* XXX fool gcc */
if (in6p->in6p_af != AF_INET6)
return (EINVAL);
if (nam->m_len != sizeof(*sin6))
return (EINVAL);
if (sin6->sin6_family != AF_INET6)
return (EAFNOSUPPORT);
if (sin6->sin6_port == 0)
return (EADDRNOTAVAIL);
if (sin6->sin6_scope_id == 0 && !ip6_use_defzone)
scope_ambiguous = 1;
if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0)
return(error);
/* sanity check for mapped address case */
if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0)
return EINVAL;
if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr))
in6p->in6p_laddr.s6_addr16[5] = htons(0xffff);
if (!IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr))
return EINVAL;
} else
{
if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr))
return EINVAL;
}
/* protect *sin6 from overwrites */
tmp = *sin6;
sin6 = &tmp;
/* Source address selection. */
if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr) &&
in6p->in6p_laddr.s6_addr32[3] == 0) {
#ifdef INET
struct sockaddr_in sin, *sinp;
bzero(&sin, sizeof(sin));
sin.sin_len = sizeof(sin);
sin.sin_family = AF_INET;
bcopy(&sin6->sin6_addr.s6_addr32[3], &sin.sin_addr,
sizeof(sin.sin_addr));
sinp = in_selectsrc(&sin, &in6p->in6p_route,
in6p->in6p_socket->so_options, NULL, &error);
if (sinp == 0) {
if (error == 0)
error = EADDRNOTAVAIL;
return (error);
}
bzero(&mapped, sizeof(mapped));
mapped.s6_addr16[5] = htons(0xffff);
bcopy(&sinp->sin_addr, &mapped.s6_addr32[3], sizeof(sinp->sin_addr));
in6a = &mapped;
#else
return EADDRNOTAVAIL;
#endif
} else {
/*
* XXX: in6_selectsrc might replace the bound local address
* with the address specified by setsockopt(IPV6_PKTINFO).
* Is it the intended behavior?
*/
in6a = in6_selectsrc(sin6, in6p->in6p_outputopts,
in6p->in6p_moptions,
&in6p->in6p_route,
&in6p->in6p_laddr, &ifp, &error);
if (ifp && scope_ambiguous &&
(error = in6_setscope(&sin6->sin6_addr, ifp, NULL)) != 0) {
return(error);
}
if (in6a == 0) {
if (error == 0)
error = EADDRNOTAVAIL;
return (error);
}
}
if (ifp == NULL && (rt = rtcache_validate(&in6p->in6p_route)) != NULL)
ifp = rt->rt_ifp;
in6p->in6p_ip6.ip6_hlim = (u_int8_t)in6_selecthlim(in6p, ifp);
if (in6_pcblookup_connect(in6p->in6p_table, &sin6->sin6_addr,
sin6->sin6_port,
IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) ? in6a : &in6p->in6p_laddr,
in6p->in6p_lport, 0))
return (EADDRINUSE);
if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) ||
(IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr) &&
in6p->in6p_laddr.s6_addr32[3] == 0))
{
if (in6p->in6p_lport == 0) {
error = in6_pcbbind(in6p, (struct mbuf *)0, l);
if (error != 0)
return error;
}
in6p->in6p_laddr = *in6a;
}
in6p->in6p_faddr = sin6->sin6_addr;
in6p->in6p_fport = sin6->sin6_port;
in6_pcbstate(in6p, IN6P_CONNECTED);
in6p->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
if (ip6_auto_flowlabel)
in6p->in6p_flowinfo |=
(htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
#if defined(IPSEC) || defined(FAST_IPSEC)
if (in6p->in6p_socket->so_type == SOCK_STREAM)
ipsec_pcbconn(in6p->in6p_sp);
#endif
return (0);
}
