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NetBSD/sys/netinet6/in6_pcb.c

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/* $NetBSD: in6_pcb.c,v 1.18 2000/02/03 13:17:39 itojun 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) 1982, 1986, 1991, 1993
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*
* @(#)in_pcb.c 8.2 (Berkeley) 1/4/94
*/
#include "opt_ipsec.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/ioctl.h>
#include <sys/errno.h>
#include <sys/time.h>
#include <sys/proc.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>
#include <netinet6/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/in6_pcb.h>
#include <netinet6/nd6.h>
#include "loop.h"
extern struct ifnet loif[NLOOP];
#include "faith.h"
#ifdef IPSEC
#include <netinet6/ipsec.h>
#include <netkey/key.h>
#include <netkey/key_debug.h>
#endif /* IPSEC */
struct in6_addr zeroin6_addr;
int
in6_pcballoc(so, head)
struct socket *so;
struct in6pcb *head;
{
struct in6pcb *in6p;
MALLOC(in6p, struct in6pcb *, sizeof(*in6p), M_PCB, M_NOWAIT);
if (in6p == NULL)
return(ENOBUFS);
bzero((caddr_t)in6p, sizeof(*in6p));
in6p->in6p_head = head;
in6p->in6p_socket = so;
in6p->in6p_hops = -1; /* use kernel default */
in6p->in6p_icmp6filt = NULL;
in6p->in6p_next = head->in6p_next;
head->in6p_next = in6p;
in6p->in6p_prev = head;
in6p->in6p_next->in6p_prev = in6p;
#ifndef INET6_BINDV6ONLY
if (ip6_bindv6only)
in6p->in6p_flags |= IN6P_BINDV6ONLY;
#else
in6p->in6p_flags |= IN6P_BINDV6ONLY; /*just for safety*/
#endif
so->so_pcb = (caddr_t)in6p;
return(0);
}
int
in6_pcbbind(in6p, nam)
register struct in6pcb *in6p;
struct mbuf *nam;
{
struct socket *so = in6p->in6p_socket;
struct in6pcb *head = in6p->in6p_head;
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL;
struct proc *p = curproc; /* XXX */
u_int16_t lport = 0;
int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
int error;
if (in6p->in6p_lport || !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr))
return(EINVAL);
if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0 &&
((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 ||
(so->so_options & SO_ACCEPTCONN) == 0))
wild = IN6PLOOKUP_WILDCARD;
if (nam) {
sin6 = mtod(nam, struct sockaddr_in6 *);
if (nam->m_len != sizeof(*sin6))
return(EINVAL);
/*
* We should check the family, but old programs
* incorrectly fail to intialize it.
*/
if (sin6->sin6_family != AF_INET6)
return(EAFNOSUPPORT);
/*
* If the scope of the destination is link-local, embed the
* interface index in the address.
*/
if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) {
/* XXX boundary check is assumed to be already done. */
/* XXX sin6_scope_id is weaker than advanced-api. */
struct in6_pktinfo *pi;
if (in6p->in6p_outputopts &&
(pi = in6p->in6p_outputopts->ip6po_pktinfo) &&
pi->ipi6_ifindex) {
sin6->sin6_addr.s6_addr16[1]
= htons(pi->ipi6_ifindex);
} else if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)
&& in6p->in6p_moptions
&& in6p->in6p_moptions->im6o_multicast_ifp) {
sin6->sin6_addr.s6_addr16[1] =
htons(in6p->in6p_moptions->im6o_multicast_ifp->if_index);
} else if (sin6->sin6_scope_id) {
/* boundary check */
if (sin6->sin6_scope_id < 0
|| if_index < sin6->sin6_scope_id) {
return ENXIO; /* XXX EINVAL? */
}
sin6->sin6_addr.s6_addr16[1]
= htons(sin6->sin6_scope_id & 0xffff);/*XXX*/
/* this must be cleared for ifa_ifwithaddr() */
sin6->sin6_scope_id = 0;
}
}
lport = sin6->sin6_port;
if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
/*
* Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
* allow compepte duplication of binding if
* SO_REUSEPORT is set, or if SO_REUSEADDR is set
* and a multicast address is bound on both
* new and duplicated sockets.
*/
if (so->so_options & SO_REUSEADDR)
reuseport = SO_REUSEADDR|SO_REUSEPORT;
} else if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
struct sockaddr_in sin;
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));
if (ifa_ifwithaddr((struct sockaddr *)&sin) == 0)
return EADDRNOTAVAIL;
} else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
struct ifaddr *ia = NULL;
sin6->sin6_port = 0; /* yech... */
#if defined(NFAITH) && NFAITH > 0
if ((in6p->in6p_flags & IN6P_FAITH) == 0
&& (ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0)
#else
if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0)
#endif
return(EADDRNOTAVAIL);
/*
* XXX: bind to an anycast address might accidentally
* cause sending a packet with anycast source address.
*/
if (ia != NULL) {
struct in6_ifaddr *ia6 = (void *)ia;
if (ia6->ia6_flags &
(IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
IN6_IFF_DETACHED|IN6_IFF_DEPRECATED))
return (EADDRNOTAVAIL);
}
}
if (lport) {
#ifndef IPNOPRIVPORTS
/* GROSS */
if (ntohs(lport) < IPV6PORT_RESERVED &&
(p == 0 ||
(error = suser(p->p_ucred, &p->p_acflag))))
return(EACCES);
#endif
if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
/* should check this but we can't ... */
#if 0
struct inpcb *t;
t = in_pcblookup_bind(&tcbtable,
(struct in_addr *)&sin6->sin6_addr.s6_addr32[3],
lport);
if (t && (reuseport & t->inp_socket->so_options) == 0)
return EADDRINUSE;
#endif
} else {
struct in6pcb *t;
t = in6_pcblookup(head, &zeroin6_addr, 0,
&sin6->sin6_addr, lport, wild);
if (t && (reuseport & t->in6p_socket->so_options) == 0)
return(EADDRINUSE);
}
}
in6p->in6p_laddr = sin6->sin6_addr;
}
if (lport == 0) {
int e;
if ((e = in6_pcbsetport(&in6p->in6p_laddr, in6p)) != 0)
return(e);
}
else
in6p->in6p_lport = lport;
in6p->in6p_flowinfo = sin6 ? sin6->sin6_flowinfo : 0; /*XXX*/
return(0);
}
/*
* Find an empty port and set it to the specified PCB.
*/
int
in6_pcbsetport(laddr, in6p)
struct in6_addr *laddr;
struct in6pcb *in6p;
{
struct socket *so = in6p->in6p_socket;
struct in6pcb *head = in6p->in6p_head;
u_int16_t last_port, lport = 0;
int wild = 0;
void *t;
u_int16_t min, max;
#ifndef IPNOPRIVPORTS
struct proc *p = curproc; /*XXX*/
#endif
/* XXX: this is redundant when called from in6_pcbbind */
if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0 &&
((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 ||
(so->so_options & SO_ACCEPTCONN) == 0))
wild = IN6PLOOKUP_WILDCARD;
if (in6p->in6p_flags & IN6P_LOWPORT) {
#ifndef IPNOPRIVPORTS
if (p == 0 || (suser(p->p_ucred, &p->p_acflag) != 0))
return (EACCES);
#endif
min = IPV6PORT_RESERVEDMIN;
max = IPV6PORT_RESERVEDMAX;
} else {
min = IPV6PORT_ANONMIN;
max = IPV6PORT_ANONMAX;
}
/* value out of range */
if (head->in6p_lport < min)
head->in6p_lport = min;
else if (head->in6p_lport > max)
head->in6p_lport = min;
last_port = head->in6p_lport;
goto startover; /*to randomize*/
for (;;) {
lport = htons(head->in6p_lport);
if (IN6_IS_ADDR_V4MAPPED(laddr)) {
#if 0
t = in_pcblookup_bind(&tcbtable,
(struct in_addr *)&in6p->in6p_laddr.s6_addr32[3],
lport);
#else
t = NULL;
#endif
} else {
t = in6_pcblookup(head, &zeroin6_addr, 0, laddr,
lport, wild);
}
if (t == 0)
break;
startover:
if (head->in6p_lport >= max)
head->in6p_lport = min;
else
head->in6p_lport++;
if (head->in6p_lport == last_port)
return (EADDRINUSE);
}
in6p->in6p_lport = lport;
return(0); /* success */
}
/*
* 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(in6p, nam)
struct in6pcb *in6p;
struct mbuf *nam;
{
struct in6_addr *in6a = NULL;
struct sockaddr_in6 *sin6 = mtod(nam, struct sockaddr_in6 *);
struct in6_pktinfo *pi;
struct ifnet *ifp = NULL; /* outgoing interface */
int error = 0;
struct in6_addr mapped;
(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);
/* sanity check for mapped address case */
if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
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;
}
/*
* If the scope of the destination is link-local, embed the interface
* index in the address.
*/
if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) {
/* XXX boundary check is assumed to be already done. */
/* XXX sin6_scope_id is weaker than advanced-api. */
if (in6p->in6p_outputopts &&
(pi = in6p->in6p_outputopts->ip6po_pktinfo) &&
pi->ipi6_ifindex) {
sin6->sin6_addr.s6_addr16[1] = htons(pi->ipi6_ifindex);
ifp = ifindex2ifnet[pi->ipi6_ifindex];
}
else if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr) &&
in6p->in6p_moptions &&
in6p->in6p_moptions->im6o_multicast_ifp) {
sin6->sin6_addr.s6_addr16[1] =
htons(in6p->in6p_moptions->im6o_multicast_ifp->if_index);
ifp = ifindex2ifnet[in6p->in6p_moptions->im6o_multicast_ifp->if_index];
} else if (sin6->sin6_scope_id) {
/* boundary check */
if (sin6->sin6_scope_id < 0
|| if_index < sin6->sin6_scope_id) {
return ENXIO; /* XXX EINVAL? */
}
sin6->sin6_addr.s6_addr16[1]
= htons(sin6->sin6_scope_id & 0xffff);/*XXX*/
ifp = ifindex2ifnet[sin6->sin6_scope_id];
}
}
/* Source address selection. */
if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr)
&& in6p->in6p_laddr.s6_addr32[3] == 0) {
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, (struct route *)&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 {
/*
* 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, &error);
if (in6a == 0) {
if (error == 0)
error = EADDRNOTAVAIL;
return(error);
}
}
if (in6p->in6p_route.ro_rt)
ifp = in6p->in6p_route.ro_rt->rt_ifp;
in6p->in6p_ip6.ip6_hlim = (u_int8_t)in6_selecthlim(in6p, ifp);
if (in6_pcblookup(in6p->in6p_head,
&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)
(void)in6_pcbbind(in6p, (struct mbuf *)0);
in6p->in6p_laddr = *in6a;
}
in6p->in6p_faddr = sin6->sin6_addr;
in6p->in6p_fport = sin6->sin6_port;
/*
* xxx kazu flowlabel is necessary for connect?
* but if this line is missing, the garbage value remains.
*/
in6p->in6p_flowinfo = sin6->sin6_flowinfo;
return(0);
}
/*
* Return an IPv6 address, which is the most appropriate for given
* destination and user specified options.
* If necessary, this function lookups the routing table and return
* an entry to the caller for later use.
*/
struct in6_addr *
in6_selectsrc(dstsock, opts, mopts, ro, laddr, errorp)
struct sockaddr_in6 *dstsock;
struct ip6_pktopts *opts;
struct ip6_moptions *mopts;
struct route_in6 *ro;
struct in6_addr *laddr;
int *errorp;
{
struct in6_addr *dst;
struct in6_ifaddr *ia6 = 0;
struct in6_pktinfo *pi = NULL;
dst = &dstsock->sin6_addr;
*errorp = 0;
/*
* If the source address is explicitly specified by the caller,
* use it.
*/
if (opts && (pi = opts->ip6po_pktinfo) &&
!IN6_IS_ADDR_UNSPECIFIED(&pi->ipi6_addr))
return(&pi->ipi6_addr);
/*
* If the source address is not specified but the socket(if any)
* is already bound, use the bound address.
*/
if (laddr && !IN6_IS_ADDR_UNSPECIFIED(laddr))
return(laddr);
/*
* If the caller doesn't specify the source address but
* the outgoing interface, use an address associated with
* the interface.
*/
if (pi && pi->ipi6_ifindex) {
/* XXX boundary check is assumed to be already done. */
ia6 = in6_ifawithscope(ifindex2ifnet[pi->ipi6_ifindex],
dst);
if (ia6 == 0) {
*errorp = EADDRNOTAVAIL;
return(0);
}
return(&satosin6(&ia6->ia_addr)->sin6_addr);
}
/*
* If the destination address is a link-local unicast address or
* a multicast address, and if the outgoing interface is specified
* by the sin6_scope_id filed, use an address associated with the
* interface.
* XXX: We're now trying to define more specific semantics of
* sin6_scope_id field, so this part will be rewritten in
* the near future.
*/
if ((IN6_IS_ADDR_LINKLOCAL(dst) || IN6_IS_ADDR_MULTICAST(dst)) &&
dstsock->sin6_scope_id) {
/*
* I'm not sure if boundary check for scope_id is done
* somewhere...
*/
if (dstsock->sin6_scope_id < 0 ||
if_index < dstsock->sin6_scope_id) {
*errorp = ENXIO; /* XXX: better error? */
return(0);
}
ia6 = in6_ifawithscope(ifindex2ifnet[dstsock->sin6_scope_id],
dst);
if (ia6 == 0) {
*errorp = EADDRNOTAVAIL;
return(0);
}
return(&satosin6(&ia6->ia_addr)->sin6_addr);
}
/*
* If the destination address is a multicast address and
* the outgoing interface for the address is specified
* by the caller, use an address associated with the interface.
* There is a sanity check here; if the destination has node-local
* scope, the outgoing interfacde should be a loopback address.
* Even if the outgoing interface is not specified, we also
* choose a loopback interface as the outgoing interface.
*/
if (IN6_IS_ADDR_MULTICAST(dst)) {
struct ifnet *ifp = mopts ? mopts->im6o_multicast_ifp : NULL;
if (ifp == NULL && IN6_IS_ADDR_MC_NODELOCAL(dst)) {
ifp = &loif[0];
}
if (ifp) {
ia6 = in6_ifawithscope(ifp, dst);
if (ia6 == 0) {
*errorp = EADDRNOTAVAIL;
return(0);
}
return(&satosin6(&ia6->ia_addr)->sin6_addr);
}
}
/*
* If the next hop address for the packet is specified
* by caller, use an address associated with the route
* to the next hop.
*/
{
struct sockaddr_in6 *sin6_next;
struct rtentry *rt;
if (opts && opts->ip6po_nexthop) {
sin6_next = satosin6(opts->ip6po_nexthop);
rt = nd6_lookup(&sin6_next->sin6_addr, 1, NULL);
if (rt) {
ia6 = in6_ifawithscope(rt->rt_ifp, dst);
if (ia6 == 0)
ia6 = ifatoia6(rt->rt_ifa);
}
if (ia6 == 0) {
*errorp = EADDRNOTAVAIL;
return(0);
}
return(&satosin6(&ia6->ia_addr)->sin6_addr);
}
}
/*
* If route is known or can be allocated now,
* our src addr is taken from the i/f, else punt.
*/
if (ro) {
if (ro->ro_rt &&
!IN6_ARE_ADDR_EQUAL(&satosin6(&ro->ro_dst)->sin6_addr, dst)) {
RTFREE(ro->ro_rt);
ro->ro_rt = (struct rtentry *)0;
}
if (ro->ro_rt == (struct rtentry *)0 ||
ro->ro_rt->rt_ifp == (struct ifnet *)0) {
/* No route yet, so try to acquire one */
bzero(&ro->ro_dst, sizeof(struct sockaddr_in6));
ro->ro_dst.sin6_family = AF_INET6;
ro->ro_dst.sin6_len = sizeof(struct sockaddr_in6);
ro->ro_dst.sin6_addr = *dst;
if (IN6_IS_ADDR_MULTICAST(dst)) {
ro->ro_rt = rtalloc1(&((struct route *)ro)
->ro_dst, 0);
} else {
rtalloc((struct route *)ro);
}
}
/*
* in_pcbconnect() checks out IFF_LOOPBACK to skip using
* the address. But we don't know why it does so.
* It is necessary to ensure the scope even for lo0
* so doesn't check out IFF_LOOPBACK.
*/
if (ro->ro_rt) {
ia6 = in6_ifawithscope(ro->ro_rt->rt_ifa->ifa_ifp, dst);
if (ia6 == 0) /* xxx scope error ?*/
ia6 = ifatoia6(ro->ro_rt->rt_ifa);
}
#if 0
/*
* xxx The followings are necessary? (kazu)
* I don't think so.
* It's for SO_DONTROUTE option in IPv4.(jinmei)
*/
if (ia6 == 0) {
struct sockaddr_in6 sin6 = {sizeof(sin6), AF_INET6, 0};
sin6->sin6_addr = *dst;
ia6 = ifatoia6(ifa_ifwithdstaddr(sin6tosa(&sin6)));
if (ia6 == 0)
ia6 = ifatoia6(ifa_ifwithnet(sin6tosa(&sin6)));
if (ia6 == 0)
return(0);
return(&satosin6(&ia6->ia_addr)->sin6_addr);
}
#endif /* 0 */
if (ia6 == 0) {
*errorp = EHOSTUNREACH; /* no route */
return(0);
}
return(&satosin6(&ia6->ia_addr)->sin6_addr);
}
*errorp = EADDRNOTAVAIL;
return(0);
}
/*
* Default hop limit selection. The precedence is as follows:
* 1. Hoplimit valued specified via ioctl.
* 2. (If the outgoing interface is detected) the current
* hop limit of the interface specified by router advertisement.
* 3. The system default hoplimit.
*/
int
in6_selecthlim(in6p, ifp)
struct in6pcb *in6p;
struct ifnet *ifp;
{
if (in6p && in6p->in6p_hops >= 0)
return(in6p->in6p_hops);
else if (ifp)
return(nd_ifinfo[ifp->if_index].chlim);
else
return(ip6_defhlim);
}
void
in6_pcbdisconnect(in6p)
struct in6pcb *in6p;
{
bzero((caddr_t)&in6p->in6p_faddr, sizeof(in6p->in6p_faddr));
in6p->in6p_fport = 0;
if (in6p->in6p_socket->so_state & SS_NOFDREF)
in6_pcbdetach(in6p);
}
void
in6_pcbdetach(in6p)
struct in6pcb *in6p;
{
struct socket *so = in6p->in6p_socket;
#ifdef IPSEC
ipsec6_delete_pcbpolicy(in6p);
#endif /* IPSEC */
sotoin6pcb(so) = 0;
sofree(so);
if (in6p->in6p_options)
m_freem(in6p->in6p_options);
if (in6p->in6p_outputopts) {
if (in6p->in6p_outputopts->ip6po_rthdr &&
in6p->in6p_outputopts->ip6po_route.ro_rt)
RTFREE(in6p->in6p_outputopts->ip6po_route.ro_rt);
if (in6p->in6p_outputopts->ip6po_m)
(void)m_free(in6p->in6p_outputopts->ip6po_m);
free(in6p->in6p_outputopts, M_IP6OPT);
}
if (in6p->in6p_route.ro_rt)
rtfree(in6p->in6p_route.ro_rt);
ip6_freemoptions(in6p->in6p_moptions);
in6p->in6p_next->in6p_prev = in6p->in6p_prev;
in6p->in6p_prev->in6p_next = in6p->in6p_next;
in6p->in6p_prev = NULL;
FREE(in6p, M_PCB);
}
void
in6_setsockaddr(in6p, nam)
struct in6pcb *in6p;
struct mbuf *nam;
{
struct sockaddr_in6 *sin6;
nam->m_len = sizeof(*sin6);
sin6 = mtod(nam, struct sockaddr_in6 *);
bzero((caddr_t)sin6, sizeof(*sin6));
sin6->sin6_family = AF_INET6;
sin6->sin6_len = sizeof(struct sockaddr_in6);
sin6->sin6_port = in6p->in6p_lport;
sin6->sin6_addr = in6p->in6p_laddr;
if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]);
else
sin6->sin6_scope_id = 0; /*XXX*/
if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
sin6->sin6_addr.s6_addr16[1] = 0;
}
void
in6_setpeeraddr(in6p, nam)
struct in6pcb *in6p;
struct mbuf *nam;
{
struct sockaddr_in6 *sin6;
nam->m_len = sizeof(*sin6);
sin6 = mtod(nam, struct sockaddr_in6 *);
bzero((caddr_t)sin6, sizeof(*sin6));
sin6->sin6_family = AF_INET6;
sin6->sin6_len = sizeof(struct sockaddr_in6);
sin6->sin6_port = in6p->in6p_fport;
sin6->sin6_addr = in6p->in6p_faddr;
if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]);
else
sin6->sin6_scope_id = 0; /*XXX*/
if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
sin6->sin6_addr.s6_addr16[1] = 0;
}
/*
* Pass some notification to all connections of a protocol
* associated with address dst. The local address and/or port numbers
* may be specified to limit the search. The "usual action" will be
* taken, depending on the ctlinput cmd. The caller must filter any
* cmds that are uninteresting (e.g., no error in the map).
* Call the protocol specific routine (if any) to report
* any errors for each matching socket.
*
* Must be called at splsoftnet.
*/
int
in6_pcbnotify(head, dst, fport_arg, laddr6, lport_arg, cmd, notify)
struct in6pcb *head;
struct sockaddr *dst;
u_int fport_arg, lport_arg;
struct in6_addr *laddr6;
int cmd;
void (*notify) __P((struct in6pcb *, int));
{
struct in6pcb *in6p, *oin6p;
struct in6_addr faddr6;
u_int16_t fport = fport_arg, lport = lport_arg;
int errno;
int nmatch = 0;
if ((unsigned)cmd > PRC_NCMDS || dst->sa_family != AF_INET6)
return 0;
faddr6 = ((struct sockaddr_in6 *)dst)->sin6_addr;
if (IN6_IS_ADDR_UNSPECIFIED(&faddr6))
return 0;
/*
* Redirects go to all references to the destination,
* and use in_rtchange to invalidate the route cache.
* Dead host indications: notify all references to the destination.
* Otherwise, if we have knowledge of the local port and address,
* deliver only to that socket.
*/
if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
fport = 0;
lport = 0;
bzero((caddr_t)laddr6, sizeof(*laddr6));
if (cmd != PRC_HOSTDEAD)
notify = in6_rtchange;
}
if (notify == NULL)
return 0;
errno = inet6ctlerrmap[cmd];
for (in6p = head->in6p_next; in6p != head;) {
if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,&faddr6) ||
in6p->in6p_socket == 0 ||
(lport && in6p->in6p_lport != lport) ||
(!IN6_IS_ADDR_UNSPECIFIED(laddr6) &&
!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, laddr6)) ||
(fport && in6p->in6p_fport != fport)) {
in6p = in6p->in6p_next;
continue;
}
oin6p = in6p;
in6p = in6p->in6p_next;
(*notify)(oin6p, errno);
nmatch++;
}
return nmatch;
}
void
in6_pcbpurgeif(head, ifp)
struct in6pcb *head;
struct ifnet *ifp;
{
struct in6pcb *in6p, *nin6p;
for (in6p = head->in6p_next; in6p != head; in6p = nin6p) {
nin6p = in6p->in6p_next;
if (in6p->in6p_route.ro_rt != NULL &&
in6p->in6p_route.ro_rt->rt_ifp == ifp)
in6_rtchange(in6p, 0);
}
}
/*
* Check for alternatives when higher level complains
* about service problems. For now, invalidate cached
* routing information. If the route was created dynamically
* (by a redirect), time to try a default gateway again.
*/
void
in6_losing(in6p)
struct in6pcb *in6p;
{
struct rtentry *rt;
struct rt_addrinfo info;
if ((rt = in6p->in6p_route.ro_rt) != NULL) {
in6p->in6p_route.ro_rt = 0;
bzero((caddr_t)&info, sizeof(info));
info.rti_info[RTAX_DST] =
(struct sockaddr *)&in6p->in6p_route.ro_dst;
info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
info.rti_info[RTAX_NETMASK] = rt_mask(rt);
rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0);
if (rt->rt_flags & RTF_DYNAMIC)
(void)rtrequest(RTM_DELETE, rt_key(rt),
rt->rt_gateway, rt_mask(rt), rt->rt_flags,
(struct rtentry **)0);
else
/*
* A new route can be allocated
* the next time output is attempted.
*/
rtfree(rt);
}
}
/*
* After a routing change, flush old routing
* and allocate a (hopefully) better one.
*/
void
in6_rtchange(in6p, errno)
struct in6pcb *in6p;
int errno;
{
if (in6p->in6p_route.ro_rt) {
rtfree(in6p->in6p_route.ro_rt);
in6p->in6p_route.ro_rt = 0;
/*
* A new route can be allocated the next time
* output is attempted.
*/
}
}
struct in6pcb *
in6_pcblookup(head, faddr6, fport_arg, laddr6, lport_arg, flags)
struct in6pcb *head;
struct in6_addr *faddr6, *laddr6;
u_int fport_arg, lport_arg;
int flags;
{
struct in6pcb *in6p, *match = 0;
int matchwild = 3, wildcard;
u_int16_t fport = fport_arg, lport = lport_arg;
for (in6p = head->in6p_next; in6p != head; in6p = in6p->in6p_next) {
if (in6p->in6p_lport != lport)
continue;
wildcard = 0;
if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
if (IN6_IS_ADDR_UNSPECIFIED(laddr6))
wildcard++;
else if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, laddr6))
continue;
}
#ifndef TCP6
else if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr)
&& in6p->in6p_laddr.s6_addr32[3] == 0) {
if (!IN6_IS_ADDR_V4MAPPED(laddr6))
continue;
if (laddr6->s6_addr32[3] == 0)
;
else
wildcard++;
}
#endif
else {
if (IN6_IS_ADDR_V4MAPPED(laddr6)) {
#if !defined(TCP6) && !defined(INET6_BINDV6ONLY)
if (in6p->in6p_flags & IN6P_BINDV6ONLY)
continue;
else
wildcard++;
#else
continue;
#endif
} else if (!IN6_IS_ADDR_UNSPECIFIED(laddr6))
wildcard++;
}
if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
if (IN6_IS_ADDR_UNSPECIFIED(faddr6))
wildcard++;
else if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, faddr6)
|| in6p->in6p_fport != fport)
continue;
}
#ifndef TCP6
else if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)
&& in6p->in6p_faddr.s6_addr32[3] == 0) {
if (!IN6_IS_ADDR_V4MAPPED(faddr6))
continue;
if (faddr6->s6_addr32[3] == 0)
;
else
wildcard++;
}
#endif
else {
if (IN6_IS_ADDR_V4MAPPED(faddr6)) {
#if !defined(TCP6) && !defined(INET6_BINDV6ONLY)
if (in6p->in6p_flags & IN6P_BINDV6ONLY)
continue;
else
wildcard++;
#else
continue;
#endif
} else if (!IN6_IS_ADDR_UNSPECIFIED(faddr6))
wildcard++;
}
if (wildcard && (flags & IN6PLOOKUP_WILDCARD) == 0)
continue;
if (wildcard < matchwild) {
match = in6p;
matchwild = wildcard;
if (matchwild == 0)
break;
}
}
return(match);
}
#ifndef TCP6
struct rtentry *
in6_pcbrtentry(in6p)
struct in6pcb *in6p;
{
struct route_in6 *ro;
ro = &in6p->in6p_route;
if (ro->ro_rt == NULL) {
/*
* No route yet, so try to acquire one.
*/
if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
bzero(&ro->ro_dst, sizeof(ro->ro_dst));
ro->ro_dst.sin6_family = AF_INET6;
ro->ro_dst.sin6_len = sizeof(struct sockaddr_in6);
satosin6(&ro->ro_dst)->sin6_addr = in6p->in6p_faddr;
rtalloc((struct route *)ro);
}
}
return (ro->ro_rt);
}
struct in6pcb *
in6_pcblookup_connect(head, faddr6, fport_arg, laddr6, lport_arg, faith)
struct in6pcb *head;
struct in6_addr *faddr6, *laddr6;
u_int fport_arg, lport_arg;
int faith;
{
struct in6pcb *in6p;
u_int16_t fport = fport_arg, lport = lport_arg;
for (in6p = head->in6p_next; in6p != head; in6p = in6p->in6p_next) {
#if defined(NFAITH) && NFAITH > 0
if (faith && (in6p->in6p_flags & IN6P_FAITH) == 0)
continue;
#endif
/* find exact match on both source and dest */
if (in6p->in6p_fport != fport)
continue;
if (in6p->in6p_lport != lport)
continue;
if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr))
continue;
if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, faddr6))
continue;
if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr))
continue;
if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, laddr6))
continue;
return in6p;
}
return NULL;
}
struct in6pcb *
in6_pcblookup_bind(head, laddr6, lport_arg, faith)
struct in6pcb *head;
struct in6_addr *laddr6;
u_int lport_arg;
int faith;
{
struct in6pcb *in6p, *match;
u_int16_t lport = lport_arg;
match = NULL;
for (in6p = head->in6p_next; in6p != head; in6p = in6p->in6p_next) {
/*
* find destination match. exact match is preferred
* against wildcard match.
*/
#if defined(NFAITH) && NFAITH > 0
if (faith && (in6p->in6p_flags & IN6P_FAITH) == 0)
continue;
#endif
if (in6p->in6p_fport != 0)
continue;
if (in6p->in6p_lport != lport)
continue;
if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
if (IN6_IS_ADDR_V4MAPPED(laddr6)) {
#ifndef INET6_BINDV6ONLY
if (in6p->in6p_flags & IN6P_BINDV6ONLY)
continue;
else
match = in6p;
#else
continue;
#endif
} else
match = in6p;
}
else if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr) &&
in6p->in6p_laddr.s6_addr32[3] == 0) {
if (IN6_IS_ADDR_V4MAPPED(laddr6)
&& laddr6->s6_addr32[3] != 0)
match = in6p;
}
else if (IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, laddr6))
return in6p;
}
return match;
}
#endif
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