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NetBSD/sys/netinet6/in6_pcb.c
itojun 9ccf08b3c5 netbsd; on interface removal, force pcbs to leave from multicast groups 
pointing toward the interface about to be removed.  sync with kame
XXX still need more discussions on semantics.  the behavior should be safer
2001-06-27 15:53:14 +00:00

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/* $NetBSD: in6_pcb.c,v 1.37 2001/06/27 15:53:14 itojun Exp $ */
/* $KAME: in6_pcb.c,v 1.84 2001/02/08 18:02:08 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 <netinet/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>
#endif /* IPSEC */
struct in6_addr zeroin6_addr;
int ip6_anonportmin = IPV6PORT_ANONMIN;
int ip6_anonportmax = IPV6PORT_ANONMAX;
int ip6_lowportmin = IPV6PORT_RESERVEDMIN;
int ip6_lowportmax = IPV6PORT_RESERVEDMAX;
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, p)
struct in6pcb *in6p;
struct mbuf *nam;
struct proc *p;
{
struct socket *so = in6p->in6p_socket;
struct in6pcb *head = in6p->in6p_head;
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL;
u_int16_t lport = 0;
int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
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);
/*
* since we do not check port number duplicate with IPv4 space,
* we reject it at this moment. If we leave it, we make normal
* user to hijack port number from other users.
*/
if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
return(EADDRNOTAVAIL);
/* KAME hack: embed scopeid */
if (in6_embedscope(&sin6->sin6_addr, sin6, in6p, NULL) != 0)
return EINVAL;
/* 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 ((in6p->in6p_flags & IN6P_FAITH) == 0 &&
(ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0)
return(EADDRNOTAVAIL);
/*
* XXX: bind to an anycast address might accidentally
* cause sending a packet with anycast source address.
*/
if (ia &&
((struct in6_ifaddr *)ia)->ia6_flags &
(IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
return(EADDRNOTAVAIL);
}
}
if (lport) {
#ifndef IPNOPRIVPORTS
int priv;
/*
* NOTE: all operating systems use suser() for
* privilege check! do not rewrite it into SS_PRIV.
*/
priv = (p && !suser(p->p_ucred, &p->p_acflag)) ? 1 : 0;
/* GROSS */
if (ntohs(lport) < IPV6PORT_RESERVED && !priv)
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);
}
/*
* 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 ifnet *ifp = NULL; /* outgoing interface */
int error = 0;
#ifdef INET
struct in6_addr mapped;
#endif
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);
/* 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;
}
/* protect *sin6 from overwrites */
tmp = *sin6;
sin6 = &tmp;
/* KAME hack: embed scopeid */
if (in6_embedscope(&sin6->sin6_addr, sin6, in6p, &ifp) != 0)
return EINVAL;
/* 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, (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
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, &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,
(struct proc *)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);
}
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;
/* KAME hack: recover scopeid */
(void)in6_recoverscope(sin6, &in6p->in6p_laddr, NULL);
}
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;
/* KAME hack: recover scopeid */
(void)in6_recoverscope(sin6, &in6p->in6p_faddr, NULL);
}
/*
* 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.
*
* Note: src (4th arg) carries the flowlabel value on the original IPv6
* header, in sin6_flowinfo member.
*/
int
in6_pcbnotify(head, dst, fport_arg, src, lport_arg, cmd, cmdarg, notify)
struct in6pcb *head;
struct sockaddr *dst, *src;
u_int fport_arg, lport_arg;
int cmd;
void *cmdarg;
void (*notify) __P((struct in6pcb *, int));
{
struct in6pcb *in6p, *nin6p;
struct sockaddr_in6 sa6_src, *sa6_dst;
u_int16_t fport = fport_arg, lport = lport_arg;
int errno;
int nmatch = 0;
u_int32_t flowinfo;
if ((unsigned)cmd > PRC_NCMDS || dst->sa_family != AF_INET6)
return 0;
sa6_dst = (struct sockaddr_in6 *)dst;
if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr))
return 0;
/*
* note that src can be NULL when we get notify by local fragmentation.
*/
sa6_src = (src == NULL) ? sa6_any : *(struct sockaddr_in6 *)src;
flowinfo = sa6_src.sin6_flowinfo;
/*
* Redirects go to all references to the destination,
* and use in6_rtchange to invalidate the route cache.
* Dead host indications: also use in6_rtchange to invalidate
* the cache, and deliver the error to all the sockets.
* 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)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr));
if (cmd != PRC_HOSTDEAD)
notify = in6_rtchange;
}
errno = inet6ctlerrmap[cmd];
for (in6p = head->in6p_next; in6p != head; in6p = nin6p) {
nin6p = in6p->in6p_next;
/*
* Under the following condition, notify of redirects
* to the pcb, without making address matches against inpcb.
* - redirect notification is arrived.
* - the inpcb is unconnected.
* - the inpcb is caching !RTF_HOST routing entry.
* - the ICMPv6 notification is from the gateway cached in the
* inpcb. i.e. ICMPv6 notification is from nexthop gateway
* the inpcb used very recently.
*
* This is to improve interaction between netbsd/openbsd
* redirect handling code, and inpcb route cache code.
* without the clause, !RTF_HOST routing entry (which carries
* gateway used by inpcb right before the ICMPv6 redirect)
* will be cached forever in unconnected inpcb.
*
* There still is a question regarding to what is TRT:
* - On bsdi/freebsd, RTF_HOST (cloned) routing entry will be
* generated on packet output. inpcb will always cache
* RTF_HOST routing entry so there's no need for the clause
* (ICMPv6 redirect will update RTF_HOST routing entry,
* and inpcb is caching it already).
* However, bsdi/freebsd are vulnerable to local DoS attacks
* due to the cloned routing entries.
* - Specwise, "destination cache" is mentioned in RFC2461.
* Jinmei says that it implies bsdi/freebsd behavior, itojun
* is not really convinced.
* - Having hiwat/lowat on # of cloned host route (redirect/
* pmtud) may be a good idea. netbsd/openbsd has it. see
* icmp6_mtudisc_update().
*/
if ((PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) &&
IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
in6p->in6p_route.ro_rt &&
!(in6p->in6p_route.ro_rt->rt_flags & RTF_HOST)) {
struct sockaddr_in6 *dst6;
dst6 = (struct sockaddr_in6 *)&in6p->in6p_route.ro_dst;
if (IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr,
&sa6_dst->sin6_addr))
goto do_notify;
}
/*
* Detect if we should notify the error. If no source and
* destination ports are specifed, but non-zero flowinfo and
* local address match, notify the error. This is the case
* when the error is delivered with an encrypted buffer
* by ESP. Otherwise, just compare addresses and ports
* as usual.
*/
if (lport == 0 && fport == 0 && flowinfo &&
in6p->in6p_socket != NULL &&
flowinfo == (in6p->in6p_flowinfo & IPV6_FLOWLABEL_MASK) &&
IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &sa6_src.sin6_addr))
goto do_notify;
else if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
&sa6_dst->sin6_addr) ||
in6p->in6p_socket == 0 ||
(lport && in6p->in6p_lport != lport) ||
(!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) &&
!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
&sa6_src.sin6_addr)) ||
(fport && in6p->in6p_fport != fport))
continue;
do_notify:
if (notify)
(*notify)(in6p, errno);
nmatch++;
}
return nmatch;
}
void
in6_pcbpurgeif(head, ifp)
struct in6pcb *head;
struct ifnet *ifp;
{
struct in6pcb *in6p, *nin6p;
struct ip6_moptions *im6o;
struct in6_multi_mship *imm, *nimm;
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);
im6o = in6p->in6p_moptions;
if (im6o) {
/*
* Unselect the outgoing interface if it is being
* detached.
*/
if (im6o->im6o_multicast_ifp == ifp)
im6o->im6o_multicast_ifp = NULL;
/*
* Drop multicast group membership if we joined
* through the interface being detached.
* XXX controversial - is it really legal for kernel
* to force this?
*/
for (imm = im6o->im6o_memberships.lh_first;
imm != NULL; imm = nimm) {
nimm = imm->i6mm_chain.le_next;
if (imm->i6mm_maddr->in6m_ifp == ifp) {
LIST_REMOVE(imm, i6mm_chain);
in6_delmulti(imm->i6mm_maddr);
free(imm, M_IPMADDR);
}
}
}
}
}
/*
* 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;
}
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++;
}
else {
if (IN6_IS_ADDR_V4MAPPED(laddr6)) {
#ifndef 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;
}
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++;
}
else {
if (IN6_IS_ADDR_V4MAPPED(faddr6)) {
#ifndef 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);
}
struct rtentry *
in6_pcbrtentry(in6p)
struct in6pcb *in6p;
{
struct route_in6 *ro;
struct sockaddr_in6 *dst6;
ro = &in6p->in6p_route;
dst6 = (struct sockaddr_in6 *)&ro->ro_dst;
if (ro->ro_rt == NULL) {
/*
* No route yet, so try to acquire one.
*/
if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
bzero(dst6, sizeof(*dst6));
dst6->sin6_family = AF_INET6;
dst6->sin6_len = sizeof(struct sockaddr_in6);
dst6->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) {
/* 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 (faith && (in6p->in6p_flags & IN6P_FAITH) == 0)
continue;
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;
}
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