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in6_pcb.c
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in6_pcb.c
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/* $NetBSD: in6_pcb.c,v 1.90 2007/11/21 21:18:25 drochner 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. 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 <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: in6_pcb.c,v 1.90 2007/11/21 21:18:25 drochner Exp $");
#include "opt_inet.h"
#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 <sys/kauth.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/scope6_var.h>
#include <netinet6/nd6.h>
#include "faith.h"
#ifdef IPSEC
#include <netinet6/ipsec.h>
#include <netkey/key.h>
#endif /* IPSEC */
#ifdef FAST_IPSEC
#include <netipsec/ipsec.h>
#include <netipsec/ipsec6.h>
#include <netipsec/key.h>
#endif /* FAST_IPSEC */
struct in6_addr zeroin6_addr;
#define IN6PCBHASH_PORT(table, lport) \
&(table)->inpt_porthashtbl[ntohs(lport) & (table)->inpt_porthash]
#define IN6PCBHASH_BIND(table, laddr, lport) \
&(table)->inpt_bindhashtbl[ \
(((laddr)->s6_addr32[0] ^ (laddr)->s6_addr32[1] ^ \
(laddr)->s6_addr32[2] ^ (laddr)->s6_addr32[3]) + ntohs(lport)) & \
(table)->inpt_bindhash]
#define IN6PCBHASH_CONNECT(table, faddr, fport, laddr, lport) \
&(table)->inpt_bindhashtbl[ \
((((faddr)->s6_addr32[0] ^ (faddr)->s6_addr32[1] ^ \
(faddr)->s6_addr32[2] ^ (faddr)->s6_addr32[3]) + ntohs(fport)) + \
(((laddr)->s6_addr32[0] ^ (laddr)->s6_addr32[1] ^ \
(laddr)->s6_addr32[2] ^ (laddr)->s6_addr32[3]) + \
ntohs(lport))) & (table)->inpt_bindhash]
int ip6_anonportmin = IPV6PORT_ANONMIN;
int ip6_anonportmax = IPV6PORT_ANONMAX;
int ip6_lowportmin = IPV6PORT_RESERVEDMIN;
int ip6_lowportmax = IPV6PORT_RESERVEDMAX;
POOL_INIT(in6pcb_pool, sizeof(struct in6pcb), 0, 0, 0, "in6pcbpl", NULL,
IPL_SOFTNET);
void
in6_pcbinit(struct inpcbtable *table, int bindhashsize, int connecthashsize)
{
in_pcbinit(table, bindhashsize, connecthashsize);
table->inpt_lastport = (u_int16_t)ip6_anonportmax;
}
int
in6_pcballoc(struct socket *so, void *v)
{
struct inpcbtable *table = v;
struct in6pcb *in6p;
int s;
#if defined(IPSEC) || defined(FAST_IPSEC)
int error;
#endif
s = splnet();
in6p = pool_get(&in6pcb_pool, PR_NOWAIT);
splx(s);
if (in6p == NULL)
return (ENOBUFS);
bzero((void *)in6p, sizeof(*in6p));
in6p->in6p_af = AF_INET6;
in6p->in6p_table = table;
in6p->in6p_socket = so;
in6p->in6p_hops = -1; /* use kernel default */
in6p->in6p_icmp6filt = NULL;
#if defined(IPSEC) || defined(FAST_IPSEC)
error = ipsec_init_pcbpolicy(so, &in6p->in6p_sp);
if (error != 0) {
s = splnet();
pool_put(&in6pcb_pool, in6p);
splx(s);
return error;
}
#endif /* IPSEC */
s = splnet();
CIRCLEQ_INSERT_HEAD(&table->inpt_queue, (struct inpcb_hdr*)in6p,
inph_queue);
LIST_INSERT_HEAD(IN6PCBHASH_PORT(table, in6p->in6p_lport),
&in6p->in6p_head, inph_lhash);
in6_pcbstate(in6p, IN6P_ATTACHED);
splx(s);
if (ip6_v6only)
in6p->in6p_flags |= IN6P_IPV6_V6ONLY;
so->so_pcb = (void *)in6p;
return (0);
}
int
in6_pcbbind(void *v, struct mbuf *nam, struct lwp *l)
{
struct in6pcb *in6p = v;
struct socket *so = in6p->in6p_socket;
struct inpcbtable *table = in6p->in6p_table;
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_af != AF_INET6)
return (EINVAL);
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 = 1;
if (nam) {
int error;
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);
#ifndef INET
if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
return (EADDRNOTAVAIL);
#endif
if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0)
return (error);
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)) {
if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0)
return (EINVAL);
if (sin6->sin6_addr.s6_addr32[3]) {
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);
/*
* bind to an anycast address might accidentally
* cause sending a packet with an anycast source
* address, so we forbid it.
*
* We should allow to bind to a deprecated address,
* since the application dare to use it.
* But, can we assume that they are careful enough
* to check if the address is deprecated or not?
* Maybe, as a safeguard, we should have a setsockopt
* flag to control the bind(2) behavior against
* deprecated addresses (default: forbid bind(2)).
*/
if (ia &&
((struct in6_ifaddr *)ia)->ia6_flags &
(IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED))
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 = (l && !kauth_authorize_generic(l->l_cred,
KAUTH_GENERIC_ISSUSER, NULL)) ? 1 : 0;
/* GROSS */
if (ntohs(lport) < IPV6PORT_RESERVED && !priv)
return (EACCES);
#endif
if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
#ifdef INET
struct inpcb *t;
t = in_pcblookup_port(table,
*(struct in_addr *)&sin6->sin6_addr.s6_addr32[3],
lport, wild);
if (t && (reuseport & t->inp_socket->so_options) == 0)
return (EADDRINUSE);
#else
return (EADDRNOTAVAIL);
#endif
}
{
struct in6pcb *t;
t = in6_pcblookup_port(table, &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;
e = in6_pcbsetport(&in6p->in6p_laddr, in6p, l);
if (e != 0)
return (e);
} else {
in6p->in6p_lport = lport;
in6_pcbstate(in6p, IN6P_BOUND);
}
LIST_REMOVE(&in6p->in6p_head, inph_lhash);
LIST_INSERT_HEAD(IN6PCBHASH_PORT(table, in6p->in6p_lport),
&in6p->in6p_head, inph_lhash);
#if 0
in6p->in6p_flowinfo = 0; /* XXX */
#endif
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 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 && in6p->in6p_route.ro_rt != NULL)
ifp = in6p->in6p_route.ro_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);
}
void
in6_pcbdisconnect(struct in6pcb *in6p)
{
bzero((void *)&in6p->in6p_faddr, sizeof(in6p->in6p_faddr));
in6p->in6p_fport = 0;
in6_pcbstate(in6p, IN6P_BOUND);
in6p->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
#if defined(IPSEC) || defined(FAST_IPSEC)
ipsec_pcbdisconn(in6p->in6p_sp);
#endif
if (in6p->in6p_socket->so_state & SS_NOFDREF)
in6_pcbdetach(in6p);
}
void
in6_pcbdetach(struct in6pcb *in6p)
{
struct socket *so = in6p->in6p_socket;
int s;
if (in6p->in6p_af != AF_INET6)
return;
#if defined(IPSEC) || defined(FAST_IPSEC)
ipsec6_delete_pcbpolicy(in6p);
#endif /* IPSEC */
so->so_pcb = 0;
sofree(so);
if (in6p->in6p_options)
m_freem(in6p->in6p_options);
if (in6p->in6p_outputopts) {
if (in6p->in6p_outputopts->ip6po_rthdr != NULL)
rtcache_free(&in6p->in6p_outputopts->ip6po_route);
if (in6p->in6p_outputopts->ip6po_m)
(void)m_free(in6p->in6p_outputopts->ip6po_m);
free(in6p->in6p_outputopts, M_IP6OPT);
}
rtcache_free(&in6p->in6p_route);
ip6_freemoptions(in6p->in6p_moptions);
s = splnet();
in6_pcbstate(in6p, IN6P_ATTACHED);
LIST_REMOVE(&in6p->in6p_head, inph_lhash);
CIRCLEQ_REMOVE(&in6p->in6p_table->inpt_queue, &in6p->in6p_head,
inph_queue);
pool_put(&in6pcb_pool, in6p);
splx(s);
}
void
in6_setsockaddr(struct in6pcb *in6p, struct mbuf *nam)
{
struct sockaddr_in6 *sin6;
if (in6p->in6p_af != AF_INET6)
return;
nam->m_len = sizeof(*sin6);
sin6 = mtod(nam, struct sockaddr_in6 *);
sockaddr_in6_init(sin6, &in6p->in6p_laddr, in6p->in6p_lport, 0, 0);
(void)sa6_recoverscope(sin6); /* XXX: should catch errors */
}
void
in6_setpeeraddr(struct in6pcb *in6p, struct mbuf *nam)
{
struct sockaddr_in6 *sin6;
if (in6p->in6p_af != AF_INET6)
return;
nam->m_len = sizeof(*sin6);
sin6 = mtod(nam, struct sockaddr_in6 *);
sockaddr_in6_init(sin6, &in6p->in6p_faddr, in6p->in6p_fport, 0, 0);
(void)sa6_recoverscope(sin6); /* XXX: should catch errors */
}
/*
* 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(struct inpcbtable *table, const struct sockaddr *dst,
u_int fport_arg, const struct sockaddr *src, u_int lport_arg, int cmd,
void *cmdarg, void (*notify)(struct in6pcb *, int))
{
struct in6pcb *in6p, *nin6p;
struct sockaddr_in6 sa6_src;
const struct sockaddr_in6 *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 = (const 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 : *(const 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((void *)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr));
if (cmd != PRC_HOSTDEAD)
notify = in6_rtchange;
}
errno = inet6ctlerrmap[cmd];
for (in6p = (struct in6pcb *)CIRCLEQ_FIRST(&table->inpt_queue);
in6p != (void *)&table->inpt_queue;
in6p = nin6p) {
nin6p = (struct in6pcb *)CIRCLEQ_NEXT(in6p, in6p_queue);
if (in6p->in6p_af != AF_INET6)
continue;
/*
* 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 != NULL &&
!(in6p->in6p_route.ro_rt->rt_flags & RTF_HOST)) {
const struct sockaddr_in6 *dst6;
dst6 = (const struct sockaddr_in6 *)
rtcache_getdst(&in6p->in6p_route);
if (dst6 == NULL)
;
else if (IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr,
&sa6_dst->sin6_addr))
goto do_notify;
}
/*
* If the error designates a new path MTU for a destination
* and the application (associated with this socket) wanted to
* know the value, notify. Note that we notify for all
* disconnected sockets if the corresponding application
* wanted. This is because some UDP applications keep sending
* sockets disconnected.
* XXX: should we avoid to notify the value to TCP sockets?
*/
if (cmd == PRC_MSGSIZE && (in6p->in6p_flags & IN6P_MTU) != 0 &&
(IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) ||
IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &sa6_dst->sin6_addr))) {
ip6_notify_pmtu(in6p, (const struct sockaddr_in6 *)dst,
(u_int32_t *)cmdarg);
}
/*
* Detect if we should notify the error. If no source and
* destination ports are specified, 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_pcbpurgeif0(struct inpcbtable *table, struct ifnet *ifp)
{
struct in6pcb *in6p, *nin6p;
struct ip6_moptions *im6o;
struct in6_multi_mship *imm, *nimm;
for (in6p = (struct in6pcb *)CIRCLEQ_FIRST(&table->inpt_queue);
in6p != (void *)&table->inpt_queue;
in6p = nin6p) {
nin6p = (struct in6pcb *)CIRCLEQ_NEXT(in6p, in6p_queue);
if (in6p->in6p_af != AF_INET6)
continue;
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_leavegroup(imm);
}
}
}
}
}
void
in6_pcbpurgeif(struct inpcbtable *table, struct ifnet *ifp)
{
struct in6pcb *in6p, *nin6p;
for (in6p = (struct in6pcb *)CIRCLEQ_FIRST(&table->inpt_queue);
in6p != (void *)&table->inpt_queue;
in6p = nin6p) {
nin6p = (struct in6pcb *)CIRCLEQ_NEXT(in6p, in6p_queue);
if (in6p->in6p_af != AF_INET6)
continue;
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(struct in6pcb *in6p)
{
struct rtentry *rt;
struct rt_addrinfo info;
if (in6p->in6p_af != AF_INET6)
return;
if ((rt = in6p->in6p_route.ro_rt) != NULL) {
memset(&info, 0, sizeof(info));
info.rti_info[RTAX_DST] = rtcache_getdst(&in6p->in6p_route);
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_getkey(rt),
rt->rt_gateway, rt_mask(rt), rt->rt_flags, NULL);
}
rtcache_free(&in6p->in6p_route);
/*
* A new route can be allocated
* the next time output is attempted.
*/
}
}
/*
* After a routing change, flush old routing. A new route can be
* allocated the next time output is attempted.
*/
void
in6_rtchange(struct in6pcb *in6p, int errno)
{
if (in6p->in6p_af != AF_INET6)
return;
rtcache_free(&in6p->in6p_route);
/*
* A new route can be allocated the next time
* output is attempted.
*/
}
struct in6pcb *
in6_pcblookup_port(struct inpcbtable *table, struct in6_addr *laddr6,
u_int lport_arg, int lookup_wildcard)
{
struct inpcbhead *head;
struct inpcb_hdr *inph;
struct in6pcb *in6p, *match = 0;
int matchwild = 3, wildcard;
u_int16_t lport = lport_arg;
head = IN6PCBHASH_PORT(table, lport);
LIST_FOREACH(inph, head, inph_lhash) {
in6p = (struct in6pcb *)inph;
if (in6p->in6p_af != AF_INET6)
continue;
if (in6p->in6p_lport != lport)
continue;
wildcard = 0;
if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) {
if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0)
continue;
}
if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr))
wildcard++;
if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr)) {
if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0)
continue;
if (!IN6_IS_ADDR_V4MAPPED(laddr6))
continue;
/* duplicate of IPv4 logic */
wildcard = 0;
if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr) &&
in6p->in6p_faddr.s6_addr32[3])
wildcard++;
if (!in6p->in6p_laddr.s6_addr32[3]) {
if (laddr6->s6_addr32[3])
wildcard++;
} else {
if (!laddr6->s6_addr32[3])
wildcard++;
else {
if (in6p->in6p_laddr.s6_addr32[3] !=
laddr6->s6_addr32[3])
continue;
}
}
} else if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
if (IN6_IS_ADDR_V4MAPPED(laddr6)) {
if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0)
continue;
}
if (!IN6_IS_ADDR_UNSPECIFIED(laddr6))
wildcard++;
} else {
if (IN6_IS_ADDR_V4MAPPED(laddr6)) {
if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0)
continue;
}
if (IN6_IS_ADDR_UNSPECIFIED(laddr6))
wildcard++;
else {
if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
laddr6))
continue;
}
}
if (wildcard && !lookup_wildcard)
continue;
if (wildcard < matchwild) {
match = in6p;
matchwild = wildcard;
if (matchwild == 0)
break;
}
}
return (match);
}
#undef continue
/*
* WARNING: return value (rtentry) could be IPv4 one if in6pcb is connected to
* IPv4 mapped address.
*/
struct rtentry *
in6_pcbrtentry(struct in6pcb *in6p)
{
struct route *ro;
union {
const struct sockaddr *sa;
const struct sockaddr_in6 *sa6;
#ifdef INET
const struct sockaddr_in *sa4;
#endif
} cdst;
ro = &in6p->in6p_route;
if (in6p->in6p_af != AF_INET6)
return (NULL);
cdst.sa = rtcache_getdst(ro);
if (cdst.sa == NULL)
;
#ifdef INET
else if (cdst.sa->sa_family == AF_INET) {
KASSERT(IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr));
if (cdst.sa4->sin_addr.s_addr != in6p->in6p_faddr.s6_addr32[3])
rtcache_free(ro);
else
rtcache_check(ro);
}
#endif
else {
if (!IN6_ARE_ADDR_EQUAL(&cdst.sa6->sin6_addr,
&in6p->in6p_faddr))
rtcache_free(ro);
else
rtcache_check(ro);
}
#ifdef INET
if (ro->ro_rt == NULL && IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) {
union {
struct sockaddr dst;
struct sockaddr_in dst4;
} u;
struct in_addr addr;
addr.s_addr = in6p->in6p_faddr.s6_addr32[3];
sockaddr_in_init(&u.dst4, &addr, 0);
rtcache_setdst(ro, &u.dst);
rtcache_init(ro);
} else
#endif
if (ro->ro_rt == NULL && !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
union {
struct sockaddr dst;
struct sockaddr_in6 dst6;
} u;
sockaddr_in6_init(&u.dst6, &in6p->in6p_faddr, 0, 0, 0);
rtcache_setdst(ro, &u.dst);
rtcache_init(ro);
}
return ro->ro_rt;
}
struct in6pcb *
in6_pcblookup_connect(struct inpcbtable *table, const struct in6_addr *faddr6,
u_int fport_arg, const struct in6_addr *laddr6, u_int lport_arg,
int faith)
{
struct inpcbhead *head;
struct inpcb_hdr *inph;
struct in6pcb *in6p;
u_int16_t fport = fport_arg, lport = lport_arg;
head = IN6PCBHASH_CONNECT(table, faddr6, fport, laddr6, lport);
LIST_FOREACH(inph, head, inph_hash) {
in6p = (struct in6pcb *)inph;
if (in6p->in6p_af != AF_INET6)
continue;
/* 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;
if ((IN6_IS_ADDR_V4MAPPED(laddr6) ||
IN6_IS_ADDR_V4MAPPED(faddr6)) &&
(in6p->in6p_flags & IN6P_IPV6_V6ONLY))
continue;