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7893235ff0
freebsd/sys/netinet6/in6_pcb.c
Gleb Smirnoff a68cc38879 Mechanical cleanup of epoch(9) usage in network stack. 
- Remove macros that covertly create epoch_tracker on thread stack. Such
  macros a quite unsafe, e.g. will produce a buggy code if same macro is
  used in embedded scopes. Explicitly declare epoch_tracker always.

- Unmask interface list IFNET_RLOCK_NOSLEEP(), interface address list
  IF_ADDR_RLOCK() and interface AF specific data IF_AFDATA_RLOCK() read
  locking macros to what they actually are - the net_epoch.
  Keeping them as is is very misleading. They all are named FOO_RLOCK(),
  while they no longer have lock semantics. Now they allow recursion and
  what's more important they now no longer guarantee protection against
  their companion WLOCK macros.
  Note: INP_HASH_RLOCK() has same problems, but not touched by this commit.

This is non functional mechanical change. The only functionally changed
functions are ni6_addrs() and ni6_store_addrs(), where we no longer enter
epoch recursively.

Discussed with:	jtl, gallatin
2019-01-09 01:11:19 +00:00

1376 lines
38 KiB
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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* Copyright (c) 2010-2011 Juniper Networks, Inc.
* All rights reserved.
*
* Portions of this software were developed by Robert N. M. Watson under
* contract to Juniper Networks, Inc.
*
* 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.
*
* $KAME: in6_pcb.c,v 1.31 2001/05/21 05:45:10 jinmei Exp $
*/
/*-
* 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>
__FBSDID("$FreeBSD$");
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_ipsec.h"
#include "opt_pcbgroup.h"
#include "opt_rss.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sockio.h>
#include <sys/errno.h>
#include <sys/time.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/jail.h>
#include <vm/uma.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_llatbl.h>
#include <net/if_types.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/in_systm.h>
#include <netinet/tcp_var.h>
#include <netinet/ip6.h>
#include <netinet/ip_var.h>
#include <netinet6/ip6_var.h>
#include <netinet6/nd6.h>
#include <netinet/in_pcb.h>
#include <netinet6/in6_pcb.h>
#include <netinet6/scope6_var.h>
static struct inpcb *in6_pcblookup_hash_locked(struct inpcbinfo *,
struct in6_addr *, u_int, struct in6_addr *, u_int, int, struct ifnet *);
int
in6_pcbbind(struct inpcb *inp, struct sockaddr *nam,
struct ucred *cred)
{
struct socket *so = inp->inp_socket;
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL;
struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
u_short lport = 0;
int error, lookupflags = 0;
int reuseport = (so->so_options & SO_REUSEPORT);
/*
* XXX: Maybe we could let SO_REUSEPORT_LB set SO_REUSEPORT bit here
* so that we don't have to add to the (already messy) code below.
*/
int reuseport_lb = (so->so_options & SO_REUSEPORT_LB);
INP_WLOCK_ASSERT(inp);
INP_HASH_WLOCK_ASSERT(pcbinfo);
if (CK_STAILQ_EMPTY(&V_in6_ifaddrhead)) /* XXX broken! */
return (EADDRNOTAVAIL);
if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
return (EINVAL);
if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT|SO_REUSEPORT_LB)) == 0)
lookupflags = INPLOOKUP_WILDCARD;
if (nam == NULL) {
if ((error = prison_local_ip6(cred, &inp->in6p_laddr,
((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0))) != 0)
return (error);
} else {
sin6 = (struct sockaddr_in6 *)nam;
if (nam->sa_len != sizeof(*sin6))
return (EINVAL);
/*
* family check.
*/
if (nam->sa_family != AF_INET6)
return (EAFNOSUPPORT);
if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
return(error);
if ((error = prison_local_ip6(cred, &sin6->sin6_addr,
((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0))) != 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|SO_REUSEPORT)) != 0)
reuseport = SO_REUSEADDR|SO_REUSEPORT;
/*
* XXX: How to deal with SO_REUSEPORT_LB here?
* Treat same as SO_REUSEPORT for now.
*/
if ((so->so_options &
(SO_REUSEADDR|SO_REUSEPORT_LB)) != 0)
reuseport_lb = SO_REUSEADDR|SO_REUSEPORT_LB;
} else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
struct epoch_tracker et;
struct ifaddr *ifa;
sin6->sin6_port = 0; /* yech... */
NET_EPOCH_ENTER(et);
if ((ifa = ifa_ifwithaddr((struct sockaddr *)sin6)) ==
NULL &&
(inp->inp_flags & INP_BINDANY) == 0) {
NET_EPOCH_EXIT(et);
return (EADDRNOTAVAIL);
}
/*
* XXX: bind to an anycast address might accidentally
* cause sending a packet with anycast source address.
* We should allow to bind to a deprecated address, since
* the application dares to use it.
*/
if (ifa != NULL &&
((struct in6_ifaddr *)ifa)->ia6_flags &
(IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) {
NET_EPOCH_EXIT(et);
return (EADDRNOTAVAIL);
}
NET_EPOCH_EXIT(et);
}
if (lport) {
struct inpcb *t;
struct tcptw *tw;
/* GROSS */
if (ntohs(lport) <= V_ipport_reservedhigh &&
ntohs(lport) >= V_ipport_reservedlow &&
priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT))
return (EACCES);
if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr) &&
priv_check_cred(inp->inp_cred, PRIV_NETINET_REUSEPORT) != 0) {
t = in6_pcblookup_local(pcbinfo,
&sin6->sin6_addr, lport,
INPLOOKUP_WILDCARD, cred);
if (t &&
((inp->inp_flags2 & INP_BINDMULTI) == 0) &&
((t->inp_flags & INP_TIMEWAIT) == 0) &&
(so->so_type != SOCK_STREAM ||
IN6_IS_ADDR_UNSPECIFIED(&t->in6p_faddr)) &&
(!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
!IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) ||
(t->inp_flags2 & INP_REUSEPORT) ||
(t->inp_flags2 & INP_REUSEPORT_LB) == 0) &&
(inp->inp_cred->cr_uid !=
t->inp_cred->cr_uid))
return (EADDRINUSE);
/*
* If the socket is a BINDMULTI socket, then
* the credentials need to match and the
* original socket also has to have been bound
* with BINDMULTI.
*/
if (t && (! in_pcbbind_check_bindmulti(inp, t)))
return (EADDRINUSE);
#ifdef INET
if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
struct sockaddr_in sin;
in6_sin6_2_sin(&sin, sin6);
t = in_pcblookup_local(pcbinfo,
sin.sin_addr, lport,
INPLOOKUP_WILDCARD, cred);
if (t &&
((inp->inp_flags2 & INP_BINDMULTI) == 0) &&
((t->inp_flags &
INP_TIMEWAIT) == 0) &&
(so->so_type != SOCK_STREAM ||
ntohl(t->inp_faddr.s_addr) ==
INADDR_ANY) &&
(inp->inp_cred->cr_uid !=
t->inp_cred->cr_uid))
return (EADDRINUSE);
if (t && (! in_pcbbind_check_bindmulti(inp, t)))
return (EADDRINUSE);
}
#endif
}
t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr,
lport, lookupflags, cred);
if (t && (t->inp_flags & INP_TIMEWAIT)) {
/*
* XXXRW: If an incpb has had its timewait
* state recycled, we treat the address as
* being in use (for now). This is better
* than a panic, but not desirable.
*/
tw = intotw(t);
if (tw == NULL ||
((reuseport & tw->tw_so_options) == 0 &&
(reuseport_lb & tw->tw_so_options) == 0))
return (EADDRINUSE);
} else if (t && (reuseport & inp_so_options(t)) == 0 &&
(reuseport_lb & inp_so_options(t)) == 0) {
return (EADDRINUSE);
}
#ifdef INET
if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
struct sockaddr_in sin;
in6_sin6_2_sin(&sin, sin6);
t = in_pcblookup_local(pcbinfo, sin.sin_addr,
lport, lookupflags, cred);
if (t && t->inp_flags & INP_TIMEWAIT) {
tw = intotw(t);
if (tw == NULL)
return (EADDRINUSE);
if ((reuseport & tw->tw_so_options) == 0
&& (reuseport_lb & tw->tw_so_options) == 0
&& (ntohl(t->inp_laddr.s_addr) !=
INADDR_ANY || ((inp->inp_vflag &
INP_IPV6PROTO) ==
(t->inp_vflag & INP_IPV6PROTO))))
return (EADDRINUSE);
} else if (t &&
(reuseport & inp_so_options(t)) == 0 &&
(reuseport_lb & inp_so_options(t)) == 0 &&
(ntohl(t->inp_laddr.s_addr) != INADDR_ANY ||
(t->inp_vflag & INP_IPV6PROTO) != 0)) {
return (EADDRINUSE);
}
}
#endif
}
inp->in6p_laddr = sin6->sin6_addr;
}
if (lport == 0) {
if ((error = in6_pcbsetport(&inp->in6p_laddr, inp, cred)) != 0) {
/* Undo an address bind that may have occurred. */
inp->in6p_laddr = in6addr_any;
return (error);
}
} else {
inp->inp_lport = lport;
if (in_pcbinshash(inp) != 0) {
inp->in6p_laddr = in6addr_any;
inp->inp_lport = 0;
return (EAGAIN);
}
}
return (0);
}
/*
* Transform old in6_pcbconnect() into an inner subroutine for new
* in6_pcbconnect(): Do some validity-checking on the remote
* address (in mbuf 'nam') and then determine local host address
* (i.e., which interface) to use to access that remote host.
*
* This preserves definition of in6_pcbconnect(), while supporting a
* slightly different version for T/TCP. (This is more than
* a bit of a kludge, but cleaning up the internal interfaces would
* have forced minor changes in every protocol).
*/
static int
in6_pcbladdr(struct inpcb *inp, struct sockaddr *nam,
struct in6_addr *plocal_addr6)
{
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
int error = 0;
int scope_ambiguous = 0;
struct in6_addr in6a;
INP_WLOCK_ASSERT(inp);
INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo); /* XXXRW: why? */
if (nam->sa_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 && !V_ip6_use_defzone)
scope_ambiguous = 1;
if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
return(error);
if (!CK_STAILQ_EMPTY(&V_in6_ifaddrhead)) {
/*
* If the destination address is UNSPECIFIED addr,
* use the loopback addr, e.g ::1.
*/
if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
sin6->sin6_addr = in6addr_loopback;
}
if ((error = prison_remote_ip6(inp->inp_cred, &sin6->sin6_addr)) != 0)
return (error);
error = in6_selectsrc_socket(sin6, inp->in6p_outputopts,
inp, inp->inp_cred, scope_ambiguous, &in6a, NULL);
if (error)
return (error);
/*
* Do not update this earlier, in case we return with an error.
*
* XXX: this in6_selectsrc_socket result might replace the bound local
* address with the address specified by setsockopt(IPV6_PKTINFO).
* Is it the intended behavior?
*/
*plocal_addr6 = in6a;
/*
* Don't do pcblookup call here; return interface in
* plocal_addr6
* and exit to caller, that will do the lookup.
*/
return (0);
}
/*
* 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_mbuf(struct inpcb *inp, struct sockaddr *nam,
struct ucred *cred, struct mbuf *m)
{
struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
struct in6_addr addr6;
int error;
INP_WLOCK_ASSERT(inp);
INP_HASH_WLOCK_ASSERT(pcbinfo);
/*
* Call inner routine, to assign local interface address.
* in6_pcbladdr() may automatically fill in sin6_scope_id.
*/
if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0)
return (error);
if (in6_pcblookup_hash_locked(pcbinfo, &sin6->sin6_addr,
sin6->sin6_port,
IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
? &addr6 : &inp->in6p_laddr,
inp->inp_lport, 0, NULL) != NULL) {
return (EADDRINUSE);
}
if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
if (inp->inp_lport == 0) {
error = in6_pcbbind(inp, (struct sockaddr *)0, cred);
if (error)
return (error);
}
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_mbuf(inp, m);
return (0);
}
int
in6_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
{
return (in6_pcbconnect_mbuf(inp, nam, cred, NULL));
}
void
in6_pcbdisconnect(struct inpcb *inp)
{
INP_WLOCK_ASSERT(inp);
INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr));
inp->inp_fport = 0;
/* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
in_pcbrehash(inp);
}
struct sockaddr *
in6_sockaddr(in_port_t port, struct in6_addr *addr_p)
{
struct sockaddr_in6 *sin6;
sin6 = malloc(sizeof *sin6, M_SONAME, M_WAITOK);
bzero(sin6, sizeof *sin6);
sin6->sin6_family = AF_INET6;
sin6->sin6_len = sizeof(*sin6);
sin6->sin6_port = port;
sin6->sin6_addr = *addr_p;
(void)sa6_recoverscope(sin6); /* XXX: should catch errors */
return (struct sockaddr *)sin6;
}
struct sockaddr *
in6_v4mapsin6_sockaddr(in_port_t port, struct in_addr *addr_p)
{
struct sockaddr_in sin;
struct sockaddr_in6 *sin6_p;
bzero(&sin, sizeof sin);
sin.sin_family = AF_INET;
sin.sin_len = sizeof(sin);
sin.sin_port = port;
sin.sin_addr = *addr_p;
sin6_p = malloc(sizeof *sin6_p, M_SONAME,
M_WAITOK);
in6_sin_2_v4mapsin6(&sin, sin6_p);
return (struct sockaddr *)sin6_p;
}
int
in6_getsockaddr(struct socket *so, struct sockaddr **nam)
{
struct inpcb *inp;
struct in6_addr addr;
in_port_t port;
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("in6_getsockaddr: inp == NULL"));
INP_RLOCK(inp);
port = inp->inp_lport;
addr = inp->in6p_laddr;
INP_RUNLOCK(inp);
*nam = in6_sockaddr(port, &addr);
return 0;
}
int
in6_getpeeraddr(struct socket *so, struct sockaddr **nam)
{
struct inpcb *inp;
struct in6_addr addr;
in_port_t port;
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("in6_getpeeraddr: inp == NULL"));
INP_RLOCK(inp);
port = inp->inp_fport;
addr = inp->in6p_faddr;
INP_RUNLOCK(inp);
*nam = in6_sockaddr(port, &addr);
return 0;
}
int
in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam)
{
struct inpcb *inp;
int error;
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("in6_mapped_sockaddr: inp == NULL"));
#ifdef INET
if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
error = in_getsockaddr(so, nam);
if (error == 0)
in6_sin_2_v4mapsin6_in_sock(nam);
} else
#endif
{
/* scope issues will be handled in in6_getsockaddr(). */
error = in6_getsockaddr(so, nam);
}
return error;
}
int
in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam)
{
struct inpcb *inp;
int error;
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("in6_mapped_peeraddr: inp == NULL"));
#ifdef INET
if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
error = in_getpeeraddr(so, nam);
if (error == 0)
in6_sin_2_v4mapsin6_in_sock(nam);
} else
#endif
/* scope issues will be handled in in6_getpeeraddr(). */
error = in6_getpeeraddr(so, nam);
return error;
}
/*
* 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.
*/
void
in6_pcbnotify(struct inpcbinfo *pcbinfo, struct sockaddr *dst,
u_int fport_arg, const struct sockaddr *src, u_int lport_arg,
int cmd, void *cmdarg,
struct inpcb *(*notify)(struct inpcb *, int))
{
struct inpcb *inp, *inp_temp;
struct sockaddr_in6 sa6_src, *sa6_dst;
u_short fport = fport_arg, lport = lport_arg;
u_int32_t flowinfo;
int errno;
if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6)
return;
sa6_dst = (struct sockaddr_in6 *)dst;
if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr))
return;
/*
* 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((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr));
if (cmd != PRC_HOSTDEAD)
notify = in6_rtchange;
}
errno = inet6ctlerrmap[cmd];
INP_INFO_WLOCK(pcbinfo);
CK_LIST_FOREACH_SAFE(inp, pcbinfo->ipi_listhead, inp_list, inp_temp) {
INP_WLOCK(inp);
if ((inp->inp_vflag & INP_IPV6) == 0) {
INP_WUNLOCK(inp);
continue;
}
/*
* If the error designates a new path MTU for a destination
* and the application (associated with this socket) wanted to
* know the value, notify.
* XXX: should we avoid to notify the value to TCP sockets?
*/
if (cmd == PRC_MSGSIZE && cmdarg != NULL)
ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst,
*(u_int32_t *)cmdarg);
/*
* 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 &&
inp->inp_socket != NULL &&
flowinfo == (inp->inp_flow & IPV6_FLOWLABEL_MASK) &&
IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr))
goto do_notify;
else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
&sa6_dst->sin6_addr) ||
inp->inp_socket == 0 ||
(lport && inp->inp_lport != lport) ||
(!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) &&
!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
&sa6_src.sin6_addr)) ||
(fport && inp->inp_fport != fport)) {
INP_WUNLOCK(inp);
continue;
}
do_notify:
if (notify) {
if ((*notify)(inp, errno))
INP_WUNLOCK(inp);
} else
INP_WUNLOCK(inp);
}
INP_INFO_WUNLOCK(pcbinfo);
}
/*
* Lookup a PCB based on the local address and port. Caller must hold the
* hash lock. No inpcb locks or references are acquired.
*/
struct inpcb *
in6_pcblookup_local(struct inpcbinfo *pcbinfo, struct in6_addr *laddr,
u_short lport, int lookupflags, struct ucred *cred)
{
struct inpcb *inp;
int matchwild = 3, wildcard;
KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
("%s: invalid lookup flags %d", __func__, lookupflags));
INP_HASH_WLOCK_ASSERT(pcbinfo);
if ((lookupflags & INPLOOKUP_WILDCARD) == 0) {
struct inpcbhead *head;
/*
* Look for an unconnected (wildcard foreign addr) PCB that
* matches the local address and port we're looking for.
*/
head = &pcbinfo->ipi_hashbase[INP_PCBHASH(
INP6_PCBHASHKEY(&in6addr_any), lport, 0,
pcbinfo->ipi_hashmask)];
CK_LIST_FOREACH(inp, head, inp_hash) {
/* XXX inp locking */
if ((inp->inp_vflag & INP_IPV6) == 0)
continue;
if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
inp->inp_lport == lport) {
/* Found. */
if (cred == NULL ||
prison_equal_ip6(cred->cr_prison,
inp->inp_cred->cr_prison))
return (inp);
}
}
/*
* Not found.
*/
return (NULL);
} else {
struct inpcbporthead *porthash;
struct inpcbport *phd;
struct inpcb *match = NULL;
/*
* Best fit PCB lookup.
*
* First see if this local port is in use by looking on the
* port hash list.
*/
porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport,
pcbinfo->ipi_porthashmask)];
CK_LIST_FOREACH(phd, porthash, phd_hash) {
if (phd->phd_port == lport)
break;
}
if (phd != NULL) {
/*
* Port is in use by one or more PCBs. Look for best
* fit.
*/
CK_LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
wildcard = 0;
if (cred != NULL &&
!prison_equal_ip6(cred->cr_prison,
inp->inp_cred->cr_prison))
continue;
/* XXX inp locking */
if ((inp->inp_vflag & INP_IPV6) == 0)
continue;
if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
wildcard++;
if (!IN6_IS_ADDR_UNSPECIFIED(
&inp->in6p_laddr)) {
if (IN6_IS_ADDR_UNSPECIFIED(laddr))
wildcard++;
else if (!IN6_ARE_ADDR_EQUAL(
&inp->in6p_laddr, laddr))
continue;
} else {
if (!IN6_IS_ADDR_UNSPECIFIED(laddr))
wildcard++;
}
if (wildcard < matchwild) {
match = inp;
matchwild = wildcard;
if (matchwild == 0)
break;
}
}
}
return (match);
}
}
void
in6_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp)
{
struct inpcb *in6p;
struct ip6_moptions *im6o;
int i, gap;
INP_INFO_WLOCK(pcbinfo);
CK_LIST_FOREACH(in6p, pcbinfo->ipi_listhead, inp_list) {
INP_WLOCK(in6p);
if (__predict_false(in6p->inp_flags2 & INP_FREED)) {
INP_WUNLOCK(in6p);
continue;
}
im6o = in6p->in6p_moptions;
if ((in6p->inp_vflag & INP_IPV6) && im6o != NULL) {
/*
* Unselect the outgoing ifp for multicast 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.
*/
gap = 0;
for (i = 0; i < im6o->im6o_num_memberships; i++) {
if (im6o->im6o_membership[i]->in6m_ifp ==
ifp) {
in6_leavegroup(im6o->im6o_membership[i], NULL);
gap++;
} else if (gap != 0) {
im6o->im6o_membership[i - gap] =
im6o->im6o_membership[i];
}
}
im6o->im6o_num_memberships -= gap;
}
INP_WUNLOCK(in6p);
}
INP_INFO_WUNLOCK(pcbinfo);
}
/*
* 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 inpcb *inp)
{
RO_INVALIDATE_CACHE(&inp->inp_route6);
}
/*
* After a routing change, flush old routing
* and allocate a (hopefully) better one.
*/
struct inpcb *
in6_rtchange(struct inpcb *inp, int errno __unused)
{
RO_INVALIDATE_CACHE(&inp->inp_route6);
return inp;
}
static struct inpcb *
in6_pcblookup_lbgroup(const struct inpcbinfo *pcbinfo,
const struct in6_addr *laddr, uint16_t lport, const struct in6_addr *faddr,
uint16_t fport, int lookupflags)
{
struct inpcb *local_wild;
const struct inpcblbgrouphead *hdr;
struct inpcblbgroup *grp;
uint32_t idx;
INP_HASH_LOCK_ASSERT(pcbinfo);
hdr = &pcbinfo->ipi_lbgrouphashbase[
INP_PCBPORTHASH(lport, pcbinfo->ipi_lbgrouphashmask)];
/*
* Order of socket selection:
* 1. non-wild.
* 2. wild (if lookupflags contains INPLOOKUP_WILDCARD).
*
* NOTE:
* - Load balanced group does not contain jailed sockets.
* - Load balanced does not contain IPv4 mapped INET6 wild sockets.
*/
local_wild = NULL;
CK_LIST_FOREACH(grp, hdr, il_list) {
#ifdef INET
if (!(grp->il_vflag & INP_IPV6))
continue;
#endif
if (grp->il_lport != lport)
continue;
idx = INP_PCBLBGROUP_PKTHASH(INP6_PCBHASHKEY(faddr), lport,
fport) % grp->il_inpcnt;
if (IN6_ARE_ADDR_EQUAL(&grp->il6_laddr, laddr))
return (grp->il_inp[idx]);
if (IN6_IS_ADDR_UNSPECIFIED(&grp->il6_laddr) &&
(lookupflags & INPLOOKUP_WILDCARD) != 0)
local_wild = grp->il_inp[idx];
}
return (local_wild);
}
#ifdef PCBGROUP
/*
* Lookup PCB in hash list, using pcbgroup tables.
*/
static struct inpcb *
in6_pcblookup_group(struct inpcbinfo *pcbinfo, struct inpcbgroup *pcbgroup,
struct in6_addr *faddr, u_int fport_arg, struct in6_addr *laddr,
u_int lport_arg, int lookupflags, struct ifnet *ifp)
{
struct inpcbhead *head;
struct inpcb *inp, *tmpinp;
u_short fport = fport_arg, lport = lport_arg;
bool locked;
/*
* First look for an exact match.
*/
tmpinp = NULL;
INP_GROUP_LOCK(pcbgroup);
head = &pcbgroup->ipg_hashbase[INP_PCBHASH(
INP6_PCBHASHKEY(faddr), lport, fport, pcbgroup->ipg_hashmask)];
CK_LIST_FOREACH(inp, head, inp_pcbgrouphash) {
/* XXX inp locking */
if ((inp->inp_vflag & INP_IPV6) == 0)
continue;
if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
inp->inp_fport == fport &&
inp->inp_lport == lport) {
/*
* XXX We should be able to directly return
* the inp here, without any checks.
* Well unless both bound with SO_REUSEPORT?
*/
if (prison_flag(inp->inp_cred, PR_IP6))
goto found;
if (tmpinp == NULL)
tmpinp = inp;
}
}
if (tmpinp != NULL) {
inp = tmpinp;
goto found;
}
/*
* Then look for a wildcard match in the pcbgroup.
*/
if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
struct inpcb *local_wild = NULL, *local_exact = NULL;
struct inpcb *jail_wild = NULL;
int injail;
/*
* Order of socket selection - we always prefer jails.
* 1. jailed, non-wild.
* 2. jailed, wild.
* 3. non-jailed, non-wild.
* 4. non-jailed, wild.
*/
head = &pcbgroup->ipg_hashbase[
INP_PCBHASH(INADDR_ANY, lport, 0, pcbgroup->ipg_hashmask)];
CK_LIST_FOREACH(inp, head, inp_pcbgrouphash) {
/* XXX inp locking */
if ((inp->inp_vflag & INP_IPV6) == 0)
continue;
if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
inp->inp_lport != lport) {
continue;
}
injail = prison_flag(inp->inp_cred, PR_IP6);
if (injail) {
if (prison_check_ip6(inp->inp_cred,
laddr) != 0)
continue;
} else {
if (local_exact != NULL)
continue;
}
if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) {
if (injail)
goto found;
else
local_exact = inp;
} else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
if (injail)
jail_wild = inp;
else
local_wild = inp;
}
} /* LIST_FOREACH */
inp = jail_wild;
if (inp == NULL)
inp = jail_wild;
if (inp == NULL)
inp = local_exact;
if (inp == NULL)
inp = local_wild;
if (inp != NULL)
goto found;
}
/*
* Then look for a wildcard match, if requested.
*/
if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
struct inpcb *local_wild = NULL, *local_exact = NULL;
struct inpcb *jail_wild = NULL;
int injail;
/*
* Order of socket selection - we always prefer jails.
* 1. jailed, non-wild.
* 2. jailed, wild.
* 3. non-jailed, non-wild.
* 4. non-jailed, wild.
*/
head = &pcbinfo->ipi_wildbase[INP_PCBHASH(
INP6_PCBHASHKEY(&in6addr_any), lport, 0,
pcbinfo->ipi_wildmask)];
CK_LIST_FOREACH(inp, head, inp_pcbgroup_wild) {
/* XXX inp locking */
if ((inp->inp_vflag & INP_IPV6) == 0)
continue;
if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
inp->inp_lport != lport) {
continue;
}
injail = prison_flag(inp->inp_cred, PR_IP6);
if (injail) {
if (prison_check_ip6(inp->inp_cred,
laddr) != 0)
continue;
} else {
if (local_exact != NULL)
continue;
}
if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) {
if (injail)
goto found;
else
local_exact = inp;
} else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
if (injail)
jail_wild = inp;
else
local_wild = inp;
}
} /* LIST_FOREACH */
inp = jail_wild;
if (inp == NULL)
inp = jail_wild;
if (inp == NULL)
inp = local_exact;
if (inp == NULL)
inp = local_wild;
if (inp != NULL)
goto found;
} /* if ((lookupflags & INPLOOKUP_WILDCARD) != 0) */
INP_GROUP_UNLOCK(pcbgroup);
return (NULL);
found:
if (lookupflags & INPLOOKUP_WLOCKPCB)
locked = INP_TRY_WLOCK(inp);
else if (lookupflags & INPLOOKUP_RLOCKPCB)
locked = INP_TRY_RLOCK(inp);
else
panic("%s: locking buf", __func__);
if (!locked)
in_pcbref(inp);
INP_GROUP_UNLOCK(pcbgroup);
if (!locked) {
if (lookupflags & INPLOOKUP_WLOCKPCB) {
INP_WLOCK(inp);
if (in_pcbrele_wlocked(inp))
return (NULL);
} else {
INP_RLOCK(inp);
if (in_pcbrele_rlocked(inp))
return (NULL);
}
}
#ifdef INVARIANTS
if (lookupflags & INPLOOKUP_WLOCKPCB)
INP_WLOCK_ASSERT(inp);
else
INP_RLOCK_ASSERT(inp);
#endif
return (inp);
}
#endif /* PCBGROUP */
/*
* Lookup PCB in hash list.
*/
static struct inpcb *
in6_pcblookup_hash_locked(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
u_int fport_arg, struct in6_addr *laddr, u_int lport_arg,
int lookupflags, struct ifnet *ifp)
{
struct inpcbhead *head;
struct inpcb *inp, *tmpinp;
u_short fport = fport_arg, lport = lport_arg;
KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
("%s: invalid lookup flags %d", __func__, lookupflags));
INP_HASH_LOCK_ASSERT(pcbinfo);
/*
* First look for an exact match.
*/
tmpinp = NULL;
head = &pcbinfo->ipi_hashbase[INP_PCBHASH(
INP6_PCBHASHKEY(faddr), lport, fport, pcbinfo->ipi_hashmask)];
CK_LIST_FOREACH(inp, head, inp_hash) {
/* XXX inp locking */
if ((inp->inp_vflag & INP_IPV6) == 0)
continue;
if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
inp->inp_fport == fport &&
inp->inp_lport == lport) {
/*
* XXX We should be able to directly return
* the inp here, without any checks.
* Well unless both bound with SO_REUSEPORT?
*/
if (prison_flag(inp->inp_cred, PR_IP6))
return (inp);
if (tmpinp == NULL)
tmpinp = inp;
}
}
if (tmpinp != NULL)
return (tmpinp);
/*
* Then look in lb group (for wildcard match).
*/
if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
inp = in6_pcblookup_lbgroup(pcbinfo, laddr, lport, faddr,
fport, lookupflags);
if (inp != NULL)
return (inp);
}
/*
* Then look for a wildcard match, if requested.
*/
if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
struct inpcb *local_wild = NULL, *local_exact = NULL;
struct inpcb *jail_wild = NULL;
int injail;
/*
* Order of socket selection - we always prefer jails.
* 1. jailed, non-wild.
* 2. jailed, wild.
* 3. non-jailed, non-wild.
* 4. non-jailed, wild.
*/
head = &pcbinfo->ipi_hashbase[INP_PCBHASH(
INP6_PCBHASHKEY(&in6addr_any), lport, 0,
pcbinfo->ipi_hashmask)];
CK_LIST_FOREACH(inp, head, inp_hash) {
/* XXX inp locking */
if ((inp->inp_vflag & INP_IPV6) == 0)
continue;
if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
inp->inp_lport != lport) {
continue;
}
injail = prison_flag(inp->inp_cred, PR_IP6);
if (injail) {
if (prison_check_ip6(inp->inp_cred,
laddr) != 0)
continue;
} else {
if (local_exact != NULL)
continue;
}
if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) {
if (injail)
return (inp);
else
local_exact = inp;
} else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
if (injail)
jail_wild = inp;
else
local_wild = inp;
}
} /* LIST_FOREACH */
if (jail_wild != NULL)
return (jail_wild);
if (local_exact != NULL)
return (local_exact);
if (local_wild != NULL)
return (local_wild);
} /* if ((lookupflags & INPLOOKUP_WILDCARD) != 0) */
/*
* Not found.
*/
return (NULL);
}
/*
* Lookup PCB in hash list, using pcbinfo tables. This variation locks the
* hash list lock, and will return the inpcb locked (i.e., requires
* INPLOOKUP_LOCKPCB).
*/
static struct inpcb *
in6_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
u_int fport, struct in6_addr *laddr, u_int lport, int lookupflags,
struct ifnet *ifp)
{
struct inpcb *inp;
INP_HASH_RLOCK(pcbinfo);
inp = in6_pcblookup_hash_locked(pcbinfo, faddr, fport, laddr, lport,
(lookupflags & ~(INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)), ifp);
if (inp != NULL) {
if (lookupflags & INPLOOKUP_WLOCKPCB) {
INP_WLOCK(inp);
if (__predict_false(inp->inp_flags2 & INP_FREED)) {
INP_WUNLOCK(inp);
inp = NULL;
}
} else if (lookupflags & INPLOOKUP_RLOCKPCB) {
INP_RLOCK(inp);
if (__predict_false(inp->inp_flags2 & INP_FREED)) {
INP_RUNLOCK(inp);
inp = NULL;
}
} else
panic("%s: locking bug", __func__);
#ifdef INVARIANTS
if (inp != NULL) {
if (lookupflags & INPLOOKUP_WLOCKPCB)
INP_WLOCK_ASSERT(inp);
else
INP_RLOCK_ASSERT(inp);
}
#endif
}
INP_HASH_RUNLOCK(pcbinfo);
return (inp);
}
/*
* Public inpcb lookup routines, accepting a 4-tuple, and optionally, an mbuf
* from which a pre-calculated hash value may be extracted.
*
* Possibly more of this logic should be in in6_pcbgroup.c.
*/
struct inpcb *
in6_pcblookup(struct inpcbinfo *pcbinfo, struct in6_addr *faddr, u_int fport,
struct in6_addr *laddr, u_int lport, int lookupflags, struct ifnet *ifp)
{
#if defined(PCBGROUP) && !defined(RSS)
struct inpcbgroup *pcbgroup;
#endif
KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
("%s: invalid lookup flags %d", __func__, lookupflags));
KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
("%s: LOCKPCB not set", __func__));
/*
* When not using RSS, use connection groups in preference to the
* reservation table when looking up 4-tuples. When using RSS, just
* use the reservation table, due to the cost of the Toeplitz hash
* in software.
*
* XXXRW: This policy belongs in the pcbgroup code, as in principle
* we could be doing RSS with a non-Toeplitz hash that is affordable
* in software.
*/
#if defined(PCBGROUP) && !defined(RSS)
if (in_pcbgroup_enabled(pcbinfo)) {
pcbgroup = in6_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
fport);
return (in6_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
laddr, lport, lookupflags, ifp));
}
#endif
return (in6_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
lookupflags, ifp));
}
struct inpcb *
in6_pcblookup_mbuf(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
u_int fport, struct in6_addr *laddr, u_int lport, int lookupflags,
struct ifnet *ifp, struct mbuf *m)
{
#ifdef PCBGROUP
struct inpcbgroup *pcbgroup;
#endif
KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
("%s: invalid lookup flags %d", __func__, lookupflags));
KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
("%s: LOCKPCB not set", __func__));
#ifdef PCBGROUP
/*
* If we can use a hardware-generated hash to look up the connection
* group, use that connection group to find the inpcb. Otherwise
* fall back on a software hash -- or the reservation table if we're
* using RSS.
*
* XXXRW: As above, that policy belongs in the pcbgroup code.
*/
if (in_pcbgroup_enabled(pcbinfo) &&
M_HASHTYPE_TEST(m, M_HASHTYPE_NONE) == 0) {
pcbgroup = in6_pcbgroup_byhash(pcbinfo, M_HASHTYPE_GET(m),
m->m_pkthdr.flowid);
if (pcbgroup != NULL)
return (in6_pcblookup_group(pcbinfo, pcbgroup, faddr,
fport, laddr, lport, lookupflags, ifp));
#ifndef RSS
pcbgroup = in6_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
fport);
return (in6_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
laddr, lport, lookupflags, ifp));
#endif
}
#endif
return (in6_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
lookupflags, ifp));
}
void
init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m, int srcordst)
{
struct ip6_hdr *ip;
ip = mtod(m, struct ip6_hdr *);
bzero(sin6, sizeof(*sin6));
sin6->sin6_len = sizeof(*sin6);
sin6->sin6_family = AF_INET6;
sin6->sin6_addr = srcordst ? ip->ip6_dst : ip->ip6_src;
(void)sa6_recoverscope(sin6); /* XXX: should catch errors... */
return;
}
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