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freebsd-skq/sys/netinet6/in6_pcb.c
shin b8a80c0b8f remove unnecessary "$ifdef INET6"
2000-01-13 05:01:27 +00:00

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/*
* 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.
*
* $FreeBSD$
*/
/*
* 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
* $FreeBSD$
*/
#include "opt_ipsec.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/proc.h>
#include <sys/jail.h>
#include <vm/vm_zone.h>
#include <net/if.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 <netinet6/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 "faith.h"
#ifdef IPSEC
#include <netinet6/ipsec.h>
#include <netinet6/ah.h>
#include <netinet6/ipsec6.h>
#include <netinet6/ah6.h>
#include <netkey/key.h>
#ifdef IPSEC_DEBUG
#include <netkey/key_debug.h>
#else
#define KEYDEBUG(lev,arg)
#endif /* IPSEC_DEBUG */
#endif /* IPSEC */
struct in6_addr zeroin6_addr;
int
in6_pcbbind(inp, nam, p)
register struct inpcb *inp;
struct sockaddr *nam;
struct proc *p;
{
struct socket *so = inp->inp_socket;
unsigned short *lastport;
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL;
struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
u_short lport = 0;
int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
int error;
if (!in6_ifaddr) /* 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)) == 0)
wild = 1;
if (nam) {
sin6 = (struct sockaddr_in6 *)nam;
if (nam->sa_len != sizeof(*sin6))
return(EINVAL);
/*
* family check.
*/
if (nam->sa_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 (inp->in6p_outputopts &&
(pi = inp->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)
&& inp->in6p_moptions
&& inp->in6p_moptions->im6o_multicast_ifp) {
sin6->sin6_addr.s6_addr16[1] =
htons(inp->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_UNSPECIFIED(&sin6->sin6_addr)) {
struct ifaddr *ia = NULL;
sin6->sin6_port = 0; /* yech... */
if ((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) {
struct inpcb *t;
/* GROSS */
if (ntohs(lport) < IPV6PORT_RESERVED && p &&
suser_xxx(0, p, PRISON_ROOT))
return(EACCES);
if (so->so_cred->cr_uid != 0 &&
!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
t = in6_pcblookup_local(pcbinfo,
&sin6->sin6_addr, lport,
INPLOOKUP_WILDCARD);
if (t &&
(!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
!IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) ||
(t->inp_socket->so_options &
SO_REUSEPORT) == 0) &&
(so->so_cred->cr_uid !=
t->inp_socket->so_cred->cr_uid))
return (EADDRINUSE);
if (ip6_mapped_addr_on != 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);
if (t &&
(so->so_cred->cr_uid !=
t->inp_socket->so_cred->cr_uid) &&
(ntohl(t->inp_laddr.s_addr) !=
INADDR_ANY ||
INP_SOCKAF(so) ==
INP_SOCKAF(t->inp_socket)))
return (EADDRINUSE);
}
}
t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr,
lport, wild);
if (t && (reuseport & t->inp_socket->so_options) == 0)
return(EADDRINUSE);
if (ip6_mapped_addr_on != 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, wild);
if (t &&
(reuseport & t->inp_socket->so_options)
== 0 &&
(ntohl(t->inp_laddr.s_addr)
!= INADDR_ANY ||
INP_SOCKAF(so) ==
INP_SOCKAF(t->inp_socket)))
return (EADDRINUSE);
}
}
inp->in6p_laddr = sin6->sin6_addr;
}
if (lport == 0) {
ushort first, last;
int count;
inp->inp_flags |= INP_ANONPORT;
if (inp->inp_flags & INP_HIGHPORT) {
first = ipport_hifirstauto; /* sysctl */
last = ipport_hilastauto;
lastport = &pcbinfo->lasthi;
} else if (inp->inp_flags & INP_LOWPORT) {
if (p && (error = suser_xxx(0, p, PRISON_ROOT)))
return error;
first = ipport_lowfirstauto; /* 1023 */
last = ipport_lowlastauto; /* 600 */
lastport = &pcbinfo->lastlow;
} else {
first = ipport_firstauto; /* sysctl */
last = ipport_lastauto;
lastport = &pcbinfo->lastport;
}
/*
* Simple check to ensure all ports are not used up causing
* a deadlock here.
*
* We split the two cases (up and down) so that the direction
* is not being tested on each round of the loop.
*/
if (first > last) {
/*
* counting down
*/
count = first - last;
do {
if (count-- < 0) { /* completely used? */
/*
* Undo any address bind that may have
* occurred above.
*/
inp->in6p_laddr = in6addr_any;
return (EAGAIN);
}
--*lastport;
if (*lastport > first || *lastport < last)
*lastport = first;
lport = htons(*lastport);
} while (in6_pcblookup_local(pcbinfo,
&inp->in6p_laddr, lport, wild));
} else {
/*
* counting up
*/
count = last - first;
do {
if (count-- < 0) { /* completely used? */
/*
* Undo any address bind that may have
* occurred above.
*/
inp->in6p_laddr = in6addr_any;
return (EAGAIN);
}
++*lastport;
if (*lastport < first || *lastport > last)
*lastport = first;
lport = htons(*lastport);
} while (in6_pcblookup_local(pcbinfo,
&inp->in6p_laddr, lport, wild));
}
}
inp->inp_lport = lport;
if (in_pcbinshash(inp) != 0) {
inp->in6p_laddr = in6addr_any;
inp->inp_lport = 0;
return (EAGAIN);
}
inp->in6p_flowinfo = sin6 ? sin6->sin6_flowinfo : 0; /*XXX*/
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).
*/
int
in6_pcbladdr(inp, nam, plocal_addr6)
register struct inpcb *inp;
struct sockaddr *nam;
struct in6_addr **plocal_addr6;
{
register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
struct in6_pktinfo *pi;
struct ifnet *ifp = NULL;
int error = 0;
if (nam->sa_len != sizeof (*sin6))
return (EINVAL);
if (sin6->sin6_family != AF_INET6)
return (EAFNOSUPPORT);
if (sin6->sin6_port == 0)
return (EADDRNOTAVAIL);
/*
* 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 (inp->in6p_outputopts &&
(pi = inp->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) &&
inp->in6p_moptions &&
inp->in6p_moptions->im6o_multicast_ifp) {
sin6->sin6_addr.s6_addr16[1] =
htons(inp->in6p_moptions->im6o_multicast_ifp->if_index);
ifp = ifindex2ifnet[inp->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];
}
}
if (in6_ifaddr) {
/*
* 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;
}
{
/*
* XXX: in6_selectsrc might replace the bound local address
* with the address specified by setsockopt(IPV6_PKTINFO).
* Is it the intended behavior?
*/
*plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts,
inp->in6p_moptions,
&inp->in6p_route,
&inp->in6p_laddr, &error);
if (*plocal_addr6 == 0) {
if (error == 0)
error = EADDRNOTAVAIL;
return(error);
}
/*
* Don't do pcblookup call here; return interface in
* plocal_addr6
* and exit to caller, that will do the lookup.
*/
}
if (inp->in6p_route.ro_rt)
ifp = inp->in6p_route.ro_rt->rt_ifp;
inp->in6p_ip6_hlim = (u_int8_t)in6_selecthlim(inp, ifp);
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(inp, nam, p)
register struct inpcb *inp;
struct sockaddr *nam;
struct proc *p;
{
struct in6_addr *addr6;
register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
int error;
/*
* Call inner routine, to assign local interface address.
*/
if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0)
return(error);
if (in6_pcblookup_hash(inp->inp_pcbinfo, &sin6->sin6_addr,
sin6->sin6_port,
IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
? addr6 : &inp->in6p_laddr,
inp->inp_lport, 0, NULL) != NULL) {
return (EADDRINUSE);
}
if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
if (inp->inp_lport == 0) {
error = in6_pcbbind(inp, (struct sockaddr *)0, p);
if (error)
return (error);
}
inp->in6p_laddr = *addr6;
}
inp->in6p_faddr = sin6->sin6_addr;
inp->inp_fport = sin6->sin6_port;
/*
* xxx kazu flowlabel is necessary for connect?
* but if this line is missing, the garbage value remains.
*/
inp->in6p_flowinfo = sin6->sin6_flowinfo;
if ((inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) == 0 &&
ip6_auto_flowlable != 0)
inp->in6p_flowinfo |=
(htonl(ip6_flow_seq++) & IPV6_FLOWLABEL_MASK);
in_pcbrehash(inp);
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(&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, 0UL);
} 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 (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(inp)
struct inpcb *inp;
{
bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr));
inp->inp_fport = 0;
in_pcbrehash(inp);
if (inp->inp_socket->so_state & SS_NOFDREF)
in6_pcbdetach(inp);
}
void
in6_pcbdetach(inp)
struct inpcb *inp;
{
struct socket *so = inp->inp_socket;
struct inpcbinfo *ipi = inp->inp_pcbinfo;
#ifdef IPSEC
if (sotoinpcb(so) != 0)
key_freeso(so);
ipsec6_delete_pcbpolicy(inp);
#endif /* IPSEC */
inp->inp_gencnt = ++ipi->ipi_gencnt;
in_pcbremlists(inp);
sotoinpcb(so) = 0;
sofree(so);
if (inp->in6p_options)
m_freem(inp->in6p_options);
if (inp->in6p_outputopts) {
if (inp->in6p_outputopts->ip6po_rthdr &&
inp->in6p_outputopts->ip6po_route.ro_rt)
RTFREE(inp->in6p_outputopts->ip6po_route.ro_rt);
if (inp->in6p_outputopts->ip6po_m)
(void)m_free(inp->in6p_outputopts->ip6po_m);
free(inp->in6p_outputopts, M_IP6OPT);
}
if (inp->in6p_route.ro_rt)
rtfree(inp->in6p_route.ro_rt);
ip6_freemoptions(inp->in6p_moptions);
/* Check and free IPv4 related resources in case of mapped addr */
if (inp->inp_options)
(void)m_free(inp->inp_options);
if (inp->inp_route.ro_rt)
rtfree(inp->inp_route.ro_rt);
ip_freemoptions(inp->inp_moptions);
inp->inp_vflag = 0;
zfreei(ipi->ipi_zone, inp);
}
/*
* The calling convention of in6_setsockaddr() and in6_setpeeraddr() was
* modified to match the pru_sockaddr() and pru_peeraddr() entry points
* in struct pr_usrreqs, so that protocols can just reference then directly
* without the need for a wrapper function. The socket must have a valid
* (i.e., non-nil) PCB, but it should be impossible to get an invalid one
* except through a kernel programming error, so it is acceptable to panic
* (or in this case trap) if the PCB is invalid. (Actually, we don't trap
* because there actually /is/ a programming error somewhere... XXX)
*/
int
in6_setsockaddr(so, nam)
struct socket *so;
struct sockaddr **nam;
{
int s;
register struct inpcb *inp;
register struct sockaddr_in6 *sin6;
/*
* Do the malloc first in case it blocks.
*/
MALLOC(sin6, struct sockaddr_in6 *, sizeof *sin6, M_SONAME, M_WAITOK);
bzero(sin6, sizeof *sin6);
sin6->sin6_family = AF_INET6;
sin6->sin6_len = sizeof(*sin6);
s = splnet();
inp = sotoinpcb(so);
if (!inp) {
splx(s);
free(sin6, M_SONAME);
return EINVAL;
}
sin6->sin6_port = inp->inp_lport;
sin6->sin6_addr = inp->in6p_laddr;
splx(s);
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;
*nam = (struct sockaddr *)sin6;
return 0;
}
int
in6_setpeeraddr(so, nam)
struct socket *so;
struct sockaddr **nam;
{
int s;
struct inpcb *inp;
register struct sockaddr_in6 *sin6;
/*
* Do the malloc first in case it blocks.
*/
MALLOC(sin6, struct sockaddr_in6 *, sizeof(*sin6), M_SONAME, M_WAITOK);
bzero((caddr_t)sin6, sizeof (*sin6));
sin6->sin6_family = AF_INET6;
sin6->sin6_len = sizeof(struct sockaddr_in6);
s = splnet();
inp = sotoinpcb(so);
if (!inp) {
splx(s);
free(sin6, M_SONAME);
return EINVAL;
}
sin6->sin6_port = inp->inp_fport;
sin6->sin6_addr = inp->in6p_faddr;
splx(s);
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;
*nam = (struct sockaddr *)sin6;
return 0;
}
int
in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam)
{
struct inpcb *inp = sotoinpcb(so);
int error;
if (inp == NULL)
return EINVAL;
if (inp->inp_vflag & INP_IPV4) {
error = in_setsockaddr(so, nam);
if (error == 0)
in6_sin_2_v4mapsin6_in_sock(nam);
} else
error = in6_setsockaddr(so, nam);
return error;
}
int
in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam)
{
struct inpcb *inp = sotoinpcb(so);
int error;
if (inp == NULL)
return EINVAL;
if (inp->inp_vflag & INP_IPV4) {
error = in_setpeeraddr(so, nam);
if (error == 0)
in6_sin_2_v4mapsin6_in_sock(nam);
} else
error = in6_setpeeraddr(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.
*
* Must be called at splnet.
*/
void
in6_pcbnotify(head, dst, fport_arg, laddr6, lport_arg, cmd, notify)
struct inpcbhead *head;
struct sockaddr *dst;
u_int fport_arg, lport_arg;
struct in6_addr *laddr6;
int cmd;
void (*notify) __P((struct inpcb *, int));
{
struct inpcb *inp, *oinp;
struct in6_addr faddr6;
u_short fport = fport_arg, lport = lport_arg;
int errno, s;
if ((unsigned)cmd > PRC_NCMDS || dst->sa_family != AF_INET6)
return;
faddr6 = ((struct sockaddr_in6 *)dst)->sin6_addr;
if (IN6_IS_ADDR_UNSPECIFIED(&faddr6))
return;
/*
* 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;
}
errno = inet6ctlerrmap[cmd];
s = splnet();
for (inp = LIST_FIRST(head); inp != NULL;) {
if ((inp->inp_vflag & INP_IPV6) == 0) {
inp = LIST_NEXT(inp, inp_list);
continue;
}
if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &faddr6) ||
inp->inp_socket == 0 ||
(lport && inp->inp_lport != lport) ||
(!IN6_IS_ADDR_UNSPECIFIED(laddr6) &&
!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr6)) ||
(fport && inp->inp_fport != fport)) {
inp = LIST_NEXT(inp, inp_list);
continue;
}
oinp = inp;
inp = LIST_NEXT(inp, inp_list);
if (notify)
(*notify)(oinp, errno);
}
splx(s);
}
/*
* Lookup a PCB based on the local address and port.
*/
struct inpcb *
in6_pcblookup_local(pcbinfo, laddr, lport_arg, wild_okay)
struct inpcbinfo *pcbinfo;
struct in6_addr *laddr;
u_int lport_arg;
int wild_okay;
{
register struct inpcb *inp;
int matchwild = 3, wildcard;
u_short lport = lport_arg;
if (!wild_okay) {
struct inpcbhead *head;
/*
* Look for an unconnected (wildcard foreign addr) PCB that
* matches the local address and port we're looking for.
*/
head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0,
pcbinfo->hashmask)];
LIST_FOREACH(inp, head, inp_hash) {
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.
*/
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->porthashbase[INP_PCBPORTHASH(lport,
pcbinfo->porthashmask)];
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.
*/
LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
wildcard = 0;
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);
}
}
/*
* 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 inpcb *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(inp, errno)
struct inpcb *inp;
int errno;
{
if (inp->in6p_route.ro_rt) {
rtfree(inp->in6p_route.ro_rt);
inp->in6p_route.ro_rt = 0;
/*
* A new route can be allocated the next time
* output is attempted.
*/
}
}
/*
* Lookup PCB in hash list.
*/
struct inpcb *
in6_pcblookup_hash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard, ifp)
struct inpcbinfo *pcbinfo;
struct in6_addr *faddr, *laddr;
u_int fport_arg, lport_arg;
int wildcard;
struct ifnet *ifp;
{
struct inpcbhead *head;
register struct inpcb *inp;
u_short fport = fport_arg, lport = lport_arg;
/*
* First look for an exact match.
*/
head = &pcbinfo->hashbase[INP_PCBHASH(faddr->s6_addr32[3] /* XXX */,
lport, fport,
pcbinfo->hashmask)];
LIST_FOREACH(inp, head, inp_hash) {
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) {
/*
* Found.
*/
return (inp);
}
}
if (wildcard) {
struct inpcb *local_wild = NULL;
head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0,
pcbinfo->hashmask)];
LIST_FOREACH(inp, head, inp_hash) {
if ((inp->inp_vflag & INP_IPV6) == 0)
continue;
if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
inp->inp_lport == lport) {
#if defined(NFAITH) && NFAITH > 0
if (ifp && ifp->if_type == IFT_FAITH &&
(inp->inp_flags & INP_FAITH) == 0)
continue;
#endif
if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
laddr))
return (inp);
else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
local_wild = inp;
}
}
return (local_wild);
}
/*
* Not found.
*/
return (NULL);
}
void
init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m)
{
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 = ip->ip6_src;
if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
sin6->sin6_addr.s6_addr16[1] = 0;
sin6->sin6_scope_id =
(m->m_pkthdr.rcvif && IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
? m->m_pkthdr.rcvif->if_index : 0;
return;
}
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