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freebsd-skq/sys/netinet6/in6_pcb.c
rwatson 71cc03392b Break out in_pcbdetach() into two functions: 
- in_pcbdetach(), which removes the link between an inpcb and its
  socket.

- in_pcbfree(), which frees a detached pcb.

Unlike the previous in_pcbdetach(), neither of these functions will
attempt to conditionally free the socket, as they are responsible only
for managing in_pcb memory.  Mirror these changes into in6_pcbdetach()
by breaking it into in6_pcbdetach() and in6_pcbfree().

While here, eliminate undesired checks for NULL inpcb pointers in
sockets, as we will now have as an invariant that sockets will always
have valid so_pcb pointers.

MFC after:	3 months
2006-04-01 16:04:42 +00:00

962 lines
26 KiB
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/* $FreeBSD$ */
/* $KAME: in6_pcb.c,v 1.31 2001/05/21 05:45:10 jinmei 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.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)in_pcb.c 8.2 (Berkeley) 1/4/94
*/
#include "opt_inet.h"
#include "opt_inet6.h"
#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/uma.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 <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>
#ifdef IPSEC
#include <netinet6/ipsec.h>
#ifdef INET6
#include <netinet6/ipsec6.h>
#endif
#include <netinet6/ah.h>
#ifdef INET6
#include <netinet6/ah6.h>
#endif
#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;
int
in6_pcbbind(inp, nam, cred)
register 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 wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
INP_INFO_WLOCK_ASSERT(pcbinfo);
INP_LOCK_ASSERT(inp);
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) {
int error;
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, 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_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.
* We should allow to bind to a deprecated address, since
* the application dares to use it.
*/
if (ia &&
((struct in6_ifaddr *)ia)->ia6_flags &
(IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) {
return (EADDRNOTAVAIL);
}
}
if (lport) {
struct inpcb *t;
/* GROSS */
if (ntohs(lport) <= ipport_reservedhigh &&
ntohs(lport) >= ipport_reservedlow &&
suser_cred(cred, SUSER_ALLOWJAIL))
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 &&
((t->inp_vflag & 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_socket->so_options & SO_REUSEPORT)
== 0) && (so->so_cred->cr_uid !=
t->inp_socket->so_cred->cr_uid))
return (EADDRINUSE);
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);
if (t &&
((t->inp_vflag &
INP_TIMEWAIT) == 0) &&
(so->so_type != SOCK_STREAM ||
ntohl(t->inp_faddr.s_addr) ==
INADDR_ANY) &&
(so->so_cred->cr_uid !=
t->inp_socket->so_cred->cr_uid))
return (EADDRINUSE);
}
}
t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr,
lport, wild);
if (t && (reuseport & ((t->inp_vflag & INP_TIMEWAIT) ?
intotw(t)->tw_so_options :
t->inp_socket->so_options)) == 0)
return (EADDRINUSE);
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, wild);
if (t && t->inp_vflag & INP_TIMEWAIT) {
if ((reuseport &
intotw(t)->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 & 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) {
int e;
if ((e = in6_pcbsetport(&inp->in6p_laddr, inp, cred)) != 0)
return (e);
}
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).
*/
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;
int error = 0;
struct ifnet *ifp = NULL;
int scope_ambiguous = 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 (sin6->sin6_scope_id == 0 && !ip6_use_defzone)
scope_ambiguous = 1;
if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0)
return(error);
INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
INP_LOCK_ASSERT(inp);
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, NULL,
&inp->in6p_laddr, &ifp, &error);
if (ifp && scope_ambiguous &&
(error = in6_setscope(&sin6->sin6_addr, ifp, NULL)) != 0) {
return(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.
*/
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, cred)
register struct inpcb *inp;
struct sockaddr *nam;
struct ucred *cred;
{
struct in6_addr *addr6;
register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
int error;
INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
INP_LOCK_ASSERT(inp);
/*
* 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(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, 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->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
if (inp->in6p_flags & IN6P_AUTOFLOWLABEL)
inp->in6p_flowinfo |=
(htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
in_pcbrehash(inp);
#ifdef IPSEC
if (inp->inp_socket->so_type == SOCK_STREAM)
ipsec_pcbconn(inp->inp_sp);
#endif
return (0);
}
void
in6_pcbdisconnect(inp)
struct inpcb *inp;
{
INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
INP_LOCK_ASSERT(inp);
bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr));
inp->inp_fport = 0;
/* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
in_pcbrehash(inp);
#ifdef IPSEC
ipsec_pcbdisconn(inp->inp_sp);
#endif
}
void
in6_pcbdetach(struct inpcb *inp)
{
KASSERT(inp->inp_socket != NULL, ("in6_pcbdetach: inp_socket == NULL"));
inp->inp_socket->so_pcb = NULL;
inp->inp_socket = NULL;
}
void
in6_pcbfree(struct inpcb *inp)
{
struct inpcbinfo *ipi = inp->inp_pcbinfo;
KASSERT(inp->inp_socket == NULL, ("in6_pcbfree: inp_socket != NULL"));
INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
INP_LOCK_ASSERT(inp);
#if defined(IPSEC) || defined(FAST_IPSEC)
if (inp->in6p_sp != NULL)
ipsec6_delete_pcbpolicy(inp);
#endif /* IPSEC */
inp->inp_gencnt = ++ipi->ipi_gencnt;
in_pcbremlists(inp);
ip6_freepcbopts(inp->in6p_outputopts);
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);
ip_freemoptions(inp->inp_moptions);
inp->inp_vflag = 0;
INP_LOCK_DESTROY(inp);
uma_zfree(ipi->ipi_zone, inp);
}
struct sockaddr *
in6_sockaddr(port, addr_p)
in_port_t port;
struct in6_addr *addr_p;
{
struct sockaddr_in6 *sin6;
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);
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(port, addr_p)
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;
MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME,
M_WAITOK);
in6_sin_2_v4mapsin6(&sin, sin6_p);
return (struct sockaddr *)sin6_p;
}
/*
* 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;
struct in6_addr addr;
in_port_t port;
s = splnet();
inp = sotoinpcb(so);
if (!inp) {
splx(s);
return EINVAL;
}
port = inp->inp_lport;
addr = inp->in6p_laddr;
splx(s);
*nam = in6_sockaddr(port, &addr);
return 0;
}
int
in6_setpeeraddr(so, nam)
struct socket *so;
struct sockaddr **nam;
{
int s;
struct inpcb *inp;
struct in6_addr addr;
in_port_t port;
s = splnet();
inp = sotoinpcb(so);
if (!inp) {
splx(s);
return EINVAL;
}
port = inp->inp_fport;
addr = inp->in6p_faddr;
splx(s);
*nam = in6_sockaddr(port, &addr);
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 | INP_IPV6)) == INP_IPV4) {
error = in_setsockaddr(so, nam, &tcbinfo);
if (error == 0)
in6_sin_2_v4mapsin6_in_sock(nam);
} else {
/* scope issues will be handled in in6_setsockaddr(). */
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 | INP_IPV6)) == INP_IPV4) {
error = in_setpeeraddr(so, nam, &tcbinfo);
if (error == 0)
in6_sin_2_v4mapsin6_in_sock(nam);
} else
/* scope issues will be handled in in6_setpeeraddr(). */
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(pcbinfo, dst, fport_arg, src, lport_arg, cmd, cmdarg, notify)
struct inpcbinfo *pcbinfo;
struct sockaddr *dst;
const struct sockaddr *src;
u_int fport_arg, lport_arg;
int cmd;
void *cmdarg;
struct inpcb *(*notify) __P((struct inpcb *, int));
{
struct inpcbhead *head;
struct inpcb *inp, *ninp;
struct sockaddr_in6 sa6_src, *sa6_dst;
u_short fport = fport_arg, lport = lport_arg;
u_int32_t flowinfo;
int errno, s;
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];
s = splnet();
head = pcbinfo->listhead;
INP_INFO_WLOCK(pcbinfo);
for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) {
INP_LOCK(inp);
ninp = LIST_NEXT(inp, inp_list);
if ((inp->inp_vflag & INP_IPV6) == 0) {
INP_UNLOCK(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. 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 && (inp->inp_flags & IN6P_MTU) != 0 &&
(IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) {
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->in6p_flowinfo & 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_UNLOCK(inp);
continue;
}
do_notify:
if (notify) {
if ((*notify)(inp, errno))
INP_UNLOCK(inp);
} else
INP_UNLOCK(inp);
}
INP_INFO_WUNLOCK(pcbinfo);
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);
}
}
void
in6_pcbpurgeif0(head, ifp)
struct in6pcb *head;
struct ifnet *ifp;
{
struct in6pcb *in6p;
struct ip6_moptions *im6o;
struct in6_multi_mship *imm, *nimm;
for (in6p = head; in6p != NULL; in6p = LIST_NEXT(in6p, inp_list)) {
im6o = in6p->in6p_moptions;
if ((in6p->inp_vflag & INP_IPV6) &&
im6o) {
/*
* Unselect the outgoing interface if it is being
* detached.
*/
if (im6o->im6o_multicast_ifp == ifp)
im6o->im6o_multicast_ifp = NULL;
/*
* Drop multicast group membership if we joined
* through the interface being detached.
* XXX controversial - is it really legal for kernel
* to force this?
*/
for (imm = im6o->im6o_memberships.lh_first;
imm != NULL; imm = nimm) {
nimm = imm->i6mm_chain.le_next;
if (imm->i6mm_maddr->in6m_ifp == ifp) {
LIST_REMOVE(imm, i6mm_chain);
in6_delmulti(imm->i6mm_maddr);
free(imm, M_IP6MADDR);
}
}
}
}
}
/*
* 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;
{
/*
* We don't store route pointers in the routing table anymore
*/
return;
}
/*
* After a routing change, flush old routing
* and allocate a (hopefully) better one.
*/
struct inpcb *
in6_rtchange(inp, errno)
struct inpcb *inp;
int errno;
{
/*
* We don't store route pointers in the routing table anymore
*/
return inp;
}
/*
* 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;
int faith;
if (faithprefix_p != NULL)
faith = (*faithprefix_p)(laddr);
else
faith = 0;
/*
* 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 (faith && (inp->inp_flags & INP_FAITH) == 0)
continue;
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;
(void)sa6_recoverscope(sin6); /* XXX: should catch errors... */
return;
}
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