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freebsd-nq/sys/netinet/in_pcb.c
Robert Watson a557af222b Introduce a MAC label reference in 'struct inpcb', which caches 
the   MAC label referenced from 'struct socket' in the IPv4 and
IPv6-based protocols.  This permits MAC labels to be checked during
network delivery operations without dereferencing inp->inp_socket
to get to so->so_label, which will eventually avoid our having to
grab the socket lock during delivery at the network layer.

This change introduces 'struct inpcb' as a labeled object to the
MAC Framework, along with the normal circus of entry points:
initialization, creation from socket, destruction, as well as a
delivery access control check.

For most policies, the inpcb label will simply be a cache of the
socket label, so a new protocol switch method is introduced,
pr_sosetlabel() to notify protocols that the socket layer label
has been updated so that the cache can be updated while holding
appropriate locks.  Most protocols implement this using
pru_sosetlabel_null(), but IPv4/IPv6 protocols using inpcbs use
the the worker function in_pcbsosetlabel(), which calls into the
MAC Framework to perform a cache update.

Biba, LOMAC, and MLS implement these entry points, as do the stub
policy, and test policy.

Reviewed by:	sam, bms
Obtained from:	TrustedBSD Project
Sponsored by:	DARPA, Network Associates Laboratories
2003-11-18 00:39:07 +00:00

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/*
* Copyright (c) 1982, 1986, 1991, 1993, 1995
* 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 8.4 (Berkeley) 5/24/95
* $FreeBSD$
*/
#include "opt_ipsec.h"
#include "opt_inet6.h"
#include "opt_mac.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/limits.h>
#include <sys/mac.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/proc.h>
#include <sys/jail.h>
#include <sys/kernel.h>
#include <sys/sysctl.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_pcb.h>
#include <netinet/in_var.h>
#include <netinet/ip_var.h>
#include <netinet/tcp_var.h>
#ifdef INET6
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#endif /* INET6 */
#ifdef IPSEC
#include <netinet6/ipsec.h>
#include <netkey/key.h>
#endif /* IPSEC */
#ifdef FAST_IPSEC
#if defined(IPSEC) || defined(IPSEC_ESP)
#error "Bad idea: don't compile with both IPSEC and FAST_IPSEC!"
#endif
#include <netipsec/ipsec.h>
#include <netipsec/key.h>
#endif /* FAST_IPSEC */
struct in_addr zeroin_addr;
/*
* These configure the range of local port addresses assigned to
* "unspecified" outgoing connections/packets/whatever.
*/
int ipport_lowfirstauto = IPPORT_RESERVED - 1; /* 1023 */
int ipport_lowlastauto = IPPORT_RESERVEDSTART; /* 600 */
int ipport_firstauto = IPPORT_HIFIRSTAUTO; /* 49152 */
int ipport_lastauto = IPPORT_HILASTAUTO; /* 65535 */
int ipport_hifirstauto = IPPORT_HIFIRSTAUTO; /* 49152 */
int ipport_hilastauto = IPPORT_HILASTAUTO; /* 65535 */
/*
* Reserved ports accessible only to root. There are significant
* security considerations that must be accounted for when changing these,
* but the security benefits can be great. Please be careful.
*/
int ipport_reservedhigh = IPPORT_RESERVED - 1; /* 1023 */
int ipport_reservedlow = 0;
#define RANGECHK(var, min, max) \
if ((var) < (min)) { (var) = (min); } \
else if ((var) > (max)) { (var) = (max); }
static int
sysctl_net_ipport_check(SYSCTL_HANDLER_ARGS)
{
int error = sysctl_handle_int(oidp,
oidp->oid_arg1, oidp->oid_arg2, req);
if (!error) {
RANGECHK(ipport_lowfirstauto, 1, IPPORT_RESERVED - 1);
RANGECHK(ipport_lowlastauto, 1, IPPORT_RESERVED - 1);
RANGECHK(ipport_firstauto, IPPORT_RESERVED, USHRT_MAX);
RANGECHK(ipport_lastauto, IPPORT_RESERVED, USHRT_MAX);
RANGECHK(ipport_hifirstauto, IPPORT_RESERVED, USHRT_MAX);
RANGECHK(ipport_hilastauto, IPPORT_RESERVED, USHRT_MAX);
}
return error;
}
#undef RANGECHK
SYSCTL_NODE(_net_inet_ip, IPPROTO_IP, portrange, CTLFLAG_RW, 0, "IP Ports");
SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowfirst, CTLTYPE_INT|CTLFLAG_RW,
&ipport_lowfirstauto, 0, &sysctl_net_ipport_check, "I", "");
SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowlast, CTLTYPE_INT|CTLFLAG_RW,
&ipport_lowlastauto, 0, &sysctl_net_ipport_check, "I", "");
SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, first, CTLTYPE_INT|CTLFLAG_RW,
&ipport_firstauto, 0, &sysctl_net_ipport_check, "I", "");
SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, last, CTLTYPE_INT|CTLFLAG_RW,
&ipport_lastauto, 0, &sysctl_net_ipport_check, "I", "");
SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hifirst, CTLTYPE_INT|CTLFLAG_RW,
&ipport_hifirstauto, 0, &sysctl_net_ipport_check, "I", "");
SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hilast, CTLTYPE_INT|CTLFLAG_RW,
&ipport_hilastauto, 0, &sysctl_net_ipport_check, "I", "");
SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, reservedhigh,
CTLFLAG_RW|CTLFLAG_SECURE, &ipport_reservedhigh, 0, "");
SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, reservedlow,
CTLFLAG_RW|CTLFLAG_SECURE, &ipport_reservedlow, 0, "");
/*
* in_pcb.c: manage the Protocol Control Blocks.
*
* NOTE: It is assumed that most of these functions will be called at
* splnet(). XXX - There are, unfortunately, a few exceptions to this
* rule that should be fixed.
*/
/*
* Allocate a PCB and associate it with the socket.
*/
int
in_pcballoc(so, pcbinfo, td)
struct socket *so;
struct inpcbinfo *pcbinfo;
struct thread *td;
{
register struct inpcb *inp;
int error;
INP_INFO_WLOCK_ASSERT(pcbinfo);
error = 0;
inp = uma_zalloc(pcbinfo->ipi_zone, M_NOWAIT | M_ZERO);
if (inp == NULL)
return (ENOBUFS);
inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
inp->inp_pcbinfo = pcbinfo;
inp->inp_socket = so;
#ifdef MAC
error = mac_init_inpcb(inp, M_NOWAIT);
if (error != 0)
goto out;
mac_create_inpcb_from_socket(so, inp);
#endif
#if defined(IPSEC) || defined(FAST_IPSEC)
#ifdef FAST_IPSEC
error = ipsec_init_policy(so, &inp->inp_sp);
#else
error = ipsec_init_pcbpolicy(so, &inp->inp_sp);
#endif
if (error != 0)
goto out;
#endif /*IPSEC*/
#if defined(INET6)
if (INP_SOCKAF(so) == AF_INET6) {
inp->inp_vflag |= INP_IPV6PROTO;
if (ip6_v6only)
inp->inp_flags |= IN6P_IPV6_V6ONLY;
}
#endif
LIST_INSERT_HEAD(pcbinfo->listhead, inp, inp_list);
pcbinfo->ipi_count++;
so->so_pcb = (caddr_t)inp;
INP_LOCK_INIT(inp, "inp");
#ifdef INET6
if (ip6_auto_flowlabel)
inp->inp_flags |= IN6P_AUTOFLOWLABEL;
#endif
#if defined(IPSEC) || defined(FAST_IPSEC) || defined(MAC)
out:
if (error != 0)
uma_zfree(pcbinfo->ipi_zone, inp);
#endif
return (error);
}
int
in_pcbbind(inp, nam, td)
register struct inpcb *inp;
struct sockaddr *nam;
struct thread *td;
{
int anonport, error;
INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
INP_LOCK_ASSERT(inp);
if (inp->inp_lport != 0 || inp->inp_laddr.s_addr != INADDR_ANY)
return (EINVAL);
anonport = inp->inp_lport == 0 && (nam == NULL ||
((struct sockaddr_in *)nam)->sin_port == 0);
error = in_pcbbind_setup(inp, nam, &inp->inp_laddr.s_addr,
&inp->inp_lport, td);
if (error)
return (error);
if (in_pcbinshash(inp) != 0) {
inp->inp_laddr.s_addr = INADDR_ANY;
inp->inp_lport = 0;
return (EAGAIN);
}
if (anonport)
inp->inp_flags |= INP_ANONPORT;
return (0);
}
/*
* Set up a bind operation on a PCB, performing port allocation
* as required, but do not actually modify the PCB. Callers can
* either complete the bind by setting inp_laddr/inp_lport and
* calling in_pcbinshash(), or they can just use the resulting
* port and address to authorise the sending of a once-off packet.
*
* On error, the values of *laddrp and *lportp are not changed.
*/
int
in_pcbbind_setup(inp, nam, laddrp, lportp, td)
struct inpcb *inp;
struct sockaddr *nam;
in_addr_t *laddrp;
u_short *lportp;
struct thread *td;
{
struct socket *so = inp->inp_socket;
unsigned short *lastport;
struct sockaddr_in *sin;
struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
struct in_addr laddr;
u_short lport = 0;
int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
int error, prison = 0;
INP_INFO_WLOCK_ASSERT(pcbinfo);
INP_LOCK_ASSERT(inp);
if (TAILQ_EMPTY(&in_ifaddrhead)) /* XXX broken! */
return (EADDRNOTAVAIL);
laddr.s_addr = *laddrp;
if (nam != NULL && laddr.s_addr != INADDR_ANY)
return (EINVAL);
if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
wild = 1;
if (nam) {
sin = (struct sockaddr_in *)nam;
if (nam->sa_len != sizeof (*sin))
return (EINVAL);
#ifdef notdef
/*
* We should check the family, but old programs
* incorrectly fail to initialize it.
*/
if (sin->sin_family != AF_INET)
return (EAFNOSUPPORT);
#endif
if (sin->sin_addr.s_addr != INADDR_ANY)
if (prison_ip(td->td_ucred, 0, &sin->sin_addr.s_addr))
return(EINVAL);
if (sin->sin_port != *lportp) {
/* Don't allow the port to change. */
if (*lportp != 0)
return (EINVAL);
lport = sin->sin_port;
}
/* NB: lport is left as 0 if the port isn't being changed. */
if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
/*
* Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
* allow complete 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 (sin->sin_addr.s_addr != INADDR_ANY) {
sin->sin_port = 0; /* yech... */
bzero(&sin->sin_zero, sizeof(sin->sin_zero));
if (ifa_ifwithaddr((struct sockaddr *)sin) == 0)
return (EADDRNOTAVAIL);
}
laddr = sin->sin_addr;
if (lport) {
struct inpcb *t;
/* GROSS */
if (ntohs(lport) <= ipport_reservedhigh &&
ntohs(lport) >= ipport_reservedlow &&
td && suser_cred(td->td_ucred, PRISON_ROOT))
return (EACCES);
if (td && jailed(td->td_ucred))
prison = 1;
if (so->so_cred->cr_uid != 0 &&
!IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
t = in_pcblookup_local(inp->inp_pcbinfo,
sin->sin_addr, lport,
prison ? 0 : INPLOOKUP_WILDCARD);
/*
* XXX
* This entire block sorely needs a rewrite.
*/
if (t && (t->inp_vflag & INP_TIMEWAIT)) {
if ((ntohl(sin->sin_addr.s_addr) != INADDR_ANY ||
ntohl(t->inp_laddr.s_addr) != INADDR_ANY ||
(intotw(t)->tw_so_options & SO_REUSEPORT) == 0) &&
(so->so_cred->cr_uid != intotw(t)->tw_cred->cr_uid))
return (EADDRINUSE);
} else
if (t &&
(ntohl(sin->sin_addr.s_addr) != INADDR_ANY ||
ntohl(t->inp_laddr.s_addr) != INADDR_ANY ||
(t->inp_socket->so_options &
SO_REUSEPORT) == 0) &&
(so->so_cred->cr_uid !=
t->inp_socket->so_cred->cr_uid)) {
#if defined(INET6)
if (ntohl(sin->sin_addr.s_addr) !=
INADDR_ANY ||
ntohl(t->inp_laddr.s_addr) !=
INADDR_ANY ||
INP_SOCKAF(so) ==
INP_SOCKAF(t->inp_socket))
#endif /* defined(INET6) */
return (EADDRINUSE);
}
}
if (prison &&
prison_ip(td->td_ucred, 0, &sin->sin_addr.s_addr))
return (EADDRNOTAVAIL);
t = in_pcblookup_local(pcbinfo, sin->sin_addr,
lport, prison ? 0 : wild);
if (t && (t->inp_vflag & INP_TIMEWAIT)) {
if ((reuseport & intotw(t)->tw_so_options) == 0)
return (EADDRINUSE);
} else
if (t &&
(reuseport & t->inp_socket->so_options) == 0) {
#if defined(INET6)
if (ntohl(sin->sin_addr.s_addr) !=
INADDR_ANY ||
ntohl(t->inp_laddr.s_addr) !=
INADDR_ANY ||
INP_SOCKAF(so) ==
INP_SOCKAF(t->inp_socket))
#endif /* defined(INET6) */
return (EADDRINUSE);
}
}
}
if (*lportp != 0)
lport = *lportp;
if (lport == 0) {
u_short first, last;
int count;
if (laddr.s_addr != INADDR_ANY)
if (prison_ip(td->td_ucred, 0, &laddr.s_addr))
return (EINVAL);
if (inp->inp_flags & INP_HIGHPORT) {
first = ipport_hifirstauto; /* sysctl */
last = ipport_hilastauto;
lastport = &pcbinfo->lasthi;
} else if (inp->inp_flags & INP_LOWPORT) {
if (td && (error = suser_cred(td->td_ucred,
PRISON_ROOT)) != 0)
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? */
return (EADDRNOTAVAIL);
--*lastport;
if (*lastport > first || *lastport < last)
*lastport = first;
lport = htons(*lastport);
} while (in_pcblookup_local(pcbinfo, laddr, lport,
wild));
} else {
/*
* counting up
*/
count = last - first;
do {
if (count-- < 0) /* completely used? */
return (EADDRNOTAVAIL);
++*lastport;
if (*lastport < first || *lastport > last)
*lastport = first;
lport = htons(*lastport);
} while (in_pcblookup_local(pcbinfo, laddr, lport,
wild));
}
}
if (prison_ip(td->td_ucred, 0, &laddr.s_addr))
return (EINVAL);
*laddrp = laddr.s_addr;
*lportp = lport;
return (0);
}
/*
* 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
in_pcbconnect(inp, nam, td)
register struct inpcb *inp;
struct sockaddr *nam;
struct thread *td;
{
u_short lport, fport;
in_addr_t laddr, faddr;
int anonport, error;
lport = inp->inp_lport;
laddr = inp->inp_laddr.s_addr;
anonport = (lport == 0);
error = in_pcbconnect_setup(inp, nam, &laddr, &lport, &faddr, &fport,
NULL, td);
if (error)
return (error);
/* Do the initial binding of the local address if required. */
if (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0) {
inp->inp_lport = lport;
inp->inp_laddr.s_addr = laddr;
if (in_pcbinshash(inp) != 0) {
inp->inp_laddr.s_addr = INADDR_ANY;
inp->inp_lport = 0;
return (EAGAIN);
}
}
/* Commit the remaining changes. */
inp->inp_lport = lport;
inp->inp_laddr.s_addr = laddr;
inp->inp_faddr.s_addr = faddr;
inp->inp_fport = fport;
in_pcbrehash(inp);
#ifdef IPSEC
if (inp->inp_socket->so_type == SOCK_STREAM)
ipsec_pcbconn(inp->inp_sp);
#endif
if (anonport)
inp->inp_flags |= INP_ANONPORT;
return (0);
}
/*
* Set up for a connect from a socket to the specified address.
* On entry, *laddrp and *lportp should contain the current local
* address and port for the PCB; these are updated to the values
* that should be placed in inp_laddr and inp_lport to complete
* the connect.
*
* On success, *faddrp and *fportp will be set to the remote address
* and port. These are not updated in the error case.
*
* If the operation fails because the connection already exists,
* *oinpp will be set to the PCB of that connection so that the
* caller can decide to override it. In all other cases, *oinpp
* is set to NULL.
*/
int
in_pcbconnect_setup(inp, nam, laddrp, lportp, faddrp, fportp, oinpp, td)
register struct inpcb *inp;
struct sockaddr *nam;
in_addr_t *laddrp;
u_short *lportp;
in_addr_t *faddrp;
u_short *fportp;
struct inpcb **oinpp;
struct thread *td;
{
struct sockaddr_in *sin = (struct sockaddr_in *)nam;
struct in_ifaddr *ia;
struct sockaddr_in sa;
struct ucred *cred;
struct inpcb *oinp;
struct in_addr laddr, faddr;
u_short lport, fport;
int error;
if (oinpp != NULL)
*oinpp = NULL;
if (nam->sa_len != sizeof (*sin))
return (EINVAL);
if (sin->sin_family != AF_INET)
return (EAFNOSUPPORT);
if (sin->sin_port == 0)
return (EADDRNOTAVAIL);
laddr.s_addr = *laddrp;
lport = *lportp;
faddr = sin->sin_addr;
fport = sin->sin_port;
cred = inp->inp_socket->so_cred;
if (laddr.s_addr == INADDR_ANY && jailed(cred)) {
bzero(&sa, sizeof(sa));
sa.sin_addr.s_addr = htonl(prison_getip(cred));
sa.sin_len = sizeof(sa);
sa.sin_family = AF_INET;
error = in_pcbbind_setup(inp, (struct sockaddr *)&sa,
&laddr.s_addr, &lport, td);
if (error)
return (error);
}
if (!TAILQ_EMPTY(&in_ifaddrhead)) {
/*
* If the destination address is INADDR_ANY,
* use the primary local address.
* If the supplied address is INADDR_BROADCAST,
* and the primary interface supports broadcast,
* choose the broadcast address for that interface.
*/
if (faddr.s_addr == INADDR_ANY)
faddr = IA_SIN(TAILQ_FIRST(&in_ifaddrhead))->sin_addr;
else if (faddr.s_addr == (u_long)INADDR_BROADCAST &&
(TAILQ_FIRST(&in_ifaddrhead)->ia_ifp->if_flags &
IFF_BROADCAST))
faddr = satosin(&TAILQ_FIRST(
&in_ifaddrhead)->ia_broadaddr)->sin_addr;
}
if (laddr.s_addr == INADDR_ANY) {
register struct route *ro;
ia = (struct in_ifaddr *)0;
/*
* If route is known or can be allocated now,
* our src addr is taken from the i/f, else punt.
* Note that we should check the address family of the cached
* destination, in case of sharing the cache with IPv6.
*/
ro = &inp->inp_route;
if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 ||
ro->ro_dst.sa_family != AF_INET ||
satosin(&ro->ro_dst)->sin_addr.s_addr != faddr.s_addr ||
inp->inp_socket->so_options & SO_DONTROUTE)) {
RTFREE(ro->ro_rt);
ro->ro_rt = (struct rtentry *)0;
}
if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0 && /*XXX*/
(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_in));
ro->ro_dst.sa_family = AF_INET;
ro->ro_dst.sa_len = sizeof(struct sockaddr_in);
((struct sockaddr_in *)&ro->ro_dst)->sin_addr = faddr;
rtalloc(ro);
}
/*
* If we found a route, use the address
* corresponding to the outgoing interface
* unless it is the loopback (in case a route
* to our address on another net goes to loopback).
*/
if (ro->ro_rt && !(ro->ro_rt->rt_ifp->if_flags & IFF_LOOPBACK))
ia = ifatoia(ro->ro_rt->rt_ifa);
if (ia == 0) {
bzero(&sa, sizeof(sa));
sa.sin_addr = faddr;
sa.sin_len = sizeof(sa);
sa.sin_family = AF_INET;
ia = ifatoia(ifa_ifwithdstaddr(sintosa(&sa)));
if (ia == 0)
ia = ifatoia(ifa_ifwithnet(sintosa(&sa)));
if (ia == 0)
ia = TAILQ_FIRST(&in_ifaddrhead);
if (ia == 0)
return (EADDRNOTAVAIL);
}
/*
* If the destination address is multicast and an outgoing
* interface has been set as a multicast option, use the
* address of that interface as our source address.
*/
if (IN_MULTICAST(ntohl(faddr.s_addr)) &&
inp->inp_moptions != NULL) {
struct ip_moptions *imo;
struct ifnet *ifp;
imo = inp->inp_moptions;
if (imo->imo_multicast_ifp != NULL) {
ifp = imo->imo_multicast_ifp;
TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link)
if (ia->ia_ifp == ifp)
break;
if (ia == 0)
return (EADDRNOTAVAIL);
}
}
laddr = ia->ia_addr.sin_addr;
}
oinp = in_pcblookup_hash(inp->inp_pcbinfo, faddr, fport, laddr, lport,
0, NULL);
if (oinp != NULL) {
if (oinpp != NULL)
*oinpp = oinp;
return (EADDRINUSE);
}
if (lport == 0) {
error = in_pcbbind_setup(inp, NULL, &laddr.s_addr, &lport, td);
if (error)
return (error);
}
*laddrp = laddr.s_addr;
*lportp = lport;
*faddrp = faddr.s_addr;
*fportp = fport;
return (0);
}
void
in_pcbdisconnect(inp)
struct inpcb *inp;
{
INP_LOCK_ASSERT(inp);
inp->inp_faddr.s_addr = INADDR_ANY;
inp->inp_fport = 0;
in_pcbrehash(inp);
if (inp->inp_socket->so_state & SS_NOFDREF)
in_pcbdetach(inp);
#ifdef IPSEC
ipsec_pcbdisconn(inp->inp_sp);
#endif
}
void
in_pcbdetach(inp)
struct inpcb *inp;
{
struct socket *so = inp->inp_socket;
struct inpcbinfo *ipi = inp->inp_pcbinfo;
INP_LOCK_ASSERT(inp);
#if defined(IPSEC) || defined(FAST_IPSEC)
ipsec4_delete_pcbpolicy(inp);
#endif /*IPSEC*/
inp->inp_gencnt = ++ipi->ipi_gencnt;
in_pcbremlists(inp);
if (so) {
so->so_pcb = 0;
sotryfree(so);
}
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;
INP_LOCK_DESTROY(inp);
#ifdef MAC
mac_destroy_inpcb(inp);
#endif
uma_zfree(ipi->ipi_zone, inp);
}
struct sockaddr *
in_sockaddr(port, addr_p)
in_port_t port;
struct in_addr *addr_p;
{
struct sockaddr_in *sin;
MALLOC(sin, struct sockaddr_in *, sizeof *sin, M_SONAME,
M_WAITOK | M_ZERO);
sin->sin_family = AF_INET;
sin->sin_len = sizeof(*sin);
sin->sin_addr = *addr_p;
sin->sin_port = port;
return (struct sockaddr *)sin;
}
/*
* The wrapper function will pass down the pcbinfo for this function to lock.
* 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
in_setsockaddr(so, nam, pcbinfo)
struct socket *so;
struct sockaddr **nam;
struct inpcbinfo *pcbinfo;
{
int s;
register struct inpcb *inp;
struct in_addr addr;
in_port_t port;
s = splnet();
INP_INFO_RLOCK(pcbinfo);
inp = sotoinpcb(so);
if (!inp) {
INP_INFO_RUNLOCK(pcbinfo);
splx(s);
return ECONNRESET;
}
INP_LOCK(inp);
port = inp->inp_lport;
addr = inp->inp_laddr;
INP_UNLOCK(inp);
INP_INFO_RUNLOCK(pcbinfo);
splx(s);
*nam = in_sockaddr(port, &addr);
return 0;
}
/*
* The wrapper function will pass down the pcbinfo for this function to lock.
*/
int
in_setpeeraddr(so, nam, pcbinfo)
struct socket *so;
struct sockaddr **nam;
struct inpcbinfo *pcbinfo;
{
int s;
register struct inpcb *inp;
struct in_addr addr;
in_port_t port;
s = splnet();
INP_INFO_RLOCK(pcbinfo);
inp = sotoinpcb(so);
if (!inp) {
INP_INFO_RUNLOCK(pcbinfo);
splx(s);
return ECONNRESET;
}
INP_LOCK(inp);
port = inp->inp_fport;
addr = inp->inp_faddr;
INP_UNLOCK(inp);
INP_INFO_RUNLOCK(pcbinfo);
splx(s);
*nam = in_sockaddr(port, &addr);
return 0;
}
void
in_pcbnotifyall(pcbinfo, faddr, errno, notify)
struct inpcbinfo *pcbinfo;
struct in_addr faddr;
int errno;
struct inpcb *(*notify)(struct inpcb *, int);
{
struct inpcb *inp, *ninp;
struct inpcbhead *head;
int s;
s = splnet();
INP_INFO_WLOCK(pcbinfo);
head = pcbinfo->listhead;
for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) {
INP_LOCK(inp);
ninp = LIST_NEXT(inp, inp_list);
#ifdef INET6
if ((inp->inp_vflag & INP_IPV4) == 0) {
INP_UNLOCK(inp);
continue;
}
#endif
if (inp->inp_faddr.s_addr != faddr.s_addr ||
inp->inp_socket == NULL) {
INP_UNLOCK(inp);
continue;
}
if ((*notify)(inp, errno))
INP_UNLOCK(inp);
}
INP_INFO_WUNLOCK(pcbinfo);
splx(s);
}
void
in_pcbpurgeif0(pcbinfo, ifp)
struct inpcbinfo *pcbinfo;
struct ifnet *ifp;
{
struct inpcb *inp;
struct ip_moptions *imo;
int i, gap;
/* why no splnet here? XXX */
INP_INFO_RLOCK(pcbinfo);
LIST_FOREACH(inp, pcbinfo->listhead, inp_list) {
INP_LOCK(inp);
imo = inp->inp_moptions;
if ((inp->inp_vflag & INP_IPV4) &&
imo != NULL) {
/*
* Unselect the outgoing interface if it is being
* detached.
*/
if (imo->imo_multicast_ifp == ifp)
imo->imo_multicast_ifp = NULL;
/*
* Drop multicast group membership if we joined
* through the interface being detached.
*/
for (i = 0, gap = 0; i < imo->imo_num_memberships;
i++) {
if (imo->imo_membership[i]->inm_ifp == ifp) {
in_delmulti(imo->imo_membership[i]);
gap++;
} else if (gap != 0)
imo->imo_membership[i - gap] =
imo->imo_membership[i];
}
imo->imo_num_memberships -= gap;
}
INP_UNLOCK(inp);
}
INP_INFO_RUNLOCK(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
in_losing(inp)
struct inpcb *inp;
{
register struct rtentry *rt;
struct rt_addrinfo info;
INP_LOCK_ASSERT(inp);
if ((rt = inp->inp_route.ro_rt)) {
RT_LOCK(rt);
inp->inp_route.ro_rt = NULL;
bzero((caddr_t)&info, sizeof(info));
info.rti_flags = rt->rt_flags;
info.rti_info[RTAX_DST] = rt_key(rt);
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)
rtexpunge(rt);
RTFREE_LOCKED(rt);
/*
* A new route can be allocated
* the next time output is attempted.
*/
}
}
/*
* After a routing change, flush old routing
* and allocate a (hopefully) better one.
*/
struct inpcb *
in_rtchange(inp, errno)
register struct inpcb *inp;
int errno;
{
INP_LOCK_ASSERT(inp);
if (inp->inp_route.ro_rt) {
RTFREE(inp->inp_route.ro_rt);
inp->inp_route.ro_rt = 0;
/*
* A new route can be allocated the next time
* output is attempted.
*/
}
return inp;
}
/*
* Lookup a PCB based on the local address and port.
*/
struct inpcb *
in_pcblookup_local(pcbinfo, laddr, lport_arg, wild_okay)
struct inpcbinfo *pcbinfo;
struct in_addr laddr;
u_int lport_arg;
int wild_okay;
{
register struct inpcb *inp;
int matchwild = 3, wildcard;
u_short lport = lport_arg;
INP_INFO_WLOCK_ASSERT(pcbinfo);
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) {
#ifdef INET6
if ((inp->inp_vflag & INP_IPV4) == 0)
continue;
#endif
if (inp->inp_faddr.s_addr == INADDR_ANY &&
inp->inp_laddr.s_addr == laddr.s_addr &&
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.
*/
retrylookup:
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;
#ifdef INET6
if ((inp->inp_vflag & INP_IPV4) == 0)
continue;
#endif
/*
* Clean out old time_wait sockets if they
* are clogging up needed local ports.
*/
if ((inp->inp_vflag & INP_TIMEWAIT) != 0) {
if (tcp_twrecycleable((struct tcptw *)inp->inp_ppcb)) {
INP_LOCK(inp);
tcp_twclose((struct tcptw *)inp->inp_ppcb, 0);
match = NULL;
goto retrylookup;
}
}
if (inp->inp_faddr.s_addr != INADDR_ANY)
wildcard++;
if (inp->inp_laddr.s_addr != INADDR_ANY) {
if (laddr.s_addr == INADDR_ANY)
wildcard++;
else if (inp->inp_laddr.s_addr != laddr.s_addr)
continue;
} else {
if (laddr.s_addr != INADDR_ANY)
wildcard++;
}
if (wildcard < matchwild) {
match = inp;
matchwild = wildcard;
if (matchwild == 0) {
break;
}
}
}
}
return (match);
}
}
/*
* Lookup PCB in hash list.
*/
struct inpcb *
in_pcblookup_hash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard,
ifp)
struct inpcbinfo *pcbinfo;
struct in_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;
INP_INFO_RLOCK_ASSERT(pcbinfo);
/*
* First look for an exact match.
*/
head = &pcbinfo->hashbase[INP_PCBHASH(faddr.s_addr, lport, fport, pcbinfo->hashmask)];
LIST_FOREACH(inp, head, inp_hash) {
#ifdef INET6
if ((inp->inp_vflag & INP_IPV4) == 0)
continue;
#endif
if (inp->inp_faddr.s_addr == faddr.s_addr &&
inp->inp_laddr.s_addr == laddr.s_addr &&
inp->inp_fport == fport &&
inp->inp_lport == lport) {
/*
* Found.
*/
return (inp);
}
}
if (wildcard) {
struct inpcb *local_wild = NULL;
#if defined(INET6)
struct inpcb *local_wild_mapped = NULL;
#endif /* defined(INET6) */
head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, pcbinfo->hashmask)];
LIST_FOREACH(inp, head, inp_hash) {
#ifdef INET6
if ((inp->inp_vflag & INP_IPV4) == 0)
continue;
#endif
if (inp->inp_faddr.s_addr == INADDR_ANY &&
inp->inp_lport == lport) {
if (ifp && ifp->if_type == IFT_FAITH &&
(inp->inp_flags & INP_FAITH) == 0)
continue;
if (inp->inp_laddr.s_addr == laddr.s_addr)
return (inp);
else if (inp->inp_laddr.s_addr == INADDR_ANY) {
#if defined(INET6)
if (INP_CHECK_SOCKAF(inp->inp_socket,
AF_INET6))
local_wild_mapped = inp;
else
#endif /* defined(INET6) */
local_wild = inp;
}
}
}
#if defined(INET6)
if (local_wild == NULL)
return (local_wild_mapped);
#endif /* defined(INET6) */
return (local_wild);
}
/*
* Not found.
*/
return (NULL);
}
/*
* Insert PCB onto various hash lists.
*/
int
in_pcbinshash(inp)
struct inpcb *inp;
{
struct inpcbhead *pcbhash;
struct inpcbporthead *pcbporthash;
struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
struct inpcbport *phd;
u_int32_t hashkey_faddr;
INP_INFO_WLOCK_ASSERT(pcbinfo);
#ifdef INET6
if (inp->inp_vflag & INP_IPV6)
hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
else
#endif /* INET6 */
hashkey_faddr = inp->inp_faddr.s_addr;
pcbhash = &pcbinfo->hashbase[INP_PCBHASH(hashkey_faddr,
inp->inp_lport, inp->inp_fport, pcbinfo->hashmask)];
pcbporthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(inp->inp_lport,
pcbinfo->porthashmask)];
/*
* Go through port list and look for a head for this lport.
*/
LIST_FOREACH(phd, pcbporthash, phd_hash) {
if (phd->phd_port == inp->inp_lport)
break;
}
/*
* If none exists, malloc one and tack it on.
*/
if (phd == NULL) {
MALLOC(phd, struct inpcbport *, sizeof(struct inpcbport), M_PCB, M_NOWAIT);
if (phd == NULL) {
return (ENOBUFS); /* XXX */
}
phd->phd_port = inp->inp_lport;
LIST_INIT(&phd->phd_pcblist);
LIST_INSERT_HEAD(pcbporthash, phd, phd_hash);
}
inp->inp_phd = phd;
LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist);
LIST_INSERT_HEAD(pcbhash, inp, inp_hash);
return (0);
}
/*
* Move PCB to the proper hash bucket when { faddr, fport } have been
* changed. NOTE: This does not handle the case of the lport changing (the
* hashed port list would have to be updated as well), so the lport must
* not change after in_pcbinshash() has been called.
*/
void
in_pcbrehash(inp)
struct inpcb *inp;
{
struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
struct inpcbhead *head;
u_int32_t hashkey_faddr;
INP_INFO_WLOCK_ASSERT(pcbinfo);
/* XXX? INP_LOCK_ASSERT(inp); */
#ifdef INET6
if (inp->inp_vflag & INP_IPV6)
hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
else
#endif /* INET6 */
hashkey_faddr = inp->inp_faddr.s_addr;
head = &pcbinfo->hashbase[INP_PCBHASH(hashkey_faddr,
inp->inp_lport, inp->inp_fport, pcbinfo->hashmask)];
LIST_REMOVE(inp, inp_hash);
LIST_INSERT_HEAD(head, inp, inp_hash);
}
/*
* Remove PCB from various lists.
*/
void
in_pcbremlists(inp)
struct inpcb *inp;
{
struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
INP_INFO_WLOCK_ASSERT(pcbinfo);
INP_LOCK_ASSERT(inp);
inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
if (inp->inp_lport) {
struct inpcbport *phd = inp->inp_phd;
LIST_REMOVE(inp, inp_hash);
LIST_REMOVE(inp, inp_portlist);
if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
LIST_REMOVE(phd, phd_hash);
free(phd, M_PCB);
}
}
LIST_REMOVE(inp, inp_list);
pcbinfo->ipi_count--;
}
/*
* A set label operation has occurred at the socket layer, propagate the
* label change into the in_pcb for the socket.
*/
void
in_pcbsosetlabel(so)
struct socket *so;
{
#ifdef MAC
struct inpcb *inp;
/* XXX: Will assert socket lock when we have them. */
inp = (struct inpcb *)so->so_pcb;
INP_LOCK(inp);
mac_inpcb_sosetlabel(so, inp);
INP_UNLOCK(inp);
#endif
}
int
prison_xinpcb(struct thread *td, struct inpcb *inp)
{
if (!jailed(td->td_ucred))
return (0);
if (ntohl(inp->inp_laddr.s_addr) == prison_getip(td->td_ucred))
return (0);
return (1);
}
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