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freebsd-skq/sys/netinet/in.c
Qing Li b3664a14cc Exclude host routes when checking for prefix coverage on multiple 
interfaces. A host route has a NULL mask so check for that condition.
I have also been told by developers who customize the packet output
path with direct manipulation of the route entry (or the outgoing
interface to be specific). This patch checks for the route mask
explicitly to make sure custom code will not panic.

PR:		kern/161805
MFC after:	3 days
2011-10-25 04:06:29 +00:00

1656 lines
42 KiB
C
Raw Blame History

/*-
* Copyright (c) 1982, 1986, 1991, 1993
* The Regents of the University of California. All rights reserved.
* Copyright (C) 2001 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.
* 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.c 8.4 (Berkeley) 1/9/95
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_mpath.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sockio.h>
#include <sys/malloc.h>
#include <sys/priv.h>
#include <sys/socket.h>
#include <sys/jail.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/sysctl.h>
#include <sys/syslog.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_arp.h>
#include <net/if_dl.h>
#include <net/if_llatbl.h>
#include <net/if_types.h>
#include <net/route.h>
#include <net/vnet.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/in_pcb.h>
#include <netinet/ip_var.h>
#include <netinet/igmp_var.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>
static int in_mask2len(struct in_addr *);
static void in_len2mask(struct in_addr *, int);
static int in_lifaddr_ioctl(struct socket *, u_long, caddr_t,
struct ifnet *, struct thread *);
static int in_addprefix(struct in_ifaddr *, int);
static int in_scrubprefix(struct in_ifaddr *, u_int);
static void in_socktrim(struct sockaddr_in *);
static int in_ifinit(struct ifnet *,
struct in_ifaddr *, struct sockaddr_in *, int);
static void in_purgemaddrs(struct ifnet *);
static VNET_DEFINE(int, sameprefixcarponly);
#define V_sameprefixcarponly VNET(sameprefixcarponly)
SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, same_prefix_carp_only, CTLFLAG_RW,
&VNET_NAME(sameprefixcarponly), 0,
"Refuse to create same prefixes on different interfaces");
VNET_DECLARE(struct inpcbinfo, ripcbinfo);
#define V_ripcbinfo VNET(ripcbinfo)
VNET_DECLARE(struct arpstat, arpstat); /* ARP statistics, see if_arp.h */
#define V_arpstat VNET(arpstat)
/*
* Return 1 if an internet address is for a ``local'' host
* (one to which we have a connection).
*/
int
in_localaddr(struct in_addr in)
{
register u_long i = ntohl(in.s_addr);
register struct in_ifaddr *ia;
IN_IFADDR_RLOCK();
TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
if ((i & ia->ia_subnetmask) == ia->ia_subnet) {
IN_IFADDR_RUNLOCK();
return (1);
}
}
IN_IFADDR_RUNLOCK();
return (0);
}
/*
* Return 1 if an internet address is for the local host and configured
* on one of its interfaces.
*/
int
in_localip(struct in_addr in)
{
struct in_ifaddr *ia;
IN_IFADDR_RLOCK();
LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) {
if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) {
IN_IFADDR_RUNLOCK();
return (1);
}
}
IN_IFADDR_RUNLOCK();
return (0);
}
/*
* Determine whether an IP address is in a reserved set of addresses
* that may not be forwarded, or whether datagrams to that destination
* may be forwarded.
*/
int
in_canforward(struct in_addr in)
{
register u_long i = ntohl(in.s_addr);
register u_long net;
if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i))
return (0);
if (IN_CLASSA(i)) {
net = i & IN_CLASSA_NET;
if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT))
return (0);
}
return (1);
}
/*
* Trim a mask in a sockaddr
*/
static void
in_socktrim(struct sockaddr_in *ap)
{
register char *cplim = (char *) &ap->sin_addr;
register char *cp = (char *) (&ap->sin_addr + 1);
ap->sin_len = 0;
while (--cp >= cplim)
if (*cp) {
(ap)->sin_len = cp - (char *) (ap) + 1;
break;
}
}
static int
in_mask2len(mask)
struct in_addr *mask;
{
int x, y;
u_char *p;
p = (u_char *)mask;
for (x = 0; x < sizeof(*mask); x++) {
if (p[x] != 0xff)
break;
}
y = 0;
if (x < sizeof(*mask)) {
for (y = 0; y < 8; y++) {
if ((p[x] & (0x80 >> y)) == 0)
break;
}
}
return (x * 8 + y);
}
static void
in_len2mask(struct in_addr *mask, int len)
{
int i;
u_char *p;
p = (u_char *)mask;
bzero(mask, sizeof(*mask));
for (i = 0; i < len / 8; i++)
p[i] = 0xff;
if (len % 8)
p[i] = (0xff00 >> (len % 8)) & 0xff;
}
/*
* Generic internet control operations (ioctl's).
*
* ifp is NULL if not an interface-specific ioctl.
*/
/* ARGSUSED */
int
in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
struct thread *td)
{
register struct ifreq *ifr = (struct ifreq *)data;
register struct in_ifaddr *ia, *iap;
register struct ifaddr *ifa;
struct in_addr allhosts_addr;
struct in_addr dst;
struct in_ifinfo *ii;
struct in_aliasreq *ifra = (struct in_aliasreq *)data;
struct sockaddr_in oldaddr;
int error, hostIsNew, iaIsNew, maskIsNew;
int iaIsFirst;
ia = NULL;
iaIsFirst = 0;
iaIsNew = 0;
allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
/*
* Filter out ioctls we implement directly; forward the rest on to
* in_lifaddr_ioctl() and ifp->if_ioctl().
*/
switch (cmd) {
case SIOCAIFADDR:
case SIOCDIFADDR:
case SIOCGIFADDR:
case SIOCGIFBRDADDR:
case SIOCGIFDSTADDR:
case SIOCGIFNETMASK:
case SIOCSIFADDR:
case SIOCSIFBRDADDR:
case SIOCSIFDSTADDR:
case SIOCSIFNETMASK:
break;
case SIOCALIFADDR:
if (td != NULL) {
error = priv_check(td, PRIV_NET_ADDIFADDR);
if (error)
return (error);
}
if (ifp == NULL)
return (EINVAL);
return in_lifaddr_ioctl(so, cmd, data, ifp, td);
case SIOCDLIFADDR:
if (td != NULL) {
error = priv_check(td, PRIV_NET_DELIFADDR);
if (error)
return (error);
}
if (ifp == NULL)
return (EINVAL);
return in_lifaddr_ioctl(so, cmd, data, ifp, td);
case SIOCGLIFADDR:
if (ifp == NULL)
return (EINVAL);
return in_lifaddr_ioctl(so, cmd, data, ifp, td);
default:
if (ifp == NULL || ifp->if_ioctl == NULL)
return (EOPNOTSUPP);
return ((*ifp->if_ioctl)(ifp, cmd, data));
}
if (ifp == NULL)
return (EADDRNOTAVAIL);
/*
* Security checks before we get involved in any work.
*/
switch (cmd) {
case SIOCAIFADDR:
case SIOCSIFADDR:
case SIOCSIFBRDADDR:
case SIOCSIFNETMASK:
case SIOCSIFDSTADDR:
if (td != NULL) {
error = priv_check(td, PRIV_NET_ADDIFADDR);
if (error)
return (error);
}
break;
case SIOCDIFADDR:
if (td != NULL) {
error = priv_check(td, PRIV_NET_DELIFADDR);
if (error)
return (error);
}
break;
}
/*
* Find address for this interface, if it exists.
*
* If an alias address was specified, find that one instead of the
* first one on the interface, if possible.
*/
dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr;
IN_IFADDR_RLOCK();
LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash) {
if (iap->ia_ifp == ifp &&
iap->ia_addr.sin_addr.s_addr == dst.s_addr) {
if (td == NULL || prison_check_ip4(td->td_ucred,
&dst) == 0)
ia = iap;
break;
}
}
if (ia != NULL)
ifa_ref(&ia->ia_ifa);
IN_IFADDR_RUNLOCK();
if (ia == NULL) {
IF_ADDR_LOCK(ifp);
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
iap = ifatoia(ifa);
if (iap->ia_addr.sin_family == AF_INET) {
if (td != NULL &&
prison_check_ip4(td->td_ucred,
&iap->ia_addr.sin_addr) != 0)
continue;
ia = iap;
break;
}
}
if (ia != NULL)
ifa_ref(&ia->ia_ifa);
IF_ADDR_UNLOCK(ifp);
}
if (ia == NULL)
iaIsFirst = 1;
error = 0;
switch (cmd) {
case SIOCAIFADDR:
case SIOCDIFADDR:
if (ifra->ifra_addr.sin_family == AF_INET) {
struct in_ifaddr *oia;
IN_IFADDR_RLOCK();
for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) {
if (ia->ia_ifp == ifp &&
ia->ia_addr.sin_addr.s_addr ==
ifra->ifra_addr.sin_addr.s_addr)
break;
}
if (ia != NULL && ia != oia)
ifa_ref(&ia->ia_ifa);
if (oia != NULL && ia != oia)
ifa_free(&oia->ia_ifa);
IN_IFADDR_RUNLOCK();
if ((ifp->if_flags & IFF_POINTOPOINT)
&& (cmd == SIOCAIFADDR)
&& (ifra->ifra_dstaddr.sin_addr.s_addr
== INADDR_ANY)) {
error = EDESTADDRREQ;
goto out;
}
}
if (cmd == SIOCDIFADDR && ia == NULL) {
error = EADDRNOTAVAIL;
goto out;
}
/* FALLTHROUGH */
case SIOCSIFADDR:
case SIOCSIFNETMASK:
case SIOCSIFDSTADDR:
if (ia == NULL) {
ia = (struct in_ifaddr *)
malloc(sizeof *ia, M_IFADDR, M_NOWAIT |
M_ZERO);
if (ia == NULL) {
error = ENOBUFS;
goto out;
}
ifa = &ia->ia_ifa;
ifa_init(ifa);
ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
ia->ia_sockmask.sin_len = 8;
ia->ia_sockmask.sin_family = AF_INET;
if (ifp->if_flags & IFF_BROADCAST) {
ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr);
ia->ia_broadaddr.sin_family = AF_INET;
}
ia->ia_ifp = ifp;
ifa_ref(ifa); /* if_addrhead */
IF_ADDR_LOCK(ifp);
TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
IF_ADDR_UNLOCK(ifp);
ifa_ref(ifa); /* in_ifaddrhead */
IN_IFADDR_WLOCK();
TAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link);
IN_IFADDR_WUNLOCK();
iaIsNew = 1;
}
break;
case SIOCSIFBRDADDR:
case SIOCGIFADDR:
case SIOCGIFNETMASK:
case SIOCGIFDSTADDR:
case SIOCGIFBRDADDR:
if (ia == NULL) {
error = EADDRNOTAVAIL;
goto out;
}
break;
}
/*
* Most paths in this switch return directly or via out. Only paths
* that remove the address break in order to hit common removal code.
*/
switch (cmd) {
case SIOCGIFADDR:
*((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr;
goto out;
case SIOCGIFBRDADDR:
if ((ifp->if_flags & IFF_BROADCAST) == 0) {
error = EINVAL;
goto out;
}
*((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr;
goto out;
case SIOCGIFDSTADDR:
if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
error = EINVAL;
goto out;
}
*((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr;
goto out;
case SIOCGIFNETMASK:
*((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask;
goto out;
case SIOCSIFDSTADDR:
if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
error = EINVAL;
goto out;
}
oldaddr = ia->ia_dstaddr;
ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr;
if (ifp->if_ioctl != NULL) {
error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR,
(caddr_t)ia);
if (error) {
ia->ia_dstaddr = oldaddr;
goto out;
}
}
if (ia->ia_flags & IFA_ROUTE) {
ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr;
rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
ia->ia_ifa.ifa_dstaddr =
(struct sockaddr *)&ia->ia_dstaddr;
rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP);
}
goto out;
case SIOCSIFBRDADDR:
if ((ifp->if_flags & IFF_BROADCAST) == 0) {
error = EINVAL;
goto out;
}
ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr;
goto out;
case SIOCSIFADDR:
error = in_ifinit(ifp, ia,
(struct sockaddr_in *) &ifr->ifr_addr, 1);
if (error != 0 && iaIsNew)
break;
if (error == 0) {
ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
if (iaIsFirst &&
(ifp->if_flags & IFF_MULTICAST) != 0) {
error = in_joingroup(ifp, &allhosts_addr,
NULL, &ii->ii_allhosts);
}
EVENTHANDLER_INVOKE(ifaddr_event, ifp);
}
error = 0;
goto out;
case SIOCSIFNETMASK:
ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr;
ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
goto out;
case SIOCAIFADDR:
maskIsNew = 0;
hostIsNew = 1;
error = 0;
if (ia->ia_addr.sin_family == AF_INET) {
if (ifra->ifra_addr.sin_len == 0) {
ifra->ifra_addr = ia->ia_addr;
hostIsNew = 0;
} else if (ifra->ifra_addr.sin_addr.s_addr ==
ia->ia_addr.sin_addr.s_addr)
hostIsNew = 0;
}
if (ifra->ifra_mask.sin_len) {
/*
* QL: XXX
* Need to scrub the prefix here in case
* the issued command is SIOCAIFADDR with
* the same address, but with a different
* prefix length. And if the prefix length
* is the same as before, then the call is
* un-necessarily executed here.
*/
in_ifscrub(ifp, ia, LLE_STATIC);
ia->ia_sockmask = ifra->ifra_mask;
ia->ia_sockmask.sin_family = AF_INET;
ia->ia_subnetmask =
ntohl(ia->ia_sockmask.sin_addr.s_addr);
maskIsNew = 1;
}
if ((ifp->if_flags & IFF_POINTOPOINT) &&
(ifra->ifra_dstaddr.sin_family == AF_INET)) {
in_ifscrub(ifp, ia, LLE_STATIC);
ia->ia_dstaddr = ifra->ifra_dstaddr;
maskIsNew = 1; /* We lie; but the effect's the same */
}
if (ifra->ifra_addr.sin_family == AF_INET &&
(hostIsNew || maskIsNew))
error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0);
if (error != 0 && iaIsNew)
break;
if ((ifp->if_flags & IFF_BROADCAST) &&
(ifra->ifra_broadaddr.sin_family == AF_INET))
ia->ia_broadaddr = ifra->ifra_broadaddr;
if (error == 0) {
ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
if (iaIsFirst &&
(ifp->if_flags & IFF_MULTICAST) != 0) {
error = in_joingroup(ifp, &allhosts_addr,
NULL, &ii->ii_allhosts);
}
EVENTHANDLER_INVOKE(ifaddr_event, ifp);
}
goto out;
case SIOCDIFADDR:
/*
* in_ifscrub kills the interface route.
*/
in_ifscrub(ifp, ia, LLE_STATIC);
/*
* in_ifadown gets rid of all the rest of
* the routes. This is not quite the right
* thing to do, but at least if we are running
* a routing process they will come back.
*/
in_ifadown(&ia->ia_ifa, 1);
EVENTHANDLER_INVOKE(ifaddr_event, ifp);
error = 0;
break;
default:
panic("in_control: unsupported ioctl");
}
IF_ADDR_LOCK(ifp);
/* Re-check that ia is still part of the list. */
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
if (ifa == &ia->ia_ifa)
break;
}
if (ifa == NULL) {
/*
* If we lost the race with another thread, there is no need to
* try it again for the next loop as there is no other exit
* path between here and out.
*/
IF_ADDR_UNLOCK(ifp);
error = EADDRNOTAVAIL;
goto out;
}
TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
IF_ADDR_UNLOCK(ifp);
ifa_free(&ia->ia_ifa); /* if_addrhead */
IN_IFADDR_WLOCK();
TAILQ_REMOVE(&V_in_ifaddrhead, ia, ia_link);
if (ia->ia_addr.sin_family == AF_INET) {
struct in_ifaddr *if_ia;
LIST_REMOVE(ia, ia_hash);
IN_IFADDR_WUNLOCK();
/*
* If this is the last IPv4 address configured on this
* interface, leave the all-hosts group.
* No state-change report need be transmitted.
*/
if_ia = NULL;
IFP_TO_IA(ifp, if_ia);
if (if_ia == NULL) {
ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
IN_MULTI_LOCK();
if (ii->ii_allhosts) {
(void)in_leavegroup_locked(ii->ii_allhosts,
NULL);
ii->ii_allhosts = NULL;
}
IN_MULTI_UNLOCK();
} else
ifa_free(&if_ia->ia_ifa);
} else
IN_IFADDR_WUNLOCK();
ifa_free(&ia->ia_ifa); /* in_ifaddrhead */
out:
if (ia != NULL)
ifa_free(&ia->ia_ifa);
return (error);
}
/*
* SIOC[GAD]LIFADDR.
* SIOCGLIFADDR: get first address. (?!?)
* SIOCGLIFADDR with IFLR_PREFIX:
* get first address that matches the specified prefix.
* SIOCALIFADDR: add the specified address.
* SIOCALIFADDR with IFLR_PREFIX:
* EINVAL since we can't deduce hostid part of the address.
* SIOCDLIFADDR: delete the specified address.
* SIOCDLIFADDR with IFLR_PREFIX:
* delete the first address that matches the specified prefix.
* return values:
* EINVAL on invalid parameters
* EADDRNOTAVAIL on prefix match failed/specified address not found
* other values may be returned from in_ioctl()
*/
static int
in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data,
struct ifnet *ifp, struct thread *td)
{
struct if_laddrreq *iflr = (struct if_laddrreq *)data;
struct ifaddr *ifa;
/* sanity checks */
if (data == NULL || ifp == NULL) {
panic("invalid argument to in_lifaddr_ioctl");
/*NOTRECHED*/
}
switch (cmd) {
case SIOCGLIFADDR:
/* address must be specified on GET with IFLR_PREFIX */
if ((iflr->flags & IFLR_PREFIX) == 0)
break;
/*FALLTHROUGH*/
case SIOCALIFADDR:
case SIOCDLIFADDR:
/* address must be specified on ADD and DELETE */
if (iflr->addr.ss_family != AF_INET)
return (EINVAL);
if (iflr->addr.ss_len != sizeof(struct sockaddr_in))
return (EINVAL);
/* XXX need improvement */
if (iflr->dstaddr.ss_family
&& iflr->dstaddr.ss_family != AF_INET)
return (EINVAL);
if (iflr->dstaddr.ss_family
&& iflr->dstaddr.ss_len != sizeof(struct sockaddr_in))
return (EINVAL);
break;
default: /*shouldn't happen*/
return (EOPNOTSUPP);
}
if (sizeof(struct in_addr) * 8 < iflr->prefixlen)
return (EINVAL);
switch (cmd) {
case SIOCALIFADDR:
{
struct in_aliasreq ifra;
if (iflr->flags & IFLR_PREFIX)
return (EINVAL);
/* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
bzero(&ifra, sizeof(ifra));
bcopy(iflr->iflr_name, ifra.ifra_name,
sizeof(ifra.ifra_name));
bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len);
if (iflr->dstaddr.ss_family) { /*XXX*/
bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
iflr->dstaddr.ss_len);
}
ifra.ifra_mask.sin_family = AF_INET;
ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in);
in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen);
return (in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td));
}
case SIOCGLIFADDR:
case SIOCDLIFADDR:
{
struct in_ifaddr *ia;
struct in_addr mask, candidate, match;
struct sockaddr_in *sin;
bzero(&mask, sizeof(mask));
bzero(&match, sizeof(match));
if (iflr->flags & IFLR_PREFIX) {
/* lookup a prefix rather than address. */
in_len2mask(&mask, iflr->prefixlen);
sin = (struct sockaddr_in *)&iflr->addr;
match.s_addr = sin->sin_addr.s_addr;
match.s_addr &= mask.s_addr;
/* if you set extra bits, that's wrong */
if (match.s_addr != sin->sin_addr.s_addr)
return (EINVAL);
} else {
/* on getting an address, take the 1st match */
/* on deleting an address, do exact match */
if (cmd != SIOCGLIFADDR) {
in_len2mask(&mask, 32);
sin = (struct sockaddr_in *)&iflr->addr;
match.s_addr = sin->sin_addr.s_addr;
}
}
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
if (match.s_addr == 0)
break;
candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr;
candidate.s_addr &= mask.s_addr;
if (candidate.s_addr == match.s_addr)
break;
}
if (ifa == NULL)
return (EADDRNOTAVAIL);
ia = (struct in_ifaddr *)ifa;
if (cmd == SIOCGLIFADDR) {
/* fill in the if_laddrreq structure */
bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len);
if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
ia->ia_dstaddr.sin_len);
} else
bzero(&iflr->dstaddr, sizeof(iflr->dstaddr));
iflr->prefixlen =
in_mask2len(&ia->ia_sockmask.sin_addr);
iflr->flags = 0; /*XXX*/
return (0);
} else {
struct in_aliasreq ifra;
/* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
bzero(&ifra, sizeof(ifra));
bcopy(iflr->iflr_name, ifra.ifra_name,
sizeof(ifra.ifra_name));
bcopy(&ia->ia_addr, &ifra.ifra_addr,
ia->ia_addr.sin_len);
if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
ia->ia_dstaddr.sin_len);
}
bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr,
ia->ia_sockmask.sin_len);
return (in_control(so, SIOCDIFADDR, (caddr_t)&ifra,
ifp, td));
}
}
}
return (EOPNOTSUPP); /*just for safety*/
}
/*
* Delete any existing route for an interface.
*/
void
in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia, u_int flags)
{
in_scrubprefix(ia, flags);
}
/*
* Initialize an interface's internet address
* and routing table entry.
*/
static int
in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, struct sockaddr_in *sin,
int scrub)
{
register u_long i = ntohl(sin->sin_addr.s_addr);
struct sockaddr_in oldaddr;
int flags = RTF_UP, error = 0;
oldaddr = ia->ia_addr;
if (oldaddr.sin_family == AF_INET)
LIST_REMOVE(ia, ia_hash);
ia->ia_addr = *sin;
if (ia->ia_addr.sin_family == AF_INET) {
IN_IFADDR_WLOCK();
LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr),
ia, ia_hash);
IN_IFADDR_WUNLOCK();
}
/*
* Give the interface a chance to initialize
* if this is its first address,
* and to validate the address if necessary.
*/
if (ifp->if_ioctl != NULL) {
error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
if (error) {
/* LIST_REMOVE(ia, ia_hash) is done in in_control */
ia->ia_addr = oldaddr;
IN_IFADDR_WLOCK();
if (ia->ia_addr.sin_family == AF_INET)
LIST_INSERT_HEAD(INADDR_HASH(
ia->ia_addr.sin_addr.s_addr), ia, ia_hash);
else
/*
* If oldaddr family is not AF_INET (e.g.
* interface has been just created) in_control
* does not call LIST_REMOVE, and we end up
* with bogus ia entries in hash
*/
LIST_REMOVE(ia, ia_hash);
IN_IFADDR_WUNLOCK();
return (error);
}
}
if (scrub) {
ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
in_ifscrub(ifp, ia, LLE_STATIC);
ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
}
/*
* Be compatible with network classes, if netmask isn't supplied,
* guess it based on classes.
*/
if (ia->ia_subnetmask == 0) {
if (IN_CLASSA(i))
ia->ia_subnetmask = IN_CLASSA_NET;
else if (IN_CLASSB(i))
ia->ia_subnetmask = IN_CLASSB_NET;
else
ia->ia_subnetmask = IN_CLASSC_NET;
ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
}
ia->ia_subnet = i & ia->ia_subnetmask;
in_socktrim(&ia->ia_sockmask);
/*
* XXX: carp(4) does not have interface route
*/
if (ifp->if_type == IFT_CARP)
return (0);
/*
* Add route for the network.
*/
ia->ia_ifa.ifa_metric = ifp->if_metric;
if (ifp->if_flags & IFF_BROADCAST) {
if (ia->ia_subnetmask == IN_RFC3021_MASK)
ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST;
else
ia->ia_broadaddr.sin_addr.s_addr =
htonl(ia->ia_subnet | ~ia->ia_subnetmask);
} else if (ifp->if_flags & IFF_LOOPBACK) {
ia->ia_dstaddr = ia->ia_addr;
flags |= RTF_HOST;
} else if (ifp->if_flags & IFF_POINTOPOINT) {
if (ia->ia_dstaddr.sin_family != AF_INET)
return (0);
flags |= RTF_HOST;
}
if ((error = in_addprefix(ia, flags)) != 0)
return (error);
if (ia->ia_addr.sin_addr.s_addr == INADDR_ANY)
return (0);
if (ifp->if_flags & IFF_POINTOPOINT) {
if (ia->ia_dstaddr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr)
return (0);
}
/*
* add a loopback route to self
*/
if (V_useloopback && !(ifp->if_flags & IFF_LOOPBACK)) {
struct route ia_ro;
bzero(&ia_ro, sizeof(ia_ro));
*((struct sockaddr_in *)(&ia_ro.ro_dst)) = ia->ia_addr;
rtalloc_ign_fib(&ia_ro, 0, 0);
if ((ia_ro.ro_rt != NULL) && (ia_ro.ro_rt->rt_ifp != NULL) &&
(ia_ro.ro_rt->rt_ifp == V_loif)) {
RT_LOCK(ia_ro.ro_rt);
RT_ADDREF(ia_ro.ro_rt);
RTFREE_LOCKED(ia_ro.ro_rt);
} else
error = ifa_add_loopback_route((struct ifaddr *)ia,
(struct sockaddr *)&ia->ia_addr);
if (error == 0)
ia->ia_flags |= IFA_RTSELF;
if (ia_ro.ro_rt != NULL)
RTFREE(ia_ro.ro_rt);
}
return (error);
}
#define rtinitflags(x) \
((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \
? RTF_HOST : 0)
/*
* Generate a routing message when inserting or deleting
* an interface address alias.
*/
static void in_addralias_rtmsg(int cmd, struct in_addr *prefix,
struct in_ifaddr *target)
{
struct route pfx_ro;
struct sockaddr_in *pfx_addr;
struct rtentry msg_rt;
/* QL: XXX
* This is a bit questionable because there is no
* additional route entry added/deleted for an address
* alias. Therefore this route report is inaccurate.
*/
bzero(&pfx_ro, sizeof(pfx_ro));
pfx_addr = (struct sockaddr_in *)(&pfx_ro.ro_dst);
pfx_addr->sin_len = sizeof(*pfx_addr);
pfx_addr->sin_family = AF_INET;
pfx_addr->sin_addr = *prefix;
rtalloc_ign_fib(&pfx_ro, 0, 0);
if (pfx_ro.ro_rt != NULL) {
msg_rt = *pfx_ro.ro_rt;
/* QL: XXX
* Point the gateway to the new interface
* address as if a new prefix route entry has
* been added through the new address alias.
* All other parts of the rtentry is accurate,
* e.g., rt_key, rt_mask, rt_ifp etc.
*/
msg_rt.rt_gateway =
(struct sockaddr *)&target->ia_addr;
rt_newaddrmsg(cmd,
(struct ifaddr *)target,
0, &msg_rt);
RTFREE(pfx_ro.ro_rt);
}
return;
}
/*
* Check if we have a route for the given prefix already or add one accordingly.
*/
static int
in_addprefix(struct in_ifaddr *target, int flags)
{
struct in_ifaddr *ia;
struct in_addr prefix, mask, p, m;
int error;
if ((flags & RTF_HOST) != 0) {
prefix = target->ia_dstaddr.sin_addr;
mask.s_addr = 0;
} else {
prefix = target->ia_addr.sin_addr;
mask = target->ia_sockmask.sin_addr;
prefix.s_addr &= mask.s_addr;
}
IN_IFADDR_RLOCK();
TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
if (rtinitflags(ia)) {
p = ia->ia_dstaddr.sin_addr;
if (prefix.s_addr != p.s_addr)
continue;
} else {
p = ia->ia_addr.sin_addr;
m = ia->ia_sockmask.sin_addr;
p.s_addr &= m.s_addr;
if (prefix.s_addr != p.s_addr ||
mask.s_addr != m.s_addr)
continue;
}
/*
* If we got a matching prefix route inserted by other
* interface address, we are done here.
*/
if (ia->ia_flags & IFA_ROUTE) {
#ifdef RADIX_MPATH
if (ia->ia_addr.sin_addr.s_addr ==
target->ia_addr.sin_addr.s_addr) {
IN_IFADDR_RUNLOCK();
return (EEXIST);
} else
break;
#endif
if (V_sameprefixcarponly &&
target->ia_ifp->if_type != IFT_CARP &&
ia->ia_ifp->if_type != IFT_CARP) {
IN_IFADDR_RUNLOCK();
return (EEXIST);
} else {
in_addralias_rtmsg(RTM_ADD, &prefix, target);
IN_IFADDR_RUNLOCK();
return (0);
}
}
}
IN_IFADDR_RUNLOCK();
/*
* No-one seem to have this prefix route, so we try to insert it.
*/
error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags);
if (!error)
target->ia_flags |= IFA_ROUTE;
return (error);
}
extern void arp_ifscrub(struct ifnet *ifp, uint32_t addr);
/*
* If there is no other address in the system that can serve a route to the
* same prefix, remove the route. Hand over the route to the new address
* otherwise.
*/
static int
in_scrubprefix(struct in_ifaddr *target, u_int flags)
{
struct in_ifaddr *ia;
struct in_addr prefix, mask, p;
int error = 0;
struct sockaddr_in prefix0, mask0;
/*
* Remove the loopback route to the interface address.
* The "useloopback" setting is not consulted because if the
* user configures an interface address, turns off this
* setting, and then tries to delete that interface address,
* checking the current setting of "useloopback" would leave
* that interface address loopback route untouched, which
* would be wrong. Therefore the interface address loopback route
* deletion is unconditional.
*/
if ((target->ia_addr.sin_addr.s_addr != INADDR_ANY) &&
!(target->ia_ifp->if_flags & IFF_LOOPBACK) &&
(target->ia_flags & IFA_RTSELF)) {
struct route ia_ro;
int freeit = 0;
bzero(&ia_ro, sizeof(ia_ro));
*((struct sockaddr_in *)(&ia_ro.ro_dst)) = target->ia_addr;
rtalloc_ign_fib(&ia_ro, 0, 0);
if ((ia_ro.ro_rt != NULL) && (ia_ro.ro_rt->rt_ifp != NULL) &&
(ia_ro.ro_rt->rt_ifp == V_loif)) {
RT_LOCK(ia_ro.ro_rt);
if (ia_ro.ro_rt->rt_refcnt <= 1)
freeit = 1;
else if (flags & LLE_STATIC) {
RT_REMREF(ia_ro.ro_rt);
target->ia_flags &= ~IFA_RTSELF;
}
RTFREE_LOCKED(ia_ro.ro_rt);
}
if (freeit && (flags & LLE_STATIC)) {
error = ifa_del_loopback_route((struct ifaddr *)target,
(struct sockaddr *)&target->ia_addr);
if (error == 0)
target->ia_flags &= ~IFA_RTSELF;
}
if ((flags & LLE_STATIC) &&
!(target->ia_ifp->if_flags & IFF_NOARP))
/* remove arp cache */
arp_ifscrub(target->ia_ifp, IA_SIN(target)->sin_addr.s_addr);
}
if (rtinitflags(target))
prefix = target->ia_dstaddr.sin_addr;
else {
prefix = target->ia_addr.sin_addr;
mask = target->ia_sockmask.sin_addr;
prefix.s_addr &= mask.s_addr;
}
if ((target->ia_flags & IFA_ROUTE) == 0) {
in_addralias_rtmsg(RTM_DELETE, &prefix, target);
return (0);
}
IN_IFADDR_RLOCK();
TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
if (rtinitflags(ia))
p = ia->ia_dstaddr.sin_addr;
else {
p = ia->ia_addr.sin_addr;
p.s_addr &= ia->ia_sockmask.sin_addr.s_addr;
}
if ((prefix.s_addr != p.s_addr) ||
!(ia->ia_ifp->if_flags & IFF_UP))
continue;
/*
* If we got a matching prefix address, move IFA_ROUTE and
* the route itself to it. Make sure that routing daemons
* get a heads-up.
*
* XXX: a special case for carp(4) interface - this should
* be more generally specified as an interface that
* doesn't support such action.
*/
if ((ia->ia_flags & IFA_ROUTE) == 0
&& (ia->ia_ifp->if_type != IFT_CARP)) {
ifa_ref(&ia->ia_ifa);
IN_IFADDR_RUNLOCK();
error = rtinit(&(target->ia_ifa), (int)RTM_DELETE,
rtinitflags(target));
if (error == 0)
target->ia_flags &= ~IFA_ROUTE;
else
log(LOG_INFO, "in_scrubprefix: err=%d, old prefix delete failed\n",
error);
error = rtinit(&ia->ia_ifa, (int)RTM_ADD,
rtinitflags(ia) | RTF_UP);
if (error == 0)
ia->ia_flags |= IFA_ROUTE;
else
log(LOG_INFO, "in_scrubprefix: err=%d, new prefix add failed\n",
error);
ifa_free(&ia->ia_ifa);
return (error);
}
}
IN_IFADDR_RUNLOCK();
/*
* remove all L2 entries on the given prefix
*/
bzero(&prefix0, sizeof(prefix0));
prefix0.sin_len = sizeof(prefix0);
prefix0.sin_family = AF_INET;
prefix0.sin_addr.s_addr = target->ia_subnet;
bzero(&mask0, sizeof(mask0));
mask0.sin_len = sizeof(mask0);
mask0.sin_family = AF_INET;
mask0.sin_addr.s_addr = target->ia_subnetmask;
lltable_prefix_free(AF_INET, (struct sockaddr *)&prefix0,
(struct sockaddr *)&mask0, flags);
/*
* As no-one seem to have this prefix, we can remove the route.
*/
error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target));
if (error == 0)
target->ia_flags &= ~IFA_ROUTE;
else
log(LOG_INFO, "in_scrubprefix: err=%d, prefix delete failed\n", error);
return (error);
}
#undef rtinitflags
/*
* Return 1 if the address might be a local broadcast address.
*/
int
in_broadcast(struct in_addr in, struct ifnet *ifp)
{
register struct ifaddr *ifa;
u_long t;
if (in.s_addr == INADDR_BROADCAST ||
in.s_addr == INADDR_ANY)
return (1);
if ((ifp->if_flags & IFF_BROADCAST) == 0)
return (0);
t = ntohl(in.s_addr);
/*
* Look through the list of addresses for a match
* with a broadcast address.
*/
#define ia ((struct in_ifaddr *)ifa)
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
if (ifa->ifa_addr->sa_family == AF_INET &&
(in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
/*
* Check for old-style (host 0) broadcast, but
* taking into account that RFC 3021 obsoletes it.
*/
(ia->ia_subnetmask != IN_RFC3021_MASK &&
t == ia->ia_subnet)) &&
/*
* Check for an all one subnetmask. These
* only exist when an interface gets a secondary
* address.
*/
ia->ia_subnetmask != (u_long)0xffffffff)
return (1);
return (0);
#undef ia
}
/*
* On interface removal, clean up IPv4 data structures hung off of the ifnet.
*/
void
in_ifdetach(struct ifnet *ifp)
{
in_pcbpurgeif0(&V_ripcbinfo, ifp);
in_pcbpurgeif0(&V_udbinfo, ifp);
in_purgemaddrs(ifp);
}
/*
* Delete all IPv4 multicast address records, and associated link-layer
* multicast address records, associated with ifp.
* XXX It looks like domifdetach runs AFTER the link layer cleanup.
* XXX This should not race with ifma_protospec being set during
* a new allocation, if it does, we have bigger problems.
*/
static void
in_purgemaddrs(struct ifnet *ifp)
{
LIST_HEAD(,in_multi) purgeinms;
struct in_multi *inm, *tinm;
struct ifmultiaddr *ifma;
LIST_INIT(&purgeinms);
IN_MULTI_LOCK();
/*
* Extract list of in_multi associated with the detaching ifp
* which the PF_INET layer is about to release.
* We need to do this as IF_ADDR_LOCK() may be re-acquired
* by code further down.
*/
IF_ADDR_LOCK(ifp);
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
if (ifma->ifma_addr->sa_family != AF_INET ||
ifma->ifma_protospec == NULL)
continue;
#if 0
KASSERT(ifma->ifma_protospec != NULL,
("%s: ifma_protospec is NULL", __func__));
#endif
inm = (struct in_multi *)ifma->ifma_protospec;
LIST_INSERT_HEAD(&purgeinms, inm, inm_link);
}
IF_ADDR_UNLOCK(ifp);
LIST_FOREACH_SAFE(inm, &purgeinms, inm_link, tinm) {
LIST_REMOVE(inm, inm_link);
inm_release_locked(inm);
}
igmp_ifdetach(ifp);
IN_MULTI_UNLOCK();
}
#include <net/if_dl.h>
#include <netinet/if_ether.h>
struct in_llentry {
struct llentry base;
struct sockaddr_in l3_addr4;
};
static struct llentry *
in_lltable_new(const struct sockaddr *l3addr, u_int flags)
{
struct in_llentry *lle;
lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_DONTWAIT | M_ZERO);
if (lle == NULL) /* NB: caller generates msg */
return NULL;
callout_init(&lle->base.la_timer, CALLOUT_MPSAFE);
/*
* For IPv4 this will trigger "arpresolve" to generate
* an ARP request.
*/
lle->base.la_expire = time_uptime; /* mark expired */
lle->l3_addr4 = *(const struct sockaddr_in *)l3addr;
lle->base.lle_refcnt = 1;
LLE_LOCK_INIT(&lle->base);
return &lle->base;
}
/*
* Deletes an address from the address table.
* This function is called by the timer functions
* such as arptimer() and nd6_llinfo_timer(), and
* the caller does the locking.
*/
static void
in_lltable_free(struct lltable *llt, struct llentry *lle)
{
LLE_WUNLOCK(lle);
LLE_LOCK_DESTROY(lle);
free(lle, M_LLTABLE);
}
#define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \
(((ntohl((d)->sin_addr.s_addr) ^ (a)->sin_addr.s_addr) & (m)->sin_addr.s_addr)) == 0 )
static void
in_lltable_prefix_free(struct lltable *llt,
const struct sockaddr *prefix,
const struct sockaddr *mask,
u_int flags)
{
const struct sockaddr_in *pfx = (const struct sockaddr_in *)prefix;
const struct sockaddr_in *msk = (const struct sockaddr_in *)mask;
struct llentry *lle, *next;
register int i;
size_t pkts_dropped;
for (i=0; i < LLTBL_HASHTBL_SIZE; i++) {
LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) {
/*
* (flags & LLE_STATIC) means deleting all entries
* including static ARP entries
*/
if (IN_ARE_MASKED_ADDR_EQUAL((struct sockaddr_in *)L3_ADDR(lle),
pfx, msk) &&
((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))) {
int canceled;
canceled = callout_drain(&lle->la_timer);
LLE_WLOCK(lle);
if (canceled)
LLE_REMREF(lle);
pkts_dropped = llentry_free(lle);
ARPSTAT_ADD(dropped, pkts_dropped);
}
}
}
}
static int
in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr)
{
struct rtentry *rt;
KASSERT(l3addr->sa_family == AF_INET,
("sin_family %d", l3addr->sa_family));
/* XXX rtalloc1 should take a const param */
rt = rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0);
if (rt == NULL)
return (EINVAL);
/*
* If the gateway for an existing host route matches the target L3
* address, which is a special route inserted by some implementation
* such as MANET, and the interface is of the correct type, then
* allow for ARP to proceed.
*/
if (rt->rt_flags & RTF_GATEWAY) {
if (!(rt->rt_flags & RTF_HOST) || !rt->rt_ifp ||
rt->rt_ifp->if_type != IFT_ETHER ||
(rt->rt_ifp->if_flags &
(IFF_NOARP | IFF_STATICARP)) != 0 ||
memcmp(rt->rt_gateway->sa_data, l3addr->sa_data,
sizeof(in_addr_t)) != 0) {
RTFREE_LOCKED(rt);
return (EINVAL);
}
}
/*
* Make sure that at least the destination address is covered
* by the route. This is for handling the case where 2 or more
* interfaces have the same prefix. An incoming packet arrives
* on one interface and the corresponding outgoing packet leaves
* another interface.
*/
if (!(rt->rt_flags & RTF_HOST) && rt->rt_ifp != ifp) {
const char *sa, *mask, *addr, *lim;
int len;
mask = (const char *)rt_mask(rt);
/*
* Just being extra cautious to avoid some custom
* code getting into trouble.
*/
if (mask == NULL) {
RTFREE_LOCKED(rt);
return (EINVAL);
}
sa = (const char *)rt_key(rt);
addr = (const char *)l3addr;
len = ((const struct sockaddr_in *)l3addr)->sin_len;
lim = addr + len;
for ( ; addr < lim; sa++, mask++, addr++) {
if ((*sa ^ *addr) & *mask) {
#ifdef DIAGNOSTIC
log(LOG_INFO, "IPv4 address: \"%s\" is not on the network\n",
inet_ntoa(((const struct sockaddr_in *)l3addr)->sin_addr));
#endif
RTFREE_LOCKED(rt);
return (EINVAL);
}
}
}
RTFREE_LOCKED(rt);
return (0);
}
/*
* Return NULL if not found or marked for deletion.
* If found return lle read locked.
*/
static struct llentry *
in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
{
const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
struct ifnet *ifp = llt->llt_ifp;
struct llentry *lle;
struct llentries *lleh;
u_int hashkey;
IF_AFDATA_LOCK_ASSERT(ifp);
KASSERT(l3addr->sa_family == AF_INET,
("sin_family %d", l3addr->sa_family));
hashkey = sin->sin_addr.s_addr;
lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)];
LIST_FOREACH(lle, lleh, lle_next) {
struct sockaddr_in *sa2 = (struct sockaddr_in *)L3_ADDR(lle);
if (lle->la_flags & LLE_DELETED)
continue;
if (sa2->sin_addr.s_addr == sin->sin_addr.s_addr)
break;
}
if (lle == NULL) {
#ifdef DIAGNOSTIC
if (flags & LLE_DELETE)
log(LOG_INFO, "interface address is missing from cache = %p in delete\n", lle);
#endif
if (!(flags & LLE_CREATE))
return (NULL);
/*
* A route that covers the given address must have
* been installed 1st because we are doing a resolution,
* verify this.
*/
if (!(flags & LLE_IFADDR) &&
in_lltable_rtcheck(ifp, flags, l3addr) != 0)
goto done;
lle = in_lltable_new(l3addr, flags);
if (lle == NULL) {
log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
goto done;
}
lle->la_flags = flags & ~LLE_CREATE;
if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) {
bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen);
lle->la_flags |= (LLE_VALID | LLE_STATIC);
}
lle->lle_tbl = llt;
lle->lle_head = lleh;
LIST_INSERT_HEAD(lleh, lle, lle_next);
} else if (flags & LLE_DELETE) {
if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) {
LLE_WLOCK(lle);
lle->la_flags = LLE_DELETED;
EVENTHANDLER_INVOKE(arp_update_event, lle);
LLE_WUNLOCK(lle);
#ifdef DIAGNOSTIC
log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
#endif
}
lle = (void *)-1;
}
if (LLE_IS_VALID(lle)) {
if (flags & LLE_EXCLUSIVE)
LLE_WLOCK(lle);
else
LLE_RLOCK(lle);
}
done:
return (lle);
}
static int
in_lltable_dump(struct lltable *llt, struct sysctl_req *wr)
{
#define SIN(lle) ((struct sockaddr_in *) L3_ADDR(lle))
struct ifnet *ifp = llt->llt_ifp;
struct llentry *lle;
/* XXX stack use */
struct {
struct rt_msghdr rtm;
struct sockaddr_inarp sin;
struct sockaddr_dl sdl;
} arpc;
int error, i;
LLTABLE_LOCK_ASSERT();
error = 0;
for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
LIST_FOREACH(lle, &llt->lle_head[i], lle_next) {
struct sockaddr_dl *sdl;
/* skip deleted entries */
if ((lle->la_flags & LLE_DELETED) == LLE_DELETED)
continue;
/* Skip if jailed and not a valid IP of the prison. */
if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0)
continue;
/*
* produce a msg made of:
* struct rt_msghdr;
* struct sockaddr_inarp; (IPv4)
* struct sockaddr_dl;
*/
bzero(&arpc, sizeof(arpc));
arpc.rtm.rtm_msglen = sizeof(arpc);
arpc.rtm.rtm_version = RTM_VERSION;
arpc.rtm.rtm_type = RTM_GET;
arpc.rtm.rtm_flags = RTF_UP;
arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
arpc.sin.sin_family = AF_INET;
arpc.sin.sin_len = sizeof(arpc.sin);
arpc.sin.sin_addr.s_addr = SIN(lle)->sin_addr.s_addr;
/* publish */
if (lle->la_flags & LLE_PUB) {
arpc.rtm.rtm_flags |= RTF_ANNOUNCE;
/* proxy only */
if (lle->la_flags & LLE_PROXY)
arpc.sin.sin_other = SIN_PROXY;
}
sdl = &arpc.sdl;
sdl->sdl_family = AF_LINK;
sdl->sdl_len = sizeof(*sdl);
sdl->sdl_index = ifp->if_index;
sdl->sdl_type = ifp->if_type;
if ((lle->la_flags & LLE_VALID) == LLE_VALID) {
sdl->sdl_alen = ifp->if_addrlen;
bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
} else {
sdl->sdl_alen = 0;
bzero(LLADDR(sdl), ifp->if_addrlen);
}
arpc.rtm.rtm_rmx.rmx_expire =
lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
if (lle->la_flags & LLE_STATIC)
arpc.rtm.rtm_flags |= RTF_STATIC;
arpc.rtm.rtm_index = ifp->if_index;
error = SYSCTL_OUT(wr, &arpc, sizeof(arpc));
if (error)
break;
}
}
return error;
#undef SIN
}
void *
in_domifattach(struct ifnet *ifp)
{
struct in_ifinfo *ii;
struct lltable *llt;
ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO);
llt = lltable_init(ifp, AF_INET);
if (llt != NULL) {
llt->llt_free = in_lltable_free;
llt->llt_prefix_free = in_lltable_prefix_free;
llt->llt_lookup = in_lltable_lookup;
llt->llt_dump = in_lltable_dump;
}
ii->ii_llt = llt;
ii->ii_igmp = igmp_domifattach(ifp);
return ii;
}
void
in_domifdetach(struct ifnet *ifp, void *aux)
{
struct in_ifinfo *ii = (struct in_ifinfo *)aux;
igmp_domifdetach(ifp);
lltable_free(ii->ii_llt);
free(ii, M_IFADDR);
}
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