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/* $OpenBSD: in.c,v 1.186 2024/01/06 10:58:45 bluhm Exp $ */
/* $NetBSD: in.c,v 1.26 1996/02/13 23:41:39 christos Exp $ */
/*
* 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.
* 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.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)in.c 8.2 (Berkeley) 11/15/93
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/ioctl.h>
#include <sys/malloc.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/igmp_var.h>
#ifdef MROUTING
#include <netinet/ip_mroute.h>
#endif
#include "ether.h"
void in_socktrim(struct sockaddr_in *);
int in_ioctl_set_ifaddr(u_long, caddr_t, struct ifnet *);
int in_ioctl_change_ifaddr(u_long, caddr_t, struct ifnet *);
int in_ioctl_get(u_long, caddr_t, struct ifnet *);
void in_purgeaddr(struct ifaddr *);
int in_addhost(struct in_ifaddr *, struct sockaddr_in *);
int in_scrubhost(struct in_ifaddr *, struct sockaddr_in *);
int in_insert_prefix(struct in_ifaddr *);
void in_remove_prefix(struct in_ifaddr *);
/*
* 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)
{
u_int32_t net;
if (IN_MULTICAST(in.s_addr))
return (0);
if (IN_CLASSA(in.s_addr)) {
net = in.s_addr & IN_CLASSA_NET;
if (net == 0 ||
net == htonl(IN_LOOPBACKNET << IN_CLASSA_NSHIFT))
return (0);
}
return (1);
}
/*
* Trim a mask in a sockaddr
*/
void
in_socktrim(struct sockaddr_in *ap)
{
char *cplim = (char *) &ap->sin_addr;
char *cp = (char *) (&ap->sin_addr + 1);
ap->sin_len = 0;
while (--cp >= cplim)
if (*cp) {
(ap)->sin_len = cp - (char *) (ap) + 1;
break;
}
}
int
in_mask2len(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;
}
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;
}
int
in_nam2sin(const struct mbuf *nam, struct sockaddr_in **sin)
{
struct sockaddr *sa = mtod(nam, struct sockaddr *);
if (nam->m_len < offsetof(struct sockaddr, sa_data))
return EINVAL;
if (sa->sa_family != AF_INET)
return EAFNOSUPPORT;
if (sa->sa_len != nam->m_len)
return EINVAL;
if (sa->sa_len != sizeof(struct sockaddr_in))
return EINVAL;
*sin = satosin(sa);
return 0;
}
int
in_sa2sin(struct sockaddr *sa, struct sockaddr_in **sin)
{
if (sa->sa_family != AF_INET)
return EAFNOSUPPORT;
if (sa->sa_len != sizeof(struct sockaddr_in))
return EINVAL;
*sin = satosin(sa);
return 0;
}
int
in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp)
{
int privileged;
privileged = 0;
if ((so->so_state & SS_PRIV) != 0)
privileged++;
switch (cmd) {
#ifdef MROUTING
case SIOCGETVIFCNT:
case SIOCGETSGCNT:
return mrt_ioctl(so, cmd, data);
#endif /* MROUTING */
default:
return in_ioctl(cmd, data, ifp, privileged);
}
}
int
in_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, int privileged)
{
struct ifreq *ifr = (struct ifreq *)data;
struct ifaddr *ifa;
struct in_ifaddr *ia = NULL;
struct sockaddr_in *sin = NULL, oldaddr;
int error = 0;
if (ifp == NULL)
return (ENXIO);
switch (cmd) {
case SIOCGIFADDR:
case SIOCGIFNETMASK:
case SIOCGIFDSTADDR:
case SIOCGIFBRDADDR:
return in_ioctl_get(cmd, data, ifp);
case SIOCSIFADDR:
if (!privileged)
return (EPERM);
return in_ioctl_set_ifaddr(cmd, data, ifp);
case SIOCAIFADDR:
case SIOCDIFADDR:
if (!privileged)
return (EPERM);
return in_ioctl_change_ifaddr(cmd, data, ifp);
case SIOCSIFNETMASK:
case SIOCSIFDSTADDR:
case SIOCSIFBRDADDR:
break;
default:
return (EOPNOTSUPP);
}
if (!privileged)
return (EPERM);
if (ifr->ifr_addr.sa_family == AF_INET) {
error = in_sa2sin(&ifr->ifr_addr, &sin);
if (error)
return (error);
}
NET_LOCK();
KERNEL_LOCK();
TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
if (ifa->ifa_addr->sa_family != AF_INET)
continue;
/* find first address or exact match */
if (ia == NULL)
ia = ifatoia(ifa);
if (sin == NULL || sin->sin_addr.s_addr == INADDR_ANY)
break;
if (ifatoia(ifa)->ia_addr.sin_addr.s_addr ==
sin->sin_addr.s_addr) {
ia = ifatoia(ifa);
break;
}
}
if (ia == NULL) {
error = EADDRNOTAVAIL;
goto err;
}
switch (cmd) {
case SIOCSIFDSTADDR:
if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
error = EINVAL;
break;
}
error = in_sa2sin(&ifr->ifr_dstaddr, &sin);
if (error)
break;
oldaddr = ia->ia_dstaddr;
ia->ia_dstaddr = *sin;
error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR, (caddr_t)ia);
if (error) {
ia->ia_dstaddr = oldaddr;
break;
}
in_scrubhost(ia, &oldaddr);
in_addhost(ia, &ia->ia_dstaddr);
break;
case SIOCSIFBRDADDR:
if ((ifp->if_flags & IFF_BROADCAST) == 0) {
error = EINVAL;
break;
}
error = in_sa2sin(&ifr->ifr_broadaddr, &sin);
if (error)
break;
ifa_update_broadaddr(ifp, &ia->ia_ifa, sintosa(sin));
break;
case SIOCSIFNETMASK:
if (ifr->ifr_addr.sa_len < 8) {
error = EINVAL;
break;
}
/* do not check inet family or strict len */
sin = satosin(&ifr->ifr_addr);
if (ntohl(sin->sin_addr.s_addr) &
(~ntohl(sin->sin_addr.s_addr) >> 1)) {
/* non-contiguous netmask */
error = EINVAL;
break;
}
ia->ia_netmask = ia->ia_sockmask.sin_addr.s_addr =
sin->sin_addr.s_addr;
break;
}
err:
KERNEL_UNLOCK();
NET_UNLOCK();
return (error);
}
int
in_ioctl_set_ifaddr(u_long cmd, caddr_t data, struct ifnet *ifp)
{
struct ifreq *ifr = (struct ifreq *)data;
struct ifaddr *ifa;
struct in_ifaddr *ia = NULL;
struct sockaddr_in *sin;
int error = 0;
int newifaddr;
if (cmd != SIOCSIFADDR)
panic("%s: invalid ioctl %lu", __func__, cmd);
error = in_sa2sin(&ifr->ifr_addr, &sin);
if (error)
return (error);
NET_LOCK();
KERNEL_LOCK();
TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
if (ifa->ifa_addr->sa_family != AF_INET)
continue;
/* find first address */
ia = ifatoia(ifa);
break;
}
if (ia == NULL) {
ia = malloc(sizeof *ia, M_IFADDR, M_WAITOK | M_ZERO);
refcnt_init_trace(&ia->ia_ifa.ifa_refcnt, DT_REFCNT_IDX_IFADDR);
ia->ia_addr.sin_family = AF_INET;
ia->ia_addr.sin_len = sizeof(ia->ia_addr);
ia->ia_ifa.ifa_addr = sintosa(&ia->ia_addr);
ia->ia_ifa.ifa_dstaddr = sintosa(&ia->ia_dstaddr);
ia->ia_ifa.ifa_netmask = sintosa(&ia->ia_sockmask);
ia->ia_sockmask.sin_len = 8;
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;
newifaddr = 1;
} else
newifaddr = 0;
in_ifscrub(ifp, ia);
error = in_ifinit(ifp, ia, sin, newifaddr);
if (!error)
if_addrhooks_run(ifp);
KERNEL_UNLOCK();
NET_UNLOCK();
return error;
}
int
in_ioctl_change_ifaddr(u_long cmd, caddr_t data, struct ifnet *ifp)
{
struct ifaddr *ifa;
struct in_ifaddr *ia = NULL;
struct in_aliasreq *ifra = (struct in_aliasreq *)data;
struct sockaddr_in *sin = NULL, *dstsin = NULL, *broadsin = NULL;
struct sockaddr_in *masksin = NULL;
int error = 0;
int newifaddr;
if (ifra->ifra_addr.sin_family == AF_INET) {
error = in_sa2sin(sintosa(&ifra->ifra_addr), &sin);
if (error)
return (error);
}
NET_LOCK();
KERNEL_LOCK();
TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
if (ifa->ifa_addr->sa_family != AF_INET)
continue;
/* find first address, if no exact match wanted */
if (sin == NULL || sin->sin_addr.s_addr ==
ifatoia(ifa)->ia_addr.sin_addr.s_addr) {
ia = ifatoia(ifa);
break;
}
}
switch (cmd) {
case SIOCAIFADDR: {
int needinit = 0;
if (ifra->ifra_mask.sin_len) {
if (ifra->ifra_mask.sin_len < 8) {
error = EINVAL;
break;
}
/* do not check inet family or strict len */
masksin = &ifra->ifra_mask;
if (ntohl(masksin->sin_addr.s_addr) &
(~ntohl(masksin->sin_addr.s_addr) >> 1)) {
/* non-contiguous netmask */
error = EINVAL;
break;
}
}
if ((ifp->if_flags & IFF_POINTOPOINT) &&
ifra->ifra_dstaddr.sin_family == AF_INET) {
error = in_sa2sin(sintosa(&ifra->ifra_dstaddr),
&dstsin);
if (error)
break;
}
if ((ifp->if_flags & IFF_BROADCAST) &&
ifra->ifra_broadaddr.sin_family == AF_INET) {
error = in_sa2sin(sintosa(&ifra->ifra_broadaddr),
&broadsin);
if (error)
break;
}
if (ia == NULL) {
ia = malloc(sizeof *ia, M_IFADDR, M_WAITOK | M_ZERO);
refcnt_init_trace(&ia->ia_ifa.ifa_refcnt,
DT_REFCNT_IDX_IFADDR);
ia->ia_addr.sin_family = AF_INET;
ia->ia_addr.sin_len = sizeof(ia->ia_addr);
ia->ia_ifa.ifa_addr = sintosa(&ia->ia_addr);
ia->ia_ifa.ifa_dstaddr = sintosa(&ia->ia_dstaddr);
ia->ia_ifa.ifa_netmask = sintosa(&ia->ia_sockmask);
ia->ia_sockmask.sin_len = 8;
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;
newifaddr = 1;
} else
newifaddr = 0;
if (sin == NULL) {
sin = &ia->ia_addr;
} else if (newifaddr ||
sin->sin_addr.s_addr != ia->ia_addr.sin_addr.s_addr) {
needinit = 1;
}
if (masksin != NULL) {
in_ifscrub(ifp, ia);
ia->ia_netmask = ia->ia_sockmask.sin_addr.s_addr =
masksin->sin_addr.s_addr;
needinit = 1;
}
if (dstsin != NULL) {
in_ifscrub(ifp, ia);
ia->ia_dstaddr = *dstsin;
needinit = 1;
}
if (broadsin != NULL) {
if (newifaddr)
ia->ia_broadaddr = *broadsin;
else
ifa_update_broadaddr(ifp, &ia->ia_ifa,
sintosa(broadsin));
}
if (needinit) {
error = in_ifinit(ifp, ia, sin, newifaddr);
if (error)
break;
}
if_addrhooks_run(ifp);
break;
}
case SIOCDIFADDR:
if (ia == NULL) {
error = EADDRNOTAVAIL;
break;
}
/*
* Even if the individual steps were safe, shouldn't
* these kinds of changes happen atomically? What
* should happen to a packet that was routed after
* the scrub but before the other steps?
*/
in_purgeaddr(&ia->ia_ifa);
if_addrhooks_run(ifp);
break;
default:
panic("%s: invalid ioctl %lu", __func__, cmd);
}
KERNEL_UNLOCK();
NET_UNLOCK();
return (error);
}
int
in_ioctl_get(u_long cmd, caddr_t data, struct ifnet *ifp)
{
struct ifreq *ifr = (struct ifreq *)data;
struct ifaddr *ifa;
struct in_ifaddr *ia = NULL;
struct sockaddr *sa;
struct sockaddr_in *sin = NULL;
int error = 0;
sa = &ifr->ifr_addr;
if (sa->sa_family == AF_INET) {
sa->sa_len = sizeof(struct sockaddr_in);
error = in_sa2sin(sa, &sin);
if (error)
return (error);
}
NET_LOCK_SHARED();
TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
if (ifa->ifa_addr->sa_family != AF_INET)
continue;
/* find first address or exact match */
if (ia == NULL)
ia = ifatoia(ifa);
if (sin == NULL || sin->sin_addr.s_addr == INADDR_ANY)
break;
if (ifatoia(ifa)->ia_addr.sin_addr.s_addr ==
sin->sin_addr.s_addr) {
ia = ifatoia(ifa);
break;
}
}
if (ia == NULL) {
error = EADDRNOTAVAIL;
goto err;
}
switch(cmd) {
case SIOCGIFADDR:
*satosin(&ifr->ifr_addr) = ia->ia_addr;
break;
case SIOCGIFBRDADDR:
if ((ifp->if_flags & IFF_BROADCAST) == 0) {
error = EINVAL;
break;
}
*satosin(&ifr->ifr_dstaddr) = ia->ia_broadaddr;
break;
case SIOCGIFDSTADDR:
if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
error = EINVAL;
break;
}
*satosin(&ifr->ifr_dstaddr) = ia->ia_dstaddr;
break;
case SIOCGIFNETMASK:
*satosin(&ifr->ifr_addr) = ia->ia_sockmask;
break;
default:
panic("%s: invalid ioctl %lu", __func__, cmd);
}
err:
NET_UNLOCK_SHARED();
return (error);
}
/*
* Delete any existing route for an interface.
*/
void
in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia)
{
if (ISSET(ifp->if_flags, IFF_POINTOPOINT))
in_scrubhost(ia, &ia->ia_dstaddr);
else if (!ISSET(ifp->if_flags, IFF_LOOPBACK))
in_remove_prefix(ia);
}
/*
* Initialize an interface's internet address
* and routing table entry.
*/
int
in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, struct sockaddr_in *sin,
int newaddr)
{
u_int32_t i = sin->sin_addr.s_addr;
struct sockaddr_in oldaddr;
int error = 0, rterror;
NET_ASSERT_LOCKED();
/*
* Always remove the address from the tree to make sure its
* position gets updated in case the key changes.
*/
if (!newaddr) {
rt_ifa_dellocal(&ia->ia_ifa);
ifa_del(ifp, &ia->ia_ifa);
}
oldaddr = ia->ia_addr;
ia->ia_addr = *sin;
if (ia->ia_netmask == 0) {
if (IN_CLASSA(i))
ia->ia_netmask = IN_CLASSA_NET;
else if (IN_CLASSB(i))
ia->ia_netmask = IN_CLASSB_NET;
else
ia->ia_netmask = IN_CLASSC_NET;
ia->ia_sockmask.sin_addr.s_addr = ia->ia_netmask;
}
/*
* Give the interface a chance to initialize
* if this is its first address,
* and to validate the address if necessary.
*/
if ((error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia))) {
ia->ia_addr = oldaddr;
}
/*
* Add the address to the local list and the global tree. If an
* error occurred, put back the original address.
*/
ifa_add(ifp, &ia->ia_ifa);
rterror = rt_ifa_addlocal(&ia->ia_ifa);
if (rterror) {
if (!newaddr)
ifa_del(ifp, &ia->ia_ifa);
if (!error)
error = rterror;
goto out;
}
if (error)
goto out;
ia->ia_net = i & ia->ia_netmask;
in_socktrim(&ia->ia_sockmask);
/*
* Add route for the network.
*/
ia->ia_ifa.ifa_metric = ifp->if_metric;
if (ISSET(ifp->if_flags, IFF_BROADCAST)) {
if (IN_RFC3021_SUBNET(ia->ia_netmask))
ia->ia_broadaddr.sin_addr.s_addr = 0;
else {
ia->ia_broadaddr.sin_addr.s_addr =
ia->ia_net | ~ia->ia_netmask;
}
}
if (ISSET(ifp->if_flags, IFF_POINTOPOINT)) {
/* XXX We should not even call in_ifinit() in this case. */
if (ia->ia_dstaddr.sin_family != AF_INET)
goto out;
error = in_addhost(ia, &ia->ia_dstaddr);
} else if (!ISSET(ifp->if_flags, IFF_LOOPBACK)) {
error = in_insert_prefix(ia);
}
/*
* If the interface supports multicast, join the "all hosts"
* multicast group on that interface.
*/
if ((ifp->if_flags & IFF_MULTICAST) && ia->ia_allhosts == NULL) {
struct in_addr addr;
addr.s_addr = INADDR_ALLHOSTS_GROUP;
ia->ia_allhosts = in_addmulti(&addr, ifp);
}
out:
if (error && newaddr)
in_purgeaddr(&ia->ia_ifa);
return (error);
}
void
in_purgeaddr(struct ifaddr *ifa)
{
struct ifnet *ifp = ifa->ifa_ifp;
struct in_ifaddr *ia = ifatoia(ifa);
NET_ASSERT_LOCKED();
in_ifscrub(ifp, ia);
rt_ifa_dellocal(&ia->ia_ifa);
rt_ifa_purge(&ia->ia_ifa);
ifa_del(ifp, &ia->ia_ifa);
if (ia->ia_allhosts != NULL) {
in_delmulti(ia->ia_allhosts);
ia->ia_allhosts = NULL;
}
ia->ia_ifp = NULL;
ifafree(&ia->ia_ifa);
}
int
in_addhost(struct in_ifaddr *ia, struct sockaddr_in *dst)
{
return rt_ifa_add(&ia->ia_ifa, RTF_HOST | RTF_MPATH,
sintosa(dst), ia->ia_ifa.ifa_ifp->if_rdomain);
}
int
in_scrubhost(struct in_ifaddr *ia, struct sockaddr_in *dst)
{
return rt_ifa_del(&ia->ia_ifa, RTF_HOST,
sintosa(dst), ia->ia_ifa.ifa_ifp->if_rdomain);
}
/*
* Insert the cloning and broadcast routes for this subnet.
*/
int
in_insert_prefix(struct in_ifaddr *ia)
{
struct ifaddr *ifa = &ia->ia_ifa;
int error;
error = rt_ifa_add(ifa, RTF_CLONING | RTF_CONNECTED | RTF_MPATH,
ifa->ifa_addr, ifa->ifa_ifp->if_rdomain);
if (error)
return (error);
if (ia->ia_broadaddr.sin_addr.s_addr != 0) {
error = rt_ifa_add(ifa, RTF_HOST | RTF_BROADCAST | RTF_MPATH,
ifa->ifa_broadaddr, ifa->ifa_ifp->if_rdomain);
}
return (error);
}
void
in_remove_prefix(struct in_ifaddr *ia)
{
struct ifaddr *ifa = &ia->ia_ifa;
rt_ifa_del(ifa, RTF_CLONING | RTF_CONNECTED,
ifa->ifa_addr, ifa->ifa_ifp->if_rdomain);
if (ia->ia_broadaddr.sin_addr.s_addr != 0) {
rt_ifa_del(ifa, RTF_HOST | RTF_BROADCAST,
ifa->ifa_broadaddr, ifa->ifa_ifp->if_rdomain);
}
}
/*
* Return 1 if the address is a local broadcast address.
*/
int
in_broadcast(struct in_addr in, u_int rtableid)
{
struct ifnet *ifn;
struct ifaddr *ifa;
u_int rdomain;
rdomain = rtable_l2(rtableid);
#define ia (ifatoia(ifa))
TAILQ_FOREACH(ifn, &ifnetlist, if_list) {
if (ifn->if_rdomain != rdomain)
continue;
if ((ifn->if_flags & IFF_BROADCAST) == 0)
continue;
TAILQ_FOREACH(ifa, &ifn->if_addrlist, ifa_list)
if (ifa->ifa_addr->sa_family == AF_INET &&
in.s_addr != ia->ia_addr.sin_addr.s_addr &&
in.s_addr == ia->ia_broadaddr.sin_addr.s_addr)
return 1;
}
return (0);
#undef ia
}
/*
* Add an address to the list of IP multicast addresses for a given interface.
*/
struct in_multi *
in_addmulti(struct in_addr *ap, struct ifnet *ifp)
{
struct in_multi *inm;
struct ifreq ifr;
/*
* See if address already in list.
*/
IN_LOOKUP_MULTI(*ap, ifp, inm);
if (inm != NULL) {
/*
* Found it; just increment the reference count.
*/
refcnt_take(&inm->inm_refcnt);
} else {
/*
* New address; allocate a new multicast record
* and link it into the interface's multicast list.
*/
inm = malloc(sizeof(*inm), M_IPMADDR, M_WAITOK | M_ZERO);
inm->inm_sin.sin_len = sizeof(struct sockaddr_in);
inm->inm_sin.sin_family = AF_INET;
inm->inm_sin.sin_addr = *ap;
refcnt_init_trace(&inm->inm_refcnt, DT_REFCNT_IDX_IFMADDR);
inm->inm_ifidx = ifp->if_index;
inm->inm_ifma.ifma_addr = sintosa(&inm->inm_sin);
/*
* Ask the network driver to update its multicast reception
* filter appropriately for the new address.
*/
memset(&ifr, 0, sizeof(ifr));
memcpy(&ifr.ifr_addr, &inm->inm_sin, sizeof(inm->inm_sin));
KERNEL_LOCK();
if ((*ifp->if_ioctl)(ifp, SIOCADDMULTI,(caddr_t)&ifr) != 0) {
KERNEL_UNLOCK();
free(inm, M_IPMADDR, sizeof(*inm));
return (NULL);
}
KERNEL_UNLOCK();
TAILQ_INSERT_HEAD(&ifp->if_maddrlist, &inm->inm_ifma,
ifma_list);
/*
* Let IGMP know that we have joined a new IP multicast group.
*/
igmp_joingroup(inm, ifp);
}
return (inm);
}
/*
* Delete a multicast address record.
*/
void
in_delmulti(struct in_multi *inm)
{
struct ifreq ifr;
struct ifnet *ifp;
NET_ASSERT_LOCKED();
if (refcnt_rele(&inm->inm_refcnt) == 0)
return;
ifp = if_get(inm->inm_ifidx);
if (ifp != NULL) {
/*
* No remaining claims to this record; let IGMP know that
* we are leaving the multicast group.
*/
igmp_leavegroup(inm, ifp);
/*
* Notify the network driver to update its multicast
* reception filter.
*/
memset(&ifr, 0, sizeof(ifr));
satosin(&ifr.ifr_addr)->sin_len = sizeof(struct sockaddr_in);
satosin(&ifr.ifr_addr)->sin_family = AF_INET;
satosin(&ifr.ifr_addr)->sin_addr = inm->inm_addr;
KERNEL_LOCK();
(*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)&ifr);
KERNEL_UNLOCK();
TAILQ_REMOVE(&ifp->if_maddrlist, &inm->inm_ifma, ifma_list);
}
if_put(ifp);
free(inm, M_IPMADDR, sizeof(*inm));
}
/*
* Return 1 if the multicast group represented by ``ap'' has been
* joined by interface ``ifp'', 0 otherwise.
*/
int
in_hasmulti(struct in_addr *ap, struct ifnet *ifp)
{
struct in_multi *inm;
int joined;
IN_LOOKUP_MULTI(*ap, ifp, inm);
joined = (inm != NULL);
return (joined);
}
void
in_ifdetach(struct ifnet *ifp)
{
struct ifaddr *ifa, *next;
/* nuke any of IPv4 addresses we have */
TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrlist, ifa_list, next) {
if (ifa->ifa_addr->sa_family != AF_INET)
continue;
in_purgeaddr(ifa);
if_addrhooks_run(ifp);
}
if (ifp->if_xflags & IFXF_AUTOCONF4)
ifp->if_xflags &= ~IFXF_AUTOCONF4;
}
void
in_prefixlen2mask(struct in_addr *maskp, int plen)
{
if (plen == 0)
maskp->s_addr = 0;
else
maskp->s_addr = htonl(0xffffffff << (32 - plen));
}
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