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NetBSD/usr.sbin/pim6dd/kern.c

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/* $NetBSD: kern.c,v 1.3 2000/12/04 07:05:48 itojun Exp $ */
/* $KAME: kern.c,v 1.2 2000/12/04 06:33:10 itojun Exp $ */
/*
* Copyright (c) 1998 by the University of Southern California.
* All rights reserved.
*
* Permission to use, copy, modify, and distribute this software and
* its documentation in source and binary forms for lawful
* purposes and without fee is hereby granted, provided
* that the above copyright notice appear in all copies and that both
* the copyright notice and this permission notice appear in supporting
* documentation, and that any documentation, advertising materials,
* and other materials related to such distribution and use acknowledge
* that the software was developed by the University of Southern
* California and/or Information Sciences Institute.
* The name of the University of Southern California may not
* be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THE UNIVERSITY OF SOUTHERN CALIFORNIA DOES NOT MAKE ANY REPRESENTATIONS
* ABOUT THE SUITABILITY OF THIS SOFTWARE FOR ANY PURPOSE. THIS SOFTWARE IS
* PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND
* NON-INFRINGEMENT.
*
* IN NO EVENT SHALL USC, OR ANY OTHER CONTRIBUTOR BE LIABLE FOR ANY
* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES, WHETHER IN CONTRACT,
* TORT, OR OTHER FORM OF ACTION, ARISING OUT OF OR IN CONNECTION WITH,
* THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Other copyrights might apply to parts of this software and are so
* noted when applicable.
*/
/*
* Questions concerning this software should be directed to
* Pavlin Ivanov Radoslavov (pavlin@catarina.usc.edu)
*/
/*
* Part of this program has been derived from mrouted.
* The mrouted program is covered by the license in the accompanying file
* named "LICENSE.mrouted".
*
* The mrouted program is COPYRIGHT 1989 by The Board of Trustees of
* Leland Stanford Junior University.
*
*/
#include "defs.h"
#ifdef RAW_OUTPUT_IS_RAW
int curttl = 0;
#endif
/*
* Open/init the multicast routing in the kernel and sets the MRT_ASSERT
* flag in the kernel.
*
*/
void
k_init_pim(socket)
int socket;
{
int v = 1;
if (setsockopt(socket, IPPROTO_IPV6,
MRT6_INIT, (char *)&v, sizeof(int)) < 0)
log(LOG_ERR, errno, "cannot enable multicast routing in kernel");
if(setsockopt(socket, IPPROTO_IPV6,
MRT6_PIM, (char *)&v, sizeof(int)) < 0)
log(LOG_ERR, errno, "cannot set ASSERT flag in kernel");
}
/*
* Stops the multicast routing in the kernel and resets the MRT_ASSERT
* flag in the kernel.
*/
void
k_stop_pim(socket)
int socket;
{
int v = 0;
if(setsockopt(socket, IPPROTO_IPV6, MRT6_PIM,
(char *)&v, sizeof(int)) < 0)
log(LOG_ERR, errno, "cannot reset ASSERT flag in kernel");
if (setsockopt(socket, IPPROTO_IPV6, MRT6_DONE, (char *)NULL, 0) < 0)
log(LOG_ERR, errno, "cannot disable multicast routing in kernel");
}
/*
* Set the socket receiving buffer. `bufsize` is the preferred size,
* `minsize` is the smallest acceptable size.
*/
void k_set_rcvbuf(socket, bufsize, minsize)
int socket;
int bufsize;
int minsize;
{
int delta = bufsize / 2;
int iter = 0;
/*
* Set the socket buffer. If we can't set it as large as we
* want, search around to try to find the highest acceptable
* value. The highest acceptable value being smaller than
* minsize is a fatal error.
*/
if (setsockopt(socket, SOL_SOCKET, SO_RCVBUF,
(char *)&bufsize, sizeof(bufsize)) < 0) {
bufsize -= delta;
while (1) {
iter++;
if (delta > 1)
delta /= 2;
if (setsockopt(socket, SOL_SOCKET, SO_RCVBUF,
(char *)&bufsize, sizeof(bufsize)) < 0) {
bufsize -= delta;
} else {
if (delta < 1024)
break;
bufsize += delta;
}
}
if (bufsize < minsize) {
log(LOG_ERR, 0, "OS-allowed buffer size %u < app min %u",
bufsize, minsize);
/*NOTREACHED*/
}
}
IF_DEBUG(DEBUG_KERN)
log(LOG_DEBUG, 0, "Got %d byte buffer size in %d iterations",
bufsize, iter);
}
#if 0 /* there is no HDRINCL option in IPv6 */
/*
* Set/reset the IP_HDRINCL option. My guess is we don't need it for raw
* sockets, but having it here won't hurt. Well, unless you are running
* an older version of FreeBSD (older than 2.2.2). If the multicast
* raw packet is bigger than 208 bytes, then IP_HDRINCL triggers a bug
* in the kernel and "panic". The kernel patch for netinet/ip_raw.c
* coming with this distribution fixes it.
*/
void k_hdr_include(socket, bool)
int socket;
int bool;
{
#ifdef IP_HDRINCL
if (setsockopt(socket, IPPROTO_IP, IP_HDRINCL,
(char *)&bool, sizeof(bool)) < 0)
log(LOG_ERR, errno, "setsockopt IP_HDRINCL %u", bool);
#endif
}
#endif /* 0 */
/*
* Set the default Hop Limit for the multicast packets outgoing from this
* socket.
*/
void k_set_hlim(socket, h)
int socket;
int h;
{
#ifdef RAW_OUTPUT_IS_RAW
curttl = h;
#else
int hlim = h;
if (setsockopt(socket, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
(char *)&hlim, sizeof(hlim)) < 0)
log(LOG_ERR, errno, "setsockopt IPV6_MULTICAST_HOPS %u", hlim);
#endif
}
/*
* Set/reset the IPV6_MULTICAST_LOOP. Set/reset is specified by "flag".
*/
void k_set_loop(socket, flag)
int socket;
int flag;
{
u_int loop;
loop = flag;
if (setsockopt(socket, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
(char *)&loop, sizeof(loop)) < 0)
log(LOG_ERR, errno, "setsockopt IPV6_MULTICAST_LOOP %u", loop);
}
/*
* Set the IPV6_MULTICAST_IF option on local interface which has the
* specified index.
*/
void k_set_if(socket, ifindex)
int socket;
u_int ifindex;
{
if (setsockopt(socket, IPPROTO_IPV6, IPV6_MULTICAST_IF,
(char *)&ifindex, sizeof(ifindex)) < 0)
log(LOG_ERR, errno, "setsockopt IPV6_MULTICAST_IF for %s",
ifindex2str(ifindex));
}
/*
* Join a multicast grp group on local interface ifa.
*/
void k_join(socket, grp, ifindex)
int socket;
struct in6_addr *grp;
u_int ifindex;
{
struct ipv6_mreq mreq;
mreq.ipv6mr_multiaddr = *grp;
mreq.ipv6mr_interface = ifindex;
if (setsockopt(socket, IPPROTO_IPV6, IPV6_JOIN_GROUP,
(char *)&mreq, sizeof(mreq)) < 0)
log(LOG_WARNING, errno, "cannot join group %s on interface %s",
inet6_fmt(grp), ifindex2str(ifindex));
}
/*
* Leave a multicats grp group on local interface ifa.
*/
void k_leave(socket, grp, ifindex)
int socket;
struct in6_addr *grp;
u_int ifindex;
{
struct ipv6_mreq mreq;
mreq.ipv6mr_multiaddr = *grp;
mreq.ipv6mr_interface = ifindex;
if (setsockopt(socket, IPPROTO_IPV6, IPV6_LEAVE_GROUP,
(char *)&mreq, sizeof(mreq)) < 0)
log(LOG_WARNING, errno, "cannot leave group %s on interface %s",
inet6_fmt(grp), ifindex2str(ifindex));
}
/*
* Add a virtual interface in the kernel.
*/
void k_add_vif(socket, vifi, v)
int socket;
vifi_t vifi;
struct uvif *v;
{
struct mif6ctl mc;
mc.mif6c_mifi = vifi;
/* TODO: only for DVMRP tunnels?
mc.mif6c_flags = v->uv_flags & VIFF_KERNEL_FLAGS;
*/
mc.mif6c_flags = v->uv_flags;
#ifdef notyet
mc.mif6c_rate_limit = v->uv_rate_limit;
#endif
mc.mif6c_pifi = v->uv_ifindex;
if (setsockopt(socket, IPPROTO_IPV6, MRT6_ADD_MIF,
(char *)&mc, sizeof(mc)) < 0)
log(LOG_ERR, errno, "setsockopt MRT6_ADD_MIF on mif %d", vifi);
}
/*
* Delete a virtual interface in the kernel.
*/
void k_del_vif(socket, vifi)
int socket;
vifi_t vifi;
{
if (setsockopt(socket, IPPROTO_IPV6, MRT6_DEL_MIF,
(char *)&vifi, sizeof(vifi)) < 0)
log(LOG_ERR, errno, "setsockopt MRT6_DEL_MIF on mif %d", vifi);
}
/*
* Delete all MFC entries for particular routing entry from the kernel.
*/
int
k_del_mfc(socket, source, group)
int socket;
struct sockaddr_in6 *source;
struct sockaddr_in6 *group;
{
struct mf6cctl mc;
mc.mf6cc_origin = *source;
mc.mf6cc_mcastgrp = *group;
if (setsockopt(socket, IPPROTO_IPV6, MRT6_DEL_MFC, (char *)&mc,
sizeof(mc)) < 0) {
log(LOG_WARNING, errno, "setsockopt MRT6_DEL_MFC");
return FALSE;
}
IF_DEBUG(DEBUG_MFC)
log(LOG_DEBUG, 0, "Deleted MFC entry: src %s, grp %s",
inet6_fmt(&source->sin6_addr),
inet6_fmt(&group->sin6_addr));
return(TRUE);
}
/*
* Install/modify a MFC entry in the kernel
*/
int
k_chg_mfc(socket, source, group, iif, oifs)
int socket;
struct sockaddr_in6 *source;
struct sockaddr_in6 *group;
vifi_t iif;
if_set *oifs;
{
struct mf6cctl mc;
vifi_t vifi;
mc.mf6cc_origin = *source;
mc.mf6cc_mcastgrp = *group;
mc.mf6cc_parent = iif;
IF_ZERO(&mc.mf6cc_ifset);
for (vifi = 0; vifi < numvifs; vifi++) {
if (IF_ISSET(vifi, oifs))
IF_SET(vifi, &mc.mf6cc_ifset);
else
IF_CLR(vifi, &mc.mf6cc_ifset);
}
if (setsockopt(socket, IPPROTO_IPV6, MRT6_ADD_MFC, (char *)&mc,
sizeof(mc)) < 0) {
log(LOG_WARNING, errno,
"setsockopt MRT6_ADD_MFC for source %s and group %s",
inet6_fmt(&source->sin6_addr), inet6_fmt(&group->sin6_addr));
return(FALSE);
}
return(TRUE);
}
/*
* Get packet counters for particular interface
*/
/*
* XXX: TODO: currently not used, but keep just in case we need it later.
*/
int k_get_vif_count(vifi, retval)
vifi_t vifi;
struct vif_count *retval;
{
struct sioc_mif_req6 mreq;
mreq.mifi = vifi;
if (ioctl(udp_socket, SIOCGETMIFCNT_IN6, (char *)&mreq) < 0) {
log(LOG_WARNING, errno, "SIOCGETMIFCNT_IN6 on vif %d", vifi);
retval->icount = retval->ocount = retval->ibytes =
retval->obytes = 0xffffffff;
return (1);
}
retval->icount = mreq.icount;
retval->ocount = mreq.ocount;
retval->ibytes = mreq.ibytes;
retval->obytes = mreq.obytes;
return (0);
}
/*
* Gets the number of packets, bytes, and number of packets arrived
* on wrong if in the kernel for particular (S,G) entry.
*/
int
k_get_sg_cnt(socket, source, group, retval)
int socket; /* udp_socket */
struct sockaddr_in6 *source;
struct sockaddr_in6 *group;
struct sg_count *retval;
{
struct sioc_sg_req6 sgreq;
sgreq.src = *source;
sgreq.grp = *group;
if (ioctl(socket, SIOCGETSGCNT_IN6, (char *)&sgreq) < 0) {
log(LOG_WARNING, errno, "SIOCGETSGCNT_IN6 on (%s %s)",
inet6_fmt(&source->sin6_addr), inet6_fmt(&group->sin6_addr));
retval->pktcnt = retval->bytecnt = retval->wrong_if = ~0; /* XXX */
return(1);
}
retval->pktcnt = sgreq.pktcnt;
retval->bytecnt = sgreq.bytecnt;
retval->wrong_if = sgreq.wrong_if;
return(0);
}
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