414 lines
10 KiB
C
414 lines
10 KiB
C
/*
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* Copyright (c) 1998 by the University of Southern California.
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* All rights reserved.
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*
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* Permission to use, copy, modify, and distribute this software and
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* its documentation in source and binary forms for lawful
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* purposes and without fee is hereby granted, provided
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* that the above copyright notice appear in all copies and that both
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* the copyright notice and this permission notice appear in supporting
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* documentation, and that any documentation, advertising materials,
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* and other materials related to such distribution and use acknowledge
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* that the software was developed by the University of Southern
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* California and/or Information Sciences Institute.
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* The name of the University of Southern California may not
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* be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THE UNIVERSITY OF SOUTHERN CALIFORNIA DOES NOT MAKE ANY REPRESENTATIONS
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* ABOUT THE SUITABILITY OF THIS SOFTWARE FOR ANY PURPOSE. THIS SOFTWARE IS
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* PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND
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* NON-INFRINGEMENT.
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*
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* IN NO EVENT SHALL USC, OR ANY OTHER CONTRIBUTOR BE LIABLE FOR ANY
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* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES, WHETHER IN CONTRACT,
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* TORT, OR OTHER FORM OF ACTION, ARISING OUT OF OR IN CONNECTION WITH,
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* THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Other copyrights might apply to parts of this software and are so
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* noted when applicable.
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*/
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/*
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* Questions concerning this software should be directed to
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* Mickael Hoerdt (hoerdt@clarinet.u-strasbg.fr) LSIIT Strasbourg.
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*
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*/
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/*
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* This program has been derived from pim6dd.
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* The pim6dd program is covered by the license in the accompanying file
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* named "LICENSE.pim6dd".
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*/
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/*
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* This program has been derived from pimd.
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* The pimd program is covered by the license in the accompanying file
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* named "LICENSE.pimd".
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*
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* $FreeBSD$
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*/
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#include <sys/time.h>
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <errno.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet6/ip6_mroute.h>
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#if defined(__FreeBSD__) && __FreeBSD__ >= 3
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#include <net/if_var.h>
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#endif
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#include <netinet6/in6_var.h>
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#include <syslog.h>
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#include "pimd.h"
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#include "inet6.h"
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#include "vif.h"
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#include "mrt.h"
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#include "debug.h"
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#include "kern.h"
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/*
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* Open/init the multicast routing in the kernel and sets the MRT_ASSERT
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* flag in the kernel.
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*
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*/
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void
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k_init_pim(int socket)
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{
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int v = 1;
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if (setsockopt(socket, IPPROTO_IPV6, MRT6_INIT, (char *) &v, sizeof(int)) < 0)
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log(LOG_ERR, errno, "cannot enable multicast routing in kernel");
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if (setsockopt(socket, IPPROTO_IPV6, MRT6_PIM, (char *) &v, sizeof(int)) < 0)
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log(LOG_ERR, errno, "Pim kernel initialization");
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}
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/*
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* Stops the multicast routing in the kernel and resets the MRT_ASSERT flag
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* in the kernel.
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*/
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void
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k_stop_pim(socket)
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int socket;
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{
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int v = 0;
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if (setsockopt(socket, IPPROTO_IPV6, MRT6_PIM,
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(char *) &v, sizeof(int)) < 0)
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log(LOG_ERR, errno, "Cannot reset PIM flag in kernel");
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if (setsockopt(socket, IPPROTO_IPV6, MRT6_DONE, (char *) NULL, 0) < 0)
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log(LOG_ERR, errno, "cannot disable multicast routing in kernel");
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}
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/*
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* Set the socket receiving buffer. `bufsize` is the preferred size,
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* `minsize` is the smallest acceptable size.
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*/
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void
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k_set_rcvbuf(int socket, int bufsize, int minsize)
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{
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int delta = bufsize / 2;
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int iter = 0;
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/*
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* Set the socket buffer. If we can't set it as large as we
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* want, search around to try to find the highest acceptable
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* value. The highest acceptable value being smaller than
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* minsize is a fatal error.
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*/
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if (setsockopt(socket, SOL_SOCKET, SO_RCVBUF, (char *) &bufsize, sizeof(bufsize)) < 0)
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{
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bufsize -= delta;
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while (1)
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{
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iter++;
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if (delta > 1)
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delta /= 2;
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if (setsockopt(socket, SOL_SOCKET, SO_RCVBUF, (char *) &bufsize, sizeof(bufsize)) < 0)
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bufsize -= delta;
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else
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{
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if (delta < 1024)
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break;
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bufsize += delta;
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}
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}
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if (bufsize < minsize)
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log(LOG_ERR, 0, "OS-allowed buffer size %u < app min %u",
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bufsize, minsize);
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/*NOTREACHED*/
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}
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IF_DEBUG(DEBUG_KERN)
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log(LOG_DEBUG,0,"Buffer reception size for socket %d : %d in %d iterations",socket, bufsize, iter);
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}
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/*
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* Set the default Hop Limit for the multicast packets outgoing from this
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* socket.
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*/
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void
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k_set_hlim(int socket, int h)
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{
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int hlim = h;
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if (setsockopt(socket, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, (char *) &hlim, sizeof(hlim)) < 0)
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log(LOG_ERR,errno,"k_set_hlim");
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}
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/*
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* Set/reset the IPV6_MULTICAST_LOOP. Set/reset is specified by "flag".
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*/
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void
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k_set_loop(int socket, int flag)
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{
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u_int loop;
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loop = flag;
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if (setsockopt(socket, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, (char *) &loop, sizeof(loop)) < 0)
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log(LOG_ERR,errno,"k_set_loop");
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}
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/*
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* Set the IPV6_MULTICAST_IF option on local interface which has the
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* specified index.
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*/
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void
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k_set_if(int socket, u_int ifindex)
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{
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if (setsockopt(socket, IPPROTO_IPV6, IPV6_MULTICAST_IF,
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(char *) &ifindex, sizeof(ifindex)) < 0)
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log(LOG_ERR, errno, "setsockopt IPV6_MULTICAST_IF for %s",
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ifindex2str(ifindex));
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}
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/*
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* Join a multicast grp group on local interface ifa.
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*/
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void
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k_join(int socket, struct in6_addr * grp, u_int ifindex)
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{
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struct ipv6_mreq mreq;
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mreq.ipv6mr_multiaddr = *grp;
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mreq.ipv6mr_interface = ifindex;
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if (setsockopt(socket, IPPROTO_IPV6, IPV6_JOIN_GROUP,
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(char *) &mreq, sizeof(mreq)) < 0)
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syslog(LOG_WARNING, "Cannot join group %s on interface %s",
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inet6_fmt(grp), ifindex2str(ifindex));
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}
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/*
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* Leave a multicats grp group on local interface ifa.
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*/
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void
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k_leave(int socket, struct in6_addr * grp, u_int ifindex)
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{
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struct ipv6_mreq mreq;
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mreq.ipv6mr_multiaddr = *grp;
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mreq.ipv6mr_interface = ifindex;
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if (setsockopt(socket, IPPROTO_IPV6, IPV6_LEAVE_GROUP,
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(char *) &mreq, sizeof(mreq)) < 0)
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syslog(LOG_WARNING, "Cannot leave group %s on interface %s",
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inet6_fmt(grp), ifindex2str(ifindex));
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}
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/*
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* Add a virtual interface in the kernel.
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*/
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void
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k_add_vif(int socket, vifi_t vifi, struct uvif * v)
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{
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struct mif6ctl mc;
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mc.mif6c_mifi = vifi;
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mc.mif6c_flags = v->uv_flags;
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mc.mif6c_pifi = v->uv_ifindex;
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if ((v->uv_flags & MIFF_REGISTER))
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IF_DEBUG(DEBUG_PIM_REGISTER)
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log(LOG_DEBUG,0,"register vifi : %d , register pifi : %d ", vifi, v->uv_ifindex);
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if (setsockopt(socket, IPPROTO_IPV6, MRT6_ADD_MIF,
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(char *) &mc, sizeof(mc)) < 0)
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log(LOG_ERR, errno, "setsockopt MRT6_ADD_MIF on mif %d", vifi);
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}
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/*
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* Delete a virtual interface in the kernel.
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*/
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void
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k_del_vif(int socket, vifi_t vifi)
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{
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if (setsockopt(socket, IPPROTO_IPV6, MRT6_DEL_MIF,
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(char *) &vifi, sizeof(vifi)) < 0)
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log(LOG_ERR, errno, "setsockopt MRT6_DEL_MIF on mif %d", vifi);
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}
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/*
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* Delete all MFC entries for particular routing entry from the kernel.
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*/
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int
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k_del_mfc(int socket, struct sockaddr_in6 * source, struct sockaddr_in6 * group)
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{
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struct mf6cctl mc;
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mc.mf6cc_origin = *source;
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mc.mf6cc_mcastgrp = *group;
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pim6dstat.kern_del_cache++;
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if (setsockopt(socket, IPPROTO_IPV6, MRT6_DEL_MFC, (char *) &mc, sizeof(mc)) < 0)
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{
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pim6dstat.kern_del_cache_fail++;
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log(LOG_WARNING, errno, "setsockopt MRT6_DEL_MFC");
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return FALSE;
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}
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syslog(LOG_DEBUG, "Deleted MFC entry : src %s ,grp %s", inet6_fmt(&source->sin6_addr),
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inet6_fmt(&group->sin6_addr));
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return TRUE;
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}
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/*
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* Install/modify a MFC entry in the kernel
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*/
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int
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k_chg_mfc(socket, source, group, iif, oifs, rp_addr)
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int socket;
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struct sockaddr_in6 *source;
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struct sockaddr_in6 *group;
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vifi_t iif;
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if_set *oifs;
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struct sockaddr_in6 *rp_addr;
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{
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struct mf6cctl mc;
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vifi_t vifi;
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struct uvif *v;
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mc.mf6cc_origin = *source;
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mc.mf6cc_mcastgrp = *group;
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mc.mf6cc_parent = iif;
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IF_ZERO(&mc.mf6cc_ifset);
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for (vifi = 0, v = uvifs; vifi < numvifs; vifi++, v++)
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{
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if (IF_ISSET(vifi, oifs))
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IF_SET(vifi, &mc.mf6cc_ifset);
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else
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IF_CLR(vifi, &mc.mf6cc_ifset);
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}
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#ifdef PIM_REG_KERNEL_ENCAP
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mc.mf6cc_rp_addr.s_addr = rp_addr;
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#endif
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pim6dstat.kern_add_cache++;
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if (setsockopt(socket, IPPROTO_IPV6, MRT6_ADD_MFC, (char *) &mc,
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sizeof(mc)) < 0)
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{
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pim6dstat.kern_add_cache_fail++;
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log(LOG_WARNING, errno,
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"setsockopt MRT_ADD_MFC for source %s and group %s",
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inet6_fmt(&source->sin6_addr), inet6_fmt(&group->sin6_addr));
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return (FALSE);
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}
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return (TRUE);
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}
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/*
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* Get packet counters for particular interface
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*/
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/*
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* XXX: TODO: currently not used, but keep just in case we need it later.
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*/
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int
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k_get_vif_count(vifi, retval)
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vifi_t vifi;
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struct vif_count *retval;
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{
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struct sioc_mif_req6 mreq;
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mreq.mifi = vifi;
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if (ioctl(udp_socket, SIOCGETMIFCNT_IN6, (char *) &mreq) < 0)
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{
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log(LOG_WARNING, errno, "SIOCGETMIFCNT_IN6 on vif %d", vifi);
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retval->icount = retval->ocount = retval->ibytes =
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retval->obytes = 0xffffffff;
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return (1);
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}
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retval->icount = mreq.icount;
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retval->ocount = mreq.ocount;
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retval->ibytes = mreq.ibytes;
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retval->obytes = mreq.obytes;
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return (0);
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}
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/*
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* Gets the number of packets, bytes, and number of packets arrived on wrong
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* if in the kernel for particular (S,G) entry.
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*/
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int
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k_get_sg_cnt(socket, source, group, retval)
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int socket; /* udp_socket */
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struct sockaddr_in6 *source;
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struct sockaddr_in6 *group;
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struct sg_count *retval;
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{
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struct sioc_sg_req6 sgreq;
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sgreq.src = *source;
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sgreq.grp = *group;
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if (ioctl(socket, SIOCGETSGCNT_IN6, (char *) &sgreq) < 0)
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{
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pim6dstat.kern_sgcnt_fail++;
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log(LOG_WARNING, errno, "SIOCGETSGCNT_IN6 on (%s %s)",
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inet6_fmt(&source->sin6_addr), inet6_fmt(&group->sin6_addr));
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retval->pktcnt = retval->bytecnt = retval->wrong_if = ~0; /* XXX */
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return (1);
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}
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retval->pktcnt = sgreq.pktcnt;
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retval->bytecnt = sgreq.bytecnt;
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retval->wrong_if = sgreq.wrong_if;
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return (0);
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}
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