summaryrefslogtreecommitdiffstats
path: root/c/src/exec/libnetworking/netinet/igmp.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--c/src/exec/libnetworking/netinet/igmp.c479
1 files changed, 0 insertions, 479 deletions
diff --git a/c/src/exec/libnetworking/netinet/igmp.c b/c/src/exec/libnetworking/netinet/igmp.c
deleted file mode 100644
index 2af8b7038e..0000000000
--- a/c/src/exec/libnetworking/netinet/igmp.c
+++ /dev/null
@@ -1,479 +0,0 @@
-/*
- * Copyright (c) 1988 Stephen Deering.
- * Copyright (c) 1992, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Stephen Deering of Stanford University.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * @(#)igmp.c 8.1 (Berkeley) 7/19/93
- * $Id$
- */
-
-/*
- * Internet Group Management Protocol (IGMP) routines.
- *
- * Written by Steve Deering, Stanford, May 1988.
- * Modified by Rosen Sharma, Stanford, Aug 1994.
- * Modified by Bill Fenner, Xerox PARC, Feb 1995.
- * Modified to fully comply to IGMPv2 by Bill Fenner, Oct 1995.
- *
- * MULTICAST Revision: 3.5.1.4
- */
-
-#include <sys/param.h>
-#include <sys/systm.h>
-#include <sys/mbuf.h>
-#include <sys/socket.h>
-#include <sys/protosw.h>
-#include <sys/kernel.h>
-#include <sys/sysctl.h>
-
-#include <net/if.h>
-#include <net/route.h>
-
-#include <netinet/in.h>
-#include <netinet/in_var.h>
-#include <netinet/in_systm.h>
-#include <netinet/ip.h>
-#include <netinet/ip_var.h>
-#include <netinet/igmp.h>
-#include <netinet/igmp_var.h>
-
-static struct router_info *
- find_rti __P((struct ifnet *ifp));
-
-static struct igmpstat igmpstat;
-
-SYSCTL_STRUCT(_net_inet_igmp, IGMPCTL_STATS, stats, CTLFLAG_RD,
- &igmpstat, igmpstat, "");
-
-static int igmp_timers_are_running;
-static u_long igmp_all_hosts_group;
-static u_long igmp_all_rtrs_group;
-static struct mbuf *router_alert;
-static struct router_info *Head;
-
-static void igmp_sendpkt(struct in_multi *, int, unsigned long);
-
-void
-igmp_init()
-{
- struct ipoption *ra;
-
- /*
- * To avoid byte-swapping the same value over and over again.
- */
- igmp_all_hosts_group = htonl(INADDR_ALLHOSTS_GROUP);
- igmp_all_rtrs_group = htonl(INADDR_ALLRTRS_GROUP);
-
- igmp_timers_are_running = 0;
-
- /*
- * Construct a Router Alert option to use in outgoing packets
- */
- MGET(router_alert, M_DONTWAIT, MT_DATA);
- ra = mtod(router_alert, struct ipoption *);
- ra->ipopt_dst.s_addr = 0;
- ra->ipopt_list[0] = IPOPT_RA; /* Router Alert Option */
- ra->ipopt_list[1] = 0x04; /* 4 bytes long */
- ra->ipopt_list[2] = 0x00;
- ra->ipopt_list[3] = 0x00;
- router_alert->m_len = sizeof(ra->ipopt_dst) + ra->ipopt_list[1];
-
- Head = (struct router_info *) 0;
-}
-
-static struct router_info *
-find_rti(ifp)
- struct ifnet *ifp;
-{
- register struct router_info *rti = Head;
-
-#ifdef IGMP_DEBUG
- printf("[igmp.c, _find_rti] --> entering \n");
-#endif
- while (rti) {
- if (rti->rti_ifp == ifp) {
-#ifdef IGMP_DEBUG
- printf("[igmp.c, _find_rti] --> found old entry \n");
-#endif
- return rti;
- }
- rti = rti->rti_next;
- }
- MALLOC(rti, struct router_info *, sizeof *rti, M_MRTABLE, M_NOWAIT);
- rti->rti_ifp = ifp;
- rti->rti_type = IGMP_V2_ROUTER;
- rti->rti_time = 0;
- rti->rti_next = Head;
- Head = rti;
-#ifdef IGMP_DEBUG
- printf("[igmp.c, _find_rti] --> created an entry \n");
-#endif
- return rti;
-}
-
-void
-igmp_input(m, iphlen)
- register struct mbuf *m;
- register int iphlen;
-{
- register struct igmp *igmp;
- register struct ip *ip;
- register int igmplen;
- register struct ifnet *ifp = m->m_pkthdr.rcvif;
- register int minlen;
- register struct in_multi *inm;
- register struct in_ifaddr *ia;
- struct in_multistep step;
- struct router_info *rti;
-
- int timer; /** timer value in the igmp query header **/
-
- ++igmpstat.igps_rcv_total;
-
- ip = mtod(m, struct ip *);
- igmplen = ip->ip_len;
-
- /*
- * Validate lengths
- */
- if (igmplen < IGMP_MINLEN) {
- ++igmpstat.igps_rcv_tooshort;
- m_freem(m);
- return;
- }
- minlen = iphlen + IGMP_MINLEN;
- if ((m->m_flags & M_EXT || m->m_len < minlen) &&
- (m = m_pullup(m, minlen)) == 0) {
- ++igmpstat.igps_rcv_tooshort;
- return;
- }
-
- /*
- * Validate checksum
- */
- m->m_data += iphlen;
- m->m_len -= iphlen;
- igmp = mtod(m, struct igmp *);
- if (in_cksum(m, igmplen)) {
- ++igmpstat.igps_rcv_badsum;
- m_freem(m);
- return;
- }
- m->m_data -= iphlen;
- m->m_len += iphlen;
-
- ip = mtod(m, struct ip *);
- timer = igmp->igmp_code * PR_FASTHZ / IGMP_TIMER_SCALE;
- rti = find_rti(ifp);
-
- /*
- * In the IGMPv2 specification, there are 3 states and a flag.
- *
- * In Non-Member state, we simply don't have a membership record.
- * In Delaying Member state, our timer is running (inm->inm_timer)
- * In Idle Member state, our timer is not running (inm->inm_timer==0)
- *
- * The flag is inm->inm_state, it is set to IGMP_OTHERMEMBER if
- * we have heard a report from another member, or IGMP_IREPORTEDLAST
- * if I sent the last report.
- */
- switch (igmp->igmp_type) {
-
- case IGMP_MEMBERSHIP_QUERY:
- ++igmpstat.igps_rcv_queries;
-
- if (ifp->if_flags & IFF_LOOPBACK)
- break;
-
- if (igmp->igmp_code == 0) {
- /*
- * Old router. Remember that the querier on this
- * interface is old, and set the timer to the
- * value in RFC 1112.
- */
-
- rti->rti_type = IGMP_V1_ROUTER;
- rti->rti_time = 0;
-
- timer = IGMP_MAX_HOST_REPORT_DELAY * PR_FASTHZ;
-
- if (ip->ip_dst.s_addr != igmp_all_hosts_group ||
- igmp->igmp_group.s_addr != 0) {
- ++igmpstat.igps_rcv_badqueries;
- m_freem(m);
- return;
- }
- } else {
- /*
- * New router. Simply do the new validity check.
- */
-
- if (igmp->igmp_group.s_addr != 0 &&
- !IN_MULTICAST(ntohl(igmp->igmp_group.s_addr))) {
- ++igmpstat.igps_rcv_badqueries;
- m_freem(m);
- return;
- }
- }
-
- /*
- * - Start the timers in all of our membership records
- * that the query applies to for the interface on
- * which the query arrived excl. those that belong
- * to the "all-hosts" group (224.0.0.1).
- * - Restart any timer that is already running but has
- * a value longer than the requested timeout.
- * - Use the value specified in the query message as
- * the maximum timeout.
- */
- IN_FIRST_MULTI(step, inm);
- while (inm != NULL) {
- if (inm->inm_ifp == ifp &&
- inm->inm_addr.s_addr != igmp_all_hosts_group &&
- (igmp->igmp_group.s_addr == 0 ||
- igmp->igmp_group.s_addr == inm->inm_addr.s_addr)) {
- if (inm->inm_timer == 0 ||
- inm->inm_timer > timer) {
- inm->inm_timer =
- IGMP_RANDOM_DELAY(timer);
- igmp_timers_are_running = 1;
- }
- }
- IN_NEXT_MULTI(step, inm);
- }
-
- break;
-
- case IGMP_V1_MEMBERSHIP_REPORT:
- case IGMP_V2_MEMBERSHIP_REPORT:
- /*
- * For fast leave to work, we have to know that we are the
- * last person to send a report for this group. Reports
- * can potentially get looped back if we are a multicast
- * router, so discard reports sourced by me.
- */
- IFP_TO_IA(ifp, ia);
- if (ia && ip->ip_src.s_addr == IA_SIN(ia)->sin_addr.s_addr)
- break;
-
- ++igmpstat.igps_rcv_reports;
-
- if (ifp->if_flags & IFF_LOOPBACK)
- break;
-
- if (!IN_MULTICAST(ntohl(igmp->igmp_group.s_addr))) {
- ++igmpstat.igps_rcv_badreports;
- m_freem(m);
- return;
- }
-
- /*
- * KLUDGE: if the IP source address of the report has an
- * unspecified (i.e., zero) subnet number, as is allowed for
- * a booting host, replace it with the correct subnet number
- * so that a process-level multicast routing demon can
- * determine which subnet it arrived from. This is necessary
- * to compensate for the lack of any way for a process to
- * determine the arrival interface of an incoming packet.
- */
- if ((ntohl(ip->ip_src.s_addr) & IN_CLASSA_NET) == 0)
- if (ia) ip->ip_src.s_addr = htonl(ia->ia_subnet);
-
- /*
- * If we belong to the group being reported, stop
- * our timer for that group.
- */
- IN_LOOKUP_MULTI(igmp->igmp_group, ifp, inm);
-
- if (inm != NULL) {
- inm->inm_timer = 0;
- ++igmpstat.igps_rcv_ourreports;
-
- inm->inm_state = IGMP_OTHERMEMBER;
- }
-
- break;
- }
-
- /*
- * Pass all valid IGMP packets up to any process(es) listening
- * on a raw IGMP socket.
- */
- rip_input(m, iphlen);
-}
-
-void
-igmp_joingroup(inm)
- struct in_multi *inm;
-{
- int s = splnet();
-
- if (inm->inm_addr.s_addr == igmp_all_hosts_group
- || inm->inm_ifp->if_flags & IFF_LOOPBACK) {
- inm->inm_timer = 0;
- inm->inm_state = IGMP_OTHERMEMBER;
- } else {
- inm->inm_rti = find_rti(inm->inm_ifp);
- igmp_sendpkt(inm, inm->inm_rti->rti_type, 0);
- inm->inm_timer = IGMP_RANDOM_DELAY(
- IGMP_MAX_HOST_REPORT_DELAY*PR_FASTHZ);
- inm->inm_state = IGMP_IREPORTEDLAST;
- igmp_timers_are_running = 1;
- }
- splx(s);
-}
-
-void
-igmp_leavegroup(inm)
- struct in_multi *inm;
-{
- if (inm->inm_state == IGMP_IREPORTEDLAST &&
- inm->inm_addr.s_addr != igmp_all_hosts_group &&
- !(inm->inm_ifp->if_flags & IFF_LOOPBACK) &&
- inm->inm_rti->rti_type != IGMP_V1_ROUTER)
- igmp_sendpkt(inm, IGMP_V2_LEAVE_GROUP, igmp_all_rtrs_group);
-}
-
-void
-igmp_fasttimo()
-{
- register struct in_multi *inm;
- struct in_multistep step;
- int s;
-
- /*
- * Quick check to see if any work needs to be done, in order
- * to minimize the overhead of fasttimo processing.
- */
-
- if (!igmp_timers_are_running)
- return;
-
- s = splnet();
- igmp_timers_are_running = 0;
- IN_FIRST_MULTI(step, inm);
- while (inm != NULL) {
- if (inm->inm_timer == 0) {
- /* do nothing */
- } else if (--inm->inm_timer == 0) {
- igmp_sendpkt(inm, inm->inm_rti->rti_type, 0);
- inm->inm_state = IGMP_IREPORTEDLAST;
- } else {
- igmp_timers_are_running = 1;
- }
- IN_NEXT_MULTI(step, inm);
- }
- splx(s);
-}
-
-void
-igmp_slowtimo()
-{
- int s = splnet();
- register struct router_info *rti = Head;
-
-#ifdef IGMP_DEBUG
- printf("[igmp.c,_slowtimo] -- > entering \n");
-#endif
- while (rti) {
- if (rti->rti_type == IGMP_V1_ROUTER) {
- rti->rti_time++;
- if (rti->rti_time >= IGMP_AGE_THRESHOLD) {
- rti->rti_type = IGMP_V2_ROUTER;
- }
- }
- rti = rti->rti_next;
- }
-#ifdef IGMP_DEBUG
- printf("[igmp.c,_slowtimo] -- > exiting \n");
-#endif
- splx(s);
-}
-
-static struct route igmprt;
-
-static void
-igmp_sendpkt(inm, type, addr)
- struct in_multi *inm;
- int type;
- unsigned long addr;
-{
- struct mbuf *m;
- struct igmp *igmp;
- struct ip *ip;
- struct ip_moptions imo;
-
- MGETHDR(m, M_DONTWAIT, MT_HEADER);
- if (m == NULL)
- return;
-
- m->m_pkthdr.rcvif = loif;
- m->m_pkthdr.len = sizeof(struct ip) + IGMP_MINLEN;
- MH_ALIGN(m, IGMP_MINLEN + sizeof(struct ip));
- m->m_data += sizeof(struct ip);
- m->m_len = IGMP_MINLEN;
- igmp = mtod(m, struct igmp *);
- igmp->igmp_type = type;
- igmp->igmp_code = 0;
- igmp->igmp_group = inm->inm_addr;
- igmp->igmp_cksum = 0;
- igmp->igmp_cksum = in_cksum(m, IGMP_MINLEN);
-
- m->m_data -= sizeof(struct ip);
- m->m_len += sizeof(struct ip);
- ip = mtod(m, struct ip *);
- ip->ip_tos = 0;
- ip->ip_len = sizeof(struct ip) + IGMP_MINLEN;
- ip->ip_off = 0;
- ip->ip_p = IPPROTO_IGMP;
- ip->ip_src.s_addr = INADDR_ANY;
- ip->ip_dst.s_addr = addr ? addr : igmp->igmp_group.s_addr;
-
- imo.imo_multicast_ifp = inm->inm_ifp;
- imo.imo_multicast_ttl = 1;
- imo.imo_multicast_vif = -1;
- /*
- * Request loopback of the report if we are acting as a multicast
- * router, so that the process-level routing demon can hear it.
- */
- imo.imo_multicast_loop = (ip_mrouter != NULL);
-
- /*
- * XXX
- * Do we have to worry about reentrancy here? Don't think so.
- */
- ip_output(m, router_alert, &igmprt, 0, &imo);
-
- ++igmpstat.igps_snd_reports;
-}
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-25 05:31:47 +0000