/**
* Updates the Kernel routing table. If activate is 1, the route
* is (re-)activated. If activate is false, the route is removed.
*/
int internUpdateKernelRoute(struct RouteTable *route, int activate)
{
struct MRouteDesc mrDesc;
struct IfDesc *Dp;
unsigned Ix;
struct IfDesc* upstrIf;
// Get the upstream VIF...
upstrIf = getIfByIx( upStreamVif );
if(upstrIf == NULL)
atlog(LOG_ERR, 0 ,"FATAL: Unable to get Upstream IF.");
if( IN6_ARE_ADDR_EQUAL( &(route->group), &allzero_addr ) )
return 1;
if( IN6_ARE_ADDR_EQUAL( &(route->originAddr), &allzero_addr ) )
return 1;
// Build route descriptor from table entry...
// Set the source address and group address...
mrDesc.McAdr.sin6_addr = route->group;
mrDesc.McAdr.sin6_family = AF_INET6;
mrDesc.McAdr.sin6_flowinfo = 0;
mrDesc.McAdr.sin6_port = 0;
mrDesc.McAdr.sin6_scope_id = upstrIf->index;
mrDesc.OriginAdr.sin6_addr = route->originAddr;
// clear output interfaces
memset( mrDesc.TtlVc, 0, sizeof( mrDesc.TtlVc ) );
IF_DEBUG atlog(LOG_DEBUG, 0, "Vif bits : 0x%08x", route->vifBits);
for( Ix = 0 ; Ix < MAXMIFS; Ix++ )
{
Dp = getIfDescFromMifByIx(Ix);
if (Dp == NULL)
break;
if ( Dp->state == IF_STATE_UPSTREAM )
mrDesc.InVif = Ix;
else if(BIT_TST(route->vifBits, Dp->index))
{
mrDesc.TtlVc[ Ix ] = Dp->threshold;
}
}
// Do the actual Kernel route update...
if(activate)
{
// Add route in kernel...
addMRoute( &mrDesc );
}
else
{
// Delete the route from Kernel...
delMRoute( &mrDesc );
}
return 1;
}
void sendJoinLeaveUpstream(struct RouteTable* route, int join)
{
struct IfDesc* upstrIf;
// Get the upstream VIF...
upstrIf = getIfByIx( upStreamVif );
if(upstrIf == NULL)
{
atlog(LOG_ERR, 0 ,"FATAL: Unable to get Upstream IF.");
}
// Send join or leave request...
if(join)
{
// Only join a group if there are listeners downstream...
if(route->vifBits > 0)
{
joinMcGroup( getMcGroupSock(), upstrIf, &route->group );
route->upstrState = ROUTESTATE_JOINED;
}
}
else
{
// Only leave if group is not left already...
if(route->upstrState != ROUTESTATE_NOTJOINED)
{
leaveMcGroup( getMcGroupSock(), upstrIf, &route->group );
route->upstrState = ROUTESTATE_NOTJOINED;
}
}
}
/**
* Internal function to send join or leave requests for
* a specified route upstream...
*/
void sendJoinLeaveUpstream(struct RouteTable* route, int join) {
struct IfDesc* upstrIf;
// Get the upstream VIF...
upstrIf = getIfByIx( upStreamVif );
if(upstrIf == NULL) {
my_log(LOG_ERR, 0 ,"FATAL: Unable to get Upstream IF.");
}
// Check if there is a white list for the upstram VIF
if (upstrIf->allowedgroups != NULL) {
uint32_t group = route->group;
struct SubnetList* sn;
// Check if this Request is legit to be forwarded to upstream
for(sn = upstrIf->allowedgroups; sn != NULL; sn = sn->next)
if((group & sn->subnet_mask) == sn->subnet_addr)
// Forward is OK...
break;
if (sn == NULL) {
my_log(LOG_INFO, 0, "The group address %s may not be forwarded upstream. Ignoring.", inetFmt(group, s1));
return;
}
}
// Send join or leave request...
if(join) {
// Only join a group if there are listeners downstream...
if(route->vifBits > 0) {
my_log(LOG_DEBUG, 0, "Joining group %s upstream on IF address %s",
inetFmt(route->group, s1),
inetFmt(upstrIf->InAdr.s_addr, s2));
//k_join(route->group, upstrIf->InAdr.s_addr);
joinMcGroup( getMcGroupSock(), upstrIf, route->group );
route->upstrState = ROUTESTATE_JOINED;
} else {
my_log(LOG_DEBUG, 0, "No downstream listeners for group %s. No join sent.",
inetFmt(route->group, s1));
}
} else {
// Only leave if group is not left already...
if(route->upstrState != ROUTESTATE_NOTJOINED) {
my_log(LOG_DEBUG, 0, "Leaving group %s upstream on IF address %s",
inetFmt(route->group, s1),
inetFmt(upstrIf->InAdr.s_addr, s2));
//k_leave(route->group, upstrIf->InAdr.s_addr);
leaveMcGroup( getMcGroupSock(), upstrIf, route->group );
route->upstrState = ROUTESTATE_NOTJOINED;
}
}
}
/**
* Counts the number of interfaces a given route is active on
*/
int numberOfInterfaces(struct RouteTable *croute) {
int Ix;
struct IfDesc *Dp;
int result = 0;
// Loop through all interfaces
for ( Ix = 0; (Dp = getIfByIx(Ix)); Ix++ ) {
// If the interface is used by the route, increase counter
if(BIT_TST(croute->vifBits, Dp->index)) {
result++;
}
}
my_log(LOG_DEBUG, 0, "counted %d interfaces", result);
return result;
}
/**
* Updates the Kernel routing table. If activate is 1, the route
* is (re-)activated. If activate is false, the route is removed.
*/
int internUpdateKernelRoute(struct RouteTable *route, int activate) {
struct MRouteDesc mrDesc;
struct IfDesc *Dp;
unsigned Ix;
int i;
for (int i = 0; i < MAX_ORIGINS; i++) {
if (route->originAddrs[i] == 0 || route->upstrVif == -1) {
continue;
}
// Build route descriptor from table entry...
// Set the source address and group address...
mrDesc.McAdr.s_addr = route->group;
mrDesc.OriginAdr.s_addr = route->originAddrs[i];
// clear output interfaces
memset( mrDesc.TtlVc, 0, sizeof( mrDesc.TtlVc ) );
my_log(LOG_DEBUG, 0, "Vif bits : 0x%08x", route->vifBits);
mrDesc.InVif = route->upstrVif;
// Set the TTL's for the route descriptor...
for ( Ix = 0; (Dp = getIfByIx(Ix)); Ix++ ) {
if(Dp->state == IF_STATE_UPSTREAM) {
continue;
}
else if(BIT_TST(route->vifBits, Dp->index)) {
my_log(LOG_DEBUG, 0, "Setting TTL for Vif %d to %d", Dp->index, Dp->threshold);
mrDesc.TtlVc[ Dp->index ] = Dp->threshold;
}
}
// Do the actual Kernel route update...
if(activate) {
// Add route in kernel...
addMRoute( &mrDesc );
} else {
// Delete the route from Kernel...
delMRoute( &mrDesc );
}
}
return 1;
}
/**
* Appends extra VIF configuration from config file.
*/
void configureVifs() {
unsigned Ix;
struct IfDesc *Dp;
struct vifconfig *confPtr;
// If no config is availible, just return...
if(vifconf == NULL) {
return;
}
// Loop through all VIFs...
for ( Ix = 0; (Dp = getIfByIx(Ix)); Ix++ ) {
if ( Dp->InAdr.s_addr && ! (Dp->Flags & IFF_LOOPBACK) ) {
// Now try to find a matching config...
for( confPtr = vifconf; confPtr; confPtr = confPtr->next) {
// I the VIF names match...
if(strcmp(Dp->Name, confPtr->name)==0) {
struct SubnetList *vifLast;
my_log(LOG_DEBUG, 0, "Found config for %s", Dp->Name);
// Set the VIF state
Dp->state = confPtr->state;
Dp->threshold = confPtr->threshold;
Dp->ratelimit = confPtr->ratelimit;
// Go to last allowed net on VIF...
for(vifLast = Dp->allowednets; vifLast->next; vifLast = vifLast->next);
// Insert the configured nets...
vifLast->next = confPtr->allowednets;
Dp->allowedgroups = confPtr->allowedgroups;
break;
}
}
}
}
}
/**
* Sends a general membership query on downstream VIFs
*/
void sendGeneralMembershipQuery() {
struct Config *conf = getCommonConfig();
struct IfDesc *Dp;
unsigned Ix;
#ifdef RALINK_ESW_SUPPORT
clear_all_entries_report();
#endif
// Loop through all downstream vifs...
for ( Ix = 0; (Dp = getIfByIx(Ix)); Ix++ ) {
if ( Dp->InAdr.s_addr && ! (Dp->Flags & IFF_LOOPBACK) ) {
if(Dp->state == IF_STATE_DOWNSTREAM) {
// Send the membership query...
sendIgmp(Dp->InAdr.s_addr, allhosts_group,
IGMP_MEMBERSHIP_QUERY,
conf->queryResponseInterval * IGMP_TIMER_SCALE, 0, 0);
my_log(LOG_DEBUG, 0,
"Sent membership query from %s to %s. Delay: %d",
inetFmt(Dp->InAdr.s_addr,s1),
inetFmt(allhosts_group,s2),
conf->queryResponseInterval);
}
}
}
// Install timer for aging active routes.
timer_setTimer(conf->queryResponseInterval, ageActiveRoutes, NULL);
// Install timer for next general query...
if(conf->startupQueryCount>0) {
// Use quick timer...
timer_setTimer(conf->startupQueryInterval, sendGeneralMembershipQuery, NULL);
// Decrease startup counter...
conf->startupQueryCount--;
}
else {
// Use slow timer...
timer_setTimer(conf->queryInterval, sendGeneralMembershipQuery, NULL);
}
}
/**
* Initializes the routing table.
*/
void initRouteTable()
{
unsigned Ix;
struct IfDesc *Dp;
// Clear routing table...
routing_table = NULL;
// Join the all routers group on downstream vifs...
for ( Ix = 0; (Dp = getIfByIx( Ix )); Ix++ )
{
// If this is a downstream vif, we should join the All routers group...
if( Dp->state == IF_STATE_DOWNSTREAM )
{
/*
IF_DEBUG atlog(LOG_DEBUG, 0, "Joining all-routers group %s on vif %s",
inetFmt(allrouters_group,s1),inetFmt(Dp->InAdr.s_addr,s2));
*/
//joinMcGroup( getMcGroupSock(), Dp, &allrouters_group );
}
}
}
/**
* Initializes the routing table.
*/
void initRouteTable() {
unsigned Ix;
struct IfDesc *Dp;
// Clear routing table...
routing_table = NULL;
// Join the all routers group on downstream vifs...
for ( Ix = 0; (Dp = getIfByIx(Ix)); Ix++ ) {
// If this is a downstream vif, we should join the All routers group...
if( Dp->InAdr.s_addr && ! (Dp->Flags & IFF_LOOPBACK) && Dp->state == IF_STATE_DOWNSTREAM) {
my_log(LOG_DEBUG, 0, "Joining all-routers group %s on vif %s",
inetFmt(allrouters_group,s1),inetFmt(Dp->InAdr.s_addr,s2));
//k_join(allrouters_group, Dp->InAdr.s_addr);
joinMcGroup( getMcGroupSock(), Dp, allrouters_group );
my_log(LOG_DEBUG, 0, "Joining all igmpv3 multicast routers group %s on vif %s",
inetFmt(alligmp3_group,s1),inetFmt(Dp->InAdr.s_addr,s2));
joinMcGroup( getMcGroupSock(), Dp, alligmp3_group );
}
}
}
/**
* Handles the initial startup of the daemon.
*/
int igmpProxyInit() {
struct sigaction sa;
int Err;
sa.sa_handler = signalHandler;
sa.sa_flags = 0; /* Interrupt system calls */
sigemptyset(&sa.sa_mask);
sigaction(SIGTERM, &sa, NULL);
sigaction(SIGINT, &sa, NULL);
// Loads configuration for Physical interfaces...
buildIfVc();
// Configures IF states and settings
configureVifs();
switch ( Err = enableMRouter() ) {
case 0: break;
case EADDRINUSE: my_log( LOG_ERR, EADDRINUSE, "MC-Router API already in use" ); break;
default: my_log( LOG_ERR, Err, "MRT_INIT failed" );
}
/* create VIFs for all IP, non-loop interfaces
*/
{
unsigned Ix;
struct IfDesc *Dp;
int vifcount = 0;
upStreamVif = -1;
for ( Ix = 0; (Dp = getIfByIx(Ix)); Ix++ ) {
if ( Dp->InAdr.s_addr && ! (Dp->Flags & IFF_LOOPBACK) ) {
if(Dp->state == IF_STATE_UPSTREAM) {
if(upStreamVif == -1) {
upStreamVif = Ix;
} else {
my_log(LOG_ERR, 0, "Vif #%d was already upstream. Cannot set VIF #%d as upstream as well.",
upStreamVif, Ix);
}
}
addVIF( Dp );
vifcount++;
}
}
// If there is only one VIF, or no defined upstream VIF, we send an error.
if(vifcount < 2 || upStreamVif < 0) {
my_log(LOG_ERR, 0, "There must be at least 2 Vif's where one is upstream.");
}
}
// Initialize IGMP
initIgmp();
// Initialize Routing table
initRouteTable();
// Initialize timer
callout_init();
return 1;
}
/**
* Process a newly received IGMP packet that is sitting in the input
* packet buffer.
*/
void acceptIgmp(int recvlen) {
register uint32_t src, dst, group;
struct ip *ip;
struct igmp *igmp;
struct igmpv3_report *igmpv3;
struct igmpv3_grec *grec;
int ipdatalen, iphdrlen, ngrec, nsrcs;
if (recvlen < sizeof(struct ip)) {
my_log(LOG_WARNING, 0,
"received packet too short (%u bytes) for IP header", recvlen);
return;
}
ip = (struct ip *)recv_buf;
src = ip->ip_src.s_addr;
dst = ip->ip_dst.s_addr;
/* filter local multicast 239.255.255.250 */
if (dst == htonl(0xEFFFFFFA))
{
my_log(LOG_NOTICE, 0, "The IGMP message was local multicast. Ignoring.");
return;
}
/*
* this is most likely a message from the kernel indicating that
* a new src grp pair message has arrived and so, it would be
* necessary to install a route into the kernel for this.
*/
if (ip->ip_p == 0) {
if (src == 0 || dst == 0) {
my_log(LOG_WARNING, 0, "kernel request not accurate");
}
else {
struct IfDesc *checkVIF;
// Check if the source address matches a valid address on upstream vif.
checkVIF = getIfByIx( upStreamVif );
if(checkVIF == 0) {
my_log(LOG_ERR, 0, "Upstream VIF was null.");
return;
}
else if(src == checkVIF->InAdr.s_addr) {
my_log(LOG_NOTICE, 0, "Route activation request from %s for %s is from myself. Ignoring.",
inetFmt(src, s1), inetFmt(dst, s2));
return;
}
else if(!isAdressValidForIf(checkVIF, src)) {
my_log(LOG_WARNING, 0, "The source address %s for group %s, is not in any valid net for upstream VIF.",
inetFmt(src, s1), inetFmt(dst, s2));
return;
}
// Activate the route.
my_log(LOG_DEBUG, 0, "Route activate request from %s to %s",
inetFmt(src,s1), inetFmt(dst,s2));
activateRoute(dst, src);
}
return;
}
iphdrlen = ip->ip_hl << 2;
ipdatalen = ip_data_len(ip);
if (iphdrlen + ipdatalen != recvlen) {
my_log(LOG_WARNING, 0,
"received packet from %s shorter (%u bytes) than hdr+data length (%u+%u)",
inetFmt(src, s1), recvlen, iphdrlen, ipdatalen);
return;
}
igmp = (struct igmp *)(recv_buf + iphdrlen);
if ((ipdatalen < IGMP_MINLEN) ||
(igmp->igmp_type == IGMP_V3_MEMBERSHIP_REPORT && ipdatalen <= IGMPV3_MINLEN)) {
my_log(LOG_WARNING, 0,
"received IP data field too short (%u bytes) for IGMP, from %s",
ipdatalen, inetFmt(src, s1));
return;
}
my_log(LOG_NOTICE, 0, "RECV %s from %-15s to %s",
igmpPacketKind(igmp->igmp_type, igmp->igmp_code),
inetFmt(src, s1), inetFmt(dst, s2) );
switch (igmp->igmp_type) {
case IGMP_V1_MEMBERSHIP_REPORT:
case IGMP_V2_MEMBERSHIP_REPORT:
group = igmp->igmp_group.s_addr;
acceptGroupReport(src, group, igmp->igmp_type);
return;
case IGMP_V3_MEMBERSHIP_REPORT:
igmpv3 = (struct igmpv3_report *)(recv_buf + iphdrlen);
grec = &igmpv3->igmp_grec[0];
ngrec = ntohs(igmpv3->igmp_ngrec);
while (ngrec--) {
if ((uint8_t *)igmpv3 + ipdatalen < (uint8_t *)grec + sizeof(*grec))
break;
group = grec->grec_mca.s_addr;
nsrcs = ntohs(grec->grec_nsrcs);
switch (grec->grec_type) {
case IGMPV3_MODE_IS_INCLUDE:
case IGMPV3_CHANGE_TO_INCLUDE:
if (nsrcs == 0) {
acceptLeaveMessage(src, group);
break;
} /* else fall through */
case IGMPV3_MODE_IS_EXCLUDE:
case IGMPV3_CHANGE_TO_EXCLUDE:
case IGMPV3_ALLOW_NEW_SOURCES:
acceptGroupReport(src, group, IGMP_V2_MEMBERSHIP_REPORT);
break;
case IGMPV3_BLOCK_OLD_SOURCES:
break;
default:
my_log(LOG_INFO, 0,
"ignoring unknown IGMPv3 group record type %x from %s to %s for %s",
grec->grec_type, inetFmt(src, s1), inetFmt(dst, s2),
inetFmt(group, s3));
break;
}
grec = (struct igmpv3_grec *)
(&grec->grec_src[nsrcs] + grec->grec_auxwords * 4);
}
return;
case IGMP_V2_LEAVE_GROUP:
group = igmp->igmp_group.s_addr;
acceptLeaveMessage(src, group);
return;
case IGMP_MEMBERSHIP_QUERY:
return;
default:
my_log(LOG_INFO, 0,
"ignoring unknown IGMP message type %x from %s to %s",
igmp->igmp_type, inetFmt(src, s1),
inetFmt(dst, s2));
return;
}
}
/**
* Process a newly received IGMP packet that is sitting in the input
* packet buffer.
*/
void acceptIgmp(int recvlen) {
register uint32_t src, dst, group;
struct ip *ip;
struct igmp *igmp;
int ipdatalen, iphdrlen, igmpdatalen;
if (recvlen < sizeof(struct ip)) {
my_log(LOG_WARNING, 0,
"received packet too short (%u bytes) for IP header", recvlen);
return;
}
ip = (struct ip *)recv_buf;
src = ip->ip_src.s_addr;
dst = ip->ip_dst.s_addr;
/*
* this is most likely a message from the kernel indicating that
* a new src grp pair message has arrived and so, it would be
* necessary to install a route into the kernel for this.
*/
if (ip->ip_p == 0) {
if (src == 0 || dst == 0) {
my_log(LOG_WARNING, 0, "kernel request not accurate");
}
else {
struct IfDesc *checkVIF;
// Check if the source address matches a valid address on upstream vif.
checkVIF = getIfByIx( upStreamVif );
if(checkVIF == 0) {
my_log(LOG_ERR, 0, "Upstream VIF was null.");
return;
}
else if(src == checkVIF->InAdr.s_addr) {
my_log(LOG_NOTICE, 0, "Route activation request from %s for %s is from myself. Ignoring.",
inetFmt(src, s1), inetFmt(dst, s2));
return;
}
/* else if(!isAdressValidForIf(checkVIF, src)) {
my_log(LOG_WARNING, 0, "The source address %s for group %s, is not in any valid net for upstream VIF.",
inetFmt(src, s1), inetFmt(dst, s2));
return;
}*/
// Activate the route.
my_log(LOG_DEBUG, 0, "Route activate request from %s to %s",
inetFmt(src,s1), inetFmt(dst,s2));
activateRoute(dst, src);
}
return;
}
iphdrlen = ip->ip_hl << 2;
ipdatalen = ip_data_len(ip);
if (iphdrlen + ipdatalen != recvlen) {
my_log(LOG_WARNING, 0,
"received packet from %s shorter (%u bytes) than hdr+data length (%u+%u)",
inetFmt(src, s1), recvlen, iphdrlen, ipdatalen);
return;
}
igmp = (struct igmp *)(recv_buf + iphdrlen);
group = igmp->igmp_group.s_addr;
igmpdatalen = ipdatalen - IGMP_MINLEN;
if (igmpdatalen < 0) {
my_log(LOG_WARNING, 0,
"received IP data field too short (%u bytes) for IGMP, from %s",
ipdatalen, inetFmt(src, s1));
return;
}
my_log(LOG_NOTICE, 0, "RECV %s from %-15s to %s",
igmpPacketKind(igmp->igmp_type, igmp->igmp_code),
inetFmt(src, s1), inetFmt(dst, s2) );
switch (igmp->igmp_type) {
case IGMP_V1_MEMBERSHIP_REPORT:
case IGMP_V2_MEMBERSHIP_REPORT:
acceptGroupReport(src, group, igmp->igmp_type);
return;
case IGMP_V2_LEAVE_GROUP:
acceptLeaveMessage(src, group);
return;
case IGMP_MEMBERSHIP_QUERY:
return;
default:
my_log(LOG_INFO, 0,
"ignoring unknown IGMP message type %x from %s to %s",
igmp->igmp_type, inetFmt(src, s1),
inetFmt(dst, s2));
return;
}
}
/**
* Process a newly received IGMP packet that is sitting in the input
* packet buffer.
*/
void acceptIgmp(int recvlen) {
register uint32 src, dst, group;
struct ip *ip;
struct igmp *igmp;
int ipdatalen, iphdrlen, igmpdatalen;
if (recvlen < sizeof(struct ip)) {
log_msg(LOG_WARNING, 0,
"received packet too short (%u bytes) for IP header", recvlen);
return;
}
ip = (struct ip *)recv_buf;
src = ip->ip_src.s_addr;
dst = ip->ip_dst.s_addr;
//IF_DEBUG log_msg(LOG_DEBUG, 0, "Got a IGMP request to process...");
/*
* this is most likely a message from the kernel indicating that
* a new src grp pair message has arrived and so, it would be
* necessary to install a route into the kernel for this.
*/
if (ip->ip_p == 0) {
if (src == 0 || dst == 0) {
log_msg(LOG_WARNING, 0, "kernel request not accurate");
}
else {
#if 0 /*remove for cd-router test wan remoteHostIp is different subnet with wan mask*/
struct IfDesc *checkVIF;
// Check if the source address matches a valid address on upstream vif.
checkVIF = getIfByIx( upStreamVif );
if(checkVIF == 0) {
log_msg(LOG_ERR, 0, "Upstream VIF was null.");
return;
}
else if(src == checkVIF->InAdr.s_addr) {
log_msg(LOG_NOTICE, 0, "Route activation request from %s for %s is from myself. Ignoring.",
inetFmt(src, s1), inetFmt(dst, s2));
return;
}
else if(!isAdressValidForIf(checkVIF, src)) {
log_msg(LOG_WARNING, 0, "The source address %s for group %s, is not in any valid net for upstream VIF.",
inetFmt(src, s1), inetFmt(dst, s2));
return;
}
#else
if ((dst & LOCAL_PRIVATE_NETMASK) == LOCAL_PRIVATE_NETMASK){
IF_DEBUG log_msg(LOG_DEBUG, 0, "Got private dst multicast address %s passthrough return ",
inetFmt(dst,s2));
return;
}
#endif
// Activate the route.
IF_DEBUG log_msg(LOG_DEBUG, 0, "Route activate request from %s to %s",
inetFmt(src,s1), inetFmt(dst,s2));
activateRoute(dst, src);
}
return;
}
iphdrlen = ip->ip_hl << 2;
ipdatalen = ntohs(ip->ip_len) - iphdrlen;
if (iphdrlen + ipdatalen != recvlen) {
log_msg(LOG_WARNING, 0,
"received packet from %s shorter (%u bytes) than hdr+data length (%u+%u)",
inetFmt(src, s1), recvlen, iphdrlen, ipdatalen);
return;
}
igmp = (struct igmp *)(recv_buf + iphdrlen);
group = igmp->igmp_group.s_addr;
igmpdatalen = ipdatalen - IGMP_MINLEN;
if (igmpdatalen < 0) {
log_msg(LOG_WARNING, 0,
"received IP data field too short (%u bytes) for IGMP, from %s",
ipdatalen, inetFmt(src, s1));
return;
}
log_msg(LOG_NOTICE, 0, "RECV %s from %-15s to %s",
igmpPacketKind(igmp->igmp_type, igmp->igmp_code),
inetFmt(src, s1), inetFmt(dst, s2) );
switch (igmp->igmp_type) {
case IGMP_V1_MEMBERSHIP_REPORT:
case IGMP_V2_MEMBERSHIP_REPORT:
acceptGroupReport(src, group, igmp->igmp_type);
return;
case IGMP_V2_LEAVE_GROUP:
acceptLeaveMessage(src, group);
return;
/*
case IGMP_MEMBERSHIP_QUERY:
//accept_membership_query(src, dst, group, igmp->igmp_code);
return;
*/
default:
log_msg(LOG_INFO, 0,
"ignoring unknown IGMP message type %x from %s to %s",
igmp->igmp_type, inetFmt(src, s1),
inetFmt(dst, s2));
return;
}
}
/**
* Adds a specified route to the routingtable.
* If the route already exists, the existing route
* is updated...
*/
int insertRoute(uint32_t group, int ifx) {
struct Config *conf = getCommonConfig();
struct RouteTable* croute;
// Sanitycheck the group adress...
if( ! IN_MULTICAST( ntohl(group) )) {
my_log(LOG_WARNING, 0, "The group address %s is not a valid Multicast group. Table insert failed.",
inetFmt(group, s1));
return 0;
}
// Santiycheck the VIF index...
//if(ifx < 0 || ifx >= MAX_MC_VIFS) {
if(ifx >= MAX_MC_VIFS) {
my_log(LOG_WARNING, 0, "The VIF Ix %d is out of range (0-%d). Table insert failed.",ifx,MAX_MC_VIFS);
return 0;
}
// Try to find an existing route for this group...
croute = findRoute(group);
if(croute==NULL) {
struct RouteTable* newroute;
my_log(LOG_DEBUG, 0, "No existing route for %s. Create new.",
inetFmt(group, s1));
// Create and initialize the new route table entry..
newroute = (struct RouteTable*)malloc(sizeof(struct RouteTable));
// Insert the route desc and clear all pointers...
newroute->group = group;
memset(newroute->originAddrs, 0, MAX_ORIGINS * sizeof(newroute->originAddrs[0]));
newroute->nextroute = NULL;
newroute->prevroute = NULL;
newroute->upstrVif = -1;
// The group is not joined initially.
newroute->upstrState = ROUTESTATE_NOTJOINED;
// The route is not active yet, so the age is unimportant.
newroute->ageValue = conf->robustnessValue;
newroute->ageActivity = 0;
BIT_ZERO(newroute->ageVifBits); // Initially we assume no listeners.
// Set the listener flag...
BIT_ZERO(newroute->vifBits); // Initially no listeners...
if(ifx >= 0) {
BIT_SET(newroute->vifBits, ifx);
}
// Check if there is a table already....
if(routing_table == NULL) {
// No location set, so insert in on the table top.
routing_table = newroute;
my_log(LOG_DEBUG, 0, "No routes in table. Insert at beginning.");
} else {
my_log(LOG_DEBUG, 0, "Found existing routes. Find insert location.");
// Check if the route could be inserted at the beginning...
if(routing_table->group > group) {
my_log(LOG_DEBUG, 0, "Inserting at beginning, before route %s",inetFmt(routing_table->group,s1));
// Insert at beginning...
newroute->nextroute = routing_table;
newroute->prevroute = NULL;
routing_table = newroute;
// If the route has a next node, the previous pointer must be updated.
if(newroute->nextroute != NULL) {
newroute->nextroute->prevroute = newroute;
}
} else {
// Find the location which is closest to the route.
for( croute = routing_table; croute->nextroute != NULL; croute = croute->nextroute ) {
// Find insert position.
if(croute->nextroute->group > group) {
break;
}
}
my_log(LOG_DEBUG, 0, "Inserting after route %s",inetFmt(croute->group,s1));
// Insert after current...
newroute->nextroute = croute->nextroute;
newroute->prevroute = croute;
if(croute->nextroute != NULL) {
croute->nextroute->prevroute = newroute;
}
croute->nextroute = newroute;
}
}
// Set the new route as the current...
croute = newroute;
// Log the cleanup in debugmode...
my_log(LOG_INFO, 0, "Inserted route table entry for %s on VIF #%d",
inetFmt(croute->group, s1),ifx);
} else if(ifx >= 0) {
// The route exists already, so just update it.
BIT_SET(croute->vifBits, ifx);
// Register the VIF activity for the aging routine
BIT_SET(croute->ageVifBits, ifx);
// Log the cleanup in debugmode...
my_log(LOG_INFO, 0, "Updated route entry for %s on VIF #%d",
inetFmt(croute->group, s1), ifx);
// Update route in kernel...
if(!internUpdateKernelRoute(croute, 1)) {
my_log(LOG_WARNING, 0, "The insertion into Kernel failed.");
return 0;
}
}
// Send join message upstream, if the route has no joined flag...
if(croute->upstrState != ROUTESTATE_JOINED) {
// Send Join request upstream
struct IfDesc* downstrIf;
downstrIf = getIfByIx(ifx);
sendJoinLeaveUpstream(croute, 1);
}
logRouteTable("Insert Route");
return 1;
}