/**
* Handles incoming membership reports, and
* appends them to the routing table.
*/
void acceptGroupReport(uint32_t src, uint32_t group, uint8_t type) {
struct IfDesc *sourceVif;
// Sanitycheck the group adress...
if(!IN_MULTICAST( ntohl(group) )) {
my_log(LOG_WARNING, 0, "The group address %s is not a valid Multicast group.",
inetFmt(group, s1));
return;
}
// Find the interface on which the report was recieved.
sourceVif = getIfByAddress( src );
if(sourceVif == NULL) {
my_log(LOG_WARNING, 0, "No interfaces found for source %s",
inetFmt(src,s1));
return;
}
if(sourceVif->InAdr.s_addr == src) {
my_log(LOG_NOTICE, 0, "The IGMP message was from myself. Ignoring.");
return;
}
// We have a IF so check that it's an downstream IF.
if(sourceVif->state == IF_STATE_DOWNSTREAM) {
my_log(LOG_DEBUG, 0, "Should insert group %s (from: %s) to route table. Vif Ix : %d",
inetFmt(group,s1), inetFmt(src,s2), sourceVif->index);
// If we don't have a whitelist we insertRoute and done
if(sourceVif->allowedgroups == NULL)
{
#ifdef RALINK_ESW_SUPPORT
insert_multicast_ip(ntohl(group), ntohl(src));
#endif
insertRoute(group, sourceVif->index);
return;
}
// Check if this Request is legit on this interface
struct SubnetList *sn;
for(sn = sourceVif->allowedgroups; sn != NULL; sn = sn->next)
if((group & sn->subnet_mask) == sn->subnet_addr)
{
#ifdef RALINK_ESW_SUPPORT
insert_multicast_ip(ntohl(group), ntohl(src));
#endif
// The membership report was OK... Insert it into the route table..
insertRoute(group, sourceVif->index);
return;
}
my_log(LOG_INFO, 0, "The group address %s may not be requested from this interface. Ignoring.", inetFmt(group, s1));
} else {
// Log the state of the interface the report was recieved on.
my_log(LOG_INFO, 0, "Mebership report was recieved on %s. Ignoring.",
sourceVif->state==IF_STATE_UPSTREAM?"the upstream interface":"a disabled interface");
}
}
/**
* Activates a passive group. If the group is already
* activated, it's reinstalled in the kernel. If
* the route is activated, no originAddr is needed.
*/
int activateRoute(uint32_t group, uint32_t originAddr) {
struct RouteTable* croute;
int result = 0;
// Find the requested route.
croute = findRoute(group);
if(croute == NULL) {
my_log(LOG_DEBUG, 0,
"No table entry for %s [From: %s]. Inserting route.",
inetFmt(group, s1),inetFmt(originAddr, s2));
// Insert route, but no interfaces have yet requested it downstream.
insertRoute(group, -1);
// Retrieve the route from table...
croute = findRoute(group);
}
if(croute != NULL) {
// If the origin address is set, update the route data.
if(originAddr > 0) {
// find this origin, or an unused slot
int i;
for (i = 0; i < MAX_ORIGINS; i++) {
// unused slots are at the bottom, so we can't miss this origin
if (croute->originAddrs[i] == originAddr || croute->originAddrs[i] == 0) {
break;
}
}
if (i == MAX_ORIGINS) {
i = MAX_ORIGINS - 1;
my_log(LOG_WARNING, 0, "Too many origins for route %s; replacing %s with %s",
inetFmt(croute->group, s1),
inetFmt(croute->originAddrs[i], s2),
inetFmt(originAddr, s3));
}
// set origin
croute->originAddrs[i] = originAddr;
// move it to the top
while (i > 0) {
uint32_t t = croute->originAddrs[i - 1];
croute->originAddrs[i - 1] = croute->originAddrs[i];
croute->originAddrs[i] = t;
i--;
}
}
// Only update kernel table if there are listeners !
if(croute->vifBits > 0) {
result = internUpdateKernelRoute(croute, 1);
}
}
logRouteTable("Activate Route");
return result;
}
/**
* Handles incoming membership reports, and
* appends them to the routing table.
*/
void acceptGroupReport(uint32_t src, uint32_t group, uint8_t type) {
struct IfDesc *sourceVif;
// Sanitycheck the group adress...
if(!IN_MULTICAST( ntohl(group) )) {
my_log(LOG_WARNING, 0, "The group address %s is not a valid Multicast group.",
inetFmt(group, s1));
return;
}
// Find the interface on which the report was recieved.
sourceVif = getIfByAddress( src );
if(sourceVif == NULL) {
my_log(LOG_WARNING, 0, "No interfaces found for source %s",
inetFmt(src,s1));
return;
}
if(sourceVif->InAdr.s_addr == src) {
my_log(LOG_NOTICE, 0, "The IGMP message was from myself. Ignoring.");
return;
}
// We have a IF so check that it's an downstream IF.
if(sourceVif->state == IF_STATE_DOWNSTREAM) {
my_log(LOG_DEBUG, 0, "Should insert group %s (from: %s) to route table. Vif Ix : %d",
inetFmt(group,s1), inetFmt(src,s2), sourceVif->index);
// The membership report was OK... Insert it into the route table..
insertRoute(group, sourceVif->index);
} else {
// Log the state of the interface the report was recieved on.
my_log(LOG_INFO, 0, "Membership report was recieved on %s. Ignoring.",
sourceVif->state==IF_STATE_UPSTREAM?"the upstream interface":"a disabled interface");
}
}
/**
* Accept a V3 Membership Report
*/
void acceptV3GroupReport(uint32_t src, uint8_t type, struct igmpv3_groupreport* igmpv3rep) {
struct IfDesc *sourceVif;
// Sanitycheck the group adress...
if(!IN_MULTICAST( ntohl(group) )) {
my_log(LOG_WARNING, 0, "The group address %s is not a valid Multicast group.",
inetFmt(group, s1));
return;
}
// Find the interface on which the report was recieved.
sourceVif = getIfByAddress( src );
if(sourceVif == NULL) {
my_log(LOG_WARNING, 0, "No interfaces found for source %s",
inetFmt(src,s1));
return;
}
if(sourceVif->InAdr.s_addr == src) {
my_log(LOG_NOTICE, 0, "The IGMP message was from myself. Ignoring.");
return;
}
// We have a IF so check that it's an downstream IF.
if(sourceVif->state != IF_STATE_DOWNSTREAM) {
// Log the state of the interface the report was recieved on.
my_log(LOG_INFO, 0, "Membership report was recieved on %s. Ignoring.",
sourceVif->state==IF_STATE_UPSTREAM?"the upstream interface":"a disabled interface");
} else {
my_log(LOG_DEBUG, 0, "IGMPv3 Membership Report")
// TODO: Can we batch-report here?
uint16_t num_entries = ntohl(igmpv3rep->num_entries);
uint16_t eix = 0;
while ( eix < num_entries )
{
struct igmpv3_groupreport_entry* e = (struct igmpv3_groupreport_entry* igmpv3rep->grec) + eix;
uint16_t num_sources = ntohl(e->nsrcs);
uint16_t six = 0;
while ( six < num_sources )
{
uint32_t* srcgroup = (uint32_t* e->sources) + six;
group = ntohl(*srcgroup);
switch ( e->type == 0x0 )
{
case IGMPV3_GRE_MODE_INCLUDE:
case IGMPV3_GRE_CHMODE_INCLUDE:
case IGMPV3_GRE_ALLOW_NEW_SOURCES:
my_log(LOG_DEBUG, 0, "IGMPv3 Subscribe to %s.",
inetFmt(group, s1));
insertRoute(group, sourceVif->index);
break;
case IGMPV3_GRE_MODE_EXCLUDE:
case IGMPV3_GRE_CHMODE_EXCLUDE:
case IGMPV3_GRE_BLOCK_OLD_SOURCES:
my_log(LOG_DEBUG, 0, "IGMPv3 Unsubscribe from %s.",
inetFmt(group, s1));
deleteRoute(group, sourceVif->index);
break;
default:
my_log(LOG_INFO, 0, "Membership V3 group report received with unknown type %d.", e->type);
}
};
eix++;
};
return;
}
}
