/*! Creates a permanent local entry for the interface belonging to this protocol.
You need to hold the cache lock when calling this function.
*/
static status_t
arp_update_local(arp_protocol *protocol)
{
ASSERT_LOCKED_MUTEX(&sCacheLock);
net_interface *interface = protocol->interface;
in_addr_t inetAddress;
if (interface->address == NULL) {
// interface has not yet been set
inetAddress = INADDR_ANY;
} else
inetAddress = ((sockaddr_in *)interface->address)->sin_addr.s_addr;
sockaddr_dl address;
address.sdl_len = sizeof(sockaddr_dl);
address.sdl_family = AF_LINK;
address.sdl_type = IFT_ETHER;
address.sdl_e_type = ETHER_TYPE_IP;
address.sdl_nlen = 0;
address.sdl_slen = 0;
address.sdl_alen = interface->device->address.length;
memcpy(LLADDR(&address), interface->device->address.data, address.sdl_alen);
memcpy(&protocol->hardware_address, &address, sizeof(sockaddr_dl));
// cache the address in our protocol
arp_entry *entry;
status_t status = arp_update_entry(inetAddress, &address,
ARP_FLAG_LOCAL | ARP_FLAG_PERMANENT, &entry);
if (status == B_OK)
entry->protocol = protocol;
return status;
}
// Subtract rectangle from q
void paint_q_sub( rect_t *r )
{
pqel_t *pqel;
ASSERT_LOCKED_MUTEX( &rect_list_lock );
again:
queue_iterate( &rect_list, pqel, pqel_t *, chain )
{
// r includes qe - delete qe
if( rect_includes( r, &pqel->r ) )
{
queue_remove( &rect_list, pqel, pqel_t *, chain );
goto again;
}
// r intersects w qe - divide in two
if( rect_intersects( r, &pqel->r ) )
{
rect_t out1, out2;
rect_sub( &out1, &out2, r, &pqel->r );
if( !rect_empty( &out1 ) )
{
pqel_t *new1 = mkel( &out1 ); if( !new1 ) return;
queue_enter(&rect_list, new1, pqel_t *, chain);
}
static int pipefs_is_dir_empty(struct pipefs_vnode *dir)
{
ASSERT(dir->stream.type == STREAM_TYPE_DIR);
ASSERT_LOCKED_MUTEX(&dir->stream.u.dir.dir_lock);
return !dir->stream.u.dir.dir_head;
}
static void insert_cookie_in_jar(struct pipefs_vnode *dir, struct pipefs_cookie *cookie)
{
ASSERT(dir->stream.type == STREAM_TYPE_DIR);
ASSERT_LOCKED_MUTEX(&dir->stream.u.dir.dir_lock);
cookie->u.dir.next = dir->stream.u.dir.jar_head;
dir->stream.u.dir.jar_head = cookie;
cookie->u.dir.prev = NULL;
}
static int pipefs_insert_in_dir(struct pipefs_vnode *dir, struct pipefs_vnode *v)
{
ASSERT(dir->stream.type == STREAM_TYPE_DIR);
ASSERT_LOCKED_MUTEX(&dir->stream.u.dir.dir_lock);
v->dir_next = dir->stream.u.dir.dir_head;
dir->stream.u.dir.dir_head = v;
v->parent = dir;
return 0;
}
/*! Updates the entry determined by \a protocolAddress with the specified
\a hardwareAddress.
If such an entry does not exist yet, a new entry is added. If you try
to update a local existing entry but didn't ask for it (by setting
\a flags to ARP_FLAG_LOCAL), an error is returned.
This function does not lock the cache - you have to do it yourself
before calling it.
*/
static status_t
arp_update_entry(in_addr_t protocolAddress, sockaddr_dl *hardwareAddress,
uint32 flags, arp_entry **_entry = NULL)
{
ASSERT_LOCKED_MUTEX(&sCacheLock);
TRACE(("%s(%s, %s, flags 0x%" B_PRIx32 ")\n", __FUNCTION__,
inet_to_string(protocolAddress), mac_to_string(LLADDR(hardwareAddress)),
flags));
arp_entry *entry = arp_entry::Lookup(protocolAddress);
if (entry != NULL) {
// We disallow updating of entries that had been resolved before,
// but to a different address (only for those that belong to a
// specific address - redefining INADDR_ANY is always allowed).
// Right now, you have to manually purge the ARP entries (or wait some
// time) to let us switch to the new address.
if (protocolAddress != INADDR_ANY
&& entry->hardware_address.sdl_alen != 0
&& memcmp(LLADDR(&entry->hardware_address),
LLADDR(hardwareAddress), ETHER_ADDRESS_LENGTH)) {
uint8* data = LLADDR(hardwareAddress);
dprintf("ARP host %08x updated with different hardware address "
"%02x:%02x:%02x:%02x:%02x:%02x.\n", protocolAddress,
data[0], data[1], data[2], data[3], data[4], data[5]);
return B_ERROR;
}
entry->hardware_address = *hardwareAddress;
entry->timestamp = system_time();
} else {
entry = arp_entry::Add(protocolAddress, hardwareAddress, flags);
if (entry == NULL)
return B_NO_MEMORY;
}
delete_request_buffer(entry);
if ((entry->flags & ARP_FLAG_PERMANENT) == 0) {
// (re)start the stale timer
entry->timer_state = ARP_STATE_STALE;
sStackModule->set_timer(&entry->timer, ARP_STALE_TIMEOUT);
}
if ((entry->flags & ARP_FLAG_REJECT) != 0)
entry->MarkFailed();
else
entry->MarkValid();
if (_entry)
*_entry = entry;
return B_OK;
}
/*! Scans the domain list for the specified family.
You need to hold the sDomainLock when calling this function.
*/
static net_domain_private*
lookup_domain(int family)
{
ASSERT_LOCKED_MUTEX(&sDomainLock);
DomainList::Iterator iterator = sDomains.GetIterator();
while (net_domain_private* domain = iterator.Next()) {
if (domain->family == family)
return domain;
}
return NULL;
}
slab*
HashedObjectCache::ObjectSlab(void* object) const
{
ASSERT_LOCKED_MUTEX(&lock);
HashedSlab* slab = hash_table.Lookup(::lower_boundary(object, slab_size));
if (slab == NULL) {
panic("hash object cache %p: unknown object %p", this, object);
return NULL;
}
return slab;
}
static void remove_cookie_from_jar(struct pipefs_vnode *dir, struct pipefs_cookie *cookie)
{
ASSERT(dir->stream.type == STREAM_TYPE_DIR);
ASSERT_LOCKED_MUTEX(&dir->stream.u.dir.dir_lock);
if(cookie->u.dir.next)
cookie->u.dir.next->u.dir.prev = cookie->u.dir.prev;
if(cookie->u.dir.prev)
cookie->u.dir.prev->u.dir.next = cookie->u.dir.next;
if(dir->stream.u.dir.jar_head == cookie)
dir->stream.u.dir.jar_head = cookie->u.dir.next;
cookie->u.dir.prev = cookie->u.dir.next = NULL;
}
static struct pipefs_vnode *pipefs_find_in_dir(struct pipefs_vnode *dir, const char *path)
{
struct pipefs_vnode *v;
ASSERT(dir->stream.type == STREAM_TYPE_DIR);
ASSERT_LOCKED_MUTEX(&dir->stream.u.dir.dir_lock);
if(!strcmp(path, "."))
return dir;
if(!strcmp(path, ".."))
return dir->parent;
for(v = dir->stream.u.dir.dir_head; v; v = v->dir_next) {
if(strcmp(v->name, path) == 0) {
return v;
}
}
return NULL;
}
/*static*/ arp_entry *
arp_entry::Add(in_addr_t protocolAddress, sockaddr_dl *hardwareAddress,
uint32 flags)
{
ASSERT_LOCKED_MUTEX(&sCacheLock);
arp_entry *entry = new (std::nothrow) arp_entry;
if (entry == NULL)
return NULL;
entry->protocol_address = protocolAddress;
entry->flags = flags;
entry->timestamp = system_time();
entry->protocol = NULL;
entry->request_buffer = NULL;
entry->timer_state = ARP_NO_STATE;
sStackModule->init_timer(&entry->timer, arp_timer, entry);
if (hardwareAddress != NULL) {
// this entry is already resolved
entry->hardware_address = *hardwareAddress;
entry->hardware_address.sdl_e_type = ETHER_TYPE_IP;
} else {
// this entry still needs to be resolved
entry->hardware_address.sdl_alen = 0;
}
if (entry->hardware_address.sdl_len != sizeof(sockaddr_dl)) {
// explicitly set correct length in case our caller hasn't...
entry->hardware_address.sdl_len = sizeof(sockaddr_dl);
}
if (hash_insert(sCache, entry) != B_OK) {
// We can delete the entry here with the sCacheLock held, since it's
// guaranteed there are no timers pending.
delete entry;
return NULL;
}
return entry;
}
static int pipefs_remove_from_dir(struct pipefs_vnode *dir, struct pipefs_vnode *findit)
{
struct pipefs_vnode *v;
struct pipefs_vnode *last_v;
ASSERT(dir->stream.type == STREAM_TYPE_DIR);
ASSERT_LOCKED_MUTEX(&dir->stream.u.dir.dir_lock);
for(v = dir->stream.u.dir.dir_head, last_v = NULL; v; last_v = v, v = v->dir_next) {
if(v == findit) {
/* make sure all dircookies dont point to this vnode */
update_dircookies(dir, v);
if(last_v)
last_v->dir_next = v->dir_next;
else
dir->stream.u.dir.dir_head = v->dir_next;
v->dir_next = NULL;
return 0;
}
}
return -1;
}
/*! Address resolver function: prepares and triggers the ARP request necessary
to retrieve the hardware address for \a address.
You need to have the sCacheLock held when calling this function.
*/
static status_t
arp_start_resolve(net_datalink_protocol *protocol, in_addr_t address,
arp_entry **_entry)
{
ASSERT_LOCKED_MUTEX(&sCacheLock);
// create an unresolved ARP entry as a placeholder
arp_entry *entry = arp_entry::Add(address, NULL, 0);
if (entry == NULL)
return B_NO_MEMORY;
// prepare ARP request
entry->request_buffer = gBufferModule->create(256);
if (entry->request_buffer == NULL) {
entry->ScheduleRemoval();
return B_NO_MEMORY;
}
NetBufferPrepend<arp_header> bufferHeader(entry->request_buffer);
status_t status = bufferHeader.Status();
if (status < B_OK) {
entry->ScheduleRemoval();
return status;
}
// prepare ARP header
net_device *device = protocol->interface->device;
arp_header &header = bufferHeader.Data();
header.hardware_type = htons(ARP_HARDWARE_TYPE_ETHER);
header.protocol_type = htons(ETHER_TYPE_IP);
header.hardware_length = ETHER_ADDRESS_LENGTH;
header.protocol_length = sizeof(in_addr_t);
header.opcode = htons(ARP_OPCODE_REQUEST);
memcpy(header.hardware_sender, device->address.data, ETHER_ADDRESS_LENGTH);
if (protocol->interface->address != NULL) {
header.protocol_sender
= ((sockaddr_in *)protocol->interface->address)->sin_addr.s_addr;
} else {
header.protocol_sender = 0;
// TODO: test if this actually works - maybe we should use
// INADDR_BROADCAST instead
}
memset(header.hardware_target, 0, ETHER_ADDRESS_LENGTH);
header.protocol_target = address;
// prepare source and target addresses
struct sockaddr_dl &source = *(struct sockaddr_dl *)
entry->request_buffer->source;
source.sdl_len = sizeof(sockaddr_dl);
source.sdl_family = AF_LINK;
source.sdl_index = device->index;
source.sdl_type = IFT_ETHER;
source.sdl_e_type = ETHER_TYPE_ARP;
source.sdl_nlen = source.sdl_slen = 0;
source.sdl_alen = ETHER_ADDRESS_LENGTH;
memcpy(source.sdl_data, device->address.data, ETHER_ADDRESS_LENGTH);
entry->request_buffer->flags = MSG_BCAST;
// this is a broadcast packet, we don't need to fill in the destination
entry->protocol = protocol;
entry->timer_state = ARP_STATE_REQUEST;
sStackModule->set_timer(&entry->timer, 0);
// start request timer
*_entry = entry;
return B_OK;
}
