Beispiel #1
0
// Get takes a key and returns the value or nil, and an 'ok' style indicator
func (table *BpfTable) Get(keyX interface{}) (interface{}, bool) {
	mod := table.module.p
	fd := C.bpf_table_fd_id(mod, table.id)
	leaf_size := C.bpf_table_leaf_size_id(mod, table.id)
	key, err := table.keyToBytes(keyX)
	if err != nil {
		return nil, false
	}
	leaf := make([]byte, leaf_size)
	keyP := unsafe.Pointer(&key[0])
	leafP := unsafe.Pointer(&leaf[0])
	r := C.bpf_lookup_elem(fd, keyP, leafP)
	if r != 0 {
		return nil, false
	}
	leafStr := make([]byte, leaf_size*8)
	leafStrP := (*C.char)(unsafe.Pointer(&leafStr[0]))
	r = C.bpf_table_leaf_snprintf(mod, table.id, leafStrP, C.size_t(len(leafStr)), leafP)
	if r != 0 {
		return nil, false
	}
	return AdapterTablePair{
		Key:   keyX,
		Value: string(leafStr[:bytes.IndexByte(leafStr, 0)]),
	}, true
	return nil, false
}
Beispiel #2
0
func (table *BpfTable) leafToString(leaf []byte) string {
	leaf_size := C.bpf_table_leaf_size_id(table.module.p, table.id)
	leafP := unsafe.Pointer(&leaf[0])
	leafStr := make([]byte, leaf_size*8)
	leafStrP := (*C.char)(unsafe.Pointer(&leafStr[0]))
	r := C.bpf_table_leaf_snprintf(table.module.p, table.id, leafStrP, C.size_t(len(leafStr)), leafP)
	if r == 0 {
		return string(leafStr)
	}
	return ""
}
Beispiel #3
0
func (table *BpfTable) Iter() <-chan AdapterTablePair {
	mod := table.module.p
	ch := make(chan AdapterTablePair, 128)
	go func() {
		defer close(ch)
		fd := C.bpf_table_fd_id(mod, table.id)
		key_size := C.bpf_table_key_size_id(mod, table.id)
		leaf_size := C.bpf_table_leaf_size_id(mod, table.id)
		key := make([]byte, key_size)
		leaf := make([]byte, leaf_size)
		keyP := unsafe.Pointer(&key[0])
		leafP := unsafe.Pointer(&leaf[0])
		alternateKeys := []byte{0xff, 0x55}
		res := C.bpf_lookup_elem(fd, keyP, leafP)
		// make sure the start iterator is an invalid key
		for i := 0; i <= len(alternateKeys); i++ {
			if res < 0 {
				break
			}
			for j := range key {
				key[j] = alternateKeys[i]
			}
			res = C.bpf_lookup_elem(fd, keyP, leafP)
		}
		if res == 0 {
			Info.Println("BpfTable.Iter: No valid initial key found")
			return
		}
		keyStr := make([]byte, key_size*8)
		leafStr := make([]byte, leaf_size*8)
		keyStrP := (*C.char)(unsafe.Pointer(&keyStr[0]))
		leafStrP := (*C.char)(unsafe.Pointer(&leafStr[0]))
		for res = C.bpf_get_next_key(fd, keyP, keyP); res == 0; res = C.bpf_get_next_key(fd, keyP, keyP) {
			r := C.bpf_lookup_elem(fd, keyP, leafP)
			if r != 0 {
				continue
			}
			r = C.bpf_table_key_snprintf(mod, table.id, keyStrP, C.size_t(len(keyStr)), keyP)
			if r != 0 {
				break
			}
			r = C.bpf_table_leaf_snprintf(mod, table.id, leafStrP, C.size_t(len(leafStr)), leafP)
			if r != 0 {
				break
			}
			ch <- AdapterTablePair{
				Key:   string(keyStr[:bytes.IndexByte(keyStr, 0)]),
				Value: string(leafStr[:bytes.IndexByte(leafStr, 0)]),
			}
		}
	}()
	return ch
}