func (table *BpfTable) keyToString(key []byte) string {
key_size := C.bpf_table_key_size_id(table.module.p, table.id)
keyP := unsafe.Pointer(&key[0])
keyStr := make([]byte, key_size*8)
keyStrP := (*C.char)(unsafe.Pointer(&keyStr[0]))
r := C.bpf_table_key_snprintf(table.module.p, table.id, keyStrP, C.size_t(len(keyStr)), keyP)
if r == 0 {
return string(keyStr)
}
return ""
}
func (table *BpfTable) Config() map[string]interface{} {
mod := table.module.p
return map[string]interface{}{
"name": C.GoString(C.bpf_table_name(mod, table.id)),
"fd": int(C.bpf_table_fd_id(mod, table.id)),
"key_size": uint64(C.bpf_table_key_size_id(mod, table.id)),
"leaf_size": uint64(C.bpf_table_leaf_size_id(mod, table.id)),
"key_desc": C.GoString(C.bpf_table_key_desc_id(mod, table.id)),
"leaf_desc": C.GoString(C.bpf_table_leaf_desc_id(mod, table.id)),
}
}
func (bpf *BpfModule) TableDesc(id uint64) map[string]interface{} {
i := C.size_t(id)
return map[string]interface{}{
"name": C.GoString(C.bpf_table_name(bpf.p, i)),
"fd": int(C.bpf_table_fd_id(bpf.p, i)),
"key_size": uint64(C.bpf_table_key_size_id(bpf.p, i)),
"leaf_size": uint64(C.bpf_table_leaf_size_id(bpf.p, i)),
"key_desc": C.GoString(C.bpf_table_key_desc_id(bpf.p, i)),
"leaf_desc": C.GoString(C.bpf_table_leaf_desc_id(bpf.p, i)),
}
}
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
}
func (table *BpfTable) keyToBytes(keyStr string) ([]byte, error) {
mod := table.module.p
key_size := C.bpf_table_key_size_id(mod, table.id)
key := make([]byte, key_size)
keyP := unsafe.Pointer(&key[0])
keyCS := C.CString(keyStr)
defer C.free(unsafe.Pointer(keyCS))
r := C.bpf_table_key_sscanf(mod, table.id, keyCS, keyP)
if r != 0 {
//Warn.Printf("key type is \"%s\"\n", C.GoString(C.bpf_table_key_desc_id(mod, table.id)))
return nil, fmt.Errorf("error scanning key (%v) from string", keyStr)
}
return key, nil
}
func (table *BpfTable) keyToBytes(keyX interface{}) ([]byte, error) {
mod := table.module.p
key_size := C.bpf_table_key_size_id(mod, table.id)
keyStr, ok := keyX.(string)
if !ok {
return nil, fmt.Errorf("table key must be a string")
}
key := make([]byte, key_size)
keyP := unsafe.Pointer(&key[0])
keyCS := C.CString(keyStr)
defer C.free(unsafe.Pointer(keyCS))
r := C.bpf_table_key_sscanf(mod, table.id, keyCS, keyP)
if r != 0 {
return nil, fmt.Errorf("error scanning key from string")
}
return key, nil
}
