// 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
}
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 ""
}
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
}