Re: [PATCH bpf-next v3 1/2] bpf: add skcipher API support to TC/XDP programs

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 11/1/23 3:50 PM, Vadim Fedorenko wrote:
+static void *__bpf_dynptr_data_ptr(const struct bpf_dynptr_kern *ptr)
+{
+    enum bpf_dynptr_type type;
+
+    if (!ptr->data)
+        return NULL;
+
+    type = bpf_dynptr_get_type(ptr);
+
+    switch (type) {
+    case BPF_DYNPTR_TYPE_LOCAL:
+    case BPF_DYNPTR_TYPE_RINGBUF:
+        return ptr->data + ptr->offset;
+    case BPF_DYNPTR_TYPE_SKB:
+        return skb_pointer_if_linear(ptr->data, ptr->offset, __bpf_dynptr_size(ptr));
+    case BPF_DYNPTR_TYPE_XDP:
+    {
+        void *xdp_ptr = bpf_xdp_pointer(ptr->data, ptr->offset, __bpf_dynptr_size(ptr));

I suspect what it is doing here (for skb and xdp in particular) is very similar to bpf_dynptr_slice. Please check if bpf_dynptr_slice(ptr, 0, NULL, sz) will work.


Well, yes, it's simplified version of bpf_dynptr_slice. The problem is
that bpf_dynptr_slice bpf_kfunc which cannot be used in another
bpf_kfunc. Should I refactor the code to use it in both places? Like

Sorry, scrolled too fast in my earlier reply :(

I am not aware of this limitation. What error does it have?
The bpf_dynptr_slice_rdwr kfunc() is also calling the bpf_dynptr_slice() kfunc.

create __bpf_dynptr_slice() which will be internal part of bpf_kfunc?









[Index of Archives]     [Kernel]     [Gnu Classpath]     [Gnu Crypto]     [DM Crypt]     [Netfilter]     [Bugtraq]
  Powered by Linux