On 8/26/20 3:19 PM, Hangbin Liu wrote:
[...]
+BPF_CALL_3(bpf_xdp_redirect_map_multi, struct bpf_map *, map,
+ struct bpf_map *, ex_map, u64, flags)
+{
+ struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
+
+ /* Limit ex_map type to DEVMAP_HASH to get better performance */
+ if (unlikely(!map ||
Why is test on !map needed when arg1_type is ARG_CONST_MAP_PTR? Verifier must
guarantee that it's a valid map ptr .. are you saying this is not the case for
this helper?
+ (ex_map && ex_map->map_type != BPF_MAP_TYPE_DEVMAP_HASH) ||
+ flags & ~BPF_F_EXCLUDE_INGRESS))
+ return XDP_ABORTED;
+
+ ri->tgt_index = 0;
+ /* Set the tgt_value to NULL to distinguish with bpf_xdp_redirect_map */
+ ri->tgt_value = NULL;
+ ri->flags = flags;
+ ri->ex_map = ex_map;
+
+ WRITE_ONCE(ri->map, map);
+
+ return XDP_REDIRECT;
+}
+
+static const struct bpf_func_proto bpf_xdp_redirect_map_multi_proto = {
+ .func = bpf_xdp_redirect_map_multi,
+ .gpl_only = false,
+ .ret_type = RET_INTEGER,
+ .arg1_type = ARG_CONST_MAP_PTR,
+ .arg2_type = ARG_CONST_MAP_PTR_OR_NULL,
+ .arg3_type = ARG_ANYTHING,
+};
+
static unsigned long bpf_skb_copy(void *dst_buff, const void *skb,
unsigned long off, unsigned long len)
{
@@ -6833,6 +6933,8 @@ xdp_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
return &bpf_xdp_redirect_proto;
case BPF_FUNC_redirect_map:
return &bpf_xdp_redirect_map_proto;
+ case BPF_FUNC_redirect_map_multi:
+ return &bpf_xdp_redirect_map_multi_proto;
case BPF_FUNC_xdp_adjust_tail:
return &bpf_xdp_adjust_tail_proto;
case BPF_FUNC_fib_lookup:
