bpf: add bpf_redirect_map helper routine
BPF programs can use the devmap with a bpf_redirect_map() helper
routine to forward packets to netdevice in map.
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index b69e7a5..d0d3281 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -379,4 +379,7 @@ extern const struct bpf_func_proto bpf_get_stackid_proto;
void bpf_user_rnd_init_once(void);
u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
+/* Map specifics */
+struct net_device *__dev_map_lookup_elem(struct bpf_map *map, u32 key);
+
#endif /* _LINUX_BPF_H */
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index ecbb0e7..1106a8c 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -348,6 +348,11 @@ union bpf_attr {
* @flags: bit 0 - if set, redirect to ingress instead of egress
* other bits - reserved
* Return: TC_ACT_REDIRECT
+ * int bpf_redirect_map(key, map, flags)
+ * redirect to endpoint in map
+ * @key: index in map to lookup
+ * @map: fd of map to do lookup in
+ * @flags: --
*
* u32 bpf_get_route_realm(skb)
* retrieve a dst's tclassid
@@ -592,7 +597,8 @@ union bpf_attr {
FN(get_socket_uid), \
FN(set_hash), \
FN(setsockopt), \
- FN(skb_adjust_room),
+ FN(skb_adjust_room), \
+ FN(redirect_map),
/* integer value in 'imm' field of BPF_CALL instruction selects which helper
* function eBPF program intends to call