bpf: Adding helper function bpf_getsockops
Adding support for helper function bpf_getsockops to socket_ops BPF
programs. This patch only supports TCP_CONGESTION.
Signed-off-by: Vlad Vysotsky <vlad@cs.ucla.edu>
Acked-by: Lawrence Brakmo <brakmo@fb.com>
Acked-by: Alexei Starovoitov <ast@fb.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 1aca744..f650346 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -613,12 +613,22 @@ union bpf_attr {
* int bpf_setsockopt(bpf_socket, level, optname, optval, optlen)
* Calls setsockopt. Not all opts are available, only those with
* integer optvals plus TCP_CONGESTION.
- * Supported levels: SOL_SOCKET and IPROTO_TCP
+ * Supported levels: SOL_SOCKET and IPPROTO_TCP
* @bpf_socket: pointer to bpf_socket
- * @level: SOL_SOCKET or IPROTO_TCP
+ * @level: SOL_SOCKET or IPPROTO_TCP
* @optname: option name
* @optval: pointer to option value
- * @optlen: length of optval in byes
+ * @optlen: length of optval in bytes
+ * Return: 0 or negative error
+ *
+ * int bpf_getsockopt(bpf_socket, level, optname, optval, optlen)
+ * Calls getsockopt. Not all opts are available.
+ * Supported levels: IPPROTO_TCP
+ * @bpf_socket: pointer to bpf_socket
+ * @level: IPPROTO_TCP
+ * @optname: option name
+ * @optval: pointer to option value
+ * @optlen: length of optval in bytes
* Return: 0 or negative error
*
* int bpf_skb_adjust_room(skb, len_diff, mode, flags)
@@ -721,7 +731,8 @@ union bpf_attr {
FN(sock_map_update), \
FN(xdp_adjust_meta), \
FN(perf_event_read_value), \
- FN(perf_prog_read_value),
+ FN(perf_prog_read_value), \
+ FN(getsockopt),
/* integer value in 'imm' field of BPF_CALL instruction selects which helper
* function eBPF program intends to call