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bpf: Adding helper function bpf_getsockops

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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>
This commit is contained in:
Lawrence Brakmo
2017-10-20 11:05:40 -07:00
committed by David S. Miller
parent e6546ef6d8
commit cd86d1fd21
3 changed files with 63 additions and 5 deletions
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19
include/uapi/linux/bpf.h
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@@ -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