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bpf, xdp: Add bpf_link-based XDP attachment API

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Add bpf_link-based API (bpf_xdp_link) to attach BPF XDP program through
BPF_LINK_CREATE command.

bpf_xdp_link is mutually exclusive with direct BPF program attachment,
previous BPF program should be detached prior to attempting to create a new
bpf_xdp_link attachment (for a given XDP mode). Once BPF link is attached, it
can't be replaced by other BPF program attachment or link attachment. It will
be detached only when the last BPF link FD is closed.

bpf_xdp_link will be auto-detached when net_device is shutdown, similarly to
how other BPF links behave (cgroup, flow_dissector). At that point bpf_link
will become defunct, but won't be destroyed until last FD is closed.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200722064603.3350758-5-andriin@fb.com
This commit is contained in:
Andrii Nakryiko 2020-07-21 23:45:57 -07:00 • committed by Alexei Starovoitov
parent d4baa9368a
commit aa8d3a716b
4 changed files with 178 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

7
include/uapi/linux/bpf.h
View file

@ -230,6 +230,7 @@ enum bpf_attach_type {
BPF_CGROUP_INET_SOCK_RELEASE,
BPF_XDP_CPUMAP,
BPF_SK_LOOKUP,
BPF_XDP,
__MAX_BPF_ATTACH_TYPE
};
@ -242,6 +243,7 @@ enum bpf_link_type {
BPF_LINK_TYPE_CGROUP = 3,
BPF_LINK_TYPE_ITER = 4,
BPF_LINK_TYPE_NETNS = 5,
BPF_LINK_TYPE_XDP = 6,
MAX_BPF_LINK_TYPE,
};
@ -614,7 +616,10 @@ union bpf_attr {
struct { /* struct used by BPF_LINK_CREATE command */
__u32 prog_fd; /* eBPF program to attach */
__u32 target_fd; /* object to attach to */
union {
__u32 target_fd; /* object to attach to */
__u32 target_ifindex; /* target ifindex */
};
__u32 attach_type; /* attach type */
__u32 flags; /* extra flags */
} link_create;