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libbpf: Add support for bpf_link-based netns attachment

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Add bpf_program__attach_nets(), which uses LINK_CREATE subcommand to create
an FD-based kernel bpf_link, for attach types tied to network namespace,
that is BPF_FLOW_DISSECTOR for the moment.

Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200531082846.2117903-7-jakub@cloudflare.com
This commit is contained in:
Jakub Sitnicki
2020-05-31 10:28:40 +02:00
committed by Andrii Nakryiko
parent fbdee96fa1
commit 890f25520a
3 changed files with 21 additions and 5 deletions
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src/libbpf.h
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@@ -253,6 +253,8 @@ LIBBPF_API struct bpf_link *
bpf_program__attach_lsm(struct bpf_program *prog);
LIBBPF_API struct bpf_link *
bpf_program__attach_cgroup(struct bpf_program *prog, int cgroup_fd);
LIBBPF_API struct bpf_link *
bpf_program__attach_netns(struct bpf_program *prog, int netns_fd);
struct bpf_map;