[PATCH v4 bpf-next 6/9] bpf: implement BPF XDP link-specific introspection APIs
From: Andrii Nakryiko <hidden>
Date: 2020-07-22 06:46:35
Also in:
bpf
Subsystem:
bpf [general] (safe dynamic programs and tools), networking [general], the rest · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
Implement XDP link-specific show_fdinfo and link_info to emit ifindex. Signed-off-by: Andrii Nakryiko <redacted> --- include/uapi/linux/bpf.h | 3 +++ net/core/dev.c | 31 +++++++++++++++++++++++++++++++ 2 files changed, 34 insertions(+)
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 1da0c2984e7f..27bd1c8b0041 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h@@ -4062,6 +4062,9 @@ struct bpf_link_info { __u32 netns_ino; __u32 attach_type; } netns; + struct { + __u32 ifindex; + } xdp; }; } __attribute__((aligned(8)));
diff --git a/net/core/dev.c b/net/core/dev.c
index 44264eff7f1c..9859dae7d4dc 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c@@ -8996,6 +8996,35 @@ static void bpf_xdp_link_dealloc(struct bpf_link *link) kfree(xdp_link); } +static void bpf_xdp_link_show_fdinfo(const struct bpf_link *link, + struct seq_file *seq) +{ + struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link); + u32 ifindex = 0; + + rtnl_lock(); + if (xdp_link->dev) + ifindex = xdp_link->dev->ifindex; + rtnl_unlock(); + + seq_printf(seq, "ifindex:\t%u\n", ifindex); +} + +static int bpf_xdp_link_fill_link_info(const struct bpf_link *link, + struct bpf_link_info *info) +{ + struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link); + u32 ifindex = 0; + + rtnl_lock(); + if (xdp_link->dev) + ifindex = xdp_link->dev->ifindex; + rtnl_unlock(); + + info->xdp.ifindex = ifindex; + return 0; +} + static int bpf_xdp_link_update(struct bpf_link *link, struct bpf_prog *new_prog, struct bpf_prog *old_prog) {
@@ -9041,6 +9070,8 @@ static int bpf_xdp_link_update(struct bpf_link *link, struct bpf_prog *new_prog, static const struct bpf_link_ops bpf_xdp_link_lops = { .release = bpf_xdp_link_release, .dealloc = bpf_xdp_link_dealloc, + .show_fdinfo = bpf_xdp_link_show_fdinfo, + .fill_link_info = bpf_xdp_link_fill_link_info, .update_prog = bpf_xdp_link_update, };
--
2.24.1