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bpf: Add multi uprobe link

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Adding new multi uprobe link that allows to attach bpf program
to multiple uprobes.

Uprobes to attach are specified via new link_create uprobe_multi
union:

  struct {
    __aligned_u64   path;
    __aligned_u64   offsets;
    __aligned_u64   ref_ctr_offsets;
    __u32           cnt;
    __u32           flags;
  } uprobe_multi;

Uprobes are defined for single binary specified in path and multiple
calling sites specified in offsets array with optional reference
counters specified in ref_ctr_offsets array. All specified arrays
have length of 'cnt'.

The 'flags' supports single bit for now that marks the uprobe as
return probe.

Acked-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Yafang Shao <laoar.shao@gmail.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20230809083440.3209381-4-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Jiri Olsa
2023-08-09 10:34:15 +02:00
committed by Andrii Nakryiko
parent 8765ef8276
commit ba4a10d764
1 changed files with 16 additions and 0 deletions
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16
include/uapi/linux/bpf.h
View File

@@ -1039,6 +1039,7 @@ enum bpf_attach_type {
BPF_NETFILTER, BPF_NETFILTER,
BPF_TCX_INGRESS, BPF_TCX_INGRESS,
BPF_TCX_EGRESS, BPF_TCX_EGRESS,
BPF_TRACE_UPROBE_MULTI,
__MAX_BPF_ATTACH_TYPE __MAX_BPF_ATTACH_TYPE
}; };
@@ -1057,6 +1058,7 @@ enum bpf_link_type {
BPF_LINK_TYPE_STRUCT_OPS = 9, BPF_LINK_TYPE_STRUCT_OPS = 9,
BPF_LINK_TYPE_NETFILTER = 10, BPF_LINK_TYPE_NETFILTER = 10,
BPF_LINK_TYPE_TCX = 11, BPF_LINK_TYPE_TCX = 11,
BPF_LINK_TYPE_UPROBE_MULTI = 12,
MAX_BPF_LINK_TYPE, MAX_BPF_LINK_TYPE,
}; };
@@ -1190,6 +1192,13 @@ enum {
BPF_F_KPROBE_MULTI_RETURN = (1U << 0) BPF_F_KPROBE_MULTI_RETURN = (1U << 0)
}; };
/* link_create.uprobe_multi.flags used in LINK_CREATE command for
* BPF_TRACE_UPROBE_MULTI attach type to create return probe.
*/
enum {
BPF_F_UPROBE_MULTI_RETURN = (1U << 0)
};
/* link_create.netfilter.flags used in LINK_CREATE command for /* link_create.netfilter.flags used in LINK_CREATE command for
* BPF_PROG_TYPE_NETFILTER to enable IP packet defragmentation. * BPF_PROG_TYPE_NETFILTER to enable IP packet defragmentation.
*/ */
@@ -1626,6 +1635,13 @@ union bpf_attr {
}; };
__u64 expected_revision; __u64 expected_revision;
} tcx; } tcx;
struct {
__aligned_u64 path;
__aligned_u64 offsets;
__aligned_u64 ref_ctr_offsets;
__u32 cnt;
__u32 flags;
} uprobe_multi;
}; };
} link_create; } link_create;