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bpf: Add basic bpf_rb_{root,node} support

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This patch adds special BPF_RB_{ROOT,NODE} btf_field_types similar to
BPF_LIST_{HEAD,NODE}, adds the necessary plumbing to detect the new
types, and adds bpf_rb_root_free function for freeing bpf_rb_root in
map_values.

structs bpf_rb_root and bpf_rb_node are opaque types meant to
obscure structs rb_root_cached rb_node, respectively.

btf_struct_access will prevent BPF programs from touching these special
fields automatically now that they're recognized.

btf_check_and_fixup_fields now groups list_head and rb_root together as
"graph root" fields and {list,rb}_node as "graph node", and does same
ownership cycle checking as before. Note that this function does _not_
prevent ownership type mixups (e.g. rb_root owning list_node) - that's
handled by btf_parse_graph_root.

After this patch, a bpf program can have a struct bpf_rb_root in a
map_value, but not add anything to nor do anything useful with it.

Signed-off-by: Dave Marchevsky <davemarchevsky@fb.com>
Link: https://lore.kernel.org/r/20230214004017.2534011-2-davemarchevsky@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Dave Marchevsky
2023-02-13 16:40:10 -08:00
committed by Andrii Nakryiko
parent 418962b686
commit d74065659a
1 changed files with 11 additions and 0 deletions
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11
include/uapi/linux/bpf.h
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@@ -6917,6 +6917,17 @@ struct bpf_list_node {
__u64 :64;
} __attribute__((aligned(8)));
struct bpf_rb_root {
__u64 :64;
__u64 :64;
} __attribute__((aligned(8)));
struct bpf_rb_node {
__u64 :64;
__u64 :64;
__u64 :64;
} __attribute__((aligned(8)));
struct bpf_sysctl {
__u32 write; /* Sysctl is being read (= 0) or written (= 1).
* Allows 1,2,4-byte read, but no write.