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bpf: Enable generic kfuncs for BPF_CGROUP_* programs

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These kfuncs are enabled even in BPF_PROG_TYPE_TRACING, so they
should be safe also in BPF_CGROUP_* programs.
Since all BPF_CGROUP_* programs share the same hook,
call register_btf_kfunc_id_set() only once.

In enum btf_kfunc_hook, rename BTF_KFUNC_HOOK_CGROUP_SKB to a more
generic BTF_KFUNC_HOOK_CGROUP, since it's used for all the cgroup
related program types.

Signed-off-by: Matteo Croce <teknoraver@meta.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20240819162805.78235-2-technoboy85@gmail.com
This commit is contained in:
Matteo Croce 2024-08-19 18:28:04 +02:00 committed by Andrii Nakryiko
parent fdf1c728fa
commit 67666479ed
2 changed files with 7 additions and 2 deletions
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8
kernel/bpf/btf.c
View File

@ -212,7 +212,7 @@ enum btf_kfunc_hook {
BTF_KFUNC_HOOK_TRACING,
BTF_KFUNC_HOOK_SYSCALL,
BTF_KFUNC_HOOK_FMODRET,
BTF_KFUNC_HOOK_CGROUP_SKB,
BTF_KFUNC_HOOK_CGROUP,
BTF_KFUNC_HOOK_SCHED_ACT,
BTF_KFUNC_HOOK_SK_SKB,
BTF_KFUNC_HOOK_SOCKET_FILTER,
@ -8307,8 +8307,12 @@ static int bpf_prog_type_to_kfunc_hook(enum bpf_prog_type prog_type)
case BPF_PROG_TYPE_SYSCALL:
return BTF_KFUNC_HOOK_SYSCALL;
case BPF_PROG_TYPE_CGROUP_SKB:
case BPF_PROG_TYPE_CGROUP_SOCK:
case BPF_PROG_TYPE_CGROUP_DEVICE:
case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
return BTF_KFUNC_HOOK_CGROUP_SKB;
case BPF_PROG_TYPE_CGROUP_SOCKOPT:
case BPF_PROG_TYPE_CGROUP_SYSCTL:
return BTF_KFUNC_HOOK_CGROUP;
case BPF_PROG_TYPE_SCHED_ACT:
return BTF_KFUNC_HOOK_SCHED_ACT;
case BPF_PROG_TYPE_SK_SKB:

1
kernel/bpf/helpers.c
View File

@ -3052,6 +3052,7 @@ static int __init kfunc_init(void)
ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_XDP, &generic_kfunc_set);
ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS, &generic_kfunc_set);
ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL, &generic_kfunc_set);
ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_CGROUP_SKB, &generic_kfunc_set);
ret = ret ?: register_btf_id_dtor_kfuncs(generic_dtors,
ARRAY_SIZE(generic_dtors),
THIS_MODULE);