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[bpf-next,v6,1/2] bpf: enable generic kfuncs for BPF_CGROUP_* programs

Message ID 20240819162805.78235-2-technoboy85@gmail.com (mailing list archive)
State Accepted
Commit 67666479edf1e2b732f4d0ac797885e859a78de4
Delegated to: BPF
Headers show
Series bpf: enable some functions in cgroup programs | expand

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Commit Message

Matteo Croce Aug. 19, 2024, 4:28 p.m. UTC 
From: Matteo Croce <teknoraver@meta.com>

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>
---
 kernel/bpf/btf.c     | 8 ++++++--
 kernel/bpf/helpers.c | 1 +
 2 files changed, 7 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index bfb0d89ccc8b..b12db397303e 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -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:
diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c
index d02ae323996b..26b9649ab4ce 100644
--- a/kernel/bpf/helpers.c
+++ b/kernel/bpf/helpers.c
@@ -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);