Add a BPF_MAP_TYPE_CGROUP_ARRAY and its bpf_map_ops's implementations.
To update an element, the caller is expected to obtain a cgroup2 backed
fd by open(cgroup2_dir) and then update the array with that fd.
Signed-off-by: Martin KaFai Lau <kafai@xxxxxx>
Cc: Alexei Starovoitov <ast@xxxxxx>
Cc: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
---
include/uapi/linux/bpf.h | 1 +
kernel/bpf/arraymap.c | 41 +++++++++++++++++++++++++++++++++++++++++
kernel/bpf/syscall.c | 3 ++-
3 files changed, 44 insertions(+), 1 deletion(-)
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 406459b..ef4e386 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -84,6 +84,7 @@ enum bpf_map_type {
BPF_MAP_TYPE_PERCPU_HASH,
BPF_MAP_TYPE_PERCPU_ARRAY,
BPF_MAP_TYPE_STACK_TRACE,
+ BPF_MAP_TYPE_CGROUP_ARRAY,
};
enum bpf_prog_type {
diff --git a/kernel/bpf/arraymap.c b/kernel/bpf/arraymap.c
index 5af3073..5e279ec 100644
--- a/kernel/bpf/arraymap.c
+++ b/kernel/bpf/arraymap.c
@@ -539,3 +539,44 @@ static int __init register_perf_event_array_map(void)
return 0;
}
late_initcall(register_perf_event_array_map);
+
+static void *cgroup_fd_array_get_ptr(struct bpf_map *map,
+ struct file *map_file /* not used */,
+ int fd)
+{
+ return cgroup_get_from_fd(fd);
+}
+
+static void cgroup_fd_array_put_ptr(void *ptr)
+{
+ /* cgroup_put free cgrp after a rcu grace period */
+ cgroup_put(ptr);
+}
+
+static void cgroup_fd_array_free(struct bpf_map *map)
+{
+ bpf_fd_array_map_clear(map);
+ fd_array_map_free(map);
+}
+
+static const struct bpf_map_ops cgroup_array_ops = {
+ .map_alloc = fd_array_map_alloc,
+ .map_free = cgroup_fd_array_free,
+ .map_get_next_key = array_map_get_next_key,
+ .map_lookup_elem = fd_array_map_lookup_elem,
+ .map_delete_elem = fd_array_map_delete_elem,
+ .map_fd_get_ptr = cgroup_fd_array_get_ptr,
+ .map_fd_put_ptr = cgroup_fd_array_put_ptr,
+};
+
+static struct bpf_map_type_list cgroup_array_type __read_mostly = {
+ .ops = &cgroup_array_ops,
+ .type = BPF_MAP_TYPE_CGROUP_ARRAY,
+};
+
+static int __init register_cgroup_array_map(void)
+{
+ bpf_register_map_type(&cgroup_array_type);
+ return 0;
+}
+late_initcall(register_cgroup_array_map);
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index c23a4e93..cac13f1 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -393,7 +393,8 @@ static int map_update_elem(union bpf_attr *attr)
} else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) {
err = bpf_percpu_array_update(map, key, value, attr->flags);
} else if (map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY ||
- map->map_type == BPF_MAP_TYPE_PROG_ARRAY) {
+ map->map_type == BPF_MAP_TYPE_PROG_ARRAY ||
+ map->map_type == BPF_MAP_TYPE_CGROUP_ARRAY) {
rcu_read_lock();
err = bpf_fd_array_map_update_elem(map, f.file, key, value,
attr->flags);
--
2.5.1
--
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