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authorYonghong Song <yhs@fb.com>2020-05-09 10:58:59 -0700
committerAlexei Starovoitov <ast@kernel.org>2020-05-09 17:05:25 -0700
commitae24345da54e452880808b011fa2d8a0bbd191ba (patch)
tree7164a9f76d2fdb61070e81525fb2a628c2dab71e /include
parent8086fbaf49345f988deec539ec8e182b02914401 (diff)
bpf: Implement an interface to register bpf_iter targets
The target can call bpf_iter_reg_target() to register itself. The needed information: target: target name seq_ops: the seq_file operations for the target init_seq_private target callback to initialize seq_priv during file open fini_seq_private target callback to clean up seq_priv during file release seq_priv_size: the private_data size needed by the seq_file operations The target name represents a target which provides a seq_ops for iterating objects. The target can provide two callback functions, init_seq_private and fini_seq_private, called during file open/release time. For example, /proc/net/{tcp6, ipv6_route, netlink, ...}, net name space needs to be setup properly during file open and released properly during file release. Function bpf_iter_unreg_target() is also implemented to unregister a particular target. Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andriin@fb.com> Link: https://lore.kernel.org/bpf/20200509175859.2474669-1-yhs@fb.com
Diffstat (limited to 'include')
-rw-r--r--include/linux/bpf.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 1262ec460ab3..40c78b86fe38 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -31,6 +31,7 @@ struct seq_file;
struct btf;
struct btf_type;
struct exception_table_entry;
+struct seq_operations;
extern struct idr btf_idr;
extern spinlock_t btf_idr_lock;
@@ -1126,6 +1127,20 @@ struct bpf_link *bpf_link_get_from_fd(u32 ufd);
int bpf_obj_pin_user(u32 ufd, const char __user *pathname);
int bpf_obj_get_user(const char __user *pathname, int flags);
+typedef int (*bpf_iter_init_seq_priv_t)(void *private_data);
+typedef void (*bpf_iter_fini_seq_priv_t)(void *private_data);
+
+struct bpf_iter_reg {
+ const char *target;
+ const struct seq_operations *seq_ops;
+ bpf_iter_init_seq_priv_t init_seq_private;
+ bpf_iter_fini_seq_priv_t fini_seq_private;
+ u32 seq_priv_size;
+};
+
+int bpf_iter_reg_target(struct bpf_iter_reg *reg_info);
+void bpf_iter_unreg_target(const char *target);
+
int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value);
int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value);
int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,