summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorYonghong Song <yhs@fb.com>2020-05-09 20:58:59 +0300
committerAlexei Starovoitov <ast@kernel.org>2020-05-10 03:05:25 +0300
commitae24345da54e452880808b011fa2d8a0bbd191ba (patch)
tree7164a9f76d2fdb61070e81525fb2a628c2dab71e
parent8086fbaf49345f988deec539ec8e182b02914401 (diff)
downloadlinux-ae24345da54e452880808b011fa2d8a0bbd191ba.tar.xz
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
-rw-r--r--include/linux/bpf.h15
-rw-r--r--kernel/bpf/Makefile2
-rw-r--r--kernel/bpf/bpf_iter.c59
3 files changed, 75 insertions, 1 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,
diff --git a/kernel/bpf/Makefile b/kernel/bpf/Makefile
index f2d7be596966..6a8b0febd3f6 100644
--- a/kernel/bpf/Makefile
+++ b/kernel/bpf/Makefile
@@ -2,7 +2,7 @@
obj-y := core.o
CFLAGS_core.o += $(call cc-disable-warning, override-init)
-obj-$(CONFIG_BPF_SYSCALL) += syscall.o verifier.o inode.o helpers.o tnum.o
+obj-$(CONFIG_BPF_SYSCALL) += syscall.o verifier.o inode.o helpers.o tnum.o bpf_iter.o
obj-$(CONFIG_BPF_SYSCALL) += hashtab.o arraymap.o percpu_freelist.o bpf_lru_list.o lpm_trie.o map_in_map.o
obj-$(CONFIG_BPF_SYSCALL) += local_storage.o queue_stack_maps.o
obj-$(CONFIG_BPF_SYSCALL) += disasm.o
diff --git a/kernel/bpf/bpf_iter.c b/kernel/bpf/bpf_iter.c
new file mode 100644
index 000000000000..5a8119d17d14
--- /dev/null
+++ b/kernel/bpf/bpf_iter.c
@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (c) 2020 Facebook */
+
+#include <linux/fs.h>
+#include <linux/filter.h>
+#include <linux/bpf.h>
+
+struct bpf_iter_target_info {
+ struct list_head list;
+ 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;
+};
+
+static struct list_head targets = LIST_HEAD_INIT(targets);
+static DEFINE_MUTEX(targets_mutex);
+
+int bpf_iter_reg_target(struct bpf_iter_reg *reg_info)
+{
+ struct bpf_iter_target_info *tinfo;
+
+ tinfo = kmalloc(sizeof(*tinfo), GFP_KERNEL);
+ if (!tinfo)
+ return -ENOMEM;
+
+ tinfo->target = reg_info->target;
+ tinfo->seq_ops = reg_info->seq_ops;
+ tinfo->init_seq_private = reg_info->init_seq_private;
+ tinfo->fini_seq_private = reg_info->fini_seq_private;
+ tinfo->seq_priv_size = reg_info->seq_priv_size;
+ INIT_LIST_HEAD(&tinfo->list);
+
+ mutex_lock(&targets_mutex);
+ list_add(&tinfo->list, &targets);
+ mutex_unlock(&targets_mutex);
+
+ return 0;
+}
+
+void bpf_iter_unreg_target(const char *target)
+{
+ struct bpf_iter_target_info *tinfo;
+ bool found = false;
+
+ mutex_lock(&targets_mutex);
+ list_for_each_entry(tinfo, &targets, list) {
+ if (!strcmp(target, tinfo->target)) {
+ list_del(&tinfo->list);
+ kfree(tinfo);
+ found = true;
+ break;
+ }
+ }
+ mutex_unlock(&targets_mutex);
+
+ WARN_ON(found == false);
+}