Signed-off-by: Hannes Frederic Sowa <han...@stressinduktion.org>
---
kernel/bpf/core.c | 90 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 90 insertions(+)
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index 048e2d79718a16..3ba175a24e971a 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -32,6 +32,9 @@
#include <linux/kallsyms.h>
#include <linux/rcupdate.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+
#include <asm/unaligned.h>
/* Registers */
@@ -488,6 +491,93 @@ int bpf_get_kallsym(unsigned int symnum, unsigned long
*value, char *type,
return ret;
}
+/* ebpf procfs implementation */
+
+static struct proc_dir_entry *ebpf_proc_dir;
+
+static void *ebpf_proc_start(struct seq_file *s, loff_t *pos)
+ __acquires(RCU_BH)
+{
+ struct bpf_prog_aux *aux;
+ loff_t off = 0;
+
+ rcu_read_lock();
+
+ if (*pos == 0)
+ return SEQ_START_TOKEN;
+
+ list_for_each_entry_rcu(aux, &bpf_progs, bpf_progs_head)
+ if (++off == *pos)
+ return aux;
+
+ return NULL;
+}
+
+static void *ebpf_proc_next(struct seq_file *s, void *v, loff_t *pos)
+{
+ struct bpf_prog_aux *aux;
+
+ ++*pos;
+
+ if (v == SEQ_START_TOKEN)
+ return list_first_or_null_rcu(&bpf_progs, struct bpf_prog_aux,
+ bpf_progs_head);
+
+ aux = v;
+ return list_next_or_null_rcu(&bpf_progs,
+ &aux->bpf_progs_head,
+ struct bpf_prog_aux,
+ bpf_progs_head);
+}
+
+static void ebpf_proc_stop(struct seq_file *s, void *v)
+ __releases(RCU_BH)
+{
+ rcu_read_unlock();
+}
+
+static int ebpf_proc_show(struct seq_file *s, void *v)
+{
+ if (v == SEQ_START_TOKEN) {
+ seq_printf(s, "# tag\n");
+ return 0;
+ }
+
+ return 0;
+}
+
+static const struct seq_operations ebpf_seq_ops = {
+ .start = ebpf_proc_start,
+ .next = ebpf_proc_next,
+ .stop = ebpf_proc_stop,
+ .show = ebpf_proc_show,
+};
+
+static int ebpf_proc_open(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &ebpf_seq_ops);
+}
+
+static const struct file_operations ebpf_proc_operations = {
+ .open = ebpf_proc_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
+static int __init ebpf_proc_init(void)
+{
+ ebpf_proc_dir = proc_mkdir("bpf", NULL);
+ if (!ebpf_proc_dir)
+ return 0;
+ proc_create("programs", 0400, ebpf_proc_dir, &ebpf_proc_operations);
+ return 0;
+}
+
+device_initcall(ebpf_proc_init);
+
+/* end of bpf proc inmplementation */
+
struct bpf_binary_header *
bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr,
unsigned int alignment,
--
2.9.3
