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authorDaniel Borkmann <daniel@iogearbox.net>2015-11-19 11:56:22 +0100
committerDavid S. Miller <davem@davemloft.net>2015-11-20 11:04:15 -0500
commitf99bf205dab026ef434520198af2fcb7dae0efdb (patch)
tree8cb3f0004875ebb38f404b1297bcc79e2ba6400e /kernel
parent7b5dc0dd59a8e5cf837c941ab10a565dcca76603 (diff)
downloadlinux-f99bf205dab026ef434520198af2fcb7dae0efdb.tar.bz2
bpf: add show_fdinfo handler for maps
Add a handler for show_fdinfo() to be used by the anon-inodes backend for eBPF maps, and dump the map specification there. Not only useful for admins, but also it provides a minimal way to compare specs from ELF vs pinned object. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/bpf/syscall.c22
1 files changed, 21 insertions, 1 deletions
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 0d3313d02a7e..6d1407bc1531 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -93,6 +93,23 @@ void bpf_map_put(struct bpf_map *map)
}
}
+#ifdef CONFIG_PROC_FS
+static void bpf_map_show_fdinfo(struct seq_file *m, struct file *filp)
+{
+ const struct bpf_map *map = filp->private_data;
+
+ seq_printf(m,
+ "map_type:\t%u\n"
+ "key_size:\t%u\n"
+ "value_size:\t%u\n"
+ "max_entries:\t%u\n",
+ map->map_type,
+ map->key_size,
+ map->value_size,
+ map->max_entries);
+}
+#endif
+
static int bpf_map_release(struct inode *inode, struct file *filp)
{
struct bpf_map *map = filp->private_data;
@@ -108,7 +125,10 @@ static int bpf_map_release(struct inode *inode, struct file *filp)
}
static const struct file_operations bpf_map_fops = {
- .release = bpf_map_release,
+#ifdef CONFIG_PROC_FS
+ .show_fdinfo = bpf_map_show_fdinfo,
+#endif
+ .release = bpf_map_release,
};
int bpf_map_new_fd(struct bpf_map *map)