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| author | Daniel Borkmann <daniel@iogearbox.net> | 2015-11-19 11:56:22 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-11-20 11:04:15 -0500 |
| commit | f99bf205dab026ef434520198af2fcb7dae0efdb (patch) | |
| tree | 8cb3f0004875ebb38f404b1297bcc79e2ba6400e | |
| parent | 7b5dc0dd59a8e5cf837c941ab10a565dcca76603 (diff) | |
| download | linux-f99bf205dab026ef434520198af2fcb7dae0efdb.tar.gz linux-f99bf205dab026ef434520198af2fcb7dae0efdb.tar.bz2 linux-f99bf205dab026ef434520198af2fcb7dae0efdb.zip | |
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>
| -rw-r--r-- | kernel/bpf/syscall.c | 22 |
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) |