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authorJakub Kicinski <jakub.kicinski@netronome.com>2018-01-17 19:13:28 -0800
committerDaniel Borkmann <daniel@iogearbox.net>2018-01-18 22:54:25 +0100
commit52775b33bb5072fbc07b02c0cf4fe8da1f7ee7cd (patch)
tree86ead032dc8cbdf4488b9719b9ef41e25e8bb189 /kernel
parent7a0ef6939548b9eb74bf464daf55ad68a23602a2 (diff)
downloadop-kernel-dev-52775b33bb5072fbc07b02c0cf4fe8da1f7ee7cd.zip
op-kernel-dev-52775b33bb5072fbc07b02c0cf4fe8da1f7ee7cd.tar.gz
bpf: offload: report device information about offloaded maps
Tell user space about device on which the map was created. Unfortunate reality of user ABI makes sharing this code with program offload difficult but the information is the same. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/bpf/offload.c55
-rw-r--r--kernel/bpf/syscall.c6
2 files changed, 61 insertions, 0 deletions
diff --git a/kernel/bpf/offload.c b/kernel/bpf/offload.c
index 2657976..c940107 100644
--- a/kernel/bpf/offload.c
+++ b/kernel/bpf/offload.c
@@ -413,6 +413,61 @@ int bpf_map_offload_get_next_key(struct bpf_map *map, void *key, void *next_key)
return ret;
}
+struct ns_get_path_bpf_map_args {
+ struct bpf_offloaded_map *offmap;
+ struct bpf_map_info *info;
+};
+
+static struct ns_common *bpf_map_offload_info_fill_ns(void *private_data)
+{
+ struct ns_get_path_bpf_map_args *args = private_data;
+ struct ns_common *ns;
+ struct net *net;
+
+ rtnl_lock();
+ down_read(&bpf_devs_lock);
+
+ if (args->offmap->netdev) {
+ args->info->ifindex = args->offmap->netdev->ifindex;
+ net = dev_net(args->offmap->netdev);
+ get_net(net);
+ ns = &net->ns;
+ } else {
+ args->info->ifindex = 0;
+ ns = NULL;
+ }
+
+ up_read(&bpf_devs_lock);
+ rtnl_unlock();
+
+ return ns;
+}
+
+int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map)
+{
+ struct ns_get_path_bpf_map_args args = {
+ .offmap = map_to_offmap(map),
+ .info = info,
+ };
+ struct inode *ns_inode;
+ struct path ns_path;
+ void *res;
+
+ res = ns_get_path_cb(&ns_path, bpf_map_offload_info_fill_ns, &args);
+ if (IS_ERR(res)) {
+ if (!info->ifindex)
+ return -ENODEV;
+ return PTR_ERR(res);
+ }
+
+ ns_inode = ns_path.dentry->d_inode;
+ info->netns_dev = new_encode_dev(ns_inode->i_sb->s_dev);
+ info->netns_ino = ns_inode->i_ino;
+ path_put(&ns_path);
+
+ return 0;
+}
+
bool bpf_offload_dev_match(struct bpf_prog *prog, struct bpf_map *map)
{
struct bpf_offloaded_map *offmap;
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 97a825f..5bdb0cc 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -1801,6 +1801,12 @@ static int bpf_map_get_info_by_fd(struct bpf_map *map,
info.map_flags = map->map_flags;
memcpy(info.name, map->name, sizeof(map->name));
+ if (bpf_map_is_dev_bound(map)) {
+ err = bpf_map_offload_info_fill(&info, map);
+ if (err)
+ return err;
+ }
+
if (copy_to_user(uinfo, &info, info_len) ||
put_user(info_len, &uattr->info.info_len))
return -EFAULT;
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