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authorJakub Kicinski <jakub.kicinski@netronome.com>2017-12-28 05:39:09 +0300
committerDaniel Borkmann <daniel@iogearbox.net>2017-12-31 18:12:23 +0300
commit675fc275a3a2d905535207237402c6d8dcb5fa4b (patch)
treeb1c1ae477626ab0a2695249713b5a5941f25042f /kernel/bpf/offload.c
parentcdab6ba8668d68f031bfd5d237b4586ec4f8cd88 (diff)
downloadlinux-675fc275a3a2d905535207237402c6d8dcb5fa4b.tar.xz
bpf: offload: report device information for offloaded programs
Report to the user ifindex and namespace information of offloaded programs. If device has disappeared return -ENODEV. Specify the namespace using dev/inode combination. CC: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'kernel/bpf/offload.c')
-rw-r--r--kernel/bpf/offload.c59
1 files changed, 59 insertions, 0 deletions
diff --git a/kernel/bpf/offload.c b/kernel/bpf/offload.c
index e4f1668a021c..040d4e0edf3f 100644
--- a/kernel/bpf/offload.c
+++ b/kernel/bpf/offload.c
@@ -16,9 +16,11 @@
#include <linux/bpf.h>
#include <linux/bpf_verifier.h>
#include <linux/bug.h>
+#include <linux/kdev_t.h>
#include <linux/list.h>
#include <linux/netdevice.h>
#include <linux/printk.h>
+#include <linux/proc_ns.h>
#include <linux/rtnetlink.h>
#include <linux/rwsem.h>
@@ -176,6 +178,63 @@ int bpf_prog_offload_compile(struct bpf_prog *prog)
return bpf_prog_offload_translate(prog);
}
+struct ns_get_path_bpf_prog_args {
+ struct bpf_prog *prog;
+ struct bpf_prog_info *info;
+};
+
+static struct ns_common *bpf_prog_offload_info_fill_ns(void *private_data)
+{
+ struct ns_get_path_bpf_prog_args *args = private_data;
+ struct bpf_prog_aux *aux = args->prog->aux;
+ struct ns_common *ns;
+ struct net *net;
+
+ rtnl_lock();
+ down_read(&bpf_devs_lock);
+
+ if (aux->offload) {
+ args->info->ifindex = aux->offload->netdev->ifindex;
+ net = dev_net(aux->offload->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_prog_offload_info_fill(struct bpf_prog_info *info,
+ struct bpf_prog *prog)
+{
+ struct ns_get_path_bpf_prog_args args = {
+ .prog = prog,
+ .info = info,
+ };
+ struct inode *ns_inode;
+ struct path ns_path;
+ void *res;
+
+ res = ns_get_path_cb(&ns_path, bpf_prog_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;
+}
+
const struct bpf_prog_ops bpf_offload_prog_ops = {
};