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authorJakub Sitnicki <jakub@cloudflare.com>2020-05-31 11:28:36 +0300
committerAlexei Starovoitov <ast@kernel.org>2020-06-02 01:21:02 +0300
commita3fd7ceee05431d2c51ed86c6cae015d236a51f0 (patch)
tree239fb6cb80a26ab38befd59faa7d4354d5eac190 /include/linux/bpf-netns.h
parent171526f6fee84de0c39e2b7aa7e666ba0bbfd173 (diff)
downloadlinux-a3fd7ceee05431d2c51ed86c6cae015d236a51f0.tar.xz
net: Introduce netns_bpf for BPF programs attached to netns
In order to: (1) attach more than one BPF program type to netns, or (2) support attaching BPF programs to netns with bpf_link, or (3) support multi-prog attach points for netns we will need to keep more state per netns than a single pointer like we have now for BPF flow dissector program. Prepare for the above by extracting netns_bpf that is part of struct net, for storing all state related to BPF programs attached to netns. Turn flow dissector callbacks for querying/attaching/detaching a program into generic ones that operate on netns_bpf. Next patch will move the generic callbacks into their own module. This is similar to how it is organized for cgroup with cgroup_bpf. Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Cc: Stanislav Fomichev <sdf@google.com> Link: https://lore.kernel.org/bpf/20200531082846.2117903-3-jakub@cloudflare.com
Diffstat (limited to 'include/linux/bpf-netns.h')
-rw-r--r--include/linux/bpf-netns.h56
1 files changed, 56 insertions, 0 deletions
diff --git a/include/linux/bpf-netns.h b/include/linux/bpf-netns.h
new file mode 100644
index 000000000000..f3aec3d79824
--- /dev/null
+++ b/include/linux/bpf-netns.h
@@ -0,0 +1,56 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _BPF_NETNS_H
+#define _BPF_NETNS_H
+
+#include <linux/mutex.h>
+#include <uapi/linux/bpf.h>
+
+enum netns_bpf_attach_type {
+ NETNS_BPF_INVALID = -1,
+ NETNS_BPF_FLOW_DISSECTOR = 0,
+ MAX_NETNS_BPF_ATTACH_TYPE
+};
+
+static inline enum netns_bpf_attach_type
+to_netns_bpf_attach_type(enum bpf_attach_type attach_type)
+{
+ switch (attach_type) {
+ case BPF_FLOW_DISSECTOR:
+ return NETNS_BPF_FLOW_DISSECTOR;
+ default:
+ return NETNS_BPF_INVALID;
+ }
+}
+
+/* Protects updates to netns_bpf */
+extern struct mutex netns_bpf_mutex;
+
+union bpf_attr;
+struct bpf_prog;
+
+#ifdef CONFIG_NET
+int netns_bpf_prog_query(const union bpf_attr *attr,
+ union bpf_attr __user *uattr);
+int netns_bpf_prog_attach(const union bpf_attr *attr,
+ struct bpf_prog *prog);
+int netns_bpf_prog_detach(const union bpf_attr *attr);
+#else
+static inline int netns_bpf_prog_query(const union bpf_attr *attr,
+ union bpf_attr __user *uattr)
+{
+ return -EOPNOTSUPP;
+}
+
+static inline int netns_bpf_prog_attach(const union bpf_attr *attr,
+ struct bpf_prog *prog)
+{
+ return -EOPNOTSUPP;
+}
+
+static inline int netns_bpf_prog_detach(const union bpf_attr *attr)
+{
+ return -EOPNOTSUPP;
+}
+#endif
+
+#endif /* _BPF_NETNS_H */