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a3fd7ceee0
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
57 lines
1.2 KiB
C
57 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _BPF_NETNS_H
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#define _BPF_NETNS_H
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#include <linux/mutex.h>
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#include <uapi/linux/bpf.h>
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enum netns_bpf_attach_type {
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NETNS_BPF_INVALID = -1,
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NETNS_BPF_FLOW_DISSECTOR = 0,
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MAX_NETNS_BPF_ATTACH_TYPE
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};
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static inline enum netns_bpf_attach_type
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to_netns_bpf_attach_type(enum bpf_attach_type attach_type)
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{
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switch (attach_type) {
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case BPF_FLOW_DISSECTOR:
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return NETNS_BPF_FLOW_DISSECTOR;
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default:
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return NETNS_BPF_INVALID;
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}
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}
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/* Protects updates to netns_bpf */
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extern struct mutex netns_bpf_mutex;
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union bpf_attr;
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struct bpf_prog;
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#ifdef CONFIG_NET
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int netns_bpf_prog_query(const union bpf_attr *attr,
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union bpf_attr __user *uattr);
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int netns_bpf_prog_attach(const union bpf_attr *attr,
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struct bpf_prog *prog);
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int netns_bpf_prog_detach(const union bpf_attr *attr);
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#else
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static inline int netns_bpf_prog_query(const union bpf_attr *attr,
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union bpf_attr __user *uattr)
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{
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return -EOPNOTSUPP;
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}
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static inline int netns_bpf_prog_attach(const union bpf_attr *attr,
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struct bpf_prog *prog)
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{
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return -EOPNOTSUPP;
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}
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static inline int netns_bpf_prog_detach(const union bpf_attr *attr)
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{
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return -EOPNOTSUPP;
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}
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#endif
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#endif /* _BPF_NETNS_H */
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