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This patch adds INET_DIAG support to bpf_sk_storage.
1. Although this series adds bpf_sk_storage diag capability to inet sk,
bpf_sk_storage is in general applicable to all fullsock. Hence, the
bpf_sk_storage logic will operate on SK_DIAG_* nlattr. The caller
will pass in its specific nesting nlattr (e.g. INET_DIAG_*) as
the argument.
2. The request will be like:
INET_DIAG_REQ_SK_BPF_STORAGES (nla_nest) (defined in latter patch)
SK_DIAG_BPF_STORAGE_REQ_MAP_FD (nla_put_u32)
SK_DIAG_BPF_STORAGE_REQ_MAP_FD (nla_put_u32)
......
Considering there could have multiple bpf_sk_storages in a sk,
instead of reusing INET_DIAG_INFO ("ss -i"), the user can select
some specific bpf_sk_storage to dump by specifying an array of
SK_DIAG_BPF_STORAGE_REQ_MAP_FD.
If no SK_DIAG_BPF_STORAGE_REQ_MAP_FD is specified (i.e. an empty
INET_DIAG_REQ_SK_BPF_STORAGES), it will dump all bpf_sk_storages
of a sk.
3. The reply will be like:
INET_DIAG_BPF_SK_STORAGES (nla_nest) (defined in latter patch)
SK_DIAG_BPF_STORAGE (nla_nest)
SK_DIAG_BPF_STORAGE_MAP_ID (nla_put_u32)
SK_DIAG_BPF_STORAGE_MAP_VALUE (nla_reserve_64bit)
SK_DIAG_BPF_STORAGE (nla_nest)
SK_DIAG_BPF_STORAGE_MAP_ID (nla_put_u32)
SK_DIAG_BPF_STORAGE_MAP_VALUE (nla_reserve_64bit)
......
4. Unlike other INET_DIAG info of a sk which is pretty static, the size
required to dump the bpf_sk_storage(s) of a sk is dynamic as the
system adding more bpf_sk_storage_map. It is hard to set a static
min_dump_alloc size.
Hence, this series learns it at the runtime and adjust the
cb->min_dump_alloc as it iterates all sk(s) of a system. The
"unsigned int *res_diag_size" in bpf_sk_storage_diag_put()
is for this purpose.
The next patch will update the cb->min_dump_alloc as it
iterates the sk(s).
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20200225230421.1975729-1-kafai@fb.com
51 lines
1.3 KiB
C
51 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (c) 2019 Facebook */
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#ifndef _BPF_SK_STORAGE_H
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#define _BPF_SK_STORAGE_H
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struct sock;
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void bpf_sk_storage_free(struct sock *sk);
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extern const struct bpf_func_proto bpf_sk_storage_get_proto;
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extern const struct bpf_func_proto bpf_sk_storage_delete_proto;
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struct bpf_sk_storage_diag;
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struct sk_buff;
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struct nlattr;
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struct sock;
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#ifdef CONFIG_BPF_SYSCALL
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int bpf_sk_storage_clone(const struct sock *sk, struct sock *newsk);
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struct bpf_sk_storage_diag *
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bpf_sk_storage_diag_alloc(const struct nlattr *nla_stgs);
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void bpf_sk_storage_diag_free(struct bpf_sk_storage_diag *diag);
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int bpf_sk_storage_diag_put(struct bpf_sk_storage_diag *diag,
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struct sock *sk, struct sk_buff *skb,
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int stg_array_type,
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unsigned int *res_diag_size);
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#else
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static inline int bpf_sk_storage_clone(const struct sock *sk,
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struct sock *newsk)
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{
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return 0;
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}
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static inline struct bpf_sk_storage_diag *
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bpf_sk_storage_diag_alloc(const struct nlattr *nla)
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{
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return NULL;
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}
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static inline void bpf_sk_storage_diag_free(struct bpf_sk_storage_diag *diag)
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{
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}
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static inline int bpf_sk_storage_diag_put(struct bpf_sk_storage_diag *diag,
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struct sock *sk, struct sk_buff *skb,
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int stg_array_type,
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unsigned int *res_diag_size)
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{
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return 0;
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}
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#endif
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#endif /* _BPF_SK_STORAGE_H */
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