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1ed4d92458
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
65 lines
1.3 KiB
C
65 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _UAPI__SOCK_DIAG_H__
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#define _UAPI__SOCK_DIAG_H__
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#include <linux/types.h>
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#define SOCK_DIAG_BY_FAMILY 20
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#define SOCK_DESTROY 21
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struct sock_diag_req {
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__u8 sdiag_family;
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__u8 sdiag_protocol;
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};
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enum {
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SK_MEMINFO_RMEM_ALLOC,
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SK_MEMINFO_RCVBUF,
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SK_MEMINFO_WMEM_ALLOC,
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SK_MEMINFO_SNDBUF,
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SK_MEMINFO_FWD_ALLOC,
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SK_MEMINFO_WMEM_QUEUED,
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SK_MEMINFO_OPTMEM,
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SK_MEMINFO_BACKLOG,
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SK_MEMINFO_DROPS,
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SK_MEMINFO_VARS,
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};
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enum sknetlink_groups {
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SKNLGRP_NONE,
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SKNLGRP_INET_TCP_DESTROY,
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SKNLGRP_INET_UDP_DESTROY,
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SKNLGRP_INET6_TCP_DESTROY,
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SKNLGRP_INET6_UDP_DESTROY,
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__SKNLGRP_MAX,
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};
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#define SKNLGRP_MAX (__SKNLGRP_MAX - 1)
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enum {
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SK_DIAG_BPF_STORAGE_REQ_NONE,
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SK_DIAG_BPF_STORAGE_REQ_MAP_FD,
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__SK_DIAG_BPF_STORAGE_REQ_MAX,
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};
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#define SK_DIAG_BPF_STORAGE_REQ_MAX (__SK_DIAG_BPF_STORAGE_REQ_MAX - 1)
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enum {
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SK_DIAG_BPF_STORAGE_REP_NONE,
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SK_DIAG_BPF_STORAGE,
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__SK_DIAG_BPF_STORAGE_REP_MAX,
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};
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#define SK_DIAB_BPF_STORAGE_REP_MAX (__SK_DIAG_BPF_STORAGE_REP_MAX - 1)
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enum {
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SK_DIAG_BPF_STORAGE_NONE,
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SK_DIAG_BPF_STORAGE_PAD,
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SK_DIAG_BPF_STORAGE_MAP_ID,
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SK_DIAG_BPF_STORAGE_MAP_VALUE,
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__SK_DIAG_BPF_STORAGE_MAX,
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};
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#define SK_DIAG_BPF_STORAGE_MAX (__SK_DIAG_BPF_STORAGE_MAX - 1)
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#endif /* _UAPI__SOCK_DIAG_H__ */
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