bpftool: Formatting defined by user:fmt: decl tag #6007
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Certain data types get exceptionally unwieldy when formatted by bpftool,
e.g. IP6 addresses.
Introduce custom formatting in bpftool driven by user:fmt: decl tag.
When a type is tagged user:fmt:ip, the value is formatted as IP4 or IP6
address depending on the value size.
When a type is tagged user:fmt:be, the value is interpreted as a
big-endian integer (2, 4 or 8 bytes).
Example:
typedef struct in6_addr bpf_in6_addr
__attribute__((__btf_decl_tag__("user:fmt:ip")));
bpf_in6_addr in6;
$ bpftool map dump name .data
[{
"value": {
".data": [{
"in6": "2001:db8:130f::9c0:876a:130b"
}
]
}
}
]
versus
$ bpftool map dump name .data
[{
"value": {
".data": [{
"in6": {
"in6_u": {
"u6_addr8": [32,1,13,184,19,15,0,0,0,0,9,192,135,106,19,11
],
"u6_addr16": [288,47117,3859,0,0,49161,27271,2835
],
"u6_addr32": [3087860000,3859,3221815296,185821831
]
}
}
}
]
}
}
]
Signed-off-by: Nick Zavaritsky <[email protected]>
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At least one diff in series https://patchwork.kernel.org/project/netdevbpf/list/?series=1004635 expired. Closing PR. |
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Pull request for series with
subject: bpftool: Formatting defined by user:fmt: decl tag
version: 1
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=1004635