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| author | Jakub Kicinski <kuba@kernel.org> | 2022-09-28 00:23:06 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2022-09-30 04:39:39 +0300 |
| commit | 5493a2ad0d20944b16aba7ed7a951a43ad1f5fba (patch) | |
| tree | c5b08ba52c12f879cd13daee72ec7d20c4ab1a02 /include | |
| parent | accc3b4a572bba903a801a393532272727f83f5b (diff) | |
| download | linux-5493a2ad0d20944b16aba7ed7a951a43ad1f5fba.tar.xz | |
docs: netlink: clarify the historical baggage of Netlink flags
nlmsg_flags are full of historical baggage, inconsistencies and
strangeness. Try to document it more thoroughly. Explain the meaning
of the ECHO flag (and while at it clarify the comment in the uAPI).
Handwave a little about the NEW request flags and how they make
sense on the surface but cater to really old paradigm before commands
were a thing.
I will add more notes on how to make use of ECHO and discouragement
for reuse of flags to the kernel-side documentation.
Link: https://lore.kernel.org/r/20220927212306.823862-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/uapi/linux/netlink.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/uapi/linux/netlink.h b/include/uapi/linux/netlink.h index e0689dbd2cde..e2ae82e3f9f7 100644 --- a/include/uapi/linux/netlink.h +++ b/include/uapi/linux/netlink.h @@ -62,7 +62,7 @@ struct nlmsghdr { #define NLM_F_REQUEST 0x01 /* It is request message. */ #define NLM_F_MULTI 0x02 /* Multipart message, terminated by NLMSG_DONE */ #define NLM_F_ACK 0x04 /* Reply with ack, with zero or error code */ -#define NLM_F_ECHO 0x08 /* Echo this request */ +#define NLM_F_ECHO 0x08 /* Receive resulting notifications */ #define NLM_F_DUMP_INTR 0x10 /* Dump was inconsistent due to sequence change */ #define NLM_F_DUMP_FILTERED 0x20 /* Dump was filtered as requested */ |