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zebra: Note when the netlink DUMP command is interrupted

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There exists code paths in the linux kernel where a dump command
will be interrupted( I am not sure I understand what this really
means ) and the data sent back from the kernel is wrong or incomplete.

At this point in time I am not 100% certain what should be done, but
let's start noticing that this has happened so we can formulate a plan
or allow the end operator to know bad stuff is a foot at the circle K.

Signed-off-by: Donald Sharp <sharpd@nvidia.com>
This commit is contained in:
Donald Sharp 2022-03-25 19:08:14 -04:00
parent 5bc17d7bd0
commit 2f71996a68
1 changed files with 12 additions and 0 deletions
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12
zebra/kernel_netlink.c
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@ -1016,6 +1016,18 @@ int netlink_parse_info(int (*filter)(struct nlmsghdr *, ns_id_t, int),
return err;
}
/*
* What is the right thing to do? The kernel
* is telling us that the dump request was interrupted
* and we more than likely are out of luck and have
* missed data from the kernel. At this point in time
* lets just note that this is happening.
*/
if (h->nlmsg_flags & NLM_F_DUMP_INTR)
flog_err(
EC_ZEBRA_NETLINK_BAD_SEQUENCE,
"netlink recvmsg: The Dump request was interrupted");
/* OK we got netlink message. */
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug(