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netlink: Pass extack to dump handlers

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Declare extack in netlink_dump and pass to dump handlers via
netlink_callback. Add any extack message after the dump_done_errno
allowing error messages to be returned. This will be useful when
strict checking is done on dump requests, returning why the dump
fails EINVAL.

Signed-off-by: David Ahern <dsahern@gmail.com>
Acked-by: Christian Brauner <christian@brauner.io>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern
2018-10-07 20:16:22 -07:00
committed by David S. Miller
parent 272a66173b
commit 4a19edb60d
2 changed files with 12 additions and 1 deletions
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include/linux/netlink.h
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@@ -176,6 +176,7 @@ struct netlink_callback {
void *data;
/* the module that dump function belong to */
struct module *module;
struct netlink_ext_ack *extack;
u16 family;
u16 min_dump_alloc;
unsigned int prev_seq, seq;