xfrm/compat: Add 64=>32-bit messages translator

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Provide the kernel-to-user translator under XFRM_USER_COMPAT, that
creates for 64-bit xfrm-user message a 32-bit translation and puts it
in skb's frag_list. net/compat.c layer provides MSG_CMSG_COMPAT to
decide if the message should be taken from skb or frag_list.
(used by wext-core which has also an ABI difference)

Kernel sends 64-bit xfrm messages to the userspace for:
- multicast (monitor events)
- netlink dumps

Wire up the translator to xfrm_nlmsg_multicast().

Signed-off-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

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Dmitry Safonov 2020-09-21 15:36:52 +01:00 • committed by Steffen Klassert

parent c9e7c76d70

commit 5461fc0c8d

3 changed files with 315 additions and 1 deletions

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5

include/net/xfrm.h

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296

net/xfrm/xfrm_compat.c

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15

net/xfrm/xfrm_user.c

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