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net: ipv6: support reporting otherwise unknown prefix flags in RTM_NEWPREFIX

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[ Upstream commit bd4a816752bab609dd6d65ae021387beb9e2ddbd ]

Lorenzo points out that we effectively clear all unknown
flags from PIO when copying them to userspace in the netlink
RTM_NEWPREFIX notification.

We could fix this one at a time as new flags are defined,
or in one fell swoop - I choose the latter.

We could either define 6 new reserved flags (reserved1..6) and handle
them individually (and rename them as new flags are defined), or we
could simply copy the entire unmodified byte over - I choose the latter.

This unfortunately requires some anonymous union/struct magic,
so we add a static assert on the struct size for a little extra safety.

Cc: David Ahern <[email protected]>
Cc: Lorenzo Colitti <[email protected]>
Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Maciej Żenczykowski <[email protected]>
Reviewed-by: David Ahern <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
This commit is contained in:
Maciej Żenczykowski 2023-12-06 09:36:12 -08:00 • committed by Greg Kroah-Hartman
commit 9354e0acdb
3 changed files with 11 additions and 11 deletions
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6
net/ipv6/addrconf.c
View file

@ -5977,11 +5977,7 @@ static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
pmsg->prefix_len = pinfo->prefix_len;
pmsg->prefix_type = pinfo->type;
pmsg->prefix_pad3 = 0;
pmsg->prefix_flags = 0;
if (pinfo->onlink)
pmsg->prefix_flags |= IF_PREFIX_ONLINK;
if (pinfo->autoconf)
pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
pmsg->prefix_flags = pinfo->flags;
if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
goto nla_put_failure;