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authorMaciej Żenczykowski <maze@google.com>2023-12-06 20:36:12 +0300
committerDavid S. Miller <davem@davemloft.net>2023-12-08 13:40:51 +0300
commitbd4a816752bab609dd6d65ae021387beb9e2ddbd (patch)
tree95e81b5605988babb87fe1ecbbe9fe5032124555 /net
parente5dc5afff62f3e97e86c3643ec9fcad23de4f2d3 (diff)
downloadlinux-bd4a816752bab609dd6d65ae021387beb9e2ddbd.tar.xz
net: ipv6: support reporting otherwise unknown prefix flags in RTM_NEWPREFIX
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 <dsahern@kernel.org> Cc: Lorenzo Colitti <lorenzo@google.com> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Maciej Żenczykowski <maze@google.com> Reviewed-by: David Ahern <dsahern@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv6/addrconf.c6
1 files changed, 1 insertions, 5 deletions
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 3aaea56b5166..2692a7b24c40 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -6149,11 +6149,7 @@ 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;