diff options
| author |   David Ahern <dsahern@gmail.com> | 2018-10-07 20:16:22 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2018-10-08 10:39:03 -0700 |
| commit | 4a19edb60d0203cd5bf95a8b46ea8f63fd41194c (patch) | |
| tree | 741909355e9359619927e90759c0f0d354c4680c /net/netlink | |
| parent | isdn/gigaset: mark expected switch fall-throughs (diff) | |
| download | linux-dev-4a19edb60d0203cd5bf95a8b46ea8f63fd41194c.tar.xz linux-dev-4a19edb60d0203cd5bf95a8b46ea8f63fd41194c.zip | |
netlink: Pass extack to dump handlers
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>
Diffstat (limited to 'net/netlink')
| -rw-r--r-- | net/netlink/af_netlink.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c index e3a0538ec0be..7ac585f33a9e 100644 --- a/net/netlink/af_netlink.c +++ b/net/netlink/af_netlink.c @@ -2171,6 +2171,7 @@ EXPORT_SYMBOL(__nlmsg_put); static int netlink_dump(struct sock *sk) { struct netlink_sock *nlk = nlk_sk(sk); + struct netlink_ext_ack extack = {}; struct netlink_callback *cb; struct sk_buff *skb = NULL; struct nlmsghdr *nlh; @@ -2222,8 +2223,11 @@ static int netlink_dump(struct sock *sk) skb_reserve(skb, skb_tailroom(skb) - alloc_size); netlink_skb_set_owner_r(skb, sk); - if (nlk->dump_done_errno > 0) + if (nlk->dump_done_errno > 0) { + cb->extack = &extack; nlk->dump_done_errno = cb->dump(skb, cb); + cb->extack = NULL; + } if (nlk->dump_done_errno > 0 || skb_tailroom(skb) < nlmsg_total_size(sizeof(nlk->dump_done_errno))) { @@ -2246,6 +2250,12 @@ static int netlink_dump(struct sock *sk) memcpy(nlmsg_data(nlh), &nlk->dump_done_errno, sizeof(nlk->dump_done_errno)); + if (extack._msg && nlk->flags & NETLINK_F_EXT_ACK) { + nlh->nlmsg_flags |= NLM_F_ACK_TLVS; + if (!nla_put_string(skb, NLMSGERR_ATTR_MSG, extack._msg)) + nlmsg_end(skb, nlh); + } + if (sk_filter(sk, skb)) kfree_skb(skb); else |