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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>
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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1
include/linux/netlink.h
View File

@ -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;

12
net/netlink/af_netlink.c
View File

@ -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