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Message-ID: <20230928144916.18339-4-fw@strlen.de>
Date: Thu, 28 Sep 2023 16:49:00 +0200
From: Florian Westphal <fw@...len.de>
To: <netdev@...r.kernel.org>
Cc: Paolo Abeni <pabeni@...hat.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
<netfilter-devel@...r.kernel.org>,
Pablo Neira Ayuso <pablo@...filter.org>,
Phil Sutter <phil@....cc>
Subject: [PATCH net-next 3/4] netfilter: nf_tables: missing extended netlink error in lookup functions
From: Pablo Neira Ayuso <pablo@...filter.org>
Set netlink extended error reporting for several lookup functions which
allows userspace to infer what is the error cause.
Reported-by: Phil Sutter <phil@....cc>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Florian Westphal <fw@...len.de>
---
net/netfilter/nf_tables_api.c | 25 +++++++++++++++++++------
1 file changed, 19 insertions(+), 6 deletions(-)
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 4356189360fb..f993c237afd0 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -4695,8 +4695,10 @@ static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
return -EINVAL;
set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
- if (IS_ERR(set))
+ if (IS_ERR(set)) {
+ NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
return PTR_ERR(set);
+ }
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
if (skb2 == NULL)
@@ -6025,8 +6027,10 @@ static int nf_tables_getsetelem(struct sk_buff *skb,
}
set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
- if (IS_ERR(set))
+ if (IS_ERR(set)) {
+ NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_SET]);
return PTR_ERR(set);
+ }
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
@@ -6919,8 +6923,10 @@ static int nf_tables_newsetelem(struct sk_buff *skb,
set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
- if (IS_ERR(set))
+ if (IS_ERR(set)) {
+ NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_SET]);
return PTR_ERR(set);
+ }
if (!list_empty(&set->bindings) &&
(set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
@@ -7195,8 +7201,10 @@ static int nf_tables_delsetelem(struct sk_buff *skb,
}
set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
- if (IS_ERR(set))
+ if (IS_ERR(set)) {
+ NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_SET]);
return PTR_ERR(set);
+ }
if (nft_set_is_anonymous(set))
return -EOPNOTSUPP;
@@ -8680,6 +8688,7 @@ static int nf_tables_getflowtable(struct sk_buff *skb,
const struct nfnl_info *info,
const struct nlattr * const nla[])
{
+ struct netlink_ext_ack *extack = info->extack;
u8 genmask = nft_genmask_cur(info->net);
u8 family = info->nfmsg->nfgen_family;
struct nft_flowtable *flowtable;
@@ -8705,13 +8714,17 @@ static int nf_tables_getflowtable(struct sk_buff *skb,
table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
genmask, 0);
- if (IS_ERR(table))
+ if (IS_ERR(table)) {
+ NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
return PTR_ERR(table);
+ }
flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
genmask);
- if (IS_ERR(flowtable))
+ if (IS_ERR(flowtable)) {
+ NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
return PTR_ERR(flowtable);
+ }
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
if (!skb2)
--
2.41.0
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