From: Pablo Neira Ayuso <pablo@netfilter.org>
To: netfilter-devel@vger.kernel.org
Cc: davem@davemloft.net, netdev@vger.kernel.org
Subject: [PATCH 7/7] netfilter: nf_tables: report EEXIST on overlaps
Date: Sun, 2 Aug 2020 20:31:48 +0200 [thread overview]
Message-ID: <20200802183149.2808-8-pablo@netfilter.org> (raw)
In-Reply-To: <20200802183149.2808-1-pablo@netfilter.org>
Replace EBUSY by EEXIST in the following cases:
- If the user adds a chain with a different configuration such as different
type, hook and priority.
- If the user adds a non-base chain that clashes with an existing basechain.
- If the user adds a { key : value } mapping element and the key exists
but the value differs.
- If the device already belongs to an existing flowtable.
User describe that this error reporting is confusing:
- https://bugzilla.netfilter.org/show_bug.cgi?id=1176
- https://bugzilla.netfilter.org/show_bug.cgi?id=1413
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
net/netfilter/nf_tables_api.c | 16 +++++++---------
1 file changed, 7 insertions(+), 9 deletions(-)
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index fac552b0179f..6571789989bc 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -2097,7 +2097,7 @@ static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
if (nla[NFTA_CHAIN_HOOK]) {
if (!nft_is_base_chain(chain))
- return -EBUSY;
+ return -EEXIST;
err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
false);
@@ -2107,21 +2107,21 @@ static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
basechain = nft_base_chain(chain);
if (basechain->type != hook.type) {
nft_chain_release_hook(&hook);
- return -EBUSY;
+ return -EEXIST;
}
if (ctx->family == NFPROTO_NETDEV) {
if (!nft_hook_list_equal(&basechain->hook_list,
&hook.list)) {
nft_chain_release_hook(&hook);
- return -EBUSY;
+ return -EEXIST;
}
} else {
ops = &basechain->ops;
if (ops->hooknum != hook.num ||
ops->priority != hook.priority) {
nft_chain_release_hook(&hook);
- return -EBUSY;
+ return -EEXIST;
}
}
nft_chain_release_hook(&hook);
@@ -5262,10 +5262,8 @@ static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
- nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF)) {
- err = -EBUSY;
+ nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
goto err_element_clash;
- }
if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
memcmp(nft_set_ext_data(ext),
@@ -5273,7 +5271,7 @@ static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
(nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
*nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
- err = -EBUSY;
+ goto err_element_clash;
else if (!(nlmsg_flags & NLM_F_EXCL))
err = 0;
} else if (err == -ENOTEMPTY) {
@@ -6423,7 +6421,7 @@ static int nft_register_flowtable_net_hooks(struct net *net,
list_for_each_entry(hook2, &ft->hook_list, list) {
if (hook->ops.dev == hook2->ops.dev &&
hook->ops.pf == hook2->ops.pf) {
- err = -EBUSY;
+ err = -EEXIST;
goto err_unregister_net_hooks;
}
}
--
2.20.1
next prev parent reply other threads:[~2020-08-02 18:32 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-02 18:31 [PATCH 0/7] Netfilter updates for net-next Pablo Neira Ayuso
2020-08-02 18:31 ` [PATCH 1/7] netfilter: nf_tables: Fix a use after free in nft_immediate_destroy() Pablo Neira Ayuso
2020-08-02 18:31 ` [PATCH 2/7] ipvs: queue delayed work to expire no destination connections if expire_nodest_conn=1 Pablo Neira Ayuso
2020-08-02 18:31 ` [PATCH 3/7] netfilter: Use fallthrough pseudo-keyword Pablo Neira Ayuso
2020-08-02 18:31 ` [PATCH 4/7] netfilter: Replace HTTP links with HTTPS ones Pablo Neira Ayuso
2020-08-02 18:31 ` [PATCH 5/7] netfilter: ip6tables: Remove redundant null checks Pablo Neira Ayuso
2020-08-02 18:31 ` [PATCH 6/7] netfilter: nf_tables: extended netlink error reporting for expressions Pablo Neira Ayuso
2020-08-02 18:31 ` Pablo Neira Ayuso [this message]
2020-08-03 23:03 ` [PATCH 0/7] Netfilter updates for net-next David Miller
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