From: Pablo Neira Ayuso <pablo@netfilter.org>
To: netfilter-devel@vger.kernel.org
Cc: davem@davemloft.net, netdev@vger.kernel.org, kuba@kernel.org,
pabeni@redhat.com, edumazet@google.com
Subject: [PATCH net 1/9] netfilter: nf_tables: disallow rule removal from chain binding
Date: Wed, 13 Sep 2023 23:57:52 +0200 [thread overview]
Message-ID: <20230913215800.107269-2-pablo@netfilter.org> (raw)
In-Reply-To: <20230913215800.107269-1-pablo@netfilter.org>
Chain binding only requires the rule addition/insertion command within
the same transaction. Removal of rules from chain bindings within the
same transaction makes no sense, userspace does not utilize this
feature. Replace nft_chain_is_bound() check to nft_chain_binding() in
rule deletion commands. Replace command implies a rule deletion, reject
this command too.
Rule flush command can also safely rely on this nft_chain_binding()
check because unbound chains are not allowed since 62e1e94b246e
("netfilter: nf_tables: reject unbound chain set before commit phase").
Fixes: d0e2c7de92c7 ("netfilter: nf_tables: add NFT_CHAIN_BINDING")
Reported-by: Kevin Rich <kevinrich1337@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
net/netfilter/nf_tables_api.c | 18 +++++++++++++-----
1 file changed, 13 insertions(+), 5 deletions(-)
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index e429ebba74b3..895c6e4fba97 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -1432,7 +1432,7 @@ static int nft_flush_table(struct nft_ctx *ctx)
if (!nft_is_active_next(ctx->net, chain))
continue;
- if (nft_chain_is_bound(chain))
+ if (nft_chain_binding(chain))
continue;
ctx->chain = chain;
@@ -1477,7 +1477,7 @@ static int nft_flush_table(struct nft_ctx *ctx)
if (!nft_is_active_next(ctx->net, chain))
continue;
- if (nft_chain_is_bound(chain))
+ if (nft_chain_binding(chain))
continue;
ctx->chain = chain;
@@ -2910,6 +2910,9 @@ static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
return PTR_ERR(chain);
}
+ if (nft_chain_binding(chain))
+ return -EOPNOTSUPP;
+
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
if (nla[NFTA_CHAIN_HOOK]) {
@@ -3971,6 +3974,11 @@ static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
}
if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
+ if (nft_chain_binding(chain)) {
+ err = -EOPNOTSUPP;
+ goto err_destroy_flow_rule;
+ }
+
err = nft_delrule(&ctx, old_rule);
if (err < 0)
goto err_destroy_flow_rule;
@@ -4078,7 +4086,7 @@ static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
return PTR_ERR(chain);
}
- if (nft_chain_is_bound(chain))
+ if (nft_chain_binding(chain))
return -EOPNOTSUPP;
}
@@ -4112,7 +4120,7 @@ static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
list_for_each_entry(chain, &table->chains, list) {
if (!nft_is_active_next(net, chain))
continue;
- if (nft_chain_is_bound(chain))
+ if (nft_chain_binding(chain))
continue;
ctx.chain = chain;
@@ -11054,7 +11062,7 @@ static void __nft_release_table(struct net *net, struct nft_table *table)
ctx.family = table->family;
ctx.table = table;
list_for_each_entry(chain, &table->chains, list) {
- if (nft_chain_is_bound(chain))
+ if (nft_chain_binding(chain))
continue;
ctx.chain = chain;
--
2.30.2
next prev parent reply other threads:[~2023-09-13 21:58 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-13 21:57 [PATCH net 0/9] Netfilter fixes for net Pablo Neira Ayuso
2023-09-13 21:57 ` Pablo Neira Ayuso [this message]
2023-09-13 21:57 ` [PATCH net 2/9] netfilter: nft_set_rbtree: use read spinlock to avoid datapath contention Pablo Neira Ayuso
2023-09-13 21:57 ` [PATCH net 3/9] netfilter: nft_set_pipapo: call nft_trans_gc_queue_sync() in catchall GC Pablo Neira Ayuso
2023-09-13 21:57 ` [PATCH net 4/9] netfilter: nft_set_pipapo: stop GC iteration if GC transaction allocation fails Pablo Neira Ayuso
2023-09-13 21:57 ` [PATCH net 5/9] netfilter: nft_set_hash: try later when GC hits EAGAIN on iteration Pablo Neira Ayuso
2023-09-13 21:57 ` [PATCH net 6/9] netfilter: nf_tables: disallow element removal on anonymous sets Pablo Neira Ayuso
2023-09-13 21:57 ` [PATCH net 7/9] netfilter: conntrack: fix extension size table Pablo Neira Ayuso
2023-09-13 21:57 ` [PATCH net 8/9] netfilter: nf_tables: Fix entries val in rule reset audit log Pablo Neira Ayuso
2023-09-13 21:58 ` [PATCH net 9/9] selftests: netfilter: Test nf_tables audit logging Pablo Neira Ayuso
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