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UPSTREAM: netfilter: nf_tables: disallow rule removal from chain binding

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[ Upstream commit f15f29fd47 ]

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 62e1e94b24
("netfilter: nf_tables: reject unbound chain set before commit phase").

Bug: 302085977
Fixes: d0e2c7de92 ("netfilter: nf_tables: add NFT_CHAIN_BINDING")
Reported-by: Kevin Rich <kevinrich1337@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit 9af8bb2afe)
Signed-off-by: Lee Jones <joneslee@google.com>
Change-Id: I8b05dc37062824db4c2901000fdf701b38605d32
This commit is contained in:
Pablo Neira Ayuso
2023-09-07 08:22:33 +02:00
committed by Treehugger Robot
parent 7d088a3e4f
commit 83ebd50235
1 changed files with 12 additions and 4 deletions
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16
net/netfilter/nf_tables_api.c
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@@ -1322,7 +1322,7 @@ static int nft_flush_table(struct nft_ctx *ctx)
if (!nft_is_active_next(ctx->net, chain)) if (!nft_is_active_next(ctx->net, chain))
continue; continue;
if (nft_chain_is_bound(chain)) if (nft_chain_binding(chain))
continue; continue;
ctx->chain = chain; ctx->chain = chain;
@@ -1367,7 +1367,7 @@ static int nft_flush_table(struct nft_ctx *ctx)
if (!nft_is_active_next(ctx->net, chain)) if (!nft_is_active_next(ctx->net, chain))
continue; continue;
if (nft_chain_is_bound(chain)) if (nft_chain_binding(chain))
continue; continue;
ctx->chain = chain; ctx->chain = chain;
@@ -2684,6 +2684,9 @@ static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
return PTR_ERR(chain); return PTR_ERR(chain);
} }
if (nft_chain_binding(chain))
return -EOPNOTSUPP;
if (info->nlh->nlmsg_flags & NLM_F_NONREC && if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
chain->use > 0) chain->use > 0)
return -EBUSY; return -EBUSY;
@@ -3666,6 +3669,11 @@ static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
} }
if (info->nlh->nlmsg_flags & NLM_F_REPLACE) { 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); err = nft_delrule(&ctx, old_rule);
if (err < 0) if (err < 0)
goto err_destroy_flow_rule; goto err_destroy_flow_rule;
@@ -3771,7 +3779,7 @@ static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]); NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
return PTR_ERR(chain); return PTR_ERR(chain);
} }
if (nft_chain_is_bound(chain)) if (nft_chain_binding(chain))
return -EOPNOTSUPP; return -EOPNOTSUPP;
} }
@@ -3801,7 +3809,7 @@ static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
list_for_each_entry(chain, &table->chains, list) { list_for_each_entry(chain, &table->chains, list) {
if (!nft_is_active_next(net, chain)) if (!nft_is_active_next(net, chain))
continue; continue;
if (nft_chain_is_bound(chain)) if (nft_chain_binding(chain))
continue; continue;
ctx.chain = chain; ctx.chain = chain;