From 5fd85822bd12a02f1a921243f605fc6238d705b4 Mon Sep 17 00:00:00 2001 From: Phil Sutter Date: Tue, 28 Feb 2023 18:09:25 +0100 Subject: nft-restore: Fix for deletion of new, referenced rule Combining multiple corner-cases here: * Insert a rule before another new one which is not the first. Triggers NFTNL_RULE_ID assignment of the latter. * Delete the referenced new rule in the same batch again. Causes overwriting of the previously assigned RULE_ID. Consequently, iptables-nft-restore fails during *insert*, because the reference is dangling. Reported-by: Eric Garver Fixes: 760b35b46e4cc ("nft: Fix for add and delete of same rule in single batch") Signed-off-by: Phil Sutter Tested-by: Eric Garver --- iptables/nft.c | 3 ++- .../shell/testcases/ipt-restore/0003-restore-ordering_0 | 16 ++++++++++++++++ 2 files changed, 18 insertions(+), 1 deletion(-) diff --git a/iptables/nft.c b/iptables/nft.c index 63468cf3..5896fd41 100644 --- a/iptables/nft.c +++ b/iptables/nft.c @@ -2343,7 +2343,8 @@ static int __nft_rule_del(struct nft_handle *h, struct nftnl_rule *r) nftnl_rule_list_del(r); - if (!nftnl_rule_get_u64(r, NFTNL_RULE_HANDLE)) + if (!nftnl_rule_get_u64(r, NFTNL_RULE_HANDLE) && + !nftnl_rule_get_u32(r, NFTNL_RULE_ID)) nftnl_rule_set_u32(r, NFTNL_RULE_ID, ++h->rule_id); obj = batch_rule_add(h, NFT_COMPAT_RULE_DELETE, r); diff --git a/iptables/tests/shell/testcases/ipt-restore/0003-restore-ordering_0 b/iptables/tests/shell/testcases/ipt-restore/0003-restore-ordering_0 index 3f1d229e..5482b7ea 100755 --- a/iptables/tests/shell/testcases/ipt-restore/0003-restore-ordering_0 +++ b/iptables/tests/shell/testcases/ipt-restore/0003-restore-ordering_0 @@ -123,3 +123,19 @@ EXPECT='-A FORWARD -m comment --comment "rule 1" -j ACCEPT -A FORWARD -m comment --comment "rule 3" -j ACCEPT' diff -u -Z <(echo -e "$EXPECT") <(ipt_show) + +# test adding, referencing and deleting the same rule in a batch + +$XT_MULTI iptables-restore <