nft: Fix for add and delete of same rule in single batch

Another corner-case found when extending restore ordering test: If a
delete command in a dump referenced a rule added earlier within the same
dump, kernel would reject the resulting NFT_MSG_DELRULE command.

Catch this by assigning the rule to delete a RULE_ID value if it doesn't
have a handle yet. Since __nft_rule_del() does not duplicate the
nftnl_rule object when creating the NFT_COMPAT_RULE_DELETE command, this
RULE_ID value is added to both NEWRULE and DELRULE commands - exactly
what is needed to establish the reference.

Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Florian Westphal <fw@strlen.de>

diff --git a/iptables/nft.c b/iptables/nft.c
index a2c43e83cabe126749e9a12dea6c6a1061321403..0249cbbe486390ca01f1a380545f4e8c5362f73f 100644 (file)
--- a/iptables/nft.c
+++ b/iptables/nft.c
@@ -2199,6 +2199,9 @@ 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))
+               nftnl_rule_set_u32(r, NFTNL_RULE_ID, ++h->rule_id);
+
        obj = batch_rule_add(h, NFT_COMPAT_RULE_DELETE, r);
        if (!obj) {
                nftnl_rule_free(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 51f2422e15259c975e1bd7dc39938a4573c6c42a..3f1d229e915ff6ab043fd7faed17e2758b2c6591 100755 (executable)
--- a/iptables/tests/shell/testcases/ipt-restore/0003-restore-ordering_0
+++ b/iptables/tests/shell/testcases/ipt-restore/0003-restore-ordering_0
@@ -14,7 +14,7 @@ ipt_show() {
 
 $XT_MULTI iptables-restore <<EOF
 *filter
--A FORWARD -m comment --comment "appended rule" -j ACCEPT
+-A FORWARD -m comment --comment "rule 4" -j ACCEPT
 -I FORWARD 1 -m comment --comment "rule 1" -j ACCEPT
 -I FORWARD 2 -m comment --comment "rule 2" -j ACCEPT
 -I FORWARD 3 -m comment --comment "rule 3" -j ACCEPT
@@ -24,7 +24,7 @@ EOF
 EXPECT='-A FORWARD -m comment --comment "rule 1" -j ACCEPT
 -A FORWARD -m comment --comment "rule 2" -j ACCEPT
 -A FORWARD -m comment --comment "rule 3" -j ACCEPT
--A FORWARD -m comment --comment "appended rule" -j ACCEPT'
+-A FORWARD -m comment --comment "rule 4" -j ACCEPT'
 
 diff -u -Z <(echo -e "$EXPECT") <(ipt_show)
 
@@ -32,11 +32,14 @@ diff -u -Z <(echo -e "$EXPECT") <(ipt_show)
 
 $XT_MULTI iptables-restore --noflush <<EOF
 *filter
+-A FORWARD -m comment --comment "rule 5" -j ACCEPT
 -I FORWARD 1 -m comment --comment "rule 0.5" -j ACCEPT
 -I FORWARD 3 -m comment --comment "rule 1.5" -j ACCEPT
 -I FORWARD 5 -m comment --comment "rule 2.5" -j ACCEPT
 -I FORWARD 7 -m comment --comment "rule 3.5" -j ACCEPT
--I FORWARD 9 -m comment --comment "appended rule 2" -j ACCEPT
+-I FORWARD 9 -m comment --comment "rule 4.5" -j ACCEPT
+-I FORWARD 11 -m comment --comment "rule 5.5" -j ACCEPT
+-A FORWARD -m comment --comment "rule 6" -j ACCEPT
 COMMIT
 EOF
 
@@ -47,8 +50,11 @@ EXPECT='-A FORWARD -m comment --comment "rule 0.5" -j ACCEPT
 -A FORWARD -m comment --comment "rule 2.5" -j ACCEPT
 -A FORWARD -m comment --comment "rule 3" -j ACCEPT
 -A FORWARD -m comment --comment "rule 3.5" -j ACCEPT
--A FORWARD -m comment --comment "appended rule" -j ACCEPT
--A FORWARD -m comment --comment "appended rule 2" -j ACCEPT'
+-A FORWARD -m comment --comment "rule 4" -j ACCEPT
+-A FORWARD -m comment --comment "rule 4.5" -j ACCEPT
+-A FORWARD -m comment --comment "rule 5" -j ACCEPT
+-A FORWARD -m comment --comment "rule 5.5" -j ACCEPT
+-A FORWARD -m comment --comment "rule 6" -j ACCEPT'
 
 diff -u -Z <(echo -e "$EXPECT") <(ipt_show)
 
@@ -78,6 +84,8 @@ diff -u -Z <(echo -e "$EXPECT") <(ipt_show)
 
 $XT_MULTI iptables-restore --noflush <<EOF
 *filter
+-A FORWARD -m comment --comment "appended rule 4" -j ACCEPT
+-D FORWARD 7
 -D FORWARD -m comment --comment "appended rule 1" -j ACCEPT
 -D FORWARD 3
 -I FORWARD 3 -m comment --comment "manually replaced rule 2" -j ACCEPT