forked from pool/iptables
Add iptables-nft-fix-interface-comparisons.patch #1
172
iptables-nft-fix-interface-comparisons.patch
Normal file
172
iptables-nft-fix-interface-comparisons.patch
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From 40406dbfaefbc204134452b2747bae4f6a122848 Mon Sep 17 00:00:00 2001
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From: Jeremy Sowden <jeremy@azazel.net>
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Date: Mon, 18 Nov 2024 13:56:50 +0000
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Subject: nft: fix interface comparisons in `-C` commands
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Commit 9ccae6397475 ("nft: Leave interface masks alone when parsing from
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kernel") removed code which explicitly set interface masks to all ones. The
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result of this is that they are zero. However, they are used to mask interfaces
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in `is_same_interfaces`. Consequently, the masked values are alway zero, the
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comparisons are always true, and check commands which ought to fail succeed:
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# iptables -N test
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# iptables -A test -i lo \! -o lo -j REJECT
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# iptables -v -L test
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Chain test (0 references)
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pkts bytes target prot opt in out source destination
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0 0 REJECT all -- lo !lo anywhere anywhere reject-with icmp-port-unreachable
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# iptables -v -C test -i abcdefgh \! -o abcdefgh -j REJECT
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REJECT all opt -- in lo out !lo 0.0.0.0/0 -> 0.0.0.0/0 reject-with icmp-port-unreachable
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Remove the mask parameters from `is_same_interfaces`. Add a test-case.
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Fixes: 9ccae6397475 ("nft: Leave interface masks alone when parsing from kernel")
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Signed-off-by: Jeremy Sowden <jeremy@azazel.net>
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Signed-off-by: Phil Sutter <phil@nwl.cc>
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---
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iptables/nft-arp.c | 10 ++----
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iptables/nft-ipv4.c | 4 +--
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iptables/nft-ipv6.c | 6 +---
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iptables/nft-shared.c | 36 +++++-----------------
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iptables/nft-shared.h | 6 +---
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.../testcases/nft-only/0020-compare-interfaces_0 | 9 ++++++
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6 files changed, 22 insertions(+), 49 deletions(-)
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create mode 100755 iptables/tests/shell/testcases/nft-only/0020-compare-interfaces_0
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diff --git a/iptables/nft-arp.c b/iptables/nft-arp.c
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index 264864c3..c11d64c3 100644
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--- a/iptables/nft-arp.c
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+++ b/iptables/nft-arp.c
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@@ -385,14 +385,8 @@ static bool nft_arp_is_same(const struct iptables_command_state *cs_a,
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return false;
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}
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- return is_same_interfaces(a->arp.iniface,
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- a->arp.outiface,
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- (unsigned char *)a->arp.iniface_mask,
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- (unsigned char *)a->arp.outiface_mask,
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- b->arp.iniface,
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- b->arp.outiface,
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- (unsigned char *)b->arp.iniface_mask,
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- (unsigned char *)b->arp.outiface_mask);
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+ return is_same_interfaces(a->arp.iniface, a->arp.outiface,
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+ b->arp.iniface, b->arp.outiface);
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}
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static void nft_arp_save_chain(const struct nftnl_chain *c, const char *policy)
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diff --git a/iptables/nft-ipv4.c b/iptables/nft-ipv4.c
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index 74092875..0c8bd291 100644
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--- a/iptables/nft-ipv4.c
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+++ b/iptables/nft-ipv4.c
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@@ -113,9 +113,7 @@ static bool nft_ipv4_is_same(const struct iptables_command_state *a,
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}
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return is_same_interfaces(a->fw.ip.iniface, a->fw.ip.outiface,
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- a->fw.ip.iniface_mask, a->fw.ip.outiface_mask,
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- b->fw.ip.iniface, b->fw.ip.outiface,
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- b->fw.ip.iniface_mask, b->fw.ip.outiface_mask);
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+ b->fw.ip.iniface, b->fw.ip.outiface);
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}
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static void nft_ipv4_set_goto_flag(struct iptables_command_state *cs)
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diff --git a/iptables/nft-ipv6.c b/iptables/nft-ipv6.c
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index b184f8af..4dbb2af2 100644
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--- a/iptables/nft-ipv6.c
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+++ b/iptables/nft-ipv6.c
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@@ -99,11 +99,7 @@ static bool nft_ipv6_is_same(const struct iptables_command_state *a,
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}
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return is_same_interfaces(a->fw6.ipv6.iniface, a->fw6.ipv6.outiface,
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- a->fw6.ipv6.iniface_mask,
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- a->fw6.ipv6.outiface_mask,
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- b->fw6.ipv6.iniface, b->fw6.ipv6.outiface,
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- b->fw6.ipv6.iniface_mask,
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- b->fw6.ipv6.outiface_mask);
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+ b->fw6.ipv6.iniface, b->fw6.ipv6.outiface);
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}
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static void nft_ipv6_set_goto_flag(struct iptables_command_state *cs)
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diff --git a/iptables/nft-shared.c b/iptables/nft-shared.c
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index 6775578b..2c29e68f 100644
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--- a/iptables/nft-shared.c
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+++ b/iptables/nft-shared.c
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@@ -220,36 +220,16 @@ void add_l4proto(struct nft_handle *h, struct nftnl_rule *r,
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}
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bool is_same_interfaces(const char *a_iniface, const char *a_outiface,
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- unsigned const char *a_iniface_mask,
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- unsigned const char *a_outiface_mask,
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- const char *b_iniface, const char *b_outiface,
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- unsigned const char *b_iniface_mask,
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- unsigned const char *b_outiface_mask)
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+ const char *b_iniface, const char *b_outiface)
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{
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- int i;
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-
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- for (i = 0; i < IFNAMSIZ; i++) {
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- if (a_iniface_mask[i] != b_iniface_mask[i]) {
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- DEBUGP("different iniface mask %x, %x (%d)\n",
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- a_iniface_mask[i] & 0xff, b_iniface_mask[i] & 0xff, i);
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- return false;
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- }
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- if ((a_iniface[i] & a_iniface_mask[i])
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- != (b_iniface[i] & b_iniface_mask[i])) {
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- DEBUGP("different iniface\n");
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- return false;
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- }
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- if (a_outiface_mask[i] != b_outiface_mask[i]) {
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- DEBUGP("different outiface mask\n");
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- return false;
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- }
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- if ((a_outiface[i] & a_outiface_mask[i])
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- != (b_outiface[i] & b_outiface_mask[i])) {
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- DEBUGP("different outiface\n");
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- return false;
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- }
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+ if (strncmp(a_iniface, b_iniface, IFNAMSIZ)) {
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+ DEBUGP("different iniface\n");
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+ return false;
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+ }
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+ if (strncmp(a_outiface, b_outiface, IFNAMSIZ)) {
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+ DEBUGP("different outiface\n");
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+ return false;
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}
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-
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return true;
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}
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diff --git a/iptables/nft-shared.h b/iptables/nft-shared.h
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index 51d1e460..b57aee1f 100644
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--- a/iptables/nft-shared.h
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+++ b/iptables/nft-shared.h
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@@ -105,11 +105,7 @@ void add_l4proto(struct nft_handle *h, struct nftnl_rule *r, uint8_t proto, uint
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void add_compat(struct nftnl_rule *r, uint32_t proto, bool inv);
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bool is_same_interfaces(const char *a_iniface, const char *a_outiface,
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- unsigned const char *a_iniface_mask,
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- unsigned const char *a_outiface_mask,
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- const char *b_iniface, const char *b_outiface,
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- unsigned const char *b_iniface_mask,
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- unsigned const char *b_outiface_mask);
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+ const char *b_iniface, const char *b_outiface);
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void __get_cmp_data(struct nftnl_expr *e, void *data, size_t dlen, uint8_t *op);
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void get_cmp_data(struct nftnl_expr *e, void *data, size_t dlen, bool *inv);
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diff --git a/iptables/tests/shell/testcases/nft-only/0020-compare-interfaces_0 b/iptables/tests/shell/testcases/nft-only/0020-compare-interfaces_0
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new file mode 100755
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index 00000000..278cd648
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--- /dev/null
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+++ b/iptables/tests/shell/testcases/nft-only/0020-compare-interfaces_0
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@@ -0,0 +1,9 @@
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+#!/bin/bash
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+
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+[[ $XT_MULTI == *xtables-nft-multi ]] || { echo "skip $XT_MULTI"; exit 0; }
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+
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+$XT_MULTI iptables -N test
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+$XT_MULTI iptables -A test -i lo \! -o lo -j REJECT
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+$XT_MULTI iptables -C test -i abcdefgh \! -o abcdefgh -j REJECT 2>/dev/null && exit 1
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+
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+exit 0
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--
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cgit v1.2.3
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@ -1,3 +1,9 @@
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-------------------------------------------------------------------
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Mon Dec 2 13:40:26 UTC 2024 - Antonio Teixeira <antonio.teixeira@suse.com>
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- Add iptables-nft-fix-interface-comparisons.patch
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* fix '-C' commands for nft backend (bsc#1233690)
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-------------------------------------------------------------------
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-------------------------------------------------------------------
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Fri Nov 8 16:14:22 UTC 2024 - Jan Engelhardt <jengelh@inai.de>
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Fri Nov 8 16:14:22 UTC 2024 - Jan Engelhardt <jengelh@inai.de>
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@ -37,6 +37,7 @@ Source4: baselibs.conf
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Patch1: iptables-batch.patch
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Patch1: iptables-batch.patch
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Patch2: iptables-batch-lock.patch
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Patch2: iptables-batch-lock.patch
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Patch3: iptables-1.8.2-dont_read_garbage.patch
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Patch3: iptables-1.8.2-dont_read_garbage.patch
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Patch4: iptables-nft-fix-interface-comparisons.patch
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BuildRequires: bison
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BuildRequires: bison
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BuildRequires: fdupes
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BuildRequires: fdupes
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