From 5f074bda5a10d96b965b4e60bd0f56762bb227d30bbb1c4b617012e3d6319e18 Mon Sep 17 00:00:00 2001 From: Antonio Teixeira Date: Mon, 2 Dec 2024 10:10:43 -0300 Subject: [PATCH] Add iptables-nft-fix-interface-comparisons.patch --- iptables-nft-fix-interface-comparisons.patch | 172 +++++++++++++++++++ iptables.changes | 6 + iptables.spec | 1 + 3 files changed, 179 insertions(+) create mode 100644 iptables-nft-fix-interface-comparisons.patch diff --git a/iptables-nft-fix-interface-comparisons.patch b/iptables-nft-fix-interface-comparisons.patch new file mode 100644 index 0000000..a87d487 --- /dev/null +++ b/iptables-nft-fix-interface-comparisons.patch @@ -0,0 +1,172 @@ + From 40406dbfaefbc204134452b2747bae4f6a122848 Mon Sep 17 00:00:00 2001 +From: Jeremy Sowden +Date: Mon, 18 Nov 2024 13:56:50 +0000 +Subject: nft: fix interface comparisons in `-C` commands + +Commit 9ccae6397475 ("nft: Leave interface masks alone when parsing from +kernel") removed code which explicitly set interface masks to all ones. The +result of this is that they are zero. However, they are used to mask interfaces +in `is_same_interfaces`. Consequently, the masked values are alway zero, the +comparisons are always true, and check commands which ought to fail succeed: + + # iptables -N test + # iptables -A test -i lo \! -o lo -j REJECT + # iptables -v -L test + Chain test (0 references) + pkts bytes target prot opt in out source destination + 0 0 REJECT all -- lo !lo anywhere anywhere reject-with icmp-port-unreachable + # iptables -v -C test -i abcdefgh \! -o abcdefgh -j REJECT + REJECT all opt -- in lo out !lo 0.0.0.0/0 -> 0.0.0.0/0 reject-with icmp-port-unreachable + +Remove the mask parameters from `is_same_interfaces`. Add a test-case. + +Fixes: 9ccae6397475 ("nft: Leave interface masks alone when parsing from kernel") +Signed-off-by: Jeremy Sowden +Signed-off-by: Phil Sutter +--- + iptables/nft-arp.c | 10 ++---- + iptables/nft-ipv4.c | 4 +-- + iptables/nft-ipv6.c | 6 +--- + iptables/nft-shared.c | 36 +++++----------------- + iptables/nft-shared.h | 6 +--- + .../testcases/nft-only/0020-compare-interfaces_0 | 9 ++++++ + 6 files changed, 22 insertions(+), 49 deletions(-) + create mode 100755 iptables/tests/shell/testcases/nft-only/0020-compare-interfaces_0 + +diff --git a/iptables/nft-arp.c b/iptables/nft-arp.c +index 264864c3..c11d64c3 100644 +--- a/iptables/nft-arp.c ++++ b/iptables/nft-arp.c +@@ -385,14 +385,8 @@ static bool nft_arp_is_same(const struct iptables_command_state *cs_a, + return false; + } + +- return is_same_interfaces(a->arp.iniface, +- a->arp.outiface, +- (unsigned char *)a->arp.iniface_mask, +- (unsigned char *)a->arp.outiface_mask, +- b->arp.iniface, +- b->arp.outiface, +- (unsigned char *)b->arp.iniface_mask, +- (unsigned char *)b->arp.outiface_mask); ++ return is_same_interfaces(a->arp.iniface, a->arp.outiface, ++ b->arp.iniface, b->arp.outiface); + } + + static void nft_arp_save_chain(const struct nftnl_chain *c, const char *policy) +diff --git a/iptables/nft-ipv4.c b/iptables/nft-ipv4.c +index 74092875..0c8bd291 100644 +--- a/iptables/nft-ipv4.c ++++ b/iptables/nft-ipv4.c +@@ -113,9 +113,7 @@ static bool nft_ipv4_is_same(const struct iptables_command_state *a, + } + + return is_same_interfaces(a->fw.ip.iniface, a->fw.ip.outiface, +- a->fw.ip.iniface_mask, a->fw.ip.outiface_mask, +- b->fw.ip.iniface, b->fw.ip.outiface, +- b->fw.ip.iniface_mask, b->fw.ip.outiface_mask); ++ b->fw.ip.iniface, b->fw.ip.outiface); + } + + static void nft_ipv4_set_goto_flag(struct iptables_command_state *cs) +diff --git a/iptables/nft-ipv6.c b/iptables/nft-ipv6.c +index b184f8af..4dbb2af2 100644 +--- a/iptables/nft-ipv6.c ++++ b/iptables/nft-ipv6.c +@@ -99,11 +99,7 @@ static bool nft_ipv6_is_same(const struct iptables_command_state *a, + } + + return is_same_interfaces(a->fw6.ipv6.iniface, a->fw6.ipv6.outiface, +- a->fw6.ipv6.iniface_mask, +- a->fw6.ipv6.outiface_mask, +- b->fw6.ipv6.iniface, b->fw6.ipv6.outiface, +- b->fw6.ipv6.iniface_mask, +- b->fw6.ipv6.outiface_mask); ++ b->fw6.ipv6.iniface, b->fw6.ipv6.outiface); + } + + static void nft_ipv6_set_goto_flag(struct iptables_command_state *cs) +diff --git a/iptables/nft-shared.c b/iptables/nft-shared.c +index 6775578b..2c29e68f 100644 +--- a/iptables/nft-shared.c ++++ b/iptables/nft-shared.c +@@ -220,36 +220,16 @@ void add_l4proto(struct nft_handle *h, struct nftnl_rule *r, + } + + bool is_same_interfaces(const char *a_iniface, const char *a_outiface, +- unsigned const char *a_iniface_mask, +- unsigned const char *a_outiface_mask, +- const char *b_iniface, const char *b_outiface, +- unsigned const char *b_iniface_mask, +- unsigned const char *b_outiface_mask) ++ const char *b_iniface, const char *b_outiface) + { +- int i; +- +- for (i = 0; i < IFNAMSIZ; i++) { +- if (a_iniface_mask[i] != b_iniface_mask[i]) { +- DEBUGP("different iniface mask %x, %x (%d)\n", +- a_iniface_mask[i] & 0xff, b_iniface_mask[i] & 0xff, i); +- return false; +- } +- if ((a_iniface[i] & a_iniface_mask[i]) +- != (b_iniface[i] & b_iniface_mask[i])) { +- DEBUGP("different iniface\n"); +- return false; +- } +- if (a_outiface_mask[i] != b_outiface_mask[i]) { +- DEBUGP("different outiface mask\n"); +- return false; +- } +- if ((a_outiface[i] & a_outiface_mask[i]) +- != (b_outiface[i] & b_outiface_mask[i])) { +- DEBUGP("different outiface\n"); +- return false; +- } ++ if (strncmp(a_iniface, b_iniface, IFNAMSIZ)) { ++ DEBUGP("different iniface\n"); ++ return false; ++ } ++ if (strncmp(a_outiface, b_outiface, IFNAMSIZ)) { ++ DEBUGP("different outiface\n"); ++ return false; + } +- + return true; + } + +diff --git a/iptables/nft-shared.h b/iptables/nft-shared.h +index 51d1e460..b57aee1f 100644 +--- a/iptables/nft-shared.h ++++ b/iptables/nft-shared.h +@@ -105,11 +105,7 @@ void add_l4proto(struct nft_handle *h, struct nftnl_rule *r, uint8_t proto, uint + void add_compat(struct nftnl_rule *r, uint32_t proto, bool inv); + + bool is_same_interfaces(const char *a_iniface, const char *a_outiface, +- unsigned const char *a_iniface_mask, +- unsigned const char *a_outiface_mask, +- const char *b_iniface, const char *b_outiface, +- unsigned const char *b_iniface_mask, +- unsigned const char *b_outiface_mask); ++ const char *b_iniface, const char *b_outiface); + + void __get_cmp_data(struct nftnl_expr *e, void *data, size_t dlen, uint8_t *op); + void get_cmp_data(struct nftnl_expr *e, void *data, size_t dlen, bool *inv); +diff --git a/iptables/tests/shell/testcases/nft-only/0020-compare-interfaces_0 b/iptables/tests/shell/testcases/nft-only/0020-compare-interfaces_0 +new file mode 100755 +index 00000000..278cd648 +--- /dev/null ++++ b/iptables/tests/shell/testcases/nft-only/0020-compare-interfaces_0 +@@ -0,0 +1,9 @@ ++#!/bin/bash ++ ++[[ $XT_MULTI == *xtables-nft-multi ]] || { echo "skip $XT_MULTI"; exit 0; } ++ ++$XT_MULTI iptables -N test ++$XT_MULTI iptables -A test -i lo \! -o lo -j REJECT ++$XT_MULTI iptables -C test -i abcdefgh \! -o abcdefgh -j REJECT 2>/dev/null && exit 1 ++ ++exit 0 +-- +cgit v1.2.3 + diff --git a/iptables.changes b/iptables.changes index 4b4ac15..77aac07 100644 --- a/iptables.changes +++ b/iptables.changes @@ -1,3 +1,9 @@ +------------------------------------------------------------------- +Mon Dec 2 13:40:26 UTC 2024 - Antonio Teixeira + +- Add iptables-nft-fix-interface-comparisons.patch + * fix '-C' commands for nft backend (bsc#1233690) + ------------------------------------------------------------------- Fri Nov 8 16:14:22 UTC 2024 - Jan Engelhardt diff --git a/iptables.spec b/iptables.spec index 68b89bb..0804eea 100644 --- a/iptables.spec +++ b/iptables.spec @@ -37,6 +37,7 @@ Source4: baselibs.conf Patch1: iptables-batch.patch Patch2: iptables-batch-lock.patch Patch3: iptables-1.8.2-dont_read_garbage.patch +Patch4: iptables-nft-fix-interface-comparisons.patch BuildRequires: bison BuildRequires: fdupes