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From 48021b277a1ab92480c43e1fa7573b00e33f5212 Mon Sep 17 00:00:00 2001
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From: Phil Sutter <psutter@redhat.com>
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Date: Fri, 14 Jan 2022 11:39:17 +0100
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Subject: [PATCH] evaluate: attempt to set_eval flag if dynamic updates
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requested
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2039594
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Upstream Status: nftables commit 8d443adfcc8c1
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Conflicts:
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* Context change due to missing commit 242965f452e64
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("src: add support for multi-statement in dynamic sets and maps")
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* Adjusted test-case: Due to missing kernel commit 7b1394892de8d
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("netfilter: nft_dynset: relax superfluous check on set updates"),
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'update' statement is allowed only if timeout flag is present
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commit 8d443adfcc8c19effd6be9a9c903ee96e374f2e8
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Author: Florian Westphal <fw@strlen.de>
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Date: Tue Jan 11 12:08:59 2022 +0100
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evaluate: attempt to set_eval flag if dynamic updates requested
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When passing no upper size limit, the dynset expression forces
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an internal 64k upperlimit.
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In some cases, this can result in 'nft -f' to restore the ruleset.
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Avoid this by always setting the EVAL flag on a set definition when
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we encounter packet-path update attempt in the batch.
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Reported-by: Yi Chen <yiche@redhat.com>
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Suggested-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Signed-off-by: Florian Westphal <fw@strlen.de>
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---
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src/evaluate.c | 11 +++++++
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.../testcases/sets/dumps/dynset_missing.nft | 12 +++++++
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tests/shell/testcases/sets/dynset_missing | 32 +++++++++++++++++++
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3 files changed, 55 insertions(+)
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create mode 100644 tests/shell/testcases/sets/dumps/dynset_missing.nft
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create mode 100755 tests/shell/testcases/sets/dynset_missing
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diff --git a/src/evaluate.c b/src/evaluate.c
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index 00ec20b..9381f23 100644
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--- a/src/evaluate.c
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+++ b/src/evaluate.c
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@@ -3076,6 +3076,8 @@ static int stmt_evaluate_log(struct eval_ctx *ctx, struct stmt *stmt)
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static int stmt_evaluate_set(struct eval_ctx *ctx, struct stmt *stmt)
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{
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+ struct set *this_set;
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+
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expr_set_context(&ctx->ectx, NULL, 0);
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if (expr_evaluate(ctx, &stmt->set.set) < 0)
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return -1;
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@@ -3103,6 +3105,15 @@ static int stmt_evaluate_set(struct eval_ctx *ctx, struct stmt *stmt)
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"meter statement must be stateful");
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}
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+ this_set = stmt->set.set->set;
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+
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+ /* Make sure EVAL flag is set on set definition so that kernel
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+ * picks a set that allows updates from the packet path.
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+ *
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+ * Alternatively we could error out in case 'flags dynamic' was
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+ * not given, but we can repair this here.
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+ */
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+ this_set->flags |= NFT_SET_EVAL;
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return 0;
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}
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diff --git a/tests/shell/testcases/sets/dumps/dynset_missing.nft b/tests/shell/testcases/sets/dumps/dynset_missing.nft
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new file mode 100644
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index 0000000..fdb1b97
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--- /dev/null
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+++ b/tests/shell/testcases/sets/dumps/dynset_missing.nft
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@@ -0,0 +1,12 @@
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+table ip test {
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+ set dlist {
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+ type ipv4_addr
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+ size 65535
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+ flags dynamic,timeout
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+ }
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+
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+ chain output {
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+ type filter hook output priority filter; policy accept;
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+ udp dport 1234 update @dlist { ip daddr } counter packets 0 bytes 0
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+ }
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+}
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diff --git a/tests/shell/testcases/sets/dynset_missing b/tests/shell/testcases/sets/dynset_missing
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new file mode 100755
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index 0000000..89afcd5
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--- /dev/null
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+++ b/tests/shell/testcases/sets/dynset_missing
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@@ -0,0 +1,32 @@
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+#!/bin/bash
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+
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+set -e
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+
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+$NFT -f /dev/stdin <
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+table ip test {
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+ chain output { type filter hook output priority 0;
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+ }
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+}
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+EOF
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+
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+# misses 'flags dynamic'
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+$NFT 'add set ip test dlist {type ipv4_addr; flags timeout; }'
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+
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+# picks rhash backend because 'size' was also missing.
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+$NFT 'add rule ip test output udp dport 1234 update @dlist { ip daddr } counter'
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+
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+tmpfile=$(mktemp)
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+
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+trap "rm -rf $tmpfile" EXIT
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+
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+# kernel has forced an 64k upper size, i.e. this restore file
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+# has 'size 65536' but no 'flags dynamic'.
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+$NFT list ruleset > $tmpfile
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+
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+# this restore works, because set is still the rhash backend.
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+$NFT -f $tmpfile # success
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+$NFT flush ruleset
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+
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+# fails without commit 'attempt to set_eval flag if dynamic updates requested',
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+# because set in $tmpfile has 'size x' but no 'flags dynamic'.
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+$NFT -f $tmpfile
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--
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2.31.1
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