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From 3696c4af80496a0dd5a3637e4be11754e2cdc99e Mon Sep 17 00:00:00 2001
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From: Phil Sutter <phil@nwl.cc>
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Date: Wed, 4 May 2022 11:19:16 +0200
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Subject: [PATCH] nft: Fix EPERM handling for extensions without rev 0
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Treating revision 0 as compatible in EPERM case works fine as long as
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there is a revision 0 of that extension defined in DSO. Fix the code for
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others: Extend the EPERM handling to all revisions and keep the existing
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warning for revision 0.
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Fixes: 17534cb18ed0a ("Improve error messages for unsupported extensions")
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Signed-off-by: Phil Sutter <phil@nwl.cc>
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(cherry picked from commit 8468fd4f7c85c21ab375402bc80d0188412b6cbf)
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---
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iptables/nft.c | 11 +++++++----
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.../shell/testcases/iptables/0008-unprivileged_0 | 6 ++++++
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2 files changed, 13 insertions(+), 4 deletions(-)
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diff --git a/iptables/nft.c b/iptables/nft.c
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index 9643abf2d0085..9839e8c683708 100644
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--- a/iptables/nft.c
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+++ b/iptables/nft.c
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@@ -3110,15 +3110,18 @@ int nft_compatible_revision(const char *name, uint8_t rev, int opt)
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err:
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mnl_socket_close(nl);
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- /* pretend revision 0 is valid -
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+ /* ignore EPERM and errors for revision 0 -
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* this is required for printing extension help texts as user, also
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* helps error messaging on unavailable kernel extension */
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- if (ret < 0 && rev == 0) {
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- if (errno != EPERM)
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+ if (ret < 0) {
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+ if (errno == EPERM)
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+ return 1;
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+ if (rev == 0) {
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fprintf(stderr,
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"Warning: Extension %s revision 0 not supported, missing kernel module?\n",
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name);
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- return 1;
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+ return 1;
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+ }
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}
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return ret < 0 ? 0 : 1;
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diff --git a/iptables/tests/shell/testcases/iptables/0008-unprivileged_0 b/iptables/tests/shell/testcases/iptables/0008-unprivileged_0
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index 43e3bc8721dbd..983531fef4720 100755
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--- a/iptables/tests/shell/testcases/iptables/0008-unprivileged_0
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+++ b/iptables/tests/shell/testcases/iptables/0008-unprivileged_0
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@@ -35,6 +35,12 @@ let "rc+=$?"
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grep_or_rc "DNAT target options:" <<< "$out"
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let "rc+=$?"
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+# TEE has no revision 0
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+out=$(run $XT_MULTI iptables -j TEE --help)
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+let "rc+=$?"
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+grep_or_rc "TEE target options:" <<< "$out"
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+let "rc+=$?"
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+
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out=$(run $XT_MULTI iptables -p tcp -j DNAT --help)
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let "rc+=$?"
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grep_or_rc "tcp match options:" <<< "$out"
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--
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2.34.1
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