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From f70e667bbc14c1dbf96b8732704aea294e4dcaa7 Mon Sep 17 00:00:00 2001
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From: Phil Sutter <phil@nwl.cc>
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Date: Thu, 30 Jun 2022 18:04:39 +0200
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Subject: [PATCH] libxtables: Fix unsupported extension warning corner case
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Some extensions are not supported in revision 0 by user space anymore,
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for those the warning in xtables_compatible_revision() does not print as
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no revision 0 is tried.
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To fix this, one has to track if none of the user space supported
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revisions were accepted by the kernel. Therefore add respective logic to
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xtables_find_{target,match}().
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Note that this does not lead to duplicated warnings for unsupported
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extensions that have a revision 0 because xtables_compatible_revision()
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returns true for them to allow for extension's help output.
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For the record, these ip6tables extensions are affected: set/SET,
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socket, tos/TOS, TPROXY and SNAT. In addition to that, TEE is affected
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for both families.
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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 552c4a2f9e5706fef5f7abb27d1492a78bbb2a37)
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---
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libxtables/xtables.c | 14 ++++++++++++++
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1 file changed, 14 insertions(+)
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diff --git a/libxtables/xtables.c b/libxtables/xtables.c
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index a5c8d7e2c17ef..89547fb3ab947 100644
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--- a/libxtables/xtables.c
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+++ b/libxtables/xtables.c
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@@ -702,6 +702,7 @@ xtables_find_match(const char *name, enum xtables_tryload tryload,
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struct xtables_match *ptr;
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const char *icmp6 = "icmp6";
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bool found = false;
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+ bool seen = false;
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if (strlen(name) >= XT_EXTENSION_MAXNAMELEN)
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xtables_error(PARAMETER_PROBLEM,
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@@ -720,6 +721,7 @@ xtables_find_match(const char *name, enum xtables_tryload tryload,
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if (extension_cmp(name, (*dptr)->name, (*dptr)->family)) {
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ptr = *dptr;
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*dptr = (*dptr)->next;
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+ seen = true;
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if (!found &&
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xtables_fully_register_pending_match(ptr, prev)) {
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found = true;
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@@ -733,6 +735,11 @@ xtables_find_match(const char *name, enum xtables_tryload tryload,
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dptr = &((*dptr)->next);
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}
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+ if (seen && !found)
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+ fprintf(stderr,
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+ "Warning: Extension %s is not supported, missing kernel module?\n",
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+ name);
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+
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for (ptr = xtables_matches; ptr; ptr = ptr->next) {
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if (extension_cmp(name, ptr->name, ptr->family)) {
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struct xtables_match *clone;
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@@ -825,6 +832,7 @@ xtables_find_target(const char *name, enum xtables_tryload tryload)
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struct xtables_target **dptr;
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struct xtables_target *ptr;
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bool found = false;
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+ bool seen = false;
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/* Standard target? */
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if (strcmp(name, "") == 0
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@@ -843,6 +851,7 @@ xtables_find_target(const char *name, enum xtables_tryload tryload)
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if (extension_cmp(name, (*dptr)->name, (*dptr)->family)) {
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ptr = *dptr;
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*dptr = (*dptr)->next;
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+ seen = true;
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if (!found &&
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xtables_fully_register_pending_target(ptr, prev)) {
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found = true;
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@@ -856,6 +865,11 @@ xtables_find_target(const char *name, enum xtables_tryload tryload)
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dptr = &((*dptr)->next);
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}
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+ if (seen && !found)
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+ fprintf(stderr,
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+ "Warning: Extension %s is not supported, missing kernel module?\n",
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+ name);
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+
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for (ptr = xtables_targets; ptr; ptr = ptr->next) {
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if (extension_cmp(name, ptr->name, ptr->family)) {
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struct xtables_target *clone;
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--
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2.34.1
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