Some extensions are not supported in revision 0 by user space anymore,
for those the warning in xtables_compatible_revision() does not print as
no revision 0 is tried.
To fix this, one has to track if none of the user space supported
revisions were accepted by the kernel. Therefore add respective logic to
xtables_find_{target,match}().
Note that this does not lead to duplicated warnings for unsupported
extensions that have a revision 0 because xtables_compatible_revision()
returns true for them to allow for extension's help output.
For the record, these ip6tables extensions are affected: set/SET,
socket, tos/TOS, TPROXY and SNAT. In addition to that, TEE is affected
for both families.
Fixes: 17534cb18ed0a ("Improve error messages for unsupported extensions")
Signed-off-by: Phil Sutter <phil@xxxxxx>
---
libxtables/xtables.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/libxtables/xtables.c b/libxtables/xtables.c
index dc645162973f0..479dbae078156 100644
--- a/libxtables/xtables.c
+++ b/libxtables/xtables.c
@@ -776,6 +776,7 @@ xtables_find_match(const char *name, enum xtables_tryload tryload,
struct xtables_match *ptr;
const char *icmp6 = "icmp6";
bool found = false;
+ bool seen = false;
if (strlen(name) >= XT_EXTENSION_MAXNAMELEN)
xtables_error(PARAMETER_PROBLEM,
@@ -794,6 +795,7 @@ xtables_find_match(const char *name, enum xtables_tryload tryload,
if (extension_cmp(name, (*dptr)->name, (*dptr)->family)) {
ptr = *dptr;
*dptr = (*dptr)->next;
+ seen = true;
if (!found &&
xtables_fully_register_pending_match(ptr, prev)) {
found = true;
@@ -807,6 +809,11 @@ xtables_find_match(const char *name, enum xtables_tryload tryload,
dptr = &((*dptr)->next);
}
+ if (seen && !found)
+ fprintf(stderr,
+ "Warning: Extension %s is not supported, missing kernel module?\n",
+ name);
+
for (ptr = xtables_matches; ptr; ptr = ptr->next) {
if (extension_cmp(name, ptr->name, ptr->family)) {
struct xtables_match *clone;
@@ -899,6 +906,7 @@ xtables_find_target(const char *name, enum xtables_tryload tryload)
struct xtables_target **dptr;
struct xtables_target *ptr;
bool found = false;
+ bool seen = false;
/* Standard target? */
if (strcmp(name, "") == 0
@@ -917,6 +925,7 @@ xtables_find_target(const char *name, enum xtables_tryload tryload)
if (extension_cmp(name, (*dptr)->name, (*dptr)->family)) {
ptr = *dptr;
*dptr = (*dptr)->next;
+ seen = true;
if (!found &&
xtables_fully_register_pending_target(ptr, prev)) {
found = true;
@@ -930,6 +939,11 @@ xtables_find_target(const char *name, enum xtables_tryload tryload)
dptr = &((*dptr)->next);
}
+ if (seen && !found)
+ fprintf(stderr,
+ "Warning: Extension %s is not supported, missing kernel module?\n",
+ name);
+
for (ptr = xtables_targets; ptr; ptr = ptr->next) {
if (extension_cmp(name, ptr->name, ptr->family)) {
struct xtables_target *clone;
--
2.34.1
