Updating iptables from 1.4.x to 1.6.x brokes rules print/save output
and causes rules load after reboot to fail. Here is example from
iptables-save(8) output after update:
-A CHAIN1 -m set [unsupported revision] -j DROP
-A CHAIN1 -m set [unsupported revision] -j DROP
Similar output could be obtained via iptables -L CHAIN1. While issue
reproduced with xt_set match it is not specific to any match or
target module: it is related on how xtables handles revisions.
In this particular case we have following situation:
1) Kernel supports revisions from 1 to 4.
2) Rules configured with iptables 1.4.x supporting only
revisions from 1 to 3. Choosen highest possible revision 3.
3) Rules printed/saved with iptables 1.6.x supporting revisions
from 1 to 4.
4) Xtables registers matches/targets with highest supported
revision by the kernel. This is 4 in our case after update to
iptables 1.6.x.
5) When printing/saving kernel submits match/target with revision
it is configured (3), while iptables thinks that rules configured
with highest supported (4). That's causes revision mismatch in
during print and "[unsupported revision]" output.
To fix this issue we now store all supported by kernel and xtables
revisions in xt_matches/xt_targets list sorted in descending order.
Introduce helper routines to find match/target with given revision
and use them to find right revision to print submitted by kernel
entry.
Signed-off-by: Serhey Popovych <serhe.popovych@xxxxxxxxx>
---
include/xtables.h | 6 +++++
iptables/ip6tables.c | 66 ++++++++++++++++++++++++++++++++------------------
iptables/iptables.c | 66 ++++++++++++++++++++++++++++++++------------------
libxtables/xtables.c | 42 ++++++++++++++++++++++++++++++++
4 files changed, 134 insertions(+), 46 deletions(-)
diff --git a/include/xtables.h b/include/xtables.h
index e9bc3b7..0b19e0f 100644
--- a/include/xtables.h
+++ b/include/xtables.h
@@ -464,8 +464,14 @@ extern struct option *xtables_merge_options(struct option *origopts,
extern int xtables_init_all(struct xtables_globals *xtp, uint8_t nfproto);
extern struct xtables_match *xtables_find_match(const char *name,
enum xtables_tryload, struct xtables_rule_match **match);
+extern struct xtables_match *xtables_find_match_revision(const char *name,
+ enum xtables_tryload tryload, struct xtables_match *match,
+ int revision);
extern struct xtables_target *xtables_find_target(const char *name,
enum xtables_tryload);
+struct xtables_target *xtables_find_target_revision(const char *name,
+ enum xtables_tryload tryload, struct xtables_target *target,
+ int revision);
extern int xtables_compatible_revision(const char *name, uint8_t revision,
int opt);
diff --git a/iptables/ip6tables.c b/iptables/ip6tables.c
index 49bd006..6954c25 100644
--- a/iptables/ip6tables.c
+++ b/iptables/ip6tables.c
@@ -518,19 +518,23 @@ print_match(const struct xt_entry_match *m,
const struct ip6t_ip6 *ip,
int numeric)
{
- const struct xtables_match *match =
- xtables_find_match(m->u.user.name, XTF_TRY_LOAD, NULL);
+ const char *name = m->u.user.name;
+ const int revision = m->u.user.revision;
+ struct xtables_match *match, *mt;
+ match = xtables_find_match(name, XTF_TRY_LOAD, NULL);
if (match) {
- if (match->print && m->u.user.revision == match->revision)
- match->print(ip, m, numeric);
+ mt = xtables_find_match_revision(name, XTF_TRY_LOAD,
+ match, revision);
+ if (mt && mt->print)
+ mt->print(ip, m, numeric);
else if (match->print)
printf("%s%s ", match->name, unsupported_rev);
else
printf("%s ", match->name);
} else {
- if (m->u.user.name[0])
- printf("UNKNOWN match `%s' ", m->u.user.name);
+ if (name[0])
+ printf("UNKNOWN match `%s' ", name);
}
/* Don't stop iterating. */
return 0;
@@ -544,7 +548,7 @@ print_firewall(const struct ip6t_entry *fw,
unsigned int format,
struct xtc_handle *const handle)
{
- const struct xtables_target *target = NULL;
+ struct xtables_target *target, *tg;
const struct xt_entry_target *t;
char buf[BUFSIZ];
@@ -651,9 +655,13 @@ print_firewall(const struct ip6t_entry *fw,
IP6T_MATCH_ITERATE(fw, print_match, &fw->ipv6, format & FMT_NUMERIC);
if (target) {
- if (target->print && t->u.user.revision == target->revision)
+ const int revision = t->u.user.revision;
+
+ tg = xtables_find_target_revision(targname, XTF_TRY_LOAD,
+ target, revision);
+ if (tg && tg->print)
/* Print the target information. */
- target->print(&fw->ipv6, t, format & FMT_NUMERIC);
+ tg->print(&fw->ipv6, t, format & FMT_NUMERIC);
else if (target->print)
printf(" %s%s", target->name, unsupported_rev);
} else if (t->u.target_size != sizeof(*t))
@@ -1035,23 +1043,28 @@ static void print_proto(uint16_t proto, int invert)
static int print_match_save(const struct xt_entry_match *e,
const struct ip6t_ip6 *ip)
{
- const struct xtables_match *match =
- xtables_find_match(e->u.user.name, XTF_TRY_LOAD, NULL);
+ const char *name = e->u.user.name;
+ const int revision = e->u.user.revision;
+ struct xtables_match *match, *mt, *mt2;
+ match = xtables_find_match(name, XTF_TRY_LOAD, NULL);
if (match) {
- printf(" -m %s",
- match->alias ? match->alias(e) : e->u.user.name);
+ mt = mt2 = xtables_find_match_revision(name, XTF_TRY_LOAD,
+ match, revision);
+ if (!mt2)
+ mt2 = match;
+ printf(" -m %s", mt2->alias ? mt2->alias(e) : name);
/* some matches don't provide a save function */
- if (match->save && e->u.user.revision == match->revision)
- match->save(ip, e);
+ if (mt && mt->save)
+ mt->save(ip, e);
else if (match->save)
printf(unsupported_rev);
} else {
if (e->u.match_size) {
fprintf(stderr,
"Can't find library for match `%s'\n",
- e->u.user.name);
+ name);
exit(1);
}
}
@@ -1136,18 +1149,25 @@ void print_rule6(const struct ip6t_entry *e,
target_name = ip6tc_get_target(e, h);
t = ip6t_get_target((struct ip6t_entry *)e);
if (t->u.user.name[0]) {
- struct xtables_target *target =
- xtables_find_target(t->u.user.name, XTF_TRY_LOAD);
+ const char *name = t->u.user.name;
+ const int revision = t->u.user.revision;
+ struct xtables_target *target, *tg, *tg2;
+ target = xtables_find_target(name, XTF_TRY_LOAD);
if (!target) {
fprintf(stderr, "Can't find library for target `%s'\n",
- t->u.user.name);
+ name);
exit(1);
}
- printf(" -j %s", target->alias ? target->alias(t) : target_name);
- if (target->save && t->u.user.revision == target->revision)
- target->save(&e->ipv6, t);
+ tg = tg2 = xtables_find_target_revision(name, XTF_TRY_LOAD,
+ target, revision);
+ if (!tg2)
+ tg2 = target;
+ printf(" -j %s", tg2->alias ? tg2->alias(t) : target_name);
+
+ if (tg && tg->save)
+ tg->save(&e->ipv6, t);
else if (target->save)
printf(unsupported_rev);
else {
@@ -1158,7 +1178,7 @@ void print_rule6(const struct ip6t_entry *e,
sizeof(struct xt_entry_target)) {
fprintf(stderr, "Target `%s' is missing "
"save function\n",
- t->u.user.name);
+ name);
exit(1);
}
}
diff --git a/iptables/iptables.c b/iptables/iptables.c
index 69d19fe..acacf18 100644
--- a/iptables/iptables.c
+++ b/iptables/iptables.c
@@ -502,19 +502,23 @@ print_match(const struct xt_entry_match *m,
const struct ipt_ip *ip,
int numeric)
{
- const struct xtables_match *match =
- xtables_find_match(m->u.user.name, XTF_TRY_LOAD, NULL);
+ const char *name = m->u.user.name;
+ const int revision = m->u.user.revision;
+ struct xtables_match *match, *mt;
+ match = xtables_find_match(name, XTF_TRY_LOAD, NULL);
if (match) {
- if (match->print && m->u.user.revision == match->revision)
- match->print(ip, m, numeric);
+ mt = xtables_find_match_revision(name, XTF_TRY_LOAD,
+ match, revision);
+ if (mt && mt->print)
+ mt->print(ip, m, numeric);
else if (match->print)
printf("%s%s ", match->name, unsupported_rev);
else
printf("%s ", match->name);
} else {
- if (m->u.user.name[0])
- printf("UNKNOWN match `%s' ", m->u.user.name);
+ if (name[0])
+ printf("UNKNOWN match `%s' ", name);
}
/* Don't stop iterating. */
return 0;
@@ -528,7 +532,7 @@ print_firewall(const struct ipt_entry *fw,
unsigned int format,
struct xtc_handle *const handle)
{
- const struct xtables_target *target = NULL;
+ struct xtables_target *target, *tg;
const struct xt_entry_target *t;
uint8_t flags;
char buf[BUFSIZ];
@@ -635,9 +639,13 @@ print_firewall(const struct ipt_entry *fw,
IPT_MATCH_ITERATE(fw, print_match, &fw->ip, format & FMT_NUMERIC);
if (target) {
- if (target->print && t->u.user.revision == target->revision)
+ const int revision = t->u.user.revision;
+
+ tg = xtables_find_target_revision(targname, XTF_TRY_LOAD,
+ target, revision);
+ if (tg && tg->print)
/* Print the target information. */
- target->print(&fw->ip, t, format & FMT_NUMERIC);
+ tg->print(&fw->ip, t, format & FMT_NUMERIC);
else if (target->print)
printf(" %s%s", target->name, unsupported_rev);
} else if (t->u.target_size != sizeof(*t))
@@ -1025,23 +1033,28 @@ print_iface(char letter, const char *iface, const unsigned char *mask,
static int print_match_save(const struct xt_entry_match *e,
const struct ipt_ip *ip)
{
- const struct xtables_match *match =
- xtables_find_match(e->u.user.name, XTF_TRY_LOAD, NULL);
+ const char *name = e->u.user.name;
+ const int revision = e->u.user.revision;
+ struct xtables_match *match, *mt, *mt2;
+ match = xtables_find_match(name, XTF_TRY_LOAD, NULL);
if (match) {
- printf(" -m %s",
- match->alias ? match->alias(e) : e->u.user.name);
+ mt = mt2 = xtables_find_match_revision(name, XTF_TRY_LOAD,
+ match, revision);
+ if (!mt2)
+ mt2 = match;
+ printf(" -m %s", mt2->alias ? mt2->alias(e) : name);
/* some matches don't provide a save function */
- if (match->save && e->u.user.revision == match->revision)
- match->save(ip, e);
+ if (mt && mt->save)
+ mt->save(ip, e);
else if (match->save)
printf(unsupported_rev);
} else {
if (e->u.match_size) {
fprintf(stderr,
"Can't find library for match `%s'\n",
- e->u.user.name);
+ name);
exit(1);
}
}
@@ -1125,18 +1138,25 @@ void print_rule4(const struct ipt_entry *e,
target_name = iptc_get_target(e, h);
t = ipt_get_target((struct ipt_entry *)e);
if (t->u.user.name[0]) {
- const struct xtables_target *target =
- xtables_find_target(t->u.user.name, XTF_TRY_LOAD);
+ const char *name = t->u.user.name;
+ const int revision = t->u.user.revision;
+ struct xtables_target *target, *tg, *tg2;
+ target = xtables_find_target(name, XTF_TRY_LOAD);
if (!target) {
fprintf(stderr, "Can't find library for target `%s'\n",
- t->u.user.name);
+ name);
exit(1);
}
- printf(" -j %s", target->alias ? target->alias(t) : target_name);
- if (target->save && t->u.user.revision == target->revision)
- target->save(&e->ip, t);
+ tg = tg2 = xtables_find_target_revision(name, XTF_TRY_LOAD,
+ target, revision);
+ if (!tg2)
+ tg2 = target;
+ printf(" -j %s", tg2->alias ? tg2->alias(t) : target_name);
+
+ if (tg && tg->save)
+ tg->save(&e->ip, t);
else if (target->save)
printf(unsupported_rev);
else {
@@ -1147,7 +1167,7 @@ void print_rule4(const struct ipt_entry *e,
sizeof(struct xt_entry_target)) {
fprintf(stderr, "Target `%s' is missing "
"save function\n",
- t->u.user.name);
+ name);
exit(1);
}
}
diff --git a/libxtables/xtables.c b/libxtables/xtables.c
index 5a115ff..06044a2 100644
--- a/libxtables/xtables.c
+++ b/libxtables/xtables.c
@@ -709,6 +709,27 @@ xtables_find_match(const char *name, enum xtables_tryload tryload,
return ptr;
}
+struct xtables_match *
+xtables_find_match_revision(const char *name, enum xtables_tryload tryload,
+ struct xtables_match *match, int revision)
+{
+ if (!match) {
+ match = xtables_find_match(name, tryload, NULL);
+ if (!match)
+ return NULL;
+ }
+
+ while (1) {
+ if (match->revision == revision)
+ return match;
+ match = match->next;
+ if (!match)
+ return NULL;
+ if (!extension_cmp(name, match->name, match->family))
+ return NULL;
+ }
+}
+
struct xtables_target *
xtables_find_target(const char *name, enum xtables_tryload tryload)
{
@@ -769,6 +790,27 @@ xtables_find_target(const char *name, enum xtables_tryload tryload)
return ptr;
}
+struct xtables_target *
+xtables_find_target_revision(const char *name, enum xtables_tryload tryload,
+ struct xtables_target *target, int revision)
+{
+ if (!target) {
+ target = xtables_find_target(name, tryload);
+ if (!target)
+ return NULL;
+ }
+
+ while (1) {
+ if (target->revision == revision)
+ return target;
+ target = target->next;
+ if (!target)
+ return NULL;
+ if (!extension_cmp(name, target->name, target->family))
+ return NULL;
+ }
+}
+
int xtables_compatible_revision(const char *name, uint8_t revision, int opt)
{
struct xt_get_revision rev;
--
1.7.10.4
--
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