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-rw-r--r--include/uapi/linux/netfilter_bridge/ebtables.h16
-rw-r--r--net/bridge/netfilter/ebtables.c47
2 files changed, 42 insertions, 21 deletions
diff --git a/include/uapi/linux/netfilter_bridge/ebtables.h b/include/uapi/linux/netfilter_bridge/ebtables.h
index 9ff57c0a0199..0c7dc8315013 100644
--- a/include/uapi/linux/netfilter_bridge/ebtables.h
+++ b/include/uapi/linux/netfilter_bridge/ebtables.h
@@ -20,6 +20,7 @@
#define EBT_TABLE_MAXNAMELEN 32
#define EBT_CHAIN_MAXNAMELEN EBT_TABLE_MAXNAMELEN
#define EBT_FUNCTION_MAXNAMELEN EBT_TABLE_MAXNAMELEN
+#define EBT_EXTENSION_MAXNAMELEN 31
/* verdicts >0 are "branches" */
#define EBT_ACCEPT -1
@@ -120,7 +121,10 @@ struct ebt_entries {
struct ebt_entry_match {
union {
- char name[EBT_FUNCTION_MAXNAMELEN];
+ struct {
+ char name[EBT_EXTENSION_MAXNAMELEN];
+ uint8_t revision;
+ };
struct xt_match *match;
} u;
/* size of data */
@@ -130,7 +134,10 @@ struct ebt_entry_match {
struct ebt_entry_watcher {
union {
- char name[EBT_FUNCTION_MAXNAMELEN];
+ struct {
+ char name[EBT_EXTENSION_MAXNAMELEN];
+ uint8_t revision;
+ };
struct xt_target *watcher;
} u;
/* size of data */
@@ -140,7 +147,10 @@ struct ebt_entry_watcher {
struct ebt_entry_target {
union {
- char name[EBT_FUNCTION_MAXNAMELEN];
+ struct {
+ char name[EBT_EXTENSION_MAXNAMELEN];
+ uint8_t revision;
+ };
struct xt_target *target;
} u;
/* size of data */
diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index 9a26d2b7420f..a8cb543e3296 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -356,12 +356,12 @@ ebt_check_match(struct ebt_entry_match *m, struct xt_mtchk_param *par,
left - sizeof(struct ebt_entry_match) < m->match_size)
return -EINVAL;
- match = xt_find_match(NFPROTO_BRIDGE, m->u.name, 0);
+ match = xt_find_match(NFPROTO_BRIDGE, m->u.name, m->u.revision);
if (IS_ERR(match) || match->family != NFPROTO_BRIDGE) {
if (!IS_ERR(match))
module_put(match->me);
request_module("ebt_%s", m->u.name);
- match = xt_find_match(NFPROTO_BRIDGE, m->u.name, 0);
+ match = xt_find_match(NFPROTO_BRIDGE, m->u.name, m->u.revision);
}
if (IS_ERR(match))
return PTR_ERR(match);
@@ -1350,16 +1350,17 @@ static int update_counters(struct net *net, const void __user *user,
static inline int ebt_obj_to_user(char __user *um, const char *_name,
const char *data, int entrysize,
- int usersize, int datasize)
+ int usersize, int datasize, u8 revision)
{
- char name[EBT_FUNCTION_MAXNAMELEN] = {0};
+ char name[EBT_EXTENSION_MAXNAMELEN] = {0};
- /* ebtables expects 32 bytes long names but xt_match names are 29 bytes
+ /* ebtables expects 31 bytes long names but xt_match names are 29 bytes
* long. Copy 29 bytes and fill remaining bytes with zeroes.
*/
strlcpy(name, _name, sizeof(name));
- if (copy_to_user(um, name, EBT_FUNCTION_MAXNAMELEN) ||
- put_user(datasize, (int __user *)(um + EBT_FUNCTION_MAXNAMELEN)) ||
+ if (copy_to_user(um, name, EBT_EXTENSION_MAXNAMELEN) ||
+ put_user(revision, (u8 __user *)(um + EBT_EXTENSION_MAXNAMELEN)) ||
+ put_user(datasize, (int __user *)(um + EBT_EXTENSION_MAXNAMELEN + 1)) ||
xt_data_to_user(um + entrysize, data, usersize, datasize,
XT_ALIGN(datasize)))
return -EFAULT;
@@ -1372,7 +1373,8 @@ static inline int ebt_match_to_user(const struct ebt_entry_match *m,
{
return ebt_obj_to_user(ubase + ((char *)m - base),
m->u.match->name, m->data, sizeof(*m),
- m->u.match->usersize, m->match_size);
+ m->u.match->usersize, m->match_size,
+ m->u.match->revision);
}
static inline int ebt_watcher_to_user(const struct ebt_entry_watcher *w,
@@ -1380,7 +1382,8 @@ static inline int ebt_watcher_to_user(const struct ebt_entry_watcher *w,
{
return ebt_obj_to_user(ubase + ((char *)w - base),
w->u.watcher->name, w->data, sizeof(*w),
- w->u.watcher->usersize, w->watcher_size);
+ w->u.watcher->usersize, w->watcher_size,
+ w->u.watcher->revision);
}
static inline int ebt_entry_to_user(struct ebt_entry *e, const char *base,
@@ -1411,7 +1414,8 @@ static inline int ebt_entry_to_user(struct ebt_entry *e, const char *base,
if (ret != 0)
return ret;
ret = ebt_obj_to_user(hlp, t->u.target->name, t->data, sizeof(*t),
- t->u.target->usersize, t->target_size);
+ t->u.target->usersize, t->target_size,
+ t->u.target->revision);
if (ret != 0)
return ret;
@@ -1599,7 +1603,10 @@ struct compat_ebt_replace {
/* struct ebt_entry_match, _target and _watcher have same layout */
struct compat_ebt_entry_mwt {
union {
- char name[EBT_FUNCTION_MAXNAMELEN];
+ struct {
+ char name[EBT_EXTENSION_MAXNAMELEN];
+ u8 revision;
+ };
compat_uptr_t ptr;
} u;
compat_uint_t match_size;
@@ -1638,8 +1645,9 @@ static int compat_match_to_user(struct ebt_entry_match *m, void __user **dstptr,
BUG_ON(off >= m->match_size);
- if (copy_to_user(cm->u.name, match->name,
- strlen(match->name) + 1) || put_user(msize, &cm->match_size))
+ if (copy_to_user(cm->u.name, match->name, strlen(match->name) + 1) ||
+ put_user(match->revision, &cm->u.revision) ||
+ put_user(msize, &cm->match_size))
return -EFAULT;
if (match->compat_to_user) {
@@ -1668,8 +1676,9 @@ static int compat_target_to_user(struct ebt_entry_target *t,
BUG_ON(off >= t->target_size);
- if (copy_to_user(cm->u.name, target->name,
- strlen(target->name) + 1) || put_user(tsize, &cm->match_size))
+ if (copy_to_user(cm->u.name, target->name, strlen(target->name) + 1) ||
+ put_user(target->revision, &cm->u.revision) ||
+ put_user(tsize, &cm->match_size))
return -EFAULT;
if (target->compat_to_user) {
@@ -1933,7 +1942,7 @@ static int compat_mtw_from_user(struct compat_ebt_entry_mwt *mwt,
struct ebt_entries_buf_state *state,
const unsigned char *base)
{
- char name[EBT_FUNCTION_MAXNAMELEN];
+ char name[EBT_EXTENSION_MAXNAMELEN];
struct xt_match *match;
struct xt_target *wt;
void *dst = NULL;
@@ -1947,7 +1956,8 @@ static int compat_mtw_from_user(struct compat_ebt_entry_mwt *mwt,
switch (compat_mwt) {
case EBT_COMPAT_MATCH:
- match = xt_request_find_match(NFPROTO_BRIDGE, name, 0);
+ match = xt_request_find_match(NFPROTO_BRIDGE, name,
+ mwt->u.revision);
if (IS_ERR(match))
return PTR_ERR(match);
@@ -1966,7 +1976,8 @@ static int compat_mtw_from_user(struct compat_ebt_entry_mwt *mwt,
break;
case EBT_COMPAT_WATCHER: /* fallthrough */
case EBT_COMPAT_TARGET:
- wt = xt_request_find_target(NFPROTO_BRIDGE, name, 0);
+ wt = xt_request_find_target(NFPROTO_BRIDGE, name,
+ mwt->u.revision);
if (IS_ERR(wt))
return PTR_ERR(wt);
off = xt_compat_target_offset(wt);
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