netfilter: xtables: do centralized checkentry call (1/2)

It used to be that {ip,ip6,etc}_tables called extension->checkentry
themselves, but this can be moved into the xtables core.

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>

diff --git a/include/linux/netfilter/x_tables.h b/include/linux/netfilter/x_tables.h
index 6989b22..85aa427 100644 (file)
--- a/include/linux/netfilter/x_tables.h
+++ b/include/linux/netfilter/x_tables.h
@@ -330,10 +330,12 @@ extern void xt_unregister_matches(struct xt_match *match, unsigned int n);
 
 extern int xt_check_match(const struct xt_match *match, unsigned short family,
                          unsigned int size, const char *table, unsigned int hook,
-                         unsigned short proto, int inv_proto);
+                         unsigned short proto, int inv_proto,
+                         const void *entry, void *matchinfo);
 extern int xt_check_target(const struct xt_target *target, unsigned short family,
                           unsigned int size, const char *table, unsigned int hook,
-                          unsigned short proto, int inv_proto);
+                          unsigned short proto, int inv_proto,
+                          const void *entry, void *targinfo);
 
 extern struct xt_table *xt_register_table(struct net *net,
                                          struct xt_table *table,

diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index 7d8ead5..7ee72b7 100644 (file)
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -340,15 +340,11 @@ ebt_check_match(struct ebt_entry_match *m, struct ebt_entry *e,
        m->u.match = match;
 
        ret = xt_check_match(match, NFPROTO_BRIDGE, m->match_size,
-             name, hookmask, e->ethproto, e->invflags & EBT_IPROTO);
+             name, hookmask, e->ethproto, e->invflags & EBT_IPROTO,
+             e, m->data);
        if (ret < 0) {
                module_put(match->me);
                return ret;
-       } else if (match->checkentry != NULL &&
-           !match->checkentry(name, e, NULL, m->data, hookmask)) {
-               module_put(match->me);
-               BUGPRINT("match->check failed\n");
-               return -EINVAL;
        }
 
        (*cnt)++;
@@ -377,15 +373,11 @@ ebt_check_watcher(struct ebt_entry_watcher *w, struct ebt_entry *e,
        w->u.watcher = watcher;
 
        ret = xt_check_target(watcher, NFPROTO_BRIDGE, w->watcher_size,
-             name, hookmask, e->ethproto, e->invflags & EBT_IPROTO);
+             name, hookmask, e->ethproto, e->invflags & EBT_IPROTO,
+             e, w->data);
        if (ret < 0) {
                module_put(watcher->me);
                return ret;
-       } else if (watcher->checkentry != NULL &&
-           !watcher->checkentry(name, e, NULL, w->data, hookmask)) {
-               module_put(watcher->me);
-               BUGPRINT("watcher->check failed\n");
-               return -EINVAL;
        }
 
        (*cnt)++;
@@ -692,15 +684,11 @@ ebt_check_entry(struct ebt_entry *e, struct ebt_table_info *newinfo,
        }
 
        ret = xt_check_target(target, NFPROTO_BRIDGE, t->target_size,
-             name, hookmask, e->ethproto, e->invflags & EBT_IPROTO);
+             name, hookmask, e->ethproto, e->invflags & EBT_IPROTO,
+             e, t->data);
        if (ret < 0) {
                module_put(target->me);
                goto cleanup_watchers;
-       } else if (t->u.target->checkentry &&
-           !t->u.target->checkentry(name, e, NULL, t->data, hookmask)) {
-               module_put(t->u.target->me);
-               ret = -EINVAL;
-               goto cleanup_watchers;
        }
        (*cnt)++;
        return 0;

diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c
index b4a9a17..ae525a9 100644 (file)
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -465,15 +465,13 @@ static inline int check_target(struct arpt_entry *e, const char *name)
 
        ret = xt_check_target(target, NFPROTO_ARP,
                              t->u.target_size - sizeof(*t),
-                             name, e->comefrom, 0, 0);
-       if (!ret && t->u.kernel.target->checkentry
-           && !t->u.kernel.target->checkentry(name, e, target, t->data,
-                                              e->comefrom)) {
+                             name, e->comefrom, 0, 0, e, t->data);
+       if (ret < 0) {
                duprintf("arp_tables: check failed for `%s'.\n",
                         t->u.kernel.target->name);
-               ret = -EINVAL;
+               return ret;
        }
-       return ret;
+       return 0;
 }
 
 static inline int

diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c
index 4e7c719..b4c74a7 100644 (file)
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -616,17 +616,14 @@ check_match(struct ipt_entry_match *m, const char *name,
        match = m->u.kernel.match;
        ret = xt_check_match(match, AF_INET, m->u.match_size - sizeof(*m),
                             name, hookmask, ip->proto,
-                            ip->invflags & IPT_INV_PROTO);
-       if (!ret && m->u.kernel.match->checkentry
-           && !m->u.kernel.match->checkentry(name, ip, match, m->data,
-                                             hookmask)) {
+                            ip->invflags & IPT_INV_PROTO, ip, m->data);
+       if (ret < 0) {
                duprintf("ip_tables: check failed for `%s'.\n",
                         m->u.kernel.match->name);
-               ret = -EINVAL;
+               return ret;
        }
-       if (!ret)
-               (*i)++;
-       return ret;
+       ++*i;
+       return 0;
 }
 
 static int
@@ -668,15 +665,13 @@ static int check_target(struct ipt_entry *e, const char *name)
        target = t->u.kernel.target;
        ret = xt_check_target(target, AF_INET, t->u.target_size - sizeof(*t),
                              name, e->comefrom, e->ip.proto,
-                             e->ip.invflags & IPT_INV_PROTO);
-       if (!ret && t->u.kernel.target->checkentry
-           && !t->u.kernel.target->checkentry(name, e, target, t->data,
-                                              e->comefrom)) {
+                             e->ip.invflags & IPT_INV_PROTO, e, t->data);
+       if (ret < 0) {
                duprintf("ip_tables: check failed for `%s'.\n",
                         t->u.kernel.target->name);
-               ret = -EINVAL;
+               return ret;
        }
-       return ret;
+       return 0;
 }
 
 static int

diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c
index 0b4557e..12c41b8 100644 (file)
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -642,17 +642,14 @@ static int check_match(struct ip6t_entry_match *m, const char *name,
        match = m->u.kernel.match;
        ret = xt_check_match(match, AF_INET6, m->u.match_size - sizeof(*m),
                             name, hookmask, ipv6->proto,
-                            ipv6->invflags & IP6T_INV_PROTO);
-       if (!ret && m->u.kernel.match->checkentry
-           && !m->u.kernel.match->checkentry(name, ipv6, match, m->data,
-                                             hookmask)) {
+                            ipv6->invflags & IP6T_INV_PROTO, ipv6, m->data);
+       if (ret < 0) {
                duprintf("ip_tables: check failed for `%s'.\n",
                         m->u.kernel.match->name);
-               ret = -EINVAL;
+               return ret;
        }
-       if (!ret)
-               (*i)++;
-       return ret;
+       ++*i;
+       return 0;
 }
 
 static int
@@ -694,15 +691,13 @@ static int check_target(struct ip6t_entry *e, const char *name)
        target = t->u.kernel.target;
        ret = xt_check_target(target, AF_INET6, t->u.target_size - sizeof(*t),
                              name, e->comefrom, e->ipv6.proto,
-                             e->ipv6.invflags & IP6T_INV_PROTO);
-       if (!ret && t->u.kernel.target->checkentry
-           && !t->u.kernel.target->checkentry(name, e, target, t->data,
-                                              e->comefrom)) {
+                             e->ipv6.invflags & IP6T_INV_PROTO, e, t->data);
+       if (ret < 0) {
                duprintf("ip_tables: check failed for `%s'.\n",
                         t->u.kernel.target->name);
-               ret = -EINVAL;
+               return ret;
        }
-       return ret;
+       return 0;
 }
 
 static int

diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c
index 3b1fc40..d1f2fb3 100644 (file)
--- a/net/netfilter/x_tables.c
+++ b/net/netfilter/x_tables.c
@@ -323,7 +323,8 @@ EXPORT_SYMBOL_GPL(xt_find_revision);
 
 int xt_check_match(const struct xt_match *match, unsigned short family,
                   unsigned int size, const char *table, unsigned int hook_mask,
-                  unsigned short proto, int inv_proto)
+                  unsigned short proto, int inv_proto, const void *entry,
+                  void *matchinfo)
 {
        if (XT_ALIGN(match->matchsize) != size &&
            match->matchsize != -1) {
@@ -351,6 +352,9 @@ int xt_check_match(const struct xt_match *match, unsigned short family,
                       xt_prefix[family], match->name, match->proto);
                return -EINVAL;
        }
+       if (match->checkentry != NULL &&
+           !match->checkentry(table, entry, match, matchinfo, hook_mask))
+               return -EINVAL;
        return 0;
 }
 EXPORT_SYMBOL_GPL(xt_check_match);
@@ -469,7 +473,8 @@ EXPORT_SYMBOL_GPL(xt_compat_match_to_user);
 
 int xt_check_target(const struct xt_target *target, unsigned short family,
                    unsigned int size, const char *table, unsigned int hook_mask,
-                   unsigned short proto, int inv_proto)
+                   unsigned short proto, int inv_proto, const void *entry,
+                   void *targinfo)
 {
        if (XT_ALIGN(target->targetsize) != size) {
                printk("%s_tables: %s target: invalid size %Zu != %u\n",
@@ -493,6 +498,9 @@ int xt_check_target(const struct xt_target *target, unsigned short family,
                       xt_prefix[family], target->name, target->proto);
                return -EINVAL;
        }
+       if (target->checkentry != NULL &&
+           !target->checkentry(table, entry, target, targinfo, hook_mask))
+               return -EINVAL;
        return 0;
 }
 EXPORT_SYMBOL_GPL(xt_check_target);

diff --git a/net/sched/act_ipt.c b/net/sched/act_ipt.c
index d1263b3..79ea193 100644 (file)
--- a/net/sched/act_ipt.c
+++ b/net/sched/act_ipt.c
@@ -51,20 +51,12 @@ static int ipt_init_target(struct ipt_entry_target *t, char *table, unsigned int
        t->u.kernel.target = target;
 
        ret = xt_check_target(target, AF_INET, t->u.target_size - sizeof(*t),
-                             table, hook, 0, 0);
-       if (ret) {
+                             table, hook, 0, 0, NULL, t->data);
+       if (ret < 0) {
                module_put(t->u.kernel.target->me);
                return ret;
        }
-       if (t->u.kernel.target->checkentry
-           && !t->u.kernel.target->checkentry(table, NULL,
-                                              t->u.kernel.target, t->data,
-                                              hook)) {
-               module_put(t->u.kernel.target->me);
-               ret = -EINVAL;
-       }
-
-       return ret;
+       return 0;
 }
 
 static void ipt_destroy_target(struct ipt_entry_target *t)