[NETFILTER]: arp_tables: netns preparation

* Propagate netns from userspace.
* arpt_register_table() registers table in supplied netns.

Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/netfilter_arp/arp_tables.h b/include/linux/netfilter_arp/arp_tables.h
index f35486b..db223ca 100644 (file)
--- a/include/linux/netfilter_arp/arp_tables.h
+++ b/include/linux/netfilter_arp/arp_tables.h
@@ -271,7 +271,8 @@ struct arpt_error
        xt_register_target(tgt); })
 #define arpt_unregister_target(tgt) xt_unregister_target(tgt)
 
-extern struct arpt_table *arpt_register_table(struct arpt_table *table,
+extern struct arpt_table *arpt_register_table(struct net *net,
+                                             struct arpt_table *table,
                                              const struct arpt_replace *repl);
 extern void arpt_unregister_table(struct arpt_table *table);
 extern unsigned int arpt_do_table(struct sk_buff *skb,

diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c
index 3a5afb8..ec64b67 100644 (file)
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -22,6 +22,7 @@
 #include <linux/mutex.h>
 #include <linux/err.h>
 #include <net/compat.h>
+#include <net/sock.h>
 #include <asm/uaccess.h>
 
 #include <linux/netfilter/x_tables.h>
@@ -850,7 +851,7 @@ static int compat_table_info(const struct xt_table_info *info,
 }
 #endif
 
-static int get_info(void __user *user, int *len, int compat)
+static int get_info(struct net *net, void __user *user, int *len, int compat)
 {
        char name[ARPT_TABLE_MAXNAMELEN];
        struct arpt_table *t;
@@ -870,7 +871,7 @@ static int get_info(void __user *user, int *len, int compat)
        if (compat)
                xt_compat_lock(NF_ARP);
 #endif
-       t = try_then_request_module(xt_find_table_lock(&init_net, NF_ARP, name),
+       t = try_then_request_module(xt_find_table_lock(net, NF_ARP, name),
                                    "arptable_%s", name);
        if (t && !IS_ERR(t)) {
                struct arpt_getinfo info;
@@ -908,7 +909,8 @@ static int get_info(void __user *user, int *len, int compat)
        return ret;
 }
 
-static int get_entries(struct arpt_get_entries __user *uptr, int *len)
+static int get_entries(struct net *net, struct arpt_get_entries __user *uptr,
+                      int *len)
 {
        int ret;
        struct arpt_get_entries get;
@@ -926,7 +928,7 @@ static int get_entries(struct arpt_get_entries __user *uptr, int *len)
                return -EINVAL;
        }
 
-       t = xt_find_table_lock(&init_net, NF_ARP, get.name);
+       t = xt_find_table_lock(net, NF_ARP, get.name);
        if (t && !IS_ERR(t)) {
                struct xt_table_info *private = t->private;
                duprintf("t->private->number = %u\n",
@@ -947,7 +949,8 @@ static int get_entries(struct arpt_get_entries __user *uptr, int *len)
        return ret;
 }
 
-static int __do_replace(const char *name, unsigned int valid_hooks,
+static int __do_replace(struct net *net, const char *name,
+                       unsigned int valid_hooks,
                        struct xt_table_info *newinfo,
                        unsigned int num_counters,
                        void __user *counters_ptr)
@@ -966,7 +969,7 @@ static int __do_replace(const char *name, unsigned int valid_hooks,
                goto out;
        }
 
-       t = try_then_request_module(xt_find_table_lock(&init_net, NF_ARP, name),
+       t = try_then_request_module(xt_find_table_lock(net, NF_ARP, name),
                                    "arptable_%s", name);
        if (!t || IS_ERR(t)) {
                ret = t ? PTR_ERR(t) : -ENOENT;
@@ -1019,7 +1022,7 @@ static int __do_replace(const char *name, unsigned int valid_hooks,
        return ret;
 }
 
-static int do_replace(void __user *user, unsigned int len)
+static int do_replace(struct net *net, void __user *user, unsigned int len)
 {
        int ret;
        struct arpt_replace tmp;
@@ -1053,7 +1056,7 @@ static int do_replace(void __user *user, unsigned int len)
 
        duprintf("arp_tables: Translated table\n");
 
-       ret = __do_replace(tmp.name, tmp.valid_hooks, newinfo,
+       ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo,
                           tmp.num_counters, tmp.counters);
        if (ret)
                goto free_newinfo_untrans;
@@ -1080,7 +1083,8 @@ static inline int add_counter_to_entry(struct arpt_entry *e,
        return 0;
 }
 
-static int do_add_counters(void __user *user, unsigned int len, int compat)
+static int do_add_counters(struct net *net, void __user *user, unsigned int len,
+                          int compat)
 {
        unsigned int i;
        struct xt_counters_info tmp;
@@ -1132,7 +1136,7 @@ static int do_add_counters(void __user *user, unsigned int len, int compat)
                goto free;
        }
 
-       t = xt_find_table_lock(&init_net, NF_ARP, name);
+       t = xt_find_table_lock(net, NF_ARP, name);
        if (!t || IS_ERR(t)) {
                ret = t ? PTR_ERR(t) : -ENOENT;
                goto free;
@@ -1435,7 +1439,8 @@ struct compat_arpt_replace {
        struct compat_arpt_entry        entries[0];
 };
 
-static int compat_do_replace(void __user *user, unsigned int len)
+static int compat_do_replace(struct net *net, void __user *user,
+                            unsigned int len)
 {
        int ret;
        struct compat_arpt_replace tmp;
@@ -1471,7 +1476,7 @@ static int compat_do_replace(void __user *user, unsigned int len)
 
        duprintf("compat_do_replace: Translated table\n");
 
-       ret = __do_replace(tmp.name, tmp.valid_hooks, newinfo,
+       ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo,
                           tmp.num_counters, compat_ptr(tmp.counters));
        if (ret)
                goto free_newinfo_untrans;
@@ -1494,11 +1499,11 @@ static int compat_do_arpt_set_ctl(struct sock *sk, int cmd, void __user *user,
 
        switch (cmd) {
        case ARPT_SO_SET_REPLACE:
-               ret = compat_do_replace(user, len);
+               ret = compat_do_replace(sk->sk_net, user, len);
                break;
 
        case ARPT_SO_SET_ADD_COUNTERS:
-               ret = do_add_counters(user, len, 1);
+               ret = do_add_counters(sk->sk_net, user, len, 1);
                break;
 
        default:
@@ -1584,7 +1589,8 @@ struct compat_arpt_get_entries {
        struct compat_arpt_entry entrytable[0];
 };
 
-static int compat_get_entries(struct compat_arpt_get_entries __user *uptr,
+static int compat_get_entries(struct net *net,
+                             struct compat_arpt_get_entries __user *uptr,
                              int *len)
 {
        int ret;
@@ -1604,7 +1610,7 @@ static int compat_get_entries(struct compat_arpt_get_entries __user *uptr,
        }
 
        xt_compat_lock(NF_ARP);
-       t = xt_find_table_lock(&init_net, NF_ARP, get.name);
+       t = xt_find_table_lock(net, NF_ARP, get.name);
        if (t && !IS_ERR(t)) {
                struct xt_table_info *private = t->private;
                struct xt_table_info info;
@@ -1641,10 +1647,10 @@ static int compat_do_arpt_get_ctl(struct sock *sk, int cmd, void __user *user,
 
        switch (cmd) {
        case ARPT_SO_GET_INFO:
-               ret = get_info(user, len, 1);
+               ret = get_info(sk->sk_net, user, len, 1);
                break;
        case ARPT_SO_GET_ENTRIES:
-               ret = compat_get_entries(user, len);
+               ret = compat_get_entries(sk->sk_net, user, len);
                break;
        default:
                ret = do_arpt_get_ctl(sk, cmd, user, len);
@@ -1662,11 +1668,11 @@ static int do_arpt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned
 
        switch (cmd) {
        case ARPT_SO_SET_REPLACE:
-               ret = do_replace(user, len);
+               ret = do_replace(sk->sk_net, user, len);
                break;
 
        case ARPT_SO_SET_ADD_COUNTERS:
-               ret = do_add_counters(user, len, 0);
+               ret = do_add_counters(sk->sk_net, user, len, 0);
                break;
 
        default:
@@ -1686,11 +1692,11 @@ static int do_arpt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len
 
        switch (cmd) {
        case ARPT_SO_GET_INFO:
-               ret = get_info(user, len, 0);
+               ret = get_info(sk->sk_net, user, len, 0);
                break;
 
        case ARPT_SO_GET_ENTRIES:
-               ret = get_entries(user, len);
+               ret = get_entries(sk->sk_net, user, len);
                break;
 
        case ARPT_SO_GET_REVISION_TARGET: {
@@ -1719,7 +1725,8 @@ static int do_arpt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len
        return ret;
 }
 
-struct arpt_table *arpt_register_table(struct arpt_table *table,
+struct arpt_table *arpt_register_table(struct net *net,
+                                      struct arpt_table *table,
                                       const struct arpt_replace *repl)
 {
        int ret;
@@ -1749,7 +1756,7 @@ struct arpt_table *arpt_register_table(struct arpt_table *table,
        if (ret != 0)
                goto out_free;
 
-       new_table = xt_register_table(&init_net, table, &bootstrap, newinfo);
+       new_table = xt_register_table(net, table, &bootstrap, newinfo);
        if (IS_ERR(new_table)) {
                ret = PTR_ERR(new_table);
                goto out_free;

diff --git a/net/ipv4/netfilter/arptable_filter.c b/net/ipv4/netfilter/arptable_filter.c
index b003215..1a68860 100644 (file)
--- a/net/ipv4/netfilter/arptable_filter.c
+++ b/net/ipv4/netfilter/arptable_filter.c
@@ -91,7 +91,7 @@ static int __init arptable_filter_init(void)
        int ret;
 
        /* Register table */
-       packet_filter = arpt_register_table(&__packet_filter, &initial_table.repl);
+       packet_filter = arpt_register_table(&init_net, &__packet_filter, &initial_table.repl);
        if (IS_ERR(packet_filter))
                return PTR_ERR(packet_filter);