netfilter: arp_tables: simplify translate_compat_table args

commit 8dddd32756f6fe8e4e82a63361119b7e2384e02f upstream.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c
index fa907f24616e69212e8469db0c9be4fbe75aebf6..fc52763830854609359009190766c9fde5eb6c34 100644 (file)
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -1213,6 +1213,18 @@ static int do_add_counters(struct net *net, const void __user *user,
 }
 
 #ifdef CONFIG_COMPAT
+struct compat_arpt_replace {
+       char                            name[XT_TABLE_MAXNAMELEN];
+       u32                             valid_hooks;
+       u32                             num_entries;
+       u32                             size;
+       u32                             hook_entry[NF_ARP_NUMHOOKS];
+       u32                             underflow[NF_ARP_NUMHOOKS];
+       u32                             num_counters;
+       compat_uptr_t                   counters;
+       struct compat_arpt_entry        entries[0];
+};
+
 static inline void compat_release_entry(struct compat_arpt_entry *e)
 {
        struct xt_entry_target *t;
@@ -1228,8 +1240,7 @@ check_compat_entry_size_and_hooks(struct compat_arpt_entry *e,
                                  const unsigned char *base,
                                  const unsigned char *limit,
                                  const unsigned int *hook_entries,
-                                 const unsigned int *underflows,
-                                 const char *name)
+                                 const unsigned int *underflows)
 {
        struct xt_entry_target *t;
        struct xt_target *target;
@@ -1300,7 +1311,7 @@ out:
 
 static int
 compat_copy_entry_from_user(struct compat_arpt_entry *e, void **dstptr,
-                           unsigned int *size, const char *name,
+                           unsigned int *size,
                            struct xt_table_info *newinfo, unsigned char *base)
 {
        struct xt_entry_target *t;
@@ -1333,14 +1344,9 @@ compat_copy_entry_from_user(struct compat_arpt_entry *e, void **dstptr,
        return ret;
 }
 
-static int translate_compat_table(const char *name,
-                                 unsigned int valid_hooks,
-                                 struct xt_table_info **pinfo,
+static int translate_compat_table(struct xt_table_info **pinfo,
                                  void **pentry0,
-                                 unsigned int total_size,
-                                 unsigned int number,
-                                 unsigned int *hook_entries,
-                                 unsigned int *underflows)
+                                 const struct compat_arpt_replace *compatr)
 {
        unsigned int i, j;
        struct xt_table_info *newinfo, *info;
@@ -1352,8 +1358,8 @@ static int translate_compat_table(const char *name,
 
        info = *pinfo;
        entry0 = *pentry0;
-       size = total_size;
-       info->number = number;
+       size = compatr->size;
+       info->number = compatr->num_entries;
 
        /* Init all hooks to impossible value. */
        for (i = 0; i < NF_ARP_NUMHOOKS; i++) {
@@ -1364,40 +1370,39 @@ static int translate_compat_table(const char *name,
        duprintf("translate_compat_table: size %u\n", info->size);
        j = 0;
        xt_compat_lock(NFPROTO_ARP);
-       xt_compat_init_offsets(NFPROTO_ARP, number);
+       xt_compat_init_offsets(NFPROTO_ARP, compatr->num_entries);
        /* Walk through entries, checking offsets. */
-       xt_entry_foreach(iter0, entry0, total_size) {
+       xt_entry_foreach(iter0, entry0, compatr->size) {
                ret = check_compat_entry_size_and_hooks(iter0, info, &size,
                                                        entry0,
-                                                       entry0 + total_size,
-                                                       hook_entries,
-                                                       underflows,
-                                                       name);
+                                                       entry0 + compatr->size,
+                                                       compatr->hook_entry,
+                                                       compatr->underflow);
                if (ret != 0)
                        goto out_unlock;
                ++j;
        }
 
        ret = -EINVAL;
-       if (j != number) {
+       if (j != compatr->num_entries) {
                duprintf("translate_compat_table: %u not %u entries\n",
-                        j, number);
+                        j, compatr->num_entries);
                goto out_unlock;
        }
 
        /* Check hooks all assigned */
        for (i = 0; i < NF_ARP_NUMHOOKS; i++) {
                /* Only hooks which are valid */
-               if (!(valid_hooks & (1 << i)))
+               if (!(compatr->valid_hooks & (1 << i)))
                        continue;
                if (info->hook_entry[i] == 0xFFFFFFFF) {
                        duprintf("Invalid hook entry %u %u\n",
-                                i, hook_entries[i]);
+                                i, info->hook_entry[i]);
                        goto out_unlock;
                }
                if (info->underflow[i] == 0xFFFFFFFF) {
                        duprintf("Invalid underflow %u %u\n",
-                                i, underflows[i]);
+                                i, info->underflow[i]);
                        goto out_unlock;
                }
        }
@@ -1407,17 +1412,17 @@ static int translate_compat_table(const char *name,
        if (!newinfo)
                goto out_unlock;
 
-       newinfo->number = number;
+       newinfo->number = compatr->num_entries;
        for (i = 0; i < NF_ARP_NUMHOOKS; i++) {
                newinfo->hook_entry[i] = info->hook_entry[i];
                newinfo->underflow[i] = info->underflow[i];
        }
        entry1 = newinfo->entries;
        pos = entry1;
-       size = total_size;
-       xt_entry_foreach(iter0, entry0, total_size) {
+       size = compatr->size;
+       xt_entry_foreach(iter0, entry0, compatr->size) {
                ret = compat_copy_entry_from_user(iter0, &pos, &size,
-                                                 name, newinfo, entry1);
+                                                 newinfo, entry1);
                if (ret != 0)
                        break;
        }
@@ -1427,7 +1432,7 @@ static int translate_compat_table(const char *name,
                goto free_newinfo;
 
        ret = -ELOOP;
-       if (!mark_source_chains(newinfo, valid_hooks, entry1))
+       if (!mark_source_chains(newinfo, compatr->valid_hooks, entry1))
                goto free_newinfo;
 
        i = 0;
@@ -1438,7 +1443,7 @@ static int translate_compat_table(const char *name,
                        break;
                }
 
-               ret = check_target(iter1, name);
+               ret = check_target(iter1, compatr->name);
                if (ret != 0) {
                        xt_percpu_counter_free(iter1->counters.pcnt);
                        break;
@@ -1480,7 +1485,7 @@ static int translate_compat_table(const char *name,
 free_newinfo:
        xt_free_table_info(newinfo);
 out:
-       xt_entry_foreach(iter0, entry0, total_size) {
+       xt_entry_foreach(iter0, entry0, compatr->size) {
                if (j-- == 0)
                        break;
                compat_release_entry(iter0);
@@ -1492,18 +1497,6 @@ out_unlock:
        goto out;
 }
 
-struct compat_arpt_replace {
-       char                            name[XT_TABLE_MAXNAMELEN];
-       u32                             valid_hooks;
-       u32                             num_entries;
-       u32                             size;
-       u32                             hook_entry[NF_ARP_NUMHOOKS];
-       u32                             underflow[NF_ARP_NUMHOOKS];
-       u32                             num_counters;
-       compat_uptr_t                   counters;
-       struct compat_arpt_entry        entries[0];
-};
-
 static int compat_do_replace(struct net *net, void __user *user,
                             unsigned int len)
 {
@@ -1536,10 +1529,7 @@ static int compat_do_replace(struct net *net, void __user *user,
                goto free_newinfo;
        }
 
-       ret = translate_compat_table(tmp.name, tmp.valid_hooks,
-                                    &newinfo, &loc_cpu_entry, tmp.size,
-                                    tmp.num_entries, tmp.hook_entry,
-                                    tmp.underflow);
+       ret = translate_compat_table(&newinfo, &loc_cpu_entry, &tmp);
        if (ret != 0)
                goto free_newinfo;