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Diffstat (limited to 'net/ipv4/netfilter/ip_tables.c')
-rw-r--r--net/ipv4/netfilter/ip_tables.c1138
1 files changed, 1007 insertions, 131 deletions
diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c
index 460fd905fad0..d5b8cdd361ce 100644
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -24,6 +24,7 @@
#include <linux/module.h>
#include <linux/icmp.h>
#include <net/ip.h>
+#include <net/compat.h>
#include <asm/uaccess.h>
#include <linux/mutex.h>
#include <linux/proc_fs.h>
@@ -799,17 +800,11 @@ get_counters(const struct xt_table_info *t,
}
}
-static int
-copy_entries_to_user(unsigned int total_size,
- struct ipt_table *table,
- void __user *userptr)
+static inline struct xt_counters * alloc_counters(struct ipt_table *table)
{
- unsigned int off, num, countersize;
- struct ipt_entry *e;
+ unsigned int countersize;
struct xt_counters *counters;
struct xt_table_info *private = table->private;
- int ret = 0;
- void *loc_cpu_entry;
/* We need atomic snapshot of counters: rest doesn't change
(other than comefrom, which userspace doesn't care
@@ -818,13 +813,32 @@ copy_entries_to_user(unsigned int total_size,
counters = vmalloc_node(countersize, numa_node_id());
if (counters == NULL)
- return -ENOMEM;
+ return ERR_PTR(-ENOMEM);
/* First, sum counters... */
write_lock_bh(&table->lock);
get_counters(private, counters);
write_unlock_bh(&table->lock);
+ return counters;
+}
+
+static int
+copy_entries_to_user(unsigned int total_size,
+ struct ipt_table *table,
+ void __user *userptr)
+{
+ unsigned int off, num;
+ struct ipt_entry *e;
+ struct xt_counters *counters;
+ struct xt_table_info *private = table->private;
+ int ret = 0;
+ void *loc_cpu_entry;
+
+ counters = alloc_counters(table);
+ if (IS_ERR(counters))
+ return PTR_ERR(counters);
+
/* choose the copy that is on our node/cpu, ...
* This choice is lazy (because current thread is
* allowed to migrate to another cpu)
@@ -884,25 +898,278 @@ copy_entries_to_user(unsigned int total_size,
return ret;
}
+#ifdef CONFIG_COMPAT
+struct compat_delta {
+ struct compat_delta *next;
+ u_int16_t offset;
+ short delta;
+};
+
+static struct compat_delta *compat_offsets = NULL;
+
+static int compat_add_offset(u_int16_t offset, short delta)
+{
+ struct compat_delta *tmp;
+
+ tmp = kmalloc(sizeof(struct compat_delta), GFP_KERNEL);
+ if (!tmp)
+ return -ENOMEM;
+ tmp->offset = offset;
+ tmp->delta = delta;
+ if (compat_offsets) {
+ tmp->next = compat_offsets->next;
+ compat_offsets->next = tmp;
+ } else {
+ compat_offsets = tmp;
+ tmp->next = NULL;
+ }
+ return 0;
+}
+
+static void compat_flush_offsets(void)
+{
+ struct compat_delta *tmp, *next;
+
+ if (compat_offsets) {
+ for(tmp = compat_offsets; tmp; tmp = next) {
+ next = tmp->next;
+ kfree(tmp);
+ }
+ compat_offsets = NULL;
+ }
+}
+
+static short compat_calc_jump(u_int16_t offset)
+{
+ struct compat_delta *tmp;
+ short delta;
+
+ for(tmp = compat_offsets, delta = 0; tmp; tmp = tmp->next)
+ if (tmp->offset < offset)
+ delta += tmp->delta;
+ return delta;
+}
+
+struct compat_ipt_standard_target
+{
+ struct compat_xt_entry_target target;
+ compat_int_t verdict;
+};
+
+#define IPT_ST_OFFSET (sizeof(struct ipt_standard_target) - \
+ sizeof(struct compat_ipt_standard_target))
+
+struct compat_ipt_standard
+{
+ struct compat_ipt_entry entry;
+ struct compat_ipt_standard_target target;
+};
+
+static int compat_ipt_standard_fn(void *target,
+ void **dstptr, int *size, int convert)
+{
+ struct compat_ipt_standard_target compat_st, *pcompat_st;
+ struct ipt_standard_target st, *pst;
+ int ret;
+
+ ret = 0;
+ switch (convert) {
+ case COMPAT_TO_USER:
+ pst = (struct ipt_standard_target *)target;
+ memcpy(&compat_st.target, &pst->target,
+ sizeof(struct ipt_entry_target));
+ compat_st.verdict = pst->verdict;
+ if (compat_st.verdict > 0)
+ compat_st.verdict -=
+ compat_calc_jump(compat_st.verdict);
+ compat_st.target.u.user.target_size =
+ sizeof(struct compat_ipt_standard_target);
+ if (__copy_to_user(*dstptr, &compat_st,
+ sizeof(struct compat_ipt_standard_target)))
+ ret = -EFAULT;
+ *size -= IPT_ST_OFFSET;
+ *dstptr += sizeof(struct compat_ipt_standard_target);
+ break;
+ case COMPAT_FROM_USER:
+ pcompat_st =
+ (struct compat_ipt_standard_target *)target;
+ memcpy(&st.target, &pcompat_st->target,
+ sizeof(struct ipt_entry_target));
+ st.verdict = pcompat_st->verdict;
+ if (st.verdict > 0)
+ st.verdict += compat_calc_jump(st.verdict);
+ st.target.u.user.target_size =
+ sizeof(struct ipt_standard_target);
+ memcpy(*dstptr, &st,
+ sizeof(struct ipt_standard_target));
+ *size += IPT_ST_OFFSET;
+ *dstptr += sizeof(struct ipt_standard_target);
+ break;
+ case COMPAT_CALC_SIZE:
+ *size += IPT_ST_OFFSET;
+ break;
+ default:
+ ret = -ENOPROTOOPT;
+ break;
+ }
+ return ret;
+}
+
+static inline int
+compat_calc_match(struct ipt_entry_match *m, int * size)
+{
+ if (m->u.kernel.match->compat)
+ m->u.kernel.match->compat(m, NULL, size, COMPAT_CALC_SIZE);
+ else
+ xt_compat_match(m, NULL, size, COMPAT_CALC_SIZE);
+ return 0;
+}
+
+static int compat_calc_entry(struct ipt_entry *e, struct xt_table_info *info,
+ void *base, struct xt_table_info *newinfo)
+{
+ struct ipt_entry_target *t;
+ u_int16_t entry_offset;
+ int off, i, ret;
+
+ off = 0;
+ entry_offset = (void *)e - base;
+ IPT_MATCH_ITERATE(e, compat_calc_match, &off);
+ t = ipt_get_target(e);
+ if (t->u.kernel.target->compat)
+ t->u.kernel.target->compat(t, NULL, &off, COMPAT_CALC_SIZE);
+ else
+ xt_compat_target(t, NULL, &off, COMPAT_CALC_SIZE);
+ newinfo->size -= off;
+ ret = compat_add_offset(entry_offset, off);
+ if (ret)
+ return ret;
+
+ for (i = 0; i< NF_IP_NUMHOOKS; i++) {
+ if (info->hook_entry[i] && (e < (struct ipt_entry *)
+ (base + info->hook_entry[i])))
+ newinfo->hook_entry[i] -= off;
+ if (info->underflow[i] && (e < (struct ipt_entry *)
+ (base + info->underflow[i])))
+ newinfo->underflow[i] -= off;
+ }
+ return 0;
+}
+
+static int compat_table_info(struct xt_table_info *info,
+ struct xt_table_info *newinfo)
+{
+ void *loc_cpu_entry;
+ int i;
+
+ if (!newinfo || !info)
+ return -EINVAL;
+
+ memset(newinfo, 0, sizeof(struct xt_table_info));
+ newinfo->size = info->size;
+ newinfo->number = info->number;
+ for (i = 0; i < NF_IP_NUMHOOKS; i++) {
+ newinfo->hook_entry[i] = info->hook_entry[i];
+ newinfo->underflow[i] = info->underflow[i];
+ }
+ loc_cpu_entry = info->entries[raw_smp_processor_id()];
+ return IPT_ENTRY_ITERATE(loc_cpu_entry, info->size,
+ compat_calc_entry, info, loc_cpu_entry, newinfo);
+}
+#endif
+
+static int get_info(void __user *user, int *len, int compat)
+{
+ char name[IPT_TABLE_MAXNAMELEN];
+ struct ipt_table *t;
+ int ret;
+
+ if (*len != sizeof(struct ipt_getinfo)) {
+ duprintf("length %u != %u\n", *len,
+ (unsigned int)sizeof(struct ipt_getinfo));
+ return -EINVAL;
+ }
+
+ if (copy_from_user(name, user, sizeof(name)) != 0)
+ return -EFAULT;
+
+ name[IPT_TABLE_MAXNAMELEN-1] = '\0';
+#ifdef CONFIG_COMPAT
+ if (compat)
+ xt_compat_lock(AF_INET);
+#endif
+ t = try_then_request_module(xt_find_table_lock(AF_INET, name),
+ "iptable_%s", name);
+ if (t && !IS_ERR(t)) {
+ struct ipt_getinfo info;
+ struct xt_table_info *private = t->private;
+
+#ifdef CONFIG_COMPAT
+ if (compat) {
+ struct xt_table_info tmp;
+ ret = compat_table_info(private, &tmp);
+ compat_flush_offsets();
+ private = &tmp;
+ }
+#endif
+ info.valid_hooks = t->valid_hooks;
+ memcpy(info.hook_entry, private->hook_entry,
+ sizeof(info.hook_entry));
+ memcpy(info.underflow, private->underflow,
+ sizeof(info.underflow));
+ info.num_entries = private->number;
+ info.size = private->size;
+ strcpy(info.name, name);
+
+ if (copy_to_user(user, &info, *len) != 0)
+ ret = -EFAULT;
+ else
+ ret = 0;
+
+ xt_table_unlock(t);
+ module_put(t->me);
+ } else
+ ret = t ? PTR_ERR(t) : -ENOENT;
+#ifdef CONFIG_COMPAT
+ if (compat)
+ xt_compat_unlock(AF_INET);
+#endif
+ return ret;
+}
+
static int
-get_entries(const struct ipt_get_entries *entries,
- struct ipt_get_entries __user *uptr)
+get_entries(struct ipt_get_entries __user *uptr, int *len)
{
int ret;
+ struct ipt_get_entries get;
struct ipt_table *t;
- t = xt_find_table_lock(AF_INET, entries->name);
+ if (*len < sizeof(get)) {
+ duprintf("get_entries: %u < %d\n", *len,
+ (unsigned int)sizeof(get));
+ return -EINVAL;
+ }
+ if (copy_from_user(&get, uptr, sizeof(get)) != 0)
+ return -EFAULT;
+ if (*len != sizeof(struct ipt_get_entries) + get.size) {
+ duprintf("get_entries: %u != %u\n", *len,
+ (unsigned int)(sizeof(struct ipt_get_entries) +
+ get.size));
+ return -EINVAL;
+ }
+
+ t = xt_find_table_lock(AF_INET, get.name);
if (t && !IS_ERR(t)) {
struct xt_table_info *private = t->private;
duprintf("t->private->number = %u\n",
private->number);
- if (entries->size == private->size)
+ if (get.size == private->size)
ret = copy_entries_to_user(private->size,
t, uptr->entrytable);
else {
duprintf("get_entries: I've got %u not %u!\n",
private->size,
- entries->size);
+ get.size);
ret = -EINVAL;
}
module_put(t->me);
@@ -914,79 +1181,47 @@ get_entries(const struct ipt_get_entries *entries,
}
static int
-do_replace(void __user *user, unsigned int len)
+__do_replace(const char *name, unsigned int valid_hooks,
+ struct xt_table_info *newinfo, unsigned int num_counters,
+ void __user *counters_ptr)
{
int ret;
- struct ipt_replace tmp;
struct ipt_table *t;
- struct xt_table_info *newinfo, *oldinfo;
+ struct xt_table_info *oldinfo;
struct xt_counters *counters;
- void *loc_cpu_entry, *loc_cpu_old_entry;
+ void *loc_cpu_old_entry;
- if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
- return -EFAULT;
-
- /* Hack: Causes ipchains to give correct error msg --RR */
- if (len != sizeof(tmp) + tmp.size)
- return -ENOPROTOOPT;
-
- /* overflow check */
- if (tmp.size >= (INT_MAX - sizeof(struct xt_table_info)) / NR_CPUS -
- SMP_CACHE_BYTES)
- return -ENOMEM;
- if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
- return -ENOMEM;
-
- newinfo = xt_alloc_table_info(tmp.size);
- if (!newinfo)
- return -ENOMEM;
-
- /* choose the copy that is our node/cpu */
- loc_cpu_entry = newinfo->entries[raw_smp_processor_id()];
- if (copy_from_user(loc_cpu_entry, user + sizeof(tmp),
- tmp.size) != 0) {
- ret = -EFAULT;
- goto free_newinfo;
- }
-
- counters = vmalloc(tmp.num_counters * sizeof(struct xt_counters));
+ ret = 0;
+ counters = vmalloc(num_counters * sizeof(struct xt_counters));
if (!counters) {
ret = -ENOMEM;
- goto free_newinfo;
+ goto out;
}
- ret = translate_table(tmp.name, tmp.valid_hooks,
- newinfo, loc_cpu_entry, tmp.size, tmp.num_entries,
- tmp.hook_entry, tmp.underflow);
- if (ret != 0)
- goto free_newinfo_counters;
-
- duprintf("ip_tables: Translated table\n");
-
- t = try_then_request_module(xt_find_table_lock(AF_INET, tmp.name),
- "iptable_%s", tmp.name);
+ t = try_then_request_module(xt_find_table_lock(AF_INET, name),
+ "iptable_%s", name);
if (!t || IS_ERR(t)) {
ret = t ? PTR_ERR(t) : -ENOENT;
goto free_newinfo_counters_untrans;
}
/* You lied! */
- if (tmp.valid_hooks != t->valid_hooks) {
+ if (valid_hooks != t->valid_hooks) {
duprintf("Valid hook crap: %08X vs %08X\n",
- tmp.valid_hooks, t->valid_hooks);
+ valid_hooks, t->valid_hooks);
ret = -EINVAL;
goto put_module;
}
- oldinfo = xt_replace_table(t, tmp.num_counters, newinfo, &ret);
+ oldinfo = xt_replace_table(t, num_counters, newinfo, &ret);
if (!oldinfo)
goto put_module;
/* Update module usage count based on number of rules */
duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n",
oldinfo->number, oldinfo->initial_entries, newinfo->number);
- if ((oldinfo->number > oldinfo->initial_entries) ||
- (newinfo->number <= oldinfo->initial_entries))
+ if ((oldinfo->number > oldinfo->initial_entries) ||
+ (newinfo->number <= oldinfo->initial_entries))
module_put(t->me);
if ((oldinfo->number > oldinfo->initial_entries) &&
(newinfo->number <= oldinfo->initial_entries))
@@ -998,8 +1233,8 @@ do_replace(void __user *user, unsigned int len)
loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()];
IPT_ENTRY_ITERATE(loc_cpu_old_entry, oldinfo->size, cleanup_entry,NULL);
xt_free_table_info(oldinfo);
- if (copy_to_user(tmp.counters, counters,
- sizeof(struct xt_counters) * tmp.num_counters) != 0)
+ if (copy_to_user(counters_ptr, counters,
+ sizeof(struct xt_counters) * num_counters) != 0)
ret = -EFAULT;
vfree(counters);
xt_table_unlock(t);
@@ -1009,9 +1244,62 @@ do_replace(void __user *user, unsigned int len)
module_put(t->me);
xt_table_unlock(t);
free_newinfo_counters_untrans:
- IPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry,NULL);
- free_newinfo_counters:
vfree(counters);
+ out:
+ return ret;
+}
+
+static int
+do_replace(void __user *user, unsigned int len)
+{
+ int ret;
+ struct ipt_replace tmp;
+ struct xt_table_info *newinfo;
+ void *loc_cpu_entry;
+
+ if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
+ return -EFAULT;
+
+ /* Hack: Causes ipchains to give correct error msg --RR */
+ if (len != sizeof(tmp) + tmp.size)
+ return -ENOPROTOOPT;
+
+ /* overflow check */
+ if (tmp.size >= (INT_MAX - sizeof(struct xt_table_info)) / NR_CPUS -
+ SMP_CACHE_BYTES)
+ return -ENOMEM;
+ if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
+ return -ENOMEM;
+
+ newinfo = xt_alloc_table_info(tmp.size);
+ if (!newinfo)
+ return -ENOMEM;
+
+ /* choose the copy that is our node/cpu */
+ loc_cpu_entry = newinfo->entries[raw_smp_processor_id()];
+ if (copy_from_user(loc_cpu_entry, user + sizeof(tmp),
+ tmp.size) != 0) {
+ ret = -EFAULT;
+ goto free_newinfo;
+ }
+
+ ret = translate_table(tmp.name, tmp.valid_hooks,
+ newinfo, loc_cpu_entry, tmp.size, tmp.num_entries,
+ tmp.hook_entry, tmp.underflow);
+ if (ret != 0)
+ goto free_newinfo;
+
+ duprintf("ip_tables: Translated table\n");
+
+ ret = __do_replace(tmp.name, tmp.valid_hooks,
+ newinfo, tmp.num_counters,
+ tmp.counters);
+ if (ret)
+ goto free_newinfo_untrans;
+ return 0;
+
+ free_newinfo_untrans:
+ IPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry,NULL);
free_newinfo:
xt_free_table_info(newinfo);
return ret;
@@ -1040,31 +1328,59 @@ add_counter_to_entry(struct ipt_entry *e,
}
static int
-do_add_counters(void __user *user, unsigned int len)
+do_add_counters(void __user *user, unsigned int len, int compat)
{
unsigned int i;
- struct xt_counters_info tmp, *paddc;
+ struct xt_counters_info tmp;
+ struct xt_counters *paddc;
+ unsigned int num_counters;
+ char *name;
+ int size;
+ void *ptmp;
struct ipt_table *t;
struct xt_table_info *private;
int ret = 0;
void *loc_cpu_entry;
+#ifdef CONFIG_COMPAT
+ struct compat_xt_counters_info compat_tmp;
- if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
+ if (compat) {
+ ptmp = &compat_tmp;
+ size = sizeof(struct compat_xt_counters_info);
+ } else
+#endif
+ {
+ ptmp = &tmp;
+ size = sizeof(struct xt_counters_info);
+ }
+
+ if (copy_from_user(ptmp, user, size) != 0)
return -EFAULT;
- if (len != sizeof(tmp) + tmp.num_counters*sizeof(struct xt_counters))
+#ifdef CONFIG_COMPAT
+ if (compat) {
+ num_counters = compat_tmp.num_counters;
+ name = compat_tmp.name;
+ } else
+#endif
+ {
+ num_counters = tmp.num_counters;
+ name = tmp.name;
+ }
+
+ if (len != size + num_counters * sizeof(struct xt_counters))
return -EINVAL;
- paddc = vmalloc_node(len, numa_node_id());
+ paddc = vmalloc_node(len - size, numa_node_id());
if (!paddc)
return -ENOMEM;
- if (copy_from_user(paddc, user, len) != 0) {
+ if (copy_from_user(paddc, user + size, len - size) != 0) {
ret = -EFAULT;
goto free;
}
- t = xt_find_table_lock(AF_INET, tmp.name);
+ t = xt_find_table_lock(AF_INET, name);
if (!t || IS_ERR(t)) {
ret = t ? PTR_ERR(t) : -ENOENT;
goto free;
@@ -1072,7 +1388,7 @@ do_add_counters(void __user *user, unsigned int len)
write_lock_bh(&t->lock);
private = t->private;
- if (private->number != paddc->num_counters) {
+ if (private->number != num_counters) {
ret = -EINVAL;
goto unlock_up_free;
}
@@ -1083,7 +1399,7 @@ do_add_counters(void __user *user, unsigned int len)
IPT_ENTRY_ITERATE(loc_cpu_entry,
private->size,
add_counter_to_entry,
- paddc->counters,
+ paddc,
&i);
unlock_up_free:
write_unlock_bh(&t->lock);
@@ -1095,8 +1411,438 @@ do_add_counters(void __user *user, unsigned int len)
return ret;
}
+#ifdef CONFIG_COMPAT
+struct compat_ipt_replace {
+ char name[IPT_TABLE_MAXNAMELEN];
+ u32 valid_hooks;
+ u32 num_entries;
+ u32 size;
+ u32 hook_entry[NF_IP_NUMHOOKS];
+ u32 underflow[NF_IP_NUMHOOKS];
+ u32 num_counters;
+ compat_uptr_t counters; /* struct ipt_counters * */
+ struct compat_ipt_entry entries[0];
+};
+
+static inline int compat_copy_match_to_user(struct ipt_entry_match *m,
+ void __user **dstptr, compat_uint_t *size)
+{
+ if (m->u.kernel.match->compat)
+ return m->u.kernel.match->compat(m, dstptr, size,
+ COMPAT_TO_USER);
+ else
+ return xt_compat_match(m, dstptr, size, COMPAT_TO_USER);
+}
+
+static int compat_copy_entry_to_user(struct ipt_entry *e,
+ void __user **dstptr, compat_uint_t *size)
+{
+ struct ipt_entry_target __user *t;
+ struct compat_ipt_entry __user *ce;
+ u_int16_t target_offset, next_offset;
+ compat_uint_t origsize;
+ int ret;
+
+ ret = -EFAULT;
+ origsize = *size;
+ ce = (struct compat_ipt_entry __user *)*dstptr;
+ if (__copy_to_user(ce, e, sizeof(struct ipt_entry)))
+ goto out;
+
+ *dstptr += sizeof(struct compat_ipt_entry);
+ ret = IPT_MATCH_ITERATE(e, compat_copy_match_to_user, dstptr, size);
+ target_offset = e->target_offset - (origsize - *size);
+ if (ret)
+ goto out;
+ t = ipt_get_target(e);
+ if (t->u.kernel.target->compat)
+ ret = t->u.kernel.target->compat(t, dstptr, size,
+ COMPAT_TO_USER);
+ else
+ ret = xt_compat_target(t, dstptr, size, COMPAT_TO_USER);
+ if (ret)
+ goto out;
+ ret = -EFAULT;
+ next_offset = e->next_offset - (origsize - *size);
+ if (__put_user(target_offset, &ce->target_offset))
+ goto out;
+ if (__put_user(next_offset, &ce->next_offset))
+ goto out;
+ return 0;
+out:
+ return ret;
+}
+
+static inline int
+compat_check_calc_match(struct ipt_entry_match *m,
+ const char *name,
+ const struct ipt_ip *ip,
+ unsigned int hookmask,
+ int *size, int *i)
+{
+ struct ipt_match *match;
+
+ match = try_then_request_module(xt_find_match(AF_INET, m->u.user.name,
+ m->u.user.revision),
+ "ipt_%s", m->u.user.name);
+ if (IS_ERR(match) || !match) {
+ duprintf("compat_check_calc_match: `%s' not found\n",
+ m->u.user.name);
+ return match ? PTR_ERR(match) : -ENOENT;
+ }
+ m->u.kernel.match = match;
+
+ if (m->u.kernel.match->compat)
+ m->u.kernel.match->compat(m, NULL, size, COMPAT_CALC_SIZE);
+ else
+ xt_compat_match(m, NULL, size, COMPAT_CALC_SIZE);
+
+ (*i)++;
+ return 0;
+}
+
+static inline int
+check_compat_entry_size_and_hooks(struct ipt_entry *e,
+ struct xt_table_info *newinfo,
+ unsigned int *size,
+ unsigned char *base,
+ unsigned char *limit,
+ unsigned int *hook_entries,
+ unsigned int *underflows,
+ unsigned int *i,
+ const char *name)
+{
+ struct ipt_entry_target *t;
+ struct ipt_target *target;
+ u_int16_t entry_offset;
+ int ret, off, h, j;
+
+ duprintf("check_compat_entry_size_and_hooks %p\n", e);
+ if ((unsigned long)e % __alignof__(struct compat_ipt_entry) != 0
+ || (unsigned char *)e + sizeof(struct compat_ipt_entry) >= limit) {
+ duprintf("Bad offset %p, limit = %p\n", e, limit);
+ return -EINVAL;
+ }
+
+ if (e->next_offset < sizeof(struct compat_ipt_entry) +
+ sizeof(struct compat_xt_entry_target)) {
+ duprintf("checking: element %p size %u\n",
+ e, e->next_offset);
+ return -EINVAL;
+ }
+
+ if (!ip_checkentry(&e->ip)) {
+ duprintf("ip_tables: ip check failed %p %s.\n", e, name);
+ return -EINVAL;
+ }
+
+ off = 0;
+ entry_offset = (void *)e - (void *)base;
+ j = 0;
+ ret = IPT_MATCH_ITERATE(e, compat_check_calc_match, name, &e->ip,
+ e->comefrom, &off, &j);
+ if (ret != 0)
+ goto out;
+
+ t = ipt_get_target(e);
+ target = try_then_request_module(xt_find_target(AF_INET,
+ t->u.user.name,
+ t->u.user.revision),
+ "ipt_%s", t->u.user.name);
+ if (IS_ERR(target) || !target) {
+ duprintf("check_entry: `%s' not found\n", t->u.user.name);
+ ret = target ? PTR_ERR(target) : -ENOENT;
+ goto out;
+ }
+ t->u.kernel.target = target;
+
+ if (t->u.kernel.target->compat)
+ t->u.kernel.target->compat(t, NULL, &off, COMPAT_CALC_SIZE);
+ else
+ xt_compat_target(t, NULL, &off, COMPAT_CALC_SIZE);
+ *size += off;
+ ret = compat_add_offset(entry_offset, off);
+ if (ret)
+ goto out;
+
+ /* Check hooks & underflows */
+ for (h = 0; h < NF_IP_NUMHOOKS; h++) {
+ if ((unsigned char *)e - base == hook_entries[h])
+ newinfo->hook_entry[h] = hook_entries[h];
+ if ((unsigned char *)e - base == underflows[h])
+ newinfo->underflow[h] = underflows[h];
+ }
+
+ /* Clear counters and comefrom */
+ e->counters = ((struct ipt_counters) { 0, 0 });
+ e->comefrom = 0;
+
+ (*i)++;
+ return 0;
+out:
+ IPT_MATCH_ITERATE(e, cleanup_match, &j);
+ return ret;
+}
+
+static inline int compat_copy_match_from_user(struct ipt_entry_match *m,
+ void **dstptr, compat_uint_t *size, const char *name,
+ const struct ipt_ip *ip, unsigned int hookmask)
+{
+ struct ipt_entry_match *dm;
+ struct ipt_match *match;
+ int ret;
+
+ dm = (struct ipt_entry_match *)*dstptr;
+ match = m->u.kernel.match;
+ if (match->compat)
+ match->compat(m, dstptr, size, COMPAT_FROM_USER);
+ else
+ xt_compat_match(m, dstptr, size, COMPAT_FROM_USER);
+
+ ret = xt_check_match(match, AF_INET, dm->u.match_size - sizeof(*dm),
+ name, hookmask, ip->proto,
+ ip->invflags & IPT_INV_PROTO);
+ if (ret)
+ return ret;
+
+ if (m->u.kernel.match->checkentry
+ && !m->u.kernel.match->checkentry(name, ip, match, dm->data,
+ dm->u.match_size - sizeof(*dm),
+ hookmask)) {
+ duprintf("ip_tables: check failed for `%s'.\n",
+ m->u.kernel.match->name);
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int compat_copy_entry_from_user(struct ipt_entry *e, void **dstptr,
+ unsigned int *size, const char *name,
+ struct xt_table_info *newinfo, unsigned char *base)
+{
+ struct ipt_entry_target *t;
+ struct ipt_target *target;
+ struct ipt_entry *de;
+ unsigned int origsize;
+ int ret, h;
+
+ ret = 0;
+ origsize = *size;
+ de = (struct ipt_entry *)*dstptr;
+ memcpy(de, e, sizeof(struct ipt_entry));
+
+ *dstptr += sizeof(struct compat_ipt_entry);
+ ret = IPT_MATCH_ITERATE(e, compat_copy_match_from_user, dstptr, size,
+ name, &de->ip, de->comefrom);
+ if (ret)
+ goto out;
+ de->target_offset = e->target_offset - (origsize - *size);
+ t = ipt_get_target(e);
+ target = t->u.kernel.target;
+ if (target->compat)
+ target->compat(t, dstptr, size, COMPAT_FROM_USER);
+ else
+ xt_compat_target(t, dstptr, size, COMPAT_FROM_USER);
+
+ de->next_offset = e->next_offset - (origsize - *size);
+ for (h = 0; h < NF_IP_NUMHOOKS; h++) {
+ if ((unsigned char *)de - base < newinfo->hook_entry[h])
+ newinfo->hook_entry[h] -= origsize - *size;
+ if ((unsigned char *)de - base < newinfo->underflow[h])
+ newinfo->underflow[h] -= origsize - *size;
+ }
+
+ t = ipt_get_target(de);
+ 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)
+ goto out;
+
+ ret = -EINVAL;
+ if (t->u.kernel.target == &ipt_standard_target) {
+ if (!standard_check(t, *size))
+ goto out;
+ } else if (t->u.kernel.target->checkentry
+ && !t->u.kernel.target->checkentry(name, de, target,
+ t->data, t->u.target_size - sizeof(*t),
+ de->comefrom)) {
+ duprintf("ip_tables: compat: check failed for `%s'.\n",
+ t->u.kernel.target->name);
+ goto out;
+ }
+ ret = 0;
+out:
+ return ret;
+}
+
static int
-do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
+translate_compat_table(const char *name,
+ unsigned int valid_hooks,
+ struct xt_table_info **pinfo,
+ void **pentry0,
+ unsigned int total_size,
+ unsigned int number,
+ unsigned int *hook_entries,
+ unsigned int *underflows)
+{
+ unsigned int i;
+ struct xt_table_info *newinfo, *info;
+ void *pos, *entry0, *entry1;
+ unsigned int size;
+ int ret;
+
+ info = *pinfo;
+ entry0 = *pentry0;
+ size = total_size;
+ info->number = number;
+
+ /* Init all hooks to impossible value. */
+ for (i = 0; i < NF_IP_NUMHOOKS; i++) {
+ info->hook_entry[i] = 0xFFFFFFFF;
+ info->underflow[i] = 0xFFFFFFFF;
+ }
+
+ duprintf("translate_compat_table: size %u\n", info->size);
+ i = 0;
+ xt_compat_lock(AF_INET);
+ /* Walk through entries, checking offsets. */
+ ret = IPT_ENTRY_ITERATE(entry0, total_size,
+ check_compat_entry_size_and_hooks,
+ info, &size, entry0,
+ entry0 + total_size,
+ hook_entries, underflows, &i, name);
+ if (ret != 0)
+ goto out_unlock;
+
+ ret = -EINVAL;
+ if (i != number) {
+ duprintf("translate_compat_table: %u not %u entries\n",
+ i, number);
+ goto out_unlock;
+ }
+
+ /* Check hooks all assigned */
+ for (i = 0; i < NF_IP_NUMHOOKS; i++) {
+ /* Only hooks which are valid */
+ if (!(valid_hooks & (1 << i)))
+ continue;
+ if (info->hook_entry[i] == 0xFFFFFFFF) {
+ duprintf("Invalid hook entry %u %u\n",
+ i, hook_entries[i]);
+ goto out_unlock;
+ }
+ if (info->underflow[i] == 0xFFFFFFFF) {
+ duprintf("Invalid underflow %u %u\n",
+ i, underflows[i]);
+ goto out_unlock;
+ }
+ }
+
+ ret = -ENOMEM;
+ newinfo = xt_alloc_table_info(size);
+ if (!newinfo)
+ goto out_unlock;
+
+ newinfo->number = number;
+ for (i = 0; i < NF_IP_NUMHOOKS; i++) {
+ newinfo->hook_entry[i] = info->hook_entry[i];
+ newinfo->underflow[i] = info->underflow[i];
+ }
+ entry1 = newinfo->entries[raw_smp_processor_id()];
+ pos = entry1;
+ size = total_size;
+ ret = IPT_ENTRY_ITERATE(entry0, total_size,
+ compat_copy_entry_from_user, &pos, &size,
+ name, newinfo, entry1);
+ compat_flush_offsets();
+ xt_compat_unlock(AF_INET);
+ if (ret)
+ goto free_newinfo;
+
+ ret = -ELOOP;
+ if (!mark_source_chains(newinfo, valid_hooks, entry1))
+ goto free_newinfo;
+
+ /* And one copy for every other CPU */
+ for_each_cpu(i)
+ if (newinfo->entries[i] && newinfo->entries[i] != entry1)
+ memcpy(newinfo->entries[i], entry1, newinfo->size);
+
+ *pinfo = newinfo;
+ *pentry0 = entry1;
+ xt_free_table_info(info);
+ return 0;
+
+free_newinfo:
+ xt_free_table_info(newinfo);
+out:
+ return ret;
+out_unlock:
+ xt_compat_unlock(AF_INET);
+ goto out;
+}
+
+static int
+compat_do_replace(void __user *user, unsigned int len)
+{
+ int ret;
+ struct compat_ipt_replace tmp;
+ struct xt_table_info *newinfo;
+ void *loc_cpu_entry;
+
+ if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
+ return -EFAULT;
+
+ /* Hack: Causes ipchains to give correct error msg --RR */
+ if (len != sizeof(tmp) + tmp.size)
+ return -ENOPROTOOPT;
+
+ /* overflow check */
+ if (tmp.size >= (INT_MAX - sizeof(struct xt_table_info)) / NR_CPUS -
+ SMP_CACHE_BYTES)
+ return -ENOMEM;
+ if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
+ return -ENOMEM;
+
+ newinfo = xt_alloc_table_info(tmp.size);
+ if (!newinfo)
+ return -ENOMEM;
+
+ /* choose the copy that is our node/cpu */
+ loc_cpu_entry = newinfo->entries[raw_smp_processor_id()];
+ if (copy_from_user(loc_cpu_entry, user + sizeof(tmp),
+ tmp.size) != 0) {
+ ret = -EFAULT;
+ 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);
+ if (ret != 0)
+ goto free_newinfo;
+
+ duprintf("compat_do_replace: Translated table\n");
+
+ ret = __do_replace(tmp.name, tmp.valid_hooks,
+ newinfo, tmp.num_counters,
+ compat_ptr(tmp.counters));
+ if (ret)
+ goto free_newinfo_untrans;
+ return 0;
+
+ free_newinfo_untrans:
+ IPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry,NULL);
+ free_newinfo:
+ xt_free_table_info(newinfo);
+ return ret;
+}
+
+static int
+compat_do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user,
+ unsigned int len)
{
int ret;
@@ -1105,11 +1851,11 @@ do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
switch (cmd) {
case IPT_SO_SET_REPLACE:
- ret = do_replace(user, len);
+ ret = compat_do_replace(user, len);
break;
case IPT_SO_SET_ADD_COUNTERS:
- ret = do_add_counters(user, len);
+ ret = do_add_counters(user, len, 1);
break;
default:
@@ -1120,75 +1866,196 @@ do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
return ret;
}
+struct compat_ipt_get_entries
+{
+ char name[IPT_TABLE_MAXNAMELEN];
+ compat_uint_t size;
+ struct compat_ipt_entry entrytable[0];
+};
+
+static int compat_copy_entries_to_user(unsigned int total_size,
+ struct ipt_table *table, void __user *userptr)
+{
+ unsigned int off, num;
+ struct compat_ipt_entry e;
+ struct xt_counters *counters;
+ struct xt_table_info *private = table->private;
+ void __user *pos;
+ unsigned int size;
+ int ret = 0;
+ void *loc_cpu_entry;
+
+ counters = alloc_counters(table);
+ if (IS_ERR(counters))
+ return PTR_ERR(counters);
+
+ /* choose the copy that is on our node/cpu, ...
+ * This choice is lazy (because current thread is
+ * allowed to migrate to another cpu)
+ */
+ loc_cpu_entry = private->entries[raw_smp_processor_id()];
+ pos = userptr;
+ size = total_size;
+ ret = IPT_ENTRY_ITERATE(loc_cpu_entry, total_size,
+ compat_copy_entry_to_user, &pos, &size);
+ if (ret)
+ goto free_counters;
+
+ /* ... then go back and fix counters and names */
+ for (off = 0, num = 0; off < size; off += e.next_offset, num++) {
+ unsigned int i;
+ struct ipt_entry_match m;
+ struct ipt_entry_target t;
+
+ ret = -EFAULT;
+ if (copy_from_user(&e, userptr + off,
+ sizeof(struct compat_ipt_entry)))
+ goto free_counters;
+ if (copy_to_user(userptr + off +
+ offsetof(struct compat_ipt_entry, counters),
+ &counters[num], sizeof(counters[num])))
+ goto free_counters;
+
+ for (i = sizeof(struct compat_ipt_entry);
+ i < e.target_offset; i += m.u.match_size) {
+ if (copy_from_user(&m, userptr + off + i,
+ sizeof(struct ipt_entry_match)))
+ goto free_counters;
+ if (copy_to_user(userptr + off + i +
+ offsetof(struct ipt_entry_match, u.user.name),
+ m.u.kernel.match->name,
+ strlen(m.u.kernel.match->name) + 1))
+ goto free_counters;
+ }
+
+ if (copy_from_user(&t, userptr + off + e.target_offset,
+ sizeof(struct ipt_entry_target)))
+ goto free_counters;
+ if (copy_to_user(userptr + off + e.target_offset +
+ offsetof(struct ipt_entry_target, u.user.name),
+ t.u.kernel.target->name,
+ strlen(t.u.kernel.target->name) + 1))
+ goto free_counters;
+ }
+ ret = 0;
+free_counters:
+ vfree(counters);
+ return ret;
+}
+
static int
-do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
+compat_get_entries(struct compat_ipt_get_entries __user *uptr, int *len)
{
int ret;
+ struct compat_ipt_get_entries get;
+ struct ipt_table *t;
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
- switch (cmd) {
- case IPT_SO_GET_INFO: {
- char name[IPT_TABLE_MAXNAMELEN];
- struct ipt_table *t;
+ if (*len < sizeof(get)) {
+ duprintf("compat_get_entries: %u < %u\n",
+ *len, (unsigned int)sizeof(get));
+ return -EINVAL;
+ }
+
+ if (copy_from_user(&get, uptr, sizeof(get)) != 0)
+ return -EFAULT;
+
+ if (*len != sizeof(struct compat_ipt_get_entries) + get.size) {
+ duprintf("compat_get_entries: %u != %u\n", *len,
+ (unsigned int)(sizeof(struct compat_ipt_get_entries) +
+ get.size));
+ return -EINVAL;
+ }
- if (*len != sizeof(struct ipt_getinfo)) {
- duprintf("length %u != %u\n", *len,
- sizeof(struct ipt_getinfo));
+ xt_compat_lock(AF_INET);
+ t = xt_find_table_lock(AF_INET, get.name);
+ if (t && !IS_ERR(t)) {
+ struct xt_table_info *private = t->private;
+ struct xt_table_info info;
+ duprintf("t->private->number = %u\n",
+ private->number);
+ ret = compat_table_info(private, &info);
+ if (!ret && get.size == info.size) {
+ ret = compat_copy_entries_to_user(private->size,
+ t, uptr->entrytable);
+ } else if (!ret) {
+ duprintf("compat_get_entries: I've got %u not %u!\n",
+ private->size,
+ get.size);
ret = -EINVAL;
- break;
}
+ compat_flush_offsets();
+ module_put(t->me);
+ xt_table_unlock(t);
+ } else
+ ret = t ? PTR_ERR(t) : -ENOENT;
- if (copy_from_user(name, user, sizeof(name)) != 0) {
- ret = -EFAULT;
- break;
- }
- name[IPT_TABLE_MAXNAMELEN-1] = '\0';
-
- t = try_then_request_module(xt_find_table_lock(AF_INET, name),
- "iptable_%s", name);
- if (t && !IS_ERR(t)) {
- struct ipt_getinfo info;
- struct xt_table_info *private = t->private;
-
- info.valid_hooks = t->valid_hooks;
- memcpy(info.hook_entry, private->hook_entry,
- sizeof(info.hook_entry));
- memcpy(info.underflow, private->underflow,
- sizeof(info.underflow));
- info.num_entries = private->number;
- info.size = private->size;
- memcpy(info.name, name, sizeof(info.name));
-
- if (copy_to_user(user, &info, *len) != 0)
- ret = -EFAULT;
- else
- ret = 0;
- xt_table_unlock(t);
- module_put(t->me);
- } else
- ret = t ? PTR_ERR(t) : -ENOENT;
+ xt_compat_unlock(AF_INET);
+ return ret;
+}
+
+static int
+compat_do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
+{
+ int ret;
+
+ switch (cmd) {
+ case IPT_SO_GET_INFO:
+ ret = get_info(user, len, 1);
+ break;
+ case IPT_SO_GET_ENTRIES:
+ ret = compat_get_entries(user, len);
+ break;
+ default:
+ duprintf("compat_do_ipt_get_ctl: unknown request %i\n", cmd);
+ ret = -EINVAL;
}
- break;
+ return ret;
+}
+#endif
- case IPT_SO_GET_ENTRIES: {
- struct ipt_get_entries get;
+static int
+do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
+{
+ int ret;
- if (*len < sizeof(get)) {
- duprintf("get_entries: %u < %u\n", *len, sizeof(get));
- ret = -EINVAL;
- } else if (copy_from_user(&get, user, sizeof(get)) != 0) {
- ret = -EFAULT;
- } else if (*len != sizeof(struct ipt_get_entries) + get.size) {
- duprintf("get_entries: %u != %u\n", *len,
- sizeof(struct ipt_get_entries) + get.size);
- ret = -EINVAL;
- } else
- ret = get_entries(&get, user);
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+
+ switch (cmd) {
+ case IPT_SO_SET_REPLACE:
+ ret = do_replace(user, len);
break;
+
+ case IPT_SO_SET_ADD_COUNTERS:
+ ret = do_add_counters(user, len, 0);
+ break;
+
+ default:
+ duprintf("do_ipt_set_ctl: unknown request %i\n", cmd);
+ ret = -EINVAL;
}
+ return ret;
+}
+
+static int
+do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
+{
+ int ret;
+
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+
+ switch (cmd) {
+ case IPT_SO_GET_INFO:
+ ret = get_info(user, len, 0);
+ break;
+
+ case IPT_SO_GET_ENTRIES:
+ ret = get_entries(user, len);
+ break;
+
case IPT_SO_GET_REVISION_MATCH:
case IPT_SO_GET_REVISION_TARGET: {
struct ipt_get_revision rev;
@@ -1336,6 +2203,9 @@ static struct ipt_target ipt_standard_target = {
.name = IPT_STANDARD_TARGET,
.targetsize = sizeof(int),
.family = AF_INET,
+#ifdef CONFIG_COMPAT
+ .compat = &compat_ipt_standard_fn,
+#endif
};
static struct ipt_target ipt_error_target = {
@@ -1350,9 +2220,15 @@ static struct nf_sockopt_ops ipt_sockopts = {
.set_optmin = IPT_BASE_CTL,
.set_optmax = IPT_SO_SET_MAX+1,
.set = do_ipt_set_ctl,
+#ifdef CONFIG_COMPAT
+ .compat_set = compat_do_ipt_set_ctl,
+#endif
.get_optmin = IPT_BASE_CTL,
.get_optmax = IPT_SO_GET_MAX+1,
.get = do_ipt_get_ctl,
+#ifdef CONFIG_COMPAT
+ .compat_get = compat_do_ipt_get_ctl,
+#endif
};
static struct ipt_match icmp_matchstruct = {

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