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[NETFILTER]: ip6_tables: add compat support

Browse source 
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2007-12-17 21:50:37 -08:00 • committed by David S. Miller
parent d924357c50
commit 3bc3fe5eed
3 changed files with 819 additions and 179 deletions
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35
include/linux/netfilter_ipv6/ip6_tables.h
View file

@ -326,5 +326,40 @@ extern int ip6_masked_addrcmp(const struct in6_addr *addr1,
#define IP6T_ALIGN(s) (((s) + (__alignof__(struct ip6t_entry)-1)) & ~(__alignof__(struct ip6t_entry)-1)) #define IP6T_ALIGN(s) (((s) + (__alignof__(struct ip6t_entry)-1)) & ~(__alignof__(struct ip6t_entry)-1))
#ifdef CONFIG_COMPAT
#include <net/compat.h>
struct compat_ip6t_entry
{
struct ip6t_ip6 ipv6;
compat_uint_t nfcache;
u_int16_t target_offset;
u_int16_t next_offset;
compat_uint_t comefrom;
struct compat_xt_counters counters;
unsigned char elems[0];
};
static inline struct ip6t_entry_target *
compat_ip6t_get_target(struct compat_ip6t_entry *e)
{
return (void *)e + e->target_offset;
}
#define COMPAT_IP6T_ALIGN(s) COMPAT_XT_ALIGN(s)
/* fn returns 0 to continue iteration */
#define COMPAT_IP6T_MATCH_ITERATE(e, fn, args...) \
XT_MATCH_ITERATE(struct compat_ip6t_entry, e, fn, ## args)
/* fn returns 0 to continue iteration */
#define COMPAT_IP6T_ENTRY_ITERATE(entries, size, fn, args...) \
XT_ENTRY_ITERATE(struct compat_ip6t_entry, entries, size, fn, ## args)
#define COMPAT_IP6T_ENTRY_ITERATE_CONTINUE(entries, size, n, fn, args...) \
XT_ENTRY_ITERATE_CONTINUE(struct compat_ip6t_entry, entries, size, n, \
fn, ## args)
#endif /* CONFIG_COMPAT */
#endif /*__KERNEL__*/ #endif /*__KERNEL__*/
#endif /* _IP6_TABLES_H */ #endif /* _IP6_TABLES_H */

106
net/compat.c
View file

@ -20,7 +20,6 @@
#include <linux/syscalls.h> #include <linux/syscalls.h>
#include <linux/filter.h> #include <linux/filter.h>
#include <linux/compat.h> #include <linux/compat.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/security.h> #include <linux/security.h>
#include <net/scm.h> #include <net/scm.h>
@ -316,107 +315,6 @@ void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
__scm_destroy(scm); __scm_destroy(scm);
} }
/*
* For now, we assume that the compatibility and native version
* of struct ipt_entry are the same - sfr. FIXME
*/
struct compat_ipt_replace {
char name[IPT_TABLE_MAXNAMELEN];
u32 valid_hooks;
u32 num_entries;
u32 size;
u32 hook_entry[NF_INET_NUMHOOKS];
u32 underflow[NF_INET_NUMHOOKS];
u32 num_counters;
compat_uptr_t counters; /* struct ipt_counters * */
struct ipt_entry entries[0];
};
static int do_netfilter_replace(int fd, int level, int optname,
char __user *optval, int optlen)
{
struct compat_ipt_replace __user *urepl;
struct ipt_replace __user *repl_nat;
char name[IPT_TABLE_MAXNAMELEN];
u32 origsize, tmp32, num_counters;
unsigned int repl_nat_size;
int ret;
int i;
compat_uptr_t ucntrs;
urepl = (struct compat_ipt_replace __user *)optval;
if (get_user(origsize, &urepl->size))
return -EFAULT;
/* Hack: Causes ipchains to give correct error msg --RR */
if (optlen != sizeof(*urepl) + origsize)
return -ENOPROTOOPT;
/* XXX Assumes that size of ipt_entry is the same both in
* native and compat environments.
*/
repl_nat_size = sizeof(*repl_nat) + origsize;
repl_nat = compat_alloc_user_space(repl_nat_size);
ret = -EFAULT;
if (put_user(origsize, &repl_nat->size))
goto out;
if (!access_ok(VERIFY_READ, urepl, optlen) ||
!access_ok(VERIFY_WRITE, repl_nat, optlen))
goto out;
if (__copy_from_user(name, urepl->name, sizeof(urepl->name)) ||
__copy_to_user(repl_nat->name, name, sizeof(repl_nat->name)))
goto out;
if (__get_user(tmp32, &urepl->valid_hooks) ||
__put_user(tmp32, &repl_nat->valid_hooks))
goto out;
if (__get_user(tmp32, &urepl->num_entries) ||
__put_user(tmp32, &repl_nat->num_entries))
goto out;
if (__get_user(num_counters, &urepl->num_counters) ||
__put_user(num_counters, &repl_nat->num_counters))
goto out;
if (__get_user(ucntrs, &urepl->counters) ||
__put_user(compat_ptr(ucntrs), &repl_nat->counters))
goto out;
if (__copy_in_user(&repl_nat->entries[0],
&urepl->entries[0],
origsize))
goto out;
for (i = 0; i < NF_INET_NUMHOOKS; i++) {
if (__get_user(tmp32, &urepl->hook_entry[i]) ||
__put_user(tmp32, &repl_nat->hook_entry[i]) ||
__get_user(tmp32, &urepl->underflow[i]) ||
__put_user(tmp32, &repl_nat->underflow[i]))
goto out;
}
/*
* Since struct ipt_counters just contains two u_int64_t members
* we can just do the access_ok check here and pass the (converted)
* pointer into the standard syscall. We hope that the pointer is
* not misaligned ...
*/
if (!access_ok(VERIFY_WRITE, compat_ptr(ucntrs),
num_counters * sizeof(struct ipt_counters)))
goto out;
ret = sys_setsockopt(fd, level, optname,
(char __user *)repl_nat, repl_nat_size);
out:
return ret;
}
/* /*
* A struct sock_filter is architecture independent. * A struct sock_filter is architecture independent.
*/ */
@ -485,10 +383,6 @@ asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
int err; int err;
struct socket *sock; struct socket *sock;
if (level == SOL_IPV6 && optname == IPT_SO_SET_REPLACE)
return do_netfilter_replace(fd, level, optname,
optval, optlen);
if (optlen < 0) if (optlen < 0)
return -EINVAL; return -EINVAL;

857
net/ipv6/netfilter/ip6_tables.c
View file

@ -19,9 +19,11 @@
#include <linux/poison.h> #include <linux/poison.h>
#include <linux/icmpv6.h> #include <linux/icmpv6.h>
#include <net/ipv6.h> #include <net/ipv6.h>
#include <net/compat.h>
#include <asm/uaccess.h> #include <asm/uaccess.h>
#include <linux/mutex.h> #include <linux/mutex.h>
#include <linux/proc_fs.h> #include <linux/proc_fs.h>
#include <linux/err.h>
#include <linux/cpumask.h> #include <linux/cpumask.h>
#include <linux/netfilter_ipv6/ip6_tables.h> #include <linux/netfilter_ipv6/ip6_tables.h>
@ -1037,7 +1039,80 @@ copy_entries_to_user(unsigned int total_size,
return ret; return ret;
} }
static int get_info(void __user *user, int *len) #ifdef CONFIG_COMPAT
static void compat_standard_from_user(void *dst, void *src)
{
int v = *(compat_int_t *)src;
if (v > 0)
v += xt_compat_calc_jump(AF_INET6, v);
memcpy(dst, &v, sizeof(v));
}
static int compat_standard_to_user(void __user *dst, void *src)
{
compat_int_t cv = *(int *)src;
if (cv > 0)
cv -= xt_compat_calc_jump(AF_INET6, cv);
return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0;
}
static inline int
compat_calc_match(struct ip6t_entry_match *m, int *size)
{
*size += xt_compat_match_offset(m->u.kernel.match);
return 0;
}
static int compat_calc_entry(struct ip6t_entry *e,
const struct xt_table_info *info,
void *base, struct xt_table_info *newinfo)
{
struct ip6t_entry_target *t;
unsigned int entry_offset;
int off, i, ret;
off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
entry_offset = (void *)e - base;
IP6T_MATCH_ITERATE(e, compat_calc_match, &off);
t = ip6t_get_target(e);
off += xt_compat_target_offset(t->u.kernel.target);
newinfo->size -= off;
ret = xt_compat_add_offset(AF_INET6, entry_offset, off);
if (ret)
return ret;
for (i = 0; i < NF_INET_NUMHOOKS; i++) {
if (info->hook_entry[i] &&
(e < (struct ip6t_entry *)(base + info->hook_entry[i])))
newinfo->hook_entry[i] -= off;
if (info->underflow[i] &&
(e < (struct ip6t_entry *)(base + info->underflow[i])))
newinfo->underflow[i] -= off;
}
return 0;
}
static int compat_table_info(const struct xt_table_info *info,
struct xt_table_info *newinfo)
{
void *loc_cpu_entry;
if (!newinfo || !info)
return -EINVAL;
/* we dont care about newinfo->entries[] */
memcpy(newinfo, info, offsetof(struct xt_table_info, entries));
newinfo->initial_entries = 0;
loc_cpu_entry = info->entries[raw_smp_processor_id()];
return IP6T_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[IP6T_TABLE_MAXNAMELEN]; char name[IP6T_TABLE_MAXNAMELEN];
struct xt_table *t; struct xt_table *t;
@ -1053,13 +1128,24 @@ static int get_info(void __user *user, int *len)
return -EFAULT; return -EFAULT;
name[IP6T_TABLE_MAXNAMELEN-1] = '\0'; name[IP6T_TABLE_MAXNAMELEN-1] = '\0';
#ifdef CONFIG_COMPAT
if (compat)
xt_compat_lock(AF_INET6);
#endif
t = try_then_request_module(xt_find_table_lock(AF_INET6, name), t = try_then_request_module(xt_find_table_lock(AF_INET6, name),
"ip6table_%s", name); "ip6table_%s", name);
if (t && !IS_ERR(t)) { if (t && !IS_ERR(t)) {
struct ip6t_getinfo info; struct ip6t_getinfo info;
struct xt_table_info *private = t->private; struct xt_table_info *private = t->private;
#ifdef CONFIG_COMPAT
if (compat) {
struct xt_table_info tmp;
ret = compat_table_info(private, &tmp);
xt_compat_flush_offsets(AF_INET6);
private = &tmp;
}
#endif
info.valid_hooks = t->valid_hooks; info.valid_hooks = t->valid_hooks;
memcpy(info.hook_entry, private->hook_entry, memcpy(info.hook_entry, private->hook_entry,
sizeof(info.hook_entry)); sizeof(info.hook_entry));
@ -1078,6 +1164,10 @@ static int get_info(void __user *user, int *len)
module_put(t->me); module_put(t->me);
} else } else
ret = t ? PTR_ERR(t) : -ENOENT; ret = t ? PTR_ERR(t) : -ENOENT;
#ifdef CONFIG_COMPAT
if (compat)
xt_compat_unlock(AF_INET6);
#endif
return ret; return ret;
} }
@ -1120,15 +1210,84 @@ get_entries(struct ip6t_get_entries __user *uptr, int *len)
return ret; return ret;
} }
static int
__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 xt_table *t;
struct xt_table_info *oldinfo;
struct xt_counters *counters;
void *loc_cpu_old_entry;
ret = 0;
counters = vmalloc_node(num_counters * sizeof(struct xt_counters),
numa_node_id());
if (!counters) {
ret = -ENOMEM;
goto out;
}
t = try_then_request_module(xt_find_table_lock(AF_INET6, name),
"ip6table_%s", name);
if (!t || IS_ERR(t)) {
ret = t ? PTR_ERR(t) : -ENOENT;
goto free_newinfo_counters_untrans;
}
/* You lied! */
if (valid_hooks != t->valid_hooks) {
duprintf("Valid hook crap: %08X vs %08X\n",
valid_hooks, t->valid_hooks);
ret = -EINVAL;
goto put_module;
}
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))
module_put(t->me);
if ((oldinfo->number > oldinfo->initial_entries) &&
(newinfo->number <= oldinfo->initial_entries))
module_put(t->me);
/* Get the old counters. */
get_counters(oldinfo, counters);
/* Decrease module usage counts and free resource */
loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()];
IP6T_ENTRY_ITERATE(loc_cpu_old_entry, oldinfo->size, cleanup_entry,
NULL);
xt_free_table_info(oldinfo);
if (copy_to_user(counters_ptr, counters,
sizeof(struct xt_counters) * num_counters) != 0)
ret = -EFAULT;
vfree(counters);
xt_table_unlock(t);
return ret;
put_module:
module_put(t->me);
xt_table_unlock(t);
free_newinfo_counters_untrans:
vfree(counters);
out:
return ret;
}
static int static int
do_replace(void __user *user, unsigned int len) do_replace(void __user *user, unsigned int len)
{ {
int ret; int ret;
struct ip6t_replace tmp; struct ip6t_replace tmp;
struct xt_table *t; struct xt_table_info *newinfo;
struct xt_table_info *newinfo, *oldinfo; void *loc_cpu_entry;
struct xt_counters *counters;
void *loc_cpu_entry, *loc_cpu_old_entry;
if (copy_from_user(&tmp, user, sizeof(tmp)) != 0) if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
return -EFAULT; return -EFAULT;
@ -1149,70 +1308,22 @@ do_replace(void __user *user, unsigned int len)
goto free_newinfo; goto free_newinfo;
} }
counters = vmalloc_node(tmp.num_counters * sizeof(struct xt_counters),
numa_node_id());
if (!counters) {
ret = -ENOMEM;
goto free_newinfo;
}
ret = translate_table(tmp.name, tmp.valid_hooks, ret = translate_table(tmp.name, tmp.valid_hooks,
newinfo, loc_cpu_entry, tmp.size, tmp.num_entries, newinfo, loc_cpu_entry, tmp.size, tmp.num_entries,
tmp.hook_entry, tmp.underflow); tmp.hook_entry, tmp.underflow);
if (ret != 0) if (ret != 0)
goto free_newinfo_counters; goto free_newinfo;
duprintf("ip_tables: Translated table\n"); duprintf("ip_tables: Translated table\n");
t = try_then_request_module(xt_find_table_lock(AF_INET6, tmp.name), ret = __do_replace(tmp.name, tmp.valid_hooks, newinfo,
"ip6table_%s", tmp.name); tmp.num_counters, tmp.counters);
if (!t || IS_ERR(t)) { if (ret)
ret = t ? PTR_ERR(t) : -ENOENT; goto free_newinfo_untrans;
goto free_newinfo_counters_untrans; return 0;
}
/* You lied! */ free_newinfo_untrans:
if (tmp.valid_hooks != t->valid_hooks) { IP6T_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL);
duprintf("Valid hook crap: %08X vs %08X\n",
tmp.valid_hooks, t->valid_hooks);
ret = -EINVAL;
goto put_module;
}
oldinfo = xt_replace_table(t, tmp.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))
module_put(t->me);
if ((oldinfo->number > oldinfo->initial_entries) &&
(newinfo->number <= oldinfo->initial_entries))
module_put(t->me);
/* Get the old counters. */
get_counters(oldinfo, counters);
/* Decrease module usage counts and free resource */
loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()];
IP6T_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)
ret = -EFAULT;
vfree(counters);
xt_table_unlock(t);
return ret;
put_module:
module_put(t->me);
xt_table_unlock(t);
free_newinfo_counters_untrans:
IP6T_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry,NULL);
free_newinfo_counters:
vfree(counters);
free_newinfo: free_newinfo:
xt_free_table_info(newinfo); xt_free_table_info(newinfo);
return ret; return ret;
@ -1241,31 +1352,59 @@ add_counter_to_entry(struct ip6t_entry *e,
} }
static int 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; 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 xt_table_info *private; struct xt_table_info *private;
struct xt_table *t; struct xt_table *t;
int ret = 0; int ret = 0;
void *loc_cpu_entry; 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; 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; return -EINVAL;
paddc = vmalloc_node(len, numa_node_id()); paddc = vmalloc_node(len - size, numa_node_id());
if (!paddc) if (!paddc)
return -ENOMEM; return -ENOMEM;
if (copy_from_user(paddc, user, len) != 0) { if (copy_from_user(paddc, user + size, len - size) != 0) {
ret = -EFAULT; ret = -EFAULT;
goto free; goto free;
} }
t = xt_find_table_lock(AF_INET6, tmp.name); t = xt_find_table_lock(AF_INET6, name);
if (!t || IS_ERR(t)) { if (!t || IS_ERR(t)) {
ret = t ? PTR_ERR(t) : -ENOENT; ret = t ? PTR_ERR(t) : -ENOENT;
goto free; goto free;
@ -1273,7 +1412,7 @@ do_add_counters(void __user *user, unsigned int len)
write_lock_bh(&t->lock); write_lock_bh(&t->lock);
private = t->private; private = t->private;
if (private->number != tmp.num_counters) { if (private->number != num_counters) {
ret = -EINVAL; ret = -EINVAL;
goto unlock_up_free; goto unlock_up_free;
} }
@ -1284,7 +1423,7 @@ do_add_counters(void __user *user, unsigned int len)
IP6T_ENTRY_ITERATE(loc_cpu_entry, IP6T_ENTRY_ITERATE(loc_cpu_entry,
private->size, private->size,
add_counter_to_entry, add_counter_to_entry,
paddc->counters, paddc,
&i); &i);
unlock_up_free: unlock_up_free:
write_unlock_bh(&t->lock); write_unlock_bh(&t->lock);
@ -1296,6 +1435,567 @@ do_add_counters(void __user *user, unsigned int len)
return ret; return ret;
} }
#ifdef CONFIG_COMPAT
struct compat_ip6t_replace {
char name[IP6T_TABLE_MAXNAMELEN];
u32 valid_hooks;
u32 num_entries;
u32 size;
u32 hook_entry[NF_INET_NUMHOOKS];
u32 underflow[NF_INET_NUMHOOKS];
u32 num_counters;
compat_uptr_t counters; /* struct ip6t_counters * */
struct compat_ip6t_entry entries[0];
};
static int
compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr,
compat_uint_t *size, struct xt_counters *counters,
unsigned int *i)
{
struct ip6t_entry_target *t;
struct compat_ip6t_entry __user *ce;
u_int16_t target_offset, next_offset;
compat_uint_t origsize;
int ret;
ret = -EFAULT;
origsize = *size;
ce = (struct compat_ip6t_entry __user *)*dstptr;
if (copy_to_user(ce, e, sizeof(struct ip6t_entry)))
goto out;
if (copy_to_user(&ce->counters, &counters[*i], sizeof(counters[*i])))
goto out;
*dstptr += sizeof(struct compat_ip6t_entry);
*size -= sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
ret = IP6T_MATCH_ITERATE(e, xt_compat_match_to_user, dstptr, size);
target_offset = e->target_offset - (origsize - *size);
if (ret)
goto out;
t = ip6t_get_target(e);
ret = xt_compat_target_to_user(t, dstptr, size);
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;
(*i)++;
return 0;
out:
return ret;
}
static inline int
compat_find_calc_match(struct ip6t_entry_match *m,
const char *name,
const struct ip6t_ip6 *ipv6,
unsigned int hookmask,
int *size, int *i)
{
struct xt_match *match;
match = try_then_request_module(xt_find_match(AF_INET6, m->u.user.name,
m->u.user.revision),
"ip6t_%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;
*size += xt_compat_match_offset(match);
(*i)++;
return 0;
}
static inline int
compat_release_match(struct ip6t_entry_match *m, unsigned int *i)
{
if (i && (*i)-- == 0)
return 1;
module_put(m->u.kernel.match->me);
return 0;
}
static inline int
compat_release_entry(struct compat_ip6t_entry *e, unsigned int *i)
{
struct ip6t_entry_target *t;
if (i && (*i)-- == 0)
return 1;
/* Cleanup all matches */
COMPAT_IP6T_MATCH_ITERATE(e, compat_release_match, NULL);
t = compat_ip6t_get_target(e);
module_put(t->u.kernel.target->me);
return 0;
}
static inline int
check_compat_entry_size_and_hooks(struct compat_ip6t_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 ip6t_entry_target *t;
struct xt_target *target;
unsigned int entry_offset;
int ret, off, h, j;
duprintf("check_compat_entry_size_and_hooks %p\n", e);
if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0
|| (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit) {
duprintf("Bad offset %p, limit = %p\n", e, limit);
return -EINVAL;
}
if (e->next_offset < sizeof(struct compat_ip6t_entry) +
sizeof(struct compat_xt_entry_target)) {
duprintf("checking: element %p size %u\n",
e, e->next_offset);
return -EINVAL;
}
/* For purposes of check_entry casting the compat entry is fine */
ret = check_entry((struct ip6t_entry *)e, name);
if (ret)
return ret;
off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
entry_offset = (void *)e - (void *)base;
j = 0;
ret = COMPAT_IP6T_MATCH_ITERATE(e, compat_find_calc_match, name,
&e->ipv6, e->comefrom, &off, &j);
if (ret != 0)
goto release_matches;
t = compat_ip6t_get_target(e);
target = try_then_request_module(xt_find_target(AF_INET6,
t->u.user.name,
t->u.user.revision),
"ip6t_%s", t->u.user.name);
if (IS_ERR(target) || !target) {
duprintf("check_compat_entry_size_and_hooks: `%s' not found\n",
t->u.user.name);
ret = target ? PTR_ERR(target) : -ENOENT;
goto release_matches;
}
t->u.kernel.target = target;
off += xt_compat_target_offset(target);
*size += off;
ret = xt_compat_add_offset(AF_INET6, entry_offset, off);
if (ret)
goto out;
/* Check hooks & underflows */
for (h = 0; h < NF_INET_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 */
memset(&e->counters, 0, sizeof(e->counters));
e->comefrom = 0;
(*i)++;
return 0;
out:
module_put(t->u.kernel.target->me);
release_matches:
IP6T_MATCH_ITERATE(e, compat_release_match, &j);
return ret;
}
static int
compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr,
unsigned int *size, const char *name,
struct xt_table_info *newinfo, unsigned char *base)
{
struct ip6t_entry_target *t;
struct xt_target *target;
struct ip6t_entry *de;
unsigned int origsize;
int ret, h;
ret = 0;
origsize = *size;
de = (struct ip6t_entry *)*dstptr;
memcpy(de, e, sizeof(struct ip6t_entry));
memcpy(&de->counters, &e->counters, sizeof(e->counters));
*dstptr += sizeof(struct ip6t_entry);
*size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
ret = COMPAT_IP6T_MATCH_ITERATE(e, xt_compat_match_from_user,
dstptr, size);
if (ret)
return ret;
de->target_offset = e->target_offset - (origsize - *size);
t = compat_ip6t_get_target(e);
target = t->u.kernel.target;
xt_compat_target_from_user(t, dstptr, size);
de->next_offset = e->next_offset - (origsize - *size);
for (h = 0; h < NF_INET_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;
}
return ret;
}
static inline int compat_check_entry(struct ip6t_entry *e, const char *name,
unsigned int *i)
{
int j, ret;
j = 0;
ret = IP6T_MATCH_ITERATE(e, check_match, name, &e->ipv6,
e->comefrom, &j);
if (ret)
goto cleanup_matches;
ret = check_target(e, name);
if (ret)
goto cleanup_matches;
(*i)++;
return 0;
cleanup_matches:
IP6T_MATCH_ITERATE(e, cleanup_match, &j);
return ret;
}
static int
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, j;
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_INET_NUMHOOKS; i++) {
info->hook_entry[i] = 0xFFFFFFFF;
info->underflow[i] = 0xFFFFFFFF;
}
duprintf("translate_compat_table: size %u\n", info->size);
j = 0;
xt_compat_lock(AF_INET6);
/* Walk through entries, checking offsets. */
ret = COMPAT_IP6T_ENTRY_ITERATE(entry0, total_size,
check_compat_entry_size_and_hooks,
info, &size, entry0,
entry0 + total_size,
hook_entries, underflows, &j, name);
if (ret != 0)
goto out_unlock;
ret = -EINVAL;
if (j != number) {
duprintf("translate_compat_table: %u not %u entries\n",
j, number);
goto out_unlock;
}
/* Check hooks all assigned */
for (i = 0; i < NF_INET_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_INET_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 = COMPAT_IP6T_ENTRY_ITERATE(entry0, total_size,
compat_copy_entry_from_user,
&pos, &size, name, newinfo, entry1);
xt_compat_flush_offsets(AF_INET6);
xt_compat_unlock(AF_INET6);
if (ret)
goto free_newinfo;
ret = -ELOOP;
if (!mark_source_chains(newinfo, valid_hooks, entry1))
goto free_newinfo;
i = 0;
ret = IP6T_ENTRY_ITERATE(entry1, newinfo->size, compat_check_entry,
name, &i);
if (ret) {
j -= i;
COMPAT_IP6T_ENTRY_ITERATE_CONTINUE(entry0, newinfo->size, i,
compat_release_entry, &j);
IP6T_ENTRY_ITERATE(entry1, newinfo->size, cleanup_entry, &i);
xt_free_table_info(newinfo);
return ret;
}
/* And one copy for every other CPU */
for_each_possible_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:
COMPAT_IP6T_ENTRY_ITERATE(entry0, total_size, compat_release_entry, &j);
return ret;
out_unlock:
xt_compat_flush_offsets(AF_INET6);
xt_compat_unlock(AF_INET6);
goto out;
}
static int
compat_do_replace(void __user *user, unsigned int len)
{
int ret;
struct compat_ip6t_replace tmp;
struct xt_table_info *newinfo;
void *loc_cpu_entry;
if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
return -EFAULT;
/* overflow check */
if (tmp.size >= INT_MAX / num_possible_cpus())
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:
IP6T_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry, NULL);
free_newinfo:
xt_free_table_info(newinfo);
return ret;
}
static int
compat_do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user,
unsigned int len)
{
int ret;
if (!capable(CAP_NET_ADMIN))
return -EPERM;
switch (cmd) {
case IP6T_SO_SET_REPLACE:
ret = compat_do_replace(user, len);
break;
case IP6T_SO_SET_ADD_COUNTERS:
ret = do_add_counters(user, len, 1);
break;
default:
duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd);
ret = -EINVAL;
}
return ret;
}
struct compat_ip6t_get_entries {
char name[IP6T_TABLE_MAXNAMELEN];
compat_uint_t size;
struct compat_ip6t_entry entrytable[0];
};
static int
compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table,
void __user *userptr)
{
struct xt_counters *counters;
struct xt_table_info *private = table->private;
void __user *pos;
unsigned int size;
int ret = 0;
void *loc_cpu_entry;
unsigned int i = 0;
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 = IP6T_ENTRY_ITERATE(loc_cpu_entry, total_size,
compat_copy_entry_to_user,
&pos, &size, counters, &i);
vfree(counters);
return ret;
}
static int
compat_get_entries(struct compat_ip6t_get_entries __user *uptr, int *len)
{
int ret;
struct compat_ip6t_get_entries get;
struct xt_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_ip6t_get_entries) + get.size) {
duprintf("compat_get_entries: %u != %u\n", *len,
(unsigned int)(sizeof(struct compat_ip6t_get_entries) +
get.size));
return -EINVAL;
}
xt_compat_lock(AF_INET6);
t = xt_find_table_lock(AF_INET6, 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;
}
xt_compat_flush_offsets(AF_INET6);
module_put(t->me);
xt_table_unlock(t);
} else
ret = t ? PTR_ERR(t) : -ENOENT;
xt_compat_unlock(AF_INET6);
return ret;
}
static int do_ip6t_get_ctl(struct sock *, int, void __user *, int *);
static int
compat_do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
{
int ret;
if (!capable(CAP_NET_ADMIN))
return -EPERM;
switch (cmd) {
case IP6T_SO_GET_INFO:
ret = get_info(user, len, 1);
break;
case IP6T_SO_GET_ENTRIES:
ret = compat_get_entries(user, len);
break;
default:
ret = do_ip6t_get_ctl(sk, cmd, user, len);
}
return ret;
}
#endif
static int static int
do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len) do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
{ {
@ -1310,7 +2010,7 @@ do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
break; break;
case IP6T_SO_SET_ADD_COUNTERS: case IP6T_SO_SET_ADD_COUNTERS:
ret = do_add_counters(user, len); ret = do_add_counters(user, len, 0);
break; break;
default: default:
@ -1331,7 +2031,7 @@ do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
switch (cmd) { switch (cmd) {
case IP6T_SO_GET_INFO: case IP6T_SO_GET_INFO:
ret = get_info(user, len); ret = get_info(user, len, 0);
break; break;
case IP6T_SO_GET_ENTRIES: case IP6T_SO_GET_ENTRIES:
@ -1483,6 +2183,11 @@ static struct xt_target ip6t_standard_target __read_mostly = {
.name = IP6T_STANDARD_TARGET, .name = IP6T_STANDARD_TARGET,
.targetsize = sizeof(int), .targetsize = sizeof(int),
.family = AF_INET6, .family = AF_INET6,
#ifdef CONFIG_COMPAT
.compatsize = sizeof(compat_int_t),
.compat_from_user = compat_standard_from_user,
.compat_to_user = compat_standard_to_user,
#endif
}; };
static struct xt_target ip6t_error_target __read_mostly = { static struct xt_target ip6t_error_target __read_mostly = {
@ -1497,9 +2202,15 @@ static struct nf_sockopt_ops ip6t_sockopts = {
.set_optmin = IP6T_BASE_CTL, .set_optmin = IP6T_BASE_CTL,
.set_optmax = IP6T_SO_SET_MAX+1, .set_optmax = IP6T_SO_SET_MAX+1,
.set = do_ip6t_set_ctl, .set = do_ip6t_set_ctl,
#ifdef CONFIG_COMPAT
.compat_set = compat_do_ip6t_set_ctl,
#endif
.get_optmin = IP6T_BASE_CTL, .get_optmin = IP6T_BASE_CTL,
.get_optmax = IP6T_SO_GET_MAX+1, .get_optmax = IP6T_SO_GET_MAX+1,
.get = do_ip6t_get_ctl, .get = do_ip6t_get_ctl,
#ifdef CONFIG_COMPAT
.compat_get = compat_do_ip6t_get_ctl,
#endif
.owner = THIS_MODULE, .owner = THIS_MODULE,
}; };