// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (C) 2000-2002 Joakim Axelsson <[email protected]>
* Patrick Schaaf <[email protected]>
* Copyright (C) 2003-2013 Jozsef Kadlecsik <[email protected]>
*/
/* Kernel module for IP set management */
#include <linux/init.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/ip.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/rculist.h>
#include <net/netlink.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include <linux/netfilter.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/ipset/ip_set.h>
static LIST_HEAD(ip_set_type_list); /* all registered set types */
static DEFINE_MUTEX(ip_set_type_mutex); /* protects ip_set_type_list */
static DEFINE_RWLOCK(ip_set_ref_lock); /* protects the set refs */
struct ip_set_net {
struct ip_set * __rcu *ip_set_list; /* all individual sets */
ip_set_id_t ip_set_max; /* max number of sets */
bool is_deleted; /* deleted by ip_set_net_exit */
bool is_destroyed; /* all sets are destroyed */
};
static unsigned int ip_set_net_id __read_mostly;
static struct ip_set_net *ip_set_pernet(struct net *net)
{
return net_generic(net, ip_set_net_id);
}
#define IP_SET_INC 64
#define STRNCMP(a, b) (strncmp(a, b, IPSET_MAXNAMELEN) == 0)
static unsigned int max_sets;
module_param(max_sets, int, 0600);
MODULE_PARM_DESC(max_sets, "maximal number of sets");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jozsef Kadlecsik <[email protected]>");
MODULE_DESCRIPTION("core IP set support");
MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_IPSET);
/* When the nfnl mutex or ip_set_ref_lock is held: */
#define ip_set_dereference(inst) \
rcu_dereference_protected((inst)->ip_set_list, \
lockdep_nfnl_is_held(NFNL_SUBSYS_IPSET) || \
lockdep_is_held(&ip_set_ref_lock) || \
(inst)->is_deleted)
#define ip_set(inst, id) \
ip_set_dereference(inst)[id]
#define ip_set_ref_netlink(inst,id) \
rcu_dereference_raw((inst)->ip_set_list)[id]
#define ip_set_dereference_nfnl(p) \
rcu_dereference_check(p, lockdep_nfnl_is_held(NFNL_SUBSYS_IPSET))
/* The set types are implemented in modules and registered set types
* can be found in ip_set_type_list. Adding/deleting types is
* serialized by ip_set_type_mutex.
*/
static void
ip_set_type_lock(void)
{
mutex_lock(&ip_set_type_mutex);
}
static void
ip_set_type_unlock(void)
{
mutex_unlock(&ip_set_type_mutex);
}
/* Register and deregister settype */
static struct ip_set_type *
find_set_type(const char *name, u8 family, u8 revision)
{
struct ip_set_type *type;
list_for_each_entry_rcu(type, &ip_set_type_list, list,
lockdep_is_held(&ip_set_type_mutex))
if (STRNCMP(type->name, name) &&
(type->family == family ||
type->family == NFPROTO_UNSPEC) &&
revision >= type->revision_min &&
revision <= type->revision_max)
return type;
return NULL;
}
/* Unlock, try to load a set type module and lock again */
static bool
load_settype(const char *name)
{
nfnl_unlock(NFNL_SUBSYS_IPSET);
pr_debug("try to load ip_set_%s\n", name);
if (request_module("ip_set_%s", name) < 0) {
pr_warn("Can't find ip_set type %s\n", name);
nfnl_lock(NFNL_SUBSYS_IPSET);
return false;
}
nfnl_lock(NFNL_SUBSYS_IPSET);
return true;
}
/* Find a set type and reference it */
#define find_set_type_get(name, family, revision, found) \
__find_set_type_get(name, family, revision, found, false)
static int
__find_set_type_get(const char *name, u8 family, u8 revision,
struct ip_set_type **found, bool retry)
{
struct ip_set_type *type;
int err;
if (retry && !load_settype(name))
return -IPSET_ERR_FIND_TYPE;
rcu_read_lock();
*found = find_set_type(name, family, revision);
if (*found) {
err = !try_module_get((*found)->me) ? -EFAULT : 0;
goto unlock;
}
/* Make sure the type is already loaded
* but we don't support the revision
*/
list_for_each_entry_rcu(type, &ip_set_type_list, list)
if (STRNCMP(type->name, name)) {
err = -IPSET_ERR_FIND_TYPE;
goto unlock;
}
rcu_read_unlock();
return retry ? -IPSET_ERR_FIND_TYPE :
__find_set_type_get(name, family, revision, found, true);
unlock:
rcu_read_unlock();
return err;
}
/* Find a given set type by name and family.
* If we succeeded, the supported minimal and maximum revisions are
* filled out.
*/
#define find_set_type_minmax(name, family, min, max) \
__find_set_type_minmax(name, family, min, max, false)
static int
__find_set_type_minmax(const char *name, u8 family, u8 *min, u8 *max,
bool retry)
{
struct ip_set_type *type;
bool found = false;
if (retry && !load_settype(name))
return -IPSET_ERR_FIND_TYPE;
*min = 255; *max = 0;
rcu_read_lock();
list_for_each_entry_rcu(type, &ip_set_type_list, list)
if (STRNCMP(type->name, name) &&
(type->family == family ||
type->family == NFPROTO_UNSPEC)) {
found = true;
if (type->revision_min < *min)
*min = type->revision_min;
if (type->revision_max > *max)
*max = type->revision_max;
}
rcu_read_unlock();
if (found)
return 0;
return retry ? -IPSET_ERR_FIND_TYPE :
__find_set_type_minmax(name, family, min, max, true);
}
#define family_name(f) ((f) == NFPROTO_IPV4 ? "inet" : \
(f) == NFPROTO_IPV6 ? "inet6" : "any")
/* Register a set type structure. The type is identified by
* the unique triple of name, family and revision.
*/
int
ip_set_type_register(struct ip_set_type *type)
{
int ret = 0;
if (type->protocol != IPSET_PROTOCOL) {
pr_warn("ip_set type %s, family %s, revision %u:%u uses wrong protocol version %u (want %u)\n",
type->name, family_name(type->family),
type->revision_min, type->revision_max,
type->protocol, IPSET_PROTOCOL);
return -EINVAL;
}
ip_set_type_lock();
if (find_set_type(type->name, type->family, type->revision_min)) {
/* Duplicate! */
pr_warn("ip_set type %s, family %s with revision min %u already registered!\n",
type->name, family_name(type->family),
type->revision_min);
ip_set_type_unlock();
return -EINVAL;
}
list_add_rcu(&type->list, &ip_set_type_list);
pr_debug("type %s, family %s, revision %u:%u registered.\n",
type->name, family_name(type->family),
type->revision_min, type->revision_max);
ip_set_type_unlock();
return ret;
}
EXPORT_SYMBOL_GPL(ip_set_type_register);
/* Unregister a set type. There's a small race with ip_set_create */
void
ip_set_type_unregister(struct ip_set_type *type)
{
ip_set_type_lock();
if (!find_set_type(type->name, type->family, type->revision_min)) {
pr_warn("ip_set type %s, family %s with revision min %u not registered\n",
type->name, family_name(type->family),
type->revision_min);
ip_set_type_unlock();
return;
}
list_del_rcu(&type->list);
pr_debug("type %s, family %s with revision min %u unregistered.\n",
type->name, family_name(type->family), type->revision_min);
ip_set_type_unlock();
synchronize_rcu();
}
EXPORT_SYMBOL_GPL(ip_set_type_unregister);
/* Utility functions */
void *
ip_set_alloc(size_t size)
{
return kvzalloc(size, GFP_KERNEL_ACCOUNT);
}
EXPORT_SYMBOL_GPL(ip_set_alloc);
void
ip_set_free(void *members)
{
pr_debug("%p: free with %s\n", members,
is_vmalloc_addr(members) ? "vfree" : "kfree");
kvfree(members);
}
EXPORT_SYMBOL_GPL(ip_set_free);
static bool
flag_nested(const struct nlattr *nla)
{
return nla->nla_type & NLA_F_NESTED;
}
static const struct nla_policy ipaddr_policy[IPSET_ATTR_IPADDR_MAX + 1] = {
[IPSET_ATTR_IPADDR_IPV4] = { .type = NLA_U32 },
[IPSET_ATTR_IPADDR_IPV6] = NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)),
};
int
ip_set_get_ipaddr4(struct nlattr *nla, __be32 *ipaddr)
{
struct nlattr *tb[IPSET_ATTR_IPADDR_MAX + 1];
if (unlikely(!flag_nested(nla)))
return -IPSET_ERR_PROTOCOL;
if (nla_parse_nested(tb, IPSET_ATTR_IPADDR_MAX, nla,
ipaddr_policy, NULL))
return -IPSET_ERR_PROTOCOL;
if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_IPADDR_IPV4)))
return -IPSET_ERR_PROTOCOL;
*ipaddr = nla_get_be32(tb[IPSET_ATTR_IPADDR_IPV4]);
return 0;
}
EXPORT_SYMBOL_GPL(ip_set_get_ipaddr4);
int
ip_set_get_ipaddr6(struct nlattr *nla, union nf_inet_addr *ipaddr)
{
struct nlattr *tb[IPSET_ATTR_IPADDR_MAX + 1];
if (unlikely(!flag_nested(nla)))
return -IPSET_ERR_PROTOCOL;
if (nla_parse_nested(tb, IPSET_ATTR_IPADDR_MAX, nla,
ipaddr_policy, NULL))
return -IPSET_ERR_PROTOCOL;
if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_IPADDR_IPV6)))
return -IPSET_ERR_PROTOCOL;
memcpy(ipaddr, nla_data(tb[IPSET_ATTR_IPADDR_IPV6]),
sizeof(struct in6_addr));
return 0;
}
EXPORT_SYMBOL_GPL(ip_set_get_ipaddr6);
static u32
ip_set_timeout_get(const unsigned long *timeout)
{
u32 t;
if (*timeout == IPSET_ELEM_PERMANENT)
return 0;
t = jiffies_to_msecs(*timeout - jiffies) / MSEC_PER_SEC;
/* Zero value in userspace means no timeout */
return t == 0 ? 1 : t;
}
static char *
ip_set_comment_uget(struct nlattr *tb)
{
return nla_data(tb);
}
/* Called from uadd only, protected by the set spinlock.
* The kadt functions don't use the comment extensions in any way.
*/
void
ip_set_init_comment(struct ip_set *set, struct ip_set_comment *comment,
const struct ip_set_ext *ext)
{
struct ip_set_comment_rcu *c = rcu_dereference_protected(comment->c, 1);
size_t len = ext->comment ? strlen(ext->comment) : 0;
if (unlikely(c)) {
set->ext_size -= sizeof(*c) + strlen(c->str) + 1;
kfree_rcu(c, rcu);
rcu_assign_pointer(comment->c, NULL);
}
if (!len)
return;
if (unlikely(len > IPSET_MAX_COMMENT_SIZE))
len = IPSET_MAX_COMMENT_SIZE;
c = kmalloc(sizeof(*c) + len + 1, GFP_ATOMIC);
if (unlikely(!c))
return;
strscpy(c->str, ext->comment, len + 1);
set->ext_size += sizeof(*c) + strlen(c->str) + 1;
rcu_assign_pointer(comment->c, c);
}
EXPORT_SYMBOL_GPL(ip_set_init_comment);
/* Used only when dumping a set, protected by rcu_read_lock() */
static int
ip_set_put_comment(struct sk_buff *skb, const struct ip_set_comment *comment)
{
struct ip_set_comment_rcu *c = rcu_dereference(comment->c);
if (!c)
return 0;
return nla_put_string(skb, IPSET_ATTR_COMMENT, c->str);
}
/* Called from uadd/udel, flush or the garbage collectors protected
* by the set spinlock.
* Called when the set is destroyed and when there can't be any user
* of the set data anymore.
*/
static void
ip_set_comment_free(struct ip_set *set, void *ptr)
{
struct ip_set_comment *comment = ptr;
struct ip_set_comment_rcu *c;
c = rcu_dereference_protected(comment->c, 1);
if (unlikely(!c))
return;
set->ext_size -= sizeof(*c) + strlen(c->str) + 1;
kfree_rcu(c, rcu);
rcu_assign_pointer(comment->c, NULL);
}
typedef void (*destroyer)(struct ip_set *, void *);
/* ipset data extension types, in size order */
const struct ip_set_ext_type ip_set_extensions[] = {
[IPSET_EXT_ID_COUNTER] = {
.type = IPSET_EXT_COUNTER,
.flag = IPSET_FLAG_WITH_COUNTERS,
.len = sizeof(struct ip_set_counter),
.align = __alignof__(struct ip_set_counter),
},
[IPSET_EXT_ID_TIMEOUT] = {
.type = IPSET_EXT_TIMEOUT,
.len = sizeof(unsigned long),
.align = __alignof__(unsigned long),
},
[IPSET_EXT_ID_SKBINFO] = {
.type = IPSET_EXT_SKBINFO,
.flag = IPSET_FLAG_WITH_SKBINFO,
.len = sizeof(struct ip_set_skbinfo),
.align = __alignof__(struct ip_set_skbinfo),
},
[IPSET_EXT_ID_COMMENT] = {
.type = IPSET_EXT_COMMENT | IPSET_EXT_DESTROY,
.flag = IPSET_FLAG_WITH_COMMENT,
.len = sizeof(struct ip_set_comment),
.align = __alignof__(struct ip_set_comment),
.destroy = ip_set_comment_free,
},
};
EXPORT_SYMBOL_GPL(ip_set_extensions);
static bool
add_extension(enum ip_set_ext_id id, u32 flags, struct nlattr *tb[])
{
return ip_set_extensions[id].flag ?
(flags & ip_set_extensions[id].flag) :
!!tb[IPSET_ATTR_TIMEOUT];
}
size_t
ip_set_elem_len(struct ip_set *set, struct nlattr *tb[], size_t len,
size_t align)
{
enum ip_set_ext_id id;
u32 cadt_flags = 0;
if (tb[IPSET_ATTR_CADT_FLAGS])
cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
if (cadt_flags & IPSET_FLAG_WITH_FORCEADD)
set->flags |= IPSET_CREATE_FLAG_FORCEADD;
if (!align)
align = 1;
for (id = 0; id < IPSET_EXT_ID_MAX; id++) {
if (!add_extension(id, cadt_flags, tb))
continue;
if (align < ip_set_extensions[id].align)
align = ip_set_extensions[id].align;
len = ALIGN(len, ip_set_extensions[id].align);
set->offset[id] = len;
set->extensions |= ip_set_extensions[id].type;
len += ip_set_extensions[id].len;
}
return ALIGN(len, align);
}
EXPORT_SYMBOL_GPL(ip_set_elem_len);
int
ip_set_get_extensions(struct ip_set *set, struct nlattr *tb[],
struct ip_set_ext *ext)
{
u64 fullmark;
if (unlikely(!ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
!ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
!ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES) ||
!ip_set_optattr_netorder(tb, IPSET_ATTR_SKBMARK) ||
!ip_set_optattr_netorder(tb, IPSET_ATTR_SKBPRIO) ||
!ip_set_optattr_netorder(tb, IPSET_ATTR_SKBQUEUE)))
return -IPSET_ERR_PROTOCOL;
if (tb[IPSET_ATTR_TIMEOUT]) {
if (!SET_WITH_TIMEOUT(set))
return -IPSET_ERR_TIMEOUT;
ext->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
}
if (tb[IPSET_ATTR_BYTES] || tb[IPSET_ATTR_PACKETS]) {
if (!SET_WITH_COUNTER(set))
return -IPSET_ERR_COUNTER;
if (tb[IPSET_ATTR_BYTES])
ext->bytes = be64_to_cpu(nla_get_be64(
tb[IPSET_ATTR_BYTES]));
if (tb[IPSET_ATTR_PACKETS])
ext->packets = be64_to_cpu(nla_get_be64(
tb[IPSET_ATTR_PACKETS]));
}
if (tb[IPSET_ATTR_COMMENT]) {
if (!SET_WITH_COMMENT(set))
return -IPSET_ERR_COMMENT;
ext->comment = ip_set_comment_uget(tb[IPSET_ATTR_COMMENT]);
}
if (tb[IPSET_ATTR_SKBMARK]) {
if (!SET_WITH_SKBINFO(set))
return -IPSET_ERR_SKBINFO;
fullmark = be64_to_cpu(nla_get_be64(tb[IPSET_ATTR_SKBMARK]));
ext->skbinfo.skbmark = fullmark >> 32;
ext->skbinfo.skbmarkmask = fullmark & 0xffffffff;
}
if (tb[IPSET_ATTR_SKBPRIO]) {
if (!SET_WITH_SKBINFO(set))
return -IPSET_ERR_SKBINFO;
ext->skbinfo.skbprio =
be32_to_cpu(nla_get_be32(tb[IPSET_ATTR_SKBPRIO]));
}
if (tb[IPSET_ATTR_SKBQUEUE]) {
if (!SET_WITH_SKBINFO(set))
return -IPSET_ERR_SKBINFO;
ext->skbinfo.skbqueue =
be16_to_cpu(nla_get_be16(tb[IPSET_ATTR_SKBQUEUE]));
}
return 0;
}
EXPORT_SYMBOL_GPL(ip_set_get_extensions);
static u64
ip_set_get_bytes(const struct ip_set_counter *counter)
{
return (u64)atomic64_read(&(counter)->bytes);
}
static u64
ip_set_get_packets(const struct ip_set_counter *counter)
{
return (u64)atomic64_read(&(counter)->packets);
}
static bool
ip_set_put_counter(struct sk_buff *skb, const struct ip_set_counter *counter)
{
return nla_put_net64(skb, IPSET_ATTR_BYTES,
cpu_to_be64(ip_set_get_bytes(counter)),
IPSET_ATTR_PAD) ||
nla_put_net64(skb, IPSET_ATTR_PACKETS,
cpu_to_be64(ip_set_get_packets(counter)),
IPSET_ATTR_PAD);
}
static bool
ip_set_put_skbinfo(struct sk_buff *skb, const struct ip_set_skbinfo *skbinfo)
{
/* Send nonzero parameters only */
return ((skbinfo->skbmark || skbinfo->skbmarkmask) &&
nla_put_net64(skb, IPSET_ATTR_SKBMARK,
cpu_to_be64((u64)skbinfo->skbmark << 32 |
skbinfo->skbmarkmask),
IPSET_ATTR_PAD)) ||
(skbinfo->skbprio &&
nla_put_net32(skb, IPSET_ATTR_SKBPRIO,
cpu_to_be32(skbinfo->skbprio))) ||
(skbinfo->skbqueue &&
nla_put_net16(skb, IPSET_ATTR_SKBQUEUE,
cpu_to_be16(skbinfo->skbqueue)));
}
int
ip_set_put_extensions(struct sk_buff *skb, const struct ip_set *set,
const void *e, bool active)
{
if (SET_WITH_TIMEOUT(set)) {
unsigned long *timeout = ext_timeout(e, set);
if (nla_put_net32(skb, IPSET_ATTR_TIMEOUT,
htonl(active ? ip_set_timeout_get(timeout)
: *timeout)))
return -EMSGSIZE;
}
if (SET_WITH_COUNTER(set) &&
ip_set_put_counter(skb, ext_counter(e, set)))
return -EMSGSIZE;
if (SET_WITH_COMMENT(set) &&
ip_set_put_comment(skb, ext_comment(e, set)))
return -EMSGSIZE;
if (SET_WITH_SKBINFO(set) &&
ip_set_put_skbinfo(skb, ext_skbinfo(e, set)))
return -EMSGSIZE;
return 0;
}
EXPORT_SYMBOL_GPL(ip_set_put_extensions);
static bool
ip_set_match_counter(u64 counter, u64 match, u8 op)
{
switch (op) {
case IPSET_COUNTER_NONE:
return true;
case IPSET_COUNTER_EQ:
return counter == match;
case IPSET_COUNTER_NE:
return counter != match;
case IPSET_COUNTER_LT:
return counter < match;
case IPSET_COUNTER_GT:
return counter > match;
}
return false;
}
static void
ip_set_add_bytes(u64 bytes, struct ip_set_counter *counter)
{
atomic64_add((long long)bytes, &(counter)->bytes);
}
static void
ip_set_add_packets(u64 packets, struct ip_set_counter *counter)
{
atomic64_add((long long)packets, &(counter)->packets);
}
static void
ip_set_update_counter(struct ip_set_counter *counter,
const struct ip_set_ext *ext, u32 flags)
{
if (ext->packets != ULLONG_MAX &&
!(flags & IPSET_FLAG_SKIP_COUNTER_UPDATE)) {
ip_set_add_bytes(ext->bytes, counter);
ip_set_add_packets(ext->packets, counter);
}
}
static void
ip_set_get_skbinfo(struct ip_set_skbinfo *skbinfo,
const struct ip_set_ext *ext,
struct ip_set_ext *mext, u32 flags)
{
mext->skbinfo = *skbinfo;
}
bool
ip_set_match_extensions(struct ip_set *set, const struct ip_set_ext *ext,
struct ip_set_ext *mext, u32 flags, void *data)
{
if (SET_WITH_TIMEOUT(set) &&
ip_set_timeout_expired(ext_timeout(data, set)))
return false;
if (SET_WITH_COUNTER(set)) {
struct ip_set_counter *counter = ext_counter(data, set);
ip_set_update_counter(counter, ext, flags);
if (flags & IPSET_FLAG_MATCH_COUNTERS &&
!(ip_set_match_counter(ip_set_get_packets(counter),
mext->packets, mext->packets_op) &&
ip_set_match_counter(ip_set_get_bytes(counter),
mext->bytes, mext->bytes_op)))
return false;
}
if (SET_WITH_SKBINFO(set))
ip_set_get_skbinfo(ext_skbinfo(data, set),
ext, mext, flags);
return true;
}
EXPORT_SYMBOL_GPL(ip_set_match_extensions);
/* Creating/destroying/renaming/swapping affect the existence and
* the properties of a set. All of these can be executed from userspace
* only and serialized by the nfnl mutex indirectly from nfnetlink.
*
* Sets are identified by their index in ip_set_list and the index
* is used by the external references (set/SET netfilter modules).
*
* The set behind an index may change by swapping only, from userspace.
*/
static void
__ip_set_get(struct ip_set *set)
{
write_lock_bh(&ip_set_ref_lock);
set->ref++;
write_unlock_bh(&ip_set_ref_lock);
}
static void
__ip_set_put(struct ip_set *set)
{
write_lock_bh(&ip_set_ref_lock);
BUG_ON(set->ref == 0);
set->ref--;
write_unlock_bh(&ip_set_ref_lock);
}
/* set->ref can be swapped out by ip_set_swap, netlink events (like dump) need
* a separate reference counter
*/
static void
__ip_set_get_netlink(struct ip_set *set)
{
write_lock_bh(&ip_set_ref_lock);
set->ref_netlink++;
write_unlock_bh(&ip_set_ref_lock);
}
static void
__ip_set_put_netlink(struct ip_set *set)
{
write_lock_bh(&ip_set_ref_lock);
BUG_ON(set->ref_netlink == 0);
set->ref_netlink--;
write_unlock_bh(&ip_set_ref_lock);
}
/* Add, del and test set entries from kernel.
*
* The set behind the index must exist and must be referenced
* so it can't be destroyed (or changed) under our foot.
*/
static struct ip_set *
ip_set_rcu_get(struct net *net, ip_set_id_t index)
{
struct ip_set_net *inst = ip_set_pernet(net);
/* ip_set_list and the set pointer need to be protected */
return ip_set_dereference_nfnl(inst->ip_set_list)[index];
}
static inline void
ip_set_lock(struct ip_set *set)
{
if (!set->variant->region_lock)
spin_lock_bh(&set->lock);
}
static inline void
ip_set_unlock(struct ip_set *set)
{
if (!set->variant->region_lock)
spin_unlock_bh(&set->lock);
}
int
ip_set_test(ip_set_id_t index, const struct sk_buff *skb,
const struct xt_action_param *par, struct ip_set_adt_opt *opt)
{
struct ip_set *set = ip_set_rcu_get(xt_net(par), index);
int ret = 0;
BUG_ON(!set);
pr_debug("set %s, index %u\n", set->name, index);
if (opt->dim < set->type->dimension ||
!(opt->family == set->family || set->family == NFPROTO_UNSPEC))
return 0;
ret = set->variant->kadt(set, skb, par, IPSET_TEST, opt);
if (ret == -EAGAIN) {
/* Type requests element to be completed */
pr_debug("element must be completed, ADD is triggered\n");
ip_set_lock(set);
set->variant->kadt(set, skb, par, IPSET_ADD, opt);
ip_set_unlock(set);
ret = 1;
} else {
/* --return-nomatch: invert matched element */
if ((opt->cmdflags & IPSET_FLAG_RETURN_NOMATCH) &&
(set->type->features & IPSET_TYPE_NOMATCH) &&
(ret > 0 || ret == -ENOTEMPTY))
ret = -ret;
}
/* Convert error codes to nomatch */
return (ret < 0 ? 0 : ret);
}
EXPORT_SYMBOL_GPL(ip_set_test);
int
ip_set_add(ip_set_id_t index, const struct sk_buff *skb,
const struct xt_action_param *par, struct ip_set_adt_opt *opt)
{
struct ip_set *set = ip_set_rcu_get(xt_net(par), index);
int ret;
BUG_ON(!set);
pr_debug("set %s, index %u\n", set->name, index);
if (opt->dim < set->type->dimension ||
!(opt->family == set->family || set->family == NFPROTO_UNSPEC))
return -IPSET_ERR_TYPE_MISMATCH;
ip_set_lock(set);
ret = set->variant->kadt(set, skb, par, IPSET_ADD, opt);
ip_set_unlock(set);
return ret;
}
EXPORT_SYMBOL_GPL(ip_set_add);
int
ip_set_del(ip_set_id_t index, const struct sk_buff *skb,
const struct xt_action_param *par, struct ip_set_adt_opt *opt)
{
struct ip_set *set = ip_set_rcu_get(xt_net(par), index);
int ret = 0;
BUG_ON(!set);
pr_debug("set %s, index %u\n", set->name, index);
if (opt->dim < set->type->dimension ||
!(opt->family == set->family || set->family == NFPROTO_UNSPEC))
return -IPSET_ERR_TYPE_MISMATCH;
ip_set_lock(set);
ret = set->variant->kadt(set, skb, par, IPSET_DEL, opt);
ip_set_unlock(set);
return ret;
}
EXPORT_SYMBOL_GPL(ip_set_del);
/* Find set by name, reference it once. The reference makes sure the
* thing pointed to, does not go away under our feet.
*
*/
ip_set_id_t
ip_set_get_byname(struct net *net, const char *name, struct ip_set **set)
{
ip_set_id_t i, index = IPSET_INVALID_ID;
struct ip_set *s;
struct ip_set_net *inst = ip_set_pernet(net);
rcu_read_lock();
for (i = 0; i < inst->ip_set_max; i++) {
s = rcu_dereference(inst->ip_set_list)[i];
if (s && STRNCMP(s->name, name)) {
__ip_set_get(s);
index = i;
*set = s;
break;
}
}
rcu_read_unlock();
return index;
}
EXPORT_SYMBOL_GPL(ip_set_get_byname);
/* If the given set pointer points to a valid set, decrement
* reference count by 1. The caller shall not assume the index
* to be valid, after calling this function.
*
*/
static void
__ip_set_put_byindex(struct ip_set_net *inst, ip_set_id_t index)
{
struct ip_set *set;
rcu_read_lock();
set = rcu_dereference(inst->ip_set_list)[index];
if (set)
__ip_set_put(set);
rcu_read_unlock();
}
void
ip_set_put_byindex(struct net *net, ip_set_id_t index)
{
struct ip_set_net *inst = ip_set_pernet(net);
__ip_set_put_byindex(inst, index);
}
EXPORT_SYMBOL_GPL(ip_set_put_byindex);
/* Get the name of a set behind a set index.
* Set itself is protected by RCU, but its name isn't: to protect against
* renaming, grab ip_set_ref_lock as reader (see ip_set_rename()) and copy the
* name.
*/
void
ip_set_name_byindex(struct net *net, ip_set_id_t index, char *name)
{
struct ip_set *set = ip_set_rcu_get(net, index);
BUG_ON(!set);
read_lock_bh(&ip_set_ref_lock);
strscpy_pad(name, set->name, IPSET_MAXNAMELEN);
read_unlock_bh(&ip_set_ref_lock);
}
EXPORT_SYMBOL_GPL(ip_set_name_byindex);
/* Routines to call by external subsystems, which do not
* call nfnl_lock for us.
*/
/* Find set by index, reference it once. The reference makes sure the
* thing pointed to, does not go away under our feet.
*
* The nfnl mutex is used in the function.
*/
ip_set_id_t
ip_set_nfnl_get_byindex(struct net *net, ip_set_id_t index)
{
struct ip_set *set;
struct ip_set_net *inst = ip_set_pernet(net);
if (index >= inst->ip_set_max)
return IPSET_INVALID_ID;
nfnl_lock(NFNL_SUBSYS_IPSET);
set = ip_set(inst, index);
if (set)
__ip_set_get(set);
else
index = IPSET_INVALID_ID;
nfnl_unlock(NFNL_SUBSYS_IPSET);
return index;
}
EXPORT_SYMBOL_GPL(ip_set_nfnl_get_byindex);
/* If the given set pointer points to a valid set, decrement
* reference count by 1. The caller shall not assume the index
* to be valid, after calling this function.
*
* The nfnl mutex is used in the function.
*/
void
ip_set_nfnl_put(struct net *net, ip_set_id_t index)
{
struct ip_set *set;
struct ip_set_net *inst = ip_set_pernet(net);
nfnl_lock(NFNL_SUBSYS_IPSET);
if (!inst->is_deleted) { /* already deleted from ip_set_net_exit() */
set = ip_set(inst, index);
if (set)
__ip_set_put(set);
}
nfnl_unlock(NFNL_SUBSYS_IPSET);
}
EXPORT_SYMBOL_GPL(ip_set_nfnl_put);
/* Communication protocol with userspace over netlink.
*
* The commands are serialized by the nfnl mutex.
*/
static inline u8 protocol(const struct nlattr * const tb[])
{
return nla_get_u8(tb[IPSET_ATTR_PROTOCOL]);
}
static inline bool
protocol_failed(const struct nlattr * const tb[])
{
return !tb[IPSET_ATTR_PROTOCOL] || protocol(tb) != IPSET_PROTOCOL;
}
static inline bool
protocol_min_failed(const struct nlattr * const tb[])
{
return !tb[IPSET_ATTR_PROTOCOL] || protocol(tb) < IPSET_PROTOCOL_MIN;
}
static inline u32
flag_exist(const struct nlmsghdr *nlh)
{
return nlh->nlmsg_flags & NLM_F_EXCL ? 0 : IPSET_FLAG_EXIST;
}
static struct nlmsghdr *
start_msg(struct sk_buff *skb, u32 portid, u32 seq, unsigned int flags,
enum ipset_cmd cmd)
{
return nfnl_msg_put(skb, portid, seq,
nfnl_msg_type(NFNL_SUBSYS_IPSET, cmd), flags,
NFPROTO_IPV4, NFNETLINK_V0, 0);
}
/* Create a set */
static const struct nla_policy ip_set_create_policy[IPSET_ATTR_CMD_MAX + 1] = {
[IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 },
[IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING,
.len = IPSET_MAXNAMELEN - 1 },
[IPSET_ATTR_TYPENAME] = { .type = NLA_NUL_STRING,
.len = IPSET_MAXNAMELEN - 1},
[IPSET_ATTR_REVISION] = { .type = NLA_U8 },
[IPSET_ATTR_FAMILY] = { .type = NLA_U8 },
[IPSET_ATTR_DATA] = { .type = NLA_NESTED },
};
static struct ip_set *
find_set_and_id(struct ip_set_net *inst, const char *name, ip_set_id_t *id)
{
struct ip_set *set = NULL;
ip_set_id_t i;
*id = IPSET_INVALID_ID;
for (i = 0; i < inst->ip_set_max; i++) {
set = ip_set(inst, i);
if (set && STRNCMP(set->name, name)) {
*id = i;
break;
}
}
return (*id == IPSET_INVALID_ID ? NULL : set);
}
static inline struct ip_set *
find_set(struct ip_set_net *inst, const char *name)
{
ip_set_id_t id;
return find_set_and_id(inst, name, &id);
}
static int
find_free_id(struct ip_set_net *inst, const char *name, ip_set_id_t *index,
struct ip_set **set)
{
struct ip_set *s;
ip_set_id_t i;
*index = IPSET_INVALID_ID;
for (i = 0; i < inst->ip_set_max; i++) {
s = ip_set(inst, i);
if (!s) {
if (*index == IPSET_INVALID_ID)
*index = i;
} else if (STRNCMP(name, s->name)) {
/* Name clash */
*set = s;
return -EEXIST;
}
}
if (*index == IPSET_INVALID_ID)
/* No free slot remained */
return -IPSET_ERR_MAX_SETS;
return 0;
}
static int ip_set_none(struct sk_buff *skb, const struct nfnl_info *info,
const struct nlattr * const attr[])
{
return -EOPNOTSUPP;
}
static int ip_set_create(struct sk_buff *skb, const struct nfnl_info *info,
const struct nlattr * const attr[])
{
struct ip_set_net *inst = ip_set_pernet(info->net);
struct ip_set *set, *clash = NULL;
ip_set_id_t index = IPSET_INVALID_ID;
struct nlattr *tb[IPSET_ATTR_CREATE_MAX + 1] = {};
const char *name, *typename;
u8 family, revision;
u32 flags = flag_exist(info->nlh);
int ret = 0;
if (unlikely(protocol_min_failed(attr) ||
!attr[IPSET_ATTR_SETNAME] ||
!attr[IPSET_ATTR_TYPENAME] ||
!attr[IPSET_ATTR_REVISION] ||
!attr[IPSET_ATTR_FAMILY] ||
(attr[IPSET_ATTR_DATA] &&
!flag_nested(attr[IPSET_ATTR_DATA]))))
return -IPSET_ERR_PROTOCOL;
name = nla_data(attr[IPSET_ATTR_SETNAME]);
typename = nla_data(attr[IPSET_ATTR_TYPENAME]);
family = nla_get_u8(attr[IPSET_ATTR_FAMILY]);
revision = nla_get_u8(attr[IPSET_ATTR_REVISION]);
pr_debug("setname: %s, typename: %s, family: %s, revision: %u\n",
name, typename, family_name(family), revision);
/* First, and without any locks, allocate and initialize
* a normal base set structure.
*/
set = kzalloc(sizeof(*set), GFP_KERNEL);
if (!set)
return -ENOMEM;
spin_lock_init(&set->lock);
strscpy(set->name, name, IPSET_MAXNAMELEN);
set->family = family;
set->revision = revision;
/* Next, check that we know the type, and take
* a reference on the type, to make sure it stays available
* while constructing our new set.
*
* After referencing the type, we try to create the type
* specific part of the set without holding any locks.
*/
ret = find_set_type_get(typename, family, revision, &set->type);
if (ret)
goto out;
/* Without holding any locks, create private part. */
if (attr[IPSET_ATTR_DATA] &&
nla_parse_nested(tb, IPSET_ATTR_CREATE_MAX, attr[IPSET_ATTR_DATA],
set->type->create_policy, NULL)) {
ret = -IPSET_ERR_PROTOCOL;
goto put_out;
}
/* Set create flags depending on the type revision */
set->flags |= set->type->create_flags[revision];
ret = set->type->create(info->net, set, tb, flags);
if (ret != 0)
goto put_out;
/* BTW, ret==0 here. */
/* Here, we have a valid, constructed set and we are protected
* by the nfnl mutex. Find the first free index in ip_set_list
* and check clashing.
*/
ret = find_free_id(inst, set->name, &index, &clash);
if (ret == -EEXIST) {
/* If this is the same set and requested, ignore error */
if ((flags & IPSET_FLAG_EXIST) &&
STRNCMP(set->type->name, clash->type->name) &&
set->type->family == clash->type->family &&
set->type->revision_min == clash->type->revision_min &&
set->type->revision_max == clash->type->revision_max &&
set->variant->same_set(set, clash))
ret = 0;
goto cleanup;
} else if (ret == -IPSET_ERR_MAX_SETS) {
struct ip_set **list, **tmp;
ip_set_id_t i = inst->ip_set_max + IP_SET_INC;
if (i < inst->ip_set_max || i == IPSET_INVALID_ID)
/* Wraparound */
goto cleanup;
list = kvcalloc(i, sizeof(struct ip_set *), GFP_KERNEL);
if (!list)
goto cleanup;
/* nfnl mutex is held, both lists are valid */
tmp = ip_set_dereference(inst);
memcpy(list, tmp, sizeof(struct ip_set *) * inst->ip_set_max);
rcu_assign_pointer(inst->ip_set_list, list);
/* Make sure all current packets have passed through */
synchronize_net();
/* Use new list */
index = inst->ip_set_max;
inst->ip_set_max = i;
kvfree(tmp);
ret = 0;
} else if (ret) {
goto cleanup;
}
/* Finally! Add our shiny new set to the list, and be done. */
pr_debug("create: '%s' created with index %u!\n", set->name, index);
ip_set(inst, index) = set;
return ret;
cleanup:
set->variant->cancel_gc(set);
set->variant->destroy(set);
put_out:
module_put(set->type->me);
out:
kfree(set);
return ret;
}
/* Destroy sets */
static const struct nla_policy
ip_set_setname_policy[IPSET_ATTR_CMD_MAX + 1] = {
[IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 },
[IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING,
.len = IPSET_MAXNAMELEN - 1 },
};
/* In order to return quickly when destroying a single set, it is split
* into two stages:
* - Cancel garbage collector
* - Destroy the set itself via call_rcu()
*/
static void
ip_set_destroy_set_rcu(struct rcu_head *head)
{
struct ip_set *set = container_of(head, struct ip_set, rcu);
set->variant->destroy(set);
module_put(set->type->me);
kfree(set);
}
static void
_destroy_all_sets(struct ip_set_net *inst)
{
struct ip_set *set;
ip_set_id_t i;
bool need_wait = false;
/* First cancel gc's: set:list sets are flushed as well */
for (i = 0; i < inst->ip_set_max; i++) {
set = ip_set(inst, i);
if (set) {
set->variant->cancel_gc(set);
if (set->type->features & IPSET_TYPE_NAME)
need_wait = true;
}
}
/* Must wait for flush to be really finished */
if (need_wait)
rcu_barrier();
for (i = 0; i < inst->ip_set_max; i++) {
set = ip_set(inst, i);
if (set) {
ip_set(inst, i) = NULL;
set->variant->destroy(set);
module_put(set->type->me);
kfree(set);
}
}
}
static int ip_set_destroy(struct sk_buff *skb, const struct nfnl_info *info,
const struct nlattr * const attr[])
{
struct ip_set_net *inst = ip_set_pernet(info->net);
struct ip_set *s;
ip_set_id_t i;
int ret = 0;
if (unlikely(protocol_min_failed(attr)))
return -IPSET_ERR_PROTOCOL;
/* Commands are serialized and references are
* protected by the ip_set_ref_lock.
* External systems (i.e. xt_set) must call
* ip_set_nfnl_get_* functions, that way we
* can safely check references here.
*
* list:set timer can only decrement the reference
* counter, so if it's already zero, we can proceed
* without holding the lock.
*/
if (!attr[IPSET_ATTR_SETNAME]) {
read_lock_bh(&ip_set_ref_lock);
for (i = 0; i < inst->ip_set_max; i++) {
s = ip_set(inst, i);
if (s && (s->ref || s->ref_netlink)) {
ret = -IPSET_ERR_BUSY;
goto out;
}
}
inst->is_destroyed = true;
read_unlock_bh(&ip_set_ref_lock);
_destroy_all_sets(inst);
/* Modified by ip_set_destroy() only, which is serialized */
inst->is_destroyed = false;
} else {
u32 flags = flag_exist(info->nlh);
u16 features = 0;
read_lock_bh(&ip_set_ref_lock);
s = find_set_and_id(inst, nla_data(attr[IPSET_ATTR_SETNAME]),
&i);
if (!s) {
if (!(flags & IPSET_FLAG_EXIST))
ret = -ENOENT;
goto out;
} else if (s->ref || s->ref_netlink) {
ret = -IPSET_ERR_BUSY;
goto out;
}
features = s->type->features;
ip_set(inst, i) = NULL;
read_unlock_bh(&ip_set_ref_lock);
/* Must cancel garbage collectors */
s->variant->cancel_gc(s);
if (features & IPSET_TYPE_NAME) {
/* Must wait for flush to be really finished */
rcu_barrier();
}
call_rcu(&s->rcu, ip_set_destroy_set_rcu);
}
return 0;
out:
read_unlock_bh(&ip_set_ref_lock);
return ret;
}
/* Flush sets */
static void
ip_set_flush_set(struct ip_set *set)
{
pr_debug("set: %s\n", set->name);
ip_set_lock(set);
set->variant->flush(set);
ip_set_unlock(set);
}
static int ip_set_flush(struct sk_buff *skb, const struct nfnl_info *info,
const struct nlattr * const attr[])
{
struct ip_set_net *inst = ip_set_pernet(info->net);
struct ip_set *s;
ip_set_id_t i;
if (unlikely(protocol_min_failed(attr)))
return -IPSET_ERR_PROTOCOL;
if (!attr[IPSET_ATTR_SETNAME]) {
for (i = 0; i < inst->ip_set_max; i++) {
s = ip_set(inst, i);
if (s)
ip_set_flush_set(s);
}
} else {
s = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME]));
if (!s)
return -ENOENT;
ip_set_flush_set(s);
}
return 0;
}
/* Rename a set */
static const struct nla_policy
ip_set_setname2_policy[IPSET_ATTR_CMD_MAX + 1] = {
[IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 },
[IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING,
.len = IPSET_MAXNAMELEN - 1 },
[IPSET_ATTR_SETNAME2] = { .type = NLA_NUL_STRING,
.len = IPSET_MAXNAMELEN - 1 },
};
static int ip_set_rename(struct sk_buff *skb, const struct nfnl_info *info,
const struct nlattr * const attr[])
{
struct ip_set_net *inst = ip_set_pernet(info->net);
struct ip_set *set, *s;
const char *name2;
ip_set_id_t i;
int ret = 0;
if (unlikely(protocol_min_failed(attr) ||
!attr[IPSET_ATTR_SETNAME] ||
!attr[IPSET_ATTR_SETNAME2]))
return -IPSET_ERR_PROTOCOL;
set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME]));
if (!set)
return -ENOENT;
write_lock_bh(&ip_set_ref_lock);
if (set->ref != 0 || set->ref_netlink != 0) {
ret = -IPSET_ERR_REFERENCED;
goto out;
}
name2 = nla_data(attr[IPSET_ATTR_SETNAME2]);
for (i = 0; i < inst->ip_set_max; i++) {
s = ip_set(inst, i);
if (s && STRNCMP(s->name, name2)) {
ret = -IPSET_ERR_EXIST_SETNAME2;
goto out;
}
}
strscpy_pad(set->name, name2, IPSET_MAXNAMELEN);
out:
write_unlock_bh(&ip_set_ref_lock);
return ret;
}
/* Swap two sets so that name/index points to the other.
* References and set names are also swapped.
*
* The commands are serialized by the nfnl mutex and references are
* protected by the ip_set_ref_lock. The kernel interfaces
* do not hold the mutex but the pointer settings are atomic
* so the ip_set_list always contains valid pointers to the sets.
*/
static int ip_set_swap(struct sk_buff *skb, const struct nfnl_info *info,
const struct nlattr * const attr[])
{
struct ip_set_net *inst = ip_set_pernet(info->net);
struct ip_set *from, *to;
ip_set_id_t from_id, to_id;
char from_name[IPSET_MAXNAMELEN];
if (unlikely(protocol_min_failed(attr) ||
!attr[IPSET_ATTR_SETNAME] ||
!attr[IPSET_ATTR_SETNAME2]))
return -IPSET_ERR_PROTOCOL;
from = find_set_and_id(inst, nla_data(attr[IPSET_ATTR_SETNAME]),
&from_id);
if (!from)
return -ENOENT;
to = find_set_and_id(inst, nla_data(attr[IPSET_ATTR_SETNAME2]),
&to_id);
if (!to)
return -IPSET_ERR_EXIST_SETNAME2;
/* Features must not change.
* Not an artifical restriction anymore, as we must prevent
* possible loops created by swapping in setlist type of sets.
*/
if (!(from->type->features == to->type->features &&
from->family == to->family))
return -IPSET_ERR_TYPE_MISMATCH;
write_lock_bh(&ip_set_ref_lock);
if (from->ref_netlink || to->ref_netlink) {
write_unlock_bh(&ip_set_ref_lock);
return -EBUSY;
}
strscpy_pad(from_name, from->name, IPSET_MAXNAMELEN);
strscpy_pad(from->name, to->name, IPSET_MAXNAMELEN);
strscpy_pad(to->name, from_name, IPSET_MAXNAMELEN);
swap(from->ref, to->ref);
ip_set(inst, from_id) = to;
ip_set(inst, to_id) = from;
write_unlock_bh(&ip_set_ref_lock);
return 0;
}
/* List/save set data */
#define DUMP_INIT 0
#define DUMP_ALL 1
#define DUMP_ONE 2
#define DUMP_LAST 3
#define DUMP_TYPE(arg) (((u32)(arg)) & 0x0000FFFF)
#define DUMP_FLAGS(arg) (((u32)(arg)) >> 16)
int
ip_set_put_flags(struct sk_buff *skb, struct ip_set *set)
{
u32 cadt_flags = 0;
if (SET_WITH_TIMEOUT(set))
if (unlikely(nla_put_net32(skb, IPSET_ATTR_TIMEOUT,
htonl(set->timeout))))
return -EMSGSIZE;
if (SET_WITH_COUNTER(set))
cadt_flags |= IPSET_FLAG_WITH_COUNTERS;
if (SET_WITH_COMMENT(set))
cadt_flags |= IPSET_FLAG_WITH_COMMENT;
if (SET_WITH_SKBINFO(set))
cadt_flags |= IPSET_FLAG_WITH_SKBINFO;
if (SET_WITH_FORCEADD(set))
cadt_flags |= IPSET_FLAG_WITH_FORCEADD;
if (!cadt_flags)
return 0;
return nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(cadt_flags));
}
EXPORT_SYMBOL_GPL(ip_set_put_flags);
static int
ip_set_dump_done(struct netlink_callback *cb)
{
if (cb->args[IPSET_CB_ARG0]) {
struct ip_set_net *inst =
(struct ip_set_net *)cb->args[IPSET_CB_NET];
ip_set_id_t index = (ip_set_id_t)cb->args[IPSET_CB_INDEX];
struct ip_set *set = ip_set_ref_netlink(inst, index);
if (set->variant->uref)
set->variant->uref(set, cb, false);
pr_debug("release set %s\n", set->name);
__ip_set_put_netlink(set);
}
return 0;
}
static inline void
dump_attrs(struct nlmsghdr *nlh)
{
const struct nlattr *attr;
int rem;
pr_debug("dump nlmsg\n");
nlmsg_for_each_attr(attr, nlh, sizeof(struct nfgenmsg), rem) {
pr_debug("type: %u, len %u\n", nla_type(attr), attr->nla_len);
}
}
static const struct nla_policy
ip_set_dump_policy[IPSET_ATTR_CMD_MAX + 1] = {
[IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 },
[IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING,
.len = IPSET_MAXNAMELEN - 1 },
[IPSET_ATTR_FLAGS] = { .type = NLA_U32 },
};
static int
ip_set_dump_start(struct netlink_callback *cb)
{
struct nlmsghdr *nlh = nlmsg_hdr(cb->skb);
int min_len = nlmsg_total_size(sizeof(struct nfgenmsg));
struct nlattr *cda[IPSET_ATTR_CMD_MAX + 1];
struct nlattr *attr = (void *)nlh + min_len;
struct sk_buff *skb = cb->skb;
struct ip_set_net *inst = ip_set_pernet(sock_net(skb->sk));
u32 dump_type;
int ret;
ret = nla_parse(cda, IPSET_ATTR_CMD_MAX, attr,
nlh->nlmsg_len - min_len,
ip_set_dump_policy, NULL);
if (ret)
goto error;
cb->args[IPSET_CB_PROTO] = nla_get_u8(cda[IPSET_ATTR_PROTOCOL]);
if (cda[IPSET_ATTR_SETNAME]) {
ip_set_id_t index;
struct ip_set *set;
set = find_set_and_id(inst, nla_data(cda[IPSET_ATTR_SETNAME]),
&index);
if (!set) {
ret = -ENOENT;
goto error;
}
dump_type = DUMP_ONE;
cb->args[IPSET_CB_INDEX] = index;
} else {
dump_type = DUMP_ALL;
}
if (cda[IPSET_ATTR_FLAGS]) {
u32 f = ip_set_get_h32(cda[IPSET_ATTR_FLAGS]);
dump_type |= (f << 16);
}
cb->args[IPSET_CB_NET] = (unsigned long)inst;
cb->args[IPSET_CB_DUMP] = dump_type;
return 0;
error:
/* We have to create and send the error message manually :-( */
if (nlh->nlmsg_flags & NLM_F_ACK) {
netlink_ack(cb->skb, nlh, ret, NULL);
}
return ret;
}
static int
ip_set_dump_do(struct sk_buff *skb, struct netlink_callback *cb)
{
ip_set_id_t index = IPSET_INVALID_ID, max;
struct ip_set *set = NULL;
struct nlmsghdr *nlh = NULL;
unsigned int flags = NETLINK_CB(cb->skb).portid ? NLM_F_MULTI : 0;
struct ip_set_net *inst = ip_set_pernet(sock_net(skb->sk));
u32 dump_type, dump_flags;
bool is_destroyed;
int ret = 0;
if (!cb->args[IPSET_CB_DUMP])
return -EINVAL;
if (cb->args[IPSET_CB_INDEX] >= inst->ip_set_max)
goto out;
dump_type = DUMP_TYPE(cb->args[IPSET_CB_DUMP]);
dump_flags = DUMP_FLAGS(cb->args[IPSET_CB_DUMP]);
max = dump_type == DUMP_ONE ? cb->args[IPSET_CB_INDEX] + 1
: inst->ip_set_max;
dump_last:
pr_debug("dump type, flag: %u %u index: %ld\n",
dump_type, dump_flags, cb->args[IPSET_CB_INDEX]);
for (; cb->args[IPSET_CB_INDEX] < max; cb->args[IPSET_CB_INDEX]++) {
index = (ip_set_id_t)cb->args[IPSET_CB_INDEX];
write_lock_bh(&ip_set_ref_lock);
set = ip_set(inst, index);
is_destroyed = inst->is_destroyed;
if (!set || is_destroyed) {
write_unlock_bh(&ip_set_ref_lock);
if (dump_type == DUMP_ONE) {
ret = -ENOENT;
goto out;
}
if (is_destroyed) {
/* All sets are just being destroyed */
ret = 0;
goto out;
}
continue;
}
/* When dumping all sets, we must dump "sorted"
* so that lists (unions of sets) are dumped last.
*/
if (dump_type != DUMP_ONE &&
((dump_type == DUMP_ALL) ==
!!(set->type->features & IPSET_DUMP_LAST))) {
write_unlock_bh(&ip_set_ref_lock);
continue;
}
pr_debug("List set: %s\n", set->name);
if (!cb->args[IPSET_CB_ARG0]) {
/* Start listing: make sure set won't be destroyed */
pr_debug("reference set\n");
set->ref_netlink++;
}
write_unlock_bh(&ip_set_ref_lock);
nlh = start_msg(skb, NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq, flags,
IPSET_CMD_LIST);
if (!nlh) {
ret = -EMSGSIZE;
goto release_refcount;
}
if (nla_put_u8(skb, IPSET_ATTR_PROTOCOL,
cb->args[IPSET_CB_PROTO]) ||
nla_put_string(skb, IPSET_ATTR_SETNAME, set->name))
goto nla_put_failure;
if (dump_flags & IPSET_FLAG_LIST_SETNAME)
goto next_set;
switch (cb->args[IPSET_CB_ARG0]) {
case 0:
/* Core header data */
if (nla_put_string(skb, IPSET_ATTR_TYPENAME,
set->type->name) ||
nla_put_u8(skb, IPSET_ATTR_FAMILY,
set->family) ||
nla_put_u8(skb, IPSET_ATTR_REVISION,
set->revision))
goto nla_put_failure;
if (cb->args[IPSET_CB_PROTO] > IPSET_PROTOCOL_MIN &&
nla_put_net16(skb, IPSET_ATTR_INDEX, htons(index)))
goto nla_put_failure;
ret = set->variant->head(set, skb);
if (ret < 0)
goto release_refcount;
if (dump_flags & IPSET_FLAG_LIST_HEADER)
goto next_set;
if (set->variant->uref)
set->variant->uref(set, cb, true);
fallthrough;
default:
ret = set->variant->list(set, skb, cb);
if (!cb->args[IPSET_CB_ARG0])
/* Set is done, proceed with next one */
goto next_set;
goto release_refcount;
}
}
/* If we dump all sets, continue with dumping last ones */
if (dump_type == DUMP_ALL) {
dump_type = DUMP_LAST;
cb->args[IPSET_CB_DUMP] = dump_type | (dump_flags << 16);
cb->args[IPSET_CB_INDEX] = 0;
if (set && set->variant->uref)
set->variant->uref(set, cb, false);
goto dump_last;
}
goto out;
nla_put_failure:
ret = -EFAULT;
next_set:
if (dump_type == DUMP_ONE)
cb->args[IPSET_CB_INDEX] = IPSET_INVALID_ID;
else
cb->args[IPSET_CB_INDEX]++;
release_refcount:
/* If there was an error or set is done, release set */
if (ret || !cb->args[IPSET_CB_ARG0]) {
set = ip_set_ref_netlink(inst, index);
if (set->variant->uref)
set->variant->uref(set, cb, false);
pr_debug("release set %s\n", set->name);
__ip_set_put_netlink(set);
cb->args[IPSET_CB_ARG0] = 0;
}
out:
if (nlh) {
nlmsg_end(skb, nlh);
pr_debug("nlmsg_len: %u\n", nlh->nlmsg_len);
dump_attrs(nlh);
}
return ret < 0 ? ret : skb->len;
}
static int ip_set_dump(struct sk_buff *skb, const struct nfnl_info *info,
const struct nlattr * const attr[])
{
if (unlikely(protocol_min_failed(attr)))
return -IPSET_ERR_PROTOCOL;
{
struct netlink_dump_control c = {
.start = ip_set_dump_start,
.dump = ip_set_dump_do,
.done = ip_set_dump_done,
};
return netlink_dump_start(info->sk, skb, info->nlh, &c);
}
}
/* Add, del and test */
static const struct nla_policy ip_set_adt_policy[IPSET_ATTR_CMD_MAX + 1] = {
[IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 },
[IPSET_ATTR_SETNAME] = { .type = NLA_NUL_STRING,
.len = IPSET_MAXNAMELEN - 1 },
[IPSET_ATTR_LINENO] = { .type = NLA_U32 },
[IPSET_ATTR_DATA] = { .type = NLA_NESTED },
[IPSET_ATTR_ADT] = { .type = NLA_NESTED },
};
static int
call_ad(struct net *net, struct sock *ctnl, struct sk_buff *skb,
struct ip_set *set, struct nlattr *tb[], enum ipset_adt adt,
u32 flags, bool use_lineno)
{
int ret;
u32 lineno = 0;
bool eexist = flags & IPSET_FLAG_EXIST, retried = false;
do {
if (retried) {
__ip_set_get_netlink(set);
nfnl_unlock(NFNL_SUBSYS_IPSET);
cond_resched();
nfnl_lock(NFNL_SUBSYS_IPSET);
__ip_set_put_netlink(set);
}
ip_set_lock(set);
ret = set->variant->uadt(set, tb, adt, &lineno, flags, retried);
ip_set_unlock(set);
retried = true;
} while (ret == -ERANGE ||
(ret == -EAGAIN &&
set->variant->resize &&
(ret = set->variant->resize(set, retried)) == 0));
if (!ret || (ret == -IPSET_ERR_EXIST && eexist))
return 0;
if (lineno && use_lineno) {
/* Error in restore/batch mode: send back lineno */
struct nlmsghdr *rep, *nlh = nlmsg_hdr(skb);
struct sk_buff *skb2;
struct nlmsgerr *errmsg;
size_t payload = min(SIZE_MAX,
sizeof(*errmsg) + nlmsg_len(nlh));
int min_len = nlmsg_total_size(sizeof(struct nfgenmsg));
struct nlattr *cda[IPSET_ATTR_CMD_MAX + 1];
struct nlattr *cmdattr;
u32 *errline;
skb2 = nlmsg_new(payload, GFP_KERNEL);
if (!skb2)
return -ENOMEM;
rep = nlmsg_put(skb2, NETLINK_CB(skb).portid,
nlh->nlmsg_seq, NLMSG_ERROR, payload, 0);
errmsg = nlmsg_data(rep);
errmsg->error = ret;
unsafe_memcpy(&errmsg->msg, nlh, nlh->nlmsg_len,
/* Bounds checked by the skb layer. */);
cmdattr = (void *)&errmsg->msg + min_len;
ret = nla_parse(cda, IPSET_ATTR_CMD_MAX, cmdattr,
nlh->nlmsg_len - min_len, ip_set_adt_policy,
NULL);
if (ret) {
nlmsg_free(skb2);
return ret;
}
errline = nla_data(cda[IPSET_ATTR_LINENO]);
*errline = lineno;
nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
/* Signal netlink not to send its ACK/errmsg. */
return -EINTR;
}
return ret;
}
static int ip_set_ad(struct net *net, struct sock *ctnl,
struct sk_buff *skb,
enum ipset_adt adt,
const struct nlmsghdr *nlh,
const struct nlattr * const attr[],
struct netlink_ext_ack *extack)
{
struct ip_set_net *inst = ip_set_pernet(net);
struct ip_set *set;
struct nlattr *tb[IPSET_ATTR_ADT_MAX + 1] = {};
const struct nlattr *nla;
u32 flags = flag_exist(nlh);
bool use_lineno;
int ret = 0;
if (unlikely(protocol_min_failed(attr) ||
!attr[IPSET_ATTR_SETNAME] ||
!((attr[IPSET_ATTR_DATA] != NULL) ^
(attr[IPSET_ATTR_ADT] != NULL)) ||
(attr[IPSET_ATTR_DATA] &&
!flag_nested(attr[IPSET_ATTR_DATA])) ||
(attr[IPSET_ATTR_ADT] &&
(!flag_nested(attr[IPSET_ATTR_ADT]) ||
!attr[IPSET_ATTR_LINENO]))))
return -IPSET_ERR_PROTOCOL;
set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME]));
if (!set)
return -ENOENT;
use_lineno = !!attr[IPSET_ATTR_LINENO];
if (attr[IPSET_ATTR_DATA]) {
if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX,
attr[IPSET_ATTR_DATA],
set->type->adt_policy, NULL))
return -IPSET_ERR_PROTOCOL;
ret = call_ad(net, ctnl, skb, set, tb, adt, flags,
use_lineno);
} else {
int nla_rem;
nla_for_each_nested(nla, attr[IPSET_ATTR_ADT], nla_rem) {
if (nla_type(nla) != IPSET_ATTR_DATA ||
!flag_nested(nla) ||
nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, nla,
set->type->adt_policy, NULL))
return -IPSET_ERR_PROTOCOL;
ret = call_ad(net, ctnl, skb, set, tb, adt,
flags, use_lineno);
if (ret < 0)
return ret;
}
}
return ret;
}
static int ip_set_uadd(struct sk_buff *skb, const struct nfnl_info *info,
const struct nlattr * const attr[])
{
return ip_set_ad(info->net, info->sk, skb,
IPSET_ADD, info->nlh, attr, info->extack);
}
static int ip_set_udel(struct sk_buff *skb, const struct nfnl_info *info,
const struct nlattr * const attr[])
{
return ip_set_ad(info->net, info->sk, skb,
IPSET_DEL, info->nlh, attr, info->extack);
}
static int ip_set_utest(struct sk_buff *skb, const struct nfnl_info *info,
const struct nlattr * const attr[])
{
struct ip_set_net *inst = ip_set_pernet(info->net);
struct ip_set *set;
struct nlattr *tb[IPSET_ATTR_ADT_MAX + 1] = {};
int ret = 0;
u32 lineno;
if (unlikely(protocol_min_failed(attr) ||
!attr[IPSET_ATTR_SETNAME] ||
!attr[IPSET_ATTR_DATA] ||
!flag_nested(attr[IPSET_ATTR_DATA])))
return -IPSET_ERR_PROTOCOL;
set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME]));
if (!set)
return -ENOENT;
if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, attr[IPSET_ATTR_DATA],
set->type->adt_policy, NULL))
return -IPSET_ERR_PROTOCOL;
rcu_read_lock_bh();
ret = set->variant->uadt(set, tb, IPSET_TEST, &lineno, 0, 0);
rcu_read_unlock_bh();
/* Userspace can't trigger element to be re-added */
if (ret == -EAGAIN)
ret = 1;
return ret > 0 ? 0 : -IPSET_ERR_EXIST;
}
/* Get headed data of a set */
static int ip_set_header(struct sk_buff *skb, const struct nfnl_info *info,
const struct nlattr * const attr[])
{
struct ip_set_net *inst = ip_set_pernet(info->net);
const struct ip_set *set;
struct sk_buff *skb2;
struct nlmsghdr *nlh2;
if (unlikely(protocol_min_failed(attr) ||
!attr[IPSET_ATTR_SETNAME]))
return -IPSET_ERR_PROTOCOL;
set = find_set(inst, nla_data(attr[IPSET_ATTR_SETNAME]));
if (!set)
return -ENOENT;
skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!skb2)
return -ENOMEM;
nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, info->nlh->nlmsg_seq, 0,
IPSET_CMD_HEADER);
if (!nlh2)
goto nlmsg_failure;
if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, protocol(attr)) ||
nla_put_string(skb2, IPSET_ATTR_SETNAME, set->name) ||
nla_put_string(skb2, IPSET_ATTR_TYPENAME, set->type->name) ||
nla_put_u8(skb2, IPSET_ATTR_FAMILY, set->family) ||
nla_put_u8(skb2, IPSET_ATTR_REVISION, set->revision))
goto nla_put_failure;
nlmsg_end(skb2, nlh2);
return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
nla_put_failure:
nlmsg_cancel(skb2, nlh2);
nlmsg_failure:
kfree_skb(skb2);
return -EMSGSIZE;
}
/* Get type data */
static const struct nla_policy ip_set_type_policy[IPSET_ATTR_CMD_MAX + 1] = {
[IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 },
[IPSET_ATTR_TYPENAME] = { .type = NLA_NUL_STRING,
.len = IPSET_MAXNAMELEN - 1 },
[IPSET_ATTR_FAMILY] = { .type = NLA_U8 },
};
static int ip_set_type(struct sk_buff *skb, const struct nfnl_info *info,
const struct nlattr * const attr[])
{
struct sk_buff *skb2;
struct nlmsghdr *nlh2;
u8 family, min, max;
const char *typename;
int ret = 0;
if (unlikely(protocol_min_failed(attr) ||
!attr[IPSET_ATTR_TYPENAME] ||
!attr[IPSET_ATTR_FAMILY]))
return -IPSET_ERR_PROTOCOL;
family = nla_get_u8(attr[IPSET_ATTR_FAMILY]);
typename = nla_data(attr[IPSET_ATTR_TYPENAME]);
ret = find_set_type_minmax(typename, family, &min, &max);
if (ret)
return ret;
skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!skb2)
return -ENOMEM;
nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, info->nlh->nlmsg_seq, 0,
IPSET_CMD_TYPE);
if (!nlh2)
goto nlmsg_failure;
if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, protocol(attr)) ||
nla_put_string(skb2, IPSET_ATTR_TYPENAME, typename) ||
nla_put_u8(skb2, IPSET_ATTR_FAMILY, family) ||
nla_put_u8(skb2, IPSET_ATTR_REVISION, max) ||
nla_put_u8(skb2, IPSET_ATTR_REVISION_MIN, min))
goto nla_put_failure;
nlmsg_end(skb2, nlh2);
pr_debug("Send TYPE, nlmsg_len: %u\n", nlh2->nlmsg_len);
return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
nla_put_failure:
nlmsg_cancel(skb2, nlh2);
nlmsg_failure:
kfree_skb(skb2);
return -EMSGSIZE;
}
/* Get protocol version */
static const struct nla_policy
ip_set_protocol_policy[IPSET_ATTR_CMD_MAX + 1] = {
[IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 },
};
static int ip_set_protocol(struct sk_buff *skb, const struct nfnl_info *info,
const struct nlattr * const attr[])
{
struct sk_buff *skb2;
struct nlmsghdr *nlh2;
if (unlikely(!attr[IPSET_ATTR_PROTOCOL]))
return -IPSET_ERR_PROTOCOL;
skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!skb2)
return -ENOMEM;
nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, info->nlh->nlmsg_seq, 0,
IPSET_CMD_PROTOCOL);
if (!nlh2)
goto nlmsg_failure;
if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, IPSET_PROTOCOL))
goto nla_put_failure;
if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL_MIN, IPSET_PROTOCOL_MIN))
goto nla_put_failure;
nlmsg_end(skb2, nlh2);
return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
nla_put_failure:
nlmsg_cancel(skb2, nlh2);
nlmsg_failure:
kfree_skb(skb2);
return -EMSGSIZE;
}
/* Get set by name or index, from userspace */
static int ip_set_byname(struct sk_buff *skb, const struct nfnl_info *info,
const struct nlattr * const attr[])
{
struct ip_set_net *inst = ip_set_pernet(info->net);
struct sk_buff *skb2;
struct nlmsghdr *nlh2;
ip_set_id_t id = IPSET_INVALID_ID;
const struct ip_set *set;
if (unlikely(protocol_failed(attr) ||
!attr[IPSET_ATTR_SETNAME]))
return -IPSET_ERR_PROTOCOL;
set = find_set_and_id(inst, nla_data(attr[IPSET_ATTR_SETNAME]), &id);
if (id == IPSET_INVALID_ID)
return -ENOENT;
skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!skb2)
return -ENOMEM;
nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, info->nlh->nlmsg_seq, 0,
IPSET_CMD_GET_BYNAME);
if (!nlh2)
goto nlmsg_failure;
if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, protocol(attr)) ||
nla_put_u8(skb2, IPSET_ATTR_FAMILY, set->family) ||
nla_put_net16(skb2, IPSET_ATTR_INDEX, htons(id)))
goto nla_put_failure;
nlmsg_end(skb2, nlh2);
return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
nla_put_failure:
nlmsg_cancel(skb2, nlh2);
nlmsg_failure:
kfree_skb(skb2);
return -EMSGSIZE;
}
static const struct nla_policy ip_set_index_policy[IPSET_ATTR_CMD_MAX + 1] = {
[IPSET_ATTR_PROTOCOL] = { .type = NLA_U8 },
[IPSET_ATTR_INDEX] = { .type = NLA_U16 },
};
static int ip_set_byindex(struct sk_buff *skb, const struct nfnl_info *info,
const struct nlattr * const attr[])
{
struct ip_set_net *inst = ip_set_pernet(info->net);
struct sk_buff *skb2;
struct nlmsghdr *nlh2;
ip_set_id_t id = IPSET_INVALID_ID;
const struct ip_set *set;
if (unlikely(protocol_failed(attr) ||
!attr[IPSET_ATTR_INDEX]))
return -IPSET_ERR_PROTOCOL;
id = ip_set_get_h16(attr[IPSET_ATTR_INDEX]);
if (id >= inst->ip_set_max)
return -ENOENT;
set = ip_set(inst, id);
if (set == NULL)
return -ENOENT;
skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!skb2)
return -ENOMEM;
nlh2 = start_msg(skb2, NETLINK_CB(skb).portid, info->nlh->nlmsg_seq, 0,
IPSET_CMD_GET_BYINDEX);
if (!nlh2)
goto nlmsg_failure;
if (nla_put_u8(skb2, IPSET_ATTR_PROTOCOL, protocol(attr)) ||
nla_put_string(skb2, IPSET_ATTR_SETNAME, set->name))
goto nla_put_failure;
nlmsg_end(skb2, nlh2);
return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
nla_put_failure:
nlmsg_cancel(skb2, nlh2);
nlmsg_failure:
kfree_skb(skb2);
return -EMSGSIZE;
}
static const struct nfnl_callback ip_set_netlink_subsys_cb[IPSET_MSG_MAX] = {
[IPSET_CMD_NONE] = {
.call = ip_set_none,
.type = NFNL_CB_MUTEX,
.attr_count = IPSET_ATTR_CMD_MAX,
},
[IPSET_CMD_CREATE] = {
.call = ip_set_create,
.type = NFNL_CB_MUTEX,
.attr_count = IPSET_ATTR_CMD_MAX,
.policy = ip_set_create_policy,
},
[IPSET_CMD_DESTROY] = {
.call = ip_set_destroy,
.type = NFNL_CB_MUTEX,
.attr_count = IPSET_ATTR_CMD_MAX,
.policy = ip_set_setname_policy,
},
[IPSET_CMD_FLUSH] = {
.call = ip_set_flush,
.type = NFNL_CB_MUTEX,
.attr_count = IPSET_ATTR_CMD_MAX,
.policy = ip_set_setname_policy,
},
[IPSET_CMD_RENAME] = {
.call = ip_set_rename,
.type = NFNL_CB_MUTEX,
.attr_count = IPSET_ATTR_CMD_MAX,
.policy = ip_set_setname2_policy,
},
[IPSET_CMD_SWAP] = {
.call = ip_set_swap,
.type = NFNL_CB_MUTEX,
.attr_count = IPSET_ATTR_CMD_MAX,
.policy = ip_set_setname2_policy,
},
[IPSET_CMD_LIST] = {
.call = ip_set_dump,
.type = NFNL_CB_MUTEX,
.attr_count = IPSET_ATTR_CMD_MAX,
.policy = ip_set_dump_policy,
},
[IPSET_CMD_SAVE] = {
.call = ip_set_dump,
.type = NFNL_CB_MUTEX,
.attr_count = IPSET_ATTR_CMD_MAX,
.policy = ip_set_setname_policy,
},
[IPSET_CMD_ADD] = {
.call = ip_set_uadd,
.type = NFNL_CB_MUTEX,
.attr_count = IPSET_ATTR_CMD_MAX,
.policy = ip_set_adt_policy,
},
[IPSET_CMD_DEL] = {
.call = ip_set_udel,
.type = NFNL_CB_MUTEX,
.attr_count = IPSET_ATTR_CMD_MAX,
.policy = ip_set_adt_policy,
},
[IPSET_CMD_TEST] = {
.call = ip_set_utest,
.type = NFNL_CB_MUTEX,
.attr_count = IPSET_ATTR_CMD_MAX,
.policy = ip_set_adt_policy,
},
[IPSET_CMD_HEADER] = {
.call = ip_set_header,
.type = NFNL_CB_MUTEX,
.attr_count = IPSET_ATTR_CMD_MAX,
.policy = ip_set_setname_policy,
},
[IPSET_CMD_TYPE] = {
.call = ip_set_type,
.type = NFNL_CB_MUTEX,
.attr_count = IPSET_ATTR_CMD_MAX,
.policy = ip_set_type_policy,
},
[IPSET_CMD_PROTOCOL] = {
.call = ip_set_protocol,
.type = NFNL_CB_MUTEX,
.attr_count = IPSET_ATTR_CMD_MAX,
.policy = ip_set_protocol_policy,
},
[IPSET_CMD_GET_BYNAME] = {
.call = ip_set_byname,
.type = NFNL_CB_MUTEX,
.attr_count = IPSET_ATTR_CMD_MAX,
.policy = ip_set_setname_policy,
},
[IPSET_CMD_GET_BYINDEX] = {
.call = ip_set_byindex,
.type = NFNL_CB_MUTEX,
.attr_count = IPSET_ATTR_CMD_MAX,
.policy = ip_set_index_policy,
},
};
static struct nfnetlink_subsystem ip_set_netlink_subsys __read_mostly = {
.name = "ip_set",
.subsys_id = NFNL_SUBSYS_IPSET,
.cb_count = IPSET_MSG_MAX,
.cb = ip_set_netlink_subsys_cb,
};
/* Interface to iptables/ip6tables */
static int
ip_set_sockfn_get(struct sock *sk, int optval, void __user *user, int *len)
{
unsigned int *op;
void *data;
int copylen = *len, ret = 0;
struct net *net = sock_net(sk);
struct ip_set_net *inst = ip_set_pernet(net);
if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
return -EPERM;
if (optval != SO_IP_SET)
return -EBADF;
if (*len < sizeof(unsigned int))
return -EINVAL;
data = vmalloc(*len);
if (!data)
return -ENOMEM;
if (copy_from_user(data, user, *len) != 0) {
ret = -EFAULT;
goto done;
}
op = data;
if (*op < IP_SET_OP_VERSION) {
/* Check the version at the beginning of operations */
struct ip_set_req_version *req_version = data;
if (*len < sizeof(struct ip_set_req_version)) {
ret = -EINVAL;
goto done;
}
if (req_version->version < IPSET_PROTOCOL_MIN) {
ret = -EPROTO;
goto done;
}
}
switch (*op) {
case IP_SET_OP_VERSION: {
struct ip_set_req_version *req_version = data;
if (*len != sizeof(struct ip_set_req_version)) {
ret = -EINVAL;
goto done;
}
req_version->version = IPSET_PROTOCOL;
if (copy_to_user(user, req_version,
sizeof(struct ip_set_req_version)))
ret = -EFAULT;
goto done;
}
case IP_SET_OP_GET_BYNAME: {
struct ip_set_req_get_set *req_get = data;
ip_set_id_t id;
if (*len != sizeof(struct ip_set_req_get_set)) {
ret = -EINVAL;
goto done;
}
req_get->set.name[IPSET_MAXNAMELEN - 1] = '\0';
nfnl_lock(NFNL_SUBSYS_IPSET);
find_set_and_id(inst, req_get->set.name, &id);
req_get->set.index = id;
nfnl_unlock(NFNL_SUBSYS_IPSET);
goto copy;
}
case IP_SET_OP_GET_FNAME: {
struct ip_set_req_get_set_family *req_get = data;
ip_set_id_t id;
if (*len != sizeof(struct ip_set_req_get_set_family)) {
ret = -EINVAL;
goto done;
}
req_get->set.name[IPSET_MAXNAMELEN - 1] = '\0';
nfnl_lock(NFNL_SUBSYS_IPSET);
find_set_and_id(inst, req_get->set.name, &id);
req_get->set.index = id;
if (id != IPSET_INVALID_ID)
req_get->family = ip_set(inst, id)->family;
nfnl_unlock(NFNL_SUBSYS_IPSET);
goto copy;
}
case IP_SET_OP_GET_BYINDEX: {
struct ip_set_req_get_set *req_get = data;
struct ip_set *set;
if (*len != sizeof(struct ip_set_req_get_set) ||
req_get->set.index >= inst->ip_set_max) {
ret = -EINVAL;
goto done;
}
nfnl_lock(NFNL_SUBSYS_IPSET);
set = ip_set(inst, req_get->set.index);
ret = strscpy(req_get->set.name, set ? set->name : "",
IPSET_MAXNAMELEN);
nfnl_unlock(NFNL_SUBSYS_IPSET);
if (ret < 0)
goto done;
goto copy;
}
default:
ret = -EBADMSG;
goto done;
} /* end of switch(op) */
copy:
if (copy_to_user(user, data, copylen))
ret = -EFAULT;
done:
vfree(data);
if (ret > 0)
ret = 0;
return ret;
}
static struct nf_sockopt_ops so_set __read_mostly = {
.pf = PF_INET,
.get_optmin = SO_IP_SET,
.get_optmax = SO_IP_SET + 1,
.get = ip_set_sockfn_get,
.owner = THIS_MODULE,
};
static int __net_init
ip_set_net_init(struct net *net)
{
struct ip_set_net *inst = ip_set_pernet(net);
struct ip_set **list;
inst->ip_set_max = max_sets ? max_sets : CONFIG_IP_SET_MAX;
if (inst->ip_set_max >= IPSET_INVALID_ID)
inst->ip_set_max = IPSET_INVALID_ID - 1;
list = kvcalloc(inst->ip_set_max, sizeof(struct ip_set *), GFP_KERNEL);
if (!list)
return -ENOMEM;
inst->is_deleted = false;
inst->is_destroyed = false;
rcu_assign_pointer(inst->ip_set_list, list);
return 0;
}
static void __net_exit
ip_set_net_pre_exit(struct net *net)
{
struct ip_set_net *inst = ip_set_pernet(net);
inst->is_deleted = true; /* flag for ip_set_nfnl_put */
}
static void __net_exit
ip_set_net_exit(struct net *net)
{
struct ip_set_net *inst = ip_set_pernet(net);
_destroy_all_sets(inst);
kvfree(rcu_dereference_protected(inst->ip_set_list, 1));
}
static struct pernet_operations ip_set_net_ops = {
.init = ip_set_net_init,
.pre_exit = ip_set_net_pre_exit,
.exit = ip_set_net_exit,
.id = &ip_set_net_id,
.size = sizeof(struct ip_set_net),
};
static int __init
ip_set_init(void)
{
int ret = register_pernet_subsys(&ip_set_net_ops);
if (ret) {
pr_err("ip_set: cannot register pernet_subsys.\n");
return ret;
}
ret = nfnetlink_subsys_register(&ip_set_netlink_subsys);
if (ret != 0) {
pr_err("ip_set: cannot register with nfnetlink.\n");
unregister_pernet_subsys(&ip_set_net_ops);
return ret;
}
ret = nf_register_sockopt(&so_set);
if (ret != 0) {
pr_err("SO_SET registry failed: %d\n", ret);
nfnetlink_subsys_unregister(&ip_set_netlink_subsys);
unregister_pernet_subsys(&ip_set_net_ops);
return ret;
}
return 0;
}
static void __exit
ip_set_fini(void)
{
nf_unregister_sockopt(&so_set);
nfnetlink_subsys_unregister(&ip_set_netlink_subsys);
unregister_pernet_subsys(&ip_set_net_ops);
/* Wait for call_rcu() in destroy */
rcu_barrier();
pr_debug("these are the famous last words\n");
}
module_init(ip_set_init);
module_exit(ip_set_fini);
MODULE_DESCRIPTION("ip_set: protocol " __stringify(IPSET_PROTOCOL));
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