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- // SPDX-License-Identifier: GPL-2.0-only
- /* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu>
- * Patrick Schaaf <bof@bof.de>
- * Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@netfilter.org>
- */
- /* 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 <kadlec@netfilter.org>");
- 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(p) \
- rcu_dereference_protected(p, \
- lockdep_nfnl_is_held(NFNL_SUBSYS_IPSET) || \
- lockdep_is_held(&ip_set_ref_lock))
- #define ip_set(inst, id) \
- ip_set_dereference((inst)->ip_set_list)[id]
- #define ip_set_ref_netlink(inst,id) \
- rcu_dereference_raw((inst)->ip_set_list)[id]
- /* 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;
- strlcpy(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_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 *set;
- struct ip_set_net *inst = ip_set_pernet(net);
- rcu_read_lock();
- /* ip_set_list itself needs to be protected */
- set = rcu_dereference(inst->ip_set_list)[index];
- rcu_read_unlock();
- return set;
- }
- 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;
- rcu_read_lock_bh();
- ret = set->variant->kadt(set, skb, par, IPSET_TEST, opt);
- rcu_read_unlock_bh();
- 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);
- strncpy(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)
- {
- struct nlmsghdr *nlh;
- struct nfgenmsg *nfmsg;
- nlh = nlmsg_put(skb, portid, seq, nfnl_msg_type(NFNL_SUBSYS_IPSET, cmd),
- sizeof(*nfmsg), flags);
- if (!nlh)
- return NULL;
- nfmsg = nlmsg_data(nlh);
- nfmsg->nfgen_family = NFPROTO_IPV4;
- nfmsg->version = NFNETLINK_V0;
- nfmsg->res_id = 0;
- return nlh;
- }
- /* 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 net *net, struct sock *ctnl, struct sk_buff *skb,
- const struct nlmsghdr *nlh,
- const struct nlattr * const attr[],
- struct netlink_ext_ack *extack)
- {
- return -EOPNOTSUPP;
- }
- static int ip_set_create(struct net *net, struct sock *ctnl,
- struct sk_buff *skb, 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, *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(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);
- strlcpy(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;
- }
- ret = set->type->create(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->ip_set_list);
- 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->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 },
- };
- static void
- ip_set_destroy_set(struct ip_set *set)
- {
- pr_debug("set: %s\n", set->name);
- /* Must call it without holding any lock */
- set->variant->destroy(set);
- module_put(set->type->me);
- kfree(set);
- }
- static int ip_set_destroy(struct net *net, struct sock *ctnl,
- struct sk_buff *skb, 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 *s;
- ip_set_id_t i;
- int ret = 0;
- if (unlikely(protocol_min_failed(attr)))
- return -IPSET_ERR_PROTOCOL;
- /* Must wait for flush to be really finished in list:set */
- rcu_barrier();
- /* Commands are serialized and references are
- * protected by the ip_set_ref_lock.
- * External systems (i.e. xt_set) must call
- * ip_set_put|get_nfnl_* 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.
- */
- read_lock_bh(&ip_set_ref_lock);
- if (!attr[IPSET_ATTR_SETNAME]) {
- 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);
- for (i = 0; i < inst->ip_set_max; i++) {
- s = ip_set(inst, i);
- if (s) {
- ip_set(inst, i) = NULL;
- ip_set_destroy_set(s);
- }
- }
- /* Modified by ip_set_destroy() only, which is serialized */
- inst->is_destroyed = false;
- } else {
- s = find_set_and_id(inst, nla_data(attr[IPSET_ATTR_SETNAME]),
- &i);
- if (!s) {
- ret = -ENOENT;
- goto out;
- } else if (s->ref || s->ref_netlink) {
- ret = -IPSET_ERR_BUSY;
- goto out;
- }
- ip_set(inst, i) = NULL;
- read_unlock_bh(&ip_set_ref_lock);
- ip_set_destroy_set(s);
- }
- 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 net *net, struct sock *ctnl, struct sk_buff *skb,
- 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 *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 net *net, struct sock *ctnl,
- struct sk_buff *skb, 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, *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;
- }
- }
- strncpy(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 net *net, struct sock *ctnl, struct sk_buff *skb,
- 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 *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;
- }
- strncpy(from_name, from->name, IPSET_MAXNAMELEN);
- strncpy(from->name, to->name, IPSET_MAXNAMELEN);
- strncpy(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 net *net, struct sock *ctnl, struct sk_buff *skb,
- const struct nlmsghdr *nlh,
- const struct nlattr * const attr[],
- struct netlink_ext_ack *extack)
- {
- 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(ctnl, skb, 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 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 {
- ip_set_lock(set);
- ret = set->variant->uadt(set, tb, adt, &lineno, flags, retried);
- ip_set_unlock(set);
- retried = true;
- } while (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;
- memcpy(&errmsg->msg, nlh, nlh->nlmsg_len);
- 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;
- netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid,
- MSG_DONTWAIT);
- /* 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(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(ctnl, skb, set, tb, adt,
- flags, use_lineno);
- if (ret < 0)
- return ret;
- }
- }
- return ret;
- }
- static int ip_set_uadd(struct net *net, struct sock *ctnl,
- struct sk_buff *skb, const struct nlmsghdr *nlh,
- const struct nlattr * const attr[],
- struct netlink_ext_ack *extack)
- {
- return ip_set_ad(net, ctnl, skb,
- IPSET_ADD, nlh, attr, extack);
- }
- static int ip_set_udel(struct net *net, struct sock *ctnl,
- struct sk_buff *skb, const struct nlmsghdr *nlh,
- const struct nlattr * const attr[],
- struct netlink_ext_ack *extack)
- {
- return ip_set_ad(net, ctnl, skb,
- IPSET_DEL, nlh, attr, extack);
- }
- static int ip_set_utest(struct net *net, struct sock *ctnl, struct sk_buff *skb,
- 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] = {};
- 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 net *net, struct sock *ctnl,
- struct sk_buff *skb, const struct nlmsghdr *nlh,
- const struct nlattr * const attr[],
- struct netlink_ext_ack *extack)
- {
- struct ip_set_net *inst = ip_set_pernet(net);
- const struct ip_set *set;
- struct sk_buff *skb2;
- struct nlmsghdr *nlh2;
- int ret = 0;
- 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, 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);
- ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
- if (ret < 0)
- return ret;
- return 0;
- 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 net *net, struct sock *ctnl, struct sk_buff *skb,
- const struct nlmsghdr *nlh,
- const struct nlattr * const attr[],
- struct netlink_ext_ack *extack)
- {
- 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, 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);
- ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
- if (ret < 0)
- return ret;
- return 0;
- 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 net *net, struct sock *ctnl,
- struct sk_buff *skb, const struct nlmsghdr *nlh,
- const struct nlattr * const attr[],
- struct netlink_ext_ack *extack)
- {
- struct sk_buff *skb2;
- struct nlmsghdr *nlh2;
- int ret = 0;
- 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, 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);
- ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
- if (ret < 0)
- return ret;
- return 0;
- 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 net *net, struct sock *ctnl,
- struct sk_buff *skb, const struct nlmsghdr *nlh,
- const struct nlattr * const attr[],
- struct netlink_ext_ack *extack)
- {
- struct ip_set_net *inst = ip_set_pernet(net);
- struct sk_buff *skb2;
- struct nlmsghdr *nlh2;
- ip_set_id_t id = IPSET_INVALID_ID;
- const struct ip_set *set;
- int ret = 0;
- 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, 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);
- ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
- if (ret < 0)
- return ret;
- return 0;
- 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 net *net, struct sock *ctnl,
- struct sk_buff *skb, const struct nlmsghdr *nlh,
- const struct nlattr * const attr[],
- struct netlink_ext_ack *extack)
- {
- struct ip_set_net *inst = ip_set_pernet(net);
- struct sk_buff *skb2;
- struct nlmsghdr *nlh2;
- ip_set_id_t id = IPSET_INVALID_ID;
- const struct ip_set *set;
- int ret = 0;
- 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, 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);
- ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
- if (ret < 0)
- return ret;
- return 0;
- 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,
- .attr_count = IPSET_ATTR_CMD_MAX,
- },
- [IPSET_CMD_CREATE] = {
- .call = ip_set_create,
- .attr_count = IPSET_ATTR_CMD_MAX,
- .policy = ip_set_create_policy,
- },
- [IPSET_CMD_DESTROY] = {
- .call = ip_set_destroy,
- .attr_count = IPSET_ATTR_CMD_MAX,
- .policy = ip_set_setname_policy,
- },
- [IPSET_CMD_FLUSH] = {
- .call = ip_set_flush,
- .attr_count = IPSET_ATTR_CMD_MAX,
- .policy = ip_set_setname_policy,
- },
- [IPSET_CMD_RENAME] = {
- .call = ip_set_rename,
- .attr_count = IPSET_ATTR_CMD_MAX,
- .policy = ip_set_setname2_policy,
- },
- [IPSET_CMD_SWAP] = {
- .call = ip_set_swap,
- .attr_count = IPSET_ATTR_CMD_MAX,
- .policy = ip_set_setname2_policy,
- },
- [IPSET_CMD_LIST] = {
- .call = ip_set_dump,
- .attr_count = IPSET_ATTR_CMD_MAX,
- .policy = ip_set_dump_policy,
- },
- [IPSET_CMD_SAVE] = {
- .call = ip_set_dump,
- .attr_count = IPSET_ATTR_CMD_MAX,
- .policy = ip_set_setname_policy,
- },
- [IPSET_CMD_ADD] = {
- .call = ip_set_uadd,
- .attr_count = IPSET_ATTR_CMD_MAX,
- .policy = ip_set_adt_policy,
- },
- [IPSET_CMD_DEL] = {
- .call = ip_set_udel,
- .attr_count = IPSET_ATTR_CMD_MAX,
- .policy = ip_set_adt_policy,
- },
- [IPSET_CMD_TEST] = {
- .call = ip_set_utest,
- .attr_count = IPSET_ATTR_CMD_MAX,
- .policy = ip_set_adt_policy,
- },
- [IPSET_CMD_HEADER] = {
- .call = ip_set_header,
- .attr_count = IPSET_ATTR_CMD_MAX,
- .policy = ip_set_setname_policy,
- },
- [IPSET_CMD_TYPE] = {
- .call = ip_set_type,
- .attr_count = IPSET_ATTR_CMD_MAX,
- .policy = ip_set_type_policy,
- },
- [IPSET_CMD_PROTOCOL] = {
- .call = ip_set_protocol,
- .attr_count = IPSET_ATTR_CMD_MAX,
- .policy = ip_set_protocol_policy,
- },
- [IPSET_CMD_GET_BYNAME] = {
- .call = ip_set_byname,
- .attr_count = IPSET_ATTR_CMD_MAX,
- .policy = ip_set_setname_policy,
- },
- [IPSET_CMD_GET_BYINDEX] = {
- .call = ip_set_byindex,
- .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_exit(struct net *net)
- {
- struct ip_set_net *inst = ip_set_pernet(net);
- struct ip_set *set = NULL;
- ip_set_id_t i;
- inst->is_deleted = true; /* flag for ip_set_nfnl_put */
- nfnl_lock(NFNL_SUBSYS_IPSET);
- for (i = 0; i < inst->ip_set_max; i++) {
- set = ip_set(inst, i);
- if (set) {
- ip_set(inst, i) = NULL;
- ip_set_destroy_set(set);
- }
- }
- nfnl_unlock(NFNL_SUBSYS_IPSET);
- kvfree(rcu_dereference_protected(inst->ip_set_list, 1));
- }
- static struct pernet_operations ip_set_net_ops = {
- .init = ip_set_net_init,
- .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);
- 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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