From: Jozsef Kadlecsik <kadlec@xxxxxxxxxxxxxxxxx>
The module implements the list:set type support in two flavours:
without and with timeout. The sets has two sides: for the userspace,
they store the names of other (non list:set type of) sets: one can add,
delete and test set names. For the kernel, it forms an ordered union of
the member sets: the members sets are tried in order when elements are
added, deleted and tested and the process stops at the first success.
Signed-off-by: Jozsef Kadlecsik <kadlec@xxxxxxxxxxxxxxxxx>
Signed-off-by: Patrick McHardy <kaber@xxxxxxxxx>
---
include/linux/netfilter/ipset/ip_set_list.h | 27 ++
net/netfilter/ipset/Kconfig | 10 +
net/netfilter/ipset/Makefile | 3 +
net/netfilter/ipset/ip_set_list_set.c | 584 +++++++++++++++++++++++++++
4 files changed, 624 insertions(+), 0 deletions(-)
create mode 100644 include/linux/netfilter/ipset/ip_set_list.h
create mode 100644 net/netfilter/ipset/ip_set_list_set.c
diff --git a/include/linux/netfilter/ipset/ip_set_list.h b/include/linux/netfilter/ipset/ip_set_list.h
new file mode 100644
index 0000000..40a63f3
--- /dev/null
+++ b/include/linux/netfilter/ipset/ip_set_list.h
@@ -0,0 +1,27 @@
+#ifndef __IP_SET_LIST_H
+#define __IP_SET_LIST_H
+
+/* List type specific error codes */
+enum {
+ /* Set name to be added/deleted/tested does not exist. */
+ IPSET_ERR_NAME = IPSET_ERR_TYPE_SPECIFIC,
+ /* list:set type is not permitted to add */
+ IPSET_ERR_LOOP,
+ /* Missing reference set */
+ IPSET_ERR_BEFORE,
+ /* Reference set does not exist */
+ IPSET_ERR_NAMEREF,
+ /* Set is full */
+ IPSET_ERR_LIST_FULL,
+ /* Reference set is not added to the set */
+ IPSET_ERR_REF_EXIST,
+};
+
+#ifdef __KERNEL__
+
+#define IP_SET_LIST_DEFAULT_SIZE 8
+#define IP_SET_LIST_MIN_SIZE 4
+
+#endif /* __KERNEL__ */
+
+#endif /* __IP_SET_LIST_H */
diff --git a/net/netfilter/ipset/Kconfig b/net/netfilter/ipset/Kconfig
index 2512e7b..3b970d3 100644
--- a/net/netfilter/ipset/Kconfig
+++ b/net/netfilter/ipset/Kconfig
@@ -108,4 +108,14 @@ config IP_SET_HASH_NETPORT
To compile it as a module, choose M here. If unsure, say N.
+config IP_SET_LIST_SET
+ tristate "list:set set support"
+ depends on IP_SET
+ help
+ This option adds the list:set set type support. In this
+ kind of set one can store the name of other sets and it forms
+ an ordered union of the member sets.
+
+ To compile it as a module, choose M here. If unsure, say N.
+
endif # IP_SET
diff --git a/net/netfilter/ipset/Makefile b/net/netfilter/ipset/Makefile
index fbbebd6..5adbdab 100644
--- a/net/netfilter/ipset/Makefile
+++ b/net/netfilter/ipset/Makefile
@@ -19,3 +19,6 @@ obj-$(CONFIG_IP_SET_HASH_IPPORTIP) += ip_set_hash_ipportip.o
obj-$(CONFIG_IP_SET_HASH_IPPORTNET) += ip_set_hash_ipportnet.o
obj-$(CONFIG_IP_SET_HASH_NET) += ip_set_hash_net.o
obj-$(CONFIG_IP_SET_HASH_NETPORT) += ip_set_hash_netport.o
+
+# list types
+obj-$(CONFIG_IP_SET_LIST_SET) += ip_set_list_set.o
diff --git a/net/netfilter/ipset/ip_set_list_set.c b/net/netfilter/ipset/ip_set_list_set.c
new file mode 100644
index 0000000..a47c329
--- /dev/null
+++ b/net/netfilter/ipset/ip_set_list_set.c
@@ -0,0 +1,584 @@
+/* Copyright (C) 2008-2011 Jozsef Kadlecsik <kadlec@xxxxxxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/* Kernel module implementing an IP set type: the list:set type */
+
+#include <linux/module.h>
+#include <linux/ip.h>
+#include <linux/skbuff.h>
+#include <linux/errno.h>
+
+#include <linux/netfilter/ipset/ip_set.h>
+#include <linux/netfilter/ipset/ip_set_timeout.h>
+#include <linux/netfilter/ipset/ip_set_list.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@xxxxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("list:set type of IP sets");
+MODULE_ALIAS("ip_set_list:set");
+
+/* Member elements without and with timeout */
+struct set_elem {
+ ip_set_id_t id;
+};
+
+struct set_telem {
+ ip_set_id_t id;
+ unsigned long timeout;
+};
+
+/* Type structure */
+struct list_set {
+ size_t dsize; /* element size */
+ u32 size; /* size of set list array */
+ u32 timeout; /* timeout value */
+ struct timer_list gc; /* garbage collection */
+ struct set_elem members[0]; /* the set members */
+};
+
+static inline struct set_elem *
+list_set_elem(const struct list_set *map, u32 id)
+{
+ return (struct set_elem *)((char *)map->members + id * map->dsize);
+}
+
+static inline bool
+list_set_timeout(const struct list_set *map, u32 id)
+{
+ const struct set_telem *elem =
+ (const struct set_telem *) list_set_elem(map, id);
+
+ return ip_set_timeout_test(elem->timeout);
+}
+
+static inline bool
+list_set_expired(const struct list_set *map, u32 id)
+{
+ const struct set_telem *elem =
+ (const struct set_telem *) list_set_elem(map, id);
+
+ return ip_set_timeout_expired(elem->timeout);
+}
+
+static inline int
+list_set_exist(const struct set_telem *elem)
+{
+ return elem->id != IPSET_INVALID_ID &&
+ !ip_set_timeout_expired(elem->timeout);
+}
+
+/* Set list without and with timeout */
+
+static int
+list_set_kadt(struct ip_set *set, const struct sk_buff *skb,
+ enum ipset_adt adt, u8 pf, u8 dim, u8 flags)
+{
+ struct list_set *map = set->data;
+ struct set_elem *elem;
+ u32 i;
+ int ret;
+
+ for (i = 0; i < map->size; i++) {
+ elem = list_set_elem(map, i);
+ if (elem->id == IPSET_INVALID_ID)
+ return 0;
+ if (with_timeout(map->timeout) && list_set_expired(map, i))
+ continue;
+ switch (adt) {
+ case IPSET_TEST:
+ ret = ip_set_test(elem->id, skb, pf, dim, flags);
+ if (ret > 0)
+ return ret;
+ break;
+ case IPSET_ADD:
+ ret = ip_set_add(elem->id, skb, pf, dim, flags);
+ if (ret == 0)
+ return ret;
+ break;
+ case IPSET_DEL:
+ ret = ip_set_del(elem->id, skb, pf, dim, flags);
+ if (ret == 0)
+ return ret;
+ break;
+ default:
+ break;
+ }
+ }
+ return -EINVAL;
+}
+
+static bool
+next_id_eq(const struct list_set *map, u32 i, ip_set_id_t id)
+{
+ const struct set_elem *elem;
+
+ if (i + 1 < map->size) {
+ elem = list_set_elem(map, i + 1);
+ return !!(elem->id == id &&
+ !(with_timeout(map->timeout) &&
+ list_set_expired(map, i + 1)));
+ }
+
+ return 0;
+}
+
+static void
+list_elem_add(struct list_set *map, u32 i, ip_set_id_t id)
+{
+ struct set_elem *e;
+
+ for (; i < map->size; i++) {
+ e = list_set_elem(map, i);
+ swap(e->id, id);
+ if (e->id == IPSET_INVALID_ID)
+ break;
+ }
+}
+
+static void
+list_elem_tadd(struct list_set *map, u32 i, ip_set_id_t id,
+ unsigned long timeout)
+{
+ struct set_telem *e;
+
+ for (; i < map->size; i++) {
+ e = (struct set_telem *)list_set_elem(map, i);
+ swap(e->id, id);
+ if (e->id == IPSET_INVALID_ID)
+ break;
+ swap(e->timeout, timeout);
+ }
+}
+
+static int
+list_set_add(struct list_set *map, u32 i, ip_set_id_t id,
+ unsigned long timeout)
+{
+ const struct set_elem *e = list_set_elem(map, i);
+
+ if (i == map->size - 1 && e->id != IPSET_INVALID_ID)
+ /* Last element replaced: e.g. add new,before,last */
+ ip_set_put_byindex(e->id);
+ if (with_timeout(map->timeout))
+ list_elem_tadd(map, i, id, timeout);
+ else
+ list_elem_add(map, i, id);
+
+ return 0;
+}
+
+static int
+list_set_del(struct list_set *map, ip_set_id_t id, u32 i)
+{
+ struct set_elem *a = list_set_elem(map, i), *b;
+
+ ip_set_put_byindex(id);
+
+ for (; i < map->size - 1; i++) {
+ b = list_set_elem(map, i + 1);
+ a->id = b->id;
+ if (with_timeout(map->timeout))
+ ((struct set_telem *)a)->timeout =
+ ((struct set_telem *)b)->timeout;
+ a = b;
+ if (a->id == IPSET_INVALID_ID)
+ break;
+ }
+ /* Last element */
+ a->id = IPSET_INVALID_ID;
+ return 0;
+}
+
+static int
+list_set_uadt(struct ip_set *set, struct nlattr *tb[],
+ enum ipset_adt adt, u32 *lineno, u32 flags)
+{
+ struct list_set *map = set->data;
+ bool with_timeout = with_timeout(map->timeout);
+ int before = 0;
+ u32 timeout = map->timeout;
+ ip_set_id_t id, refid = IPSET_INVALID_ID;
+ const struct set_elem *elem;
+ struct ip_set *s;
+ u32 i;
+ int ret = 0;
+
+ if (unlikely(!tb[IPSET_ATTR_NAME] ||
+ !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
+ !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
+ return -IPSET_ERR_PROTOCOL;
+
+ if (tb[IPSET_ATTR_LINENO])
+ *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
+
+ id = ip_set_get_byname(nla_data(tb[IPSET_ATTR_NAME]), &s);
+ if (id == IPSET_INVALID_ID)
+ return -IPSET_ERR_NAME;
+ /* "Loop detection" */
+ if (s->type->features & IPSET_TYPE_NAME) {
+ ret = -IPSET_ERR_LOOP;
+ goto finish;
+ }
+
+ if (tb[IPSET_ATTR_CADT_FLAGS]) {
+ u32 f = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
+ before = f & IPSET_FLAG_BEFORE;
+ }
+
+ if (before && !tb[IPSET_ATTR_NAMEREF]) {
+ ret = -IPSET_ERR_BEFORE;
+ goto finish;
+ }
+
+ if (tb[IPSET_ATTR_NAMEREF]) {
+ refid = ip_set_get_byname(nla_data(tb[IPSET_ATTR_NAMEREF]),
+ &s);
+ if (refid == IPSET_INVALID_ID) {
+ ret = -IPSET_ERR_NAMEREF;
+ goto finish;
+ }
+ if (!before)
+ before = -1;
+ }
+ if (tb[IPSET_ATTR_TIMEOUT]) {
+ if (!with_timeout) {
+ ret = -IPSET_ERR_TIMEOUT;
+ goto finish;
+ }
+ timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
+ }
+
+ switch (adt) {
+ case IPSET_TEST:
+ for (i = 0; i < map->size && !ret; i++) {
+ elem = list_set_elem(map, i);
+ if (elem->id == IPSET_INVALID_ID ||
+ (before != 0 && i + 1 >= map->size))
+ break;
+ else if (with_timeout && list_set_expired(map, i))
+ continue;
+ else if (before > 0 && elem->id == id)
+ ret = next_id_eq(map, i, refid);
+ else if (before < 0 && elem->id == refid)
+ ret = next_id_eq(map, i, id);
+ else if (before == 0 && elem->id == id)
+ ret = 1;
+ }
+ break;
+ case IPSET_ADD:
+ for (i = 0; i < map->size && !ret; i++) {
+ elem = list_set_elem(map, i);
+ if (elem->id == id &&
+ !(with_timeout && list_set_expired(map, i)))
+ ret = -IPSET_ERR_EXIST;
+ }
+ if (ret == -IPSET_ERR_EXIST)
+ break;
+ ret = -IPSET_ERR_LIST_FULL;
+ for (i = 0; i < map->size && ret == -IPSET_ERR_LIST_FULL; i++) {
+ elem = list_set_elem(map, i);
+ if (elem->id == IPSET_INVALID_ID)
+ ret = before != 0 ? -IPSET_ERR_REF_EXIST
+ : list_set_add(map, i, id, timeout);
+ else if (elem->id != refid)
+ continue;
+ else if (with_timeout && list_set_expired(map, i))
+ ret = -IPSET_ERR_REF_EXIST;
+ else if (before)
+ ret = list_set_add(map, i, id, timeout);
+ else if (i + 1 < map->size)
+ ret = list_set_add(map, i + 1, id, timeout);
+ }
+ break;
+ case IPSET_DEL:
+ ret = -IPSET_ERR_EXIST;
+ for (i = 0; i < map->size && ret == -IPSET_ERR_EXIST; i++) {
+ elem = list_set_elem(map, i);
+ if (elem->id == IPSET_INVALID_ID) {
+ ret = before != 0 ? -IPSET_ERR_REF_EXIST
+ : -IPSET_ERR_EXIST;
+ break;
+ } else if (with_timeout && list_set_expired(map, i))
+ continue;
+ else if (elem->id == id &&
+ (before == 0 ||
+ (before > 0 &&
+ next_id_eq(map, i, refid))))
+ ret = list_set_del(map, id, i);
+ else if (before < 0 &&
+ elem->id == refid &&
+ next_id_eq(map, i, id))
+ ret = list_set_del(map, id, i + 1);
+ }
+ break;
+ default:
+ break;
+ }
+
+finish:
+ if (refid != IPSET_INVALID_ID)
+ ip_set_put_byindex(refid);
+ if (adt != IPSET_ADD || ret)
+ ip_set_put_byindex(id);
+
+ return ip_set_eexist(ret, flags) ? 0 : ret;
+}
+
+static void
+list_set_flush(struct ip_set *set)
+{
+ struct list_set *map = set->data;
+ struct set_elem *elem;
+ u32 i;
+
+ for (i = 0; i < map->size; i++) {
+ elem = list_set_elem(map, i);
+ if (elem->id != IPSET_INVALID_ID) {
+ ip_set_put_byindex(elem->id);
+ elem->id = IPSET_INVALID_ID;
+ }
+ }
+}
+
+static void
+list_set_destroy(struct ip_set *set)
+{
+ struct list_set *map = set->data;
+
+ if (with_timeout(map->timeout))
+ del_timer_sync(&map->gc);
+ list_set_flush(set);
+ kfree(map);
+
+ set->data = NULL;
+}
+
+static int
+list_set_head(struct ip_set *set, struct sk_buff *skb)
+{
+ const struct list_set *map = set->data;
+ struct nlattr *nested;
+
+ nested = ipset_nest_start(skb, IPSET_ATTR_DATA);
+ if (!nested)
+ goto nla_put_failure;
+ NLA_PUT_NET32(skb, IPSET_ATTR_SIZE, htonl(map->size));
+ if (with_timeout(map->timeout))
+ NLA_PUT_NET32(skb, IPSET_ATTR_TIMEOUT, htonl(map->timeout));
+ NLA_PUT_NET32(skb, IPSET_ATTR_REFERENCES,
+ htonl(atomic_read(&set->ref) - 1));
+ NLA_PUT_NET32(skb, IPSET_ATTR_MEMSIZE,
+ htonl(sizeof(*map) + map->size * map->dsize));
+ ipset_nest_end(skb, nested);
+
+ return 0;
+nla_put_failure:
+ return -EMSGSIZE;
+}
+
+static int
+list_set_list(const struct ip_set *set,
+ struct sk_buff *skb, struct netlink_callback *cb)
+{
+ const struct list_set *map = set->data;
+ struct nlattr *atd, *nested;
+ u32 i, first = cb->args[2];
+ const struct set_elem *e;
+
+ atd = ipset_nest_start(skb, IPSET_ATTR_ADT);
+ if (!atd)
+ return -EMSGSIZE;
+ for (; cb->args[2] < map->size; cb->args[2]++) {
+ i = cb->args[2];
+ e = list_set_elem(map, i);
+ if (e->id == IPSET_INVALID_ID)
+ goto finish;
+ if (with_timeout(map->timeout) && list_set_expired(map, i))
+ continue;
+ nested = ipset_nest_start(skb, IPSET_ATTR_DATA);
+ if (!nested) {
+ if (i == first) {
+ nla_nest_cancel(skb, atd);
+ return -EMSGSIZE;
+ } else
+ goto nla_put_failure;
+ }
+ NLA_PUT_STRING(skb, IPSET_ATTR_NAME,
+ ip_set_name_byindex(e->id));
+ if (with_timeout(map->timeout)) {
+ const struct set_telem *te =
+ (const struct set_telem *) e;
+ NLA_PUT_NET32(skb, IPSET_ATTR_TIMEOUT,
+ htonl(ip_set_timeout_get(te->timeout)));
+ }
+ ipset_nest_end(skb, nested);
+ }
+finish:
+ ipset_nest_end(skb, atd);
+ /* Set listing finished */
+ cb->args[2] = 0;
+ return 0;
+
+nla_put_failure:
+ nla_nest_cancel(skb, nested);
+ ipset_nest_end(skb, atd);
+ if (unlikely(i == first)) {
+ cb->args[2] = 0;
+ return -EMSGSIZE;
+ }
+ return 0;
+}
+
+static bool
+list_set_same_set(const struct ip_set *a, const struct ip_set *b)
+{
+ const struct list_set *x = a->data;
+ const struct list_set *y = b->data;
+
+ return x->size == y->size &&
+ x->timeout == y->timeout;
+}
+
+static const struct ip_set_type_variant list_set = {
+ .kadt = list_set_kadt,
+ .uadt = list_set_uadt,
+ .destroy = list_set_destroy,
+ .flush = list_set_flush,
+ .head = list_set_head,
+ .list = list_set_list,
+ .same_set = list_set_same_set,
+};
+
+static void
+list_set_gc(unsigned long ul_set)
+{
+ struct ip_set *set = (struct ip_set *) ul_set;
+ struct list_set *map = set->data;
+ struct set_telem *e;
+ u32 i;
+
+ /* We run parallel with other readers (test element)
+ * but adding/deleting new entries is locked out */
+ read_lock_bh(&set->lock);
+ for (i = map->size - 1; i >= 0; i--) {
+ e = (struct set_telem *) list_set_elem(map, i);
+ if (e->id != IPSET_INVALID_ID &&
+ list_set_expired(map, i))
+ list_set_del(map, e->id, i);
+ }
+ read_unlock_bh(&set->lock);
+
+ map->gc.expires = jiffies + IPSET_GC_PERIOD(map->timeout) * HZ;
+ add_timer(&map->gc);
+}
+
+static void
+list_set_gc_init(struct ip_set *set)
+{
+ struct list_set *map = set->data;
+
+ init_timer(&map->gc);
+ map->gc.data = (unsigned long) set;
+ map->gc.function = list_set_gc;
+ map->gc.expires = jiffies + IPSET_GC_PERIOD(map->timeout) * HZ;
+ add_timer(&map->gc);
+}
+
+/* Create list:set type of sets */
+
+static bool
+init_list_set(struct ip_set *set, u32 size, size_t dsize,
+ unsigned long timeout)
+{
+ struct list_set *map;
+ struct set_elem *e;
+ u32 i;
+
+ map = kzalloc(sizeof(*map) + size * dsize, GFP_KERNEL);
+ if (!map)
+ return false;
+
+ map->size = size;
+ map->dsize = dsize;
+ map->timeout = timeout;
+ set->data = map;
+
+ for (i = 0; i < size; i++) {
+ e = list_set_elem(map, i);
+ e->id = IPSET_INVALID_ID;
+ }
+
+ return true;
+}
+
+static int
+list_set_create(struct ip_set *set, struct nlattr *tb[], u32 flags)
+{
+ u32 size = IP_SET_LIST_DEFAULT_SIZE;
+
+ if (unlikely(!ip_set_optattr_netorder(tb, IPSET_ATTR_SIZE) ||
+ !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT)))
+ return -IPSET_ERR_PROTOCOL;
+
+ if (tb[IPSET_ATTR_SIZE])
+ size = ip_set_get_h32(tb[IPSET_ATTR_SIZE]);
+ if (size < IP_SET_LIST_MIN_SIZE)
+ size = IP_SET_LIST_MIN_SIZE;
+
+ if (tb[IPSET_ATTR_TIMEOUT]) {
+ if (!init_list_set(set, size, sizeof(struct set_telem),
+ ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT])))
+ return -ENOMEM;
+
+ list_set_gc_init(set);
+ } else {
+ if (!init_list_set(set, size, sizeof(struct set_elem),
+ IPSET_NO_TIMEOUT))
+ return -ENOMEM;
+ }
+ set->variant = &list_set;
+ return 0;
+}
+
+static struct ip_set_type list_set_type __read_mostly = {
+ .name = "list:set",
+ .protocol = IPSET_PROTOCOL,
+ .features = IPSET_TYPE_NAME | IPSET_DUMP_LAST,
+ .dimension = IPSET_DIM_ONE,
+ .family = AF_UNSPEC,
+ .revision = 0,
+ .create = list_set_create,
+ .create_policy = {
+ [IPSET_ATTR_SIZE] = { .type = NLA_U32 },
+ [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
+ },
+ .adt_policy = {
+ [IPSET_ATTR_NAME] = { .type = NLA_STRING,
+ .len = IPSET_MAXNAMELEN },
+ [IPSET_ATTR_NAMEREF] = { .type = NLA_STRING,
+ .len = IPSET_MAXNAMELEN },
+ [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
+ [IPSET_ATTR_LINENO] = { .type = NLA_U32 },
+ [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
+ },
+ .me = THIS_MODULE,
+};
+
+static int __init
+list_set_init(void)
+{
+ return ip_set_type_register(&list_set_type);
+}
+
+static void __exit
+list_set_fini(void)
+{
+ ip_set_type_unregister(&list_set_type);
+}
+
+module_init(list_set_init);
+module_exit(list_set_fini);
--
1.7.2.3
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