--- /dev/null
+/* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu>
+ * Patrick Schaaf <bof@bof.de>
+ * Copyright (C) 2003-2004 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
+ *
+ * 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 single bitmap type */
+
+#include <linux/module.h>
+#include <linux/ip.h>
+#include <linux/skbuff.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ip_set.h>
+#include <linux/errno.h>
+#include <asm/uaccess.h>
+#include <asm/bitops.h>
+#include <linux/spinlock.h>
+
+#include <linux/netfilter_ipv4/ip_set_ipmap.h>
+
+static inline ip_set_ip_t
+ip_to_id(const struct ip_set_ipmap *map, ip_set_ip_t ip)
+{
+ return (ip - map->first_ip)/map->hosts;
+}
+
+static inline int
+__testip(struct ip_set *set, ip_set_ip_t ip, ip_set_ip_t *hash_ip)
+{
+ struct ip_set_ipmap *map = (struct ip_set_ipmap *) set->data;
+
+ if (ip < map->first_ip || ip > map->last_ip)
+ return -ERANGE;
+
+ *hash_ip = ip & map->netmask;
+ DP("set: %s, ip:%u.%u.%u.%u, %u.%u.%u.%u",
+ set->name, HIPQUAD(ip), HIPQUAD(*hash_ip));
+ return !!test_bit(ip_to_id(map, *hash_ip), map->members);
+}
+
+static int
+testip(struct ip_set *set, const void *data, size_t size,
+ ip_set_ip_t *hash_ip)
+{
+ struct ip_set_req_ipmap *req =
+ (struct ip_set_req_ipmap *) data;
+
+ if (size != sizeof(struct ip_set_req_ipmap)) {
+ ip_set_printk("data length wrong (want %zu, have %zu)",
+ sizeof(struct ip_set_req_ipmap),
+ size);
+ return -EINVAL;
+ }
+ return __testip(set, req->ip, hash_ip);
+}
+
+static int
+testip_kernel(struct ip_set *set,
+ const struct sk_buff *skb,
+ ip_set_ip_t *hash_ip,
+ const u_int32_t *flags,
+ unsigned char index)
+{
+ int res;
+
+ DP("flag: %s src: %u.%u.%u.%u dst: %u.%u.%u.%u",
+ flags[index] & IPSET_SRC ? "SRC" : "DST",
+ NIPQUAD(skb->nh.iph->saddr),
+ NIPQUAD(skb->nh.iph->daddr));
+
+ res = __testip(set,
+ ntohl(flags[index] & IPSET_SRC
+ ? skb->nh.iph->saddr
+ : skb->nh.iph->daddr),
+ hash_ip);
+ return (res < 0 ? 0 : res);
+}
+
+static inline int
+__addip(struct ip_set *set, ip_set_ip_t ip, ip_set_ip_t *hash_ip)
+{
+ struct ip_set_ipmap *map = (struct ip_set_ipmap *) set->data;
+
+ if (ip < map->first_ip || ip > map->last_ip)
+ return -ERANGE;
+
+ *hash_ip = ip & map->netmask;
+ DP("%u.%u.%u.%u, %u.%u.%u.%u", HIPQUAD(ip), HIPQUAD(*hash_ip));
+ if (test_and_set_bit(ip_to_id(map, *hash_ip), map->members))
+ return -EEXIST;
+
+ return 0;
+}
+
+static int
+addip(struct ip_set *set, const void *data, size_t size,
+ ip_set_ip_t *hash_ip)
+{
+ struct ip_set_req_ipmap *req =
+ (struct ip_set_req_ipmap *) data;
+
+ if (size != sizeof(struct ip_set_req_ipmap)) {
+ ip_set_printk("data length wrong (want %zu, have %zu)",
+ sizeof(struct ip_set_req_ipmap),
+ size);
+ return -EINVAL;
+ }
+ DP("%u.%u.%u.%u", HIPQUAD(req->ip));
+ return __addip(set, req->ip, hash_ip);
+}
+
+static int
+addip_kernel(struct ip_set *set,
+ const struct sk_buff *skb,
+ ip_set_ip_t *hash_ip,
+ const u_int32_t *flags,
+ unsigned char index)
+{
+ return __addip(set,
+ ntohl(flags[index] & IPSET_SRC
+ ? skb->nh.iph->saddr
+ : skb->nh.iph->daddr),
+ hash_ip);
+}
+
+static inline int
+__delip(struct ip_set *set, ip_set_ip_t ip, ip_set_ip_t *hash_ip)
+{
+ struct ip_set_ipmap *map = (struct ip_set_ipmap *) set->data;
+
+ if (ip < map->first_ip || ip > map->last_ip)
+ return -ERANGE;
+
+ *hash_ip = ip & map->netmask;
+ DP("%u.%u.%u.%u, %u.%u.%u.%u", HIPQUAD(ip), HIPQUAD(*hash_ip));
+ if (!test_and_clear_bit(ip_to_id(map, *hash_ip), map->members))
+ return -EEXIST;
+
+ return 0;
+}
+
+static int
+delip(struct ip_set *set, const void *data, size_t size,
+ ip_set_ip_t *hash_ip)
+{
+ struct ip_set_req_ipmap *req =
+ (struct ip_set_req_ipmap *) data;
+
+ if (size != sizeof(struct ip_set_req_ipmap)) {
+ ip_set_printk("data length wrong (want %zu, have %zu)",
+ sizeof(struct ip_set_req_ipmap),
+ size);
+ return -EINVAL;
+ }
+ return __delip(set, req->ip, hash_ip);
+}
+
+static int
+delip_kernel(struct ip_set *set,
+ const struct sk_buff *skb,
+ ip_set_ip_t *hash_ip,
+ const u_int32_t *flags,
+ unsigned char index)
+{
+ return __delip(set,
+ ntohl(flags[index] & IPSET_SRC
+ ? skb->nh.iph->saddr
+ : skb->nh.iph->daddr),
+ hash_ip);
+}
+
+static int create(struct ip_set *set, const void *data, size_t size)
+{
+ int newbytes;
+ struct ip_set_req_ipmap_create *req =
+ (struct ip_set_req_ipmap_create *) data;
+ struct ip_set_ipmap *map;
+
+ if (size != sizeof(struct ip_set_req_ipmap_create)) {
+ ip_set_printk("data length wrong (want %zu, have %zu)",
+ sizeof(struct ip_set_req_ipmap_create),
+ size);
+ return -EINVAL;
+ }
+
+ DP("from %u.%u.%u.%u to %u.%u.%u.%u",
+ HIPQUAD(req->from), HIPQUAD(req->to));
+
+ if (req->from > req->to) {
+ DP("bad ip range");
+ return -ENOEXEC;
+ }
+
+ map = kmalloc(sizeof(struct ip_set_ipmap), GFP_KERNEL);
+ if (!map) {
+ DP("out of memory for %d bytes",
+ sizeof(struct ip_set_ipmap));
+ return -ENOMEM;
+ }
+ map->first_ip = req->from;
+ map->last_ip = req->to;
+ map->netmask = req->netmask;
+
+ if (req->netmask == 0xFFFFFFFF) {
+ map->hosts = 1;
+ map->sizeid = map->last_ip - map->first_ip + 1;
+ } else {
+ unsigned int mask_bits, netmask_bits;
+ ip_set_ip_t mask;
+
+ map->first_ip &= map->netmask; /* Should we better bark? */
+
+ mask = range_to_mask(map->first_ip, map->last_ip, &mask_bits);
+ netmask_bits = mask_to_bits(map->netmask);
+
+ if ((!mask && (map->first_ip || map->last_ip != 0xFFFFFFFF))
+ || netmask_bits <= mask_bits)
+ return -ENOEXEC;
+
+ DP("mask_bits %u, netmask_bits %u",
+ mask_bits, netmask_bits);
+ map->hosts = 2 << (32 - netmask_bits - 1);
+ map->sizeid = 2 << (netmask_bits - mask_bits - 1);
+ }
+ if (map->sizeid > MAX_RANGE + 1) {
+ ip_set_printk("range too big (max %d addresses)",
+ MAX_RANGE+1);
+ kfree(map);
+ return -ENOEXEC;
+ }
+ DP("hosts %u, sizeid %u", map->hosts, map->sizeid);
+ newbytes = bitmap_bytes(0, map->sizeid - 1);
+ map->members = kmalloc(newbytes, GFP_KERNEL);
+ if (!map->members) {
+ DP("out of memory for %d bytes", newbytes);
+ kfree(map);
+ return -ENOMEM;
+ }
+ memset(map->members, 0, newbytes);
+
+ set->data = map;
+ return 0;
+}
+
+static void destroy(struct ip_set *set)
+{
+ struct ip_set_ipmap *map = (struct ip_set_ipmap *) set->data;
+
+ kfree(map->members);
+ kfree(map);
+
+ set->data = NULL;
+}
+
+static void flush(struct ip_set *set)
+{
+ struct ip_set_ipmap *map = (struct ip_set_ipmap *) set->data;
+ memset(map->members, 0, bitmap_bytes(0, map->sizeid - 1));
+}
+
+static void list_header(const struct ip_set *set, void *data)
+{
+ struct ip_set_ipmap *map = (struct ip_set_ipmap *) set->data;
+ struct ip_set_req_ipmap_create *header =
+ (struct ip_set_req_ipmap_create *) data;
+
+ header->from = map->first_ip;
+ header->to = map->last_ip;
+ header->netmask = map->netmask;
+}
+
+static int list_members_size(const struct ip_set *set)
+{
+ struct ip_set_ipmap *map = (struct ip_set_ipmap *) set->data;
+
+ return bitmap_bytes(0, map->sizeid - 1);
+}
+
+static void list_members(const struct ip_set *set, void *data)
+{
+ struct ip_set_ipmap *map = (struct ip_set_ipmap *) set->data;
+ int bytes = bitmap_bytes(0, map->sizeid - 1);
+
+ memcpy(data, map->members, bytes);
+}
+
+static struct ip_set_type ip_set_ipmap = {
+ .typename = SETTYPE_NAME,
+ .features = IPSET_TYPE_IP | IPSET_DATA_SINGLE,
+ .protocol_version = IP_SET_PROTOCOL_VERSION,
+ .create = &create,
+ .destroy = &destroy,
+ .flush = &flush,
+ .reqsize = sizeof(struct ip_set_req_ipmap),
+ .addip = &addip,
+ .addip_kernel = &addip_kernel,
+ .delip = &delip,
+ .delip_kernel = &delip_kernel,
+ .testip = &testip,
+ .testip_kernel = &testip_kernel,
+ .header_size = sizeof(struct ip_set_req_ipmap_create),
+ .list_header = &list_header,
+ .list_members_size = &list_members_size,
+ .list_members = &list_members,
+ .me = THIS_MODULE,
+};
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
+MODULE_DESCRIPTION("ipmap type of IP sets");
+
+static int __init init(void)
+{
+ return ip_set_register_set_type(&ip_set_ipmap);
+}
+
+static void __exit fini(void)
+{
+ /* FIXME: possible race with ip_set_create() */
+ ip_set_unregister_set_type(&ip_set_ipmap);
+}
+
+module_init(init);
+module_exit(fini);
git://git.onelab.eu / linux-2.6.git / blobdiff