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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 implementing an IP set type: the bitmap:ip type */
- #include <linux/module.h>
- #include <linux/ip.h>
- #include <linux/skbuff.h>
- #include <linux/errno.h>
- #include <linux/bitops.h>
- #include <linux/spinlock.h>
- #include <linux/netlink.h>
- #include <linux/jiffies.h>
- #include <linux/timer.h>
- #include <net/netlink.h>
- #include <net/tcp.h>
- #include <linux/netfilter/ipset/pfxlen.h>
- #include <linux/netfilter/ipset/ip_set.h>
- #include <linux/netfilter/ipset/ip_set_bitmap.h>
- #define IPSET_TYPE_REV_MIN 0
- /* 1 Counter support added */
- /* 2 Comment support added */
- #define IPSET_TYPE_REV_MAX 3 /* skbinfo support added */
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@netfilter.org>");
- IP_SET_MODULE_DESC("bitmap:ip", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
- MODULE_ALIAS("ip_set_bitmap:ip");
- #define MTYPE bitmap_ip
- #define HOST_MASK 32
- /* Type structure */
- struct bitmap_ip {
- unsigned long *members; /* the set members */
- u32 first_ip; /* host byte order, included in range */
- u32 last_ip; /* host byte order, included in range */
- u32 elements; /* number of max elements in the set */
- u32 hosts; /* number of hosts in a subnet */
- size_t memsize; /* members size */
- u8 netmask; /* subnet netmask */
- struct timer_list gc; /* garbage collection */
- struct ip_set *set; /* attached to this ip_set */
- unsigned char extensions[] /* data extensions */
- __aligned(__alignof__(u64));
- };
- /* ADT structure for generic function args */
- struct bitmap_ip_adt_elem {
- u16 id;
- };
- static u32
- ip_to_id(const struct bitmap_ip *m, u32 ip)
- {
- return ((ip & ip_set_hostmask(m->netmask)) - m->first_ip) / m->hosts;
- }
- /* Common functions */
- static int
- bitmap_ip_do_test(const struct bitmap_ip_adt_elem *e,
- struct bitmap_ip *map, size_t dsize)
- {
- return !!test_bit(e->id, map->members);
- }
- static int
- bitmap_ip_gc_test(u16 id, const struct bitmap_ip *map, size_t dsize)
- {
- return !!test_bit(id, map->members);
- }
- static int
- bitmap_ip_do_add(const struct bitmap_ip_adt_elem *e, struct bitmap_ip *map,
- u32 flags, size_t dsize)
- {
- return !!test_bit(e->id, map->members);
- }
- static int
- bitmap_ip_do_del(const struct bitmap_ip_adt_elem *e, struct bitmap_ip *map)
- {
- return !test_and_clear_bit(e->id, map->members);
- }
- static int
- bitmap_ip_do_list(struct sk_buff *skb, const struct bitmap_ip *map, u32 id,
- size_t dsize)
- {
- return nla_put_ipaddr4(skb, IPSET_ATTR_IP,
- htonl(map->first_ip + id * map->hosts));
- }
- static int
- bitmap_ip_do_head(struct sk_buff *skb, const struct bitmap_ip *map)
- {
- return nla_put_ipaddr4(skb, IPSET_ATTR_IP, htonl(map->first_ip)) ||
- nla_put_ipaddr4(skb, IPSET_ATTR_IP_TO, htonl(map->last_ip)) ||
- (map->netmask != 32 &&
- nla_put_u8(skb, IPSET_ATTR_NETMASK, map->netmask));
- }
- static int
- bitmap_ip_kadt(struct ip_set *set, const struct sk_buff *skb,
- const struct xt_action_param *par,
- enum ipset_adt adt, struct ip_set_adt_opt *opt)
- {
- struct bitmap_ip *map = set->data;
- ipset_adtfn adtfn = set->variant->adt[adt];
- struct bitmap_ip_adt_elem e = { .id = 0 };
- struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
- u32 ip;
- ip = ntohl(ip4addr(skb, opt->flags & IPSET_DIM_ONE_SRC));
- if (ip < map->first_ip || ip > map->last_ip)
- return -IPSET_ERR_BITMAP_RANGE;
- e.id = ip_to_id(map, ip);
- return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
- }
- static int
- bitmap_ip_uadt(struct ip_set *set, struct nlattr *tb[],
- enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
- {
- struct bitmap_ip *map = set->data;
- ipset_adtfn adtfn = set->variant->adt[adt];
- u32 ip = 0, ip_to = 0;
- struct bitmap_ip_adt_elem e = { .id = 0 };
- struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
- int ret = 0;
- if (tb[IPSET_ATTR_LINENO])
- *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
- if (unlikely(!tb[IPSET_ATTR_IP]))
- return -IPSET_ERR_PROTOCOL;
- ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip);
- if (ret)
- return ret;
- ret = ip_set_get_extensions(set, tb, &ext);
- if (ret)
- return ret;
- if (ip < map->first_ip || ip > map->last_ip)
- return -IPSET_ERR_BITMAP_RANGE;
- if (adt == IPSET_TEST) {
- e.id = ip_to_id(map, ip);
- return adtfn(set, &e, &ext, &ext, flags);
- }
- if (tb[IPSET_ATTR_IP_TO]) {
- ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
- if (ret)
- return ret;
- if (ip > ip_to) {
- swap(ip, ip_to);
- if (ip < map->first_ip)
- return -IPSET_ERR_BITMAP_RANGE;
- }
- } else if (tb[IPSET_ATTR_CIDR]) {
- u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
- if (!cidr || cidr > HOST_MASK)
- return -IPSET_ERR_INVALID_CIDR;
- ip_set_mask_from_to(ip, ip_to, cidr);
- } else {
- ip_to = ip;
- }
- if (ip_to > map->last_ip)
- return -IPSET_ERR_BITMAP_RANGE;
- for (; !before(ip_to, ip); ip += map->hosts) {
- e.id = ip_to_id(map, ip);
- ret = adtfn(set, &e, &ext, &ext, flags);
- if (ret && !ip_set_eexist(ret, flags))
- return ret;
- ret = 0;
- }
- return ret;
- }
- static bool
- bitmap_ip_same_set(const struct ip_set *a, const struct ip_set *b)
- {
- const struct bitmap_ip *x = a->data;
- const struct bitmap_ip *y = b->data;
- return x->first_ip == y->first_ip &&
- x->last_ip == y->last_ip &&
- x->netmask == y->netmask &&
- a->timeout == b->timeout &&
- a->extensions == b->extensions;
- }
- /* Plain variant */
- struct bitmap_ip_elem {
- };
- #include "ip_set_bitmap_gen.h"
- /* Create bitmap:ip type of sets */
- static bool
- init_map_ip(struct ip_set *set, struct bitmap_ip *map,
- u32 first_ip, u32 last_ip,
- u32 elements, u32 hosts, u8 netmask)
- {
- map->members = bitmap_zalloc(elements, GFP_KERNEL | __GFP_NOWARN);
- if (!map->members)
- return false;
- map->first_ip = first_ip;
- map->last_ip = last_ip;
- map->elements = elements;
- map->hosts = hosts;
- map->netmask = netmask;
- set->timeout = IPSET_NO_TIMEOUT;
- map->set = set;
- set->data = map;
- set->family = NFPROTO_IPV4;
- return true;
- }
- static u32
- range_to_mask(u32 from, u32 to, u8 *bits)
- {
- u32 mask = 0xFFFFFFFE;
- *bits = 32;
- while (--(*bits) > 0 && mask && (to & mask) != from)
- mask <<= 1;
- return mask;
- }
- static int
- bitmap_ip_create(struct net *net, struct ip_set *set, struct nlattr *tb[],
- u32 flags)
- {
- struct bitmap_ip *map;
- u32 first_ip = 0, last_ip = 0, hosts;
- u64 elements;
- u8 netmask = 32;
- int ret;
- if (unlikely(!tb[IPSET_ATTR_IP] ||
- !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
- !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
- return -IPSET_ERR_PROTOCOL;
- ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &first_ip);
- if (ret)
- return ret;
- if (tb[IPSET_ATTR_IP_TO]) {
- ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &last_ip);
- if (ret)
- return ret;
- if (first_ip > last_ip)
- swap(first_ip, last_ip);
- } else if (tb[IPSET_ATTR_CIDR]) {
- u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
- if (cidr >= HOST_MASK)
- return -IPSET_ERR_INVALID_CIDR;
- ip_set_mask_from_to(first_ip, last_ip, cidr);
- } else {
- return -IPSET_ERR_PROTOCOL;
- }
- if (tb[IPSET_ATTR_NETMASK]) {
- netmask = nla_get_u8(tb[IPSET_ATTR_NETMASK]);
- if (netmask > HOST_MASK)
- return -IPSET_ERR_INVALID_NETMASK;
- first_ip &= ip_set_hostmask(netmask);
- last_ip |= ~ip_set_hostmask(netmask);
- }
- if (netmask == 32) {
- hosts = 1;
- elements = (u64)last_ip - first_ip + 1;
- } else {
- u8 mask_bits;
- u32 mask;
- mask = range_to_mask(first_ip, last_ip, &mask_bits);
- if ((!mask && (first_ip || last_ip != 0xFFFFFFFF)) ||
- netmask <= mask_bits)
- return -IPSET_ERR_BITMAP_RANGE;
- pr_debug("mask_bits %u, netmask %u\n", mask_bits, netmask);
- hosts = 2 << (32 - netmask - 1);
- elements = 2 << (netmask - mask_bits - 1);
- }
- if (elements > IPSET_BITMAP_MAX_RANGE + 1)
- return -IPSET_ERR_BITMAP_RANGE_SIZE;
- pr_debug("hosts %u, elements %llu\n",
- hosts, (unsigned long long)elements);
- set->dsize = ip_set_elem_len(set, tb, 0, 0);
- map = ip_set_alloc(sizeof(*map) + elements * set->dsize);
- if (!map)
- return -ENOMEM;
- map->memsize = BITS_TO_LONGS(elements) * sizeof(unsigned long);
- set->variant = &bitmap_ip;
- if (!init_map_ip(set, map, first_ip, last_ip,
- elements, hosts, netmask)) {
- ip_set_free(map);
- return -ENOMEM;
- }
- if (tb[IPSET_ATTR_TIMEOUT]) {
- set->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
- bitmap_ip_gc_init(set, bitmap_ip_gc);
- }
- return 0;
- }
- static struct ip_set_type bitmap_ip_type __read_mostly = {
- .name = "bitmap:ip",
- .protocol = IPSET_PROTOCOL,
- .features = IPSET_TYPE_IP,
- .dimension = IPSET_DIM_ONE,
- .family = NFPROTO_IPV4,
- .revision_min = IPSET_TYPE_REV_MIN,
- .revision_max = IPSET_TYPE_REV_MAX,
- .create = bitmap_ip_create,
- .create_policy = {
- [IPSET_ATTR_IP] = { .type = NLA_NESTED },
- [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED },
- [IPSET_ATTR_CIDR] = { .type = NLA_U8 },
- [IPSET_ATTR_NETMASK] = { .type = NLA_U8 },
- [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
- [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
- },
- .adt_policy = {
- [IPSET_ATTR_IP] = { .type = NLA_NESTED },
- [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED },
- [IPSET_ATTR_CIDR] = { .type = NLA_U8 },
- [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
- [IPSET_ATTR_LINENO] = { .type = NLA_U32 },
- [IPSET_ATTR_BYTES] = { .type = NLA_U64 },
- [IPSET_ATTR_PACKETS] = { .type = NLA_U64 },
- [IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING,
- .len = IPSET_MAX_COMMENT_SIZE },
- [IPSET_ATTR_SKBMARK] = { .type = NLA_U64 },
- [IPSET_ATTR_SKBPRIO] = { .type = NLA_U32 },
- [IPSET_ATTR_SKBQUEUE] = { .type = NLA_U16 },
- },
- .me = THIS_MODULE,
- };
- static int __init
- bitmap_ip_init(void)
- {
- return ip_set_type_register(&bitmap_ip_type);
- }
- static void __exit
- bitmap_ip_fini(void)
- {
- rcu_barrier();
- ip_set_type_unregister(&bitmap_ip_type);
- }
- module_init(bitmap_ip_init);
- module_exit(bitmap_ip_fini);
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