/net/netfilter/ipset/ip_set_hash_ip.c
C | 492 lines | 388 code | 89 blank | 15 comment | 69 complexity | 8525ff42bb08ab8b281a059ebc1aacc7 MD5 | raw file
- /* Copyright (C) 2003-2011 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 hash:ip type */
- #include <linux/jhash.h>
- #include <linux/module.h>
- #include <linux/ip.h>
- #include <linux/skbuff.h>
- #include <linux/errno.h>
- #include <linux/random.h>
- #include <net/ip.h>
- #include <net/ipv6.h>
- #include <net/netlink.h>
- #include <net/tcp.h>
- #include <linux/netfilter.h>
- #include <linux/netfilter/ipset/pfxlen.h>
- #include <linux/netfilter/ipset/ip_set.h>
- #include <linux/netfilter/ipset/ip_set_timeout.h>
- #include <linux/netfilter/ipset/ip_set_hash.h>
- #define REVISION_MIN 0
- #define REVISION_MAX 0
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
- IP_SET_MODULE_DESC("hash:ip", REVISION_MIN, REVISION_MAX);
- MODULE_ALIAS("ip_set_hash:ip");
- /* Type specific function prefix */
- #define TYPE hash_ip
- static bool
- hash_ip_same_set(const struct ip_set *a, const struct ip_set *b);
- #define hash_ip4_same_set hash_ip_same_set
- #define hash_ip6_same_set hash_ip_same_set
- /* The type variant functions: IPv4 */
- /* Member elements without timeout */
- struct hash_ip4_elem {
- __be32 ip;
- };
- /* Member elements with timeout support */
- struct hash_ip4_telem {
- __be32 ip;
- unsigned long timeout;
- };
- static inline bool
- hash_ip4_data_equal(const struct hash_ip4_elem *ip1,
- const struct hash_ip4_elem *ip2,
- u32 *multi)
- {
- return ip1->ip == ip2->ip;
- }
- static inline bool
- hash_ip4_data_isnull(const struct hash_ip4_elem *elem)
- {
- return elem->ip == 0;
- }
- static inline void
- hash_ip4_data_copy(struct hash_ip4_elem *dst, const struct hash_ip4_elem *src)
- {
- dst->ip = src->ip;
- }
- /* Zero valued IP addresses cannot be stored */
- static inline void
- hash_ip4_data_zero_out(struct hash_ip4_elem *elem)
- {
- elem->ip = 0;
- }
- static inline bool
- hash_ip4_data_list(struct sk_buff *skb, const struct hash_ip4_elem *data)
- {
- if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip))
- goto nla_put_failure;
- return 0;
- nla_put_failure:
- return 1;
- }
- static bool
- hash_ip4_data_tlist(struct sk_buff *skb, const struct hash_ip4_elem *data)
- {
- const struct hash_ip4_telem *tdata =
- (const struct hash_ip4_telem *)data;
- if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, tdata->ip) ||
- nla_put_net32(skb, IPSET_ATTR_TIMEOUT,
- htonl(ip_set_timeout_get(tdata->timeout))))
- goto nla_put_failure;
- return 0;
- nla_put_failure:
- return 1;
- }
- #define IP_SET_HASH_WITH_NETMASK
- #define PF 4
- #define HOST_MASK 32
- #include <linux/netfilter/ipset/ip_set_ahash.h>
- static inline void
- hash_ip4_data_next(struct ip_set_hash *h, const struct hash_ip4_elem *d)
- {
- h->next.ip = d->ip;
- }
- static int
- hash_ip4_kadt(struct ip_set *set, const struct sk_buff *skb,
- const struct xt_action_param *par,
- enum ipset_adt adt, const struct ip_set_adt_opt *opt)
- {
- const struct ip_set_hash *h = set->data;
- ipset_adtfn adtfn = set->variant->adt[adt];
- __be32 ip;
- ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &ip);
- ip &= ip_set_netmask(h->netmask);
- if (ip == 0)
- return -EINVAL;
- return adtfn(set, &ip, opt_timeout(opt, h), opt->cmdflags);
- }
- static int
- hash_ip4_uadt(struct ip_set *set, struct nlattr *tb[],
- enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
- {
- const struct ip_set_hash *h = set->data;
- ipset_adtfn adtfn = set->variant->adt[adt];
- u32 ip, ip_to, hosts, timeout = h->timeout;
- __be32 nip;
- int ret = 0;
- if (unlikely(!tb[IPSET_ATTR_IP] ||
- !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT)))
- return -IPSET_ERR_PROTOCOL;
- if (tb[IPSET_ATTR_LINENO])
- *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
- ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip);
- if (ret)
- return ret;
- ip &= ip_set_hostmask(h->netmask);
- if (tb[IPSET_ATTR_TIMEOUT]) {
- if (!with_timeout(h->timeout))
- return -IPSET_ERR_TIMEOUT;
- timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
- }
- if (adt == IPSET_TEST) {
- nip = htonl(ip);
- if (nip == 0)
- return -IPSET_ERR_HASH_ELEM;
- return adtfn(set, &nip, timeout, flags);
- }
- ip_to = ip;
- 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);
- } else if (tb[IPSET_ATTR_CIDR]) {
- u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
- if (!cidr || cidr > 32)
- return -IPSET_ERR_INVALID_CIDR;
- ip_set_mask_from_to(ip, ip_to, cidr);
- }
- hosts = h->netmask == 32 ? 1 : 2 << (32 - h->netmask - 1);
- if (retried)
- ip = ntohl(h->next.ip);
- for (; !before(ip_to, ip); ip += hosts) {
- nip = htonl(ip);
- if (nip == 0)
- return -IPSET_ERR_HASH_ELEM;
- ret = adtfn(set, &nip, timeout, flags);
- if (ret && !ip_set_eexist(ret, flags))
- return ret;
- else
- ret = 0;
- }
- return ret;
- }
- static bool
- hash_ip_same_set(const struct ip_set *a, const struct ip_set *b)
- {
- const struct ip_set_hash *x = a->data;
- const struct ip_set_hash *y = b->data;
- /* Resizing changes htable_bits, so we ignore it */
- return x->maxelem == y->maxelem &&
- x->timeout == y->timeout &&
- x->netmask == y->netmask;
- }
- /* The type variant functions: IPv6 */
- struct hash_ip6_elem {
- union nf_inet_addr ip;
- };
- struct hash_ip6_telem {
- union nf_inet_addr ip;
- unsigned long timeout;
- };
- static inline bool
- hash_ip6_data_equal(const struct hash_ip6_elem *ip1,
- const struct hash_ip6_elem *ip2,
- u32 *multi)
- {
- return ipv6_addr_cmp(&ip1->ip.in6, &ip2->ip.in6) == 0;
- }
- static inline bool
- hash_ip6_data_isnull(const struct hash_ip6_elem *elem)
- {
- return ipv6_addr_any(&elem->ip.in6);
- }
- static inline void
- hash_ip6_data_copy(struct hash_ip6_elem *dst, const struct hash_ip6_elem *src)
- {
- dst->ip.in6 = src->ip.in6;
- }
- static inline void
- hash_ip6_data_zero_out(struct hash_ip6_elem *elem)
- {
- ipv6_addr_set(&elem->ip.in6, 0, 0, 0, 0);
- }
- static inline void
- ip6_netmask(union nf_inet_addr *ip, u8 prefix)
- {
- ip->ip6[0] &= ip_set_netmask6(prefix)[0];
- ip->ip6[1] &= ip_set_netmask6(prefix)[1];
- ip->ip6[2] &= ip_set_netmask6(prefix)[2];
- ip->ip6[3] &= ip_set_netmask6(prefix)[3];
- }
- static bool
- hash_ip6_data_list(struct sk_buff *skb, const struct hash_ip6_elem *data)
- {
- if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6))
- goto nla_put_failure;
- return 0;
- nla_put_failure:
- return 1;
- }
- static bool
- hash_ip6_data_tlist(struct sk_buff *skb, const struct hash_ip6_elem *data)
- {
- const struct hash_ip6_telem *e =
- (const struct hash_ip6_telem *)data;
- if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &e->ip.in6) ||
- nla_put_net32(skb, IPSET_ATTR_TIMEOUT,
- htonl(ip_set_timeout_get(e->timeout))))
- goto nla_put_failure;
- return 0;
- nla_put_failure:
- return 1;
- }
- #undef PF
- #undef HOST_MASK
- #define PF 6
- #define HOST_MASK 128
- #include <linux/netfilter/ipset/ip_set_ahash.h>
- static inline void
- hash_ip6_data_next(struct ip_set_hash *h, const struct hash_ip6_elem *d)
- {
- }
- static int
- hash_ip6_kadt(struct ip_set *set, const struct sk_buff *skb,
- const struct xt_action_param *par,
- enum ipset_adt adt, const struct ip_set_adt_opt *opt)
- {
- const struct ip_set_hash *h = set->data;
- ipset_adtfn adtfn = set->variant->adt[adt];
- union nf_inet_addr ip;
- ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &ip.in6);
- ip6_netmask(&ip, h->netmask);
- if (ipv6_addr_any(&ip.in6))
- return -EINVAL;
- return adtfn(set, &ip, opt_timeout(opt, h), opt->cmdflags);
- }
- static const struct nla_policy hash_ip6_adt_policy[IPSET_ATTR_ADT_MAX + 1] = {
- [IPSET_ATTR_IP] = { .type = NLA_NESTED },
- [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
- [IPSET_ATTR_LINENO] = { .type = NLA_U32 },
- };
- static int
- hash_ip6_uadt(struct ip_set *set, struct nlattr *tb[],
- enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
- {
- const struct ip_set_hash *h = set->data;
- ipset_adtfn adtfn = set->variant->adt[adt];
- union nf_inet_addr ip;
- u32 timeout = h->timeout;
- int ret;
- if (unlikely(!tb[IPSET_ATTR_IP] ||
- !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
- tb[IPSET_ATTR_IP_TO] ||
- tb[IPSET_ATTR_CIDR]))
- return -IPSET_ERR_PROTOCOL;
- if (tb[IPSET_ATTR_LINENO])
- *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
- ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &ip);
- if (ret)
- return ret;
- ip6_netmask(&ip, h->netmask);
- if (ipv6_addr_any(&ip.in6))
- return -IPSET_ERR_HASH_ELEM;
- if (tb[IPSET_ATTR_TIMEOUT]) {
- if (!with_timeout(h->timeout))
- return -IPSET_ERR_TIMEOUT;
- timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
- }
- ret = adtfn(set, &ip, timeout, flags);
- return ip_set_eexist(ret, flags) ? 0 : ret;
- }
- /* Create hash:ip type of sets */
- static int
- hash_ip_create(struct ip_set *set, struct nlattr *tb[], u32 flags)
- {
- u32 hashsize = IPSET_DEFAULT_HASHSIZE, maxelem = IPSET_DEFAULT_MAXELEM;
- u8 netmask, hbits;
- size_t hsize;
- struct ip_set_hash *h;
- if (!(set->family == NFPROTO_IPV4 || set->family == NFPROTO_IPV6))
- return -IPSET_ERR_INVALID_FAMILY;
- netmask = set->family == NFPROTO_IPV4 ? 32 : 128;
- pr_debug("Create set %s with family %s\n",
- set->name, set->family == NFPROTO_IPV4 ? "inet" : "inet6");
- if (unlikely(!ip_set_optattr_netorder(tb, IPSET_ATTR_HASHSIZE) ||
- !ip_set_optattr_netorder(tb, IPSET_ATTR_MAXELEM) ||
- !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT)))
- return -IPSET_ERR_PROTOCOL;
- if (tb[IPSET_ATTR_HASHSIZE]) {
- hashsize = ip_set_get_h32(tb[IPSET_ATTR_HASHSIZE]);
- if (hashsize < IPSET_MIMINAL_HASHSIZE)
- hashsize = IPSET_MIMINAL_HASHSIZE;
- }
- if (tb[IPSET_ATTR_MAXELEM])
- maxelem = ip_set_get_h32(tb[IPSET_ATTR_MAXELEM]);
- if (tb[IPSET_ATTR_NETMASK]) {
- netmask = nla_get_u8(tb[IPSET_ATTR_NETMASK]);
- if ((set->family == NFPROTO_IPV4 && netmask > 32) ||
- (set->family == NFPROTO_IPV6 && netmask > 128) ||
- netmask == 0)
- return -IPSET_ERR_INVALID_NETMASK;
- }
- h = kzalloc(sizeof(*h), GFP_KERNEL);
- if (!h)
- return -ENOMEM;
- h->maxelem = maxelem;
- h->netmask = netmask;
- get_random_bytes(&h->initval, sizeof(h->initval));
- h->timeout = IPSET_NO_TIMEOUT;
- hbits = htable_bits(hashsize);
- hsize = htable_size(hbits);
- if (hsize == 0) {
- kfree(h);
- return -ENOMEM;
- }
- h->table = ip_set_alloc(hsize);
- if (!h->table) {
- kfree(h);
- return -ENOMEM;
- }
- h->table->htable_bits = hbits;
- set->data = h;
- if (tb[IPSET_ATTR_TIMEOUT]) {
- h->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
- set->variant = set->family == NFPROTO_IPV4
- ? &hash_ip4_tvariant : &hash_ip6_tvariant;
- if (set->family == NFPROTO_IPV4)
- hash_ip4_gc_init(set);
- else
- hash_ip6_gc_init(set);
- } else {
- set->variant = set->family == NFPROTO_IPV4
- ? &hash_ip4_variant : &hash_ip6_variant;
- }
- pr_debug("create %s hashsize %u (%u) maxelem %u: %p(%p)\n",
- set->name, jhash_size(h->table->htable_bits),
- h->table->htable_bits, h->maxelem, set->data, h->table);
- return 0;
- }
- static struct ip_set_type hash_ip_type __read_mostly = {
- .name = "hash:ip",
- .protocol = IPSET_PROTOCOL,
- .features = IPSET_TYPE_IP,
- .dimension = IPSET_DIM_ONE,
- .family = NFPROTO_UNSPEC,
- .revision_min = REVISION_MIN,
- .revision_max = REVISION_MAX,
- .create = hash_ip_create,
- .create_policy = {
- [IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 },
- [IPSET_ATTR_MAXELEM] = { .type = NLA_U32 },
- [IPSET_ATTR_PROBES] = { .type = NLA_U8 },
- [IPSET_ATTR_RESIZE] = { .type = NLA_U8 },
- [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
- [IPSET_ATTR_NETMASK] = { .type = NLA_U8 },
- },
- .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 },
- },
- .me = THIS_MODULE,
- };
- static int __init
- hash_ip_init(void)
- {
- return ip_set_type_register(&hash_ip_type);
- }
- static void __exit
- hash_ip_fini(void)
- {
- ip_set_type_unregister(&hash_ip_type);
- }
- module_init(hash_ip_init);
- module_exit(hash_ip_fini);