123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321 |
- // SPDX-License-Identifier: GPL-2.0-only
- /* Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@netfilter.org> */
- /* 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_hash.h>
- #define IPSET_TYPE_REV_MIN 0
- /* 1 Counters support */
- /* 2 Comments support */
- /* 3 Forceadd support */
- #define IPSET_TYPE_REV_MAX 4 /* skbinfo support */
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@netfilter.org>");
- IP_SET_MODULE_DESC("hash:ip", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
- MODULE_ALIAS("ip_set_hash:ip");
- /* Type specific function prefix */
- #define HTYPE hash_ip
- #define IP_SET_HASH_WITH_NETMASK
- /* IPv4 variant */
- /* Member elements */
- struct hash_ip4_elem {
- /* Zero valued IP addresses cannot be stored */
- __be32 ip;
- };
- /* Common functions */
- static bool
- hash_ip4_data_equal(const struct hash_ip4_elem *e1,
- const struct hash_ip4_elem *e2,
- u32 *multi)
- {
- return e1->ip == e2->ip;
- }
- static bool
- hash_ip4_data_list(struct sk_buff *skb, const struct hash_ip4_elem *e)
- {
- if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, e->ip))
- goto nla_put_failure;
- return false;
- nla_put_failure:
- return true;
- }
- static void
- hash_ip4_data_next(struct hash_ip4_elem *next, const struct hash_ip4_elem *e)
- {
- next->ip = e->ip;
- }
- #define MTYPE hash_ip4
- #define HOST_MASK 32
- #include "ip_set_hash_gen.h"
- static int
- hash_ip4_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)
- {
- const struct hash_ip4 *h = set->data;
- ipset_adtfn adtfn = set->variant->adt[adt];
- struct hash_ip4_elem e = { 0 };
- struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
- __be32 ip;
- ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &ip);
- ip &= ip_set_netmask(h->netmask);
- if (ip == 0)
- return -EINVAL;
- e.ip = ip;
- return adtfn(set, &e, &ext, &opt->ext, 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 hash_ip4 *h = set->data;
- ipset_adtfn adtfn = set->variant->adt[adt];
- struct hash_ip4_elem e = { 0 };
- struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
- u32 ip = 0, ip_to = 0, hosts;
- 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;
- ip &= ip_set_hostmask(h->netmask);
- e.ip = htonl(ip);
- if (e.ip == 0)
- return -IPSET_ERR_HASH_ELEM;
- if (adt == IPSET_TEST)
- return adtfn(set, &e, &ext, &ext, 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 > HOST_MASK)
- 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);
- e.ip = htonl(ip);
- }
- for (; ip <= ip_to;) {
- ret = adtfn(set, &e, &ext, &ext, flags);
- if (ret && !ip_set_eexist(ret, flags))
- return ret;
- ip += hosts;
- e.ip = htonl(ip);
- if (e.ip == 0)
- return 0;
- ret = 0;
- }
- return ret;
- }
- /* IPv6 variant */
- /* Member elements */
- struct hash_ip6_elem {
- union nf_inet_addr ip;
- };
- /* Common functions */
- static bool
- hash_ip6_data_equal(const struct hash_ip6_elem *ip1,
- const struct hash_ip6_elem *ip2,
- u32 *multi)
- {
- return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6);
- }
- static void
- hash_ip6_netmask(union nf_inet_addr *ip, u8 prefix)
- {
- ip6_netmask(ip, prefix);
- }
- static bool
- hash_ip6_data_list(struct sk_buff *skb, const struct hash_ip6_elem *e)
- {
- if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &e->ip.in6))
- goto nla_put_failure;
- return false;
- nla_put_failure:
- return true;
- }
- static void
- hash_ip6_data_next(struct hash_ip6_elem *next, const struct hash_ip6_elem *e)
- {
- }
- #undef MTYPE
- #undef HOST_MASK
- #define MTYPE hash_ip6
- #define HOST_MASK 128
- #define IP_SET_EMIT_CREATE
- #include "ip_set_hash_gen.h"
- static int
- hash_ip6_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)
- {
- const struct hash_ip6 *h = set->data;
- ipset_adtfn adtfn = set->variant->adt[adt];
- struct hash_ip6_elem e = { { .all = { 0 } } };
- struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
- ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
- hash_ip6_netmask(&e.ip, h->netmask);
- if (ipv6_addr_any(&e.ip.in6))
- return -EINVAL;
- return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
- }
- static int
- hash_ip6_uadt(struct ip_set *set, struct nlattr *tb[],
- enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
- {
- const struct hash_ip6 *h = set->data;
- ipset_adtfn adtfn = set->variant->adt[adt];
- struct hash_ip6_elem e = { { .all = { 0 } } };
- struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
- int ret;
- if (tb[IPSET_ATTR_LINENO])
- *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
- if (unlikely(!tb[IPSET_ATTR_IP]))
- return -IPSET_ERR_PROTOCOL;
- if (unlikely(tb[IPSET_ATTR_IP_TO]))
- return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
- if (unlikely(tb[IPSET_ATTR_CIDR])) {
- u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
- if (cidr != HOST_MASK)
- return -IPSET_ERR_INVALID_CIDR;
- }
- ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip);
- if (ret)
- return ret;
- ret = ip_set_get_extensions(set, tb, &ext);
- if (ret)
- return ret;
- hash_ip6_netmask(&e.ip, h->netmask);
- if (ipv6_addr_any(&e.ip.in6))
- return -IPSET_ERR_HASH_ELEM;
- ret = adtfn(set, &e, &ext, &ext, flags);
- return ip_set_eexist(ret, flags) ? 0 : ret;
- }
- 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 = IPSET_TYPE_REV_MIN,
- .revision_max = IPSET_TYPE_REV_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 },
- [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
- hash_ip_init(void)
- {
- return ip_set_type_register(&hash_ip_type);
- }
- static void __exit
- hash_ip_fini(void)
- {
- rcu_barrier();
- ip_set_type_unregister(&hash_ip_type);
- }
- module_init(hash_ip_init);
- module_exit(hash_ip_fini);
|