| /* Copyright (C) 2003-2013 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_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@blackhole.kfki.hu>"); |
| 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 inline 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 inline 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_ip *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_ip *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); |
| |
| if (adt == IPSET_TEST) { |
| e.ip = htonl(ip); |
| if (e.ip == 0) |
| return -IPSET_ERR_HASH_ELEM; |
| 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); |
| for (; !before(ip_to, ip); ip += hosts) { |
| e.ip = htonl(ip); |
| if (e.ip == 0) |
| return -IPSET_ERR_HASH_ELEM; |
| ret = adtfn(set, &e, &ext, &ext, flags); |
| |
| if (ret && !ip_set_eexist(ret, flags)) |
| return ret; |
| |
| ret = 0; |
| } |
| return ret; |
| } |
| |
| /* IPv6 variant */ |
| |
| /* Member elements */ |
| struct hash_ip6_elem { |
| union nf_inet_addr ip; |
| }; |
| |
| /* Common functions */ |
| |
| static inline 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 inline 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 inline void |
| hash_ip6_data_next(struct hash_ip4_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_ip *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_ip *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); |