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![Jozsef Kadlecsik](/assets/img/avatar_default.png)
The range size of consecutive elements were not limited. Thus one could define a huge range which may result soft lockup errors due to the long execution time. Now the range size is limited to 2^20 entries. Reported-by: Brad Spengler <spender@grsecurity.net> Signed-off-by: Jozsef Kadlecsik <kadlec@netfilter.org> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
520 lines
13 KiB
C
520 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@netfilter.org> */
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/* Kernel module implementing an IP set type: the hash:net,port type */
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#include <linux/jhash.h>
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#include <linux/module.h>
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#include <linux/ip.h>
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#include <linux/skbuff.h>
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#include <linux/errno.h>
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#include <linux/random.h>
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#include <net/ip.h>
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#include <net/ipv6.h>
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#include <net/netlink.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter/ipset/pfxlen.h>
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#include <linux/netfilter/ipset/ip_set.h>
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#include <linux/netfilter/ipset/ip_set_getport.h>
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#include <linux/netfilter/ipset/ip_set_hash.h>
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#define IPSET_TYPE_REV_MIN 0
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/* 1 SCTP and UDPLITE support added */
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/* 2 Range as input support for IPv4 added */
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/* 3 nomatch flag support added */
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/* 4 Counters support added */
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/* 5 Comments support added */
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/* 6 Forceadd support added */
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/* 7 skbinfo support added */
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#define IPSET_TYPE_REV_MAX 8 /* bucketsize, initval support added */
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@netfilter.org>");
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IP_SET_MODULE_DESC("hash:net,port", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
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MODULE_ALIAS("ip_set_hash:net,port");
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/* Type specific function prefix */
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#define HTYPE hash_netport
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#define IP_SET_HASH_WITH_PROTO
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#define IP_SET_HASH_WITH_NETS
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/* We squeeze the "nomatch" flag into cidr: we don't support cidr == 0
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* However this way we have to store internally cidr - 1,
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* dancing back and forth.
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*/
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#define IP_SET_HASH_WITH_NETS_PACKED
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/* IPv4 variant */
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/* Member elements */
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struct hash_netport4_elem {
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__be32 ip;
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__be16 port;
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u8 proto;
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u8 cidr:7;
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u8 nomatch:1;
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};
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/* Common functions */
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static bool
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hash_netport4_data_equal(const struct hash_netport4_elem *ip1,
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const struct hash_netport4_elem *ip2,
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u32 *multi)
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{
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return ip1->ip == ip2->ip &&
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ip1->port == ip2->port &&
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ip1->proto == ip2->proto &&
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ip1->cidr == ip2->cidr;
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}
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static int
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hash_netport4_do_data_match(const struct hash_netport4_elem *elem)
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{
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return elem->nomatch ? -ENOTEMPTY : 1;
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}
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static void
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hash_netport4_data_set_flags(struct hash_netport4_elem *elem, u32 flags)
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{
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elem->nomatch = !!((flags >> 16) & IPSET_FLAG_NOMATCH);
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}
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static void
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hash_netport4_data_reset_flags(struct hash_netport4_elem *elem, u8 *flags)
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{
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swap(*flags, elem->nomatch);
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}
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static void
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hash_netport4_data_netmask(struct hash_netport4_elem *elem, u8 cidr)
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{
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elem->ip &= ip_set_netmask(cidr);
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elem->cidr = cidr - 1;
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}
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static bool
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hash_netport4_data_list(struct sk_buff *skb,
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const struct hash_netport4_elem *data)
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{
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u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
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if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
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nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
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nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr + 1) ||
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nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto) ||
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(flags &&
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nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
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goto nla_put_failure;
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return false;
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nla_put_failure:
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return true;
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}
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static void
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hash_netport4_data_next(struct hash_netport4_elem *next,
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const struct hash_netport4_elem *d)
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{
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next->ip = d->ip;
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next->port = d->port;
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}
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#define MTYPE hash_netport4
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#define HOST_MASK 32
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#include "ip_set_hash_gen.h"
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static int
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hash_netport4_kadt(struct ip_set *set, const struct sk_buff *skb,
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const struct xt_action_param *par,
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enum ipset_adt adt, struct ip_set_adt_opt *opt)
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{
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const struct hash_netport4 *h = set->data;
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ipset_adtfn adtfn = set->variant->adt[adt];
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struct hash_netport4_elem e = {
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.cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
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};
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struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
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if (adt == IPSET_TEST)
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e.cidr = HOST_MASK - 1;
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if (!ip_set_get_ip4_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
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&e.port, &e.proto))
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return -EINVAL;
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ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
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e.ip &= ip_set_netmask(e.cidr + 1);
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return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
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}
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static int
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hash_netport4_uadt(struct ip_set *set, struct nlattr *tb[],
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enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
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{
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const struct hash_netport4 *h = set->data;
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ipset_adtfn adtfn = set->variant->adt[adt];
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struct hash_netport4_elem e = { .cidr = HOST_MASK - 1 };
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struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
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u32 port, port_to, p = 0, ip = 0, ip_to = 0, ipn;
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u64 n = 0;
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bool with_ports = false;
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u8 cidr;
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int ret;
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if (tb[IPSET_ATTR_LINENO])
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*lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
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if (unlikely(!tb[IPSET_ATTR_IP] ||
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!ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
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!ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
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!ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
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return -IPSET_ERR_PROTOCOL;
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ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip);
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if (ret)
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return ret;
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ret = ip_set_get_extensions(set, tb, &ext);
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if (ret)
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return ret;
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if (tb[IPSET_ATTR_CIDR]) {
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cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
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if (!cidr || cidr > HOST_MASK)
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return -IPSET_ERR_INVALID_CIDR;
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e.cidr = cidr - 1;
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}
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e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
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if (tb[IPSET_ATTR_PROTO]) {
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e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
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with_ports = ip_set_proto_with_ports(e.proto);
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if (e.proto == 0)
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return -IPSET_ERR_INVALID_PROTO;
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} else {
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return -IPSET_ERR_MISSING_PROTO;
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}
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if (!(with_ports || e.proto == IPPROTO_ICMP))
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e.port = 0;
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with_ports = with_ports && tb[IPSET_ATTR_PORT_TO];
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if (tb[IPSET_ATTR_CADT_FLAGS]) {
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u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
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if (cadt_flags & IPSET_FLAG_NOMATCH)
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flags |= (IPSET_FLAG_NOMATCH << 16);
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}
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if (adt == IPSET_TEST || !(with_ports || tb[IPSET_ATTR_IP_TO])) {
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e.ip = htonl(ip & ip_set_hostmask(e.cidr + 1));
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ret = adtfn(set, &e, &ext, &ext, flags);
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return ip_set_enomatch(ret, flags, adt, set) ? -ret :
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ip_set_eexist(ret, flags) ? 0 : ret;
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}
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port = port_to = ntohs(e.port);
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if (tb[IPSET_ATTR_PORT_TO]) {
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port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
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if (port_to < port)
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swap(port, port_to);
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}
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if (tb[IPSET_ATTR_IP_TO]) {
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ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
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if (ret)
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return ret;
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if (ip_to < ip)
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swap(ip, ip_to);
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if (ip + UINT_MAX == ip_to)
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return -IPSET_ERR_HASH_RANGE;
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} else {
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ip_set_mask_from_to(ip, ip_to, e.cidr + 1);
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}
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ipn = ip;
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do {
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ipn = ip_set_range_to_cidr(ipn, ip_to, &cidr);
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n++;
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} while (ipn++ < ip_to);
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if (n*(port_to - port + 1) > IPSET_MAX_RANGE)
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return -ERANGE;
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if (retried) {
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ip = ntohl(h->next.ip);
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p = ntohs(h->next.port);
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} else {
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p = port;
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}
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do {
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e.ip = htonl(ip);
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ip = ip_set_range_to_cidr(ip, ip_to, &cidr);
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e.cidr = cidr - 1;
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for (; p <= port_to; p++) {
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e.port = htons(p);
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ret = adtfn(set, &e, &ext, &ext, flags);
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if (ret && !ip_set_eexist(ret, flags))
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return ret;
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ret = 0;
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}
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p = port;
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} while (ip++ < ip_to);
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return ret;
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}
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/* IPv6 variant */
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struct hash_netport6_elem {
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union nf_inet_addr ip;
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__be16 port;
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u8 proto;
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u8 cidr:7;
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u8 nomatch:1;
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};
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/* Common functions */
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static bool
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hash_netport6_data_equal(const struct hash_netport6_elem *ip1,
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const struct hash_netport6_elem *ip2,
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u32 *multi)
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{
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return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
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ip1->port == ip2->port &&
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ip1->proto == ip2->proto &&
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ip1->cidr == ip2->cidr;
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}
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static int
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hash_netport6_do_data_match(const struct hash_netport6_elem *elem)
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{
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return elem->nomatch ? -ENOTEMPTY : 1;
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}
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static void
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hash_netport6_data_set_flags(struct hash_netport6_elem *elem, u32 flags)
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{
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elem->nomatch = !!((flags >> 16) & IPSET_FLAG_NOMATCH);
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}
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static void
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hash_netport6_data_reset_flags(struct hash_netport6_elem *elem, u8 *flags)
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{
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swap(*flags, elem->nomatch);
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}
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static void
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hash_netport6_data_netmask(struct hash_netport6_elem *elem, u8 cidr)
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{
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ip6_netmask(&elem->ip, cidr);
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elem->cidr = cidr - 1;
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}
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static bool
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hash_netport6_data_list(struct sk_buff *skb,
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const struct hash_netport6_elem *data)
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{
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u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
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if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
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nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
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nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr + 1) ||
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nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto) ||
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(flags &&
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nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
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goto nla_put_failure;
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return false;
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nla_put_failure:
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return true;
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}
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static void
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hash_netport6_data_next(struct hash_netport6_elem *next,
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const struct hash_netport6_elem *d)
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{
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next->port = d->port;
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}
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#undef MTYPE
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#undef HOST_MASK
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#define MTYPE hash_netport6
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#define HOST_MASK 128
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#define IP_SET_EMIT_CREATE
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#include "ip_set_hash_gen.h"
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static int
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hash_netport6_kadt(struct ip_set *set, const struct sk_buff *skb,
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const struct xt_action_param *par,
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enum ipset_adt adt, struct ip_set_adt_opt *opt)
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{
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const struct hash_netport6 *h = set->data;
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ipset_adtfn adtfn = set->variant->adt[adt];
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struct hash_netport6_elem e = {
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.cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
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};
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struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
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if (adt == IPSET_TEST)
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e.cidr = HOST_MASK - 1;
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if (!ip_set_get_ip6_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
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&e.port, &e.proto))
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return -EINVAL;
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ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
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ip6_netmask(&e.ip, e.cidr + 1);
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return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
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}
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static int
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hash_netport6_uadt(struct ip_set *set, struct nlattr *tb[],
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enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
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{
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const struct hash_netport6 *h = set->data;
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ipset_adtfn adtfn = set->variant->adt[adt];
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struct hash_netport6_elem e = { .cidr = HOST_MASK - 1 };
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struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
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u32 port, port_to;
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bool with_ports = false;
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u8 cidr;
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int ret;
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if (tb[IPSET_ATTR_LINENO])
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*lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
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if (unlikely(!tb[IPSET_ATTR_IP] ||
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!ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
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!ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
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!ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
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return -IPSET_ERR_PROTOCOL;
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if (unlikely(tb[IPSET_ATTR_IP_TO]))
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return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
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ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip);
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if (ret)
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return ret;
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ret = ip_set_get_extensions(set, tb, &ext);
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if (ret)
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return ret;
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if (tb[IPSET_ATTR_CIDR]) {
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cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
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if (!cidr || cidr > HOST_MASK)
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return -IPSET_ERR_INVALID_CIDR;
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e.cidr = cidr - 1;
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}
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ip6_netmask(&e.ip, e.cidr + 1);
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e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
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if (tb[IPSET_ATTR_PROTO]) {
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e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
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with_ports = ip_set_proto_with_ports(e.proto);
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if (e.proto == 0)
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return -IPSET_ERR_INVALID_PROTO;
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} else {
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return -IPSET_ERR_MISSING_PROTO;
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}
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if (!(with_ports || e.proto == IPPROTO_ICMPV6))
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e.port = 0;
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if (tb[IPSET_ATTR_CADT_FLAGS]) {
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u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
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if (cadt_flags & IPSET_FLAG_NOMATCH)
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flags |= (IPSET_FLAG_NOMATCH << 16);
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}
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if (adt == IPSET_TEST || !with_ports || !tb[IPSET_ATTR_PORT_TO]) {
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ret = adtfn(set, &e, &ext, &ext, flags);
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return ip_set_enomatch(ret, flags, adt, set) ? -ret :
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ip_set_eexist(ret, flags) ? 0 : ret;
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}
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port = ntohs(e.port);
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port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
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if (port > port_to)
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swap(port, port_to);
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if (retried)
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port = ntohs(h->next.port);
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for (; port <= port_to; port++) {
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e.port = htons(port);
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ret = adtfn(set, &e, &ext, &ext, flags);
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if (ret && !ip_set_eexist(ret, flags))
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return ret;
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ret = 0;
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|
}
|
|
return ret;
|
|
}
|
|
|
|
static struct ip_set_type hash_netport_type __read_mostly = {
|
|
.name = "hash:net,port",
|
|
.protocol = IPSET_PROTOCOL,
|
|
.features = IPSET_TYPE_IP | IPSET_TYPE_PORT | IPSET_TYPE_NOMATCH,
|
|
.dimension = IPSET_DIM_TWO,
|
|
.family = NFPROTO_UNSPEC,
|
|
.revision_min = IPSET_TYPE_REV_MIN,
|
|
.revision_max = IPSET_TYPE_REV_MAX,
|
|
.create_flags[IPSET_TYPE_REV_MAX] = IPSET_CREATE_FLAG_BUCKETSIZE,
|
|
.create = hash_netport_create,
|
|
.create_policy = {
|
|
[IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 },
|
|
[IPSET_ATTR_MAXELEM] = { .type = NLA_U32 },
|
|
[IPSET_ATTR_INITVAL] = { .type = NLA_U32 },
|
|
[IPSET_ATTR_BUCKETSIZE] = { .type = NLA_U8 },
|
|
[IPSET_ATTR_RESIZE] = { .type = NLA_U8 },
|
|
[IPSET_ATTR_PROTO] = { .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_PORT] = { .type = NLA_U16 },
|
|
[IPSET_ATTR_PORT_TO] = { .type = NLA_U16 },
|
|
[IPSET_ATTR_PROTO] = { .type = NLA_U8 },
|
|
[IPSET_ATTR_CIDR] = { .type = NLA_U8 },
|
|
[IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
|
|
[IPSET_ATTR_LINENO] = { .type = NLA_U32 },
|
|
[IPSET_ATTR_CADT_FLAGS] = { .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_netport_init(void)
|
|
{
|
|
return ip_set_type_register(&hash_netport_type);
|
|
}
|
|
|
|
static void __exit
|
|
hash_netport_fini(void)
|
|
{
|
|
rcu_barrier();
|
|
ip_set_type_unregister(&hash_netport_type);
|
|
}
|
|
|
|
module_init(hash_netport_init);
|
|
module_exit(hash_netport_fini);
|