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- // 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,port,net 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_getport.h>
- #include <linux/netfilter/ipset/ip_set_hash.h>
- #define IPSET_TYPE_REV_MIN 0
- /* 1 SCTP and UDPLITE support added */
- /* 2 Range as input support for IPv4 added */
- /* 3 nomatch flag support added */
- /* 4 Counters support added */
- /* 5 Comments support added */
- /* 6 Forceadd support added */
- #define IPSET_TYPE_REV_MAX 7 /* skbinfo support added */
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@netfilter.org>");
- IP_SET_MODULE_DESC("hash:ip,port,net", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
- MODULE_ALIAS("ip_set_hash:ip,port,net");
- /* Type specific function prefix */
- #define HTYPE hash_ipportnet
- /* We squeeze the "nomatch" flag into cidr: we don't support cidr == 0
- * However this way we have to store internally cidr - 1,
- * dancing back and forth.
- */
- #define IP_SET_HASH_WITH_NETS_PACKED
- #define IP_SET_HASH_WITH_PROTO
- #define IP_SET_HASH_WITH_NETS
- /* IPv4 variant */
- /* Member elements */
- struct hash_ipportnet4_elem {
- __be32 ip;
- __be32 ip2;
- __be16 port;
- u8 cidr:7;
- u8 nomatch:1;
- u8 proto;
- };
- /* Common functions */
- static bool
- hash_ipportnet4_data_equal(const struct hash_ipportnet4_elem *ip1,
- const struct hash_ipportnet4_elem *ip2,
- u32 *multi)
- {
- return ip1->ip == ip2->ip &&
- ip1->ip2 == ip2->ip2 &&
- ip1->cidr == ip2->cidr &&
- ip1->port == ip2->port &&
- ip1->proto == ip2->proto;
- }
- static int
- hash_ipportnet4_do_data_match(const struct hash_ipportnet4_elem *elem)
- {
- return elem->nomatch ? -ENOTEMPTY : 1;
- }
- static void
- hash_ipportnet4_data_set_flags(struct hash_ipportnet4_elem *elem, u32 flags)
- {
- elem->nomatch = !!((flags >> 16) & IPSET_FLAG_NOMATCH);
- }
- static void
- hash_ipportnet4_data_reset_flags(struct hash_ipportnet4_elem *elem, u8 *flags)
- {
- swap(*flags, elem->nomatch);
- }
- static void
- hash_ipportnet4_data_netmask(struct hash_ipportnet4_elem *elem, u8 cidr)
- {
- elem->ip2 &= ip_set_netmask(cidr);
- elem->cidr = cidr - 1;
- }
- static bool
- hash_ipportnet4_data_list(struct sk_buff *skb,
- const struct hash_ipportnet4_elem *data)
- {
- u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
- if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
- nla_put_ipaddr4(skb, IPSET_ATTR_IP2, data->ip2) ||
- nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
- nla_put_u8(skb, IPSET_ATTR_CIDR2, data->cidr + 1) ||
- nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto) ||
- (flags &&
- nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
- goto nla_put_failure;
- return false;
- nla_put_failure:
- return true;
- }
- static void
- hash_ipportnet4_data_next(struct hash_ipportnet4_elem *next,
- const struct hash_ipportnet4_elem *d)
- {
- next->ip = d->ip;
- next->port = d->port;
- next->ip2 = d->ip2;
- }
- #define MTYPE hash_ipportnet4
- #define HOST_MASK 32
- #include "ip_set_hash_gen.h"
- static int
- hash_ipportnet4_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_ipportnet4 *h = set->data;
- ipset_adtfn adtfn = set->variant->adt[adt];
- struct hash_ipportnet4_elem e = {
- .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
- };
- struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
- if (adt == IPSET_TEST)
- e.cidr = HOST_MASK - 1;
- if (!ip_set_get_ip4_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
- &e.port, &e.proto))
- return -EINVAL;
- ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
- ip4addrptr(skb, opt->flags & IPSET_DIM_THREE_SRC, &e.ip2);
- e.ip2 &= ip_set_netmask(e.cidr + 1);
- return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
- }
- static int
- hash_ipportnet4_uadt(struct ip_set *set, struct nlattr *tb[],
- enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
- {
- const struct hash_ipportnet4 *h = set->data;
- ipset_adtfn adtfn = set->variant->adt[adt];
- struct hash_ipportnet4_elem e = { .cidr = HOST_MASK - 1 };
- struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
- u32 ip = 0, ip_to = 0, p = 0, port, port_to;
- u32 ip2_from = 0, ip2_to = 0, ip2;
- bool with_ports = false;
- u8 cidr;
- int ret;
- if (tb[IPSET_ATTR_LINENO])
- *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
- if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] ||
- !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
- !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
- !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
- 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;
- ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP2], &ip2_from);
- if (ret)
- return ret;
- if (tb[IPSET_ATTR_CIDR2]) {
- cidr = nla_get_u8(tb[IPSET_ATTR_CIDR2]);
- if (!cidr || cidr > HOST_MASK)
- return -IPSET_ERR_INVALID_CIDR;
- e.cidr = cidr - 1;
- }
- e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
- if (tb[IPSET_ATTR_PROTO]) {
- e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
- with_ports = ip_set_proto_with_ports(e.proto);
- if (e.proto == 0)
- return -IPSET_ERR_INVALID_PROTO;
- } else {
- return -IPSET_ERR_MISSING_PROTO;
- }
- if (!(with_ports || e.proto == IPPROTO_ICMP))
- e.port = 0;
- if (tb[IPSET_ATTR_CADT_FLAGS]) {
- u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
- if (cadt_flags & IPSET_FLAG_NOMATCH)
- flags |= (IPSET_FLAG_NOMATCH << 16);
- }
- with_ports = with_ports && tb[IPSET_ATTR_PORT_TO];
- if (adt == IPSET_TEST ||
- !(tb[IPSET_ATTR_CIDR] || tb[IPSET_ATTR_IP_TO] || with_ports ||
- tb[IPSET_ATTR_IP2_TO])) {
- e.ip = htonl(ip);
- e.ip2 = htonl(ip2_from & ip_set_hostmask(e.cidr + 1));
- ret = adtfn(set, &e, &ext, &ext, flags);
- return ip_set_enomatch(ret, flags, adt, set) ? -ret :
- ip_set_eexist(ret, flags) ? 0 : ret;
- }
- 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]) {
- 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);
- }
- port_to = port = ntohs(e.port);
- if (tb[IPSET_ATTR_PORT_TO]) {
- port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
- if (port > port_to)
- swap(port, port_to);
- }
- ip2_to = ip2_from;
- if (tb[IPSET_ATTR_IP2_TO]) {
- ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP2_TO], &ip2_to);
- if (ret)
- return ret;
- if (ip2_from > ip2_to)
- swap(ip2_from, ip2_to);
- if (ip2_from + UINT_MAX == ip2_to)
- return -IPSET_ERR_HASH_RANGE;
- } else {
- ip_set_mask_from_to(ip2_from, ip2_to, e.cidr + 1);
- }
- if (retried) {
- ip = ntohl(h->next.ip);
- p = ntohs(h->next.port);
- ip2 = ntohl(h->next.ip2);
- } else {
- p = port;
- ip2 = ip2_from;
- }
- for (; ip <= ip_to; ip++) {
- e.ip = htonl(ip);
- for (; p <= port_to; p++) {
- e.port = htons(p);
- do {
- e.ip2 = htonl(ip2);
- ip2 = ip_set_range_to_cidr(ip2, ip2_to, &cidr);
- e.cidr = cidr - 1;
- ret = adtfn(set, &e, &ext, &ext, flags);
- if (ret && !ip_set_eexist(ret, flags))
- return ret;
- ret = 0;
- } while (ip2++ < ip2_to);
- ip2 = ip2_from;
- }
- p = port;
- }
- return ret;
- }
- /* IPv6 variant */
- struct hash_ipportnet6_elem {
- union nf_inet_addr ip;
- union nf_inet_addr ip2;
- __be16 port;
- u8 cidr:7;
- u8 nomatch:1;
- u8 proto;
- };
- /* Common functions */
- static bool
- hash_ipportnet6_data_equal(const struct hash_ipportnet6_elem *ip1,
- const struct hash_ipportnet6_elem *ip2,
- u32 *multi)
- {
- return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
- ipv6_addr_equal(&ip1->ip2.in6, &ip2->ip2.in6) &&
- ip1->cidr == ip2->cidr &&
- ip1->port == ip2->port &&
- ip1->proto == ip2->proto;
- }
- static int
- hash_ipportnet6_do_data_match(const struct hash_ipportnet6_elem *elem)
- {
- return elem->nomatch ? -ENOTEMPTY : 1;
- }
- static void
- hash_ipportnet6_data_set_flags(struct hash_ipportnet6_elem *elem, u32 flags)
- {
- elem->nomatch = !!((flags >> 16) & IPSET_FLAG_NOMATCH);
- }
- static void
- hash_ipportnet6_data_reset_flags(struct hash_ipportnet6_elem *elem, u8 *flags)
- {
- swap(*flags, elem->nomatch);
- }
- static void
- hash_ipportnet6_data_netmask(struct hash_ipportnet6_elem *elem, u8 cidr)
- {
- ip6_netmask(&elem->ip2, cidr);
- elem->cidr = cidr - 1;
- }
- static bool
- hash_ipportnet6_data_list(struct sk_buff *skb,
- const struct hash_ipportnet6_elem *data)
- {
- u32 flags = data->nomatch ? IPSET_FLAG_NOMATCH : 0;
- if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
- nla_put_ipaddr6(skb, IPSET_ATTR_IP2, &data->ip2.in6) ||
- nla_put_net16(skb, IPSET_ATTR_PORT, data->port) ||
- nla_put_u8(skb, IPSET_ATTR_CIDR2, data->cidr + 1) ||
- nla_put_u8(skb, IPSET_ATTR_PROTO, data->proto) ||
- (flags &&
- nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
- goto nla_put_failure;
- return false;
- nla_put_failure:
- return true;
- }
- static void
- hash_ipportnet6_data_next(struct hash_ipportnet6_elem *next,
- const struct hash_ipportnet6_elem *d)
- {
- next->port = d->port;
- }
- #undef MTYPE
- #undef HOST_MASK
- #define MTYPE hash_ipportnet6
- #define HOST_MASK 128
- #define IP_SET_EMIT_CREATE
- #include "ip_set_hash_gen.h"
- static int
- hash_ipportnet6_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_ipportnet6 *h = set->data;
- ipset_adtfn adtfn = set->variant->adt[adt];
- struct hash_ipportnet6_elem e = {
- .cidr = INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
- };
- struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
- if (adt == IPSET_TEST)
- e.cidr = HOST_MASK - 1;
- if (!ip_set_get_ip6_port(skb, opt->flags & IPSET_DIM_TWO_SRC,
- &e.port, &e.proto))
- return -EINVAL;
- ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
- ip6addrptr(skb, opt->flags & IPSET_DIM_THREE_SRC, &e.ip2.in6);
- ip6_netmask(&e.ip2, e.cidr + 1);
- return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
- }
- static int
- hash_ipportnet6_uadt(struct ip_set *set, struct nlattr *tb[],
- enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
- {
- const struct hash_ipportnet6 *h = set->data;
- ipset_adtfn adtfn = set->variant->adt[adt];
- struct hash_ipportnet6_elem e = { .cidr = HOST_MASK - 1 };
- struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
- u32 port, port_to;
- bool with_ports = false;
- u8 cidr;
- int ret;
- if (tb[IPSET_ATTR_LINENO])
- *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
- if (unlikely(!tb[IPSET_ATTR_IP] || !tb[IPSET_ATTR_IP2] ||
- !ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
- !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
- !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
- return -IPSET_ERR_PROTOCOL;
- if (unlikely(tb[IPSET_ATTR_IP_TO]))
- return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
- if (unlikely(tb[IPSET_ATTR_CIDR])) {
- 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;
- ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP2], &e.ip2);
- if (ret)
- return ret;
- if (tb[IPSET_ATTR_CIDR2]) {
- cidr = nla_get_u8(tb[IPSET_ATTR_CIDR2]);
- if (!cidr || cidr > HOST_MASK)
- return -IPSET_ERR_INVALID_CIDR;
- e.cidr = cidr - 1;
- }
- ip6_netmask(&e.ip2, e.cidr + 1);
- e.port = nla_get_be16(tb[IPSET_ATTR_PORT]);
- if (tb[IPSET_ATTR_PROTO]) {
- e.proto = nla_get_u8(tb[IPSET_ATTR_PROTO]);
- with_ports = ip_set_proto_with_ports(e.proto);
- if (e.proto == 0)
- return -IPSET_ERR_INVALID_PROTO;
- } else {
- return -IPSET_ERR_MISSING_PROTO;
- }
- if (!(with_ports || e.proto == IPPROTO_ICMPV6))
- e.port = 0;
- if (tb[IPSET_ATTR_CADT_FLAGS]) {
- u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
- if (cadt_flags & IPSET_FLAG_NOMATCH)
- flags |= (IPSET_FLAG_NOMATCH << 16);
- }
- if (adt == IPSET_TEST || !with_ports || !tb[IPSET_ATTR_PORT_TO]) {
- ret = adtfn(set, &e, &ext, &ext, flags);
- return ip_set_enomatch(ret, flags, adt, set) ? -ret :
- ip_set_eexist(ret, flags) ? 0 : ret;
- }
- port = ntohs(e.port);
- port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
- if (port > port_to)
- swap(port, port_to);
- if (retried)
- port = ntohs(h->next.port);
- for (; port <= port_to; port++) {
- e.port = htons(port);
- ret = adtfn(set, &e, &ext, &ext, flags);
- if (ret && !ip_set_eexist(ret, flags))
- return ret;
- ret = 0;
- }
- return ret;
- }
- static struct ip_set_type hash_ipportnet_type __read_mostly = {
- .name = "hash:ip,port,net",
- .protocol = IPSET_PROTOCOL,
- .features = IPSET_TYPE_IP | IPSET_TYPE_PORT | IPSET_TYPE_IP2 |
- IPSET_TYPE_NOMATCH,
- .dimension = IPSET_DIM_THREE,
- .family = NFPROTO_UNSPEC,
- .revision_min = IPSET_TYPE_REV_MIN,
- .revision_max = IPSET_TYPE_REV_MAX,
- .create = hash_ipportnet_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_CADT_FLAGS] = { .type = NLA_U32 },
- },
- .adt_policy = {
- [IPSET_ATTR_IP] = { .type = NLA_NESTED },
- [IPSET_ATTR_IP_TO] = { .type = NLA_NESTED },
- [IPSET_ATTR_IP2] = { .type = NLA_NESTED },
- [IPSET_ATTR_IP2_TO] = { .type = NLA_NESTED },
- [IPSET_ATTR_PORT] = { .type = NLA_U16 },
- [IPSET_ATTR_PORT_TO] = { .type = NLA_U16 },
- [IPSET_ATTR_CIDR] = { .type = NLA_U8 },
- [IPSET_ATTR_CIDR2] = { .type = NLA_U8 },
- [IPSET_ATTR_PROTO] = { .type = NLA_U8 },
- [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
- [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_ipportnet_init(void)
- {
- return ip_set_type_register(&hash_ipportnet_type);
- }
- static void __exit
- hash_ipportnet_fini(void)
- {
- rcu_barrier();
- ip_set_type_unregister(&hash_ipportnet_type);
- }
- module_init(hash_ipportnet_init);
- module_exit(hash_ipportnet_fini);
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