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- /* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu>
- * Patrick Schaaf <bof@bof.de>
- * Martin Josefsson <gandalf@wlug.westbo.se>
- * 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 bitmap:ip,mac type */
- #include <linux/module.h>
- #include <linux/ip.h>
- #include <linux/etherdevice.h>
- #include <linux/skbuff.h>
- #include <linux/errno.h>
- #include <linux/if_ether.h>
- #include <linux/netlink.h>
- #include <linux/jiffies.h>
- #include <linux/timer.h>
- #include <net/netlink.h>
- #include <linux/netfilter/ipset/pfxlen.h>
- #include <linux/netfilter/ipset/ip_set.h>
- #include <linux/netfilter/ipset/ip_set_bitmap.h>
- #define IPSET_TYPE_REV_MIN 0
- /* 1 Counter support added */
- /* 2 Comment support added */
- #define IPSET_TYPE_REV_MAX 3 /* skbinfo support added */
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
- IP_SET_MODULE_DESC("bitmap:ip,mac", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
- MODULE_ALIAS("ip_set_bitmap:ip,mac");
- #define MTYPE bitmap_ipmac
- #define HOST_MASK 32
- #define IP_SET_BITMAP_STORED_TIMEOUT
- enum {
- MAC_UNSET, /* element is set, without MAC */
- MAC_FILLED, /* element is set with MAC */
- };
- /* Type structure */
- struct bitmap_ipmac {
- void *members; /* the set members */
- u32 first_ip; /* host byte order, included in range */
- u32 last_ip; /* host byte order, included in range */
- u32 elements; /* number of max elements in the set */
- size_t memsize; /* members size */
- struct timer_list gc; /* garbage collector */
- unsigned char extensions[0] /* MAC + data extensions */
- __aligned(__alignof__(u64));
- };
- /* ADT structure for generic function args */
- struct bitmap_ipmac_adt_elem {
- unsigned char ether[ETH_ALEN] __aligned(2);
- u16 id;
- u16 add_mac;
- };
- struct bitmap_ipmac_elem {
- unsigned char ether[ETH_ALEN];
- unsigned char filled;
- } __aligned(__alignof__(u64));
- static inline u32
- ip_to_id(const struct bitmap_ipmac *m, u32 ip)
- {
- return ip - m->first_ip;
- }
- #define get_elem(extensions, id, dsize) \
- (struct bitmap_ipmac_elem *)(extensions + (id) * (dsize))
- #define get_const_elem(extensions, id, dsize) \
- (const struct bitmap_ipmac_elem *)(extensions + (id) * (dsize))
- /* Common functions */
- static inline int
- bitmap_ipmac_do_test(const struct bitmap_ipmac_adt_elem *e,
- const struct bitmap_ipmac *map, size_t dsize)
- {
- const struct bitmap_ipmac_elem *elem;
- if (!test_bit(e->id, map->members))
- return 0;
- elem = get_const_elem(map->extensions, e->id, dsize);
- if (e->add_mac && elem->filled == MAC_FILLED)
- return ether_addr_equal(e->ether, elem->ether);
- /* Trigger kernel to fill out the ethernet address */
- return -EAGAIN;
- }
- static inline int
- bitmap_ipmac_gc_test(u16 id, const struct bitmap_ipmac *map, size_t dsize)
- {
- const struct bitmap_ipmac_elem *elem;
- if (!test_bit(id, map->members))
- return 0;
- elem = get_const_elem(map->extensions, id, dsize);
- /* Timer not started for the incomplete elements */
- return elem->filled == MAC_FILLED;
- }
- static inline int
- bitmap_ipmac_is_filled(const struct bitmap_ipmac_elem *elem)
- {
- return elem->filled == MAC_FILLED;
- }
- static inline int
- bitmap_ipmac_add_timeout(unsigned long *timeout,
- const struct bitmap_ipmac_adt_elem *e,
- const struct ip_set_ext *ext, struct ip_set *set,
- struct bitmap_ipmac *map, int mode)
- {
- u32 t = ext->timeout;
- if (mode == IPSET_ADD_START_STORED_TIMEOUT) {
- if (t == set->timeout)
- /* Timeout was not specified, get stored one */
- t = *timeout;
- ip_set_timeout_set(timeout, t);
- } else {
- /* If MAC is unset yet, we store plain timeout value
- * because the timer is not activated yet
- * and we can reuse it later when MAC is filled out,
- * possibly by the kernel
- */
- if (e->add_mac)
- ip_set_timeout_set(timeout, t);
- else
- *timeout = t;
- }
- return 0;
- }
- static inline int
- bitmap_ipmac_do_add(const struct bitmap_ipmac_adt_elem *e,
- struct bitmap_ipmac *map, u32 flags, size_t dsize)
- {
- struct bitmap_ipmac_elem *elem;
- elem = get_elem(map->extensions, e->id, dsize);
- if (test_bit(e->id, map->members)) {
- if (elem->filled == MAC_FILLED) {
- if (e->add_mac &&
- (flags & IPSET_FLAG_EXIST) &&
- !ether_addr_equal(e->ether, elem->ether)) {
- /* memcpy isn't atomic */
- clear_bit(e->id, map->members);
- smp_mb__after_atomic();
- ether_addr_copy(elem->ether, e->ether);
- }
- return IPSET_ADD_FAILED;
- } else if (!e->add_mac)
- /* Already added without ethernet address */
- return IPSET_ADD_FAILED;
- /* Fill the MAC address and trigger the timer activation */
- clear_bit(e->id, map->members);
- smp_mb__after_atomic();
- ether_addr_copy(elem->ether, e->ether);
- elem->filled = MAC_FILLED;
- return IPSET_ADD_START_STORED_TIMEOUT;
- } else if (e->add_mac) {
- /* We can store MAC too */
- ether_addr_copy(elem->ether, e->ether);
- elem->filled = MAC_FILLED;
- return 0;
- }
- elem->filled = MAC_UNSET;
- /* MAC is not stored yet, don't start timer */
- return IPSET_ADD_STORE_PLAIN_TIMEOUT;
- }
- static inline int
- bitmap_ipmac_do_del(const struct bitmap_ipmac_adt_elem *e,
- struct bitmap_ipmac *map)
- {
- return !test_and_clear_bit(e->id, map->members);
- }
- static inline int
- bitmap_ipmac_do_list(struct sk_buff *skb, const struct bitmap_ipmac *map,
- u32 id, size_t dsize)
- {
- const struct bitmap_ipmac_elem *elem =
- get_const_elem(map->extensions, id, dsize);
- return nla_put_ipaddr4(skb, IPSET_ATTR_IP,
- htonl(map->first_ip + id)) ||
- (elem->filled == MAC_FILLED &&
- nla_put(skb, IPSET_ATTR_ETHER, ETH_ALEN, elem->ether));
- }
- static inline int
- bitmap_ipmac_do_head(struct sk_buff *skb, const struct bitmap_ipmac *map)
- {
- return nla_put_ipaddr4(skb, IPSET_ATTR_IP, htonl(map->first_ip)) ||
- nla_put_ipaddr4(skb, IPSET_ATTR_IP_TO, htonl(map->last_ip));
- }
- static int
- bitmap_ipmac_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)
- {
- struct bitmap_ipmac *map = set->data;
- ipset_adtfn adtfn = set->variant->adt[adt];
- struct bitmap_ipmac_adt_elem e = { .id = 0, .add_mac = 1 };
- struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
- u32 ip;
- /* MAC can be src only */
- if (!(opt->flags & IPSET_DIM_TWO_SRC))
- return 0;
- ip = ntohl(ip4addr(skb, opt->flags & IPSET_DIM_ONE_SRC));
- if (ip < map->first_ip || ip > map->last_ip)
- return -IPSET_ERR_BITMAP_RANGE;
- /* Backward compatibility: we don't check the second flag */
- if (skb_mac_header(skb) < skb->head ||
- (skb_mac_header(skb) + ETH_HLEN) > skb->data)
- return -EINVAL;
- e.id = ip_to_id(map, ip);
- memcpy(e.ether, eth_hdr(skb)->h_source, ETH_ALEN);
- return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
- }
- static int
- bitmap_ipmac_uadt(struct ip_set *set, struct nlattr *tb[],
- enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
- {
- const struct bitmap_ipmac *map = set->data;
- ipset_adtfn adtfn = set->variant->adt[adt];
- struct bitmap_ipmac_adt_elem e = { .id = 0 };
- struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
- u32 ip = 0;
- 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;
- if (ip < map->first_ip || ip > map->last_ip)
- return -IPSET_ERR_BITMAP_RANGE;
- e.id = ip_to_id(map, ip);
- if (tb[IPSET_ATTR_ETHER]) {
- memcpy(e.ether, nla_data(tb[IPSET_ATTR_ETHER]), ETH_ALEN);
- e.add_mac = 1;
- }
- ret = adtfn(set, &e, &ext, &ext, flags);
- return ip_set_eexist(ret, flags) ? 0 : ret;
- }
- static bool
- bitmap_ipmac_same_set(const struct ip_set *a, const struct ip_set *b)
- {
- const struct bitmap_ipmac *x = a->data;
- const struct bitmap_ipmac *y = b->data;
- return x->first_ip == y->first_ip &&
- x->last_ip == y->last_ip &&
- a->timeout == b->timeout &&
- a->extensions == b->extensions;
- }
- /* Plain variant */
- #include "ip_set_bitmap_gen.h"
- /* Create bitmap:ip,mac type of sets */
- static bool
- init_map_ipmac(struct ip_set *set, struct bitmap_ipmac *map,
- u32 first_ip, u32 last_ip, u32 elements)
- {
- map->members = ip_set_alloc(map->memsize);
- if (!map->members)
- return false;
- map->first_ip = first_ip;
- map->last_ip = last_ip;
- map->elements = elements;
- set->timeout = IPSET_NO_TIMEOUT;
- set->data = map;
- set->family = NFPROTO_IPV4;
- return true;
- }
- static int
- bitmap_ipmac_create(struct net *net, struct ip_set *set, struct nlattr *tb[],
- u32 flags)
- {
- u32 first_ip = 0, last_ip = 0;
- u64 elements;
- struct bitmap_ipmac *map;
- int ret;
- if (unlikely(!tb[IPSET_ATTR_IP] ||
- !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
- !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
- return -IPSET_ERR_PROTOCOL;
- ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &first_ip);
- if (ret)
- return ret;
- if (tb[IPSET_ATTR_IP_TO]) {
- ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &last_ip);
- if (ret)
- return ret;
- if (first_ip > last_ip) {
- u32 tmp = first_ip;
- first_ip = last_ip;
- last_ip = tmp;
- }
- } else if (tb[IPSET_ATTR_CIDR]) {
- u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
- if (cidr >= HOST_MASK)
- return -IPSET_ERR_INVALID_CIDR;
- ip_set_mask_from_to(first_ip, last_ip, cidr);
- } else {
- return -IPSET_ERR_PROTOCOL;
- }
- elements = (u64)last_ip - first_ip + 1;
- if (elements > IPSET_BITMAP_MAX_RANGE + 1)
- return -IPSET_ERR_BITMAP_RANGE_SIZE;
- set->dsize = ip_set_elem_len(set, tb,
- sizeof(struct bitmap_ipmac_elem),
- __alignof__(struct bitmap_ipmac_elem));
- map = ip_set_alloc(sizeof(*map) + elements * set->dsize);
- if (!map)
- return -ENOMEM;
- map->memsize = bitmap_bytes(0, elements - 1);
- set->variant = &bitmap_ipmac;
- if (!init_map_ipmac(set, map, first_ip, last_ip, elements)) {
- kfree(map);
- return -ENOMEM;
- }
- if (tb[IPSET_ATTR_TIMEOUT]) {
- set->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
- bitmap_ipmac_gc_init(set, bitmap_ipmac_gc);
- }
- return 0;
- }
- static struct ip_set_type bitmap_ipmac_type = {
- .name = "bitmap:ip,mac",
- .protocol = IPSET_PROTOCOL,
- .features = IPSET_TYPE_IP | IPSET_TYPE_MAC,
- .dimension = IPSET_DIM_TWO,
- .family = NFPROTO_IPV4,
- .revision_min = IPSET_TYPE_REV_MIN,
- .revision_max = IPSET_TYPE_REV_MAX,
- .create = bitmap_ipmac_create,
- .create_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_CADT_FLAGS] = { .type = NLA_U32 },
- },
- .adt_policy = {
- [IPSET_ATTR_IP] = { .type = NLA_NESTED },
- [IPSET_ATTR_ETHER] = { .type = NLA_BINARY,
- .len = ETH_ALEN },
- [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
- bitmap_ipmac_init(void)
- {
- return ip_set_type_register(&bitmap_ipmac_type);
- }
- static void __exit
- bitmap_ipmac_fini(void)
- {
- rcu_barrier();
- ip_set_type_unregister(&bitmap_ipmac_type);
- }
- module_init(bitmap_ipmac_init);
- module_exit(bitmap_ipmac_fini);
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