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- /* 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:port type */
- #include <linux/module.h>
- #include <linux/ip.h>
- #include <linux/skbuff.h>
- #include <linux/errno.h>
- #include <linux/netlink.h>
- #include <linux/jiffies.h>
- #include <linux/timer.h>
- #include <net/netlink.h>
- #include <linux/netfilter/ipset/ip_set.h>
- #include <linux/netfilter/ipset/ip_set_bitmap.h>
- #include <linux/netfilter/ipset/ip_set_getport.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:port", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
- MODULE_ALIAS("ip_set_bitmap:port");
- #define MTYPE bitmap_port
- /* Type structure */
- struct bitmap_port {
- void *members; /* the set members */
- u16 first_port; /* host byte order, included in range */
- u16 last_port; /* 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 collection */
- unsigned char extensions[0] /* data extensions */
- __aligned(__alignof__(u64));
- };
- /* ADT structure for generic function args */
- struct bitmap_port_adt_elem {
- u16 id;
- };
- static inline u16
- port_to_id(const struct bitmap_port *m, u16 port)
- {
- return port - m->first_port;
- }
- /* Common functions */
- static inline int
- bitmap_port_do_test(const struct bitmap_port_adt_elem *e,
- const struct bitmap_port *map, size_t dsize)
- {
- return !!test_bit(e->id, map->members);
- }
- static inline int
- bitmap_port_gc_test(u16 id, const struct bitmap_port *map, size_t dsize)
- {
- return !!test_bit(id, map->members);
- }
- static inline int
- bitmap_port_do_add(const struct bitmap_port_adt_elem *e,
- struct bitmap_port *map, u32 flags, size_t dsize)
- {
- return !!test_bit(e->id, map->members);
- }
- static inline int
- bitmap_port_do_del(const struct bitmap_port_adt_elem *e,
- struct bitmap_port *map)
- {
- return !test_and_clear_bit(e->id, map->members);
- }
- static inline int
- bitmap_port_do_list(struct sk_buff *skb, const struct bitmap_port *map, u32 id,
- size_t dsize)
- {
- return nla_put_net16(skb, IPSET_ATTR_PORT,
- htons(map->first_port + id));
- }
- static inline int
- bitmap_port_do_head(struct sk_buff *skb, const struct bitmap_port *map)
- {
- return nla_put_net16(skb, IPSET_ATTR_PORT, htons(map->first_port)) ||
- nla_put_net16(skb, IPSET_ATTR_PORT_TO, htons(map->last_port));
- }
- static int
- bitmap_port_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_port *map = set->data;
- ipset_adtfn adtfn = set->variant->adt[adt];
- struct bitmap_port_adt_elem e = { .id = 0 };
- struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
- __be16 __port;
- u16 port = 0;
- if (!ip_set_get_ip_port(skb, opt->family,
- opt->flags & IPSET_DIM_ONE_SRC, &__port))
- return -EINVAL;
- port = ntohs(__port);
- if (port < map->first_port || port > map->last_port)
- return -IPSET_ERR_BITMAP_RANGE;
- e.id = port_to_id(map, port);
- return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
- }
- static int
- bitmap_port_uadt(struct ip_set *set, struct nlattr *tb[],
- enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
- {
- struct bitmap_port *map = set->data;
- ipset_adtfn adtfn = set->variant->adt[adt];
- struct bitmap_port_adt_elem e = { .id = 0 };
- struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
- u32 port; /* wraparound */
- u16 port_to;
- int ret = 0;
- if (tb[IPSET_ATTR_LINENO])
- *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
- if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
- !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO)))
- return -IPSET_ERR_PROTOCOL;
- port = ip_set_get_h16(tb[IPSET_ATTR_PORT]);
- if (port < map->first_port || port > map->last_port)
- return -IPSET_ERR_BITMAP_RANGE;
- ret = ip_set_get_extensions(set, tb, &ext);
- if (ret)
- return ret;
- if (adt == IPSET_TEST) {
- e.id = port_to_id(map, port);
- return adtfn(set, &e, &ext, &ext, flags);
- }
- 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);
- if (port < map->first_port)
- return -IPSET_ERR_BITMAP_RANGE;
- }
- } else {
- port_to = port;
- }
- if (port_to > map->last_port)
- return -IPSET_ERR_BITMAP_RANGE;
- for (; port <= port_to; port++) {
- e.id = port_to_id(map, port);
- ret = adtfn(set, &e, &ext, &ext, flags);
- if (ret && !ip_set_eexist(ret, flags))
- return ret;
- ret = 0;
- }
- return ret;
- }
- static bool
- bitmap_port_same_set(const struct ip_set *a, const struct ip_set *b)
- {
- const struct bitmap_port *x = a->data;
- const struct bitmap_port *y = b->data;
- return x->first_port == y->first_port &&
- x->last_port == y->last_port &&
- a->timeout == b->timeout &&
- a->extensions == b->extensions;
- }
- /* Plain variant */
- struct bitmap_port_elem {
- };
- #include "ip_set_bitmap_gen.h"
- /* Create bitmap:ip type of sets */
- static bool
- init_map_port(struct ip_set *set, struct bitmap_port *map,
- u16 first_port, u16 last_port)
- {
- map->members = ip_set_alloc(map->memsize);
- if (!map->members)
- return false;
- map->first_port = first_port;
- map->last_port = last_port;
- set->timeout = IPSET_NO_TIMEOUT;
- set->data = map;
- set->family = NFPROTO_UNSPEC;
- return true;
- }
- static int
- bitmap_port_create(struct net *net, struct ip_set *set, struct nlattr *tb[],
- u32 flags)
- {
- struct bitmap_port *map;
- u16 first_port, last_port;
- u32 elements;
- if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
- !ip_set_attr_netorder(tb, IPSET_ATTR_PORT_TO) ||
- !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
- !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
- return -IPSET_ERR_PROTOCOL;
- first_port = ip_set_get_h16(tb[IPSET_ATTR_PORT]);
- last_port = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
- if (first_port > last_port) {
- u16 tmp = first_port;
- first_port = last_port;
- last_port = tmp;
- }
- elements = last_port - first_port + 1;
- set->dsize = ip_set_elem_len(set, tb, 0, 0);
- map = ip_set_alloc(sizeof(*map) + elements * set->dsize);
- if (!map)
- return -ENOMEM;
- map->elements = elements;
- map->memsize = bitmap_bytes(0, map->elements);
- set->variant = &bitmap_port;
- if (!init_map_port(set, map, first_port, last_port)) {
- kfree(map);
- return -ENOMEM;
- }
- if (tb[IPSET_ATTR_TIMEOUT]) {
- set->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
- bitmap_port_gc_init(set, bitmap_port_gc);
- }
- return 0;
- }
- static struct ip_set_type bitmap_port_type = {
- .name = "bitmap:port",
- .protocol = IPSET_PROTOCOL,
- .features = IPSET_TYPE_PORT,
- .dimension = IPSET_DIM_ONE,
- .family = NFPROTO_UNSPEC,
- .revision_min = IPSET_TYPE_REV_MIN,
- .revision_max = IPSET_TYPE_REV_MAX,
- .create = bitmap_port_create,
- .create_policy = {
- [IPSET_ATTR_PORT] = { .type = NLA_U16 },
- [IPSET_ATTR_PORT_TO] = { .type = NLA_U16 },
- [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
- [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
- },
- .adt_policy = {
- [IPSET_ATTR_PORT] = { .type = NLA_U16 },
- [IPSET_ATTR_PORT_TO] = { .type = NLA_U16 },
- [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_port_init(void)
- {
- return ip_set_type_register(&bitmap_port_type);
- }
- static void __exit
- bitmap_port_fini(void)
- {
- rcu_barrier();
- ip_set_type_unregister(&bitmap_port_type);
- }
- module_init(bitmap_port_init);
- module_exit(bitmap_port_fini);
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